JP2016003488A - Invert concrete construction method, and tunnel construction method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an invert concrete construction method and a tunnel construction method using the same, capable of closing a tunnel at an early stage and stabilizing the tunnel early.SOLUTION: Invert concrete is formed by forming a pilot tunnel A along an extension direction of a tunnel T scheduled to be constructed at the bottom of a planned construction site TR of the tunnel T, subsequently making a tube C with rectangular cross sections progress from the pilot tunnel A into the underground 10, installing the tube C in the underground 10 and filling the tube C installed in the underground 10 with concrete C1.

Description

  The present invention relates to an invert concrete construction method for constructing a tunnel, and a tunnel construction method using the method.

  In general, when constructing a tunnel, in order to prevent the natural ground from collapsing into the tunnel cavity formed by excavating the natural ground, after excavating the natural ground, the cross-sectional arch shape of the tunnel cavity (projecting upward) A support work is constructed on the inner wall surface formed in an arch shape that curves so as to be further, and there is insufficient support capacity on both leg sides of the cross-section arch shape of the support work (an arch shape that curves so as to protrude upward), etc. In order to prevent the cross-sectional shape of the tunnel cavity from being deformed by the excavation, the bottom of the tunnel cavity is excavated, and the bottom of the tunnel cavity is changed to a cross-section arch-shaped (arch shape that curves so as to protrude downward) After forming, cast concrete by placing concrete on the bottom or installing precast concrete to close the tunnel. So that stabilized panel (for example, Patent Document 1).

JP 2013-28898 A

However, in the conventional invert concrete construction method described above, it is necessary to construct the invert concrete after forming the tunnel cavity, and it is impossible to construct the invert concrete in advance before the tunnel cavity is formed. Therefore, there was a problem that the tunnel could not be closed early and the tunnel could not be stabilized early.
The present invention provides an invert concrete construction method capable of closing a tunnel at an early stage and achieving early stabilization of the tunnel, and a tunnel construction method using the method.

In the invert concrete construction method according to the present invention, after forming a guide pit along the extension direction of the tunnel planned to be constructed at the bottom of the tunnel planned construction site, a pipe having a rectangular cross section is advanced from the guide pit into the ground. Invert concrete was formed by installing concrete pipes in the underground and filling the concrete pipes in the underground, so that the tunnel can be closed early and the tunnel can be stabilized early. Become.
Invert concrete is formed in a plate shape that functions as a preceding lining with the same thickness of the cross-sectional arch shape that extends in the tunnel extension direction, so that the thickness is equal in the tunnel width direction and tunnel extension direction. Invert concrete that functions as a preceding lining with uniform strength can be formed.
Invert concrete was formed by filling concrete in the pipe where the support was installed after installing the support in the pipe installed in the ground, so that the support and lining concrete were integrated. Invert concrete with high pressure resistance can be constructed.
In addition, the shaft is located at the center between the left and right widths of the tunnel to be constructed at the bottom of the planned construction site of the tunnel and extends along the extension direction of the tunnel to be constructed. A plurality of pipes installed in the ground so as to straddle the guide tunnel and the underground position corresponding to the lower end position of the inner wall of the tunnel cavity are adjacent to each other along the extension direction of the tunnel to be constructed. Since it is arranged, the pipe can be installed in the ground through one guide shaft provided to extend along the extension direction of the tunnel, and the number of guide shafts to be formed can be minimized. The construction cost can be reduced.
In the tunnel construction method according to the present invention, after the invert concrete was formed by the above-described invert concrete construction method, the tunnel main shaft was formed by excavating the ground above the invert concrete formed in the ground. It is possible to close early and stabilize the tunnel early, and since invert concrete has already been constructed before excavation work of the tunnel cavity of the tunnel main tunnel, The amount of ground surface settlement during excavation work for forming the cavity can be reduced.
In addition, if the work for forming invert concrete by the above-described invert concrete construction method and the work for excavating the ground above the place where the invert concrete is to be formed to form the tunnel cavity are performed simultaneously, the tunnel As a result, the tunnel construction method can shorten the tunnel construction time.
In addition, the upper half of the tunnel is excavated to form the upper half cavity of the tunnel construction site, the upper support is formed on the inner wall surface of the upper half cavity of the tunnel, and the bottom of the upper half cavity of the tunnel is formed. After forming the upper half support on the inner peripheral surface of the upper half cavity of the tunnel by closing the bottom half of the tunnel and closing the upper half cavity of the tunnel, Excavation of natural ground between the ends of the invert concrete and the tunnel cavity so that the lower end of the upper support formed on the inner wall of the upper half cavity of the tunnel and the end of the invert concrete are connected. The tunnel is closed by forming a supporting work on the lower end side of the inner wall, and then the bottom supporting work provided at the bottom of the upper half cavity of the tunnel is removed, and the excavation work that excavates the lower half of the tunnel Since the tunnel main shaft was formed by removing the guide shaft, the upper half cavity of the tunnel and the tunnel can be closed early, and the stability of the tunnel support structure can be improved and the safety is high. A tunnel construction method can be realized.

Process drawing of a tunnel construction method (Embodiment 1). Process drawing of a tunnel construction method (Embodiment 1). Process drawing of a tunnel construction method (Embodiment 1). The enlarged view of an invert part (embodiment 1). The enlarged view of an invert part (embodiment 2). AA sectional view of Drawing 5 (embodiment 2). Sectional drawing of a pipe installation apparatus (embodiment 3). The perspective view which showed the head part of the top pipe (embodiment 3). The figure which looked at the excavation machine inside a pipe | tube from the blade-tip side of a guide blade pipe | tube (Embodiment 3). The figure which shows the installation method of the pipe | tube in the ground (Embodiment 3). A perspective view showing a pipe installation device (embodiment 3). An exploded perspective view showing a pipe installation device (embodiment 3). Sectional drawing which shows the pipe installation apparatus provided with the excavation machine rocking | fluctuation drive device (Embodiment 8). (A) is the perspective view which showed the head part of the head pipe, (b) Sectional drawing which shows the relationship between a pair of 2nd excavation bit groups (Embodiment 9). (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 | position state at the time of collection | recovery of a rotary excavation body (Embodiment 9).

Embodiment 1
The invert concrete construction method in the tunnel construction method of Embodiment 1 is a method of constructing invert concrete in advance before forming the tunnel cavity, and as shown in FIG. 1 and FIG. After forming the guide pit A along the extension direction of the tunnel T to be constructed at the bottom of the ground TR, the pipe C is advanced from the guide pit A to the ground 10 to install the pipe C in the ground 10 and the ground. Invert concrete B is formed by filling concrete C1 into the pipe C installed in the middle 10.
Hereinafter, a tunnel construction method using the inverted concrete construction method will be described with reference to FIGS. In addition, the dashed-two dotted line of Fig.1 (a); (b) shows the cross-sectional shape of the tunnel T to be constructed.
The tunnel construction method according to Embodiment 1 includes a shaft formation step, an invert concrete formation step, and a tunnel main shaft formation step. In the shaft formation step, the tunnel scheduled to be constructed at the bottom of the planned construction site TR of the tunnel T After forming the guide shaft A along the extending direction of T, in the invert concrete forming step, the pipe C is advanced from the guide shaft A to the ground to install the tube C in the ground 10 and installed in the ground 10 The invert concrete B of the tunnel T is formed by filling the concrete pipe C into the pipe C, and then the ground above the invert concrete B formed in the underground 10 is excavated in the tunnel main shaft forming step. To form the main tunnel.

In the shaft formation step, as shown in FIG. 1A, at the bottom of the construction site TR of the tunnel T, the center side between the left and right widths of the tunnel T to be constructed, that is, between the left and right widths of the tunnel T to be constructed. A guide shaft A is formed that extends along the extension direction of the tunnel T to be constructed and is located at the center or substantially the center of the tunnel.
The horizontal width of the tunnel T means the horizontal width of the tunnel cross section (see FIG. 3C) orthogonal to the extending direction of the tunnel T.
The guide shaft A is formed by a known tunnel construction method such as a NATM construction method.

In the invert concrete formation step, the pipe C installed in the underground 10 so as to straddle the underground pit A and the underground position corresponding to the lower end position of the inner wall of the tunnel cavity portion formed later through the sidewall of the underground mine A. Are arranged in the underground 10 so as to be adjacent along the extending direction of the tunnel T to be constructed.
The pipe C has a quadrangular cross section when the pipe is cut along a plane orthogonal to the center line (center axis) of the pipe as described in the third embodiment, that is, a bent pipe or a fold having a square cross section. Use curved pipes.
That is, as shown in FIG. 1A to FIG. 1C, the cross-sectional arch shape of the tunnel cavity formed later and the tunnel A through the lower end portion ALe of the left side wall AL of the tunnel A (projecting upward) The pipe C installed so as to straddle the underground position corresponding to the lower left end position DLe of the inner wall TU of the inner wall TU of the inner wall TU in contact with or close to each other along the extending direction of the tunnel T to be constructed As shown in FIGS. 2 (a) and 2 (b), a plurality of tunnels are formed in the underground 10 so as to fit with each other, and are formed behind the guide shaft A via the lower end portion ARe of the right side wall AR of the guide shaft A. The pipe C installed so as to straddle the underground position corresponding to the right lower end position DRe of the inner wall TU having a cross-sectional arch shape (an arch shape curved so as to protrude upward) in the hollow portion is an extension of the tunnel T to be constructed. Arranged in the underground 10 so as to be adjacent along the direction That.

The installation work of the pipe C to the underground 10 may be performed using, for example, pipe installation means such as the pipe installation apparatus 1 described later.
The tube C is configured by, for example, a tube C configured by a plurality of tubes 2 configured by sequentially connecting subsequent tubes 2 to the rear side in the advancing direction of the first tube 2 described later, or a single tube 2. Tube C.
Note that the lower end portion ALe of the left side wall AL of the guide shaft A is an inner wall surface of a cross-sectional arch shape (arch shape curved so as to protrude upward) perpendicular to the extending direction of the guide shaft A shown in FIG. The lower left end ARe of the right side wall AR of the guide shaft A refers to the lower right end portion of the inner wall surface having a cross-sectional arch shape orthogonal to the extending direction of the guide shaft A shown in FIG.
The left lower end position DLe of the inner wall of the tunnel cavity portion refers to the left lower end position of the inner wall TU having an arched cross section perpendicular to the extending direction of the tunnel cavity portion shown in FIG. The position DRe refers to the right lower end position in the inner wall TU having an arched cross section perpendicular to the extending direction of the tunnel cavity shown in FIG.

After the pipe C is installed in the underground 10 with the guide mine A as the starting mine, the concrete C1 is filled (placed) in the pipe C installed in the underground 10.
The concrete C1 filling operation into the pipe C installed in the underground 10 is the rear end opening of the pipe C installed in the underground 10 and the concrete C1 is piped from the rear end opening remaining in the guide shaft A. What is necessary is just to press-fit in C.

  And as shown in FIG. 2 (c); FIG. 4, it corresponds to the left lower end position DLe of the arch-shaped inner wall TU of the tunnel cavity formed later with the guide pit A through the left side wall AL of the guide pit A. An arch-shaped inner wall of the tunnel cavity formed behind the mine shaft A through the rear end opening of the left pipe C installed in the underground 10 so as to straddle the underground position and the right side wall AR of the mine shaft A Concrete C1 is placed on the floor surface of the guide shaft A between the rear end opening of the right pipe C installed in the underground 10 so as to straddle the underground position corresponding to the right lower end position DRe of the TU, By connecting the rear end opening of the left pipe C and the rear end opening of the right pipe C facing each other in the shaft A by the concrete C1, the left lower end position DLe of the arch-shaped inner wall TU of the tunnel cavity portion And the invert converter straddling the lower right position DRe of the inner wall TU REITs B is formed.

  In addition, it is installed in the underground 10 so as to straddle the guiding hole A and the underground position corresponding to the lower left end position DLe of the arch-shaped inner wall TU of the tunnel cavity portion formed later through the left wall AL of the guiding mine A. The underground position corresponding to the right lower end position DRe of the arch-shaped inner wall TU of the tunnel cavity portion formed later with the guide pit A and the rear end opening of the left pipe C and the right side wall AR of the guide pit A A connecting pipe (not shown) is installed between the rear end opening of the right pipe C installed in the underground 10 so as to straddle the pipe, and a rear end opening end face of the left pipe C and one end of the connecting pipe (not shown). The end faces are connected to each other by connecting means such as welding, and the rear end opening end face of the right pipe C and the other end opening end face of the connecting pipe (not shown) are connected to each other. After connecting by means, the contact is made through an inlet formed so as to penetrate the wall of the connecting pipe. By filling concrete C1 to the connecting tube may be formed invert concrete B spanning the lower right end position DRe the lower left end position DLe inner wall TU inner wall TU arched tunnel cavity.

  As described above, it is installed so as to straddle the underground position corresponding to the left lower end position DLe and the underground position corresponding to the right lower end position DRe of the arch-shaped inner wall TU of the tunnel cavity in the tunnel T to be constructed, Invert concrete B is formed by filling concrete C1 into a plurality of pipes C arranged in the underground 10 so as to be adjacent to each other along the extension direction of the tunnel T to be constructed. That is, an invert concrete B is formed which functions as a plate-like prelining (preceding lining) having a cross-sectional arch shape extending in the extending direction of the tunnel T (an arch shape curved so as to protrude downward). .

