JP2001012199A - Tunnel waterproof structure and its execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a waterproof sheet to the utmost at the time of excavation and widening by providing water barriers on the inner face of the waterproof sheet corresponding to the boundary sections of adjacent tunnel portions of a multiple tunnel constituted of a plurality of tunnel portions. SOLUTION: After a primary lining is applied to the inner face of the natural ground 1 of three tunnel portions T1, T2, T3, a waterproof sheet is laid. Water barriers 61 extending in the tunnel peripheral direction are provided on the inner face of the waterproof sheet 4 corresponding to the construction joints of adjacent secondary linings 5 in the tunnel longitudinal direction. Water barriers 62 extending in the tunnel longitudinal direction are provided on the inner face of the waterproof sheet 4 corresponding to the boundary sections Ka, Kb of the tunnel portions T1, T2, and water barriers 63 are provided at the intersections of both barriers 61, 62. The contact faces between the waterproof sheet 4 and secondary linings 5 are partitioned by the barriers 61 for each placed span length L of the secondary linings 5 in the tunnel longitudinal direction and by the barriers 62 for each of the tunnel portions T1, T2. Even if the waterproof sheet 4 is broken and water intrudes a contact face, a water leakage can be prevented from spreading in a wide range, and the repairing work is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof tunnel structure and a method of constructing the same. More specifically, the present invention relates to a tunnel waterproof structure and a construction method for a tunnel using a watertight (watertight) type sheet waterproofing method and a multiple tunnel such as a double tunnel or a triple tunnel using a waterproof method.

[0002]

2. Description of the Related Art Conventionally, in a tunnel to which a watertight type sheet waterproofing is generally applied, an inner periphery of an excavated tunnel or a primary lining concrete (hereinafter, simply referred to as a primary lining) constructed on an inner surface of the ground. A waterproof sheet is laid to prevent underground water from entering the tunnel, and as the waterproof sheet, a water-impermeable synthetic resin sheet is generally used. A buffer material such as a nonwoven fabric is interposed between the inner surface of the lining and the lining if necessary.

[0003] It is known that the above sheet waterproofing method is applied to a tunnel by the silott method or a multiple tunnel such as a double tunnel or a triple tunnel. FIG. 11 shows a conventional example applied to a tunnel by the silott method, FIG.
2 is a conventional example applied to a triple tunnel.

[0004] In the tunnel by the silott method shown in FIG. 11, the left and right tunnel portions T1 and T1 called a silotto tunnel are excavated, and a main tunnel portion T2 is inserted between the two tunnel portions T1 and T1. A waterproof sheet 4 is formed on the inner surface of the ground 1 of the tunnel portions T1 and T2 or on the entire inner surface of the primary lining 2 (not shown) constructed through the cushioning material 3 such as a nonwoven fabric. A secondary lining concrete (hereinafter simply referred to as secondary lining) 5 is provided on the inner surface side of the waterproof sheet 4.

In a triple tunnel as shown in FIG. 12, generally, a central tunnel portion T1 is first excavated,
It excavates the tunnels T2 and T2 on both sides,
A waterproof sheet 4 is laid via a cushioning material 3 around the inner surface of the ground of the tunnel portions T1 and T2 or the entire inner surface of the primary lining constructed on the inner surface thereof as in FIG. A secondary lining 5 is provided on the inner surface side.

In the multiple tunnel shown in FIGS. 11 and 12, the strength of the waterproof sheet 4 near the boundary Ka, Kb between the adjacent tunnel portions T1, T2, especially near the upper boundary Ka, tends to be insufficient. In addition, the above-mentioned boundary part is a place where spring water is most likely to accumulate and water leakage is likely to occur. In addition, there is a problem that the waterproof sheet 4 near the boundary portions Ka and Kb is damaged during tunnel excavation.

