JP2013044111A - Water cutoff structure and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water cutoff structure between a tunnel lining constructed by a non-open-cut method and an underground skeleton constructed by a different method.SOLUTION: A tunnel lining 20 is constructed by a non-open-cut method. The tunnel lining 20 and an underground skeleton constructed by a different process are combined into an underground structure, which has a water cutoff structure between the tunnel lining 20 and the underground skeleton. The water cutoff structure includes a water cutoff member 31 placed between neighboring rings (tunnel box bodies 22 and 22) in the tunnel longitudinal direction. An exposed part 33 formed of an end part of the water cutoff member 31 is exposed from the surface of the tunnel lining 20. A waterproof sheet 35 for covering the underground skeleton has a pendent part 35a at an end, which comes in surface contact with the surface of the tunnel lining 20 and the exposed part of the water cutoff member 31.

Description

  The present invention relates to a water-stop structure for underground structures and a construction method thereof.

  After constructing multiple small-section tunnels, remove the unnecessary lining of each tunnel to form a large space, and use the remaining lining of each tunnel to install the top plate and side walls of the main building. A technique for constructing a large section tunnel by forming is known.

  As a seal structure between two adjacent tunnels, a structure in which an elastic seal member is provided along the propulsion direction on the outer surface of the following tunnel facing the preceding tunnel is known (for example, Patent Document 1). reference). The elastic seal member includes a base portion fixed to the outer surface of the succeeding tunnel, and a lip portion formed integrally with the base portion and having a tip facing the outside of the large section tunnel. The lip portion is urged toward the outer surface of the preceding tunnel by the pressure outside the large section tunnel.

JP 2010-133100 A

  By the way, after constructing the tunnel lining by the non-cut-off method, the underground structure is constructed next to the tunnel lining by, for example, the open-cut method, and the underground structure is constructed by connecting the tunnel lining and the underground structure. New construction methods have been developed. In such a construction method, a water stop structure for stopping water between the tunnel lining provided with the segment and the underground frame is required, but it cannot be installed with the elastic seal member as described above.

  From such a point of view, the present invention has an object to provide a water stop structure for stopping water between a tunnel lining constructed by a non-open-cut method and an underground skeleton constructed in a separate process, and a construction method thereof. And

  The invention according to claim 1 for solving such a problem is an underground structure formed by combining a tunnel lining constructed by a non-cutting method and an underground skeleton constructed in a separate process. A water stop structure between the tunnel lining and the underground skeleton in an object, sandwiching a water stop member between adjacent rings in the longitudinal direction of the tunnel, and connecting one end of the water stop member to the tunnel cover The waterproof structure is characterized in that the end portion of the waterproof sheet that is exposed from the surface and covers the underground structure is brought into surface contact with the surface of the tunnel lining and the exposed portion of the waterproof member.

  The “ring” in the present invention refers to a segment ring (assembled by forming a plurality of segment pieces or a cylindrical box) constructed mainly by a shield method and a propulsion method. Further, the ring is not limited to a circular cross section, and includes a ring having a deformed cross section such as a rectangle.

  According to the above configuration, since the water-stopping member is exposed at the surface of the joint portion between the rings where the water is likely to be generated and brought into surface contact with the waterproof sheet, it can be sealed at the “surface” and the sealing performance is improved. Can be made.

  The invention according to claim 2 is characterized in that the water stop member includes a sandwiching portion disposed between the rings, and an exposed portion that is bent from the sandwiching portion and disposed along the surface. And According to such a structure, since the area which an exposed part and a waterproof sheet contact becomes large, sealing performance can be improved further.

  According to a third aspect of the present invention, the ring has a steel skin plate, the skin plate of the portion where the exposed portion is located is cut out, and the surface of the exposed portion and the skin plate It is characterized in that the surface of is flush. The exposed portion only needs to be flush with the surface of the skin plate in a state where the exposed portion is covered with the waterproof sheet 35. According to such a configuration, there is no step between the skin plate and the exposed portion, so that the contact with the waterproof sheet is enhanced.

