JP6704266B2 - Tunnel widening method - Google Patents

Description

The present invention relates to a tunnel widening method capable of widening the circumference of a tunnel.

A tunnel widening method is known in which a tunnel is widened laterally to construct a wide tunnel having a laterally long cross section (see, for example, Patent Document 1).

JP, 2010-77605, A

However, with the above-described tunnel widening method, it is possible to construct a widening tunnel with a laterally long cross section, but it has not been possible to construct a widening tunnel with a relatively large diameter that widens the circumference of the tunnel.
In view of the above problems, the present invention provides a tunnel widening method capable of widening the circumference of a tunnel and constructing a widening tunnel having a relatively large diameter.

The tunnel widening method according to claim 1 of the present invention comprises a starting base construction step for constructing a starting base outside the tunnel, a lining construction step for constructing a lining extending along the circumferential direction of the tunnel from the starting base, and a tunnel. After the excavation of the ground between the lining and the lining, by disassembling the tunnel portion surrounded by the lining, widening step for widening the tunnel, and, the lining, the pipe is installed in the ground, constructed , In the starting base construction step, after constructing the outer shell of the starting base that starts from the tunnel and reaches the tunnel, the starting base is constructed by excavating the ground between the outer shell and the outer peripheral surface of the tunnel. Since the outer shell is constructed by installing the pipe in the ground, it is possible to widen the circumference of the tunnel and construct a wide tunnel with a relatively large diameter, and to construct multiple starting bases. It is possible to build in parallel, and the construction period can be shortened .
The tunnel widening method according to claim 2 of the present invention comprises a starting base construction step of constructing a starting base on the outside of the tunnel, and a tunnel construction step of constructing a tunnel extending from the starting base along the extension direction of the tunnel. , A lining construction step for constructing a lining extending along the circumferential direction of the tunnel from the tunnel, and after excavating the ground between the tunnel and the lining, dismantling the tunnel part surrounded by the lining, And a widening step for widening, the lining is constructed by installing the pipe in the ground, and in the starting base construction step, after constructing the outer shell of the starting base that starts from the tunnel and reaches the tunnel, The starting base is constructed by excavating the ground between the outer shell and the outer circumferential surface of the tunnel, and the outer shell is characterized by being constructed by installing a pipe in the ground, so It will be possible to widen and build a wide tunnel with a relatively large diameter, and it will be possible to construct multiple starting bases in parallel, which will shorten the construction period .
The tunnel widening method according to claim 3 of the present invention comprises a starting base construction step for constructing a starting base outside the tunnel, a lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel, and a tunnel. After the excavation of the ground between the lining and the lining, by disassembling the tunnel portion surrounded by the lining, widening step for widening the tunnel, and, the lining, the pipe is installed in the ground, constructed, The tunnels are a first tunnel and a second tunnel for branching and merging. In the starting base construction step, the starting base is constructed outside at least one of the first tunnel and the second tunnel. The lining construction step is characterized in that a lining extending along the circumferential direction of the first tunnel and the second tunnel, which is a branching and joining portion of the first tunnel and the second tunnel, is constructed. , It becomes possible to widen the circumference of the tunnel and to build a widened tunnel having a relatively large diameter, and to build a large-section tunnel branching and joining part.
The tunnel widening method according to claim 4 of the present invention comprises a starting base construction step of constructing a starting base outside the tunnel, and a tunnel digging step of constructing a tunnel extending from the starting base along the extension direction of the tunnel. , A lining construction step for constructing a lining extending along the circumferential direction of the tunnel from the tunnel, and after excavating the ground between the tunnel and the lining, dismantling the tunnel part surrounded by the lining, A widening step of widening, the lining is constructed by installing a pipe in the ground, the tunnel is a first tunnel and a second tunnel for branching and joining, and in the starting base construction step, The starting base is constructed outside at least one of the first tunnel and the second tunnel, and in the lining construction step, the first tunnel serving as a branching and joining part of the first tunnel and the second tunnel. Also, since the lining that extends along the circumferential direction of the second tunnel is constructed, it becomes possible to widen the circumference of the tunnel and to construct a widened tunnel having a relatively large diameter, and a tunnel with a large cross section. It becomes possible to construct a branching and merging section.
A tunnel widening method according to a fifth aspect of the present invention is the tunnel widening method according to the third or the fourth aspect, wherein in the lining construction step, a lining extending along the circumferential direction of the first tunnel and a second tunnel and a first tunnel. Since the lining that extends along the circumferential direction of the first tunnel is constructed so as to be continuous in the extension direction of the tunnel, it is possible to widen the circumference of the tunnel and build a wide tunnel with a relatively large diameter, and It will be possible to construct a tunnel branching/merging part of the cross section.
The tunnel widening method according to claim 6 of the present invention comprises a starting base construction step for constructing a starting base outside the tunnel, a lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel, and the tunnel. After the excavation of the ground between the lining and the lining, by disassembling the tunnel portion surrounded by the lining, widening step for widening the tunnel, and, the lining, the pipe is installed in the ground, constructed, Since the end portion of the tunnel different from the tunnel is connected to the inside of the lining constructed in the lining construction step, the circumference of the tunnel can be widened and a widened tunnel having a relatively large diameter can be constructed. As a result, it becomes possible to construct a large-diameter tunnel junction.
The tunnel widening method according to claim 7 of the present invention comprises a starting base construction step of constructing a starting base outside the tunnel, and a tunnel digging step of constructing a tunnel extending from the starting base along the extension direction of the tunnel. , A lining construction step for constructing a lining extending from the tunnel along the circumferential direction of the tunnel, and by excavating the ground between the tunnel and the lining and then dismantling the tunnel part surrounded by the lining, the tunnel is constructed. A widening step for widening, the lining is constructed by installing a pipe in the ground, and the end of a tunnel different from the tunnel is connected to the inside of the lining constructed in the lining construction step. Since it is possible to widen the circumference of the tunnel, it is possible to construct a widened tunnel having a relatively large diameter, and it is also possible to construct a tunnel branching and joining portion having a large cross section.
The tunnel widening method according to claim 8 of the present invention comprises a starting base construction step for constructing a starting base outside the tunnel, a lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel, and a tunnel. After the excavation of the ground between the lining and the lining, by disassembling the tunnel portion surrounded by the lining, widening step for widening the tunnel, and, the lining, the pipe is installed in the ground, constructed, As the pipe, a pipe having a quadrangular cross-section and a trapezoidal side wall is used, and the lining is installed in the ground by connecting a plurality of the pipes in sequence to each other in the front and rear. It is characterized by the fact that the traveling path in the was constructed by a bent pipe that is linear at the connection between the rear opening edge of the front pipe and the front opening edge of the rear pipe. can be made to be able to build a relatively widened tunnel large diameter, further, to be able to build a stable arched Rainin grayed, with safe to work, it is possible to shorten the construction period, also The pipe manufacturing cost can be reduced and the construction cost can be suppressed.
The tunnel widening method according to claim 9 of the present invention comprises a starting base construction step for constructing a starting base outside the tunnel, and a tunnel digging step for constructing a tunnel extending from the starting base along the extension direction of the tunnel. , A lining construction step for constructing a lining extending along the circumferential direction of the tunnel from the tunnel, and after excavating the ground between the tunnel and the lining, dismantling the tunnel part surrounded by the lining, And a widening step of widening, the lining is constructed by installing the pipe in the ground, the pipe having a square cross section and a trapezoidal side wall is used as the pipe, and the lining is , The plurality of pipes are sequentially connected in the front and back to be installed in the ground, so that the trajectory of movement in the ground is at the connecting portion between the rear opening edge of the front tube and the front opening edge of the rear tube. It is characterized by being constructed with a bent pipe that becomes a bent line, so that it is possible to widen the circumference of the tunnel and construct a wide tunnel with a relatively large diameter, and further construct a stable arched lining As a result, the work can be performed safely, the construction period can be shortened, the manufacturing cost of the pipe can be reduced, and the construction cost can be suppressed.

The figure which shows a tunnel branch merge part construction section. Explanatory drawing of a starting base construction step. Explanatory drawing of a tunnel construction step. Explanatory drawing of a lining construction step. Explanatory drawing of a lining construction step. Explanatory drawing of a widening step. Explanatory drawing of the inner construction of a branch merge part. Sectional drawing of a pipe installation apparatus (Embodiment 1 of a pipe installation apparatus). The perspective view which showed the head part of the head tube (Embodiment 1 of a tube installation apparatus). The figure which looked at the excavation machine inside the pipe from the cutting edge side of the guide blade pipe (Embodiment 1 of the pipe installation device). The figure which shows the installation method of the pipe in the ground (Embodiment 1 of a pipe installation apparatus). The perspective view which shows a pipe installation apparatus (Embodiment 1 of a pipe installation apparatus). The disassembled perspective view which shows a pipe installation apparatus (Embodiment 1 of a pipe installation apparatus). The disassembled perspective view which shows a pipe installation apparatus (Embodiment 5 of a pipe installation apparatus). The perspective view which shows a pipe installation apparatus (Embodiment 5 of a pipe installation apparatus). The perspective view which shows a pipe installation apparatus (Embodiment 5 of a pipe installation apparatus). Sectional drawing which shows the pipe installation apparatus provided with the rocking machine rocking drive device (Embodiment 6 of a pipe installation apparatus). (A) is a perspective view showing a head portion of a head pipe, and (b) is a sectional view showing a relationship between a pair of second drilling bit groups (Embodiment 7 of the pipe installing device). (A) is a figure which shows the state at the time of excavation of a rotary excavation body, (b) is a figure which shows the attitude state at the time of collection of a rotary excavation body (Embodiment 7 of a pipe installation apparatus). The perspective view which shows the pipe|tube with which the side wall was formed in trapezoid (pipe Embodiment 1). The figure which shows the installation method of the pipe in the ground (Embodiment 1 of a pipe). The perspective view which shows the tube in which the side wall was formed in trapezoid (pipe Embodiment 2). The figure which shows the installation method of the pipe in the ground (Embodiment 2 of a pipe). The perspective view which shows a pipe division body (Embodiment 4 of a pipe). The perspective view which shows the pipe|tube comprised by connecting the pipe division body (pipe Embodiment 4).

Embodiment 1
The tunnel widening method according to the first embodiment includes a starting base construction step, a lining construction step, and a widening step.

In the starting base construction step, one starting base is constructed outside the existing tunnel, or a plurality of starting bases are constructed outside the existing tunnel at intervals along the circumference of the tunnel.
The starting base is constructed by constructing an outer shell of the starting base that starts from the tunnel and reaches the tunnel, and then excavates the ground between the outer shell and the outer peripheral surface of the tunnel (see FIG. 2 ).
The outer shell is constructed by installing a pipe in the ground. For example, using a pipe installation device 1 as will be described later, a pipe 2 (see FIGS. 20, 22, and 25) having a square cross section and a trapezoidal side wall is formed inside one tunnel. From the ground to the ground, and by connecting the succeeding pipe 2 behind the pipe 2 in sequence, the train starts from one tunnel and reaches the one tunnel continuously. A bent pipe 200 (see FIGS. 21 and 23) that is an arc-shaped continuous pipe to be installed is constructed. As will be described later, the bent pipe 200 has a plurality of the pipes 2 sequentially connected to each other in the front and rear and is installed in the ground, so that a traveling locus in the ground has a rear end opening edge of the front pipe 2. And a linear portion that bends at the connecting portion between the front end opening edge of the rear pipe 2 and the rear end. An outer shell is constructed by arranging a plurality of such bent pipes 200 so as to be adjacent to each other in the direction along the center line of the tunnel (extending direction of the tunnel). In this case, the work is performed while the ground is improved by injecting, for example, a chemical solution into the ground between the bent pipes 200, 200 adjacent to each other. If the ground is stable, it is not necessary to improve the ground.
According to the starting base construction step, it suffices to form the starting port and the reaching port of the pipe that forms the outer shell in the existing tunnel, and it is easy to perform without making any special modification work to the existing tunnel. A start base can be constructed.

In the lining construction step, a lining surrounding the circumference of the tunnel is constructed from the starting base. In the lining construction step, for example, the lining is constructed so as to start from one starting base and surround the perimeter of the tunnel to reach the one starting base, or to be adjacent to each other in the circumferential direction of the tunnel. The lining that surrounds the perimeter of the tunnel is constructed by connecting the multiple starting bases. The lining is constructed by providing a plurality of the bent pipes 200 so as to be adjacent to each other in the direction along the center line of the tunnel, as in the case of constructing the outer shell of the starting base.
According to the lining construction step, since the bent pipes 200 are provided in a plurality of rows so as to be adjacent to each other in the direction along the center line of the tunnel, a stable arch-shaped lining can be reliably constructed.

In the widening step, the tunnel is widened by excavating the ground between the tunnel and the lining constructed so as to surround the tunnel and then dismantling the tunnel portion surrounded by the lining (Fig. 6). reference).

According to the tunnel widening method according to the first embodiment, the circumference of the tunnel can be widened and a widening tunnel having a relatively large diameter can be constructed without constructing a tunnel constructed in the tunnel widening method according to the second embodiment described later. Become.
In addition, in the starting base construction step, a plurality of starting bases are constructed at intervals along the circumference of the tunnel, and in the lining construction step, the plurality of starting bases constructed so as to be adjacent to each other in the circumferential direction of the tunnel are connected. The lining is constructed as described above, and if multiple starting bases and multiple linings are constructed by installing pipes in the ground, the work of constructing multiple starting bases at intervals along the circumference of the tunnel. In addition, it is possible to perform the lining construction work that connects the starting bases that were constructed so as to be adjacent to each other on the circumference surrounding the tunnel, in parallel at multiple locations on the circumference. Therefore, the construction period can be shortened.

Embodiment 2
The tunnel widening method according to the second embodiment includes a starting base construction step, a tunnel construction step, a lining construction step, and a widening step.

The starting base construction step is the same as the starting base construction step described in the first embodiment (see FIG. 2).

In the tunnel construction step, a tunnel extending from the starting base along the extension direction of the tunnel is constructed.
In the tunnel construction step, for example, by launching the shield machine from one starting base, one tunnel (steel shield) is constructed, or from within a plurality of starting bases, shield machines are paralleled in parallel. By starting the vehicle, a plurality of tunnels (tunnel shields) provided at locations spaced in the circumferential direction of the tunnel are constructed (see FIG. 3 ).
According to the tunnel construction step, the tunnel can be easily constructed from the starting base along the extension direction of the tunnel in a straight line. That is, a method of constructing a tunnel along the extension direction of the tunnel by starting the shield machine from the tunnel is also conceivable, but in such a method, a special shield machine such as a curved shield machine is required, and the cost is reduced. And there is a problem in terms of construction period. On the other hand, in the second embodiment of the present invention, since the guide shaft can be constructed by using a general shield machine, the cost can be reduced and the construction period can be shortened.

In the lining construction step, for example, the lining is constructed so as to start from one tunnel and surround the circumference of the tunnel to reach the one tunnel, or to be constructed adjacent to each other in the circumferential direction of the tunnel. A lining surrounding the tunnel is constructed by connecting multiple tunnels (see Fig. 5). The lining is constructed by providing the above-mentioned bent pipes 200 in a plurality of rows so as to be adjacent to each other in the direction along the center line of the tunnel, as in the lining construction step described in the first embodiment.

In the widening step, the tunnel between the tunnel and the lining constructed so as to surround the tunnel is excavated, and then the tunnel portion surrounded by the lining is disassembled to widen the tunnel (Fig. 6). reference).

