JP2000087699A - Tunnel water cut-off structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent spring water, etc., from flowing from one side to the other by providing a cylindrical sheet with a pouring pipe and an infiltration layer arranged inside thereof between primary and secondary lining concrete at a section boundary, and filling a grouting agent. SOLUTION: In a water cut-off structure 1, a surface of a primary lining concrete 2 is flattened with an embedding agent 2a, and projecting pieces 3a, 3a of a cylindrical sheet 3 are fixed to the surface of the primary lining concrete 2 so as to form an enclosed filling chamber 5 between primary and secondary concrete 2, 4. Pouring pipes 7, 7 with a discharge hole 7a opened therein are provided in the filling chamber 5, and a grouting agent 6 is filled in an infiltration layer 8 arranged to cover their periphery. When absorbing members 9, 9 formed of water-swelling rubber are arranged between the cylindrical sheet and the secondary lining concrete, and the embedding agent 2a. Flowing water such as spring water can be easily and surely prevented from flowing out in the longitudinal direction of a tunnel between the primary and secondary lining concrete 2, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for controlling the flow of spring water or the like that has entered between a primary lining concrete and a secondary lining concrete of a tunnel from one side in the longitudinal direction of the tunnel to the other side. The present invention relates to a water stopping structure of a tunnel for stopping at a predetermined location such as.

[0002]

2. Description of the Related Art In the case of a tunnel penetrating a mountain or the like, a watertight method of covering the entire outer periphery of the tunnel with a tubular sheet (waterproof sheet) is employed. In this case, there is a need for a means for stopping water at the tunnel entrance to prevent water in the tunnel section from flowing outside the tunnel section and vice versa.

[0003] The present invention has been made in view of such circumstances, and the spring water or the like that has entered between the primary lining concrete and the secondary lining concrete at a predetermined location such as the boundary of the tunnel construction zone is used in the lengthwise direction of the tunnel. It is an object of the present invention to provide a water stopping structure for preventing the water from flowing from one side to the other side.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a method of forming a tunnel between a primary lining concrete and a secondary lining concrete at a predetermined location in a tunnel length direction such as a tunnel section boundary. A water-stop structure that is formed along the direction and prevents running water such as spring water that has entered between the primary lining concrete and the secondary lining concrete from flowing out from one side in the length direction of the tunnel to the other side. Along with fixing the cylindrical sheet between the primary lining concrete and the secondary lining concrete at the predetermined location on the primary lining concrete surface so as to form a sealed filling chamber along the tunnel circumferential direction inside A filling pipe provided with a discharge hole for discharging a filling material in the filling chamber, and a permeable layer disposed so as to cover the periphery of the filling pipe, and an internal communication space in the permeable layer is raised. In the filled state with infusate provides a water stop structure of the tunnel, characterized in that formed by filling the infusate into the filling chamber.

Here, it is more preferable that the primary lining concrete surface is flattened with an embedding agent, and it is more preferable that the surface between the cylindrical sheet and the primary lining concrete and between the cylindrical sheet and the secondary lining concrete be used. It is more preferable to attach a water-absorbing member made of a water-swellable substance to at least one of them. Then, an auxiliary water-stopping member made of a water-swellable substance is disposed in the vicinity of the primary lining concrete surface at the predetermined location along the circumferential direction of the tunnel, and the auxiliary water-stopping member comes into contact with the secondary lining concrete. It is more effective to cover with a waterproof sheet.

That is, the water blocking 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 length direction of the tunnel, such as the boundary of the tunnel. The cylindrical sheet is formed between the primary lining concrete and the secondary lining concrete at a predetermined location where water is to be stopped in the tunnel so as to form a sealed filling chamber along the tunnel circumferential direction. Since the injection pipe fixed to the primary lining concrete surface and having a discharge hole for discharging the injection into the filling chamber and a permeation layer disposed so as to cover the periphery of the injection pipe were provided, Since the 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 material, the filling agent was filled. Tubular sheet by infusate is crimped to the secondary lining concrete. Then, when the filling agent filled in this state hardens, the water passage between the primary lining concrete and the secondary lining concrete is blocked in the length direction of the tunnel at the predetermined location, so that spring water or the like is formed. Can be stopped from flowing from one side of the tunnel length direction to the other side.