  According to a fourth aspect of the present invention, there is provided a pressing plate that presses the waterproof sheet against the surface of the tunnel lining and the water stop member from the underground frame side. According to such a structure, since the adhesiveness of the waterproof sheet with respect to the surface of a tunnel lining and a water stop member becomes high, sealing performance improves further.

  The invention according to claim 5 is a method for constructing a water stop structure formed between the tunnel lining and the underground skeleton when the underground skeleton is constructed next to the tunnel lining constructed by the non-open cutting method. A water stop member is disposed between rings adjacent to each other in the tunnel longitudinal direction when the tunnel lining is constructed, and one end of the water stop member is exposed on the surface of the tunnel lining; A curing step of installing a cover covering the exposed portion of the water blocking member, a cover removing step of removing the cover when the underground structure is constructed, and a waterproof sheet covering the underground structure, the end of the tunnel being the tunnel A waterproof sheet construction method comprising: a waterproof sheet installation step of installing a surface of a lining and an exposed portion of the water stop member so as to be in surface contact with each other.

  According to such a method, since the water-stopping member is exposed at the surface of the joint portion between the rings where water easily occurs and is brought into surface contact with the waterproof sheet, it can be sealed at the “surface”, and the sealing performance Can be improved. Furthermore, the water-stopping member can be protected when the tunnel lining is constructed by installing the cover in the curing process.

  According to the water stop structure and the water stop method according to the present invention, it is possible to stop water between the tunnel lining constructed by the non-cutting method and the underground frame constructed by the cut method.

It is sectional drawing which showed the completed state of the water stop structure which concerns on embodiment of this invention. It is the disassembled perspective view which showed the water stop structure which concerns on embodiment of this invention. It is the disassembled perspective view which showed the state at the time of the propulsion of the tunnel box of the still water structure which concerns on embodiment of this invention. It is the figure which showed the attachment state to the ring of a waterproof sheet, Comprising: (a) is sectional drawing which showed 1st embodiment, (b) is sectional drawing which showed 2nd embodiment. It is sectional drawing which showed the state at the time of the propulsion of the tunnel box of a water stop member. After constructing the tunnel lining by the non-cut-off method, construct the underground structure next to the tunnel lining by the open-cut method and connect the tunnel lining and the underground structure to construct the underground structure It is 1st process explanatory drawing for demonstrating a method. It is 2nd process explanatory drawing following FIG. FIG. 8 is an explanatory diagram of a third process following FIG. 7. FIG. 9 is an explanatory diagram of a fourth step following FIG. 8. FIG. 10 is an explanatory diagram of the fifth process following FIG. 9. It is sectional drawing which showed the state at the time of the promotion of the tunnel box of the water stop member of the water stop structure which concerns on other embodiment of this invention.

  The water-stop structure according to the embodiment of the present invention is a tunnel lining and an underground skeleton in an underground structure formed by combining a tunnel lining constructed by a non-open-cut method and an underground skeleton constructed in a subsequent process. It is a water stop structure between the two. First, the outline of the construction method of the underground structure will be described with reference to the attached drawings. In the present embodiment, a case where a tunnel lining is constructed by a propulsion method as a non-cutting method will be described as an example. Moreover, in this embodiment, the underground frame is constructed by the open-cut method.

  As shown in FIG. 11, the underground structure 1 includes a ground 3 (hereinafter referred to as “cutting”) in which a part (tunnel lining 20) is located below the existing building 2 and the remaining part (underground frame 25) can be cut. It is located inside the ground 3 ”).

  When constructing the underground structure 1, as shown in FIG. 6, first, the earth retaining piles 4 are placed on both sides in the width (opening width) direction of the excavated ground 3 (earth retaining pile placing work). Then, the small cross-section tunnels 21 and 21 for constructing the tunnel lining 20 (hereinafter sometimes referred to as “main tunnel lining 20”) that becomes a part of the large-section tunnel 10 (see FIG. 10) are promoted. A plurality are formed by a construction method (see FIG. 6). Specifically, two small-section tunnels 21 and 21 are sequentially constructed from the bottom inside the peripheral ground 6 whose ground has been improved, and are arranged in parallel in the vertical direction. In addition, the construction method of the small cross-section tunnel 21 is not limited to the propulsion method, and other methods such as a shield method may be adopted.