According to the tunnel widening method of the second embodiment, it is possible to widen the circumference of the tunnel and construct a widening tunnel having a relatively large diameter.
In addition, in the starting base construction step, a plurality of starting bases are constructed at intervals along the circumference of the tunnel, and in the tunnel construction step, by constructing a tunnel from each of the plurality of starting bases, Construct a plurality of tunnels at intervals in the circumferential direction, and in the lining construction step, construct a lining so as to connect the tunnels that are constructed so as to be adjacent to each other in the circumferential direction of the tunnel. The lining will be constructed by installing pipes in the ground and using multiple shields to construct multiple starters, with multiple starting stations spaced around the circumference of the tunnel. It is possible to do the work in parallel, it is possible to perform the work to build multiple tunnels in parallel, and further, between the tunnels constructed adjacent to each other on the circumference surrounding the tunnel. Since the lining construction work for connecting can be performed in parallel at a plurality of locations on the circumference, the construction period can be shortened.
In addition, for example, one starting base that extends along the circumference of the tunnel is constructed, a plurality of tunnels are constructed at intervals from the one starting base in the circumferential direction of the tunnel, and the lining construction step is performed. In, the lining may be constructed so as to connect between the tunnels constructed so as to be adjacent to each other in the circumferential direction of the tunnel.

Embodiment 3
In the starting base construction step in Embodiments 1 and 2, when the starting bases constructed so as to be adjacent to each other along the circumference of the tunnel are not constructed at positions displaced from each other along the extension direction of the tunnel, At a position on the same circumference of the tunnel where multiple starting bases are provided so as to be adjacent to each other along the circumference, the ground excavated between the outer shell and the outer peripheral surface of the tunnel is taken into the tunnel, or the starting base Since it is necessary to form an opening for carrying in the shield machine inside, there are many defective portions at positions on the same circumference of the tunnel, which may reduce the strength of the tunnel. Therefore, in the starting base construction step in Embodiments 1 and 2, by constructing the starting bases adjacent to each other along the circumference of the tunnel at positions displaced from each other along the extension direction of the tunnel, the defective portion of the tunnel is Since it shifts in the direction along the extension direction of, it becomes possible to suppress the decrease in the strength of the tunnel. In other words, by constructing each of the starting bases so that the centers (centers of gravity) of the adjacent starting bases along the circumference of the tunnel are displaced from each other in the direction along the extension direction of the tunnel, the strength of the tunnel is increased. It becomes possible to suppress the reduction.

Embodiment 4
In the lining construction step in the first and second embodiments, a plurality of construction areas are set along the extension direction of the tunnel, and the pipe installation work is performed in parallel in two or more construction areas. Since the installation work can be performed in parallel and the construction period required for the lining construction step can be shortened, the construction period can be shortened.

Embodiment 5
Next, using the tunnel widening method described in Embodiments 1 to 4, for example, a method of constructing a branching and joining portion of a main tunnel as a first tunnel and a ramp tunnel as a second tunnel will be described. A specific description will be given with reference to FIGS.

As shown in FIG. 1, the method of constructing the branch merge part between the main line tunnel and the ramp tunnel by using the above-described tunnel widening method is as follows: in the branch merge part construction section X between the main line tunnel A1 and the ramp tunnel A2. By constructing a lining D surrounding the tunnel A1 and the ramp tunnel A2, and excavating the ground between the lining D and the main tunnel A1 and the ground between the lining D and the ramp tunnel A2, This is a method for constructing a branching junction G (see FIGS. 6 and 7) of a cross section, and a branching junction utilizing the above-described starting base construction step, guideway construction step, lining construction step, and the widening step described above. And a construction step.
The main line tunnel A1 and the ramp tunnel A2 are, for example, shield tunnels constructed underground in an urban area.

The starting base construction step is a step of constructing the starting base B of the tunnel C outside the main line tunnel A1.
In the starting base construction step, a plurality of starting bases B, B... Are constructed at a plurality of locations at intervals along the circumference of the main line tunnel A1.
As shown in FIG. 2, for example, four starting bases B are arranged so that the centers of the starting bases B, B... Are located 90 degrees apart from each other on the circumference centered on the center line of the main tunnel A1. Be built.
The starting base B constructs the outer shell B1 of the starting base B that starts from the main line tunnel A1 and reaches the main line tunnel A1, and then excavates the ground between the outer shell B1 and the outer peripheral surface of the main line tunnel A1. To construct.
In this case, the starting bases B and B adjacent to each other along the circumference of the tunnel are constructed at positions displaced from each other along the extension direction of the main tunnel A1 to prevent the strength of the main tunnel A1 from decreasing. That is, by constructing the respective starting bases so that the centers (centers of gravity) of the starting bases B and B adjacent to each other along the circumference of the tunnel are displaced from each other in the direction along the extension direction of the tunnel, It is suppressed that the strength of A1 becomes small.

The outer shell B1 is constructed by installing a pipe in the ground. For example, the outer shell B1 is constructed by arranging a plurality of the bent tubes 200 described above so as to be adjacent to each other in the direction along the center line of the main tunnel A1 (the extension direction of the main tunnel A1). In this case, the work is performed while the ground is improved by injecting, for example, a chemical solution into the ground between the bent pipes 200, 200 adjacent to each other. If the ground is stable, it is not necessary to improve the ground.
Then, the segment of the main tunnel A1 located inside the outer shell B1 constructed is disassembled to form an opening B2 (see FIG. 2) for taking in the earth and sand inside the outer shell B1 into the main tunnel A1. By excavating the ground between the outer shell B1 and the main tunnel A1 through the opening B2, taking it into the main tunnel A1, and then discharging it to the ground, the base space between the outer shell B1 and the main tunnel A1. To form a starting base B covered with the outer shell B1 between the outer shell B1 and the main line tunnel A1.
In this way, a plurality of bent tubes 200, 200... Are provided in a plurality of rows so as to be adjacent to each other in the direction along the center line of the main line tunnel A1, and the outer shell B1 is constructed, whereby a stable arch-shaped outer shell is provided. B1 can be constructed.
In addition, a plurality of outer shells B1, B1... for constructing a plurality of starting bases B, B... Located at intervals on the circumference centered on the center line of the main line tunnel A1 are provided with a pipe installation device described later. If a plurality of starting bases B, B... Are constructed in parallel by using a plurality of 1's, the construction period can be shortened.

As shown in FIG. 3, the guide pit construction step extends from the starting base B toward the ramp tunnel A2 side over the branch merging portion construction section X of the main line tunnel A1 and the ramp tunnel A2. This is the step of constructing pit C.
In the guideway construction step, for example, a shield machine (not shown) is carried into each of the plurality of starting bases B, B... through the opening B2 to be assembled, and the opening B2 is closed by a reinforcing material (not shown). By starting shield machines in parallel from inside the starting bases B, B..., extending outside the main tunnel A1 and ramp tunnel A2 along the extension direction of the main tunnel A1 and ramp tunnel A2, and A plurality of tunnels C are provided at locations spaced apart in the circumferential direction of the main tunnel A1.
If the tunnel C is constructed by the shield machine, the tunnel C can be constructed without being affected by the geology, for example, in the underground of the urban area so as not to adversely affect the surrounding environment.
Moreover, since a plurality of tunnels C can be constructed in parallel, the construction period can be shortened.

As shown in FIG. 1, the branching and joining section construction section X includes a parallel portion X1 that is a portion along the parallel main tunnel A1 and a ramp tunnel A2, and a single portion X2 that is a portion along the main tunnel A1. is there.
As shown in FIG. 1, a plurality of tunnels C are constructed so as to extend outside the main tunnel A1 and the ramp tunnel A2 along the extension direction of the main tunnel A1 and the ramp tunnel A2 in the parallel portion X1. The portion X2 is constructed to extend outside the main tunnel A1 along the extension direction of the main tunnel A1 and the extension direction of the ramp tunnel A2.

In the lining construction step, as shown in FIG. 1, a lining D surrounding the main tunnel A1 from the tunnel C is constructed in the single portion X2 over the branch confluence construction section X of the main tunnel A1 and the ramp tunnel A2. And the step of constructing the lining D surrounding the main tunnel A1 and the ramp tunnel A2 from the tunnel C in the parallel portion X1.
In the lining construction step, as shown in FIG. 1 and FIG. 5, the start is performed so as to connect the two tunnels C, C provided adjacent to each other on the circumference surrounding the main line tunnel A1 between the individual portions X2. By installing the bent pipe 200 similar to the bent pipe 200 constructed in the base construction step in the ground, the lining D surrounding the main line tunnel A1 is constructed between the single portions X2.
In addition, as shown in FIG. 1, the starting base construction is performed so as to connect the two tunnels C, C provided adjacent to each other on the circumference surrounding the main tunnel A1 and the ramp tunnel A2 between the parallel portions X1. By installing the bent pipe 200 similar to the bent pipe 200 constructed in the step in the ground, a lining D surrounding the main tunnel A1 and the ramp tunnel A2 is constructed between the parallel portions X1.
That is, in the lining construction step, a lining extending along the circumferential direction of the main tunnel A1 and the ramp tunnel A2, which is a branching and joining portion of the main tunnel A1 and the ramp tunnel A2, is constructed.
In this way, a plurality of bent tubes 200, 200... Are provided in a plurality of rows so as to be adjacent to each other in the direction along the circumferential direction of the main tunnel A1 and the ramp tunnel A2 to construct the lining D, thereby forming a stable arch shape. Lining D can be constructed.
Further, a lining construction work for connecting between the tunnels C, C provided so as to be adjacent to each other on the circumference surrounding the main tunnel A1, or provided so as to be adjacent on the circumference surrounding the main tunnel A1 and the ramp tunnel A2. Since it is possible to perform the lining construction work for connecting the guide shafts C, C in parallel at a plurality of locations on the circumference, the construction period can be shortened.

Further, in the lining construction step, the work of installing the bent pipe 200 connecting the two tunnels C and C in the ground is performed along the extension direction of the main tunnel A1 and the ramp tunnel A2 as shown in FIG. By setting a plurality of construction areas D1, D2... And installing the bent pipes 200 in the ground in two or more construction areas D1, D2... In parallel, the installation work of the bent pipes 200 is performed in parallel. Since it becomes possible to shorten the construction period for the lining construction step, the construction period can be shortened.

As shown in FIG. 6, the branching and joining section construction step is to excavate the ground E1 between the main line tunnel A1 and the lining D that surrounds the main line tunnel A1 and then dig the main line tunnel A1 portion surrounded by the lining D. After dismantling and excavating the ground E1 between the main line tunnel A1 and the ramp tunnel A2 and the lining D surrounding the main line tunnel A1 and the ramp tunnel A2, the main line tunnel A1 portion and the ramp tunnel surrounded by the lining D This is a step of constructing a branching and joining portion G of the main tunnel A1 and the ramp tunnel A2 by disassembling the A2 portion.
In the work of excavating the ground, as shown in FIG. 6, a through hole (not shown) is formed in the bent pipe 200 for constructing the lining D, and the ground E1 is excavated through the through hole to bend the bent pipe 200. After being taken in, it is discharged to the ground via the tunnel C, so that between the main line tunnel A1 and the lining D surrounding the main line tunnel A1, and further between the main line tunnel A1 and the ramp tunnel A2. A cavity E is formed between the main line tunnel A1 and the ramp tunnel A2 and a lining D surrounding the perimeter.
Then, the segment of the main tunnel A1 and the segment of the ramp tunnel A2 located inside the cavity E are disassembled from the inside of the tunnel to construct a branching and merging portion G of the main tunnel A1 and the ramp tunnel A2 ( 6(b) and 6(c)).
After constructing the branching and joining part G, the inner space of the outer shell B1 (inside the starting base B) and the inner space of the tunnel C except for the space E are filled with concrete or the like.

Then, as shown in FIG. 7( a ), the floor slab I of the branching and joining part is constructed as shown in FIG. 7( b) by backfilling the earth and sand H inside the branching and joining part G or by placing concrete. To do. Then, a fireproof panel (not shown) is attached to the inner wall surface of the branching and joining portion G (the inner surface of the lining D).

According to the fifth embodiment, since the lining D surrounding the main tunnel A1 and the lining D surrounding the main tunnel A1 and the ramp tunnel A2 are constructed, the periphery of the main tunnel A1 can be widened and It is possible to widen the circumference of the main line tunnel A1 and the ramp tunnel A2, and to construct a large-section tunnel branching and joining portion.
Further, since the outer shell B1 and the lining D are constructed by the plurality of bent tubes 200, 200..., It becomes possible to construct the stable arch-shaped outer shell B1 and the stable arch-shaped lining D. The work can be performed safely and the construction period can be shortened.
Further, since the bent pipe 200 is constructed by using the pipe 2 having a square cross section and the side wall formed in a trapezoidal shape, the manufacturing cost of the pipe 2 can be reduced and the construction cost can be suppressed. Is possible.

Embodiment 6
In the fifth embodiment, an example in which the lining D that surrounds the main tunnel A1 and the lining D that surrounds the main tunnel A1 and the lamp tunnel A2 are constructed after the end of the ramp tunnel A2 reaches the main tunnel A1. However, after constructing the lining D surrounding the main line tunnel A1, the end of the ramp tunnel A2 (another tunnel) may be connected to the inside of the lining D.
For example, a lining D surrounding the main line tunnel A1 is constructed in a section which becomes the single portion X2 of the branch merge section construction section X, and the ground between the main line tunnel A1 and the lining D surrounding the main line tunnel A1 is excavated. After that, the main line tunnel portion surrounded by the lining D is disassembled to widen the main line tunnel A1 in the single portion X2. Then, after connecting the end of the ramp tunnel A2 to the inside of the lining D in the widened main tunnel A1, a lining D surrounding the main tunnel A1 and the ramp tunnel A2 in the section that is the parallel portion X1 is constructed. Then, the ground between the lining D and the main tunnel A1 and the ramp tunnel A2 is excavated, and the segment of the main tunnel A1 and the segment of the ramp tunnel A2 located inside the lining D are disassembled from the inside of the tunnel. By doing so, a branching and merging portion G of the main tunnel A1 and the ramp tunnel A2 may be constructed.
Moreover, after constructing the lining D surrounding the main tunnel A1 in the section which becomes the single section X2 of the branch merge section construction section X and connecting the end of the ramp tunnel A2 inside the lining D, the parallel section X1 is formed. In the section, the lining D surrounding the main line tunnel A1 and the ramp tunnel A2 is constructed, and then the ground between the lining D and the main line tunnel A1 and the ramp tunnel A2 is excavated over the branch merge section construction section X, In addition, by disassembling the segment of the main tunnel A1 and the segment of the ramp tunnel A2 located inside the lining D from the inside of the tunnel, a branching and joining portion G of the main tunnel A1 and the ramp tunnel A2 is constructed. You may.
In addition, after widening the main tunnel A1 in the single portion X2, the end of the ramp tunnel A2 is connected to the inside of the lining D in the widened main tunnel A1, or the circumference of the main tunnel A1 is surrounded in the section that becomes the single portion X2. After constructing the surrounding lining D and connecting the end of the ramp tunnel A2 to the inside of the lining D, by expanding the main line tunnel A1 in the single portion X2, the main line tunnel A1 in which only the single portion X2 is widened is formed. You may make it construct|assemble the branch junction part G with the ramp tunnel A2. In other words, the lining D that surrounds the main tunnel A1 and the ramp tunnel A2 in the section that is the parallel portion X1 is not constructed, but the widened single portion X2 of the main tunnel A1 and the end of the ramp tunnel A2 are connected. The branching/merging portion G may be constructed.
According to the sixth embodiment, the circumference of the main line tunnel A1 can be widened, and a tunnel branching/merging portion having a large cross section can be constructed.

In addition, in each of the above-described embodiments, a curved tube having a curved center line may be used as the tube having a rectangular cross section for constructing the outer shell.
In addition, as a pipe with a rectangular cross section for constructing the lining, a curved pipe whose center line is a curve, or a pipe which extends straight (a pipe whose center line is a straight line (straight pipe)) You may use it.
Alternatively, a tube having a circular cross section may be used as the tube. For example, a curved pipe having a circular cross section called a pipe roof may be installed by using a dedicated pipe installation device.

Further, the tunnel C may be constructed by a mountain construction method such as a TBM method, mechanical excavation, blasting, a sheet pile method, and a NATM method.
In the case of constructing only one tunnel C, the lining D that starts from the tunnel C and reaches the tunnel C is formed by using a pipe 2 having a trapezoidal side wall or a curved pipe. You can build it.

