JP2891915B2 - Tunnel connection method and tunnel connection segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel connecting method and a tunnel connecting segment, and more particularly, to excavating and widening the ground between adjacently excavated tunnels at a predetermined interval to connect the tunnels. To a tunnel connection method and a tunnel connection segment.

[0002]

2. Description of the Related Art Generally, an urban tunnel has a higher construction cost than an above-ground structure, and its maintenance cost is often more uneconomical than an above-ground road. For this reason, underground roads are often constructed in unavoidable places, and the tunnel section is usually as short and as shallow as possible to shorten the approach portion.

[0003] When constructing an underground tunnel,
Generally, the excavation method is often adopted, but in recent construction, the number of cases where the excavation method cannot be adopted due to the roadside environment tends to increase.

[0004] When the open-cutting method cannot be adopted,
It is common practice to adopt a shield method.
In the current shield method, the circular cross section is the basic cross section,
At present, the maximum diameter reaches 14 m, and a large-diameter shield having a diameter of about 19 m is currently being planned.

[0005]

When the above-mentioned circular shield having a large diameter is employed, the cost of machine production becomes huge,
There was a problem that it was difficult to adapt to the construction environment in a large city, such as an increase in machine weight, an increase in segment weight, and the securing of a shaft shaft site.

Further, in the case of a shield having a large diameter, a large cover is required, and the approach portion becomes long. Therefore, it is difficult to employ a shield having a relatively small cover.

Further, there is a problem that the tunnel section cannot be freely enlarged or reduced.

In addition, there is a problem that a shield machine and ground facilities are excessively large for a middle section tunnel or a short section tunnel of about several hundred meters in length.

Therefore, it is conceivable to cope with the above-described problem by excavating tunnels adjacent to each other using a relatively small shield machine having a rectangular cross section and connecting the adjacent tunnels.

In this case, when connecting the tunnels,
There was a problem that it was necessary to excavate the ground between the tunnels, and for that purpose, countermeasures against earth pressure and waterproofing had to be taken.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to reduce machine manufacturing costs, reduce machine weight and segment weight, and to secure land for shafts, etc. It can be easily adapted to the environment, requires little earth covering, and can easily deal with the installation of facilities such as enlargement and reduction of the tunnel cross section, branching and merging, and emergency parking zones at regular intervals. The shield machine does not become too large even for middle- and short-distance tunnels of about 100 m, and it is possible to excavate the ground between tunnels while taking measures against earth pressure and water stoppage. To provide a connection method and a tunnel connection segment.

[0012]

In order to achieve the above-mentioned object, the invention according to claim 1 excavates and widens the ground between rectangular cross-section tunnels that are adjacently excavated at a predetermined interval, A tunnel connection method for connecting tunnels, in which a retaining plate is pressed into a ground between tunnels from at least one segment constituting the tunnel to cover the ground between the tunnels, and a water stop and a pier are formed. Performing a step of excavating the ground surrounded by the retaining plate to widen and connect a tunnel, and the retaining plate is reinforced with a beam material to form a cantilever beam. It is characterized by the following.

According to the first aspect of the present invention, the retaining plate is press-fitted from at least one of the segments into the ground between the tunnels to cover the ground between the tunnels, and the water is stopped and the retaining is performed. In addition, it is possible to reliably perform water stopping and piercing, and thus it is possible to easily perform widening of the ground surrounded by the pier plate under the state of reliable water stopping and piercing. .

[0014] By providing a beam material to the retaining plate and reinforcing it to form a cantilever, it is possible to stably insert the retaining plate into the ground, and furthermore, when the retaining plate is inserted, Even if the soil water pressure of the mountain is high, the bending of the retaining plate can be prevented by the beam material, and the water blocking property of the long hole can be maintained by the water stopping material.