That is, when constructing a multiple tunnel as described above, for example, a triple tunnel as shown in FIG. 12, the cushioning material 3 and the waterproof material are provided on the inner surface of the ground at the tunnel portion T1 excavated earlier. A sheet 4 is laid, a secondary lining 5 is laid on the inner surface thereof, and then an adjacent tunnel portion T2 is excavated. At this time, a tunnel portion T1 excavated first and a tunnel portion T2 excavated later are used. In the boundary portions Ka and Kb with the dashed line portion C in FIG.
3 (a), the end 4a of the waterproof sheet 4 is shown.
Is provided so as to extend to the tunnel portion T2 side from the boundary portion Ka, and the secondary lining 5 is cast so that the extended end portion 4a is exposed in the tunnel space.

Next, as shown in FIG. 13 (b), an adjacent tunnel portion T2 is excavated, and a cushioning material 3 and a waterproof sheet 4 are laid in the tunnel portion T2.
And the extension end 4a of the previously laid waterproof sheet 4 by welding or the like. When excavating the tunnel portion T2, the extension 4a of the previously laid waterproof sheet 4 is digged. There is a risk that the excavator will be damaged by contact with the excavator.
The damaged waterproofing sheet needs to be repaired, but if it is damaged near the already installed secondary lining, it is practically impossible to apply it.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above problems, and aims to prevent the waterproof sheet laid first during excavation and widening in a multiple tunnel from being damaged as much as possible. It is an object of the present invention to provide a tunnel waterproof structure which can be easily repaired even if it is damaged, and a method of constructing the same.

[0010]

Means for Solving the Problems In order to achieve the above object, a waterproof tunnel structure and a method for constructing the same according to the present invention have the following constructions.

That is, the waterproof structure for a tunnel according to the present invention is a tunnel waterproof structure in which a waterproof sheet is continuously laid in a multiple tunnel composed of a plurality of tunnel portions excavated in a plurality of times. A water barrier is provided on the inner surface of the waterproof sheet corresponding to the boundary between adjacent tunnel portions.

With the water barrier, in the event that the waterproof sheet is damaged or the like and water leaks, it is possible to prevent the leak from spreading over a wide area, and to easily find and repair the leak location. In addition, the waterproof sheet is reinforced by the water barrier, and damage to the waterproof sheet can be reduced as much as possible.

[0013] A protective plate may be provided on the outer surface side (ground side) of the waterproof sheet corresponding to the boundary between the plurality of adjacent tunnel portions as necessary, so that the waterproof sheet may be damaged. It can be further reduced. Further, the water barrier is composed of a sheet-shaped base material and a plurality of ribs integrally provided on the base material, and has a number of holes on a peripheral surface between adjacent ribs as necessary. It is preferable to provide an exhaust injection hose, and in such a case, when placing the secondary lining concrete on the inner surface side of the waterproof sheet, the air accumulated between adjacent ribs is discharged, or after the placement, the injection material or the like is discharged. It is possible to fill the gap by filling.

The method for constructing a waterproof waterproof structure according to the present invention is a method for constructing a waterproof waterproof structure in which a waterproof sheet is continuously laid in a multiple tunnel composed of a plurality of tunnel portions excavated in a plurality of times. A waterproof sheet is laid on the inner surface of the ground of the tunnel portion excavated earlier or on the inner surface of the primary lining concrete cast on the inner surface of the ground, and the waterproofing corresponding to the boundary between the plurality of adjacent tunnel portions is performed. A water barrier is fixed to the inner surface of the seat,
A secondary lining concrete is cast on the inner surface side of the waterproof sheet in a state where an end portion of the waterproof sheet and a part of the water barrier are exposed, and then an adjacent tunnel portion is excavated.

When excavating an adjacent tunnel portion by placing secondary lining concrete on the inner surface side of the waterproof sheet with the end of the waterproof sheet and a part of the water barrier exposed as described above. The excavation work can be performed by retreating the exposed portion from the excavation position, and the waterproof sheet laid in the adjacent tunnel can be easily joined. In addition, the provision of a water barrier on the inner surface of the waterproof sheet reinforces the waterproof sheet as described above, and it is damaged even if the excavator comes into contact when excavating the adjacent tunnel or if the excavated rock fragments hit the waterproof sheet. And so on can be reduced as much as possible.