Further, in the embodiment, the starting base is constructed outside the first tunnel, but the starting base may be constructed outside the second tunnel, or outside the first tunnel and outside the second tunnel. You may build a starting base in both. That is, in the starting base construction step, the starting base may be constructed outside at least one of the first tunnel and the second tunnel.
Further, the starting base may use a vertical shaft provided so as to reach from the ground to the vicinity of the tunnel.

Further, in the embodiment, in the lining construction step, the example in which the lining is constructed so as to surround the circumference of the tunnel from the starting base or tunnel is shown, but the lining extending from the starting base or tunnel along the circumferential direction of the tunnel. May be constructed. For example, an arc-shaped lining extending along the circumferential direction of the tunnel from the starting base or tunnel may be constructed without surrounding the circumference of the tunnel.

INDUSTRIAL APPLICABILITY The tunnel widening method of the present invention is not only adopted when constructing a branching and merging portion, but also when widening a tunnel for expanding lanes of a highway tunnel, widening a subway tunnel, and other tunnels. It is also applicable when widening.

Embodiment 1 of tube installation device 1
Hereinafter, an example of the pipe installation device 1 for constructing the outer shell B1 or the lining D by installing a pipe having a rectangular cross section in the ground will be described with reference to FIGS. 8 to 13.
As shown in FIG. 8, the pipe installation device 1 includes a pipe 2, an excavation device 3, a propulsion device 4, a propulsion force transmission device 70, a guide 90, and a holding member 110. Hereinafter, the upper side in FIG. 8 is defined as the head or front side of the tube 2 or the tube installation apparatus 1, the lower side in FIG. 8 is defined as the rear side of the tube 2 or the tube installation apparatus 1, and the left and right sides in FIG. 8 are defined. The left and right sides of the tube 2 and the tube installation apparatus 1 are defined, and the upper and lower sides in the direction orthogonal to the paper surface of FIG. 8 are defined as the upper and lower sides of the tube 2 and the tube installation apparatus 1. In FIG. 9, the front side, the rear side, the left side, the right side, the upper side, and the lower side of the tube 2 and the tube installation device 1 are specified.

Hereinafter, the configuration of the pipe installation device 1 will be described with reference to FIGS. 8 to 10.
The leading tube 6 has a configuration in which a guide blade portion is provided on the tip side of the tube, and for example, as shown in FIG. 8, a tube 6x and a guide blade tube that functions as a guide blade portion provided at the tip of the tube 6x. 9 and 9. The guide blade tube 9 is a tube including a blade portion 14 in which one opening end edge 13 of the tube is sharply formed.
The leading tube 6 is formed by connecting the other open end of the guide blade tube 9 and the open end 8 of the tip of the tube 6x. In this case, for example, the outer diameter of the guide blade pipe 9 is larger than the outer diameter of the pipe 6x, and the inner circumference of the pipe at the opening end face 15 is closer to the other opening end face 15 side of the guide blade pipe 9. The surface side is shaved and a step is provided, so that the fitting hole 16 into which the open end 8 of the tip of the pipe 6x is fitted is formed. Then, the opening end portion 8 at the tip of the pipe 6x is fitted into the fitting hole 16 provided in the other opening portion 17 of the guide blade tube 9, and both of them are connected by bolt connection, welding, or the like (not shown). By being connected by means, the other open end of the guide blade tube 9 and the open end 8 of the tip of the tube 6x are connected. In this way, the guide blade tube 9 is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9 so that the guide blade tube 9 can move the tip open end surface 18 of the tube 6x. Since it is attached so as to cover the pipe 6x, when the pipe 6x is propelled, the tip opening end face 18 of the pipe 6x does not receive the resistance of the ground 10 and the propulsion resistance can be reduced. Further, since the fitting hole 16 into which the opening end portion 8 at the tip of the tube 6x is fitted is formed, the guide blade tube 9 can be easily installed at the tip of the tube 6x, and the leading tube 6 is formed. It is possible to easily assemble the tube 6x and the guide blade tube 9. In this case, a step is generated between the tube 6x and the guide blade tube 9 on the rectangular outer peripheral surface of the leading tube 6, but this step is provided on the rectangular outer peripheral surface of the tube 2 and the inner peripheral surface of the departure port. The maintenance member is formed small (for example, about 1 cm) so that the waterproof performance can be maintained.

The outer diameters of the guide blade tube 9 and the tube 6x have the same diameter, and the other opening end surface of the guide blade tube 9 and the tip opening end surface 18 of the tube 6x are abutted to each other, and their boundary portions are welded all around. Alternatively, the leading tube 6 may be formed by spot welding.
Further, a tube formed on the guide blade portion whose tip side functions as the guide blade tube 9 may be used as the leading tube 6.
In this way, the step on the rectangular outer peripheral surface of the leading tube 6 can be made small, or no step is generated, so that the water-tightness maintaining member provided on the rectangular outer peripheral surface of the tube 2 and the inner peripheral surface of the departure port can stop the water. Good performance can be maintained.

A pipe-side propulsion force receiving portion 21 is provided at a position on the inner surface 20 of the leading pipe 6 that is closer to the leading end than the central portion in the extension direction of the pipe (direction along the center line of the pipe). The tube-side propulsion force receiving portion 21 receives the propulsion force from the propulsion device 4 via the substrate 25 provided on the excavation device 3 described later to propel the leading pipe 6. The tube-side propulsion force receiving portion 21 is formed in a rectangular frame outer peripheral dimension corresponding to a rectangular shape that makes a round around the inner surface of the cross section of the leading tube 6 (the section when the leading tube is cut along the plane orthogonal to the center line of the leading tube). The rectangular frame body 22 is formed by the rectangular frame body 22 and the rectangular frame body 22 is installed so that the outer peripheral surface 23 of the rectangular frame body 22 and the inner peripheral surface 20a of the tube of the leading tube 6 correspond to each other. It is fixed to the inner peripheral surface 20a by welding, connecting means (not shown) such as bolts and nuts.

The excavation device 3 includes a substrate 25, an excavation machine 26, a drive source 27, a water supply mechanism 75, and a mud discharge mechanism 76.
The board 25 is arranged so that the center line of the lead tube 6 and the center line of the board 25 coincide with each other, and is provided so as to be movable in the front-rear direction in the lead tube 6. The substrate 25 is formed by a rectangular plate 30 corresponding to a rectangular shape that goes around the inner surface of the cross section of the leading tube 6. The size of the rectangular plate 30 is smaller than the size of a rectangle that goes around the inner surface of the cross section of the leading tube 6 and is smaller than the inner size of the rectangular frame of the rectangular frame body 22 that forms the tube-side propulsion force receiving portion 21. Is also big. That is, the rectangular peripheral surface 33 on the front surface 39f of the rectangular plate 30 forming the substrate 25 and the frame rear surface 32 of the rectangular frame body 22 forming the tube side propulsive force receiving portion 21 are formed to face each other. A watertight seal formed by, for example, an elastic body is provided between the rectangular peripheral surface 33 of the front surface 39f of the rectangular plate 30 forming the substrate 25 and the frame rear surface 32 of the rectangular frame body 22 forming the tube-side propulsion force receiving portion 21. A performance maintaining member (packing) 35 is provided. The watertight performance maintaining member 35 is, for example, a rectangle attached to the rectangular peripheral surface 33 on the front surface 39f of the rectangular plate 30 forming the substrate 25 or the frame rear surface 32 of the rectangular frame body 22 forming the tube-side propulsion force receiving portion 21. It is formed by the frame body 36. Therefore, the propulsive force transmitted to the substrate 25 is transmitted to the pipe side propulsive force receiving portion 21 via the watertight performance maintaining member 35, so that the pipe 2 and the excavating machine 26 are propelled together.
One end of a support portion 40 of the excavating machine 26 is fixed to the central portion of the front surface 39f of the substrate 25.
Further, a through hole 38a is formed in the central portion of the substrate 25 so that a pressure-resistant hose 56, which will be described later, penetrates.

The excavation machine 26 includes a support portion 40 and a rotating portion 41.
The support portion 40 is formed by a T-shaped hollow pillar in which one pillar 42 and two branch pillars 43 are combined. For example, a mounting flange (not shown) is provided at one end of the column 42, and the mounting flange is detachably fixed to the center of the front surface 39f of the substrate 25 by a fixture such as a bolt and a nut. One end is fixed to the center of the front surface 39f of the substrate 25, and the support column 42 extends in a direction orthogonal to the front surface 39f of the substrate 25. The two branch columns 43 extend from the tip (the other end) of the column 42 in a direction away from each other on a straight line orthogonal to the extension direction of the column 42. That is, one end of the column 42 is fixed to the substrate 25 so that the T-shaped hollow path of the support portion 40 and the through hole 38a communicate with each other. A motor mount 44 is provided at each end of the branch columns 43.

The rotating unit 41 includes a rotating mechanism unit 45 and a rotating excavation body 46.
The rotation mechanism unit 45 is composed of, for example, a motor 47. The casing 48 of the motor 47 is fixed to each of the motor mounts 44, 44.
The rotary shafts 49, 49 of the two motors 47, 47 extend in the direction away from each other on the straight line orthogonal to the extension direction of the column from the tip of the column 42.
The rotary excavation body 46 includes a casing 50 having one end open and the other end closed, and a plurality of excavation bits (excavation blades) 52 provided on the outer peripheral surface 51 of the casing 50.

As the motor 47, for example, a motor that operates by fluid pressure or a motor that operates by electricity is used. For example, when a hydraulic motor (hereinafter referred to as hydraulic motor 47) is used, the hydraulic pressure source 55 as the drive source 27 and the inside of the casing 48 of the hydraulic motor 47 form the pressure oil supply passage 56a and the oil return passage 56b. Connected by. That is, the pressure resistant hose 56 is connected to the casing 48 of the hydraulic motor 47 via the through hole 38 a and the T-shaped hollow passage of the support portion 40. The hydraulic motor 47 is configured such that the rotary shaft 49 is rotated by the pressure oil supplied into the casing 48 through the pressure resistant hose 56.

For example, the other end closed inner surface 53 of the housing 50 and the hydraulic pressure are adjusted so that the center of the other end closed inner surface (the inner bottom surface of the housing) 53 of the housing 50 of the rotary excavator 46 and the rotation center of the rotary shaft 49 coincide with each other. A connecting plate 54 provided at the tip of a rotating shaft 49 rotated by a motor 47 is connected by a connecting member 57 such as a screw.
That is, the two rotary excavation bodies 46 are configured to rotate about a single rotation center line L common to the two rotation shafts 49, 49. That is, the two rotary excavation bodies 46, 46 that rotate about the rotation center line L orthogonal to the propulsion direction of the lead tube 6 are provided. A configuration including such two rotary excavation bodies 46, 46 is called a twin header. When using a so-called twin header provided with two rotary excavation bodies 46, 46 that rotate about a rotation center line L orthogonal to the propulsion direction of the leading tube 6, a rotary excavation body 46 in a plane orthogonal to the propulsion direction is used. Since the excavation width can be increased, the pipe 2 having a rectangular width corresponding to the excavation width can be easily installed in the ground 10.

The front and rear positions of the rotary excavation bodies 46, 46 may be appropriately adjusted by changing the installation position of the pipe-side propulsive force receiving portion 21 to the front and rear.
For example, as shown in FIG. 8, the rotary excavation bodies 46, 46 are arranged such that the tip 80 of the excavation bit 52 and the cutting edge 81 of the guide blade tube 9 are located on one plane orthogonal to the central axis of the guide blade tube 9. Although not shown, the rotary drilling bodies 46, 46 are installed such that the tip 80 of the drill bit 52 projects forward of the cutting edge 81 of the guide blade tube 9, and the tip 80 of the drill bit 52 is The rotary excavation bodies 46, 46 are installed so as to be located inside the head pipe 6.

When the tip 80 of the excavating bit 52 is projected forward of the blade edge 81 of the guide blade tube 9 to perform the excavating operation of the rotary excavating bodies 46, 46, the ground located in front of the blade edge of the guide blade tube 9 is excavated. Since it is possible to reliably excavate by the bit 52, it is possible to reduce the situation in which the cutting edge 81 of the guide blade tube 9 collides with the hard ground and the leading tube 6 cannot be propelled. For example, the tip 80 of the excavation bit 52 is projected forward of the blade edge 81 of the guide blade tube 9 so that the rotation center line L and the blade edge 81 of the guide blade tube 9 are located on the same plane, and the rotary excavation body is If the excavation operation by 46, 46 is performed, the ground located in front of the cutting edge of the guide blade pipe 9 can be excavated more reliably by the excavation bit 52, and the pipe 2 can be more easily propelled. Installation work can be done more smoothly.

If the propulsion operation of the leading tube 6 and the excavation operation of the rotary excavating bodies 46, 46 are performed with the tip 80 of the excavating bit 52 positioned in the leading tube 6, the guide blade tube 9 pierced in the ground 10 Since only the underground portion that has entered the inside of the blade edge is excavated by the excavation bit 52, the excess dug portion of the underground 10 is reduced, and the influence on the underground 10 such as ground subsidence can be reduced.

A fixed excavation body 77 is provided between the rotary excavation bodies 46, 46.
The fixed excavation body 77 is fixedly attached to the front outer peripheral surface of the boundary portion between the two branch columns 43, 43 by welding or fixing means such as bolts and nuts so as to project forward from the branch column 43.
The fixed excavation body 77 is, for example, formed in a curved shape in which the central portion between the upper and lower sides bulges toward the cutting edge 81 side of the guide blade tube 9, and the center between the left and right widths of this curved surface is along the circumferential direction of the curved surface. It is configured to have a continuous sharp edge shape.
In this way, the fixed excavation body 77 has a configuration in which the upper and lower central portions are formed in a curved shape that bulges toward the cutting edge 81 side of the guide blade tube 9, so that the resistance of the ground when the leading tube 6 is propelled. Can be reduced and the leading tube 6 can be more smoothly propelled.

If the fixed excavation body 77 is not provided, the excavated earth and sand may be clogged between the rotary excavation bodies 46, 46. When the fixed excavation body 77 collides with the ground by the propulsion of the front pipe 6, the ground is scraped, and the earth and sand and rocks in the colliding ground portion are distributed to the left and right to rotate the left and right rotary excavation bodies. Since it plays a role of directing to 46, 46, the leading tube 6 can be more smoothly propelled.
For example, as shown in FIG. 8, the center between the upper and lower sides of the fixed excavation body 77, the excavation bit 52 of the rotary excavation body 46, and the cutting edge 81 of the guide blade tube 9 are on the same plane orthogonal to the central axis of the leading tube 6. Configured to be located.
Thus, the center between the upper and lower sides of the fixed excavation body 77, the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9 are located on the same plane orthogonal to the central axis of the leading tube 6. In this case, as described above, the fixed excavation body 77 can easily excavate by inducing cracks in the ground prior to excavation, and at the same time, the fixed excavation body 77 collides with the ground and leads the front pipe. It is possible to prevent 6 from not promoting.

The center between the upper and lower sides of the fixed excavation body 77 may be located behind or in front of the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9.
When the center between the upper and lower sides of the fixed excavation body 77 is located in front of the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9, the fixed excavation body 77 is placed on the ground before excavation. Inducing cracks also has the effect of facilitating excavation.
On the contrary, in the case where the center between the upper and lower sides of the fixed excavation body 77 is located behind the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9, excavation is performed when the ground is hard. It is possible to prevent the fixed excavation body 77 from colliding with the ground before the bit 52 and the cutting edge 81 of the guide blade tube 9 and the leading tube 6 not propelling.

In addition, the tip shape of the fixed excavation body 77 is such that the ground is scraped by colliding with the ground by the propulsion of the leading pipe 6, and the earth and sand or rock in the colliding ground portion are distributed to the left and right, and the left and right rotary excavation bodies 46, It may be formed in a shape capable of achieving the role of directing to No. 46 or inducing a crack in the ground before excavation to facilitate excavation. For example, as described above, the front tip may be formed in a sharp cutting edge shape, or the front tip may be formed in a planar shape, and the shape of which is likely to be excavated and broken due to the geology of the ground. Should be selected.