According to a second aspect of the present invention, there is provided a tunnel connecting segment used for excavating and widening a ground between adjacently excavated tunnels at a predetermined interval to connect the tunnels, A segment main body having a rectangular cross section, a retaining plate slidably provided on the outer surface of the skin plate at a position opposite to the rectangular cross section of the segment main body, and the fixing plate disposed in the segment main body and press-fitting the ground retaining member into the ground. Slide driving means, wherein the skin plate has an elongated hole extending in a direction orthogonal to the axial direction of the segment body, and the outer peripheral surface of the elongated hole penetrating the skin plate is formed with the ridge plate. A water-stopping material for stopping water is provided, and the retaining plate has a connection portion facing a long hole of the skin plate and connected to a slide driving means through the long hole, and And characterized in that it constitutes a reinforced by the cantilever in wood.

According to the second aspect of the present invention, the waterproof material is provided on the outer peripheral surface of the long hole for the retaining plate slide formed on the skin plate, so that the waterproof material can be reliably provided regardless of the existence of the long hole. It is possible to stop the water, and furthermore, it is possible to easily slide the buckle plate by connecting the slide driving means to the screw hole facing the long hole formed in the buckle plate.

[0017] By providing a beam on the buckle and reinforcing it to form a cantilever, it is possible to stably insert the buckle into the ground. Even if the soil water pressure of the mountain is high, the bending of the retaining plate can be prevented by the beam material, and the water blocking property of the long hole can be maintained by the water stopping material.

According to a third aspect of the present invention, in the first aspect, the retaining plate is pressed into the ground between the tunnels from the mutual segments constituting the adjacent tunnels, and the tip portions of the beams are superimposed. A bolt is inserted into a bolt screw portion formed in the beam material in a lateral direction to connect the adjacent beam materials.

According to a fourth aspect of the present invention, in the second aspect, the beam has a bolt screw portion formed in a lateral direction, and is overlapped with the beam of another segment constituting an adjacent tunnel. It can be connected.

According to the third and fourth aspects of the present invention, the bolt member is formed in the beam member in the lateral direction. The bolt screw portion includes a hole and a female screw through which the bolt is inserted, and the overlapped beam member can be connected by the bolt. Moreover, since the bolted portion is formed in the horizontal direction, less water leakage is required as compared with the case where the bolted portion is formed in the vertical direction.

According to a fifth aspect of the present invention, in the second or fourth aspect, the segment main body includes four plate-shaped segment pieces at upper and lower portions and both side portions, and four corners provided at corner portions. A corner piece, wherein the corner piece is formed in a plate shape arranged on the same plane as the upper and lower segment pieces, and a skin plate provided on the outer surface is a side segment segment. The end portion on the piece side has a bent portion bent at a predetermined curvature to the side of the segment piece on the side.

According to the fifth aspect of the present invention, since the corner piece has a plate shape disposed on the same plane as the upper and lower segment pieces, it is bent in an L shape or the like. Compared with complicated shapes, it can be easily assembled at the time of assembly and construction.Moreover, only forming a bent portion with a predetermined curvature at the end of the skin plate does not require complicated processing, processing Costs can be reduced.

According to a sixth aspect of the present invention, in the fifth aspect, one of the pair of corner pieces disposed on the same plane of the upper and lower portions has one wide portion and the other portion has a small width, and the pair of corner pieces has a narrow width. Adjacent corner pieces of the adjacent segment bodies are wide on one segment body side and narrow on the other segment body side.

According to the sixth aspect of the present invention, since the joining portions of the corner pieces of the segment bodies adjacent to each other in the excavation direction are not aligned but alternate with each other, it is possible to improve the strength of the connected segments. it can.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 10 show a tunnel connection segment according to an embodiment of the present invention. The segment 10 for tunnel connection includes a segment body 12
And a retaining plate 14.

A feature of the present invention is that the retaining plate 14 has a structure that is hardly bent by the beam member 14a (see FIG. 7).

The segment body 12 is made of steel having a substantially rectangular cross-section and chamfered corners, and is disposed at four plate-like segment pieces 16 and 17 at the upper and lower portions and both side portions, and at the corner portions. And four corner pieces 18.