In addition, a protection plate is disposed on the outer surface of the waterproof sheet corresponding to the boundary between the plurality of adjacent tunnel portions as necessary, and the end of the waterproof sheet and a part of the water barrier are disposed by the protective plate. Excavating the adjacent tunnel portion in a covered state can more reliably prevent the waterproof sheet from being damaged.

The water barrier is composed of a sheet-like base material and a plurality of ribs integrally provided on the base material, and a plurality of holes are formed on the peripheral surface between the adjacent ribs as necessary. When the air between the adjacent ribs is exhausted through the exhaust injection hose when the secondary lining concrete is cast, an air trap is prevented from being generated between the ribs. It becomes possible.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a tunnel waterproofing structure and a method for constructing the same according to the present invention.

FIG. 1 shows an embodiment of a tunnel waterproof structure according to the present invention. FIG. 1 (a) is a cross-sectional view of a tunnel, and FIG. 1 (b) is a view of a waterproof sheet laid on the inner peripheral surface of the tunnel. FIG. 4C is a developed inner view of the bottom part, and FIG. 2 (a) and 2 (b) correspond to FIG.
It is an enlarged view of chain lines A and B in (a).

The present embodiment is applied to a triple tunnel, and the ground 1 of the three tunnel portions T1, T2, T2.
Although not shown in FIG. 1, a primary lining 2 is applied to the inner surface of the base material, and a buffer material 3 made of a nonwoven fabric or the like is provided on the inner surface of the primary lining 2.
The waterproof sheet 4 is laid via the. In the present embodiment, a water-impermeable sheet made of a thermoplastic resin such as polyethylene having a predetermined sheet width W and a sheet thickness of 2 to 3 mm is used as the waterproof sheet 4, and the sheet is cut into a predetermined length. And is integrally connected in the longitudinal direction S of the tunnel and the circumferential direction R of the tunnel sequentially by welding or the like.

The inner surface of the waterproof sheet 4 is shown in FIGS.
As shown in FIG. 5, secondary linings 5 are sequentially placed at each of the tunnel portions T1 and T2 and at a predetermined length (span) L in the longitudinal direction of the tunnel, and the secondary linings 5 adjacent to each other in the longitudinal direction of the tunnel are formed. A water barrier 61 extending in the circumferential direction of the tunnel is provided on the inner surface of the waterproof sheet 4 corresponding to the joint J1 of the work 5.

A water barrier 62 extending in the longitudinal direction of the tunnel is provided on the inner surface of the waterproof sheet 4 corresponding to the boundary Ka, Kb between the adjacent tunnel portions T1, T2.
In the present embodiment, the water barrier 62 also corresponds to a boundary between the secondary linings 5 of the adjacent tunnel portions T1 and T2, that is, a joint J2 of the secondary lining 5 in the tunnel circumferential direction. A cross-shaped water barrier 63 is provided at the intersection of the water barriers 61 and 62.

As shown in FIGS. 2 and 3, each of the water barriers 61 to 63 has a plurality of ribs (projections) 6b integrally provided on one surface of a base material 6a made of a sheet-like thermoplastic resin or the like. In the present embodiment, three ribs 6b each having a height of 30 mm are attached to one surface of a base material 6a having a thickness of 4 mm and made of the same material as the waterproof sheet 4 on both sides in the width direction of the base material 6a. Six are provided.

The ribs 6b of the water barriers 61 and 62 and the ribs 6b of the cross-shaped water barrier 63 are arranged so as to be continuous with each other.
The water barriers 61 to 63 are integrally fixed to the waterproof sheet 4 by, for example, welding a to the inner surface of the waterproof sheet 4.