Further, since the housing 50 of the rotary excavation body 46 is installed apart from the left and right inner surfaces of the guide blade tube 9 so as not to come into contact with the left and right inner surfaces of the guide blade tube 9, the left and right of the housing 50 and the guide blade tube 9 are installed. It may be difficult to excavate the ground between the inner surface and the inner surface.
Therefore, the drill bit 52 located on the center side of the leading pipe 6 is provided so as to extend in the direction orthogonal to the central axis (rotation center line L) of the housing 50, and as shown in FIGS. 8 to 10. , The drill bit 52a (52) located on the left side of the leading pipe 6 is extended to the left side of the leading pipe 6 to a position as close to the left inner surface of the guide blade pipe 9 as possible, and further located on the right side of the leading pipe 6. The drilling bit 52b (52) located on the left and right sides of the leading pipe 6 is provided by extending the drilling bit 52b (52) to the right of the guide blade pipe 9 to the position as close as possible to the right inner surface of the guiding blade pipe 9. The ground located at the left and right corners of the head pipe 6 can be excavated more effectively.

The water supply mechanism 75 includes a water storage tank 75a, a water supply hole 75b penetrating the front surface 39f and the rear surface 39 of the substrate 25, a water supply pipe 75c formed of, for example, a bellows pipe or a steel pipe, and a water supply pump. 75d and a connecting pipe 75e.
For example, one end of the water supply pipe 75c is inside the water supply hole 75b so that the one end opening of the water supply pipe 75c communicates with the space 69 surrounded by the front surface 39f of the substrate 25 and the inner surface 20 of the leading pipe 6. The water supply hole 75b and one end of the water supply pipe 75c are joined by screwing. Then, the other end opening of the water supply pipe 75c and the discharge port of the water supply pump 75d are communicably connected, and the suction port of the water supply pump 75d and the water storage tank 75a are communicatively connected by the connection pipe 75e. To be done.

The sludge discharging mechanism 76 includes a sludge discharging hole 76a penetrating the front surface 39f and the rear surface 39 of the substrate 25, a sludge discharging pipe 76b formed of, for example, a bellows pipe or a steel pipe, a sludge discharging pump 76c, and a sludge discharging device. A tank 76d and a connecting pipe 76e are provided.
For example, one end of the sludge discharge pipe 76b is screwed into the inside of the sludge discharge hole 76a so that the one end opening of the sludge discharge pipe 76b communicates with the inside of the space 69. It is connected to one end. Then, the other end opening of the sludge discharge pipe 76b and the suction port of the sludge discharge pump 76c are communicably connected, and the discharge port of the sludge discharge pump 76c and the sludge discharge tank 76d can be communicated with each other by the connecting pipe 76e. Connected to.

The water storage tank 75a and the mud discharge tank 76d are composed of a collecting tank 75X in which the water storage tank 75a and the mud discharge tank 76d are integrated. That is, the partition 75w is provided inside the collecting tank 75X to divide the inside of the collecting tank 75X into two regions, one region is used as the water storage tank 75a, and the other region is used as the sludge discharge tank 76d.
That is, when a certain amount of water is first filled in the collecting tank 75X and the water pump 75d is driven to pump the water into the space 69, the water pumped into the space 69 and the excavating machine 26 excavate. Muddy water mixes with the soil and sand that has been removed. Then, by driving the pump 76c for sludge discharge, the muddy water in the space 69 is discharged to the sludge discharge tank 76d. The mud in the mud water discharged to the mud discharge tank 76d settles to the bottom of the mud discharge tank 76d, and the mud water that has entered the water storage tank 75a beyond the partition 75w is again pumped into the space 69 by the water pump 75d. Pumped. That is, since the muddy water can be circulated and supplied into the space 69, the amount of water used can be reduced. Further, since muddy water having a larger specific gravity than water can be supplied into the space 69, it can resist the pressure of the ground and groundwater, and the pressure in the ground and groundwater can be easily equalized with the pressure in the space 69. Therefore, the influence on the ground 10 can be reduced. Further, since the space 69 becomes muddy, mud can be discharged smoothly and excavation is facilitated.

Further, the connection structure between the water supply hole 75b and one end of the water supply pipe 75c and the connection structure between the sludge discharge hole 76a and one end of the sludge discharge pipe 76b may be the following connection structure. A pipe portion (not shown) communicating with the holes (water supply hole 75b, mud discharge hole 76a) is formed on the rear surface 39 of the substrate, and the opening end face of the pipe portion and the pipe (water supply pipe 75c, mud discharge pipe 76b) are formed. In the state where the pipe portion is joined to the pipe by covering the abutting portion with the annular joint member in a state in which the one end opening end surface of the pipe abuts each other, or the pipe portion is fitted into the pipe through the one end opening of the pipe. The pipe portion is joined to the pipe by tightening the outer peripheral surface of the one end opening of the pipe with an annular clip member.
Alternatively, the muddy water may be filled in the collecting tank 75X from the beginning, and the pump 75d for water supply may be driven to circulate the muddy water between the space 69 and the collecting tank 75X.

The propulsion device 4 includes, for example, one of the pair of outer surfaces 6a and 6b of the one of the tubes 2 having a rectangular cross section, which are installed on the guide base 90 provided in the cavity 100 serving as the starting base B and which face each other in parallel. A left hydraulic jack 62 arranged so that the cylinder 66 and the piston rod 63 extend in the same direction as the extension direction of the pipe 2 on the outer side of the left outer face 6a which is one outer face of the pipe 2; The cylinder 66 and the piston rod 63 extend in the same direction as the extension direction of the tube 2 laterally outside the right outer surface 6b, which is the other outer surface of the pair of outer surfaces 6a and 6b facing each other in parallel. And the right hydraulic jack 62 arranged as described above. A pressing plate 64 is provided at the tip of the piston rod 63 of the hydraulic jack 62.

The propulsion force transmission device 70 that receives a pressing force from the propulsion device 4 and transmits the pressing force to the pipe 2 at the lateral position of the outer surface of the pipe 2 installed at the starting base B is, for example, a pair of propulsion force transmission members. 85, 85, the propulsive force transmitting rod-shaped body 710, the above-mentioned substrate 25, the above-mentioned watertight performance maintaining member 35, and the above-mentioned tube side propulsive force receiving portion 21.
The left propulsive force transmitting member 85 as one propulsive force transmitting member is located outside the left outer side surface 6a of the tube 2 having a rectangular cross section installed on the guide 90 provided in the cavity 100 as the starting base B. And a transmission body 71 disposed so as to face the left outer side surface 6a in parallel with each other, and a left hydraulic pressure provided so as to extend in a direction away from the left outer side surface 6a of the pipe 2 at one end side of the transmission body 71. The force receiving portion 72 that receives the pressing force from the jack 62 and the other end side of the transmission body 71 are provided so as to come into contact with the other end 71f of the rod-shaped body 71x of the left propelling force transmission rod-shaped body 71A, which will be described later. It is provided with a pressing portion 73 that transmits the force transmitted through the receiving portion 72 and the transmission body 71 to the rod-shaped body 71x.
The right propulsion force transmission member 85 as the other propulsion force transmission member is located outside the right outer side surface 6b of the tube 2 having a rectangular cross section installed on the guide 90 provided in the cavity 100 as the starting base B. And a transmission body 71 arranged so as to face the right outer side surface 6b in parallel with each other, and one end side of the transmission body 71 is provided so as to extend in a direction away from the right outer side surface 6b of the pipe 2 and a right hydraulic pressure is provided. The force receiving portion 72 that receives the pressing force from the jack 62 and the other end side of the transmission body 71 are provided so as to come into contact with the other end 71f of the rod-shaped body 71x of the right propulsion force transmission rod-shaped body 71B, which will be described later. It is provided with a pressing portion 73 that transmits the force transmitted through the receiving portion 72 and the transmission body 71 to the rod-shaped body 71x.
The left propulsive force transmitting member 85 and the right propulsive force transmitting member 85 have, for example, the same configuration. In this way, by using the same structure, the left propulsive force transmitting member 85 can be used as the right propulsive force transmitting member 85, or the right propulsive force transmitting member 85 can be used as the left propulsive force transmitting member 85. It is possible and easy to use. Further, since it is only necessary to manufacture one type of propulsive force transmitting member 85, mass productivity is excellent.
The propulsion force transmission rod-shaped body 710 includes a rod-shaped body 71x having a length from one end 71e to the other end 71f that is longer than the shortest distance between the rear surface 39 of the substrate 25 and the rear end 6e of the leading tube 6, and a rod-shaped body. An inclination preventing portion 71c that protrudes from the other end 71f side of 71x is provided. The rod-shaped body 71x uses, for example, an H-shaped steel, and the tilt prevention portion 71c uses, for example, a steel material that is joined to the H-shaped steel forming the rod-shaped body 71x by welding or a connecting means such as a bolt. The tilt prevention portion 71c includes a face piece 71d having a surface that comes into surface contact with the left inner surface and the right inner surface of the leading tube 6.
The propulsive force transmitting rod-shaped body 710 is installed so that the center line of the rod-shaped body 71x faces the same direction as the center line of the leading tube 6, and the surface of the face body 71d and the left inner surface or the right inner surface of the leading tube 6 are provided. End 71e and the rear surface 39 of the substrate 25 are joined by welding or a connecting means such as a bolt so that they are in surface contact with each other.
That is, it is installed so that the center line of the rod-shaped body 71x of the left propulsion force transmission rod-shaped body 71A faces the same direction as the center line of the leading tube 6, and the surface of the face body 71d of the left propulsion force transmission rod-shaped body 71A. One end 71e of the rod-shaped body 71x of the left propulsive force transmission rod-shaped body 71A and the rear surface 39 of the substrate 25 are joined by welding or a connecting means such as a bolt so that the left inner surface of the lead tube 6 comes into surface contact. In addition, the rod-shaped body 71x of the right propelling force transmitting rod-shaped body 71B is installed such that the centerline of the rod-shaped body 71x faces the same direction as the centerline of the leading tube 6, and the surface of the face body 71d of the right propulsive-force transmitting rod-shaped body 71B. One end 71e of the rod-shaped body 71x of the right propulsion force transmission rod-shaped body 71B and the rear surface 39 of the substrate 25 are joined by welding or a connecting means such as a bolt so that the right inner surface of the lead tube 6 comes into surface contact.
The ends 71e, 71e of the left and right propulsion force transmitting rods 71A, 71B are coupled to the central portion between the upper and lower edges of the substrate 25.
According to the propulsion force transmission device 70 having the above configuration, the pressing force of the hydraulic jack 62 as the propulsion device 4 causes the left and right propulsion force transmission members 85, 85, the left and right propulsion force transmission rod-shaped bodies 71A, 71B, the substrate 25, Since the configuration is such that the pipe 2 is propelled by being transmitted to the pipe 2 through the watertight performance maintaining member 35 and the pipe-side propulsion force receiving portion 21, it becomes possible to apply a pressing force evenly to the left and right of the pipe 2.

The guide table 90 is provided in the hollow portion 100 as the starting base B to receive a reaction force transmitted from the pipe 2 to the hydraulic jacks 62, 62 when the pipes 2 are pressed by the left and right hydraulic jacks 62, 62. It is installed between the reaction force receiving wall 74 and a departure opening (called an entrance opening) from the cavity 100 to the underground 10 (not shown).
The starting port for moving the tube 2 in and out is a frame body having an opening through which the tube 2 passes, and a pipe which passes through the opening by being provided on the inner peripheral edge of the opening of the frame body and coming into contact with the outer peripheral surface of the tube 2. The watertight performance maintaining member for maintaining the watertight performance with the outer peripheral surface is provided.
The guide board 90 includes a guide surface 91 on which the tube 2 is placed and which guides the tube 2 to the departure port of the starting base B, and left and right installation stands 92, 92 provided on the left and right side portions of the guide surface 91. With. The installation table 92 is composed of a table provided so as to stand up from a side portion of the guide surface 91.
The left and right movements of the tube 2 placed between the inner side surfaces 92a, 92a on the guide surface 91 are restricted by the inner side surfaces 92a, 92a facing each other of the left and right installation bases 92, 92. It
The left hydraulic jack 62 is fixed to the rear side of the upper surface of the left installation table 92 by a fixture 67 and the right hydraulic jack 62 is fixed to the rear side of the upper surface of the right installation table 92. It is fixed by 67 or the like. Since the hydraulic jack 62 is installed on the table top of the installation table 92 in an inclined state according to the approach angle of the pipe 2 into the ground 10, the bottom surface of the cylinder 66 of the hydraulic jack 62 is the reaction force receiving wall 74. It will be inclined to the front. Therefore, contact plates 79, 79 that contact the bottom surface of the cylinder 66 are provided on the front surface of the reaction force receiving wall 74.
The force receiving portion 72 of the left propulsion force transmission member 85 is located in front of the left hydraulic jack 62 on the rear side of the table top surface of the left installation base 92, and the pressing portion 73 of the left propulsion force transmission member 85 is located. However, the left propulsion force transmission member 85 is installed so as to contact the other end 71f of the rod-shaped body 71x of the left propulsion force transmission rod-shaped body 71A.
Further, the force receiving portion 72 of the right propulsion force transmission member 85 is located in front of the right hydraulic jack 62 on the rear side of the table top surface of the right installation base 92, and the right propulsion force transmission member 85 is pressed. The right propulsion force transmission member 85 is installed so that the portion 73 contacts the other end 71f of the rod-shaped body 71x of the right propulsion force transmission rod-shaped body 71B.

When a straight pipe is mounted as the pipe 2, the guide base 90 has a guide surface 91 and the upper surfaces of the left and right installation bases 92, 92 formed in a flat surface, and the concave groove extends along the extension direction of the installation base 92. When a straight tube is used and a bent tube or a bent tube is placed as the tube 2, as shown in FIG. 13, the guide surface 91 and the upper surfaces of the left and right installation bases 92, 92 are curved tubes. A structure is used in which the groove 93 is formed to have a curved surface that matches the curvature and the concave groove 93 is curved and extends along the extension direction of the installation table 92. Further, a pipe entry angle setting means 95 (see FIGS. 12 and 13) for determining the installation inclination angle of the guide surface 91 according to the entry angle of the pipe 2 into the ground 10 is provided. For example, the pipe advancing angle setting means 95 is detachably provided on the lower surface of the guide 90, or is integrally formed on the lower surface of the guide 90, and is configured by a support base, a support frame, or the like. The guide base 90 is composed of a support base, a support frame, etc. integrally formed on the lower surface of the guide base 90.
Further, the outer surfaces 92b, 92b of the left and right installation bases 92, 92 (side surfaces parallel to the inner side surface 92a, which are the left and right side surfaces of the guide base 90) have a concave cross-section opening to the outer surface 92b. A recessed groove 93 extending in the extension direction (front-back direction) of the installation table 92 is provided. The front end surface of the installation base 92 corresponding to the front ends of the recessed grooves 93, 93 of the guide base 90 is formed with an opening 93a, and the traveling means 114 of the pressing member 110, which will be described later, is inserted into the recessed groove 93 through the opening 93a. Inserted in.
It should be noted that each of the columns 111 and 111 provided with the traveling means 114 of the pressing member 110, which will be described later, and the beam 112 are configured to be disassembled, and the traveling means 114 of each column 111 is inserted into the groove 93. The support members 110 may be assembled by connecting the upper ends of the support columns 111 and 111 with beam members 112 in a state where the support columns 111 and 111 are erected, and in this case, the recessed grooves 93 of the guide bases 90. , 93, and the rear end surface of the installation base 92 corresponding to the rear ends of the grooves 93, 93 of the guide base 90 may be closed.

