JP4117426B2 - Water stop structure of tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is for stopping spring water entering between the primary lining concrete and the secondary lining concrete from flowing out from one side of the tunnel length direction to the other side at a predetermined location such as a construction zone boundary. Related to the still water structure of the tunnel.
[0002]
[Prior art and problems to be solved by the invention]
In the case of tunnels that penetrate mountains, the water tight construction method is adopted in which the entire periphery of the tunnel is covered with a cylindrical sheet (waterproof sheet). In such a construction method, the water in the tunnel section flows outside the tunnel section. In addition, there is a demand for means for stopping the water at the tunnel pit in order to prevent the reverse flow of water.
[0003]
The present invention has been made in view of such circumstances, and the spring water that has entered between the primary lining concrete and the secondary lining concrete at a predetermined location such as a tunnel boundary of the tunnel from one side in the length direction of the tunnel. It aims at providing the water stop structure which prevents flowing out to the other side.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is formed along the circumferential direction of the tunnel between the primary lining concrete and the secondary lining concrete at a predetermined location in the tunnel length direction, such as a tunnel boundary. A water stop structure that prevents the flow of spring water, etc., entering between the concrete and secondary lining concrete from flowing out from one side in the length direction of the tunnel to the other side. A tubular sheet formed in a tubular shape between the engineered concrete and the secondary lining concrete is fixed to the primary lining concrete surface so as to form a sealed filling chamber along the circumferential direction of the tunnel inside, and the above An injection pipe having a discharge hole for discharging the injection agent in the filling chamber and a permeation layer disposed so as to cover the periphery of the injection pipe are provided, and the internal communication space in the permeation layer is filled with the above-described injection space. In in the filled state to become filled with the infusate into the filling chamber to provide a water stop structure of the tunnel characterized by.
[0005]
Here, it is more preferable to flatten the primary lining concrete surface with an embedding agent, and between the cylindrical sheet and the primary lining concrete and between the cylindrical sheet and the secondary lining concrete. It is more preferable that a water absorbing member made of a water-swellable substance is attached to at least one. An auxiliary water-stopping member made of a water-swellable substance is disposed in the vicinity of the primary lining concrete surface of the predetermined location along the circumferential direction of the tunnel, and the contact surface of the auxiliary water-stopping member with the secondary lining concrete It is more effective to cover with a water shielding sheet.
[0006]
That is, the water stop structure of the tunnel according to the present invention is formed along the circumferential direction of the tunnel between the primary lining concrete and the secondary lining concrete at a predetermined location in the tunnel length direction such as the tunnel construction zone boundary. A cylindrical filling sheet is formed between the primary lining concrete and the secondary lining concrete at a predetermined location where water is to be shut off in the tunnel. In addition to fixing to the primary lining concrete surface, an injection pipe provided with a discharge hole for discharging the injection agent in the filling chamber and a permeation layer arranged to cover the periphery of the injection pipe were provided Therefore, the secondary lining concrete did not enter the filling chamber, and the filling agent was filled in the filling chamber in a state where the internal communication space in the permeation layer was filled with the filling agent. , Tubular sheet is pressed against the secondary lining concrete by filled infusate. And since the filling agent filled in this state is hardened, the water passage between the primary lining concrete and the secondary lining concrete is blocked in the tunnel length direction at the predetermined location. Can be stopped from flowing from one side of the tunnel length direction to the other side.
[0007]
Here, when the primary lining concrete surface is flattened with an embedding agent, the fixing work of the cylindrical sheet is facilitated and the adhesion between the primary lining concrete surface and the cylindrical sheet is also improved. Aqueous solution becomes more excellent. Further, when a water absorbing member made of a water-swellable material is attached between at least one of the cylindrical sheet and the primary lining concrete and between the cylindrical sheet and the secondary lining concrete, the cylindrical sheet and Even if a gap is formed between the primary lining concrete and the secondary lining concrete, and the flowing water may not be completely blocked, the water-swellable substance of the water absorbing member absorbs the water and swells. Since the gap is filled, water stoppage at a predetermined location of the tunnel is more reliable. Then, an auxiliary water-stopping member made of a water-swellable substance is disposed along the circumferential direction of the tunnel in the vicinity of the primary lining concrete surface of the predetermined location, and the contact surface of the auxiliary water-stopping member with the secondary lining concrete If the water-blocking sheet is covered, even if water leakage or the like enters the primary lining concrete and a water passage is formed, the water-swellable substance of the auxiliary water-stopping member absorbs the incoming water and swells. Since the water passage is blocked by this, water can be stopped more reliably.