The contact surface d between the waterproof sheet 4 and the secondary lining 5 is partitioned by the above-described water barrier 61 extending in the circumferential direction of the tunnel at every casting span length L of the secondary lining 5 in the longitudinal direction of the tunnel. The contact surface d between the waterproof sheet 4 and the secondary lining 5 is separated by the water barrier 62 extending in the longitudinal direction of the tunnel for each of the tunnel portions T1 and T2. . Therefore, the contact surface d between the waterproof sheet 4 and the secondary lining 5 is partitioned by the water barriers 61 to 63 in the longitudinal direction of the tunnel for every installation length L of the secondary lining 5, and in the circumferential direction of the tunnel. It is divided into four parts.

Therefore, even if the waterproof sheet 4 is broken and water enters the contact surface d between the waterproof sheet 4 and the secondary lining 5, it is possible to prevent the leaked water from spreading over a wide area. In addition to this, the finding and repair of the water leakage location may be performed within the range partitioned by the water barriers 61 to 63, so that the repair work can be easily performed.

Further, since the water barrier 62 is provided integrally with the waterproof sheet 4 corresponding to the boundary portions Ka and Kb of the adjacent tunnel portions T1 and T2, spring water easily accumulates in the tunnel structure and water pressure is easily applied. The waterproof sheet 4 at the boundary can be satisfactorily reinforced.

If necessary, for example, as shown in FIGS. 2 (a) and 2 (b), a protection made of an iron plate or other metal plate is provided on the ground side of the waterproof sheet 4 corresponding to the boundary portions Ka and Kb. A plate 7 is preferably provided, and in this embodiment, an iron plate having a thickness of 3 mm is provided. The protection plate 7 can more reliably prevent the excavator and the ground pile from contacting the waterproof sheet 4 to be damaged or damaged at the time of tunnel excavation or after tunnel construction described later. In this case, in the case where the cushioning material 3 is provided as in the illustrated example, it is desirable that the protective plate 7 be provided on the ground side of the cushioning material 3 as shown in FIGS. 2 (a) and 2 (b). It may be interposed between the cushioning material 3 and the waterproof sheet 4.

The water barriers 61 and 62, especially the water barriers 61 and 6 disposed above the tunnel.
It is preferable to provide an exhaust injection hose (exhaust grout hose) 8 between the two ribs 6b. In the illustrated embodiment, a water barrier 61 extending in the longitudinal direction of the tunnel has a left and right side as shown in FIGS. Six exhaust injection hoses 8 are provided in total of three, and four exhaust injection hoses 8 are provided in the water barrier 62 extending in the circumferential direction of the tunnel.

Both ends of each of the exhaust / injection hoses 8 pass through the secondary lining 5 and open to the tunnel space side. As shown in FIG. 5, each of the exhaust gas injection hoses 8 is a perforated pipe 81 having a large number of small through holes 81a on its peripheral surface and a braided tube made of a mesh, cloth, or the like coated on the outer peripheral surface. In the case, two types of braided tubes 82 with different braiding methods and braid densities are used.
When the secondary lining 5 is cast, the air is allowed to flow, but concrete is prevented from entering the perforated pipe 81.

Further, the three tunnel portions T1, T
At the top end (uppermost position) of each secondary lining 5 of FIG. 2, an injection material filling hole 9 may be provided as necessary as shown in FIG.
In the present embodiment, a plurality of injection material filling holes 9 are provided at the top end of each of the tunnel portions T1 and T2 at predetermined intervals in the longitudinal direction of the tunnel. The upper end of the filler filling hole 9 opens between the waterproof sheet 4 and the secondary lining 5, and the lower end opens into the tunnel space.

The means for forming the filling material filling hole 9 is appropriate, but in this embodiment, when the secondary lining 5 of each tunnel portion is constructed, the contact grout pipe 91 and the pipe 91 are fitted to the contact grout pipe 91. The filling material filling hole 9 is formed by arranging a round rod-shaped core material 92 in the concrete for secondary lining construction, and pulling out only the core material 92 when the concrete is almost solidified.