As shown in FIGS. 12 and 13, the propulsive force transmission member 85 is configured by combining a transmission body 71, a force receiving portion 72, and a pressing portion 73, which are separately configured of steel, for example.
The transmission body 71 is configured by combining, for example, shaped steels. Then, the force receiving portion 72 extends from one end side in the extension direction of the transmission body 71 on one outer side surface 71a of the pair of outer side surfaces of the transmission body 71 in the direction orthogonal to the one outer side surface. And the pressing portion 73 is orthogonal to the other outer side surface 71b of the other outer side surface 71b of the pair of outer side surfaces of the transmission body 71 from the other end side in the extension direction of the transmission body 71. It is provided so as to extend in the direction. That is, the force receiving portion 72 and the pressing portion 73 are provided so as to extend in a direction away from each outer side surface 71 a, 71 b of the transmission body 71.
The force receiving portion 72 includes a connecting plate 72a that is connected to one end side of one outer surface 71a of the transmission body 71 by a connecting means such as a bolt and a nut or welding, and a force receiving plate 72b that receives a pressing force of the hydraulic jack 62. And a reinforcing plate 72c for connecting the connecting plate 72a and the force receiving plate 72b. The connecting plate 72a is formed of a flat plate that is in surface contact with one outer surface 71a parallel to the extension direction of the transmission body 71 and is connected to one end of the one outer surface 71a. The force receiving plate 72b is formed by a flat plate that forms a surface orthogonal to one outer surface 71a parallel to the extension direction of the transmission body 71.
The pressing portion 73 is connected to the other end side of the other outer side surface 71b of the transmission body 71 by a connecting plate 73a connected by a connecting means such as a bolt and a nut or welding, and the other end of the rod-shaped body 71x of the propulsion force transmission rod-shaped body 710. A pressing plate 73b that contacts 71f and a reinforcing plate 73c that connects the connecting plate 73a and the pressing plate 73b are provided. The connecting plate 73a is formed of a flat plate that is in surface contact with the other outer surface 71b parallel to the extending direction of the transmission body 71 and is connected to the other end of the other outer surface 71b. The pressing plate 73b is formed of a flat plate that forms a surface orthogonal to the other outer surface 71b that is parallel to the extension direction of the transmission body 71.

Since the excavating machine 26 is installed inside the leading pipe 6 that is first installed in the ground 10, use a leading pipe 6 whose length is longer than that of the succeeding pipe 7. However, conventionally, when propelling the front pipe 6 having such a long pipe length, the hydraulic jack 62 cannot be installed behind the front pipe 6 installed at the starting base B because the front pipe 6 has a long pipe length. In some cases, the leading pipe 6 cannot be propelled to the front pipe 6, or only a small hydraulic jack having a short piston rod extension stroke can be installed behind the leading pipe 6, and the piston rod extension stroke is provided behind the leading pipe 6. If only a small hydraulic jack with a short length can be installed, the leading tube 6 can be propelled only a little with one maximum extension operation of the piston rod of the hydraulic jack, so the tip of the piston rod of the hydraulic jack and the rod-shaped body 71x. The extension operation of the hydraulic jack is repeated many times by interposing a spacer (not shown) with the other end 71f of the hydraulic jack, or the hydraulic jack and the reaction force of the hydraulic jack each time the extension operation of the hydraulic jack is completed. It was necessary to move the receiving wall 74 forward and repeat the extension operation of the hydraulic jack many times, and the work efficiency of the hydraulic jack when propelling the lead pipe 6 into the ground 10 was poor.
According to the first embodiment, since the hydraulic jacks 62, 62 can be installed beside the left and right outer surfaces 6a, 6b of the lead pipe 6 installed in the starting base B, respectively. Even when the hydraulic jack 62 cannot be installed in the rear, the leading pipe 6 can be propelled, and the hydraulic jack 62 having a long extension stroke of the piston rod 63 can be used. The leading tube 6 can be moved a long distance by the maximum extension operation once, and the work efficiency of the hydraulic jack 62 can be improved.

As shown in FIGS. 12 and 13, the pressing member 110 includes a pair of support columns 111, 111 provided to face each other in parallel with each other at an interval wider than the lateral width of the guide 90, and a pair of support columns. A configuration including a gate-shaped body 113 including a beam member 112 that connects upper end portions of the 111 and 111, traveling means 114 that are respectively provided on the lower end portions of the pair of columns 111 and 111, and a connecting member 120. Is.
The gate-shaped body 113 is configured by combining a column 111 and a beam member 112 using a shaped steel such as an H-shaped steel.
The traveling means 114 includes a base 115 fixed to the inner surfaces of the lower ends of the columns 111, 111 facing each other, and wheels 116 rotatably provided on the base 115 via a rotation center axis. .
The base 115 is formed of, for example, a long member having a concave cross-section, which has rising plates extending in the same direction perpendicular to the long plates at both long side edges of the long plate. The member is attached with the opening of the recess facing upward so that the member extends in a direction orthogonal to the extension direction of the column 111 and parallel to the side surface of the tube 2.
Then, for example, a base plate of a caster provided with wheels 116 is fixed to a long plate that forms the bottom of the recess of the base 115, and the wheels 116 project above the rising plate from the bottom of the recess through the opening of the recess. It is provided to do. For example, two wheels 116 are provided at intervals along the extension direction of the base 115.

The traveling means 114 provided at the lower end of each of the columns 111, 111 is inserted into the recessed grooves 93 of the left and right installation bases 92, 92 of the guide base 90 via the openings 93a, and the guide surface 91 under the beam member 112. By inserting the connecting member 120 between the upper surface 6u of the pipe 2 placed above and the beam member 112, the upper wall surface 93t as the running surface of the concave groove 93 and the outer peripheral surface of the wheel 116 are brought into contact with each other. When the pipe 2 advances, the portal 113 provided with the traveling means 114 and the connecting member 120 move together together.

That is, the rear end 6e of the tube 2 remaining in the cavity 100 as the starting base B after the tube 2 has entered the ground 10 from the tip moves in a direction intersecting the central axis of the tube 2 (for example, after the tube 2). The tube rear end movement restricting means 200A for restricting the end 6e from floating upward is provided, and the tube rear end movement restricting means 200A engages with the wheel 116 of the pressing member 110 and forms a traveling surface of the wheel 116. A guide base 90 having a groove 93 is provided so that the wheel 116 is engaged with the groove 93 and the wheel 116 does not separate from the groove 93 in a direction orthogonal to the extension direction of the groove 93. A gate 113 positioned above the tube 2 so that the tube 112 faces the upper surface 6u (outer surface of the tube 2) of the tube 2 placed on the guide surface 91, the beam member 112 of the gate 113, and the tube 112. The connecting member 120 is inserted between the upper surface 6u of the second wheel 2 and the upper surface 6u and pushes up the beam member 112 to bring the outer peripheral surface of the wheel 116 into contact with the upper wall surface 93t of the groove 93.

That is, the connecting member 120 is inserted between the pipe 2 and the beam member 112 so as to bite like a wedge, and is closely attached to the pipe 2 and the beam member 112. Is transmitted to the pressing member 110, so that the wheels 116 of the pressing member 110 can travel on the running surface formed by the upper wall surface 93t of the concave groove 93. This is a member that contacts the upper wall surface 93t. The connecting member 120 is bitten like a wedge between the contact plate 121 that contacts the upper surface 6u of the pipe 2 and the contact plate 121 and the beam member 112, and pushes up the beam member 112 to lift the contact plate 121 and the beam member. It is configured by a square member 122 that is in close contact with 112 and makes the outer peripheral surface of the wheel 116 contact the upper wall surface 93t of the concave groove 93.

That is, a gate including a pair of columns 111, 111 facing each other, a beam member 112 connecting the upper ends of the columns 111, 111, and traveling means 114, 114 provided at the lower ends of the columns 111, 111. A guide 113 provided with a shape body 113, a groove 93 into which each traveling means 114 provided at the lower end of each column 111 of the pressing member 110 is inserted, and a pipe installed on a guide surface 91 of the guide 90. 2 and the beam 112 of the gate structure 113 are inserted so as to bite like a wedge so that the pipe 2 and the beam member 112 are brought into close contact with each other and the wheels 116 of the gate structure 113 can travel on the traveling surface. When the pipe 2 enters the ground 10 from the tip, it is the starting base B by providing the pipe rear end movement restricting means 200A constituted by the connecting member 120 for contacting the outer peripheral surface of the pipe and the upper wall surface 93t. The tube 2 is propelled into the ground 10 in a state where the rear end 6e of the tube 2 remaining in the cavity 100 is pressed by the tube rear end movement restricting means 200A so as not to move in the direction away from the guide surface 91. That is, when the pipe 2 is installed in the ground 10 from the tip, the pipe rear end movement restricting means 200A prevents the rear end of the pipe 2 remaining at the starting base B from rising.
That is, in the first embodiment, a guide base 90 having a guide surface 91 for contacting the lower surface (outer surface) that is one outer surface of the tube 2 to guide the tube 2 to the departure port of the starting base B, The rear end of the pipe 2 that restricts the rear end 6e of the pipe 2 remaining at the starting base B after entering the underground 10 from the front end via the departure port in the direction intersecting with the center line of the pipe 2. The pipe rear end movement restricting means 200A is movable along with the pipe 2 while pressing the pipe 2 so that the pipe 2 installed on the guide surface 91 is pressed against the guide surface 91. The holding member 110 is provided so as to be movable with respect to the table 90.

Next, a method of installing the pipe 2 in the ground 10 by the pipe installation device 1 will be described with reference to FIG. 11.
In addition, here, the case where the pipe length of the leading pipe 6 is longer than that of the succeeding pipe 7 is used, and the succeeding pipe 7 having the pipe length of about half of the pipe length of the leading pipe 6 is used as the succeeding pipe 7 An example will be described.
The substrate 25 to which the excavating machine 26, the propulsive force transmitting rod-like body 71, the water supply pipe 75c, and the sludge discharge pipe 76b are attached is installed inside the front pipe 6. That is, the rectangular peripheral surface 33 on the front surface 39 f of the rectangular plate 30 forming the substrate 25 is attached to the watertight performance maintaining member 35 on the frame rear surface 32 of the rectangular frame body 22 forming the tube side propulsive force receiving portion 21 inside the head tube 6. Install it so that it will be stuck through. As a result, when the pipe 2 is installed in the ground 10 from the hollow portion 100 formed in the ground 10, the excavating machine 26 is installed inside the tip pipe 6t side of the lead pipe 6 which is first put in the ground 10. To be done.
As shown in FIG. 11( a ), in the cavity 100 as the starting base B, a guide 90 is installed in front of the departure opening (entrance opening) of the lead pipe 6 to the ground 10, and the excavating machine 26 is installed. The front pipe 6 is installed on the guide surface 91 with the tip opening 6t of the front pipe 6 having the substrate 25, to which the water supply pipe 75c and the mud discharge pipe 76b are attached, installed inside, toward the departure port.
The guide board 90 is fixed to the ground of the starting base B with an anchor or the like so that the pipe 2 installed on the guide surface 91 does not move when moving on the guide surface 91. In order to increase the number, a weight is added to the guide table 90, or a heavier guide table 90 with increased weight is used.
Then, the traveling means 114 of the pressing member 110 is inserted into the concave grooves 93 of the left and right installation bases 92, 92 from the opening 93a, and the upper surface of the leading tube 6 placed on the guide surface 91 below the beam 112. The connecting member 120 is inserted between the 6u and the beam member 112, and the upper wall surface 93t as the running surface of the groove 93 and the outer peripheral surface of the wheel 116 are brought into contact with each other.
The left hydraulic jack 62 is fixed to the rear side of the upper surface of the left installation base 92, and the right hydraulic jack 62 is fixed to the rear side of the upper surface of the right installation base 92. Further, the left propulsion force transmission member 85 is installed so that the transmission body 71 faces the rear side of the left outer side surface 6a of the leading tube 6 in parallel, and the transmission body 71 is arranged on the rear side of the right outer side surface 6b of the leading tube 6. The right propulsion force transmission member 85 is installed so as to face the same in parallel.

Then, as shown in FIG. 11B, by operating the excavating machine 26 and the left and right hydraulic jacks 62, 62, the pressing plate 64 at the tip of the piston rod 63 becomes the force receiving plate 72 b of the propulsion force transmitting member 85. While in contact with each other, the pressing plate 73b of the propulsion force transmitting member 85 comes into contact with the other end 71f of the rod-shaped body 71x, and the leading tube 6 advances to the ground 10 as the piston rod 63 extends. That is, the water pump 75d of FIG. 8 is driven to supply the muddy water into the space 69, and the muddy water is circulated between the space 69 and the collecting tank 75X, and the hydraulic pressure source is controlled by the control device 65. By supplying pressure oil from 55 to the hydraulic motor 47 to rotate the rotary excavation body 46 and extending the piston rod 63 of the hydraulic jack 62, the propulsive force transmitted to the front pipe 6 via the propulsive force transmission device 70. The front pipe 6 is propelled forward by the ground excavation accompanying the rotation of the rotary excavation body 46, and the front pipe 6 is installed in the ground 10. The earth and sand excavated in the ground 10 by the rotary excavation bodies 46, 46 mix with water in the space 69 to form muddy water, which is discharged to the mud discharge tank 76d. When the front pipe 6 advances, the connecting member 120 and the pressing member 110 move together together and prevent the floating of the rear end 6e of the front pipe 6 remaining at the starting base B by the connecting member 120 and the pressing member 110. To be done.

Next, after maximally extending the piston rods 63, 63 of the left and right hydraulic jacks 62, 62, as shown in FIG. 11C, the piston rods 63, 63 are returned and the left and right propulsion force transmitting members 85 , 85 are removed, the succeeding pipe 7 is installed behind the leading pipe 6, and the rear end opening edge of the leading pipe 6 and the front end opening edge of the succeeding pipe 7 are connected in a watertight state. That is, the rear pipe 6e of the front pipe 6 is connected to the rear pipe 7 by welding or a fixture such as bolts, and as shown in FIG. 11(d), the other end 71f of the propulsion force transmitting rod-shaped body 710 is connected to the other end 71f. By connecting the one end 71e of the subsequent propulsion force transmission rod-shaped body 71 by bolts or welding, the succeeding propulsion force transmission rod-shaped body 710 is added to the rear of the leading propulsion force transmission rod-shaped body 71, and further, An extension pressure hose (not shown) is added to the other end of the pressure hose 56, an extension water supply pipe (not shown) is added to the other end of the water supply pipe 75c, and an extension mud pipe (not shown) is added to the other end of the mud pipe 76b. Add more.
Then, as shown in FIG. 11D, the left propelling force transmission member 85 is installed so that the transmission body 71 opposes the left side surface of the succeeding tube 7 in parallel, and the transmission body 71 is arranged on the right side surface of the succeeding tube 7. After the right propulsive force transmitting member 85 is installed so as to be parallel to and opposed to each other, by operating the excavating machine 26 and the left and right hydraulic jacks 62, 62, the pressing plates 64, 64 at the tips of the piston rods 63, 63 are moved. The force receiving plate 72b of the propulsive force transmitting member 85 comes into contact with the pressing plate 73b of the propulsive force transmitting member 85 to come into contact with the other end 71f of the rod-shaped body 71x, and as the piston rod 63 extends, the leading tube 6 is further extended. While propelling into the ground 10, the trailing pipe 7 moves forward.
Thereafter, in the same manner, the outer shell or the lining can be constructed by sequentially connecting the subsequent succeeding tube 7 to the subsequent succeeding tube 7 and installing them in the ground 10. If the rear end 6e of the trailing pipe 7 is lifted when propelling the trailing pipe 7 into the ground 10, the traveling means 114 of the pressing member 110 is opened in the concave grooves 93 of the left and right installation bases 92, 92. The connecting member 120 is inserted between the beam member 112 and the upper surface of the succeeding tube 7 placed on the guide surface 91 below the beam member 112 by inserting the connecting member 120 from 93a. If the succeeding pipe 7 is propelled after the wall surface 93t and the outer peripheral surface of the wheel 116 are brought into contact with each other, the rear end 6e of the succeeding pipe 7 remaining at the starting base B is prevented from rising. That is, when the front pipe 6 is installed in the ground 10, the pipe rear end movement restricting means 200A is always used, but when the rear pipe 7 is propelled into the ground 10, the rear end 6e of the rear pipe 7 is When the floating phenomenon occurs, the tube rear end movement restricting means 200A may be used, and when the rear end 6e of the succeeding tube 7 does not lift, the tube rear end movement restricting means 200A need not be used.