[0008]
Therefore, by forming the water stop structure of the tunnel of the present invention at a predetermined location in the tunnel length direction such as the tunnel boundary of the tunnel, spring water or the like entering between the primary lining concrete and the secondary lining concrete can be obtained. It is possible to reliably stop the flow from one side in the length direction of the tunnel to the other side at the predetermined location.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to the drawings.
[0010]
FIG. 1 and FIG. 2 explain an example of the structure of a water stop structure for a tunnel according to the present invention. FIG. 1 shows the water stop structure formed between a primary lining concrete and a secondary lining concrete. FIG. 2 is a schematic cross-sectional view of a tunnel schematically showing the inside of the tunnel for explaining the water stop structure 1. This water stop structure 1 is made of mortar or the like along the tunnel circumferential direction on the surface of the primary lining concrete 2 in the vicinity of the tunnel side from the wellhead B of the tunnel A (see FIG. 2) waterproofed by the waterproof sheet a. After flattening with the embedding agent 2a, the cylindrical sheet 3 is formed in a cylindrical shape so that a sealed filling chamber 5 is formed between the primary lining concrete 2 and the secondary lining concrete 4. 3 projecting pieces (free ends for fixing the cylindrical sheet) 3a and 3a are fixed to the primary lining concrete 2 along the circumferential direction of the tunnel, and the injection 6 is discharged into the filling chamber 5. Inlet pipes 7 and 7 each having a plurality of discharge holes 7a, and a permeation layer 8 disposed so as to cover the periphery of each of the injection pipes 7 and 7 are provided, and an internal communication space in the permeation layer 8 is provided. Filled with injection 6 and As shown, the filling agent 5 is poured into the filling chamber 5 from the filling pipes 7 and 7 and the filling chamber 5 is filled with the filling agent 6, and the cylindrical sheet 3 and the secondary lining are further filled. Between the concrete 4 and between the tubular sheet 3 and the embedding agent 2a, water absorbing members 9, 9 made of a water swellable material such as a water swellable rubber are disposed.
[0011]
Here, the material of the cylindrical sheet 3 is not particularly limited. For example, a thermoplastic resin water-impermeable sheet such as vinyl chloride, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer (EVA) is used. Can be mentioned. Further, the shape and size of the cylindrical sheet 3 are not particularly limited. For example, as shown in FIG. 1, the tubular sheet 3 includes an infiltration layer 8 that surrounds the injection pipes 7 and 7 by two impermeable sheets. A filling chamber 5 that can be provided in the room is formed, and both end portions of both sheets are in a free state, and the protruding pieces 3a and 3a for fixing the cylindrical sheet to the primary lining concrete 2 and the waterproofing Adhering a little inside of both end portions of both sheets linearly along the length direction by appropriate means such as bonding or heat welding so as to form the protruding pieces 3b, 3b for joining with the sheet a etc. What was formed in the cylinder shape is suitable.
[0012]
The cylindrical sheet 3 is not limited to the above-described configuration. For example, a single sheet is formed in a cylindrical shape, and projecting pieces 3a, 3a, 3b, 3b are bonded to the outer peripheral surface along the length direction. Alternatively, it may be fixed by appropriate means such as heat welding. Further, the sheet thickness of the tubular sheet 3 is not particularly limited and has a strength that does not cause damage when the secondary lining concrete is placed, and the secondary lining concrete 4 is dried and contracted as described later. Thus, when the gap is generated, the thickness may be a certain degree of extensibility so as to be in close contact with the secondary lining concrete 4 due to the injection pressure of the injecting agent 6. About 2.0 mm is suitable.