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 improved. Therefore, the water stoppage becomes more excellent. Further, if a water-absorbing member made of a water-swellable substance is attached to 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 the Even if a gap is created between the primary lining concrete and the secondary lining concrete and it is not possible to completely block the flowing water, the water-swellable substance of the water-absorbing member absorbs the water and swells. Since the gap is filled, the 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 in the vicinity of the primary lining concrete surface at the predetermined location along the circumferential direction of the tunnel, and a contact surface of the auxiliary water-stopping member with the secondary lining concrete is provided. Is covered with a water impermeable sheet, even if water leaks etc. enter the primary lining concrete side and a water passage is formed, the water swellable substance of the auxiliary waterproofing member absorbs the entering water and swells. As a result, the water passage is shut off, so that the water can be stopped more reliably.

Accordingly, by forming the water blocking structure of the tunnel of the present invention at a predetermined location in the length direction of the tunnel, such as the boundary of the tunnel, the spring that has entered between the primary lining concrete and the secondary lining concrete. The flow of water or the like from one side in the length direction of the tunnel to the other side can be reliably stopped at the predetermined location.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIGS. 1 and 2 illustrate an example of the structure of a water blocking structure of a tunnel according to the present invention. FIG. 1 shows the above-mentioned structure formed between a primary lining concrete and a secondary lining concrete. FIG. 2 is a cross-sectional view of the water stopping structure 1, and FIG. 2 is a schematic cross-sectional view of the tunnel schematically showing the inside of the tunnel for explaining the water stopping structure 1. The water blocking structure 1 includes a tunnel A (see FIG. 2) which is waterproofed by a waterproof sheet a.
After the surface of the primary lining concrete 2 near the tunnel side from the wellhead B is flattened along the circumferential direction of the tunnel with an embedding agent 2a such as mortar, the tubular sheet 3 is covered with the primary lining concrete 2 and the secondary lining. Closed filling room 5 between concrete 4
The protruding pieces (free ends for fixing the tubular sheet) 3a, 3a of the tubular sheet 3 are fixed to the surface of the primary lining concrete 2 along the circumferential direction of the tunnel so that the filling chamber 5 is formed. Injection pipes 7, 7 each having a plurality of discharge holes 7 a for discharging the injectant 6, and a permeation layer 8 disposed so as to cover the periphery of each injection pipe 7, 7.
And the internal communication space in the permeation layer 8 is
The filling material 5 is filled with the filling material 6 by filling the filling material 5 with the filling material 6 by filling the filling material 6 into the filling chamber 5 so that the filling material 5 is filled. Water absorbing members 9, 9 made of a water-swellable substance such as a water-swellable rubber are disposed between the second lining concrete 4 and the cylindrical sheet 3 and the embedding agent 2 a.

Here, the material of the tubular sheet 3 is not particularly limited, and is, for example, water-impermeable to a thermoplastic resin such as vinyl chloride, polyethylene, polypropylene, and ethylene-vinyl acetate copolymer (EVA). A sheet and the like. The shape and size of the tubular sheet 3 are not particularly limited, but, for example, as shown in FIG.
A filling chamber 5 is formed to such an extent that a permeation layer 8 surrounding the sheet 7 can be provided in the room, and both side ends of both sheets are released, and the tubular sheet is fixed to the primary lining concrete 2 surface. Projecting pieces 3a, 3a and waterproof sheet a
In order to form the protruding pieces 3b, 3b for joining with the like, the inner sides of both ends of both sheets are fixed linearly along the length direction in a linear manner by appropriate means such as bonding or heat welding to form a cylindrical shape. It is preferable to use the one formed as described above.