  The tunnel main shaft forming step includes a tunnel upper half forming step and a tunnel lower half forming step.

  In the tunnel upper half formation step, the ground half portion of the tunnel upper half of the planned construction site TR of the tunnel T is excavated to form the tunnel upper half cavity E and the upper half cavity E above the inner peripheral surface of the tunnel upper half cavity E. The semi-supporting work E1 is formed, and the upper half cavity E of the tunnel is quickly closed by the upper half supporting work E1. The upper half support E1 is formed by an upper support E2 and a bottom support E3.

  For example, a plurality of steel supporters are installed at predetermined intervals along the extension direction of the tunnel T on the inner wall surface of the cross-sectional arch shape of the upper half cavity E of the tunnel (the arch shape curved so as to protrude upward) After the concrete is sprayed to the inner wall surface of the tunnel upper half cavity E and the steel support, and then the upper support E2 by the NATM method of fixing the sprayed concrete to the natural ground with the lock bolt, By constructing a temporary bottom support E3 to be removed later on the bottom surface of the tunnel upper half cavity E and forming the upper half support E1 on the inner peripheral surface of the tunnel upper half cavity E, the tunnel upper half The cavity E is closed early (see FIG. 3A).

  In this way, the upper half cavity E can be prevented from being deformed by the pressure from the ground because the upper half cavity E of the tunnel is closed early by the upper half support E1, and the upper half cavity of the tunnel The cross-sectional shape of the part E can be kept stable.

  The bottom support E3 of the tunnel upper half cavity E is, for example, between the left and right lower ends of the upper support E2 having an arched cross section formed on the inner wall surface of the tunnel upper half cavity E (that is, the left lower end E2Le). Steel column-shaped invert struts installed on the bottom surface of the upper half cavity portion E of the tunnel so as to straddle between the right lower end portion E2Re) and intermittently at predetermined intervals along the extension direction of the tunnel T. The one end of each invert strut is connected to the left lower end E2Le of the upper support E2 formed on the inner wall surface of the tunnel upper half cavity E, and the other end of each invert strut is connected to the tunnel upper half cavity It is comprised so that it may be connected to the lower right end part E2Re of the upper support E2 formed in the inner wall face of E (refer Fig.3 (a)).

After forming the tunnel upper half cavity E, which was closed early by the upper half support E1, excavate a natural ground between the lower end of the inner wall of the tunnel upper half cavity E and the end of the invert concrete B Thus, the lower end of the inner wall surface of the tunnel cavity E is formed so as to connect the lower end of the upper support E2 formed on the inner wall surface of the upper half cavity E of the tunnel and the end of the invert concrete B. To do.
That is, in the lower half formation step of the tunnel, as shown in FIG. 3 (b), the ground between the lower left end portion E2Le of the upper support E2 of the upper half cavity portion E of the tunnel and the left end portion BLe of the invert concrete B is formed. By excavating to form a working space FL, the left inner wall surface of the lower tunnel half cavity F, which is the lower left side of the inner wall surface of the tunnel cavity, is exposed, and the inner wall surface of the upper tunnel half cavity E is exposed. A support E4 on the lower left side of the inner wall surface of the tunnel cavity is formed so as to connect the left lower end E2Le of the formed upper support E2 and the left end BLe of the invert concrete B.
Further, in the lower tunnel half-forming step, as shown in FIG. 3 (b), a natural ground between the lower right end E2Re of the upper support E2 of the upper tunnel half cavity E and the right end BRe of the invert concrete B is formed. By excavating to form a working space FR, the inner wall surface on the right side of the lower half cavity portion F which is the lower right side of the inner wall surface of the tunnel cavity portion is exposed, and the inner wall surface of the upper half cavity portion E of the tunnel is exposed. A support E5 on the lower right side of the inner wall surface of the tunnel cavity is formed so as to connect the lower right end E2Re of the formed upper support E2 and the right end BRe of the inverted concrete B.

The support E4 on the lower left side and the support E5 on the lower right side of the inner wall surface of the tunnel cavity are, for example, the lower end (the lower left end) of the upper support E2 provided on the inner wall surface of the tunnel upper half cavity E. E2Le or the right lower end E2Re) and the steel support such as H-shaped steel installed so as to straddle between the end of the invert concrete B (the left end BLe or the right end BRe) along the extending direction of the tunnel T The upper end of each steel support is connected to the lower end of the upper support E2 of the upper half cavity E of the tunnel, and the lower end of each steel support is arranged intermittently at predetermined intervals. Is connected to or placed on the upper surface of the end portion of the pipe C constituting the invert portion B, and concrete is sprayed on the inner wall surface of the lower half cavity portion F of the tunnel and the steel support, and then the sprayed concrete is Natural mountain by rock bolt Formed by shoring by fixing to NATM method.
As described above, the support T (E2; E4; E5) is formed in the portion that becomes the cross-sectional arch-shaped inner wall surface TU of the tunnel cavity portion before the tunnel lower half cavity portion F is formed. It is closed early (see FIG. 3B).

  Thereafter, by removing the temporary bottom support E3 provided on the bottom surface of the upper half cavity E of the tunnel, excavating the lower half of the tunnel, and removing the guide shaft A, the lower half of the tunnel A cavity F was formed, and a support (E2; E4; E5) was formed on the inner wall TU having an arcuate cross section of the tunnel cavity formed by the upper half cavity C and the lower tunnel half cavity F. It becomes a structure (refer FIG.3 (c)).

  Invert concrete B reaches a position where the left end protrudes to the left and above the left lower end of the lower left supporter E4 (the lower left lower end of the tunnel cavity support), and the right end is the right Since it was installed in the underground 10 so as to reach the position protruding to the right side and the upper side of the lower right side of the lower support E5 (the lower right end of the tunnel cavity support), the tunnel cavity support The area that receives the force transmitted through both lower ends becomes larger, and the force is easily distributed to the ground. That is, the load applied to the invert concrete B is easily distributed to the natural ground. Further, after the construction of the invert concrete B, the left lower end of the support work E4 on the lower left side and the right lower end of the support work E5 on the lower right side are placed on or joined to both ends in the left-right width direction of the invert concrete B. It becomes easy.

  Then, after installing a waterproof sheet (not shown) on the inner surface of the support wall (E2; E4; E5) formed on the inner wall surface TU having a cross-sectional arch shape in the tunnel cavity, a reinforcing bar (not shown) is placed inside the waterproof sheet. The tunnel main pit is constructed by placing and placing concrete inside the support using a centle (lining form) outside the figure to form the lining concrete, and the tunnel main pit and invert concrete B A tunnel T constituted by the above is constructed.

According to the invert concrete construction method of the first embodiment, the guide shaft A is formed at the bottom of the planned construction site TR of the tunnel T along the extension direction of the tunnel T planned to be constructed. The underground position corresponding to the lower left position DLe and the lower right position DRe corresponding to the lower left position DLe of the inner wall TU having a cross-sectional arch shape in the tunnel cavity of the tunnel T to be constructed from A to the ground 10 Invert concrete B that functions as prelining (advance lining) before forming the tunnel cavity by filling the concrete C1 into the pipe C after installing the pipe C installed so as to straddle. Can be formed in advance, so that both legs of the cross-section arch-shaped supporter constructed on the inner wall of the cross-section arch-shape of the tunnel cavity can be By binding to concrete B, will be the tunnel T is closing prematurely, in tunnel construction, it is possible to achieve early stabilization of the tunnel T. According to the first embodiment, the tunnel T can be closed at an early stage even in the construction of a tunnel having a large cross section or a flat cross section, so that early tunnel stabilization can be realized and a safe tunnel construction method can be provided. It becomes like this.
Conventionally, there is a method of constructing a tunnel cavity after constructing the bottom support before forming the tunnel cavity, and then constructing invert concrete that functions as a lining (lining). In this case, it is necessary to perform the support work and the lining work separately before and after the work for forming the tunnel cavity, and there is a problem that the construction period cannot be shortened.
In contrast to this, in the first embodiment, the concrete C1 is filled into the pipe C installed as a concrete formwork without performing a support work before forming the tunnel cavity, thereby providing a prelining (preceding lining). Since the functioning invert concrete B is formed in advance, it is not necessary to perform lining after the tunnel cavity is formed, and the construction period can be shortened.
Further, as the pipe C, a curved pipe or a bent pipe having a square cross section when the pipe is cut along a plane orthogonal to the center line (center axis) of the pipe is used, and the pipe C is used as an invert concrete of the underground 10. Since the invert concrete B was constructed by filling the concrete C1 into the pipe C using the pipe C installed in the ground as a concrete formwork, it is extended in the extension direction of the tunnel T. Invert concrete B that functions as a prelining (advanced lining) composed of a plate-like body having a cross-sectional arch shape (an arch shape that curves so as to protrude downward) and having the same thickness can be easily constructed. That is, since the invert concrete B is formed in a plate shape that functions as a pre-lining (preceding lining) having an equal cross-sectional arch shape extending in the extending direction of the tunnel T, the width direction of the tunnel T and the tunnel T In the extending direction, invert concrete B that functions as a prelining (preceding lining) having a uniform thickness and a uniform strength can be formed. Moreover, since the pipe C is used as a concrete formwork, the invert concrete B having a thickness corresponding to the thickness dimension of the pipe C can be easily constructed by using the pipe C having a different thickness dimension. Become.
In addition, at the bottom of the planned construction site TR of the tunnel T, the tunnel T to be constructed is located at the center side between the left and right widths of the tunnel T to be constructed, that is, at the center or almost the center between the left and right widths of the tunnel T to be constructed. The underground shaft 10 is formed so as to extend over the side wall of the tunnel A and the underground position corresponding to the lower end position of the inner wall TU of the tunnel cavity portion. Since a plurality of pipes C installed in the underground 10 are arranged so as to be adjacent to each other along the extension direction of the tunnel T to be constructed, one pipe C provided to extend along the extension direction of the tunnel T is provided. Since the pipe C can be installed in the underground 10 through the guide shaft A, and the number of guide shafts A to be formed can be minimized, the construction cost can be reduced.
In the first embodiment, at the bottom of the planned construction site TR of the tunnel T, the center side between the left and right widths of the tunnel T to be constructed, that is, the middle or almost the middle between the left and right widths of the tunnel T to be constructed. Although an example in which the guide shaft A extending along the extension direction of the tunnel T scheduled to be constructed is shown, in the present invention, the construction scheduled to be located on the left side or the right side between the left and right widths of the tunnel T scheduled to be constructed. One guide shaft A extending along the extending direction of the tunnel T may be formed.
Further, in the present invention, the left side shaft is formed on the lower left side of the tunnel T to be constructed at the bottom of the planned construction site TR of the tunnel T, and the tunnel T to be constructed is constructed at the bottom of the planned construction site TR of the tunnel T. A right guide shaft is formed on the lower right side, a pipe C is installed in the underground 10 so as to straddle the left guide shaft and the right guide shaft, and the concrete C1 is placed in the pipe C installed in the underground 10 in this way. The invert concrete B may be constructed by filling.

According to the tunnel construction method of the first embodiment, after forming the invert concrete B by the above-described invert concrete construction method, excavating the natural ground above the invert concrete B formed in the underground 10 to form the tunnel main shaft. As a result, the tunnel T can be closed early, the tunnel T can be stabilized early, and the invert concrete B is formed before the excavation work for forming the tunnel cavity of the tunnel main shaft is performed. As a result, the invert concrete B functioning as a pre-lining (advanced lining) has already been constructed before the excavation work of the tunnel cavity of the tunnel main mine, so that the tunnel cavity of the tunnel main mine is formed. The amount of land subsidence during excavation can be reduced.
When forming the tunnel cavity, first, the tunnel upper half cavity E is formed, and the upper half support E1 is formed on the inner peripheral surface of the tunnel upper half cavity E, thereby forming the tunnel upper half cavity E. Therefore, when the tunnel T having a relatively large cross section is constructed, the stability of the tunnel support structure can be improved, and a highly safe tunnel construction method can be realized.
Furthermore, since the work for excavating and forming the lower half cavity F of the tunnel can be performed in a state where the tunnel T is closed, a highly safe tunnel construction method can be realized.

Embodiment 2
The invert concrete construction method in the tunnel construction method of the second embodiment is a method in which invert concrete is constructed in advance before forming the tunnel cavity, and the tunnel T scheduled to be constructed at the bottom of the construction site TR of the tunnel T is constructed. After forming the guide shaft A along the extending direction, the pipe C is advanced from the guide shaft A to the ground 10 until the tube C is installed in the ground 10. In Embodiment 2, an invert concrete BX is formed by installing a support in the pipe C installed in the underground 10 and then filling the pipe in which the support is installed with concrete.
Hereinafter, a tunnel construction method using the inverted concrete construction method will be described based on FIG. 5 and FIG. 6. Note that the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
The tunnel enforcement method according to the second embodiment includes a shaft formation step, an invert concrete formation step, and a tunnel main shaft formation step. After forming the guide shaft A along the extending direction of T, in the invert portion forming step, the tube C is advanced from the guide shaft A to the underground 10 and installed in the underground 10 and installed in the underground 10 Before the concrete C1 is filled (placed) in the pipe C, the support CX is installed in the pipe C installed in the underground 10 and then the concrete C1 is placed in the pipe C in which the support CX is installed. Is filled (placed) to form invert concrete BX with built-in support CX. Drilled above the natural ground of Ried BX a tunnel Honko.