The above waterproof structure of the tunnel may be constructed in the following manner, for example. FIGS. 7 to 10 show the construction process, and FIGS. 7A and 7B are enlarged views of portions corresponding to the chain line portions A and B in FIG. 1A, respectively. is there.

In the triple tunnel of this embodiment, as shown in FIGS. 7A and 7B, the middle tunnel portion T1 is first excavated similarly to the conventional example, and A primary lining, a shoring construction, a lock bolt construction, and the like are performed on the inner surface as needed, and a cushioning material 3 is laid on the inner surface of the ground or the primary lining as needed. The means for attaching the cushioning material 3 is appropriate, but in the present embodiment, the disk washer 11 and the anchor nails and bolts 12 are used.
It is attached by a fixing tool 10 made of, for example,.

Next, a waterproof sheet 4 is laid.
It is desirable that the waterproof sheet 4 be fixed without opening a through hole. In the present embodiment, the disk washer 11 to which the cushioning material 3 is attached is made of a synthetic resin of the same material as the waterproof sheet 4, and the waterproof sheet 4 is fixed to the disk washer 11 by welding. In FIG. 7, reference numeral 15 denotes an anchor nail for temporarily fixing the waterproof sheet 4.

Water barriers 61 to 63 are attached to the inner surface of the waterproof sheet 4 by welding or the like as described above.
A water barrier 61 is attached to a position corresponding to the joint J1 in the longitudinal direction of the tunnel, and a water barrier 62 is attached to a position corresponding to the boundary Ka, Kb between the tunnel portion T1 and the tunnel portion T2 to be excavated later. A cross-shaped water barrier 63 is attached to the intersection of the water barriers 61 and 62.

Next, as shown in FIGS. 8 (a) and 8 (b), a secondary lining 5 is cast inside the waterproof sheet 4, and at this time, the two tunnel portions T1,
The end 4a on the boundary Ka, Kb side of T2 is
a and Kb so as to protrude toward the tunnel portion T2 side so that substantially half or more of the water barrier 62 provided corresponding to the extension end 4a and the boundary portions Ka and Kb is exposed to the outside. Next, lining 5 is cast.

At this time, the water barrier 62
If the exhaust gas injection hose 8 is previously arranged between the adjacent ribs 6b, 6b as shown in the figure, the air remaining between the ribs 6b, 6b when the secondary lining 5 is cast is used for the exhaust gas injection. It can be discharged to the outside via the hose 8.

The protection plate 7 is provided as needed on the ground side of the waterproof sheet 4 corresponding to the boundary portions Ka and Kb. In the case where the cushioning material 3 is provided as shown in the example of FIG. As shown in FIGS. 8 (a) and (b),
A protective plate 7 is provided on the ground side or between the cushioning material 3 and the waterproof sheet 4. Then, the exposed portions of the protection plate 7 and the cushioning material 3 and the waterproof sheet 4 and the water barrier 62 are bent and retracted from a tunnel portion T2 to be excavated later.

Next, as shown in FIGS. 9A and 9B, the tunnel portions T2 and T2 are provided on both sides of the tunnel portion T1.
T2 is excavated by an excavator or the like. At this time, if the exposed portion is bent and retracted from the tunnel portion T2 as described above, the excavator or the excavated rock mass is directly or waterproofly placed on the waterproof sheet 4. It can be prevented from hitting through the cushioning material 3 and even if hit, the waterproof sheet 4
The water barrier 62 provided in the
Is reinforced, so that damage and the like are reduced as much as possible.

Further, if the protective plate 7 is provided as shown in the figure, it is possible to prevent the excavator and the above-mentioned debris from hitting the waterproof sheet 4 and the cushioning material 3, and it is possible to more reliably prevent the waterproof sheet 4 from being damaged. This can be prevented. The protection plate 7 may be removed after excavating the tunnel portion T2 in some cases.