Note that the tubular sheet 3 is not limited to the above-described configuration. For example, one sheet is formed in a tubular shape,
Projecting pieces 3a, 3a, 3
b and 3b may be fixed by appropriate means such as adhesion or heat welding. Also, the sheet thickness of the tubular sheet 3 is not particularly limited, and has a strength such that it is not damaged at the time of placing the secondary lining concrete. If there is a gap, the thickness may have a certain degree of extensibility so as to be in close contact with the secondary lining concrete 4 by the injection pressure of the injection agent 6, and for example, in the case of an EVA sheet, 0.4 About 2.0 mm is preferable.

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. 1, but in the case of the present invention, the embedding agent 2a can bury the concave portion of the surface of the primary lining concrete 2 to flatten the surface. It is only necessary that the paint be applied to the extent along the tunnel circumferential direction. Although the size of the filling chamber 5 is not particularly limited, it is desirable that the filling chamber 5 has a certain width in the length direction of the tunnel in consideration of water stoppage efficiency. About 50 cm is preferable.

The type of the injecting agent 6 is not particularly limited, but can be easily injected into the injecting pipe 7 at the time of injecting, taking into consideration the function of the water blocking structure 1 and entering a small gap. It is necessary to be able to be cured in a relatively short time and not to shrink after the curing, and examples thereof include an epoxy resin, a two-part type or one-part type urethane resin, a cement slurry, and an ultrafine particle cement. it can. The injection pipe 7 has a pressure resistance enough to withstand the casting pressure of the secondary lining concrete and the injection pressure when the injection agent is injected, and is disposed along the circumferential direction on the primary lining concrete surface of the tunnel. Any material may be used as long as it is flexible enough to be installed. 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. 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 injectant. If it is too large, the pressure may not be sufficiently transmitted to every corner when the injectant is pumped, and uneven injection may occur.

In the case of this configuration example, each injection pipe 7 is
As shown in the figure, the injection parts 7b, 7 are attached in a ring shape along the circumferential direction of the tunnel on the surface of the primary lining concrete 2 and inject the injection agent after the secondary lining concrete is cast.
b and an air vent 7c for discharging air from the pipe when injecting the injectant are connected to each other. However, the injecting pipe of the present invention has one pipe as long as it is attached along the tunnel circumferential direction. For example, one injection pipe is disposed on each of the right and left sides of the upper half of the tunnel, and the lower end side of each injection pipe is provided with the injection sections 7b, 7b, and the upper end side is formed with the air release section 7c. In order to function in the same manner, the pipe is connected to the secondary lining concrete so that the leading end and the rear end of the pipe protrude out of the secondary lining concrete, and one injection pipe is similarly connected to the lower half of the tunnel. You may attach so that a front-end and a rear end may each protrude outside secondary lining concrete. In any case, it is necessary to attach the injection parts 7b, 7b and the air vent part 7c, or the secondary lining conductive part of each injection pipe so as not to impair the airtightness of the filling chamber 5.

The size and the number of the discharge holes 7a formed in the injection pipe 7 are not particularly limited, but considering the ease of discharging the injection, etc.
The injection pipe 7 having a hole diameter of 2 to 7 mm has a length of 10 to 30.
It is preferable that the opening is formed every 0 cm. 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 the inner diameter and length of the injection pipe 7 and the discharge hole 7a
Can be appropriately selected depending on the relationship with the hole diameter of the sample. In the case of this configuration example, two injection pipes 7, 7
Is provided in the filling chamber 5, but the number of injection pipes provided in the filling chamber 5 is not particularly limited, and may be one or three or more. However, considering that the filling chamber is completely filled with the filler and the inside air is completely expelled, 2 to 4 tubes are preferable.

The material of the permeable layer 8 is not particularly limited as long as it has an internal communication space so that the injection agent can penetrate. For example, a synthetic material such as palm, polyethylene, polypropylene, or polyester is used. A resin nonwoven fabric, a three-dimensional network, or the like 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 preferable to cover the entire surface in consideration of stabilizing the position of the injection pipe and securing the flow path of the injection agent.