The upper and lower plate-shaped segment pieces 16
The main girder 20a and the joint plate 20b made of a mold steel are framed in a rectangular shape, a skin plate 22 made of a steel plate is attached to one side thereof, and a plurality of ribs 24 are provided between the main girder 20a.

The plate-shaped segment pieces 17 on both sides are
The main girder 20a and the joint plate 20b made of a mold steel are framed in a rectangular shape, and a plurality of channel-like mold steels 21 are removably attached between a pair of main girder 20a facing each other. The reason for the detachable structure is to connect the adjacent segment bodies 12 to each other as described later, and it is not necessary to be able to be removed at places where there is no need to connect.

The corner piece 18 includes a substantially L-shaped steel plate 26 with a bend at a bent portion, a main girder 28a and a joint plate 28b mounted around the steel plate 26, and a gap between the main girder 28a. The segment main body 12 is formed by connecting the joint plate 28b located on the longitudinal side and the main girder 20 of the adjacent segment piece 16 with the plurality of attached ribs 30.

The joint plate 20b of the segment pieces 16 and 17 and the joint plate 28a of the corner piece 18 have through holes through which a stress material such as a reinforcing bar or a PC steel bar for connecting adjacent members is inserted. (Not shown) are formed, and through-holes 36 are also formed at predetermined intervals in the steel plate 26 of the corner piece 18.

A cover is attached to the through hole 36 formed in the steel plate 26, and the cover is removed when the tunnel is widened, so that the hole can be used as an injection hole for improving the ground at the connection portion of the tunnel. I have.

The retaining plate 14 is provided so as to be slidable on the outer sides of the skin plates 22 facing the segment body 12. In this embodiment, the outer surface of the skin plate 22 located on the upper and lower surfaces of the segment body 12 is provided. A steel plate 14 is provided so as to be slidable so that the tunnel can be widened in the lateral direction.

When the tunnel is to be widened in the vertical direction, the buckling plate 14 is slidably provided outside the skin plates 22, 22 facing each other on the side surface of the segment main body 12, and the buckling plate 14 is moved in the vertical direction. By sliding, the width of the tunnel can be increased and decreased.

As a feature of this embodiment, a beam member 14a is provided on the retaining plate 14. This beam member 14a is shown in FIG.
As shown in FIG. 8, the corner piece 26 and the segment piece 16 (see FIG. 8) are sandwiched from both sides so that
, And is formed in a U-shape which is rotated to the left by 90 degrees between the ridge plate 14 and the beam member 14a. The corner piece 26 and the segment piece 16 have beam members 14.
By providing the guide plate 14b according to the thickness of a, the guide plate 14 can be used as a guide when the retaining plate 14 is slid.

By the presence of the slide guide, the retaining plate 14 can be prevented from being lowered forward due to the movement, and the retaining state between the retaining plate 14 and the skin plate 22 can be maintained. The water stopping effect of the water material 42 can be further enhanced. And, by preventing the forward falling state, the retaining plate 14 can further enhance the effect as a cantilever.

The beam member 14a is made of a steel material such as a thick plate, and is supported by the provision of the beam member 14a so that the buckle plate 14 is not bent. Function. Therefore, the ground 72 (FIG. 1) can be provided without providing a means for supporting the retaining plate 14 separately.
4) can be supported. However, if the means for supporting the buckle plate 14 is provided in addition to this, the strength is further increased. As shown in FIG. 2, a pair of long holes 38 extending in a direction orthogonal to the axial direction of the segment main body 12 are formed in the skin plate 22 provided with the ridge plate 14. 22 long holes 3
Screw hole 40 as a connection part of the slide drive means facing
Are formed at predetermined intervals. And this slot 3
A waterproof material 42 is provided on the outer peripheral surface of 8 to stop the water between the retaining plate 14 and the retaining plate 14. This waterproof material 42
As shown in FIG. 4, the long hole 3 is formed with the joining plate 44 as the groove bottom.
8 is fitted in a mounting groove 46 formed on the outer periphery of the portion 8 in a partially protruding state, and a rubber ring is used as the water-stopping material 42, for example.