After constructing the outer shell B1 or the lining D, the excavating machine 26 is pulled back into the hollow portion 100 on the starting side, which is the starting point of excavation, and recovered. The excavating machine 26 may be pushed out into the cavity portion 100 on the arrival side and collected.

If the pipe installation device 1 described above is used, the excavating machine having the rotary excavation body 46 that rotates about the rotation center line L that intersects the propulsion direction of the leading pipe 6 inside the leading pipe 6 inside the tip opening 6t side. 26 is installed, the pipe 2 is pushed, and the underground is excavated by the excavating machine 26, so that the pipe 2 is propelled and installed in the ground 10. Therefore, even if the ground 10 is a mixture of hard and rubble. Since it becomes possible to excavate the underground portion near the inner corner of the pipe 2 having a rectangular cross section with the two rotary excavation bodies 46, 46, the pipe 2 can be smoothly propelled in the ground 10. Thus, the outer shell B1 or the lining D can be easily constructed.

According to the first embodiment of the pipe installation device 1, since the propulsive force transmission device 70 is provided, the starting base B such as the cavity portion 100 in which the pipe installation device 1 is installed is small, and the starting base B of the pipe 2 is installed. Even when there is no installation space for installing the hydraulic jack 62 on the rear side, it is possible to install the hydraulic jacks 62, 62 along the sides of the left and right outer surfaces 6a, 6b of the pipe 2. Even if the hydraulic jacks 62, 62 cannot be installed on the rear side of the pipe 2, the pipe 2 can be propelled and advanced to the ground 10.

Further, since the hydraulic jacks 62, 62 can be installed along the lateral sides of the left and right outer surfaces 6a, 6b of the pipe 2, the hydraulic jack 62 having a long extension stroke of the piston rod 63 is used. As a result, the pipe 2 can be moved a long distance by one maximum extension operation of the piston rod 63, and the work efficiency of the hydraulic jack 62 can be improved.

In the case where the succeeding pipe 7 has the same pipe length as the leading pipe 6, the left and right propulsion force transmitting members 85, 85 are replaced in the state of FIG. 11C. Is provided with a horizontal member (not shown) that is provided across the pressing plates 64, 64 of the left and right hydraulic jacks 62, 62 and is in contact with the other ends 71f, 71f of the left and right propulsion force transmission rod-shaped bodies 71A, 71B. When the excavating machine 26 and the left and right hydraulic jacks 62, 62 are operated in this state, the pressing force by the left and right hydraulic jacks 62, 62 is transmitted to the leading pipe 6 via the horizontal member, and the leading pipe 6 moves forward. Therefore, an installation space for the succeeding pipe 7 is formed between the rear end 6e of the leading pipe 6 and the reaction force receiving wall 74.
When the succeeding pipe 7 is sequentially connected to the rear end of the leading pipe 6, if the installation space for installing the hydraulic jack 62 behind the succeeding pipe 7 at the starting base B is secured, A hydraulic jack 62 is installed at the rear side of the subsequent pipe 7 at the base B, and the other ends 71f and 71f of the left and right propulsion force transmission rod-shaped members 71A and 71B or the other ends 71f of the left and right propulsion force transmission rod-shaped members 71A and 71B. , 71f may be pushed by a hydraulic jack 62 to push a horizontal member, not shown, to propel the trailing pipe 7 and the leading pipe 6.

According to the first embodiment of the pipe installation device 1, the rear end 6e of the pipe 2 remaining at the starting base B after the pipe 2 has penetrated into the ground from the tip moves in the direction intersecting the center line of the pipe 2. By providing the pipe rear end movement restricting means 200A for restricting, when the pipe 2 is installed in the ground 10 from the tip, for example, the rear end 6e of the pipe 2 remaining on the start base B is lifted up, etc. Since the phenomenon in which the rear end 6e of the pipe 2 remaining in B moves in the direction intersecting with the center line of the pipe 2 (hereinafter, referred to as the rear pipe movement phenomenon), the deviation of the traveling direction of the pipe 2 entering the ground 10 can be suppressed. And the pipe 2 can be accurately installed at the planned underground position. Further, when the rear end 6e of the tube 2 moves in a direction intersecting the center line of the tube 2, the watertight performance maintaining member provided on the inner peripheral edge of the opening of the frame of the departure port and the watertight performance of the outer peripheral surface of the tube 2. However, in the first embodiment, the pipe 2 is started separately from the departure port. A guide 90 having a guide surface 91 for guiding to the departure port of the base B, and a rear end of the pipe 2 remaining at the starting base B after the pipe 2 enters the ground 10 from the tip via the departure port. Since the pipe rear end movement restricting means 200A for restricting the movement of 6e in the direction intersecting the center line of the pipe 2 is provided, the above-mentioned problem can be solved.
The cause of the above-described pipe rear end movement phenomenon is that the weight of the excavating machine 26 provided inside the leading pipe 6 is heavy, and that the leading end side of the pipe installed in the ground 10 of the leading pipe 6 is It is conceivable that the weight balance of the lead pipe 6 is lost when the length of the pipe remaining at the starting base B is longer than the length of the lead pipe 6. Further, the above-mentioned pipe rear end movement phenomenon can occur regardless of whether a bent pipe, a straight pipe, or a bent pipe is used as the pipe 2, but especially when the bent pipe is installed in the ground 10, The connecting portion between the pipes forming the curved pipe is a corner portion, and only the corner portion of the connecting portion of the bent pipe placed on the guide surface 91 formed on the curved surface is the curved surface of the guide surface 91. Because of the contact, the corner portion of the connecting portion of the bent pipe serves as a fulcrum of rotation to facilitate the rotation, so that the above-mentioned pipe rear end movement phenomenon tends to be remarkable. According to the first embodiment, it is possible to reliably suppress the movement phenomenon of the pipe rear end.
Further, the tube rear end movement restricting means 200A is movable together with the tube 2 while pressing the tube 2 installed on the guide surface 91 so as to press the tube 2 against the guide surface 91, and is movable with respect to the guide base 90. Since the pressing member 110 is provided as described above, it is possible to push the pipe 2 against the guide surface 91 and to propel the pipe 2 into the ground 10 while suppressing the above-mentioned pipe rear end movement phenomenon.
Further, the pressing member 110 has a pair of support columns 111, 111 arranged on both sides of the pipe 2 at a distance wider than the lateral width of the pipe 2 installed on the guide surface 91, and a pair of support columns 111, 111. Is formed into a gate-shaped body 113 provided with an upper surface 6u (outer surface) of the tube 2 installed on the guide surface 91 by connecting upper end portions (one end portions) of the two and the beam member 112 facing the upper surface 6u, and the gate-shaped body 113. Since the connecting member 120 for closely contacting the beam member 112 and the upper surface 6u of the pipe 2 is provided, the pipe 2 is pressed against the guide surface 91 by the beam member 112 and the connecting member 120 of the portal 113, and The pipe 2 can be propelled into the ground 10 while suppressing the end movement phenomenon.
Since the installation bases 92, 92 on the left and right of the guide base 90 are provided with the concave groove 93 forming the traveling surface, and the pressing member 110 is provided with the traveling means 114 that travels on the traveling surface and is engaged in the concave groove 93. The pressing member 110 can be moved smoothly, and the propulsion work can be performed efficiently.

Embodiment 2 of tube installation device 1
As the tube rear end movement restricting means, the lower end of the column 111 of the pressing member 110 may be detachably attached to the propulsion force transmitting member 85. In this case, by pushing the pipe 2 while pushing the upper surface of the rear end portion of the pipe 2 with the holding member 110, the holding member 110 also moves together with the pipe 2, and thus the pipe rear end movement as in the first embodiment. The phenomenon can be prevented. That is, the tube rear end movement restricting means 200A according to the second embodiment is movable with the pipe 2 while pressing the pipe 2 installed on the guide base 90 so as to press the pipe 2 against the guide surface 91, and to the guide base 90. The pressing member 110 is detachably attached to the propulsion force transmitting member 85 so as to be movable with respect to the pressing member 110. In the case of the second embodiment, the traveling means 114 and the traveling surface may not be provided.

Embodiment 3 of tube installation device 1
As the tube rear end movement restricting means, it is possible to use a structure that is formed in a tunnel cylinder shape surrounding the outer peripheral surface of the tube 2 placed on the guide surface 91 and is fixed in front of the departure port.

Embodiment 4 of tube installation device 1
As the tube rear end movement restricting means, a weight (not shown) mounted on the upper surface 6u of the tube 2 mounted on the guide surface 91 may be used.

Embodiment 5 of tube installation device 1
As shown in FIGS. 14 and 15, on the inner side surfaces 92a, 92a facing each other of each of the left and right installation bases 92, 92, a concave cross-section opening to the inner side surface 92a is formed in the extension direction of the installation base 92. The recessed grooves 94, 94 as extending recesses are provided, and the left and right outer surfaces 6a, 6b of the tube 2 are provided with the protruding portions 96 that are inserted into and engaged with the left and right recessed grooves 94, 94. The convex portion 96 is provided so as to be engaged with the concave groove 94 so as not to separate from the concave groove 94 in a direction orthogonal to the extending direction of the concave groove 94. That is, the convex portions 96 provided on the left and right outer surfaces 6a and 6b of the tube 2 placed on the guide surface 91, and the left and right installation bases 92 and 92 that oppose the left and right outer surfaces 6a and 6b. Concave recesses 94 as concave portions provided on the inner side surfaces 92a, 92a, or concave portions provided on the left and right outer side surfaces 6a, 6b of the tube 2 placed on the guide surface 91. , The projections provided on the left and right inner surfaces 92a, 92a of the left and right installation bases 92, 92 facing the left and right outer surfaces 6a, 6b cause the pipe 2 to move from the tip to the ground 10 from the tip. A pipe rear end movement restricting unit that restricts the rear end of the pipe 2 remaining at the starting base B after entering the pipe 2 in a direction intersecting the central axis of the pipe 2 is configured. The front end surface of the installation base 92, which corresponds to the front ends of the concave grooves 94, 94 of the guide base 90, is formed with an opening 94a, and the pipe 2 propels the convex portion 96 beyond the opening 94a to the ground. Before entering 10, the convex portion 96 is removed.
In the case of the fifth embodiment, as shown in FIGS. 14 to 16, the convex portions 96 attached to the left and right outer surfaces 6a and 6b of the pipe 2 by welding, bolts, nuts or the like are provided in the concave groove 94 from above the guide surface 91. An insertion hole 97 is formed by notching the upper wall of the concave groove 94 so that it can be inserted therein.
In addition, when the insertion hole 97 is not provided, after the tube 2 is installed on the guide surface 91, the projections that form the convex portions 96 that are inserted into the concave groove 94 are provided on the left and right outer surfaces 6a of the tube 2. It may be attached to 6b by welding, bolts and nuts or the like.

According to the fifth embodiment of the pipe installation device 1, the pipe rear end movement restricting means comes into contact with the outer surface of the pipe 2 to guide the pipe 2 into the ground, and the pipe installed on the guide face 91. The guide stand 90 provided with the inner side surfaces 92a, 92a of the left and right installation bases 92, 92 located on both sides of the pipe 2, and the left and right sides of the pipe 2 installed on the guide surface 91 as the outer surface of the pipe 2. A concave portion and a convex portion which are provided on the outer side surfaces 6a and 6b and the inner side surfaces 92a and 92a (wall bodies) of the left and right installation bases 92 and 92 which face the left and right outer side surfaces 6a and 6b to form concave and convex engagement. Since the concave-convex engaging body is made of, the concave-convex engaging body can prevent the movement phenomenon of the rear end of the pipe.

It should be noted that one or more of the pipe rear end movement restricting means described in the first to fifth embodiments of the pipe installation device 1 may be used in combination.
Further, in the above, an example in which the tube 2 is placed on the guide surface 91 which is a concave curved surface and the tube 2 is installed in the ground has been shown. However, the guide surface which is a raised curved surface of the guide 90 is shown. The pipe 2 may be placed on top and the pipe 2 may be installed underground.
Further, as the pressing member of Embodiments 1 and 2 of the pipe installation device 1, a pressing member having a configuration not including the connecting member 120 may be used. For example, the beam member 112 of the portal 113 and the upper surface 6u of the tube 2 may be used in contact with each other, or the beam member 112 of the portal 113 and the upper surface 6u of the tube 2 may be detachably connected. ..
Further, the lower wall surface as the traveling surface of the groove 93 and the outer peripheral surface of the wheel 116 may be in contact with each other. In addition, the traveling means 114 of the gate-shaped body 113 is engaged in the recessed grooves 94, 94 formed in the inner side surfaces 92a, 92a of the respective bases forming the left and right installation bases 92, 92, so that the recessed grooves 94, 94 are engaged. The traveling surface formed inside may be configured so that the wheels 116 of the traveling means 114 can travel.
It may be configured such that the traveling means 114 and the traveling surface are not provided.
In the first, second, and fourth embodiments, a guide stand having a guide surface without the left and right installation stands 92, 92 may be used.