In Embodiment 1, the invert concrete B was formed by filling the concrete C1 in the pipe C installed in the underground 10. That is, in the first embodiment, the support concrete is omitted and the invert concrete B functioning as a prelining (preceding lining) is constructed, but in the second embodiment, the vehicle starts from the guide shaft A and enters the underground 10. The invert concrete BX in which the support CX inserted and installed in the installed pipe C and the lining concrete formed by filling the pipe C with concrete C1 is integrally formed is constructed. That is, the invert concrete BX constituted by installing the support CX inside the invert concrete B described in the first embodiment is constructed.
As the support CX inserted and installed in the pipe C, for example, a shape steel such as H-shaped steel (see FIG. 5; FIG. 6), a reinforcing bar, an invert strut, or the like may be used.
Further, in order to install the support CX in the pipe C so that the concrete cover thickness is secured around the support CX, a support positioning positioning member (spacer) CY as shown in FIG. 6 may be used.
For example, as shown in FIG. 6, the support work positioning installation member CY includes an upper horizontal frame material CY1 and a lower horizontal frame material CY2 provided at intervals corresponding to the height dimension of the H-shaped steel to be the support work CX, If a support positioning positioning member CY that is provided with a left vertical frame CY3 and a right vertical frame CY4 that connect ends of the upper horizontal frame material CY1 and the lower horizontal frame material CY2 and is configured in a shape like a torii is used. Good. Such a support positioning positioning member CY is installed in a fixed state in the pipe C for each pipe C, and after the installation of the pipe C to the ground 10 is finished, the upper horizontal frame material CY1 and the lower horizontal frame material CY2 The H-shaped steel as the supporting work CX is inserted into the space surrounded by the left vertical frame CY3 and the right vertical frame CY4 so that the H-shaped steel as the supporting work CX is positioned at the center of the cross-section hollow space of the pipe C. After filling the pipe C with the concrete C1, the support CX can be installed in the pipe C so that the concrete cover thickness is secured around the support CX.

According to the second embodiment, after the support CX is installed in the pipe C installed in the ground 10, the concrete C1 is filled in the pipe C in which the support CX is installed. Invert concrete BX combined with lining concrete that functions as lining (advanced lining) can be constructed at the same time, and support concrete CX and lining concrete that functions as prelining (advanced lining) are integrated. The construction time of the inverted concrete BX can be shortened and the construction cost can be reduced.
In addition, according to the second embodiment, the invert concrete BX having a large pressure resistance in which the supporting work CX and the lining concrete functioning as a prelining (advanced lining) are integrated can be constructed. -Invert concrete BX that is hard to deform even when subjected to earth pressure from a natural rock can be constructed in a place where the natural rock tends to fluctuate in a soft rock formation.

Embodiment 3
An example of the above-described tube installation device 1 will be described with reference to FIGS.
As shown in FIG. 7, 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 stand 90, and a pressing member 110. In the following, the upper side in FIG. 7 is defined as the head or front side of the tube 2 or the tube installation device 1, the lower side in FIG. 7 is defined as the rear side of the tube 2 or the tube installation device 1, and the left and right sides in FIG. It will be defined as the left and right sides of the tube 2 and the tube installation device 1, and the upper and lower sides in the direction orthogonal to the paper surface of FIG. In FIG. 8, the front side, the rear side, the left side, the right side, the upper side, and the lower side of the pipe 2 and the pipe installation device 1 are clearly shown.

The tube 2 constituting the tube C is a curved tube formed so as to bend and extend so as to draw an arc (the center line of the tube (the center point of the cross section perpendicular to the tube extending direction is along the tube extending direction). A continuously connected line) is a curved tube) or a bent tube. The bent pipe is a pipe configured by connecting a rear end opening edge of one pipe and a front end opening edge of the other pipe by connecting means such as welding, and the one and the other pipes are A pair of side walls opposing each other in parallel is formed into a congruent trapezoid, and the trapezoid of the side walls is formed into a side wall trapezoid whose parallel edges are parallel to the center line of the pipe. The trapezoid of the side wall of one pipe and the trapezoid of the side wall of the other pipe constituting the bent pipe are not perpendicular to the angle formed by each leg of the trapezoid and the edges of the trapezoid parallel to the upper and lower bases. The bent pipe is formed in a trapezoidal shape, and the bent pipe includes a rear-end opening edge that opens at the edge that is a leg of a pair of trapezoidal side walls of one pipe and a side that is a leg of a pair of trapezoidal side walls of the other pipe The front end opening edge that opens at the edge is connected by welding or the like. In the present specification, a pipe having a configuration in which each of a pair of side walls parallel to each other is formed of a plurality of planes with a connecting portion as a boundary is referred to as a bent pipe, and a pair of pipes parallel to each other is referred to as a bent pipe. A tube having a configuration in which each side wall is formed of a curved surface is referred to as a curved tube.
These bent pipes and bent pipes are formed by, for example, pipes having a quadrangular cross section when the pipe is cut along a plane orthogonal to the center line (center axis) of the pipe.
As the pipe 2, for example, a steel pipe is used. When the tube 2 is a curved tube having a rectangular cross section, the length of the tube (the length in the direction along the center line of the tube) is 1500 mm, and the width of the tube (the rectangular cross section). The length of the long side) is 1240 mm, the vertical width of the tube (the length of the short side of the rectangular cross section) is 690 mm, and the thickness of the tube is 16 mm. The size of each tube forming the bent tube is, for example, when the tube is a tube having a rectangular cross section, the length of the tube 2 (the length in the direction along the center line of the tube) is a trapezoid. 463 mm on the upper and lower sides of the side wall of the tube, 497 mm on the lower bottom side of the trapezoidal side wall, the horizontal width of the tube is 1240 mm, the vertical width of the tube is 690 mm, and the wall thickness of the tube is 16 mm.
Then, a plurality of bent pipes are sequentially connected and installed in the underground 10 so that a tube C that bends and extends so as to draw an arc is constructed in the underground 10 or a plurality of bent pipes are sequentially connected. By being installed in the underground 10, a pipe C is constructed in the underground 10 that is bent at the connecting portion and extends so as to approximate an arc.
The pipe C constructed in the underground 10 by the pipe installation device 1 and the pipe installation method of the third embodiment includes a pipe 2 positioned at the head (hereinafter referred to as a head pipe) and a plurality of subsequent pipes 2 (hereinafter referred to as subsequent pipes). And). For example, the pipe C is formed by a head pipe 6 (see FIG. 7; FIG. 10 and the like) positioned at the head and a plurality of subsequent succeeding pipes 7 (see FIG. 10) provided so as to follow the head pipe 6. The rear end opening edge and the front end opening edge are constructed by a plurality of pipes 6; 7;

Hereinafter, the configuration of the pipe installation device 1 will be described with reference to FIGS. 7 to 9.
For example, as shown in FIG. 7, the leading pipe 6 has a guide blade tube that functions as a guide blade provided at the tip of the tube 6x and the tube 6x. And 9. The guide blade tube 9 is a tube including a blade portion 14 in which one open end edge 13 of the tube is formed sharply.
The leading tube 6 is formed by connecting the other opening end of the guide blade tube 9 and the opening end 8 at the tip of the tube 6x. In this case, for example, the outer diameter of the guide blade tube 9 is larger than the outer diameter of the tube 6x, and the inner periphery of the tube at the opening end surface 15 is located on the other opening end surface 15 side of the guide blade tube 9. The surface side is shaved and a step is provided to form a fitting hole 16 into which the opening end 8 at the tip of the tube 6x is fitted. Then, the opening end 8 at the tip of the tube 6x is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9, and both of them are connected outside the figure such as bolting and welding. By connecting by means, the other opening end of the guide blade tube 9 and the opening end 8 at the tip of the tube 6x are connected. In this way, the opening end 8 at the tip of the tube 6x is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9, and the guide blade tube 9 is at the end opening end face 18 of the tube 6x. When the tube 6x is propelled, the tip opening end face 18 of the tube 6x does not receive the resistance of the underground 10 and the propulsion resistance can be reduced. In addition, since the fitting hole 16 for fitting the opening end 8 at the tip of the tube 6x 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. The assembly of the tube 6x and the guide blade tube 9 can be facilitated. 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. This step is a watertight performance provided on the rectangular outer peripheral surface of the tube 2 and the inner peripheral surface of the starting port. It is formed small (for example, about 1 cm) so that the water stop performance can be maintained by the maintenance member.

The outer diameter of the guide blade tube 9 and the tube 6x is the same diameter, and the boundary portion of the guide blade tube 9 is welded all around with the other opening end surface of the guide blade tube 9 and the tip opening end surface 18 of the tube 6x abutting each other. Alternatively, the leading pipe 6 may be formed by spot welding.
Alternatively, a tube formed on a 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 pipe 6 can be reduced or no step occurs, so that the water stoppage by the watertight performance maintaining member provided on the rectangular outer peripheral surface of the pipe 2 and the inner peripheral surface of the starting port is provided. Good performance can be maintained.

  On the inner surface 20 of the pipe of the leading pipe 6, a pipe-side propulsive force receiving portion 21 is provided at a position on the leading side with respect to the central portion in the tube extending direction (the direction along the center line of the pipe). The tube side propulsive force receiving portion 21 receives the propulsive force from the propulsion device 4 via a substrate 25 provided in the excavating device 3 to be described later and propels the top tube 6. The tube-side propulsive force receiving portion 21 is formed to have a rectangular frame outer peripheral size corresponding to a rectangular shape that goes around the inner surface of the cross section of the front tube 6 (a cross section when the front tube is cut along a plane orthogonal to the center line of the front tube). The rectangular frame 22 is formed by the rectangular frame 22, and the rectangular frame 22 is installed in a state where the outer peripheral surface 23 of the rectangular frame 22 and the inner peripheral surface 20 a of the tube of the leading tube 6 correspond to each other. Is fixed to the inner peripheral surface 20a by a connecting means (not shown) such as welding, bolts and nuts.

The excavation apparatus 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 substrate 25 is disposed so that the center line of the top tube 6 and the center line of the substrate 25 coincide with each other, and is provided to be movable in the front-rear direction in the top 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 top tube 6. The size of the rectangular plate 30 is smaller than the rectangular dimension that goes around the inner surface of the cross section of the leading pipe 6 and is larger than the rectangular inner peripheral dimension of the rectangular frame 22 that forms the tube-side propulsive force receiving portion 21. Is also big. That is, the rectangular peripheral surface 33 on the front surface 39 f of the rectangular plate 30 that forms the substrate 25 and the frame rear surface 32 of the rectangular frame 22 that forms the tube-side thrust receiving portion 21 are formed to face each other. In addition, between the rectangular peripheral surface 33 in the front surface 39f of the rectangular plate 30 which forms the board | substrate 25, and the frame rear surface 32 of the rectangular frame 22 which forms the tube side thrust receiving part 21, the watertight formed by the elastic body, for example A performance maintaining member (packing) 35 is provided. The watertight performance maintaining member 35 is, for example, a rectangular attached to the rectangular peripheral surface 33 of the front surface 39f of the rectangular plate 30 forming the substrate 25 or the frame rear surface 32 of the rectangular frame 22 forming the tube side propulsive force receiving portion 21. The frame 36 is formed. 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, whereby the pipe 2 and the excavating machine 26 are propelled together.
One end of the support portion 40 of the excavating machine 26 is fixed to the central portion of the front surface 39 f of the substrate 25.
In addition, a through hole 38a is formed in the central portion of the substrate 25 so as to penetrate a pressure hose 56 described later.

The excavating machine 26 includes a support unit 40 and a rotating unit 41.
The support portion 40 is formed by a T-shaped hollow column in which one column 42 and two branch columns 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 fixing tool 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 in a direction away from each other on a straight line perpendicular to the extending direction of the columns 42 from the tip end portion (the other end portion) of the columns 42. That is, one end of the support column 42 is fixed to the substrate 25 so that the T-shaped hollow path of the support portion 40 communicates with the through hole 38a. A motor mount 44 is provided at each end of the branch column 43.

The rotating unit 41 includes a rotating mechanism unit 45 and a rotating excavator 46.
The rotation mechanism unit 45 is configured by a motor 47, for example. A casing 48 of a motor 47 is fixed to each motor mount 44;
The rotating shafts 49; 49 of the two motors 47; 47 extend in a direction away from each other on a straight line perpendicular to the extending direction of the support column from the tip end portion of the support column 42.
The rotary excavator 46 includes a housing 50 that is closed at one end and the other end, and a plurality of excavation bits (excavation blades) 52 provided on the outer peripheral surface 51 of the housing 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 a hydraulic motor 47) is used, a pressure hose 56 in which a hydraulic source 55 as the drive source 27 and the casing 48 of the hydraulic motor 47 form a pressure oil supply path 56a and an oil return path 56b. Connected with That is, the pressure hose 56 is connected to the casing 48 of the hydraulic motor 47 through the through hole 38 a and the T-shaped hollow path of the support portion 40. The hydraulic motor 47 is configured such that the rotating shaft 49 is rotated by pressure oil supplied into the casing 48 via the pressure hose 56.