Further, as shown in FIG. 2, the screw hole 40 of the retaining plate 14 has a length L1 of the long hole 38 of the skin plate 22.
It is formed at a shorter interval L2 and at a position beyond the formation region of the long hole 38.

The skin plate 22 has a long hole 3
As shown in FIG. 5, a joint bolt mounting hole 48 for fixing the buckle plate 14 is formed corresponding to the screw hole 40 at a position beyond the formation region of the joint bolt 8. Is inserted and screwed into the screw hole 40 so that the ridge plate 14 can be fixed to the skin plate 22.

After the joining bolt 50 has been removed,
As shown in FIG. 6, the lid 52 can be closed by screwing, and when necessary, the lid 52 can be removed and used as a backfilling agent injection hole.

FIGS. 9 and 1 show slide driving means.
As shown in FIG. 0, a hydraulic jack 54 is used. The hydraulic jack 54 is attached to the inside of the segment pieces 16, 16 located at the top and bottom, and is provided with a retaining plate connecting jig 56 at the tip, and a bolt 58 provided on this retaining plate connecting jig 56 is attached to the retaining plate 14. Can be screwed into the screw hole 40. Thus, by operating the hydraulic jack 54, the retaining plate 14 can be slid.

Then, after the retaining plate 14 is slid within the range of the length L 1 of the long hole 38, the bolt 58 is attached to the screw hole 40 facing the inside of the long hole 38, and the sliding is performed sequentially. Also, a sufficient slide amount of the retaining plate 14 can be ensured even with the short slot 38.

Further, by shortening the long holes 38, it is possible to improve the water stopping performance by reducing the water stopping area. At the rear end of the hydraulic jack 54, as shown in FIG. 9, a reaction force receiving member 59 which is in contact with the joint plate 20b as a force-bearing member is attached, and is attached to the joint plate 20b via the reaction force receiving member 59. A reaction force at the time of press fitting of the retaining plate 14 is provided. As the bearing member, in addition to the joint plate 20b, it is also possible to use a reinforced rib.

FIGS. 17 and 18 show a modification of the segment body.

The segment body 110 has four plate-like segment pieces 112, 11 at the upper and lower portions and both side portions.
4 and four corner pieces 11 arranged at the corners
6, 118, and the corner piece 116,
It is characterized by facilitating the processing and assembling of 118 and improving the strength at the time of joining.

The segment pieces 1 at the top and bottom and both sides
12 and 114 have substantially the same structure as the segment pieces 16 and 17 described above, and are different in that the length of the segment pieces 114 on both sides reaches the arrangement position of the upper and lower segment pieces 112. Has only become.

The corner pieces 116 and 118 are connected to the main girder 12.
0, a rib 122 and a joint plate 124 are formed as a plate-like member having a skin plate 126 provided on the outer surface thereof, and are arranged on the same plane as the upper and lower segment pieces 112.

The skin plate 126 has a bent portion 12 having a predetermined curvature on the side of the side segment piece 114 and an end thereof on the side of the side segment piece 114.
8 is formed.

As described above, since it is only necessary to bend the skin plate 126 at a predetermined curvature, the processing is easy, the processing cost can be reduced, and the corner piece 11 can be reduced.
6 and 118 are made into a plate shape, and the upper and lower segment pieces 11
By arranging them on the same plane as 4, it is possible to easily assemble them during assembly.

Further, a pair of corner pieces 116 and 118 disposed on the upper and lower portions are formed such that one corner piece 116 is formed as narrow as width W ₁ and the other corner piece 118 is formed as narrow. W ₂ and is formed wide.

Then, as shown in FIG. 18, the adjacent corner pieces of the adjacent segment bodies 110 in the digging direction (the direction of the arrow in the figure) are connected to one segment body 110.
The corner piece 116 has a narrow side, and the other segment body 110 has a wide corner piece 118.