[0013]
The embedding agent 2a for flattening the surface of the primary lining concrete 2 to which the tubular sheet 3 is fixed is shown with a certain thickness on the surface of the primary lining concrete 2 in FIG. In the case of the present invention, the embedding agent 2a only needs to be applied along the circumferential direction of the tunnel to such an extent that the concave portion of the primary lining concrete 2 surface can be embedded and the surface can be planarized. Further, the size of the filling chamber 5 is not particularly limited, but it is desirable that the filling chamber 5 has a certain width in the length direction of the tunnel in consideration of the water stopping efficiency. About 50 cm is preferable.
[0014]
The type of the injecting agent 6 is not particularly limited, but if the function of the water blocking structure 1 is taken into consideration, the injecting agent 6 can be easily injected into the injection pipe 7 at the time of injection, and can enter a small gap. In addition, it is necessary to cure in a relatively short time and not to shrink after curing, and examples thereof include an epoxy resin, a two-component type or a one-component type urethane resin, a cement slurry, and an ultrafine cement.
The injection pipe 7 has a pressure resistance sufficient to withstand the casting pressure of the secondary lining concrete and the injection pressure when the injection agent is injected, and is arranged along the circumferential direction on the primary lining concrete surface of the tunnel. Any flexible resin hose may be used, and for example, synthetic resin hoses such as polyvinyl chloride, nylon, and polypropylene are suitable. In these cases, the wall thickness should be 0.5 to 3 mm. Is preferable, and the inner diameter of the hose is preferably 5 to 30 mm. If the inner diameter of the hose is too small, it may be difficult to inject the infusate, and if it is too large, the pressure may not be sufficiently transmitted to every corner when the infusate is pumped, resulting in uneven injection.
[0015]
In the case of this configuration example, as shown in FIG. 2, each injection pipe 7 is attached in a ring shape along the circumferential direction of the tunnel on the surface of the primary lining concrete 2, and injects the injection agent after placing the secondary lining concrete. Injecting portions 7b, 7b for discharging and an air venting portion 7c for discharging the air in the pipe when injecting the injecting agent are connected to each other. The injecting pipe of the present invention is attached along the circumferential direction of the tunnel. As long as it is not necessary to be formed by one pipe, for example, one injection pipe is provided on each of the right and left sides of the upper half of the tunnel, and the lower ends of the injection pipes are connected to the injection parts 7b, 7b, The top end and the rear end of the pipe are electrically connected to the secondary lining concrete so that the upper end functions in the same manner as the air vent 7c. Similarly tip one injection pipes also the lower half portion, the rear end may be respectively attached so as to protrude out of the secondary lining concrete. In any case, the injection parts 7b and 7b and the air vent part 7c, or the secondary lining concrete conducting part of each injection pipe must be attached so as not to impair the sealing property of the filling chamber 5.
[0016]
The discharge hole 7a opened in the injection pipe 7 is not particularly limited in size, number of openings, and the like, but considering the ease of injection of the injection agent, the hole diameter is 2 to 7 mm. Preferably, the injection pipe 7 is formed every 10 to 300 cm in length. In this case, the opening position of the discharge hole 7a in the circumferential direction of the peripheral surface of the injection pipe 7 is not particularly limited. And can be selected as appropriate depending on the relationship between the diameter of the discharge hole 7a and the diameter of the discharge hole 7a. In the case of this configuration example, two injection pipes 7 and 7 are provided in the filling chamber 5, but the number of injection pipes provided in the filling chamber 5 is not particularly limited, One or three or more may be used, but 2 to 4 is preferable in consideration of completely filling the filling chamber with the filler and completely expelling the internal air.
[0017]
The material of the osmotic layer 8 is not particularly limited as long as it has an internal communication space so that the infusate can permeate. For example, the nonwoven fabric made of synthetic resin such as polyethylene, polypropylene, polyester, etc. A network having a three-dimensional structure is preferably used. The permeation layer 8 does not need to cover the entire outer peripheral surface of the injection pipe 7, but it is desirable to cover the entire surface in view of stabilizing the position of the injection pipe and securing the flow path of the injection agent.
[0018]
The water absorbing member 9 is appropriately arranged depending on the degree of running water, the completeness of water stoppage, and the like. Examples of the water swellable material forming the water absorbing member 9 include water swellable rubber and bentonite. Can be mentioned. The water absorbing member 9 may be disposed over the entire length of the tubular sheet 3 or may be divided at appropriate locations.