Embodiment 6 of tube installation device 1
As shown in FIG. 17, the rotation center line L of the rotary excavation body 46 is parallel to a pair of outer surfaces of the leading tube 6 that face each other in parallel, and is not orthogonal to a plane orthogonal to the propulsion direction of the leading tube 6. By providing the excavating machine rocking drive device 250 which is set to intersect with each other in the state of, the cross-sectional area wider than the cross-sectional area of the front pipe 6 is provided in front of the front pipe 6 prior to the advance of the front pipe 6. It is also possible to use the pipe installation device 1X that can be excavated and has a residual trench in front of the leading pipe 6. For example, as shown in FIGS. 17(a) and 17(b), the rotary excavation body 46 has a configuration capable of swinging to the left and right in the excavation traveling direction.
Hereinafter, an example of the pipe installation device 1X will be described, but the same components as those of the pipe installation device 1 according to the first embodiment will be designated by the same reference numerals and detailed description thereof will be omitted.
The pipe installation device 1X of the sixth embodiment includes a substrate 25, which is the configuration of the excavation device 3 of the pipe installation device 1 described in the first embodiment, and an excavation machine swing drive device 250 instead of the pipe-side propulsion force receiving portion 21. It has a different structure.
The excavation machine swing drive device 250 includes a swing substrate 300, a guide member 310 for the swing substrate 300, and a swing substrate driving means 320.
In the tube installation device 1X, the guide member 310 is installed inside the front tube 6 on the side of the front end opening 6t so that the center line of the cylinder of the cylindrical guide member 310 and the center line of the tube of the front tube 6 coincide with each other. The watertightness between the outer peripheral surface 330 of the cylinder of the guide member 310 and the inner peripheral surface 6s of the lead tube 6 is maintained by a watertight performance maintaining member 340 such as rubber packing, and the rocking substrate 300 is disposed on the lead tube 6 with respect to each other. The left and right side walls 301, 302 having a center between a pair of outer surfaces facing each other in parallel as the center of rotation are attached to the guide member 310 so as to be able to swing back and forth, and the outer peripheral surface 390 of the swing substrate 300 and the guide member 310. The watertightness between the inner peripheral surface 350 of the cylinder is kept by a watertight performance maintaining member 125 such as a rubber packing. A propulsive force receiving portion 630 is provided in front of the guide member 310 on the inner side of the tip tube 6 on the side of the tip opening 6t, and the propulsive force receiving portion 630 is a guide installed on the inner side of the tip tube 6 on the side of the tip opening 6t. The front end face 311 of the cylinder of the member 310 is contacted, the forward movement of the guide member 310 is regulated, and the propulsive force transmitted to the guide member 310 via the propulsive force transmission device 70 can be transmitted to the leading tube 6. As possible, it is fixed to the inner peripheral surface 6s of the leading end tube 6 on the side of the front end opening 6t by welding, fixing means such as bolts and nuts. In addition, the swing substrate 300 is provided with a column holding through hole 130, a sludge pipe holding through hole 140, and a water supply pipe holding through hole 150 penetrating the flat plate of the swing substrate 300 back and forth, and the column holding through hole 130. Is held in a fixed state with the support column 42 of the support section 40 of the excavating machine 26 passing therethrough, and is held in a fixed state with the tip of the sludge discharge pipe 76b passing through the sludge discharge pipe holding through hole 140. The water supply pipe holding through hole 150 is held in a fixed state with the tip of the water supply pipe 75c penetrating therethrough. Then, the rotary excavation body 46 of the excavation machine 26 provided with a plurality of excavation bits (excavation blades) 52 is positioned in front of the tip opening 6t of the leading pipe 6 and the support column 42 supporting the rotary excavation body 46 is the rocking substrate. It is supported by 300.
According to the pipe installation device 1X of Embodiment 6 of the pipe installation device 1, when excavating the ground 10 in front of the leading pipe 6 with the rotary excavation body 46, the swing substrate driving means 320 such as a hydraulic jack swings. By pressing and pulling back the rear surfaces of the moving substrate 300 on the side walls 301 and 302 side to move them back and forth, the rotation center line L of the rotary excavation body 46 is a surface orthogonal to the propulsion direction of the front pipe 6 and the front pipe 6. In a first state in parallel with a pair of outer surfaces that face each other in parallel to each other (for example, upper and lower outer surfaces of the leading tube 6), and a pair of outer surfaces of the leading tube 6 that face each other in parallel (for example, the leading tube 6). It is set to a second state (see FIGS. 17(a) and 17(b)) which is parallel to the upper and lower outer surfaces and intersects with the surface orthogonal to the propulsion direction of the leading tube 6 in a state other than the orthogonal direction. It
That is, since the pipe installation device 1X includes the excavation machine swing drive device 250 for swinging the rotary excavation body 46 in the left-right direction of the leading pipe 6 in front of the leading pipe 6, the pipe in front of the leading pipe 6 in the ground. When excavating 10 with the rotary excavation body 46, the oscillation substrate 300 can be driven by the oscillation substrate driving means 320 to swing the rotary excavation body 46, for example, in the left-right direction. The right and left width that can be excavated can be increased as compared with the case where the rocking is not performed. That is, if the pipe installation device 1X is used, it is possible to excavate the underground 10 in front of the leading pipe 6 at a left-right width interval wider than, for example, the left-right width interval of the leading pipe 6 before the leading pipe 6 advances. Since the front pipe 6 can be dug in the left-right width direction in front of the front pipe 6, the hard ground layer in front of the front pipe 6 can be excavated. In 10, it can be smoothly propelled.

When the pipe is installed in the ground 10 using the pipe installation device 1X including the excavation machine swing drive device 250, a cross-sectional area wider than the cross-sectional area of the front pipe 6 is excavated in front of the front pipe 6. it can. That is, in the ground 10 in front of the head pipe 6, it is possible to excavate, for example, the ground 10 on the left and right sides of the head pipe 6, so that the pipe 2 can be smoothly propelled in the ground 10.

Embodiment 7 of tube installation device 1
As shown in FIGS. 18 and 19, the rotary excavation body includes a first excavation bit 8e and a second excavation bit 8f as excavation blades provided so as to project from the outer peripheral surface 51 of the housing 50. The rotary excavation body 46A having the above configuration may be used.
A plurality of second excavation bits 8f are arranged in the direction along the rotation center line L of the housing 50 to form a second excavation bit group 810.
A plurality of bit attachment portions 83 are provided so as to be scattered on the outer peripheral surface 51 of the housing 50. Each of the first excavating bits 8e is detachably attached to an individual bit attaching portion 83 provided on the outer peripheral surface 51 of the housing 50. The second excavation bit 8f is provided on a bit installation plate 84 that is detachably attached to a plurality of bit attachment portions 83 provided on the outer peripheral surface of the housing 50. That is, the second excavation bit group 810 is attached to the bit attachment portion 83 and extends along the rotation center line L of the housing 50 along the circumferential width of the outer peripheral surface 51 of the housing 50 (direction along the rotation center line L). Of the second excavating bit 8f on the bit installation surface 84a of the bit installation plate 84 extending over the width of the housing 50, that is, both end surfaces in the direction along the rotation center line L of the housing 50. It is a configuration that is detachably or fixedly provided so as to be aligned in the direction along L.
In each of the rotary excavation bodies 46A, the first excavation bits 8e are provided at positions separated from each other by 180° in the circumferential direction of the outer peripheral surface 51 of the housing 50. The second excavation bit group 810 is provided on the outer peripheral surface 51 of the housing 50 in a portion where the first excavation bit 8e is not provided.
As shown in FIG. 18( b ), the tip of each excavating bit 8 f of each second excavating bit group 810, 810 provided on the outer circumferential surface 51 of the housing 50 at positions 180° apart from each other in the circumferential direction is It is set so as not to be located on the same surface 85e orthogonal to the rotation center line L of the housing 50. That is, the ground portion that is not excavated between the adjacent excavation bits 8f in the one second excavation bit group 810 can be excavated by each excavation bit 8f in the other second excavation bit group 810. In short, each of the rotary excavation bodies 46A has a complementary pair of second excavation bits that enable excavation of the ground portion that cannot be excavated by the second excavation bit group 810 on one side by the second excavation bit group 810 on the other side. This is a configuration including drilling bit groups 810, 810.
Then, as shown in FIG. 19A, the first distance 80x (that is, the first distance 80x from the rotation center line L of the housing 50 to the tip of the first excavation bit 8e via a line orthogonal to the rotation center line L). No. 1 excavation bit 8e) and the second distance 81x (that is, the second excavation bit 8e) from the rotation center line L of the housing 50 to the tip of the second excavation bit 8f via a line orthogonal to the rotation center line L. (Drilling radius by drilling bit) is different.
That is, the excavation diameter by the first excavation bit 8e with the first distance 80x as the excavation radius is between the upper and lower inner wall surfaces 6c and 6d of the lead pipe 6 (between the inner wall faces of one pair of wall faces of the lead pipe 6). The excavation diameter by the second excavation bit 8f, which is set smaller than the dimension 9x and has the excavation radius of the second distance 81x, is larger than the dimension 9x between the upper and lower inner wall surfaces 6c and 6d of the lead pipe 6 of the lead pipe 6. By also setting a large value, the rotary excavation body 46A is configured to be movable in front of the leading pipe 6 and inside the leading pipe 6 via the tip opening 6t of the leading pipe 6.
That is, the first excavation body 46A passes through the inside of the pipe 2 because the first excavation body 46A is set to have a radius of rotation that allows the rotation excavation body 46A to rotate about the rotation center line L inside the leading pipe 6. It becomes possible, and the excavating machine 26 can be pulled back to the hollow portion 100 on the departure side and collected.
Further, the second distance 81x is such that the rotary excavation body 46A cannot rotate about the rotation center line L inside the lead tube 6 and the rotary excavation body 46A is located in front of the tip opening 6t of the lead tube 6. If it is set, the turning radius is set.
That is, the rotary drilling body 46A is rotationally driven in a state of being positioned in front of the tip opening 6t of the leading tube 6 so that the first drilling bit 8e and the second drilling bit 8f move to the tip opening 6t of the leading tube 6. The ground at the front position can be excavated, and the rotary excavation body 46A passes through the pipe 2 (the leading pipe 6 and the succeeding pipe 7) and can be collected in the cavity 100 from which the pipe 2 has started.
By providing the rotary drilling body 46A as described above, it is possible to excavate a hole having a cross-sectional area that is, for example, a vertical width larger than the cross section of the tip opening 6t in front of the tip opening 6t of the lead tube 6, and thus the tip of the lead tube 6 is formed. The ground can be excavated before the opening edge collides with the ground, and the pipe 2 can be more smoothly propelled.
Further, when the excavating machine 26 is collected, as shown in FIG. 19B, the tip of the second excavating bit 8f of the second excavating bit group 810 is the same as the upper and lower inner wall surfaces 6c and 6d of the lead pipe 6. After not being positioned above the position showing the plane, the rotary excavation body 46A is pulled back into the pipe 2 and the excavation machine 26 is recovered in the hollow portion 100 on the starting side.

That is, according to the seventh embodiment of the pipe installation device 1, the first distance 80x (that is, the first distance 80x from the rotation center line L of the housing 50 to the tip of the first excavation bit 8e via the line orthogonal to the rotation center line L). , The first excavation bit 8e and the second distance 81x (that is, the first excavation bit 8e) from the rotation center line L of the housing 50 to the tip of the second excavation bit 8f via a line orthogonal to the rotation center line L. 2 is set differently, and the excavation diameter by the first excavation bit 8e with the excavation radius at the first distance 80x is equal to that of the guide blade pipe 9 (see FIG. 9) of the leading pipe 6. The excavation diameter by the second excavation bit 8f, which is smaller than the dimension 9x between the upper and lower inner wall surfaces 6c, 6d and has the second distance 81x as the excavation radius, is the dimension 9x between the upper and lower inner wall surfaces 6c, 6d of the lead pipe 6. The rotary drilling body 46A set to be larger than the above. Therefore, by rotating the rotary excavation body 46A located in front of the tip opening 6t of the lead tube 6, the excavation bits 8e and 8f excavate the ground, so that the lead tube 6 is provided in front of the tip opening 6t of the lead tube 6. Width dimension of the square cross section of the tip opening 6t of the leading tube 6 (width dimension corresponding to the radial direction of the rotary drilling body 46A, for example, the upper and lower inner wall surfaces of the leading tube 6). It is possible to excavate a hole having a square cross section with a width dimension larger than the dimension 9x between 6c and 6d. Therefore, the ground located in front of the tip opening 6t of the head pipe 6 can be reliably excavated by the excavating bits 8e and 8f before the tip opening edge of the head pipe 6 collides with the ground. It is possible to prevent a situation in which the leading pipe 6 cannot be propelled due to collision with the hard ground, and the pipe 2 can be more smoothly propelled even when the ground is hard ground.

Further, the tip end position of each excavation bit 8f of each of the second excavation bit groups 810, 810 provided on the outer peripheral surface 51 of the casing 50 at positions separated from each other by 180° in the circumferential direction is the rotation center of the casing 50. It is set so as not to be located on the same plane 85e orthogonal to the line L. That is, the pair of second excavation bit groups 810, 810 provided at positions circumferentially separated from each other on the outer peripheral surface 51 of the housing 50 by 180° are rotated by the rotary excavation body 46A so as to rotate the second excavation body. Since the ground portion that cannot be excavated by the bit group 810 can be excavated by the other second excavation bit group 810, a square cross section having a width dimension larger than the width dimension of the square cross section of the tip opening 6t of the leading pipe 6 is used. The hole can be efficiently excavated, and the pipe 2 can be more smoothly propelled.
Further, by arranging the respective second excavation bit groups 810 on the outer peripheral surface 51 of the housing 50 with the rotation center line L as the center, for example, the rotation center of gravity of the rotary excavation body 46A can be kept constant. Therefore, the rotation of the rotary excavation body 46A becomes smooth and efficient excavation can be performed, and the pipe 2 can be more smoothly propelled.
Further, since the second excavating bit 8f and the first excavating bit 8e are provided, the hole having the excavating diameter with the second distance 81x as the excavating radius is made more efficient by the second excavating bit 8f and the first excavating bit 8e. Can be excavated.

The second excavation bit group 810 may be configured by an aggregate of the second excavation bits 8f individually attached to the individual bit attachment portions 83 provided on the outer peripheral surface 51 of the housing 50.
In addition, on the outer peripheral surface 51 of the housing 50, the second linearly or non-linearly extending in the direction along the rotation center line L across both end surfaces in the direction along the rotation center line L of the housing 50. Of the drill bits 8f are arranged so as to be lined up individually, or along the rotation center line L across both end faces in the direction along the rotation center line L of the casing 50 on the outer peripheral surface 51 of the casing 50. A rotary drilling body 46A having a second drilling bit with one drilling blade extending linearly or non-linearly in a direction, wherein the rotary drilling body 46A has a center of rotation L inside the tube 2. It suffices that it is configured so as not to be rotatable about the center and to be rotatable at a position in front of the tip opening 6t of the leading tube 6.
Further, the second drilling bit groups 810, 810 do not have to be provided on the outer peripheral surface 51 of the housing 50 at positions separated from each other by 180° in the circumferential direction.
In short, in the rotary drilling body 46A, the first distance 80x from the rotation center line L to the tip of the first drilling bit 8e passing through on the line orthogonal to the rotation center line L is the rotary drilling body 46A being inside the front pipe 6. Is set to a rotation radius that is rotatable about the rotation center line L, and the second distance 81x from the rotation center line L to the tip of the second excavation bit 8f via the line orthogonal to the rotation center line L is rotated. When the excavated body 46A cannot rotate about the rotation center line L inside the pipe 2, and when the rotated excavated body 46A is positioned in front of the tip opening 6t of the leading pipe 6, the rotation center line L serves as the center. It may be set to a rotatable radius.

Further, the rotary excavation body may be configured without the first excavation bit 8e. That is, a rotary excavation body having only the second excavation bit 8f may be used as the excavation bit.
In short, in the case where the rotary excavation body does not include the first excavation bit 8e, the shortest distance from the rotation center line L to the outer peripheral surface 51 of the casing 50 of the rotary excavation body via a line orthogonal to the rotation center line L. The first distance, which is the distance, is set to a radius of rotation that allows the rotary excavation body to rotate about the rotation center line L inside the leading pipe 6, and passes from the rotation center line L to a line orthogonal to the rotation center line L. The second distance 81x to the tip of the second excavation bit 8f (excavation bit) is such that the rotary excavation body cannot rotate about the rotation center line L inside the pipe 2 and the rotary excavation body has the front pipe 6 When it is located in front of the front end opening 6t, the radius of rotation may be set to be rotatable about the rotation center line L.
That is, the diameter of the housing 50 whose radius is the first distance is set to be smaller than the dimension between the upper and lower inner wall surfaces 6c and 6d of the lead pipe 6, and the second distance 81x is the second excavation radius. Since the drilling diameter by the drilling bit 8f is set to be larger than the dimension 9x between the upper and lower inner wall surfaces 6c and 6d of the leading tube 6 of the leading tube 6, the rotary drilling body 46A sets the tip opening 6t of the leading tube 6 at the tip opening 6t. It is configured to be movable in front of the leading tube 6 and inside the leading tube 6 via.
According to the seventh embodiment of the pipe installation device 1, by the excavation by the second excavation bit 8f, for example, the upper and lower inner wall surfaces 6c and 6d of the leading pipe 6 in front of the leading pipe 6 (one pair of wall faces of the leading pipe 6). ), it becomes possible to excavate the ground 10 at a vertical width interval wider than the vertical width interval of the leading tube 6 and it is possible to excavate the leading tube 6 in the vertical width direction in front of the leading tube 6. Therefore, even if the ground is hard ground, the pipe 2 can be more smoothly propelled.

When the pipe 2 is installed in the ground 10 using the pipe installation device including the rotary excavation body 46A, a cross-sectional area wider than the cross-sectional area of the front pipe 6 can be excavated in front of the front pipe 6. That is, in the ground 10 in front of the head pipe 6, it is possible to dig in the ground 10 above and below the head pipe 6, for example, so that the above-mentioned pipe rear end movement phenomenon easily occurs. Therefore, when the pipe 2 is installed in the ground 10 using the pipe installation device of the seventh embodiment, it is effective to suppress the above-mentioned pipe rear end movement phenomenon by using the above-mentioned pipe rear end movement restricting means. Is.