  Thereafter, a part of the tunnel box 22 of the small cross-section tunnel 21 is used as a mold, and concrete is laid, and one side wall portion 11a and one top plate portion 12 of the large cross-section tunnel 10 (see FIG. 10) are placed. The part 12a and the part 13a of the bottom plate part 13 are formed (main tunnel lining construction work). At the same time, a slab receiving temporary column 14 is provided between the top plate portion 12 and the bottom plate portion 13. The slab receiving temporary column 14 supports a part 12 a of the top plate portion 12.

  Then, as shown in FIG. 7, after excavation ground 3 is excavated from above (excavation work), earth retaining support (raising and cutting beam) 15 is provided between earth retaining piles 4 and 4 (earth retaining work). The earth retaining supports 15 are arranged in four stages in the vertical direction, and are provided at a plurality of locations at predetermined intervals in the tunnel longitudinal direction.

  After that, as shown in FIG. 8, the leveled concrete 16 is placed on the excavated ground (leveled concrete placing work). Then, the earth retaining support 15 (see FIG. 7) located at the height of the inner space of the large section tunnel 10 is removed (the earth retaining work removal work) and interferes with the inner section of the main tunnel lining 20. The retaining pile 4 is cut and removed (cutting pile cutting and removal work). Further, the steel shell 22h (see FIG. 7) of the tunnel box 22 protruding from the side wall portion 11, the top plate portion 12, and the bottom plate portion 13 is cut and removed (steel shell cutting and removal work). Thereafter, a waterproof sheet 35 (see FIG. 2) which is a part of the water stop structure 30 (see FIGS. 1 to 4) according to the present embodiment is leveled and laid on the concrete 16. In addition, the structure and formation procedure of the water stop structure 30 will be described later.

  And as shown in FIG. 9, the underground frame 25 is constructed | assembled on the upper part of the leveling concrete 16 which laid the waterproof sheet 35 (refer FIG. 2) (frame building construction). At this time, the underground frame 25 is made of concrete in the order of a part 13b of the bottom slab part 13 of the large cross-section tunnel 10, a side wall part 11b on one side (opposite side to the tunnel lining 20 side), and a part 12b of the top part 12b. It is constructed by placing them sequentially. When a part 12b of the top plate part 12 is completed, a waterproof sheet (not shown) is laid from the top surface to the side surface of the part 12a of the top plate part 12, and this embodiment is similar to the bottom plate part 13. The water stop structure concerning is formed. The waterproof sheet is connected from the bottom plate portion 13 to the side wall portion 11b and the top plate portion 12, and a water stop line is secured.

  Thereafter, as shown in FIG. 10, the earth retaining support 15 (see FIG. 9) located above the underground structure 25 is removed (the earth retaining structure removal work), and the earth is refilled above the underground structure 25 (burial). Return work). Then, the backfilled ground surface is appropriately finished, and the construction work of the large-section tunnel 10 is completed.

  Next, the structure of the water stop structure 30 which concerns on embodiment of this invention is demonstrated. The still water structure 30 is in the underground structure 1 (see FIG. 10) formed by combining the tunnel lining 20 constructed by the non-cutting method and the underground frame 25 constructed in a later process than the tunnel lining. This is a water stop structure between the tunnel lining 20 and the underground skeleton 25. Hereinafter, the water stop structure in the bottom plate portion 13 will be described, but the water stop structure having the same configuration is also formed in the top plate portion 12. The top plate portion 12 is configured to be inverted upside down.

  As described above, the tunnel lining 20 constructed by the propulsion method is formed by connecting a plurality of rings (tunnel box 22) in the propulsion direction as shown in FIG. In addition, the “ring” in the present embodiment is a rectangular tubular tunnel box 22 used in the propulsion method. The ring finally has a shape in which a part (underground skeleton 25 side) is cut off and opened.