For example, the other end closed inner surface 53 of the casing 50 and the hydraulic pressure are adjusted so that the center of the other end closed inner surface (inner bottom surface of the casing) 53 of the casing 50 of the rotary excavator 46 coincides with the rotation center of the rotary shaft 49. A connecting plate 54 provided at the tip of a rotating shaft 49 rotated by a motor 47 is connected by a connecting tool 57 such as a screw.
In other words, the two rotary excavating bodies 46 are configured to rotate around a single rotation center line L common to the two rotation shafts 49 and 49. That is, the two rotary excavating bodies 46 and 46 that rotate about the rotation center line L orthogonal to the propulsion direction of the leading pipe 6 are provided. Such a configuration including two rotary excavating bodies 46; 46 is called a twin header. When a so-called twin header provided with two rotary excavating bodies 46; 46 rotating around the rotation center line L orthogonal to the propulsion direction of the leading pipe 6 is used, the rotary excavating body 46 in a plane orthogonal to the propulsion direction is used. Therefore, it becomes possible to easily install the pipe 2 having a rectangular width corresponding to the excavation width in the underground 10.

In addition, what is necessary is just to adjust suitably the front-back position of the rotary excavation body 46; 46 by changing the installation position of the pipe side thrust receiving part 21 back and forth.
For example, as shown in FIG. 7, the rotary excavator 46; 46 so 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 excavator 46; 46 is installed so that the tip 80 of the excavation bit 52 protrudes forward from the cutting edge 81 of the guide blade tube 9, or the tip 80 of the excavation bit 52 is The rotary excavator 46; 46 is installed so as to be located in the leading pipe 6.

  If the excavating operation of the rotary excavating body 46; 46 is performed by causing the tip 80 of the excavating bit 52 to protrude forward from the cutting edge 81 of the guide blade tube 9, the ground located in front of the cutting edge of the guide blade tube 9 is excavated. Since the excavation can be surely performed by the bit 52, it is possible to reduce a 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 pushed. For example, the rotary excavator is configured such that the tip 80 of the excavation bit 52 projects forward from the cutting edge 81 of the guide blade tube 9 so that the rotation center line L and the cutting edge 81 of the guide blade tube 9 are located on the same plane. If the excavation operation by 46; 46 is performed, the ground located in front of the cutting edge of the guide blade tube 9 can be more reliably excavated by the excavation bit 52, and the tube 2 can be more easily propelled. Installation work can be performed more smoothly.

  Further, if the leading pipe 6 is propelled and the rotary excavating body 46; 46 is excavated with the tip 80 of the excavating bit 52 positioned in the leading pipe 6, the guide blade pipe 9 pierced into the ground 10 is used. Since only the underground part that enters the inside of the blade edge is excavated by the excavation bit 52, the excessive excavation part of the underground 10 is reduced, and the influence on the underground 10 such as ground subsidence can be reduced.

A fixed excavator 77 is provided between the rotary excavators 46;
The fixed excavation body 77 is attached in a fixed state to the front outer peripheral surface of the boundary portion between the two branch columns 43; 43 so as to protrude forward from the branch column 43 by fixing means such as welding or bolts and nuts.
The fixed excavation body 77 is formed in, for example, 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 the curved surface is along the circumferential direction of the curved surface. It is the structure formed so that it might become a continuous sharp blade shape.
Thus, since the fixed excavation body 77 has a configuration in which the central portion between the upper and lower sides is formed in a curved shape that bulges toward the cutting edge 81 side of the guide blade tube 9, the resistance of the ground when the leading tube 6 is propelled. Thus, the leading pipe 6 can be more smoothly propelled.

When the fixed excavation body 77 is not provided, the excavated earth and sand may be clogged between the rotary excavation bodies 46; 46, but the fixed excavation body 77 is interposed between the rotary excavation bodies 46; 46. When the fixed excavation body 77 collides with the ground by propelling the head pipe 6, the fixed excavation body 77 cuts the ground or distributes the earth and sand and rocks in the collided ground portion to the left and right. 46; 46, so that the leading pipe 6 can be promoted more smoothly.
For example, as shown in FIG. 7, 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 top tube 6. Configured to be located.
In this way, 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 configured to be located on the same plane perpendicular to the central axis of the top tube 6. In this case, as described above, the fixed excavation body 77 can be easily excavated by inducing cracks in the ground prior to excavation, and the fixed excavation body 77 collides with the ground and the top pipe It can also be prevented that 6 is not promoted.

In addition, you may comprise so that the center between the upper and lower sides of the fixed excavation body 77 may be located behind or ahead 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 configured to be positioned 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 prior to excavation. The effect that it becomes easy to excavate by inducing a crack is also acquired.
Conversely, if the center between the upper and lower sides of the fixed excavation body 77 is positioned 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 can be prevented that the fixed excavation body 77 collides with the ground before the cutting edge 81 of the bit 52 or the guide blade tube 9 and the leading tube 6 is not propelled.

  Further, the tip shape of the fixed excavation body 77 is such that the top pipe 6 collides with the ground by cutting the ground, and the left and right rotary excavation bodies 46 are distributed by dividing the earth and sand on the collided ground portion to the left and right; It may be formed in a shape that can achieve the role of directing to 46, or inducing cracks in the ground prior to excavation to facilitate excavation. For example, as described above, the tip of the front tip may be formed in a sharp blade shape, or the tip of the front tip may be formed in a plane shape, and the shape is such that the ground is easily excavated and broken depending on the geology of the ground. Should be selected.

Further, since the casing 50 of the rotary excavator 46 is installed away from the left and right inner surfaces of the guide blade tube 9 so as not to contact the left and right inner surfaces of the guide blade tube 9, It may be difficult to excavate the ground between the inner surface.
Therefore, the excavation bit 52 located on the center side of the top pipe 6 is provided so as to extend in a direction orthogonal to the central axis (center line L) of the housing 50, and as shown in FIGS. The excavation bit 52a (52) located on the left side of the leading pipe 6 is provided to extend to the left side of the leading pipe 6 as close as possible to the position on the left inner surface of the guide blade pipe 9, and is further located on the right side of the leading pipe 6. The excavation bit 52b (52) is extended to the right side of the leading pipe 6 as far as possible to a position as close to the right inner surface of the guide blade tube 9 as possible. The ground located at the left and right corners of the front pipe 6 can be excavated more effectively.

The water supply mechanism 75 includes a water storage tank 75a, a water supply hole 75b penetrating through the front surface 39f and the rear surface 39 of the substrate 25, a water supply pipe 75c formed of, for example, a bellows tube or a steel pipe, and a pump for water supply. 75d and a connecting pipe 75e.
For example, one end of the water supply pipe 75c is connected to the inside of 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 coupled by screwing. The other end opening of the water supply pipe 75c and the discharge port of the water supply pump 75d are connected so as to communicate with each other, and the suction port of the water supply pump 75d and the water storage tank 75a are connected so as to communicate with each other through the connection pipe 75e. Is done.

The mud drain mechanism 76 includes a mud hole 76a penetrating the front surface 39f and the rear surface 39 of the substrate 25, a mud pipe 76b formed of, for example, a bellows tube or a steel pipe, a pump 76c for draining mud, A tank 76d and a connecting pipe 76e are provided.
For example, one end of the mud pipe 76b is screwed inside the mud hole 76a so that the one end opening of the mud pipe 76b communicates with the space 69, so that the mud hole 76a and the mud pipe 76b are connected. One end is joined. The other end opening of the mud pipe 76b and the suction port of the mud pump 76c are connected so as to communicate with each other, and the discharge port of the mud pump 76c and the mud tank 76d can be communicated with each other through the connecting pipe 76e. Connected to

The water storage tank 75a and the waste mud tank 76d are constituted by a collective tank 75X in which the water storage tank 75a and the waste mud tank 76d are integrated. That is, the partition 75w is provided inside the collective tank 75X to divide the collective tank 75X into two regions, one region is used as the water storage tank 75a, and the other region is used as the waste mud tank 76d.
That is, when a certain amount of water is initially filled in the collecting tank 75X, and the water pump 75d is driven to pump water into the space 69, the water pumped into the space 69 and the excavating machine 26 excavate. Muddy water is mixed with the earth and sand. Then, the mud water in the space 69 is discharged into the mud tank 76d by driving the mud pump 76c. Mud in the mud discharged to the waste mud tank 76d settles at the bottom of the waste mud tank 76d, and the mud that has entered the water storage tank 75a beyond the partition 75w is again put into the space 69 by the pump 75d for water supply. 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 specific gravity greater than that of water can be supplied into the space 69, the pressure of the ground and groundwater can be resisted, and the pressure of the ground and groundwater and the pressure in the space 69 can be easily equalized. , The influence on the underground 10 can be reduced. Moreover, since the inside of the space 69 becomes muddy water, the mud can be drained smoothly and excavation is facilitated.

The coupling structure between the water supply hole 75b and one end of the water supply pipe 75c and the coupling structure between the mud hole 76a and one end of the mud pipe 76b may be the following coupling structure. That is, an unillustrated pipe portion communicating with the holes (water supply hole 75b, mud drain 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 feed pipe 75c, mud mud) are formed. The pipe portion and the pipe are joined by covering the butted portion with the annular joint member in a state where the one end opening end face of the pipe 76b is abutted with each other, or the pipe portion is fitted into the pipe via the one end opening of the pipe. The structure which couple | bonds a pipe part and a pipe | tube by clamp | tightening the outer peripheral surface of the one end opening part of a pipe | tube with an annular clip member in the state may be sufficient.
The muddy water may be filled in the collecting tank 75X from the beginning, and the muddy water may be circulated between the space 69 and the collecting tank 75X by driving the pump 75d for water supply.

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

A propulsive force transmission device 70 that receives a pressing force from the propulsion device 4 and transmits the pressing force to the tube 2 at the lateral position of the outer surface of the tube 2 installed on the bottom surface side of the guide pit A serving as a starting base of the tube 2. Includes, for example, a pair of propulsion force transmission members 85; 85, a propulsion force transmission rod-like body 710, the above-described substrate 25, the above-described watertight performance maintaining member 35, and the above-described tube-side propulsion force receiving portion 21. .
The left propulsive force transmitting member 85 as one propulsive force transmitting member is formed on the left outer side surface 6a of the pipe 2 having a quadrangular cross section installed on the guide table 90 provided on the bottom surface of the guide shaft A serving as a starting base. A transmission body 71 disposed on the outer side so as to face the left outer surface 6a in parallel, and one end side of the transmission body 71 provided to extend in a direction away from the left outer surface 6a of the pipe 2 A force receiving portion 72 that receives a pressing force from the hydraulic jack 62, and the other end side of the transmission body 71 so as to come into contact with the other end 71f of the rod-like body 71x of the left propulsive force transmission rod-like body 71A described later; And a pressing portion 73 that transmits the force transmitted through the force receiving portion 72 and the transmitting body 71 to the rod-shaped body 71x.
The right propulsive force transmitting member 85 as the other propulsive force transmitting member is formed on the right outer side surface 6b of the pipe 2 having a quadrangular cross section installed on the guide table 90 provided on the bottom surface of the guide pit A serving as a starting base. A transmission body 71 arranged on the outer side so as to face the right outer side surface 6b in parallel, and one end side of the transmission body 71 provided so as to extend in a direction away from the right outer side surface 6b of the pipe 2 A force receiving portion 72 that receives a pressing force from the hydraulic jack 62, and the other end side of the transmission body 71 provided so as to come into contact with the other end 71f of the rod-like body 71x of the right propulsive force transmission rod-like body 71B described later; And a pressing portion 73 that transmits the force transmitted through the force receiving portion 72 and the transmitting body 71 to the rod-shaped body 71x.
The left propulsive force transmission member 85 and the right propulsive force transmission member 85 have the same configuration, for example. Thus, by using the same configuration, the left propulsive force transmission member 85 can be used as the right propulsive force transmission member 85, or the right propulsive force transmission member 85 can be used as the left propulsive force transmission member 85. Can be used and is easy to use. Further, since only one type of propulsive force transmission member 85 needs to be manufactured, the mass productivity is excellent.
The propulsive force transmission rod-shaped body 710 has a length from one end 71e (see FIG. 10) to the other end 71f longer than the shortest distance between the rear surface 39 of the substrate 25 and the rear end 6e of the leading tube 6. 71x and a tilt prevention portion 71c that protrudes from the other end 71f side of the rod-shaped body 71x. The rod-shaped body 71x uses, for example, H-section steel, and the tilt prevention portion 71c uses, for example, a steel material that is joined to the H-section steel forming the rod-shaped body 71x by connection means such as welding or bolts. The tilt preventing portion 71c includes a face body 71d having a surface in contact with the left inner surface and the right inner surface of the leading pipe 6.
The propulsive force transmission 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 top tube 6, and the surface of the face member 71d and the left inner surface and the right inner surface of the head tube 6 The one end 71e and the rear surface 39 of the substrate 25 are joined by connection means such as welding or a bolt so that the two come into surface contact.
That is, the left propulsive force transmitting rod-shaped body 71A is installed so that the center line of the rod-shaped body 71x faces the same direction as the center line of the top tube 6, and the left propulsive force transmitting rod-shaped body 71A has a surface of the face 71d. One end 71e of the rod-shaped body 71x of the left propulsive force transmitting rod-shaped body 71A and the rear surface 39 of the substrate 25 are joined by a connecting means such as welding or a bolt so that the left inner surface of the front pipe 6 is in surface contact. The center line of the rod-shaped body 71x of the right propulsive force transmission rod-shaped body 71B is installed so as to face the same direction as the center line of the top tube 6, and the surface of the face body 71d of the right thrust-force transmission rod-shaped body 71B One end 71e of the rod-shaped body 71x of the right propulsive force transmitting rod-shaped body 71B and the rear surface 39 of the substrate 25 are joined by connection means such as welding or a bolt so that the right inner surface of the front pipe 6 is in surface contact.
One ends 71e; 71e of the left and right propulsive force transmission rod-like bodies 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-described configuration, the right and left propulsion force transmission members 85; 85, the left and right propulsion force transmission rods 71A; 71B, the substrate 25, Since the pipe 2 is propelled by being transmitted to the pipe 2 via the watertight performance maintaining member 35 and the pipe-side propulsive force receiving portion 21, it becomes possible to apply a pressing force evenly to the left and right of the pipe 2.