Next, primary lining is applied to the inner surface of the ground or the inner surface of the tunnel portion T2 excavated after the above, and the inner surface of the primary sheet is covered with the waterproof sheet as shown in FIGS. 10 (a) and 10 (b). 4 and the exposed portions of the protection plate 7, the cushioning material 3 and the water barrier 62 are attached, and fixed with the anchor nails 15 or the like as necessary.

Next, after covering the inner surface of the ground or the inner surface of the primary lining with the cushioning material 3 as necessary, a waterproof sheet 4 is laid on the entire inner surface, and the secondary lining 5 is cast inside the waterproof sheet 4. Thus, a triple tunnel as shown in FIGS. 1 and 2 is formed.

In the case where a gap or the like is formed between the adjacent ribs 6b of the water barriers 61 to 63 during or after the tunnel construction, the exhaust hose 8 is disposed as described above. By doing so, the filling material such as resin can be filled in the space via the hose 8.

If a gap or the like is formed between the waterproof sheet 4 at the top end of each of the tunnel portions T1 and T2 and the secondary lining 5, the above-described filling material filling hole 9 is formed. By doing so, the void can be filled with an injecting material such as cement milk or low-fluidity mortar through the filling hole 9, and the waterproof sheet 4 can be brought into close contact with the ground.

In the above embodiment, an example in which the present invention is applied to a triple tunnel is shown. However, the present invention can be applied to a tunnel by the above-mentioned silo method, a double tunnel, and other multiple tunnels.

[0047]

As described above, the waterproof structure for a tunnel according to the present invention and the method for constructing the same are provided with a water barrier on the inner surface of the waterproof sheet 4 corresponding to the boundaries Ka and Kb of the adjacent tunnel portions T1 and T2. By providing the waterproof sheet 62, the waterproof sheet 4 can be reinforced in combination with the fact that the waterproof area can be partitioned and the leak can be prevented from spreading over a wide range in the event of a water leak.

In particular, adjacent tunnel portions T1 and T2 in the upper arch portion of the multiple tunnel where spring water easily accumulates.
Since the water barrier is provided at a position corresponding to the boundary portions Ka and Kb, the water barrier can be divided into each region not including the recessed portion between the arches. It is possible to reliably detect and repair the location of the occurrence of water leakage early without being spread.

As described above, the water barrier is provided on the inner surface of the waterproof sheet corresponding to the boundary where the spring water in the multiple tunnel is likely to accumulate and the water pressure is likely to be applied, so that the sheet thickness is usually about 2 to 3 mm. A certain waterproof sheet 4 is reinforced by the base material 6a (usually about 4 mm in thickness) of the water barrier, so that breakage of the sheet (that is, occurrence of water leakage) can be prevented.

Furthermore, by providing a protective plate 7 on the outer surface (ground side) of the waterproof sheet corresponding to the above boundary during or after tunnel excavation, the excavator or excavated rock fragments may hit the waterproof sheet. This makes it possible to more reliably prevent breakage of the above-described boundary portion and the waterproof sheet in the vicinity thereof where the above-mentioned spring water is most likely to accumulate and water leakage is likely to occur.

The ribs 6 of the water barriers 61 to 63
If the exhaust injection hose 8 is provided between the b and 6b, the air between the ribs of the water barrier is discharged when the secondary lining 5 is cast, so that the concrete can be satisfactorily filled. Therefore, it is possible to avoid the possibility that an air pool is formed between the ribs to form a water passage, that is, a passage for water leakage, so that the function as a water barrier can be surely exhibited.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing one embodiment of a waterproof structure for a tunnel according to the present invention. (B) is a development inner view of a substantially upper half of the waterproof sheet laid on the inner peripheral surface of the tunnel. (C)
FIG. 4 is a developed inner view of a substantially lower half of the waterproof sheet.

FIG. 2 (a) is an enlarged view of a dashed line portion A in FIG. 1 (a). FIG. 2B is an enlarged view of a chain line portion B in FIG.

FIG. 3 is an explanatory diagram showing an arrangement configuration of a water barrier and an exhaust injection hose.