  As shown in FIGS. 1 and 2, the ring (tunnel box 22) has a frame-like frame 22a formed of a main girder and a steel skin plate 22b. The skin plate 22 b is fixed to the outer surface of the frame-shaped frame 22 a and covers the outer peripheral surface of the tunnel box 22. The skin plate 22 b constitutes the surface of the tunnel lining 20. A cutout portion 26 is formed at a position of the skin plate 22b where the water stop member 31 is provided.

  As shown in FIG. 1, a water-stop member 31 is disposed and sandwiched between rings adjacent to each other in the tunnel longitudinal direction (between the tunnel boxes 22 and 22), and one end of the water-stop member 31 is tunnel lining. 20 is exposed on the surface. A waterproof sheet 35 is placed on the lower surface (side surface) of the tunnel box 22. The waterproof sheet 35 is laid on the leveled concrete 16 (see FIG. 10), and covers the underground skeleton 25 (see FIG. 10) constructed in a later step from below. As shown in FIG. 2, the end of the waterproof sheet 35 on the tunnel box 22 side hangs down. In the following, the part of the waterproof sheet 35 that hangs down is referred to as “hanging part 35 a”, and the part of the waterproof sheet 35 on the leveled concrete 16 is referred to as “horizontal part 35 b”. The hanging portion 35 a of the waterproof sheet 35 is covered so as to cover the lower surface of the tunnel box 22, and is in surface contact with the surface of the tunnel box 22 and the exposed portion of the water blocking member 31. Note that the end portion of the smoothing concrete 16 on the tunnel lining 20 side is chamfered (see FIG. 4), and the fixing plate 36, which will be described later, is fixed in the chamfered space. .

  As shown in FIG. 1, the water stop member 31 is disposed along the surface of the tunnel lining 20 by bending from the sandwiching portion 32 disposed between the frame-shaped frames 22 a of the tunnel box 22 and the sandwiching portion 32. And an exposed portion 33. The sandwiching part 32 and the exposed part 33 are both made of a rectangular elastic resin (for example, polyethylene resin or epoxy resin) plate material. The sandwiching part 32 and the exposed part 33 are integrally formed to form the water stop member 31. Yes. The outer end portion of the sandwiching portion 32 is fixed to the central portion of the exposed portion 33, and the water stop member 31 has a T-shaped cross section. The exposed portion 33 extends from the outer end portion of the sandwiching portion 32 in the forward and backward directions.

  The sandwiching portion 32 enters the recess 23 formed in the frame-shaped frame 22a and is sandwiched between the frame-shaped frames 22a and 22a facing each other. The recess 23 is formed on the joint surface of the adjacent tunnel box 22 (surfaces of the frame-shaped frame 22a facing each other). The recess 23 has a height dimension equivalent to the height of the sandwiching portion 32 (the front and back direction in FIG. 1) and a depth dimension about half the thickness of the sandwiching portion 32 (depth in the propulsion direction). And the space which accommodates the clamping part 32 is formed because the two recessed parts 23 face each other. A seal groove 23 a extending in the vertical direction is formed on the bottom surface of the recess 23. An elastic seal 24 is accommodated in a compressed state in the seal groove 23a, and the elastic seal 24 presses the surface of the clamping portion 32 and the surface of the seal groove 23a to stop water between the inside and outside of the tunnel box 22. . This seal groove 23a is formed on the joint surface of the frame-like frame 22a in the portions where the recess 23 is not formed (upper and lower sides of the recess 23) (see FIG. 2).

  The exposed portion 33 extends before and after in the propulsion direction. The exposed portion 33 enters the cutout portion 26 of the skin plate 22b. Inside the cutout portion 26, a bracket 22d fixed to the frame-like frame 22a is disposed. The bracket 22d is a member that covers the notch 26 from the inside, and the inner peripheral edge of the notch 26 is welded and fixed. The exposed portion 33 is formed to have a thickness equivalent to that of the skin plate 22b, and the surface of the exposed portion 33 and the surface of the skin plate 22b are flush with each other. The exposed portion 33 only needs to be flush with the surface of the skin plate 22b in a state where the exposed portion 33 is covered with the waterproof sheet 35 and pressed and compressed. In some cases, it may protrude slightly from the surface of the plate 22b. A gap generated between the peripheral edge of the exposed portion 33 and the cutout portion 26 is filled with a sealing material 34. The sealing material 34 is filled when the waterproof sheet 35 is installed.