With such an arrangement, the corner pieces 116, 1
Since the bonding portions 18 are not aligned but alternate with each other, the strength in the bonded state can be improved.

The corner pieces at the upper and lower positions, which are disposed at the upper and lower portions, are also configured such that the narrow corner piece 116 and the wide corner piece 118 are opposed to each other.

FIGS. 19 and 20 show a modification of the tunnel connection segment.

In the tunnel connecting segment 10, beam members 14 a are fixed to both ends of the retaining plate 14, and on the segment body 12 side, the corner piece 26 and the segment piece 16 correspond to the thickness of the beam material 14 a. Guide plate 14b is provided, and the buckle plate 14 is slid along the guide plate 14b.

The guide plate 14b, the corner piece 26, and the segment piece 16 are formed with bolt holes 130 for connecting the segment bodies 12 in the direction of excavation. By mounting the seal member 132 over the entire guide plate 14b in the width direction, the seal member 132 is simultaneously tightened at the time of fixing with the bolt at the position of the bolt hole 130,
Sealing can be performed on the bolt hole 130 side.

When the retaining plate 14 is slid in the direction of the arrow in the drawing to widen in the lateral direction, a gap 134 is formed above the guide plate 14b between the adjacent segment bodies 12 in the excavation direction. Are closed by a filler.

Next, a tunnel connection method according to an embodiment of the present invention will be described with reference to FIGS.

First, using a rectangular shield machine, FIG.
As shown in (1), tunnels 70, 70 are constructed by assembling and connecting the tunnel connection segments 10 while excavating two adjacent tunnels 70 at predetermined intervals.

Next, if necessary, as shown in FIG.
The ground improvement of the ground 72 above and below the widened portion of the tunnel 70 is performed from inside the tunnel 70. In this case, the injection pipe 74 is inserted into the ground 72 through the through-hole 36 formed in the steel plate 26 of the corner piece 18 constituting the segment main body 12, and a ground improvement chemical is injected into the ground 72 to form the ground. Make improvements.

Next, as shown in FIG. 13, the joint bolt 50 which is inserted through the joint bolt mounting hole 48 (see FIG. 5) and screwed into the screw hole 40 of the joint plate 14 is removed, and the fastening plate 14 is removed. Is press-fitted from above and below each of the tunnel connecting segments 10 into the ground 72 where the ground has been improved, so that the tip portions of the buckle plates 14 overlap. If necessary, a backfill agent is injected into the surrounding ground 72 through the joint bolt mounting hole 48. After injecting the backfilling agent, the lid 52 may be attached to the joint bolt attachment hole 48 and water may be stopped.

Further, a bolt 58 provided on the buckle plate connecting jig 56 at the tip of the hydraulic jack 54 (see FIG. 9) is screwed into a screw hole 40 facing the long hole 38 (see FIG. 3) of the skin plate 22. Activate the hydraulic jack 54 and sequentially turn the long holes 38
By operating the hydraulic jack 54 while replacing the retaining plate connecting jig 56 with the screw hole 40 facing the hole, the retaining plate 14 is press-fitted at a predetermined distance.

In this case, since the long hole 38 is short, the water stop area is small, and the water stop is improved. Furthermore,
The reaction force at the time of press-fitting the retaining plate 14 by the hydraulic jack 54 is applied to the joint plate 2 via the reaction force receiving member 59 (see FIG. 9).
Since 0b is received, it is possible to obtain a sufficient pressure input.

When the retaining plate 14 is pressed into the ground 72, the beam 14 a fixed to the retaining plate 14 is attached to the retaining plate 14.
The guide plate 14b serves as a guide to prevent the buckle plate 14a from moving forward and downward, and maintain the close contact between the buckle plate 14 and the skin plate 22. Thus, the water stopping effect of the water stopping material 42 can be reliably maintained.