FIG. 4 is a longitudinal sectional view of a part of a tunnel showing an arrangement of the barrier and the hose.

FIG. 5 is an explanatory diagram showing an example of a configuration of an exhaust injection hose.

FIG. 6 is a longitudinal sectional view showing a configuration of an injection material filling hole provided at the top end of the tunnel.

FIG. 7A is an explanatory view showing a procedure for laying a waterproof sheet at the top of a tunnel. (B) is explanatory drawing which shows the installation procedure of the waterproof sheet in the lower part of a tunnel.

FIG. 8 (a) is an explanatory view showing a procedure for laying a waterproof sheet at the top of a tunnel. (B) is explanatory drawing which shows the installation procedure of the waterproof sheet in the lower part of a tunnel.

FIG. 9A is an explanatory view showing a procedure for laying a waterproof sheet at the top of a tunnel. (B) is explanatory drawing which shows the installation procedure of the waterproof sheet in the lower part of a tunnel.

FIG. 10A is an explanatory view showing a procedure for laying a waterproof sheet at the top of a tunnel. (B) is explanatory drawing which shows the installation procedure of the waterproof sheet in the lower part of a tunnel.

FIG. 11 is an explanatory view showing a conventional waterproof sheet construction example for a tunnel by a silott method.

FIG. 12 is an explanatory view showing a conventional waterproof sheet construction example in a triple tunnel.

13A and 13B are explanatory views showing a conventional waterproof sheet construction procedure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ground 2 Primary lining concrete 3 Buffer material 4 Waterproof sheet 5 Secondary lining concrete 61-63 Water barrier 6a Base material 6b Rib 7 Protective plate 8 Exhaust injection hose 9 Injection filling hole 91 Contact grout pipe 92 Core material 10 Fixed Tool 11 Disc washer 12 Bolt T1, T2 Tunnel Ka, Kb Boundary J1, J2 Joint

Claims (6)

[Claims] 1. A tunnel waterproofing structure in which a waterproof sheet is continuously laid in a multiple tunnel composed of a plurality of tunnels excavated in a plurality of times, wherein a plurality of tunnels are excavated at a boundary between the plurality of adjacent tunnels. Tunnel waterproof structure characterized by providing a water barrier on the inner surface of the corresponding waterproof sheet. 2. The tunnel waterproof structure according to claim 1, wherein a protective plate is provided on an outer surface of the waterproof sheet corresponding to a boundary between the plurality of adjacent tunnel portions. 3. The exhaust system according to claim 1, wherein the water barrier comprises a sheet-shaped base material and a plurality of ribs integrally provided on the base material. 3. The waterproof structure for a tunnel according to claim 1, further comprising a hose. 4. A method for constructing a tunnel waterproof structure in which a waterproof sheet is continuously laid in a multiple tunnel composed of a plurality of tunnel portions excavated in a plurality of times, the method comprising: A waterproof sheet is laid on the inner surface of the ground or on the inner surface of the primary lining concrete cast on the inner surface of the ground, and a water barrier is fixed to the inner surface of the waterproof sheet corresponding to the boundary between the plurality of adjacent tunnel portions, Tunnel waterproofing structure characterized by placing secondary lining concrete on the inner surface side of the waterproof sheet with the end of the waterproof sheet and a part of the water barrier exposed, and then excavating an adjacent tunnel portion. Construction method. 5. A state in which a protective plate is arranged on an outer surface of the waterproof sheet corresponding to a boundary between the plurality of adjacent tunnel portions, and the protective plate covers an end of the waterproof sheet and a part of the water barrier. 5. The method according to claim 4, wherein the adjacent tunnel portion is excavated. 6. The exhaust system according to claim 1, wherein the water barrier comprises a sheet-like base material and a plurality of ribs integrally provided on the base material, and has a large number of holes on a peripheral surface between adjacent ribs. 6. The method according to claim 4, wherein a hose is provided and air between the adjacent ribs is exhausted through the exhaust injection hose when the secondary lining concrete is poured. .