  As shown in FIG. 2, the hanging portion 35 a of the waterproof sheet 35 extends in the axial direction of the tunnel lining 20 within a height range covering the exposed portion 33 and is in surface contact. The waterproof sheet 35 is bonded to the surface of the tunnel lining 20 and the surface of the exposed portion 33 via an adhesive. A pressing plate 36 is provided on the hanging portion 35a on the underground skeleton 25 (see FIG. 10) side. The presser plate 36 presses the suspended portion 35 a of the waterproof sheet 35 against the surface of the tunnel lining 20 and the exposed portion 33 of the water stop member 31. The pressing plate 36 is disposed at a position that covers the surface of the exposed portion 33 and is fixed to the skin plate 22 b by bolts 37.

  As shown in FIG. 1, the bolt 37 passes through the through hole 36a of the pressing plate 36 and the through hole 35c of the waterproof sheet 35, and is screwed into the screw hole 22e and the cap nut 22f of the skin plate 22b (enlarged portion). reference). A water swelling washer (not shown) is attached around the through hole 35 c of the waterproof sheet 35. The bolt 37 is tightened in a space (see FIG. 4) formed by chamfering the leveled concrete 16. By tightening the bolts 37, the pressing plate 36 is pressed against the surface of the tunnel lining 20, and the waterproof sheet 35 is pressed against the surface of the tunnel lining 20 and the exposed portion 33 of the water stop member 31. Then, the waterproof sheet 35 is in close contact with the surface of the exposed portion 33 and the surface of the skin plate 22b (surface touch).

  After the pressing plate 36 is fixed, a backfill material 39 such as mortar is backfilled in the space formed by chamfering the leveled concrete 16 as shown in FIG. The backfill material 39 is backfilled to the same height as the upper end surface of the leveled concrete 16, and the horizontal portion 35b of the waterproof sheet 35 is disposed thereon. And the underground frame 25 is constructed | assembled on the horizontal part 35b of the waterproof sheet 35. As shown in FIG.

  In this embodiment, the pressing plate 36 is disposed at a height position that covers the exposed portion 33. However, the arrangement position is not limited to this, and as shown in FIG. You may arrange | position so that the waterproof sheet 35 may be pressed in the position below the water member 31. FIG. Even if it arrange | positions in this way, the adhesiveness of the waterproof sheet 35 and the surface of the skin plate 22b can be improved.

  In the present embodiment, the pressing plate 36 is provided to improve the adhesion between the waterproof sheet 35 and the surface of the tunnel lining 20 and the surface of the exposed portion 33, but is not limited thereto. For example, the waterproof sheet may be bonded to the surface of the tunnel lining and the surface of the exposed portion with an adhesive. If the back surface of the exposed portion 33 is bonded to the outer peripheral surface of the frame-shaped frame 22a and the surface of the skin plate 22b, the pressing plate can be omitted.

  Next, the construction method of the water stop structure 30 of the said structure is demonstrated. When constructing the tunnel lining 20 by the propulsion method (non-cutting method), as shown in FIG. 5, the sandwiching portion 32 of the water stop member 31 is sandwiched between the tunnel boxes 22 adjacent in the tunnel longitudinal direction, The exposed portion 33 is exposed from the surface of the tunnel box 22 (water stopping member installation step). At this time, in the exposed portion 33, the exposed portion 33 enters the cutout portion 26 formed in the skin plate 22b, and the surface of the exposed portion 33 and the surface of the skin plate 22b are flush with each other.