If it is necessary to stop the water at the overlapping portion of the retaining plates 14, a through hole 36 of the steel plate 26 is opened, and a water-stopping agent is injected by inserting an injection pipe to surely stop the water. I do it.

Next, as shown in FIG.
Wide excavation is performed on the ground 72 between the tunnels 70 surrounded by. In this case, the channel-shaped steel plate 21 is removed from the plate-shaped segment piece 17 on the side of the segment body 12 facing the widening ground 72, and the side is opened.
Then, the ground between the tunnels 70 is widened and excavated from the open side using an excavator such as a mini backhoe.

Next, in a state where the ground 72 has been completely excavated, the beam members 14a of the adjacent retaining plates 14 are bolted together as shown in FIG. 16, and as an example, as shown in FIG. The main girder 2 of the segment piece 17 in the adjacent connection segments 10 using the steel plate 21 of FIG.
At the same time, the PC steel bars (not shown) are inserted into the through holes 36 of the corner piece 18 and tightened, and a necessary axial force is applied to the PC steel bars to fix them.

By repeating such a process, a tunnel having an arbitrary width and having expansion and contraction can be easily formed. For example, a tunnel having a large cross section can be formed. In the case of forming as a wall surface, high-flow concrete is poured into the inside and the widened portion of the tunnel 70, and the concrete is secondarily injected into an upper gap, thereby completing the tunnel.

By using such a tunnel connection method, for example, a plurality of small-section rectangular tunnels 70 are excavated at predetermined intervals along the contour of the tunnel using a rectangular shield machine, and the tunnels are excavated. After widening and excavating the ground between the 70s, the tunnels 70 are connected to each other, and concrete 78 is cast inside to construct the wall 80.
Excavation of the mountain surrounded by
Can be constructed. In addition, this tunnel 82
Can have various shapes such as a convex shape, a concave shape, an L shape, and a T shape.

The present invention is not limited to the above embodiment, but can be modified into various embodiments within the scope of the present invention.

For example, in the above embodiment, the case where the hydraulic jack is used as the slide driving means of the retaining plate has been described. However, the present invention is not limited to this example. For example, a pile driving machine is fixed to the segment main body, and It is possible to use various slide driving means in addition to sliding the leading end to the buckle plate.

Further, the ridge plate is made to protrude from both of the adjacent tunnel connection segments. However, the present invention is not limited to this. When the widening width is small, only one of the tunnel connection segments is used. It is also possible to make the plate protrude.

Further, when excavating the ground between the upper and lower tunnels, the retaining plate is inserted into the ground from both sides of the segment main body, and the soil material on the side is removed to be surrounded by the retaining plate. It is also possible to excavate a rocky mountain.

Further, in the above embodiment, the buckle plate 14 and the beam member 14a are formed in a U-shape as shown in FIG. 7, but the present invention is not limited to this. A beam 14a may be provided slightly inside the plate 14. further,
The number of the beam members 14a is not limited to two but may be three or more.

Further, the buckle plate 14 and the beam member 14a may be manufactured as a unit having a U-shaped cross section.

[0077]

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a tunnel connection segment according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a partially enlarged view in a state where a retaining plate of FIG. 2 is removed.

FIG. 4 is an enlarged sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is an enlarged cross-sectional view of a joining bolt attachment state at a joining bolt attachment hole position of the segment main body.

FIG. 6 is an enlarged sectional view showing a state where a joining bolt is removed from the state of FIG. 3 and a water blocking cap is attached.

FIG. 7 is a side view showing a state of a slide guide of the segment main body.

FIG. 8 is a front view showing a state of a slide guide of the segment main body.

FIG. 9 is a cross-sectional view showing a state where the hydraulic jack is attached to the segment main body.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a cross-sectional view showing a state where a tunnel is excavated adjacently at a predetermined interval.

FIG. 12 is a cross-sectional view showing a state in which ground improvement of the ground at the connection portion has been performed.

FIG. 13 is a cross-sectional view showing a state in which the retaining plate is inserted into the ground.

FIG. 14 is a cross-sectional view showing a state where ground excavation between tunnels is performed.