The guide stand 90 is provided in order to receive a reaction force transmitted from the pipe 2 to the hydraulic jack 62; 62 when the pipe 2 is pressed by the left and right hydraulic jacks 62; 62 in the guide shaft A serving as a starting base. It is installed between the force receiving wall 74 and the side wall AU of the guide pit A which becomes the starting surface.
The guide table 90 includes a guide surface 91 for guiding the pipe 2 to the side wall AU of the guide shaft A on which the pipe 2 is placed and serving as a starting surface, and left and right installations provided on the left and right sides of the guide surface 91. Pedestal 92; 92. The installation table 92 is configured by a table provided so as to rise from the side of the guide surface 91.
Movement of the pipe 2 placed between the inner side surfaces 92a; 92a on the guide surface 91 in the left-right direction is restricted by the inner side surfaces 92a; The
A left hydraulic jack 62 is fixed to the rear side of the top surface of the left installation base 92 by a fixture 67 and the right hydraulic jack 62 is fixed to the rear side of the top surface of the right installation base 92. It is fixed by 67 etc. The hydraulic jack 62 is installed on the top surface of the installation base 92 in an inclined state according to the angle of entry of the pipe 2 into the ground 10, so that the bottom surface of the cylinder 66 of the hydraulic jack 62 is attached to the reaction force receiving wall 74. It is in a state inclined with respect to the front surface. Therefore, a contact plate 79; 79 that contacts the bottom surface of the cylinder 66 is provided on the front surface of the reaction force receiving wall 74.
The force receiving portion 72 of the left propulsive force transmission member 85 is positioned in front of the left hydraulic jack 62 on the rear side of the upper surface of the left installation base 92 and the pressing portion 73 of the left propulsive force transmission member 85. However, the left propulsive force transmission member 85 is installed so as to come into contact with the other end 71f of the rod-like body 71x of the left propulsive force-transmitting rod-like body 71A.
Further, the force receiving portion 72 of the right propulsive force transmitting member 85 is positioned in front of the right hydraulic jack 62 on the rear side of the upper surface of the right installation base 92 and is pressed by the right propulsive force transmitting member 85. The right propulsive force transmission member 85 is installed so that the portion 73 contacts the other end 71f of the rod-like body 71x of the right propulsive force-transmitting rod-like body 71B.

In addition, since the guide stand 90 mounts a curved pipe or a bent pipe as the pipe 2, as shown in FIG. 12, the guide surface 91 and the upper surfaces of the left and right installation bases 92; 92 are curved in accordance with the curvature of the curved pipe. A structure in which the concave groove 93 is curved and extended along the extending direction of the installation base 92 is used. Further, a pipe entry angle setting means 95 (see FIG. 11; see FIG. 12) for determining the installation inclination angle of the guide surface 91 in accordance with the entry angle of the pipe 2 into the ground 10 is provided. For example, the pipe entry angle setting means 95 is configured by a support base, a support frame, or the like that is detachably provided on the lower surface of the guide table 90 or that is integrally formed on the lower surface of the guide table 90. It is constituted by a support stand, a support frame, etc., which are integrally formed on the lower surface of the guide stand 90.
Furthermore, the outer side surfaces 92b; 92b of the left and right installation bases 92; 92 (the side surfaces facing in parallel to the inner side surface 92a and the left and right side surfaces of the guide base 90) have a concave cross-sectional shape that opens to the outer side surface 92b. A concave groove 93 extending in the extending direction (front-rear direction) of the installation base 92 is provided. The front end surface of the installation base 92 corresponding to the front end of each concave groove 93; 93 of the guide base 90 is formed in an opening 93 a, and the travel means 114 of the pressing member 110 described later passes through the opening 93 a in the concave groove 93. Inserted into.
In addition, each support | pillar 111; 111 provided with the travel means 114 of the pressing member 110 mentioned later and the beam material 112 are comprised so that decomposition | disassembly is possible, and the travel means 114 of each support | pillar 111 is inserted in the recessed groove 93. It is also possible to assemble the pressing member 110 by connecting the upper ends of the columns 111; 111 with the beam material 112 in a state where the columns 111; 111 are erected. The front end surface of the installation base 92 corresponding to the front end of 93 and the concave grooves 93 of the guide base 90; the rear end surface of the installation base 92 corresponding to the rear end of 93 may be closed.

As shown in FIG. 11; FIG. 12, the propulsive force transmission member 85 is configured by combining, for example, a transmission body 71, a force receiving portion 72, and a pressing portion 73 that are separately formed of steel.
The transmission body 71 is configured by combining, for example, section steel. And the force receiving part 72 is extended in the direction orthogonal to the said one outer surface from the one end side of the extension direction of the transmission body 71 in one outer side surface 71a of a pair of outer surfaces which the transmission body 71 mutually opposes. The pressing portion 73 is orthogonal to the other outer surface 71b from the other end side in the extending direction of the transmitting body 71 on the other outer surface 71b of the pair of outer surfaces facing each other of the transmitting body 71. It is provided to extend in the direction. That is, the force receiving portion 72 and the pressing portion 73 are provided so as to extend in directions away from the outer side surfaces 71a; 71b of the transmission body 71.
The force receiving portion 72 includes a connecting plate 72a that is connected to one end of one outer surface 71a of the transmission body 71 by connecting means such as a bolt, a nut, or welding, and a force receiving plate 72b that receives the 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 by a flat plate that comes into surface contact with one outer surface 71a parallel to the extending direction of the transmission body 71 and is connected to one end side of the one outer surface 71a. The force receiving plate 72 b is formed by a flat plate that forms a surface orthogonal to one outer surface 71 a parallel to the extending direction of the transmission body 71.
The pressing portion 73 includes a connecting plate 73a connected to the other end side of the other outer surface 71b of the transmitting body 71 by connecting means such as a bolt, a nut, or welding, and the other end of the rod-shaped body 71x of the propulsive force transmitting rod-shaped body 710. A pressing plate 73b that comes into contact with 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 by a flat plate that comes into 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 side of the other outer surface 71b. The pressing plate 73 b is formed by a flat plate that forms a surface orthogonal to the other outer surface 71 b parallel to the extending direction of the transmission body 71.

In addition, since the excavating machine 26 is installed inside the first pipe 6 that is first installed in the ground 10, the first pipe 6 should have a length longer than that of the subsequent pipe 7. However, conventionally, when propelling such a long pipe 6, the hydraulic pipe 62 cannot be installed behind the pipe 6 because the pipe 6 is long. In some cases, the front pipe 6 cannot be propelled, or only a small hydraulic jack with a short piston rod extension stroke can be installed behind the front pipe 6. When only a short and small hydraulic jack can be installed, the top pipe 6 can be pushed a little by one maximum extension operation of the piston rod of the hydraulic jack, so the piston lock of the hydraulic jack A hydraulic jack is repeated many times by interposing a spacer (not shown) between the tip of the rod and the other end 71f of the rod-like body 71x, or every time the extension operation of the hydraulic jack ends. In addition, it is necessary to move the hydraulic jack reaction force receiving wall 74 forward and repeat the extension operation of the hydraulic jack many times, and the working efficiency of the hydraulic jack when propelling the top pipe 6 to the ground 10 is poor.
According to the third embodiment, since the hydraulic jacks 62; 62 can be installed beside the left and right outer surfaces 6a; 6b of the leading pipe 6 installed at the starting part, the rear part of the leading pipe 6 installed at the starting part is provided. Even when the hydraulic jack 62 cannot be installed, the leading pipe 6 can be propelled, and a piston rod 63 having a long extension stroke can be used as the hydraulic jack 62. The leading pipe 6 can be moved a long distance by the maximum extending operation, and the working efficiency by the hydraulic jack 62 can be improved.

As shown in FIG. 11; FIG. 12, the pressing member 110 includes a pair of support columns 111; 111 and a pair of support columns provided to face each other in parallel with an interval wider than the left-right width interval of the guide table 90. 111; A structure including a portal body 113 provided with a beam member 112 that connects upper end portions of 111, traveling means 114 provided on the lower end portions of the pair of support columns 111; 111, and a connecting member 120, respectively. It is.
The gate-shaped body 113 is configured by combining a support column 111 and a beam member 112 using, for example, a section steel such as an H-section steel.
The traveling means 114 includes a base 115 fixed to inner surfaces facing each other at the lower ends of the respective columns 111; 111, and a wheel 116 rotatably provided on the base 115 via a rotation center axis. .
The base table 115 is formed of a long member having a concave cross section, for example, provided with rising plates extending vertically in the same direction with respect to the long plate 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 perpendicular to the extending direction of the column 111 and extends in parallel with the side surface of the tube 2.
For example, a base plate of a caster provided with a wheel 116 is fixed to a long plate that forms the bottom of the recess of the base stand 115, and the wheel 116 protrudes upward from the rising plate through the opening of the recess from the bottom of the recess. To be provided. For example, two wheels 116 are provided at intervals along the extending direction of the base table 115.

  The traveling means 114 provided at the lower end of each column 111; 111 is inserted into the left and right installation bases 92; By inserting the connecting member 120 between the upper surface 6u of the pipe 2 placed on the top 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 travels, the portal body 113 including the traveling means 114 and the connecting member 120 are configured to travel together.

  That is, the rear end 6e of the pipe 2 remaining in the guide shaft A after the pipe 2 enters the underground 10 from the front end moves in a direction intersecting the central axis of the pipe 2 (for example, the rear end 6e of the pipe 2 is A pipe rear end movement restricting means 200 that restricts the movement of the pipe rear end movement restricting means 200, and the pipe rear end movement restricting means 200 engages with the wheel 116 of the pressing member 110 and has a concave groove 93 that forms a running surface of the wheel 116. The guide table 90 provided, the wheel 116 is engaged with the concave groove 93, and the wheel 116 is provided so as not to deviate from the concave groove 93 in a direction perpendicular to the extending direction of the concave groove 93. 91, a portal body 113 positioned above the pipe 2 so as to face the upper surface 6u (outer surface of the pipe 2) of the pipe 2 placed on the pipe 91, a beam 112 of the portal body 113, and an upper surface 6u of the pipe 2 Between the wheel 116 and the beam member 112 The peripheral surface is configured to include a connecting member 120 into contact with the upper wall surface 93t of the concave groove 93.

  In other words, the connecting member 120 is inserted between the tube 2 and the beam member 112 so as to bite like a wedge, and comes into close contact with the tube 2 and the beam member 112, so that the tube 2 is advanced when the tube 2 advances. Is transmitted to the pressing member 110 so that the wheel 116 of the pressing member 110 can travel on the traveling surface formed by the upper wall surface 93t of the concave groove 93 and the outer peripheral surface of the wheel 116. It is a member which contacts the upper wall surface 93t. The connecting member 120 is, for example, a contact plate 121 brought into contact with the upper surface 6 u of the pipe 2, and is bitten like a wedge between the contact plate 121 and the beam material 112 to push up the beam material 112 to raise the contact plate 121 and the beam material. 112 and a square member 122 that contacts the upper wall surface 93 t of the concave groove 93.

That is, a gate provided with a pair of struts 111; 111 facing each other and a beam member 112 connecting the upper ends of the struts 111; 111 and traveling means 114; 114 provided at the lower ends of the struts 111; 111. Form 113, guide stand 90 provided with a concave groove 93 into which each traveling means 114 provided at the lower end of each support column 111 of the pressing member 110 is inserted, and a pipe installed on the guide surface 91 of the guide stand 90 2 and the beam member 112 of the gate-shaped body 113 are inserted so as to bite like a wedge so that the tube 2 and the beam member 112 are brought into close contact with each other and the wheel 116 of the gate-shaped body 113 can travel on the traveling surface. When the pipe 2 enters the underground 10 from the tip, the pipe rear end movement restricting means 200 is provided. Remaining pipe Tube 2 is driven into the ground 10 at the back end 6e of is held down so as not to move in a direction away from the guide surface 91 by a tube rear movement restricting means 200. That is, when the pipe 2 is installed in the ground 10 from the tip, the rear end movement restricting means 200 prevents the rear end of the pipe 2 remaining at the starting portion from rising.
That is, in the third embodiment, a guide table 90 having a guide surface 91 for contacting the lower surface (outer surface) which is one outer surface of the tube 2 and guiding the tube 2 to the side wall AU of the guide shaft A, It is restricted that the rear end 6e of the pipe 2 remaining in the guide shaft A after entering the underground 10 from the tip through the side wall AU of the guide shaft A moves in a direction intersecting the center line of the tube 2. A pipe rear end movement restricting means 200, and the pipe rear end movement restricting means 200 moves together with the pipe 2 while pressing the pipe 2 so as to press the pipe 2 installed on the guide surface 91 against the guide surface 91. The holding member 110 is provided so as to be movable with respect to the guide table 90.