  And the cover 40 which covers the exposed part 33 which is the exposed part of the water stop member 31 is installed, and the exposed part 33 is protected and cured (curing process). The cover 40 is made of an iron plate and has a rectangular shape larger than the surface area of the exposed portion 33. The cover 40 is fixed to the skin plate 22b by flat bolts 41 arranged at the four corners. The countersunk bolts 41 are disposed outside the four corners of the exposed portion 33 and are formed in the bracket 22d through the taper holes 27a formed in the four corners of the cover 40 and the through holes 27b formed in the skin plate 22b. Screwed into the screw hole 27c. At this time, the head of the countersunk bolt 41 is flush with the surface of the cover 40, and the influence of the step when passing through the entrance is minimized. The taper hole 27a of the cover 40 has a long hole shape in the vertical direction and a long hole shape in the horizontal direction in consideration of the deviation between the front and rear tunnel boxes 22 and 22 due to meandering. Yes. Specifically, a pair of upper and lower tapered holes 27a at one end in the propulsion direction (left side in FIG. 3) is formed in a vertically long shape, and a pair of upper and lower tapered holes 27a at the other end in the propulsion direction (right side in FIG. 3) are formed in a horizontally long shape. Has been.

  In this state, each tunnel box 22 is propelled to construct a small section tunnel 21. At this time, since the water stop member 31 is covered with the cover 40, it is not exposed to the natural ground and does not contact or slide on the natural ground. Therefore, the surface of the exposed portion 33 is not damaged, and the flatness can be maintained.

  The cover 40 is not limited to the above-described configuration, and may have another configuration. For example, the exposed portion 33 may be covered with protective mortar, a strong tape may be attached to the surface of the exposed portion 33, or covered with a tin plate. According to such a structure, a screw hole becomes unnecessary and the structure around the water stop member 31 becomes simple.

  Thereafter, through the above-described steps, in the step of constructing the underground frame 25, after the leveled concrete 16 is installed, the cover 40 is removed from the tunnel lining 20 (cover removal step). This operation is performed in a space formed by chamfering the leveled concrete 16. When the cover 40 is removed, the exposed portion 33 that is flush with the surface of the skin plate 22b is exposed. At this time, the surface of the exposed portion is kept in a state of high flatness. Here, the sealing material 34 is filled in the gap between the inner peripheral edge of the cutout portion 26 of the skin plate 22 b and the outer peripheral edge of the exposed portion 33. The sealing material 34 is filled so as to be flush with the surface of the skin plate 22b and the surface of the exposed portion 33 (see FIG. 1).

  Thereafter, the waterproof sheet 35 is installed such that the hanging portion 35a is in surface contact with the surface of the tunnel lining 20 and the exposed portion 33 of the water stop member 31 (waterproof sheet installation step). Specifically, the hanging portion 35a of the waterproof sheet 35 is installed at a predetermined position of the tunnel lining 20 and adhered with an adhesive, and the pressing plate 36 is attached from the surface side. Here, by tightening the bolt 37, the pressing plate 36 is pressed against the tunnel lining 20, and the waterproof sheet 35 is pressed against the surface of the tunnel lining 20 and the exposed portion 33 of the water stop member 31. At this time, since the surface of the tunnel lining 20 and the surface of the exposed portion 33 of the water stop member 31 are flush with each other, no step is generated and the waterproof sheet 35 can be easily adhered. Although the surface of the skin plate 22b is slightly slidable during propulsion, a water stop is not generated unlike the joint between the tunnel boxes 22 and 22, thus ensuring water-stopping.

  Then, a backfill material 39 such as mortar is backfilled in the space formed by chamfering the leveled concrete 16. A horizontal portion 35b of the waterproof sheet 35 is disposed thereon. At the same time, the horizontal portion 35 b is laid to the leveled concrete 16. And the underground frame 25 is constructed | assembled on the horizontal part 35b of the waterproof sheet 35. FIG.

  According to the water stop structure 30 configured as described above, the water stop member 31 is exposed at the surface of the joint portion between the tunnel boxes 22 and 22 where water is likely to be generated, and is brought into surface contact with the waterproof sheet 35. Thus, a sealing surface can be secured between the water stop member 31 and the waterproof sheet 35. As a result, even if a water channel is generated at the joint, the sealing surface is positioned on the extension line of the water channel, and the water channel can be sealed by “surface”, thereby improving the sealing performance. Moreover, since the water stop member 31 has the plate-shaped exposed part 33, since a contact area with the waterproof sheet 35 becomes large and a sealing surface becomes wide, water stop is improved. Furthermore, by pressing the waterproof sheet 35 with the presser plate 36, the adhesiveness of the waterproof sheet 35 to the surface of the tunnel box 22 and the surface of the exposed portion 33 is increased, and the water stoppage is further improved.