[0019]
Next, a method for stopping the water by forming the water stop structure 1 at the well opening B of the tunnel A (see FIG. 2) where the waterproof sheet a is stretched will be described.
[0020]
First, in the state where the permeation layer 8 covering the outer peripheral surface of the injection pipes 7 and 7 is housed in the interior of the filling chamber 5 made of the cylindrical sheet 3 along the circumferential direction on the surface of the primary lining concrete 2, The protruding pieces 3a and 3a are attached to the two primary lining concrete surfaces with concrete nails or anchor bolts along the circumferential direction, and the fixing interval at this time is preferably 15 to 50 mm.
[0021]
Further, the protruding piece 3b of the tubular sheet 3 can be integrated with the waterproof sheet a by liquid-tightly connecting to the end of the waterproof sheet a.
[0022]
In addition, when attaching the said water absorbing member 9, the attachment method in particular is not restrict | limited, You may adhere | attach by the adhesive agent etc. in the appropriate position of the cylindrical sheet | seat 3, or you may attach beforehand, and the water absorbing member 9 may be attached. After attaching to the primary lining concrete 2, the tubular sheet 3 may be fixed to the primary lining concrete 2 and further bonded or thermally welded to attach the water absorbing member 9 to the surface of the cylindrical sheet.
[0023]
The filling agent 5 is filled in the filling chamber 5 in a state where the internal communication space in the osmotic layer 8 is filled with the filling agent 6, and this filling operation is performed so as to bury the filling chamber 5. After placing the concrete 4 on the primary lining concrete 2 and hardening it, the injection 6 is injected into the injection pipes 7 and 7 from the injection parts 7b and 7b, and the air in the pipe from the air vent 7c. The injection agent 6 is discharged from the discharge holes 7a of the injection pipes 7 and 7 while permeating the injection pipe 7 and 7 to penetrate the permeation layer 8. The injection pipes 7 and 7 are filled with the injection agent 6 and the inside of the permeation layer 8 further. When the communication space is filled with the infusate 6, the gap in the filling chamber 5 is also filled with the infusate 6, and the injecting agent starts to be discharged from the air vent 7c, the injection is completed, and the injecting part 7b 7b and the exit side of the air vent 7c Closed by means such as filling the barrel, it is preferable that curing the infusate 6 filled. Note that this injection operation needs to be completed before the injection agent 6 is filled in the filling chamber 5 formed inside the cylindrical sheet 3 and closed in a liquid-tight manner without gaps and the injection agent 6 is cured. It is.
[0024]
When the waterstop structure 1 is formed by such a method, the cylindrical sheet 3 is interposed on the contact surface between the filling chamber 5 and the secondary lining concrete. Is prevented from entering the filling chamber 5 and is injected even when the secondary lining concrete hardens and shrinks by drying and a gap is generated between the tubular sheet 3 and the secondary lining concrete 4. The tubular sheet 3 is stretched by the injection pressure of the agent 6 and is in close contact with the primary lining concrete 2 and the secondary lining concrete 4.
[0025]
As described above, the waterproof structure 1 is formed along the circumferential direction of the tunnel between the primary lining concrete 2 and the secondary lining concrete 4 in the vicinity of the tunnel side of the pit B of the tunnel A. The tunnel in the tunnel length direction, such as spring water, formed between the primary lining concrete 2 and the secondary lining concrete 4 of the tunnel that has been conducted can be blocked before the wellhead B, and further tubular Even if water enters between the sheet 3 and the primary lining concrete 2 and the secondary lining concrete 4, the incoming water is absorbed by the water absorbing member 9, so the spring water from the natural ground of the tunnel is the wellhead In B, it can prevent reliably flowing water.