Next, with reference to FIG. 10, the installation method of the pipe | tube 2 to the underground 10 by the pipe installation apparatus 1 is demonstrated.
Here, it is assumed that the pipe length of the leading pipe 6 is longer than that of the succeeding pipe 7, and the succeeding pipe 7 having a pipe length approximately half the length of the leading pipe 6 is used as the trailing pipe 7. An example will be described.
The substrate 25 to which the excavating machine 26, the propulsion force transmission rod 71, the water supply pipe 75 c and the mud pipe 76 b are attached is installed inside the top pipe 6. That is, the rectangular peripheral surface 33 on the front surface 39 f of the rectangular plate 30 that forms the substrate 25 is arranged on the frame rear surface 32 of the rectangular frame 22 that forms the tube-side propulsive force receiving portion 21 inside the top tube 6. It is installed so that it is in a state of being pushed through. As a result, when the pipe 2 is installed in the underground 10 from the side wall AU of the guide shaft A serving as the starting base, the excavating machine 26 is installed inside the tip opening 6t side of the leading pipe 6 that is first inserted into the underground 10. Is done.
As shown in FIG. 10 (a), in the guide shaft A serving as a starting base, a guide stand 90 is installed on the front side of the side wall AU, and the excavating machine 26, the water supply pipe 75c, and the mud pipe 76b are attached. The leading pipe 6 is placed on the guide surface 91 with the tip opening 6t of the leading pipe 6 with the substrate 25 placed inside facing the side wall AU of the guide shaft A.
In addition, the guide stand 90 is fixed to the ground of the departure portion 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, or increases its own weight. For this purpose, a weight is added to the guide base 90 or a heavy weight guide base 90 with an increased weight is used.
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 pipe 6 placed on the guide surface 91 below the beam member 112. The connecting member 120 is inserted between 6 u and the beam member 112, and the upper wall surface 93 t as a running surface of the concave groove 93 and the outer peripheral surface of the wheel 116 are brought into contact with each other.
In addition, the left hydraulic jack 62 is fixed to the rear side of the upper surface of the left installation table 92, and the right hydraulic jack 62 is fixed to the rear side of the upper surface of the right installation table 92. Further, the left propulsive force transmission member 85 is installed so that the transmission body 71 faces the rear side of the left outer side surface 6 a of the leading pipe 6 in parallel, and the transmission body 71 is located behind the right outer side surface 6 b of the leading pipe 6. The right propulsive force transmission member 85 is installed so as to face in parallel.

  10B, the excavating machine 26 and the left and right hydraulic jacks 62; 62 are operated, so that the pressing plate 64 at the tip of the piston rod 63 becomes the force receiving plate 72b of the propulsive force transmitting member 85. At the same time, the pressing plate 73b of the propulsive force transmitting member 85 comes into contact with the other end 71f of the rod-like body 71x, and the leading pipe 6 advances to the ground 10 as the piston rod 63 extends. That is, the pump 75d for water supply shown in FIG. 7 is driven to supply muddy water into the space 69, and the muddy water is circulated between the space 69 and the collecting tank 75X. The propulsive force transmitted to the top pipe 6 via the propulsive force transmission device 70 is achieved by extending the piston rod 63 of the hydraulic jack 62 while supplying the hydraulic oil from the hydraulic motor 47 to the hydraulic motor 47 and rotating the rotary excavator 46. As the rotary excavator 46 rotates, the leading pipe 6 is propelled forward through a starting hole (not shown) formed in the side wall AU of the guide pit A, and the leading pipe 6 is installed in the ground 10. The earth and sand excavated by the rotary excavator 46; 46 in the ground 10 are mixed with water in the space 69 to become muddy water and discharged to the mud tank 76d. When the leading pipe 6 advances, the connecting member 120 and the holding member 110 move together, and the connecting member 120 and the holding member 110 prevent the rear end 6e of the leading pipe 6 remaining at the starting portion from being lifted. The

Next, after the piston rods 63; 63 of the left and right hydraulic jacks 62; 62 are extended to the maximum extent, as shown in FIG. 10 (c), the piston rods 63; After removing 85, 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 succeeding pipe 7 is connected to the rear end 6e of the leading pipe 6 by welding or a fixing tool such as a bolt, and as shown in FIG. 10 (d), the other end 71f of the leading propulsive force transmitting rod-like body 710 and By joining one end 71e of the subsequent propulsive force transmitting rod-like body 71 with a bolt or welding, the subsequent propulsive force transmitting rod-like body 710 is added behind the leading propulsive force transmitting rod-like 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 drain mud pipe (not shown) is connected to the other end of the mud pipe 76b. We will add.
Then, as shown in FIG. 10 (d), the left propulsive force transmission member 85 is installed so that the transmission body 71 faces the left side surface of the subsequent pipe 7 in parallel, and the transmission body 71 is positioned on the right side surface of the subsequent pipe 7. After the right propulsive force transmission member 85 is installed so as to face in parallel, the excavating machine 26 and the left and right hydraulic jacks 62; 62 are operated, so that the pressing plate 64; 64 at the tip of the piston rod 63; While being in contact with the force receiving plate 72b of the propulsive force transmitting member 85, the pressing plate 73b of the propulsive force transmitting member 85 is in contact with the other end 71f of the rod-like body 71x, and the leading pipe 6 further increases as the piston rod 63 extends. The rear pipe 7 moves forward while propelling to the underground 10.
Thereafter, similarly, the pipe C can be constructed by sequentially connecting the subsequent succeeding pipe 7 to the previous succeeding pipe 7 and installing it in the underground 10. If the rear end 6e of the succeeding pipe 7 is lifted when propelling the succeeding 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; The connecting member 120 is inserted between the upper surface of the succeeding pipe 7 placed on the guide surface 91 below the beam member 112 and the beam member 112, and the upper surface as the running surface of the concave groove 93. 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 in the guide shaft A is prevented from being lifted.
That is, when the leading pipe 6 is installed in the ground 10 and the trailing end 6e of the leading pipe 6 is lifted, the pipe trailing end movement restricting means 200 may be used. If the lifting phenomenon does not occur, it is not necessary to use the pipe rear end movement restricting means 200. Further, when the trailing pipe 7 is propelled to the ground 10 and the trailing end 6e of the trailing pipe 7 is lifted, the pipe trailing end movement restricting means 200 may be used. If the lifting phenomenon does not occur, it is not necessary to use the pipe rear end movement restricting means 200.

  After the pipe C is installed in the ground 10, the excavating machine 26 is pulled back into the guide shaft A, which is the starting base that is the starting point of excavation, and collected.

  If the above-described pipe installation device 1 is used, an excavation machine having a rotary excavator 46 that rotates around the rotation center line L intersecting the propulsion direction of the front pipe 6 on the inner side of the front pipe 6 on the tip opening 6t side. 26 is pushed and the pipe 2 is pressed and the underground is excavated by the excavating machine 26 so that the pipe 2 is propelled and installed in the underground 10. Since the underground portion near the inner corner of the tube 2 having a rectangular cross section can be excavated by the two rotary excavators 46; 46, the tube 2 can be smoothly driven in the underground 10. Thus, the pipe C can be easily installed in the underground 10.

  According to the pipe installation device 1 of the third embodiment, since the propulsive force transmission device 70 is provided, the inside of the guide shaft A where the pipe installation device 1 is installed is narrow, and the rear side of the pipe 2 in the guide shaft A. Even when there is no installation space for installing the hydraulic jack 62, the hydraulic jack 62; 62 can be installed along the left and right outer surfaces 6a; 6b of the pipe 2, and the hydraulic jack 62 can be installed. Even if 62; 62 cannot be installed on the rear side of the pipe 2, the pipe 2 can be propelled and advanced into the ground 10.

  Moreover, since it becomes possible to install the hydraulic jacks 62; 62 along the 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 over a long distance by one maximum extension operation of the piston rod 63, and the working efficiency of the hydraulic jack 62 can be improved.

Further, in the case where a tube having the same length as the tube of the leading tube 6 is used as the succeeding tube 7, in the state of FIG. 10C, instead of the left and right propulsive force transmitting members 85; Further, a horizontal member (not shown) is provided across the pressing plates 64; 64 of the left and right hydraulic jacks 62; 62 so as to contact the other ends 71f; 71f of the left and right propulsive force transmission rods 71A; 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 through the horizontal member, and the leading pipe 6 moves forward. Therefore, an installation space for the subsequent pipe 7 is formed between the rear end 6 e of the leading pipe 6 and the reaction force receiving wall 74.
When the subsequent pipe 7 is sequentially connected to the rear end of the leading pipe 6, when an installation space for installing the hydraulic jack 62 on the rear side of the subsequent pipe 7 is secured in the guide shaft A, At the starting portion, a hydraulic jack 62 is installed on the rear side of the succeeding pipe 7, and the left and right propulsive force transmitting rod-like bodies 71A; 71B, the other end 71f; The trailing pipe 7 and the leading pipe 6 may be propelled by pressing a horizontal member (not shown) provided across 71f with the hydraulic jack 62;

According to the third embodiment, after the pipe that restricts the rear end 6e of the pipe 2 remaining in the guide shaft A after the pipe 2 enters the ground from the tip from moving in the direction intersecting the center line of the pipe 2. Since the end movement restricting means 200 is provided, when the pipe 2 is installed in the ground 10 from the tip, the rear end 6e of the pipe 2 remaining in the guide shaft A is lifted in the guide shaft A, for example. Since the phenomenon that the rear end 6e of the remaining pipe 2 moves in the direction intersecting the center line of the pipe 2 (hereinafter referred to as the pipe rear end movement phenomenon) can be suppressed, the traveling direction deviation of the pipe 2 that has entered the underground 10 can be prevented. The pipe 2 can be accurately installed at the planned underground position.
The cause of the phenomenon of the pipe rear end movement described above is that the excavating machine 26 provided inside the leading pipe 6 is heavy, or the leading end side of the pipe installed in the ground 10 of the leading pipe 6. When the length of the pipe remaining in the starting portion is longer than the length of the pipe, it is conceivable that the weight balance of the leading pipe 6 is lost. In addition, the pipe rear end movement phenomenon can occur when either a bent pipe or a bent pipe is used as the pipe 2, but in particular, when the bent pipe is installed in the ground 10, The connecting portion between the pipes constituting the tube becomes a corner portion, and only the corner portion of the connecting portion of the bent tube placed on the guide surface 91 formed on the curved surface comes into contact with the curved surface of the guide surface 91. Since the corner portion of the connecting portion of the bent pipe becomes a rotation fulcrum and is easy to rotate, the above-described tube rear end movement phenomenon tends to become remarkable. According to Embodiment 3, the pipe rear end movement phenomenon can be reliably suppressed.
The pipe rear end movement restricting means 200 can move with the pipe 2 while pressing the pipe 2 so as to press the pipe 2 installed on the guide surface 91 against the guide surface 91 and can move with respect to the guide table 90. Since the pressing member 110 is provided as described above, the pipe 2 can be pushed to the ground 10 while pressing the pipe 2 against the guide surface 91 and suppressing the above-described pipe rear end movement phenomenon.
Further, the pressing member 110 includes a pair of support pillars 111; 111 disposed on both sides of the pipe 2 at an interval wider than the horizontal width of the pipe 2 installed on the guide surface 91, and a pair of support pillars 111; 111. The upper end portions (one end portions) of the pipes 2 are connected to each other and formed on a gate body 113 including an upper surface 6u (outer surface) of the pipe 2 disposed on the guide surface 91 and a beam member 112 facing the upper surface 6u. Since the connecting member 120 for bringing the beam member 112 and the upper surface 6u of the tube 2 into close contact with each other is provided, the tube member 2 is pressed against the guide surface 91 by the beam member 112 and the connecting member 120 of the portal body 113, and the tube after The pipe 2 can be propelled to the ground 10 while suppressing the end movement phenomenon.
The left and right installation bases 92; 92 of the guide base 90 are provided with a concave groove 93 that forms a traveling surface, and the pressing member 110 includes a traveling means 114 that travels on the traveling surface and is engaged in the concave groove 93. The holding member 110 can be moved smoothly, and the propulsion work can be performed efficiently.

Embodiment 4
The pipe rear end movement restricting means may be configured such that the lower end portion of the column 111 of the pressing member 110 is detachably attached to the propulsive force transmission member 85. In this case, since the holding member 110 moves together with the pipe 2 by pushing the pipe 2 while holding the upper surface of the rear end portion of the pipe 2 with the holding member 110, the movement of the rear end of the pipe is performed as in the first embodiment. The phenomenon can be prevented. That is, the pipe rear end movement restricting means 200 according to the second embodiment can move with the pipe 2 while pressing the pipe 2 so as to press the pipe 2 installed on the guide base 90 against the guide surface 91, and the guide base 90 can be moved. The holding member 110 is detachably attached to the propulsive force transmission member 85 so as to be movable. In the case of Embodiment 2, it can be set as the structure which does not provide the travel means 114 and a travel surface.