The water-absorbing member 9 has a degree of flowing water,
The water-swellable substance forming the water-absorbing member 9 is appropriately provided depending on the completeness of the water stoppage, and includes, for example, water-swellable rubber and bentonite. The water-absorbing member 9 may be provided over the entire length of the tubular sheet 3 or may be provided by dividing it at an appropriate position.

Next, a method for stopping the water by forming the water stopping structure 1 at the wellhead B of the tunnel A (see FIG. 2) on which the waterproof sheet a is stretched will be described.

First, in a state in which a permeation layer 8 covering the outer peripheral surfaces of the injection pipes 7 and 7 is housed in a chamber of the filling chamber 5 formed of the cylindrical sheet 3 along the circumferential direction on the surface of the primary lining concrete 2 in a cylindrical shape. The projecting pieces 3a, 3a of the sheet 3 are attached to the surface of the primary lining concrete 2 along the circumferential direction with concrete nails or anchor bolts, and the fixing interval at this time is 15 to 5
0 mm is desirable.

Further, by connecting the projecting piece 3b of the tubular sheet 3 to the end of the waterproof sheet a in a liquid-tight manner, it can be integrated with the waterproof sheet a.

When the water absorbing member 9 is attached,
The method of attachment is not particularly limited, and may be attached to an appropriate position of the tubular sheet 3 with an adhesive or the like or by heat welding in advance, and after attaching the water absorbing member 9 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 tubular sheet.

The filling chamber 5 is filled with the filling material 5 in a state where the internal communication space in the permeable layer 8 is filled with the filling material 6. After the secondary lining concrete 4 is cast on the surface of the primary lining concrete 2 and hardened, the injection agent 6 is injected into the injection pipes 7, 7 from the injection parts 7b, 7b, and the pipe is injected from the air release part 7c. The injection agent 6 is discharged from each of the injection holes 7a of the injection pipes 7 and 7 to permeate the osmotic layer 8 while evacuating the air thereinto. 8 is filled with the injectant 6, and the space inside the filling chamber 5 is filled with the injectant 6.
Is filled, and when the injection starts to be discharged from the air vent 7c, the injection is completed, and the inlets of the inlets 7b, 7b and the outlet of the air vent 7c are closed by means such as filling mortar. Then, it is preferable that the filled injection material 6 is cured. Note that this injection work is performed on the cylindrical sheet 3.
It is necessary that the filling agent 5 is filled in the filling chamber 5 which is formed inside and is closed in a liquid-tight manner without any gap, and the filling is completed before the filling material 6 is cured.

When the water stopping structure 1 is formed in this manner, the cylindrical sheet 3 is interposed between the filling chamber 5 and the secondary lining concrete, so that the secondary lining concrete is cast. In the case where concrete is prevented from entering the filling chamber 5 at the time of setting, and when the secondary lining concrete hardens, it shrinks due to drying and shrinkage, and a gap is generated between the tubular sheet 3 and the secondary lining concrete 4. However, the cylindrical sheet 3 is stretched by the injection pressure of the injection agent 6, and the primary lining concrete 2
Surface and the secondary lining concrete 4.

As described above, by forming the water blocking structure 1 between the primary lining concrete 2 and the secondary lining concrete 4 near the tunnel side of the pit portion B of the tunnel A, along the circumferential direction of the tunnel, A waterway in the length direction of the tunnel, such as spring water, formed between the primary lining concrete 2 and the secondary lining concrete 4 of the waterproofed tunnel can be blocked in front of the wellhead B, Furthermore, a tubular sheet 3
And primary lining concrete 2 and secondary lining concrete 4
Even if water enters between the tunnels, the water is absorbed by the water absorbing member 9, so that spring water from the ground of the tunnel or the like can be reliably prevented from flowing at the wellhead B.