FIG. 15 is a sectional view showing a state in which segments are connected to each other.

16A and 16B are views showing a state where adjacent segments are joined to each other, wherein FIG. 16A is a plan view and FIG. 16B is a cross-sectional view taken along line AA in FIG.

FIG. 17 is a sectional view showing a modification of the segment main body.

FIG. 18 is a plan view showing a connected state of the segment main bodies of FIG. 17;

FIG. 19 is a partial perspective view showing another modification of the tunnel connection segment.

20 is an enlarged sectional view taken along line XX-XX in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tunnel connection segment 12, 110 Segment main body 14 Clamp plate 14a Beam material 16, 112 Segment piece 18, 116, 118 Corner piece 20a, 28a, 120 Main girder 22, 126 Skin plate 24, 30, 122 Rib 38 Elongated hole 40 Screw hole 42 Waterproof material 48 Joint bolt mounting hole 56 Joint plate connecting jig 58 Bolt 128 Bend portion 130 Sealing material 134 Void

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Makoto Ukegawa 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (72) Inventor Jun Takahashi 1-1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Within Construction Co., Ltd. (72) Inventor Minoru Motoki 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. (56) References JP-A-5-280296 (JP, A) (58) Fields surveyed (Int.Cl. ⁶ , DB name) E21D 13/02 E21D 9/00 E21D 9/06 301 E21D 11/14

Claims (6)

(57) [Claims] 1. A tunnel connection method for connecting tunnels by excavating and widening the ground between adjacent rectangular cross-section tunnels excavated at predetermined intervals, wherein at least one of the tunnels is formed. A step of pressing a retaining plate from the segment to the ground between the tunnels, covering the ground between the tunnels, performing water stopping and retaining, and excavating the ground surrounded by the retaining plate to form a tunnel. Widening and connecting, wherein the retaining plate is reinforced with a beam material to form a cantilever beam. 2. A tunnel connection segment used for connecting tunnels by excavating and widening the ground between adjacently excavated tunnels at predetermined intervals, comprising: a segment body having a rectangular cross section; A buckle plate slidably provided on the outer surface of the skin plate at a position opposite to the rectangular cross section of the segment body, and a slide driving means disposed in the segment body and press-fitting the buckle plate into the ground.
In the skin plate, a long hole extending in a direction orthogonal to the axial direction of the segment main body is formed, and on the outer peripheral surface of the long hole penetrating the skin plate, water stop between the ridge plate is provided. A waterproofing material is provided, and the retaining plate has a connection portion facing the long hole of the skin plate and connected to the slide driving means through the long hole, and is reinforced by a beam material. A tunnel connection segment comprising a cantilever. 3. A beam according to claim 1, wherein the retaining plate is pressed into the ground between the tunnels from the mutual segments constituting the adjacent tunnel, and the tip portions of the beams overlap each other. A bolt is inserted through a bolt threaded portion formed in the above, and the adjacent beam members are connected to each other. 4. The tunnel connection according to claim 2, wherein the beam material has a bolt screw portion formed in a lateral direction, and can be connected by overlapping with a beam material of another segment constituting an adjacent tunnel. Segment. 5. The segment body according to claim 2, wherein the segment main body has four plate-shaped segment pieces at upper and lower portions and both side portions, and four corner piece pieces disposed at corner portions. The corner piece is formed in a plate shape disposed on the same plane as the upper and lower segment pieces, and the skin plate provided on the outer surface has an end on the segment piece side of the side portion. A tunnel connection segment having a bent portion bent at a predetermined curvature on a segment piece side of the side portion. 6. The pair of corner body pieces according to claim 5, wherein one of the pair of corner pieces disposed on the same plane of the upper and lower portions has a wide width and the other has a narrow width, and the segment main bodies are adjacent to each other in a digging direction. 3. The tunnel connection segment according to claim 1, wherein one of the adjacent corner pieces is wide on one segment body side and narrow on the other segment body side.