Embodiment 5
As the pipe rear end movement restricting means, a structure that is formed in a tunnel cylindrical shape surrounding the outer peripheral surface of the pipe 2 placed on the guide surface 91 and is fixed in front of the starting port may be used.

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

Embodiment 7
On the inner side surfaces 92a; 92a of the left and right installation bases 92; 92 facing each other, a concave groove (not shown) as a concave portion extending in the extending direction of the installation base 92 with a concave cross section opening to the inner side surface 92a. And the left and right outer surfaces 6a; 6b of the tube 2 are provided with protrusions (not shown) that are inserted into and engaged with the left and right grooves, and the protrusions are engaged with the grooves and protruded. It is good also as a structure provided so that may not remove | deviate from the ditch | groove in the direction orthogonal to the extension direction of the said ditch | groove. That is, the convex portions provided on the left and right outer surfaces 6a; 6b of the pipe 2 placed on the guide surface 91, and the left and right installation bases 92; 92 facing the left and right outer surfaces 6a; Concavity and convexity engagement with a concave groove as a concave portion provided on the inner side surface 92a; 92a, or a concave portion provided on the left and right outer side surfaces 6a; 6b of the tube 2 placed on the guide surface 91, The pipe 2 has entered the ground 10 from the tip due to the concave-convex engagement with the convex portions 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; Pipe rear end movement restricting means for restricting movement of the rear end of the pipe 2 remaining in the rear guide shaft A in a direction intersecting the central axis of the pipe 2 is configured. In addition, an opening outside the figure is formed on the front end surface of the installation base 92 corresponding to the front end of each of the above-mentioned concave grooves not shown in the drawing of the guide base 90, and the pipe 2 is propelled so that the convex portion extends beyond the opening. Before entering the middle 10, the convex portion is removed.
In the case of the seventh embodiment, the concave grooves are provided so that convex portions attached to the left and right outer surfaces 6a; 6b of the pipe 2 by welding, bolts, nuts, or the like can be inserted into the concave grooves not shown from above the guide surface 91. An insertion hole (not shown) is formed by cutting out the upper wall.
In the case where no insertion hole is provided, after the tube 2 is placed on the guide surface 91, the protrusions forming the convex portions that are inserted into the groove are welded to the left and right outer surfaces 6a; 6b of the tube 2. You may attach with a bolt and a nut.

  According to the seventh embodiment, the pipe rear end movement restricting means is in contact with the outer surface of the pipe 2 and on both sides of the guide surface 91 when the pipe 2 is put into the ground and the pipe 2 installed on the guide surface 91. Left and right installation bases 92; 92 as inner walls 92a; 92a; 92a; guide base 90 provided with 92a; left and right outer surfaces 6a; 6b of pipe 2 as outer surface of pipe 2 installed on guide surface 91 And a concave / convex engaging body comprising concave and convex portions that are provided on the inner side surfaces 92a; 92a (walls) of the left and right installation bases 92; 92 facing the right and left outer surfaces 6a; 6b. Therefore, the pipe rear end movement phenomenon can be prevented by the concave-convex engagement body.

One or more pipe rear end movement restricting means described in the third to seventh embodiments may be used in combination.
Moreover, although the example which mounts the pipe | tube 2 on the guide surface 91 which is a concave curved surface and installs the said pipe | tube 2 in the ground was shown above, the guide surface which is the curved curved surface of the guide stand 90 is shown. You may make it mount the pipe | tube 2 on the top and install the said pipe | tube 2 in the ground.
Moreover, you may use the pressing member of the structure which is not provided with the connection material 120 as a pressing member of Embodiment 1; 2. For example, the beam material 112 of the portal body 113 and the upper surface 6u of the pipe 2 may be used in contact with each other, or the beam material 112 of the portal body 113 and the upper surface 6u of the pipe 2 may be detachably connected. .
Moreover, it is good also as a structure which the lower wall surface as a running surface of the ditch | groove 93, and the outer peripheral surface of the wheel 116 are made to contact. In addition, the running means 114 of the gate-shaped body 113 is engaged with the above-described concave grooves formed on the inner side surfaces 92a; 92a facing each other of the respective platforms forming the left and right installation bases 92; You may comprise so that the wheel 116 of the driving | running | working means 114 can drive | work the driving | running | working surface formed in the inside.
It is good also as a structure which does not provide the travel means 114 and a travel surface.
In Embodiments 1; 2; 4, a guide base having a guide surface without the left and right installation bases 92; 92 may be used.

Embodiment 8
As shown in FIG. 13, the rotation center line L of the rotary excavator 46 is parallel to a pair of outer surfaces facing the parallel direction of the leading pipe 6 and is not perpendicular to a plane perpendicular to the propulsion direction of the leading pipe 6. By providing the excavating machine rocking drive device 250 that is set to intersect with each other, the cross-sectional area wider than the cross-sectional area of the leading pipe 6 is provided in front of the leading pipe 6 before the leading pipe 6 advances. You may use the pipe installation apparatus 1X which can excavate and can excavate in front of the front pipe 6. FIG. For example, as shown in FIGS. 13 (a) and 13 (b), the rotary excavator 46 has a configuration that can swing left and right in the excavation progress direction.
Hereinafter, an example of the tube installation device 1X will be described, but the same components as those described in the tube installation device 1 of Embodiment 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
A pipe installation device 1X according to the seventh embodiment includes a excavating machine swing driving device 250 instead of the substrate 25 and the pipe-side propulsion receiving portion 21 that are the configuration of the excavation device 3 of the pipe installation device 1 described in the second embodiment. It is a configuration.
The excavating machine swing drive device 250 includes a swing substrate 300, a guide member 310 of the swing substrate 300, and a swing substrate driving means 320.
In the tube installation device 1X, the guide member 310 is installed on the inner side of the front end opening 6t side of the front tube 6 so that the center line of the tube of the cylindrical guide member 310 matches the center line of the tube of the front tube 6. The watertightness between the outer peripheral surface 330 of the cylinder of the guide member 310 and the inner peripheral surface 6s of the leading pipe 6 is maintained by a watertight performance maintaining member 340 such as rubber packing, and the swinging substrate 300 is mutually connected to the leading pipe 6. The left and right side walls 301; 302 with the center between a pair of parallel outer surfaces facing each other as the center of rotation are attached to the guide member 310 so that the side wall can swing back and forth, and the outer peripheral surface 390 of the swing substrate 300 and the guide member 310 The water tightness between the inner peripheral surface 350 of the cylinder is maintained by a water tightness performance maintaining member 125 such as rubber packing. A propulsive force receiving portion 630 is provided in front of the guide member 310 on the inner side of the leading tube 6 on the tip opening 6t side, and the propelling force receiving portion 630 is installed inside the leading tube 6 on the tip opening 6t side. It is possible to restrict the forward movement of the guide member 310 by contacting the front end surface 311 of the cylinder of the member 310 and to transmit the propulsive force transmitted to the guide member 310 via the propulsive force transmission device 70 to the leading pipe 6. In order to be able to do so, it is fixed to the inner peripheral surface 6s on the tip opening 6t side of the leading pipe 6 by fixing means such as welding, bolts and nuts. Further, the swing substrate 300 is formed with a support holding through hole 130, a mud pipe holding through hole 140, and a water supply tube holding through hole 150 that pass through the flat plate of the swing substrate 300 forward and backward. In the excavating machine 26, the support 42 of the excavating machine 26 is held in a fixed state in a state of being penetrated, and the drainage pipe holding through hole 140 is held in a fixed state in which the tip of the drainage pipe 76b is penetrated. 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. Further, the rotary excavating body 46 of the excavating machine 26 having a plurality of excavating bits (excavating blades) 52 is positioned in front of the tip opening 6t of the top pipe 6 and the column 42 that supports the rotary excavating body 46 is a swinging substrate. 300 is supported.
According to the pipe installation device 1X of the eighth embodiment, when excavating the underground 10 in front of the top pipe 6 with the rotary excavator 46, the swing board driving means 320 such as a hydraulic jack is a pair of the swing board 300. By pressing and pulling back the rear surface of the side wall 301; 302 side of the wall, the rotational center line L of the rotary excavator 46 is opposed to the surface perpendicular to the propulsion direction of the leading pipe 6 and the leading pipe 6 in parallel with each other. A first state parallel to a pair of outer surfaces (for example, upper and lower outer surfaces of the leading tube 6), and a pair of outer surfaces of the leading tube 6 facing each other in parallel (for example, upper and lower outer surfaces of the leading tube 6). And a second state (see FIGS. 13A and 13B) that intersects the surface perpendicular to the propulsion direction of the leading pipe 6 in a state other than perpendicular.
That is, the pipe installation device 1X includes the excavating machine rocking drive device 250 for rocking the rotary excavating body 46 in the left-right direction of the top pipe 6 in front of the top pipe 6, so When the rotary excavator 46 is excavated by the rotary excavator 46, the rotary excavator 46 can be swung in the left-right direction by driving the swing substrate 300 by the swing substrate driving means 320, for example. Compared with the case where it does not swing, the left-right width that can be excavated can be increased. In other words, if the pipe installation device 1X is used, the underground 10 can be excavated at a width interval that is wider than, for example, the left-right width interval of the front tube 6 in front of the front tube 6 before the front tube 6 advances. Since it is possible to excavate the front pipe 6 in the left-right width direction in front of 6, the hard ground layer in front of the top pipe 6 can be excavated, and even when the underground 10 is a hard ground layer, the pipe 2 can be underground. 10 can be smoothly promoted.

  In the case where the pipe is installed in the ground 10 using the pipe installation device 1X including the excavating machine swing drive device 250 of the eighth embodiment, the width is wider than the cross-sectional area of the front pipe 6 in front of the front pipe 6. Cross section can be excavated. That is, since the underground pipe 10 in front of the leading pipe 6 can be dug in the underground pipe 10 on the left and right sides of the leading pipe 6, the pipe 2 can be smoothly driven in the underground 10.

Embodiment 9
As shown in FIGS. 14 and 15, the rotary excavation body includes a first excavation bit 8 e and a second excavation bit 8 f as excavation blades provided so as to protrude from the outer peripheral surface 51 of the housing 50. A rotary excavator 46A having the above-described configuration may be used.
A plurality of second excavation bits 8 f are arranged in a direction along the rotation center line L of the housing 50 to constitute a second excavation bit group 810.
A plurality of bit attachment portions 83 are provided on the outer peripheral surface 51 of the housing 50 so as to be scattered. The first excavation bits 8e are detachably attached individually to individual bit attachment portions 83 provided on the outer peripheral surface 51 of the housing 50. The second excavation bit 8 f 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. In other words, 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). A plurality of second excavation bits 8f on the bit installation surface 84a of the bit installation plate 84 extending across the width of the casing 50, that is, both end surfaces in the direction along the rotation center line L of the casing 50). It is a configuration that is detachably or fixedly provided so as to be aligned in a direction along L.
In each rotating excavation body 46A, the first excavation bits 8e are provided at positions 180 degrees apart from each other 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 at a portion where the first excavation bit 8e is not provided.
As shown in FIG. 14 (b), the tips of the respective excavation bits 8f of the second excavation bit groups 810; 810 provided at positions 180 ° apart from each other in the circumferential direction on the outer peripheral surface 51 of the casing 50 are In addition, it is set so as not to be positioned on the same surface 85e orthogonal to the rotation center line L of the casing 50. That is, the ground portion that is not excavated between adjacent excavation bits 8f in one second excavation bit group 810 can be excavated by each excavation bit 8f of the other second excavation bit group 810. In short, each of the rotary excavating bodies 46A has a complementary pair of second second holes that enable excavation of a ground portion that cannot be excavated by one second excavation bit group 810 using the other second excavation bit group 810. It is the structure provided with the excavation bit group 810; 810.
Then, as shown in FIG. 15 (a), the first distance 80x (that is, the first distance) 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. A second radius 81x (that is, a second radius) from the rotation center line L of the casing 50 to the tip of the second drill bit 8f via a line orthogonal to the rotation center line L. The excavation radius by the excavation 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 head pipe 6 (between the inner wall surfaces of one pair of wall surfaces of the head pipe 6). The excavation diameter by the second excavation bit 8f, which is set to be smaller than the dimension 9x and the second distance 81x is the excavation radius, is based on the dimension 9x between the upper and lower inner wall surfaces 6c; In addition, the rotary excavator 46A is configured to be movable in front of the top tube 6 and inside the top tube 6 through the tip opening 6t of the top tube 6.
That is, the first excavation body 46A passes through the pipe 2 because the rotary excavation body 46A is set to have a rotation radius dimension that allows the rotation excavation body 46A to rotate around the rotation center line L inside the leading pipe 6. The excavating machine 26 can be withdrawn back to the guide shaft A and collected.
Further, the second distance 81x is such that the rotary excavator 46A cannot rotate around the rotation center line L inside the head pipe 6 and the rotary excavator 46A is positioned in front of the tip opening 6t of the head pipe 6. When set, the rotation radius is set to be rotatable.
That is, the rotary excavation body 46A is rotationally driven in a state where the rotary excavation body 46A is positioned in front of the front end opening 6t of the top pipe 6, whereby the first excavation bit 8e and the second excavation bit 8f are The ground at the front position can be excavated, and the rotary excavator 46A can pass through the pipe 2 (the leading pipe 6 and the succeeding pipe 7) so that the pipe 2 can be collected in the guide shaft A.
By providing the rotary excavating body 46A as described above, a hole having a cross-sectional area larger in the vertical width than that of the front end opening 6t can be excavated in front of the front end opening 6t of the front pipe 6, so that the front end of the front pipe 6 The ground can be excavated before the opening edge collides with the ground, and the pipe 2 can be pushed more smoothly.
Further, when the excavating machine 26 is collected, the tip of the second excavation bit 8f of the second excavation bit group 810 is the same as the upper and lower inner wall surfaces 6c; 6d of the top pipe 6, as shown in FIG. After the state where the plane is not located above the position indicating the plane, the rotary excavation body 46A is pulled back into the pipe 2 and collected in the excavation machine 26 guide shaft A.