As shown in FIG. 3, an auxiliary water-stopping 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. Is fixed with concrete nails or the like along the circumferential direction of the tunnel, and the contact surface of the auxiliary waterproof member 11 with the secondary lining concrete 4 is covered with a waterproof sheet 12 to form the filling chamber 5 of the waterproof structure 1. If the protruding piece 3b of the tubular sheet 3 on the side of the wellhead B and the side end 12a of the impermeable sheet 12 adjacent thereto are fixed in a liquid-tight manner by heat bonding or the like, if water leaks to the primary lining concrete side temporarily, Even if water enters and a water passage is formed, the water swellable substance of the auxiliary water stopping member 11 absorbs the incoming water and swells to block the water passage, so that the water is more reliably stopped. Can be. In this case, instead of the tubular sheet 3 and the water-blocking sheet 12, the filling chamber 5 is provided inside the sheet by using a projecting length of the projecting piece 3b of the tubular sheet 3. It is preferable that the auxiliary water-stopping member 11 be covered with the protruding piece 3b while being formed.

Further, the water-stop structure 1 is formed at two locations on the tunnel side of the wellhead B with a slight distance in the length direction of the tunnel, and the auxiliary water-stop structure covered with a water-blocking sheet 12 or the like therebetween. If the member 11 is placed, water can be completely stopped.

[0028] The water blocking structure of the tunnel according to the present invention is not limited to the above configuration, and may be variously modified without departing from the gist of the present invention.

[0029]

According to the waterproof structure of the tunnel of the present invention,
It is easy for running water such as spring water to flow from one side of the tunnel length direction to the other side between the primary lining concrete and the secondary lining concrete of the tunnel at a predetermined location in the tunnel length direction such as a construction zone boundary, And it can be prevented reliably. Therefore, in the tunnel waterproofing structure of the present invention, for example, spring water or the like in the tunnel section flows between the primary lining concrete and the secondary lining concrete and flows out of the tunnel section along with waterproofing of the tunnel. It is also particularly useful for preventing water outside the tunnel section from flowing into the tunnel section at the tunnel entrance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a water stop structure for explaining one configuration example of a water stop structure of the present invention.

FIG. 2 is a schematic cross-sectional view of a tunnel illustrating 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 (predetermined location) 1 Waterproof structure 2 Primary lining concrete 3 Tubular sheet 4 Secondary lining concrete 5 Filling chamber 6 Injectant 7 Injection pipe 7a Discharge hole 8 Permeation layer 9 Water absorbing member 11 Auxiliary water stop Member 12 impermeable sheet

Claims (4)

[Claims] Claims: 1. A primary lining concrete and a secondary lining concrete are formed along a circumferential direction between a primary lining concrete and a secondary lining concrete at a predetermined position in a tunnel length direction such as a boundary of a tunnel.
A waterproof structure that prevents flowing water such as spring water that has entered between the primary lining concrete and the secondary lining concrete from flowing out from one side in the length direction of the tunnel to the other side. A cylindrical sheet is fixed between the primary lining concrete and the secondary lining concrete on the surface of the primary lining concrete so as to form a sealed filling chamber along the circumferential direction of the tunnel inside, and an injecting agent is introduced into the filling chamber. A filling pipe provided with a discharge hole for discharging the liquid and a permeable layer disposed so as to cover the periphery of the filling pipe, and filling the internal communication space in the permeable layer with the filling material filled with the filler. A water blocking structure for a tunnel, wherein a room is filled with the injection agent. 2. The waterproof structure according to claim 1, wherein said primary lining concrete surface is flattened by an embedding agent. 3. A water absorbing member made of a water-swellable substance is attached to at least one of between the tubular sheet and the primary lining concrete and between the tubular sheet and the secondary lining concrete. 2. The waterproof structure according to 2. 4. 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 auxiliary water-stopping member is provided with a secondary lining concrete of the auxiliary water-stopping member. The waterproof structure according to claim 1, 2 or 3, wherein the contact surface is covered with a waterproof sheet.