Embodiment 8 of tube installation device 1
By using the pipe installation device including the rotary excavation body 46A described above and the excavation machine rocking drive device 250 described above, in the ground 10 in front of the head pipe 6, the remaining space 10 in the ground 10 on the upper, lower, left, and right sides of the head pipe 6. Since the moat is possible, the above-mentioned pipe rear end movement phenomenon is more likely to occur. Therefore, when the pipe 2 is installed in the ground 10 using the pipe installation device of the eighth embodiment, it is effective to suppress the above-mentioned pipe rear end movement phenomenon by using the above-mentioned pipe rear end movement restricting means. Is.

As a method of transmitting the propulsion force of the propulsion device such as the hydraulic jack 62 to the pipe 2, a propulsion force transmission member (not shown) protruding rearward from the rear end opening of the pipe 2 may be provided. The rear end surface of the tube 2 may be directly pressed.

Embodiment 1 of tube 2
The pipe 2 installed in the ground 10 using the pipe installation device 1 described above is a pipe having a rectangular cross section, and the center line (center axis) of the pipe = (center point of the cross section orthogonal to the extension direction of the pipe). Is a quadrangle in cross section when the pipe is cut along a plane that is orthogonal to the line that is continuously connected along the extension direction of the pipe. A pipe (a pipe whose center line is a curved line) or a pipe which extends straight (a pipe whose center line is a straight line (hereinafter referred to as a straight pipe)).

Then, as shown in FIG. 20, as a straight pipe, one pair of side walls 2a, 2a of the pipe 2 which face each other in parallel are formed in a congruent trapezoid, and the trapezoidal side edges 2s of the trapezoid of the side wall 2a, A pipe 2 having a trapezoidal side wall 2a whose 2s is parallel to the center line 2C of the pipe 2 is used, and the plurality of pipes 2 are sequentially connected to each other and installed in the ground 10. In the bent pipe 200, the traveling locus 2Z in (1) becomes a linear shape (a linear shape similar to a curve) that is bent at the connecting portion between the rear end opening edge 2x of the front tube 2 and the front end opening edge 2y of the rear tube 2. The outer shell B1 or the lining D described above can be constructed.

As shown in FIG. 20 and FIG. 21A, the side wall 2a is a trapezoidal pipe 2, and one pair of side walls 2a, 2a of the pipe 2 facing each other in parallel are formed in a congruent trapezoid. The trapezoidal legs 2t, 2t and the trapezoidal parallel upper and lower parallel edges 2s, 2s are not perpendicular to each other. The pipe 2 can be easily and inexpensively manufactured by cutting the opening edges at both ends of the straight pipe, which extends straight.

The connecting portion between the rear end opening edge 2x of the front tube 2 and the front end opening edge 2y of the rear tube 2 connects between the rear end opening edge 2x of the front tube 2 and the front end opening edge 2y of the rear tube 2. The pipe 2 is connected to the inside and outside of the pipe 2 in a state where water does not flow. That is, when the pipe 2 is installed in the ground 10 by the pipe installation device 1 described later, a rear end opening edge 2x that opens at the side edge that is the other leg 2t of the pair of trapezoidal side walls 2a of the front pipe 2 is formed. By connecting the pair of trapezoidal side walls 2a of the rear pipe 2 with one leg 2t, which is one leg 2t, of the front end opening edge 2y that opens at the side edge by welding, the pipes 2, 2... The traveling locus 2Z has a linear shape that bends at the connecting portion between the rear end opening edge 2x of the front tube 2 and the front end opening edge 2y of the rear tube 2. In other words, by connecting two or more pipes 2, the center line (center axis) 2C of the pipes 2 is extended so as to draw a bending curve that bends at the connecting portion (FIGS. 21B and 21C). The bent pipe 200 as shown in FIG. 2 is formed, and the bent pipe 200 is installed in the ground 10. The lengths of the other leg 2t of the pair of trapezoidal side walls 2a of the pipe 2 before being coupled by the coupling portion and one leg 2t of the pair of trapezoidal side walls 2a of the rear pipe 2 are the same. .. In the present specification, a pipe having a configuration in which each of a pair of parallel side walls of the pipe is formed by a plurality of flat surfaces with a connecting portion as a boundary is referred to as a bent pipe, and one of the pair of parallel pipes of the pipe is parallel to each other. A tube having a structure in which each of the side walls is formed of a curved surface is called a curved tube.

The bending angle of the traveling locus 2Z (the bending angle of the bending curve of the center line 2C of the tube of the bent tube 200) is defined by the rear end opening edge 2x of the front tube 2 and the front end opening edge 2y of the rear tube 2. The angle α formed between the leg 2t of the trapezoidal side wall 2a of the pipe 2 at the connecting portion and the side edges 2s, 2s that are the upper and lower parallel bottoms of the trapezoid becomes gentle as the angle α approaches the right angle, and the angle α is formed. Becomes steeper as the distance from the right angle increases. In other words, the angle between the center line 2C and the center line C that bend at the connecting portion becomes closer to 180 degrees as the angle α makes a right angle, and the center line 2C that bends at the connecting portion as the angle α becomes farther from the right angle The angle with the line C is close to 90 degrees. Therefore, the angle α formed by the trapezoidal side wall 2a of the tube 2 may be determined according to the planned traveling path of the tube 2.

In this way, by using the side wall trapezoidal pipe 2 which can be easily and inexpensively manufactured by obliquely cutting both end opening edges of the straight pipe in which the pipe extends straight, it bends and extends in the ground 10. The outer shell B1 or the lining D can be constructed at low cost. That is, the rear end opening edge 2x that opens at the other edge 2t of the pair of trapezoidal side walls 2a of the front pipe 2 and one leg 2t of the pair of trapezoidal side walls 2a of the rear pipe 2 are formed. By connecting the front end opening edge 2y that opens at a certain edge by welding, a bent pipe 200 can be formed in which the center line 2C of the pipe 2 extends so as to draw a bending curve that bends at the connecting portion. By installing the bending pipe 200 in the ground 10, the outer shell B1 or the lining D that bends and extends in the ground 10 can be constructed at low cost. Further, since the outer shell B1 or the lining D is constructed using the same side wall trapezoidal pipe 2, the manufacturing cost of the plurality of pipes 2 can be reduced.

Embodiment 2 of tube 2
As the side wall trapezoidal tube 2, as shown in FIG. 22, one pair of side walls 2a, 2a of the tube 2 that face each other in parallel are formed in a congruent trapezoid, and the trapezoidal upper bottoms of the side walls 2a are formed. And one leg 2t connecting one ends of the edges 2s, 2s, which are the bottom, are formed by edges 2f parallel to each other and edges 2f perpendicular to each other, and the side walls 2a are trapezoidal parallel to each other. It is also possible to use the tube 2 in which the other leg 2t connecting the other ends of the edges 2s, 2s is formed by the edge 2g that does not form a right angle with the edges 2s, 2s.
In this case, as shown in FIG. 23, when the rear end opening edge 2x of the front pipe 2 is the opening edge formed by the side edge 2f, the rear end opening edge 2x of the front pipe 2 and the rear end opening edge 2x The front end opening edge 2y formed by the edge 2f of the tube 2 is connected. Further, although not shown, when the rear end opening edge 2x of the front pipe 2 is an opening edge formed by the side edge 2g, the rear end opening edge 2x of the front pipe 2 and the side of the rear pipe 2 The front end opening edge 2y formed by the edge 2g is connected.
That is, the traveling locus 2Z of the pipes 2, 2... In the ground 10 is bent at the connecting portion of the rear end opening edge 2x formed by the side edge 2f and the front end opening edge 2y formed by the side edge 2f. become. In other words, at least two rear opening edges 2x of the front tube 2 formed by the side edge 2g and a front end opening edge 2y of the rear tube 2 formed by the side edge 2g are connected to each other. A bent pipe 200 as shown in FIGS. 23(b) and 23(c) is formed which is formed by a pipe, and the center line 2C of the pipe bends and extends so as to draw a bending curve that bends at the connecting portion. The curved pipe 200 will be installed in the ground 10.
In this way, by using the side wall trapezoidal pipe 2 which can be easily and inexpensively manufactured by obliquely cutting the opening edge at one end of the straight pipe in which the pipe extends straight, it bends and extends in the ground 10. The outer shell B1 or the lining D can be constructed at low cost.
Further, since the outer shell B1 or the lining D is constructed by using the same side wall trapezoidal tube 2, the manufacturing cost of the plurality of tubes 2 can be reduced.

Embodiment 3 of tube 2
When two or more side wall trapezoidal pipes 2 are connected to each other, a bent pipe 200 (for example, FIG. 21(b), FIG. (C), FIG. 23(b), and FIG. 23(c), a bent pipe 200 having a configuration in which a plurality of pipes 2 are connected is manufactured in advance, and the bent pipes 200 are sequentially arranged. The outer shell B1 or the lining D may be constructed by connecting them and installing them in the ground 10.
The bent pipe 200 can be easily and inexpensively manufactured by connecting two or more side wall trapezoidal pipes 2. By using such an inexpensive bent pipe 200, the bent pipe 200 bends in the ground 10. The outer shell B1 or the lining D which can be extended can be constructed at low cost.

Embodiment 4 of tube 2
For example, in a tube 2 having a hollow cross-section quadrangular shape surrounded by four side walls as shown in FIG. 20, the other pair of side walls of the side wall trapezoidal tube 2 that face each other in parallel (for example, the upper wall and the lower wall in FIG. 20). 2) and a trapezoidal standing plate 2m, 2m that rises in the same direction from a pair of both side portions of the substrate 2b that are parallel to each other. One of the divided pipe sections 2A having a concave cross section and the other side wall of the other pair of side walls of the side wall trapezoidal tube 2 which face each other in parallel (for example, a rectangular lower wall in FIG. 20) are formed. It is provided with a substrate 2b and the other divided tube body 2B having a concave cross-section, which includes a pair of parallel side portions of the substrate 2b and rising trapezoidal rising plates 2m, 2m that rise in the same direction (see FIG. 24 above). As shown in FIG. 25, the tips of the rising plates 2m, 2m of the one tube segment 2A and the tips of the rising plates 2m, 2m of the other tube segment 2B are connected by a connecting means such as welding. The side wall trapezoidal tube 2 may be used.
The side wall 2a of the side wall trapezoidal pipe 2 (for example, the trapezoidal left wall and the right wall in FIG. 20) is formed by the rising plate 2m of the one pipe division body 2A and the rising plate 2m of the other pipe division body 2B. ..
In other words, the one pipe division body 2A and the other pipe division body 2B are cut along a pair of trapezoidal side walls 2a, 2a of the side wall trapezoidal pipe 2 along parallel edges 2s, 2s of the respective trapezoids. It has the same configuration as the pipe division body having a concave cross-section cut at a portion (a cutting portion parallel to the edges 2s, 2s or a cutting portion not parallel to the edges 2s, 2s).
The divided tubes 2A and 2B can be easily manufactured by bending both side edges of one sheet material in the same direction to form a concave section, so that the tube 2 can be easily and inexpensively manufactured.
In addition, since a plurality of pipes 2 having the same side wall trapezoidal shape can be manufactured by manufacturing a plurality of sets of pipe divisions 2A and 2B of two types, two kinds of pipe divided bodies 2A and 2B and a pipe having the same side wall trapezoidal shape can be manufactured. 2 can be manufactured at low cost.
Further, the pipe division bodies 2A and 2B have a size in which the side wall trapezoidal pipe 2 is divided, and since they are miniaturized, they can be easily transported and handled.
Further, the pipe division bodies 2A and 2B can be connected by welding at the site, and when the front end opening edge 2y of the rear pipe 2 is connected by welding to the rear end opening edge 2x of the front pipe 2, the front pipe It becomes possible to weld one of the divided bodies forming the rear pipe 2 connected to the rear end of the second pipe from the inside of the one divided body, and the one divided body is connected to the rear opening edge of the front pipe 2. 2x can be easily and firmly connected.
Further, by using the pipe 2 formed by the pipe divided bodies 2A and 2B, the outer shell B1 or the lining D that bends and extends in the ground 10 can be constructed at low cost.

A1 main line tunnel (first tunnel),
A2 ramp tunnel (second tunnel, another tunnel), B starting base, B1 outer shell, C pit, D lining, D1, D2... Construction area, E1 ground, G branch junction,
2 tubes, 200 bent tubes.

Claims (9)

Starting base construction steps for constructing a starting base outside the tunnel,
A lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground ,
In the starting base construction step, after constructing the outer shell of the starting base that starts from the tunnel and reaches the tunnel, the starting base is constructed by excavating the ground between the outer shell and the outer peripheral surface of the tunnel. ,
The outer shell is a tunnel widening method characterized by being constructed by installing pipes underground . Starting base construction steps for constructing a starting base outside the tunnel,
A tunnel construction step for constructing a tunnel extending from the starting base along the extension direction of the tunnel,
A lining construction step for constructing a lining extending from the tunnel along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground ,
In the starting base construction step, after constructing the outer shell of the starting base that starts from the tunnel and reaches the tunnel, the starting base is constructed by excavating the ground between the outer shell and the outer peripheral surface of the tunnel. ,
The outer shell is a tunnel widening method characterized by being constructed by installing pipes underground . Starting base construction steps for constructing a starting base outside the tunnel,
A lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
The tunnels are a first tunnel and a second tunnel that branch and join,
In the starting base construction step, a starting base is constructed outside at least one of the first tunnel and the second tunnel,
Wherein in the lining step, the first tunnel and the first tunnel and the second tunnel circumferential features and to belt that was constructed lining extending along as a branching and joining portion between the second tunnel Channel widening method. Starting base construction steps for constructing a starting base outside the tunnel,
A tunnel construction step for constructing a tunnel extending from the starting base along the extension direction of the tunnel,
A lining construction step for constructing a lining extending from the tunnel along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
The tunnels are a first tunnel and a second tunnel that branch and join,
In the starting base construction step, a starting base is constructed outside at least one of the first tunnel and the second tunnel,
Wherein in the lining step, the first tunnel and the first tunnel and the second tunnel circumferential features and to belt that was constructed lining extending along as a branching and joining portion between the second tunnel Channel widening method. In the lining construction step, a lining extending along the circumferential direction of the first tunnel and the second tunnel and a lining extending along the circumferential direction of the first tunnel so as to be continuous in the extending direction of the first tunnel. The tunnel widening method according to claim 3 or 4 , wherein Starting base construction steps for constructing a starting base outside the tunnel,
A lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
The end of another tunnel from the said tunnel, characterized and to belt tunnel widening method that is connected to the inner lining, which is constructed in the lining step. Starting base construction steps for constructing a starting base outside the tunnel,
A tunnel construction step for constructing a tunnel extending from the starting base along the extension direction of the tunnel,
A lining construction step for constructing a lining extending from the tunnel along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
The end of another tunnel from the said tunnel, characterized and to belt tunnel widening method that is connected to the inner lining, which is constructed in the lining step. Starting base construction steps for constructing a starting base outside the tunnel,
A lining construction step for constructing a lining extending from the starting base along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
As the pipe, a pipe having a square cross section and a trapezoidal side wall is used,
The lining is such that a plurality of the pipes are sequentially connected to each other in the front and rear and installed in the ground so that a traveling trajectory in the ground is a rear end opening edge of the front pipe and a front end opening edge of the rear pipe. features and to belt tunnel widening method that was constructed by folding tube to be a linear bend at the junction. Starting base construction steps for constructing a starting base outside the tunnel,
A tunnel construction step for constructing a tunnel extending from the starting base along the extension direction of the tunnel,
A lining construction step for constructing a lining extending from the tunnel along the circumferential direction of the tunnel,
By excavating the ground between the tunnel and the lining and then dismantling the tunnel portion surrounded by the lining, a widening step of widening the tunnel is provided,
The lining is constructed by installing the pipe in the ground,
As the pipe, a pipe having a square cross section and a trapezoidal side wall is used,
The lining is such that a plurality of the pipes are sequentially connected to each other in the front and rear and installed in the ground so that a traveling trajectory in the ground is a rear end opening edge of the front pipe and a front end opening edge of the rear pipe. A tunnel widening method characterized by being constructed by a bent pipe that is a linear shape that bends at a connecting portion .

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