  That is, according to the ninth embodiment, the first distance 80x (that is, the first excavation) 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. The second distance 81x (that is, the second excavation bit 8f) from the rotation center line L of the casing 50 to the tip of the second excavation bit 8f via the line orthogonal to the rotation center line L. The excavation diameter by the first excavation bit 8e with the first distance 80x as the excavation radius is the upper and lower inner wall surfaces of the guide blade pipe 9 (see FIG. 8) of the leading pipe 6. 6c; the drilling diameter by the second drilling bit 8f with the second distance 81x as the drilling radius is set to be larger than the dimension 9x between the upper and lower inner wall surfaces 6c; The rotary excavation body 46A was provided. For this reason, the rotary excavator 46A positioned in front of the front end opening 6t of the top pipe 6 is rotated and the excavation bit 8e; 8f excavates the ground, so that the front pipe 6 is positioned in front of the front end opening 6t of the top pipe 6. The width of the square section of the front end opening 6t of the leading pipe 6 (the width dimension corresponding to the radial direction of the rotary excavator 46A, for example, the upper and lower inner wall surfaces of the leading pipe 6) It is possible to excavate a hole with a square cross section having a width dimension larger than the dimension 9x) between 6c and 6d. Therefore, the ground located in front of the front end opening 6t of the front pipe 6 can be reliably excavated by the excavation bits 8e; 8f before the front end opening edge of the front pipe 6 collides with the ground. It is possible to prevent a situation in which the edge collides with the hard ground and the front pipe 6 cannot be pushed, and the pipe 2 can be pushed more smoothly even when the ground is a hard ground.

The tip positions of the respective excavation bits 8 f of the second excavation bit groups 810; 810 provided at positions 180 ° apart from each other in the circumferential direction on the outer peripheral surface 51 of the enclosure 50 are the rotation centers of the enclosure 50. It is set so as not to be positioned on the same surface 85e orthogonal to the line L. That is, a pair of second excavation bit groups 810; 810 provided at positions 180 ° apart from each other in the circumferential direction on the outer peripheral surface 51 of the casing 50 is rotated by the second excavation body 46A. 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 section having a larger width dimension than the width dimension of the square section of the tip opening 6t of the leading pipe 6 is formed. A hole can be excavated efficiently and the pipe 2 can be propelled more smoothly.
Further, by arranging the second excavation bit groups 810, for example, at equal intervals on the outer peripheral surface 51 of the housing 50 around the rotation center line L, the rotational center of gravity of the rotary excavator 46A can be kept constant. Thus, the rotation of the rotary excavator 46A becomes smooth and can be excavated efficiently, and the pipe 2 can be propelled more smoothly.
In addition, since the second excavation bit 8f and the first excavation bit 8e are provided, a hole having an excavation diameter with the second distance 81x as the excavation radius is made more efficient by the second excavation bit 8f and the first excavation bit 8e. Can be excavated.

The second excavation bit group 810 may be configured by an aggregate of second excavation bits 8f individually attached to 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 individual second linearly or non-linearly in the direction along the rotation center line L across both end faces in the direction along the rotation center line L of the housing 50. The excavation 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. Rotating excavator 46A having a second excavating bit having one excavating blade extending linearly or non-linearly in the direction, the rotating excavator 46A being inside the pipe 2 and rotating centerline L It is only necessary to be configured so that it is not rotatable around the center and is rotatable at a position in front of the tip opening 6t of the top tube 6.
Further, the second excavation bit group 810; 810 may not be provided at positions 180 degrees apart from each other in the circumferential direction on the outer peripheral surface 51 of the housing 50.
In short, the rotary excavator 46A has a first distance 80x from the rotation center line L to the tip of the first excavation bit 8e via a line orthogonal to the rotation center line L, and the rotary excavator 46A is located inside the pipe 6. The second radius 81x from the rotation center line L to the tip of the second excavation bit 8f passing through the line orthogonal to the rotation center line L is set to a rotation radius that can rotate around the rotation center line L. When the body 46A cannot rotate around the rotation center line L inside the pipe 2 and the rotary excavation body 46A is positioned in front of the tip opening 6t of the top pipe 6, it rotates around the rotation center line L. What is necessary is just to set to the possible rotation radius.

Further, the rotary excavator may be configured not to include the first excavation bit 8e. That is, you may use the rotary excavation body which has only the 2nd excavation bit 8f as an excavation bit.
In short, in the case where the rotary excavator 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 excavator passing through a line orthogonal to the rotation center line L. The first distance, which is the distance, is set to a rotation radius that allows the rotary excavator to rotate around the rotation center line L inside the pipe 6, and passes through a line perpendicular to the rotation center line L from the rotation center line L. The second distance 81x to the tip of the second excavation bit 8f is such that the rotary excavator cannot rotate around the rotation center line L inside the pipe 2 and the rotary excavator is located at the tip opening 6t of the leading pipe 6. What is necessary is just to set to the rotation radius which can rotate centering | focusing on the rotation center line L when it is located ahead.
That is, the diameter of the casing 50 with the first distance as the radius is set to be smaller than the dimension between the upper and lower inner wall surfaces 6c; 6d of the top pipe 6, and the second distance 81x is the second digging radius. Since the excavation diameter by the excavation bit 8f is set to be larger than the dimension 9x between the upper and lower inner wall surfaces 6c; 6d of the front pipe 6, the rotary excavator 46A opens the tip opening 6t of the front pipe 6. It is configured to be movable in front of the leading pipe 6 and inside the leading pipe 6.
According to the ninth embodiment, a direction perpendicular to, for example, the upper and lower inner wall surfaces 6c; 6d (one pair of wall surfaces of the leading pipe 6) of the leading pipe 6 in front of the leading pipe 6 by excavation by the second drilling bit 8f. Since the underground 10 can be excavated at a wider vertical width interval than the vertical interval of the leading pipe 6 and the front pipe 6 can be excavated in the vertical width direction of the leading pipe 6 in front of the leading pipe 6, Even when the mountain is hard ground, the pipe 2 can be propelled more smoothly.

  In the case where the pipe 2 is installed in the underground 10 using the pipe installation device provided with the rotary excavation body 46A of the ninth embodiment, a cross-sectional area wider than the cross-sectional area of the top pipe 6 is provided in front of the top pipe 6. Can drill. That is, since the underground pipe 10 in front of the leading pipe 6 can be dug in the underground pipe 10 on the upper and lower sides of the leading pipe 6, for example, the above-mentioned pipe rear end movement phenomenon is likely to occur. Therefore, when the pipe 2 is installed in the ground 10 using the pipe installation device of the ninth embodiment, it is effective to suppress the pipe rear end movement phenomenon described above using the pipe rear end movement restricting means described above. It is.

Embodiment 10
If the pipe installation device provided with the rotary excavator 46A of the ninth embodiment and the excavating machine swing drive device 250 of the eighth embodiment is used, the ground on the top, bottom, left and right sides of the top pipe 6 in the ground 10 in front of the top pipe 6 is used. Since the middle 10 additional moats are 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 ninth embodiment, it is effective to suppress the pipe rear end movement phenomenon described above using the pipe rear end movement restricting means described above. It is.
Further, when the pipe installation device provided with the rotary excavation body 46A of the ninth embodiment and the excavating machine swing drive device 250 of the eighth embodiment is used, the pipe 2 can be smoothed even if the ground is a hard ground layer or a rock layer. Can be promoted.

Embodiment 11
As the tube 2, a tube 2 provided with a tube main body and a hollow tube (not shown) provided on the outer surface of the tube main body so as to extend the pipe line along the tube extending direction may be used. If the pipe 2 provided with the hollow tube is used, even after the concrete is buried in the pipe body, the ground improvement material is injected into the ground around the pipe 2 using the hollow pipe as an injection pipe. Will be able to.

  As a method for transmitting the propulsive force of the propulsion device such as the hydraulic jack 62 to the pipe 2, a non-illustrated propulsive force transmitting member protruding rearward from the rear end opening of the tube 2 may be provided. You may make it press the rear-end surface of the pipe | tube 2 directly.

Further, as the excavating machine 26, a water jet device (high pressure water injection device), a rotary excavator having the center axis of the pipe 2 as a rotation center, or the like may be used.
For example, if the pipe 2 has a rectangular cross section, the excavating machine 26 is preferably used. However, if a pipe having a square cross section is used, a water jet device (high pressure water injection device) is used as the excavating machine. It may be used, a rotary excavator having the center axis of the tube 2 as the center of rotation, or a combination thereof. For example, a rotary excavator having the center axis of the pipe as the center of rotation is installed at the center of the front opening of the top pipe 6, and an injection nozzle of a water jet device is installed at the corner of the front opening of the top pipe 6. In addition, the cross-sectional shape referred to in the present invention is a quadrangular shape including a shape in which square corners are chamfered.

When the pipe 2 is not lifted by the state of the underground 10, for example, a hard ground layer or a rock layer, the pipe rear end movement restricting means 200 may not be used.
Further, the tube 2 may be a tube having a circular cross section. A propulsion device other than the hydraulic jack 62 may be used as the propulsion device.

  As the pipe installation device used for implementing the tunnel construction method described in the first and second embodiments, the pipe installation device having the configuration described in the third to eleventh embodiments may be used individually, or the third embodiment. A tube installation device having a configuration in which the features of the tube installation device described in the eleventh embodiment are variously combined may be used.

  Further, in the present invention, the work for forming the invert concrete by the above-described invert concrete construction method and the work for excavating the ground above the place where the invert concrete is to be formed to form the tunnel cavity are performed simultaneously. It may be. That is, if the invert concrete forming operation and the tunnel cavity forming operation are performed simultaneously and the invert concrete forming operation is completed before the tunnel cavity forming operation is completed, the tunnel can be closed early. As a result, the tunnel construction time can be shortened.

10 underground, A shaft, B; BX invert concrete, C pipe,
C1 concrete, CX support work, E tunnel upper half cavity, T tunnel,
TR tunnel construction site, inner wall of TU tunnel cavity.

Claims (7)

  After forming a guide pit along the extension direction of the tunnel planned to be constructed at the bottom of the tunnel construction planned site, a pipe with a square cross section is advanced from the guide shaft into the ground and the pipe is installed underground. An invert concrete construction method characterized in that invert concrete is formed by filling concrete in a pipe installed in a pipe.   The invert concrete construction method according to claim 1, wherein the invert concrete is formed in a plate shape that functions as a preceding lining having an equal thickness of a cross-sectional arch shape extending in the extension direction of the tunnel.   The invert concrete according to claim 1 or 2, wherein the invert concrete is formed by filling the pipe in which the support is installed after the support is installed in the pipe installed in the ground. Concrete construction method. The shaft is located at the center between the left and right widths of the tunnel to be constructed at the bottom of the tunnel construction site, and is formed to extend along the extension direction of the tunnel to be constructed,
The pipes installed in the ground so as to straddle the guide pit and the underground position corresponding to the lower end position of the inner wall of the tunnel cavity through the side wall of the guide mine are adjacent to each other along the extension direction of the tunnel to be constructed. The invert concrete construction method according to any one of claims 1 to 3, wherein a plurality of the concrete is disposed in the ground.   After forming the invert concrete by the invert concrete construction method according to any one of claims 1 to 4, the tunnel main pit was formed by excavating a natural ground above the invert concrete formed in the ground. A tunnel construction method characterized by this.   An operation for forming invert concrete by the invert concrete construction method according to any one of claims 1 to 4, and an operation for excavating a natural ground above a place where the invert concrete is to be formed to form a tunnel cavity. A tunnel construction method characterized by the fact that it is performed simultaneously. The upper half of the tunnel is excavated to form the upper half cavity of the tunnel construction site, the upper support is formed on the inner wall surface of the tunnel upper half cavity, and the bottom is formed on the bottom of the tunnel upper half cavity. After forming the upper half support on the inner peripheral surface of the tunnel upper half cavity by forming the support, and closing the tunnel upper half cavity,
The lower end of the upper support and the invert concrete formed on the inner wall of the upper half cavity of the tunnel by excavating a ground between the lower end of the inner wall of the upper half cavity of the tunnel and the end of the invert concrete The tunnel is closed by forming a support on the lower end side of the inner wall surface of the tunnel cavity so as to connect the end of
After that, the main tunnel was formed by removing the bottom support work provided on the bottom of the upper half cavity of the tunnel, excavating the lower half of the tunnel, and removing the guide shaft The tunnel construction method according to claim 5 or 6.

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