  Moreover, in this embodiment, since the cover 40 which covers the exposed part 33 is installed at the time of propulsion of the tunnel box 22, the water stop member 31 can be protected, and the exposed part 33 slides on the ground. There is nothing. Accordingly, the surface of the exposed portion 33 is not damaged and the flatness thereof can be maintained, so that the adhesiveness with the waterproof sheet 35 is increased, and the water stoppage can be improved.

  According to the water stop structure 30 as described above, it is possible to stop water between the tunnel lining 20 constructed by the non-cutting method such as the propulsion method and the underground frame 25 constructed by the cut method in the subsequent process. it can. Thereby, it is possible to prevent the underground water or the like outside the large-section tunnel 10 from entering the inside.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, in the water stop structure 30 according to the embodiment, the water stop member 31 has a T-shaped cross section, but is not limited thereto. For example, it may be L-shaped in cross section. Even in such a shape, the waterproof sheet 35 can be in surface contact with the exposed portion 33, so that a sufficient water-stopping property can be obtained. In addition, when making a water stop member into a L-shaped cross section, it is suitable when constructing | assembling a tunnel by a shield construction method. As shown in FIG. 11, when the water stop member 31 ′ has an L-shaped cross section, the cover 40 ′ is a segment ring 22 ′ constructed in a later process among the adjacent segment rings 22 ′ and 22 ′. It is installed only on the right side in FIG. As a result, it is not necessary to push the cover 40 ′ outside the existing segment ring 22 ′ constructed in the previous step, so that construction is easy. Even with such a configuration, the surface of the water stop member 31 ′ can be protected from natural ground.

  Moreover, in the said embodiment, although the underground frame 25 is constructed | assembled by the open-cut method, it is not limited to this, If it is constructed | assembled in the process after the tunnel lining 20, it is a non-cut-off method It may be constructed by.

1 Underground structure 20 Tunnel lining 22 Tunnel box (ring)
25 underground structure 30 water stop structure 31 water stop member 32 clamping part 33 exposed part 35 waterproof sheet 40 cover

Claims (5)

In the underground structure formed by combining a tunnel lining constructed by a non-open-cut method and an underground skeleton constructed in a separate process, the water stop between the tunnel lining and the underground skeleton Structure,
While sandwiching a water stop member between adjacent rings in the tunnel longitudinal direction, one end of the water stop member is exposed from the surface of the tunnel lining,
A water stop structure, wherein an end portion of a waterproof sheet covering the underground skeleton is brought into surface contact with a surface of the tunnel lining and an exposed portion of the water stop member. The said water stop member is provided with the clamping part arrange | positioned between the said rings, and the exposed part arrange | positioned along the said surface bent from the said clamping part. Water stop structure. The ring has a steel skin plate;
The skin plate of the portion where the exposed portion is located is cut away,
The water stop structure according to claim 2, wherein a surface of the exposed portion and a surface of the skin plate are flush with each other. The water stop structure according to any one of claims 1 to 3, further comprising a pressing plate that presses the waterproof sheet against the surface of the tunnel lining and the water stop member from the underground skeleton side. . When constructing an underground frame next to a tunnel lining constructed by a non-open-cut method, a method for constructing a water stop structure formed between the tunnel lining and the underground framework,
A water-stopping member installation step for disposing a water-stopping member between adjacent rings in the tunnel longitudinal direction during construction of the tunnel lining, and exposing one end of the water-stopping member to the surface of the tunnel lining,
A curing step of installing a cover covering the exposed portion of the water stop member;
A cover removing step for removing the cover at the time of constructing the underground structure;
A waterproof sheet installation step of installing the waterproof sheet covering the underground enclosure so that an end portion thereof is in surface contact with the surface of the tunnel lining and the exposed portion of the water blocking member. Construction method of water stop structure.

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