[0026]
As shown in FIG. 3, an auxiliary water stop member 11 made of a water swellable material such as bentonite or water swellable rubber is provided on the surface of the primary lining concrete 2 between the water stop structure 1 and the wellhead B. A cylindrical shape that is fixed with a concrete nail or the like along the direction, covers the contact surface of the auxiliary waterproofing member 11 with the secondary lining concrete 4 with a water shielding sheet 12, and forms the filling chamber 5 of the waterproofing structure 1. If the projecting piece 3b on the wellhead part B side of the sheet 3 and the side end part 12a of the water shielding sheet 12 adjacent thereto are liquid-tightly fixed by thermal bonding or the like, water leakage or the like enters the primary lining concrete side temporarily. Even if the water passage is formed, the water swellable substance of the auxiliary water blocking member 11 absorbs the incoming water and swells to block the water passage, so that the water can be stopped more reliably. In this case, instead of the cylindrical sheet 3 and the water-impervious sheet 12, the one in which the protruding length of the protruding piece 3 b of the cylindrical sheet 3 is increased and the filling chamber 5 is placed inside the sheet. It is preferable that the auxiliary water stop member 11 is covered with the protruding piece 3b.
[0027]
Further, the water stop structure 1 is formed at two locations on the tunnel side of the wellhead part B, slightly spaced apart in the tunnel length direction, and the auxiliary water stop member 11 covered with a water shielding sheet 12 or the like is provided between them. If placed, water can be completely stopped.
[0028]
In addition, the water stop structure of the tunnel of this invention is not limited to the said structure, You may change variously in the range which does not deviate from the summary of this invention.
[0029]
【The invention's effect】
According to the water stop structure of the tunnel of the present invention, flowing water such as spring water flows between the primary lining concrete of the tunnel and the secondary lining concrete at a predetermined location in the tunnel length direction such as the boundary of the construction zone. Outflow from one side to the other can be easily and reliably prevented. Therefore, the waterproof structure of the tunnel of the present invention is, for example, that the spring water in the tunnel section flows between the primary lining concrete and the secondary lining concrete and flows out of the tunnel section with the waterproof construction of the tunnel. Moreover, it is particularly useful for preventing water outside the tunnel section from flowing into the tunnel section at the tunnel wellhead.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a water stop structure for explaining a structural example of the water stop structure of the present invention.
FIG. 2 is a schematic sectional view of a tunnel for explaining the water stop structure.
FIG. 3 is a cross-sectional view of a water stop structure for explaining another configuration example of the water stop structure of the present invention.
[Explanation of symbols]
A Tunnel B Wellhead part (prescribed location)
DESCRIPTION OF SYMBOLS 1 Water stop structure 2 Primary lining concrete 3 Cylindrical sheet 4 Secondary lining concrete 5 Filling chamber 6 Injection agent 7 Injection pipe 7a Discharge hole 8 Penetration layer 9 Water absorption member 11 Auxiliary water stop member 12 Water shielding sheet

Claims (4)

It is formed along the tunnel circumferential direction between the primary lining concrete and the secondary lining concrete at a predetermined location in the tunnel length direction, such as the boundary of the tunnel construction zone, and between the primary lining concrete and the secondary lining concrete. Is a water stop structure that prevents the flowing water such as spring water from flowing out from one side of the tunnel length direction to the other side, between the primary lining concrete and the secondary lining concrete in the predetermined location. A cylindrical sheet formed in a cylindrical shape is fixed to the primary lining concrete surface so as to form a sealed filling chamber along the circumferential direction of the tunnel, and a discharge hole for discharging the injection agent into the filling chamber is provided. An injection pipe that has been established and a permeation layer disposed so as to cover the periphery of the injection pipe are provided, and the internal communication space in the permeation layer is filled with the injection agent, and the above-mentioned injection chamber is filled Water stop structure of the tunnel, characterized by comprising filling the material.   The water stop structure according to claim 1, wherein the primary lining concrete surface is flattened with an embedding agent.   The water stoppage according to claim 1 or 2, wherein a water absorbing member made of a water-swellable substance is attached between at least one of the cylindrical sheet and the primary lining concrete and between the cylindrical sheet and the secondary lining concrete. Construction.   An auxiliary water-stopping member made of a water-swellable material is disposed in the vicinity of the primary lining concrete surface at the predetermined location along the circumferential direction of the tunnel, and the contact surface of the auxiliary water-stopping member with the secondary lining concrete is blocked. The water stop structure according to claim 1, 2 or 3 covered with a water sheet.

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