JP2002129898A - Waterproofing sheet and construction method for making tunnel watertight and for draining water therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow efficient construction work for making a tunnel watertight and for draining water therefrom, which is particularly useful when draining water springing from the primary lining concrete side of the tunnel, by enabling the operation of arranging water conducting members to be performed concurrently with the operation of laying a waterproofing sheet. SOLUTION: The waterproofing sheet 10 comprises a water-permeable sheet 3 laid on one side of a water-impermeable sheet 2. A back water draining member 4 is mounted at or near one longitudinal end of the water-permeable sheet 3 along the cross direction of the sheet in such a manner as to be movable in the longitudinal direction of the waterproofing sheet 10. The waterproofing sheets 10 are circumferentially and sequentially laid in the tunnel, with their water-permeable sheet 3 sides facing the wall of the tunnel to be constructed. The back water draining member 4 mounted on one waterproofing sheet 10 and another back water draining member 4 mounted on another waterproofing sheet 10 adjacent to the one waterproofing sheet 10 are connected together by a connecting member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof sheet used for waterproofing a tunnel and a method for waterproofing a tunnel using the waterproof sheet.

[0002]

2. Description of the Related Art
Impermeable as a waterproof sheet stretched between the primary lining concrete and the secondary lining concrete to prevent water from leaking from the primary lining concrete side to the secondary lining concrete side There is known a structure in which a water-permeable sheet such as a nonwoven fabric is laminated on one surface of a synthetic resin sheet.

[0003] In this conventional waterproof sheet, a water-impermeable synthetic resin sheet is arranged and stretched on the primary lining concrete side, and spring water from the primary lining concrete side is used for the primary lining concrete or water permeable. When the waterproof sheet is stretched in this way, a water-guiding material such as a perforated pipe used for drainage on the back side is separately arranged below the waterproof sheet, and the spring that flows down In addition to flowing water into the water guide, the water guide is connected to a transverse drain pipe connected to the center drain and discharged to the outside.

However, the work of arranging such a water guide material is relatively troublesome, and the work of installing a waterproof sheet must be provided separately from the work of setting up a waterproof sheet at the work site. Is complicated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a waterproof sheet capable of facilitating the work of arranging a water guiding material and avoiding complicated waterproofing work, and a primary covering using the waterproof sheet. It is an object of the present invention to provide a tunnel drainage prevention method capable of easily and surely discharging spring water and the like from a concrete work side to the outside.

[0006]

In order to achieve the above object, the present invention provides (1) a waterproof sheet obtained by laminating a water-permeable sheet on one surface of a water-impermeable sheet, wherein at least At one end or in the vicinity of one end in the length direction, a back surface drainage material is attached along the width direction of the sheet, and movably attached in the length direction of the waterproof sheet, more preferably the back surface drainage. A tarpaulin is provided wherein the material has a length substantially equal to the width of the tarpaulin.

Here, the waterproof sheet is one in which the back surface drainage material is partially held by an attachment member fixed to the water permeable sheet, or a surface provided with a large number of locking projections on one surface. Attaching a fastener to the outer peripheral surface of the back surface drainage material so that the locked projections are on the outside, and the water-permeable sheet has a locking portion for locking the locked projections, The hook-and-loop fastener is locked to a locking portion of the water-permeable sheet, or the back surface drainage material is inserted between a mesh sheet fixed to the water-permeable sheet and the water-permeable sheet. Is more preferable.

The waterproof sheet has a non-joined portion between the water-permeable sheet and the water-impermeable sheet at a position where the back-surface drainage material is attached to the water-permeable sheet, and the back-surface drainage material is provided at the unjoined portion. Or the waterproof sheet is formed by bending an end of the water-permeable sheet in the length direction of the mounting position of the back surface drainage material, and holding the back surface drainage material by the bent portion. However, it is more preferable.

Further, it is more preferable that such a waterproof sheet is wound around the above-mentioned back surface drainage material as a core.

The present invention further provides (2) the waterproof sheet according to (1), wherein the water-permeable sheet side faces the construction wall of the tunnel, and is sequentially stretched along the circumferential direction in the tunnel. Provided is a method for preventing drainage of a tunnel, wherein the drainage material attached to the waterproof sheet and the drainage material attached to the waterproof sheet adjacent to the waterproof sheet are sequentially connected by a connecting member.

Here, it is more preferable that the back surface drainage material is fixed to the construction wall of the tunnel by a band-shaped member.

That is, in the waterproof sheet of the present invention, a back surface drainage material is provided at least at one end or in the vicinity of one end of the water permeable sheet in which the water permeable sheet is laminated on one surface of the water impermeable sheet. Since it is attached along the width direction of the sheet, it is also possible to arrange a back surface drainage material (water guide material) by stretching the waterproof sheet. Therefore, it is necessary to arrange a water guide material separately from the stretching work. And waterproofing work can be performed efficiently. Here, if the back drainage material has a length substantially equal to the width of the waterproof sheet,
The installation work can be performed more efficiently.

In the case of the waterproof sheet according to the present invention, since the back surface drainage material is attached so as to be movable in the length direction of the waterproof sheet, for example, as described later, the waterproof sheet is sequentially stretched in the circumferential direction of the tunnel. When connecting one back drainage material and the back drainage material adjacent thereto, even if the back drainage material is attached to the waterproof sheet, the position adjustment (height adjustment) thereof can be easily performed.

In the present invention, the structure for attaching the back surface drainage material to the water permeable sheet is not particularly limited as long as the back surface drainage material is attached so as to be movable in the length direction of the waterproof sheet. As specifically described below, if the back surface drainage material is partially held by an attachment member fixed to the water permeable sheet, the back surface drainage material is attached to the water permeable sheet in the length direction of the waterproof sheet. It can be mounted movably.

More specifically, for example, a suitable number of strip-shaped or string-shaped flexible members of an appropriate length are formed, and the sheet is formed so as to form a position adjustment section in the sheet length direction of the back surface drainage material. The water-permeable sheet is placed along the length of the sheet at a position (attachment position) where the back surface drainage material is to be attached on the front surface of the water-permeable sheet. And the flexible member and the water-permeable sheet hold the back surface drainage material. The flexible member is wound around the back surface drainage material, and each edge of the flexible member is water-permeable. A configuration in which the back surface drainage material is attached to a water-permeable sheet by being fixed to a sheet is mentioned. In this case, the back surface drainage material wound around the flexible member is rolled in a desired direction or pulled, so that a waterproof sheet is provided. In It is possible to perform the position adjustment in the sheet length direction of the surface drainage material.

Further, an appropriate number of band-like or string-like elastic members such as rubber straps are used, one end of the elastic member is fixed to the other surface of the water-permeable sheet, and the other end of the elastic member is connected to the above-mentioned end. There is a configuration in which a position adjustment section in the sheet length direction of the back surface drainage material is formed by winding around the back surface drainage material and utilizing the elasticity of the elastic member.

On the other hand, in the waterproof sheet of the present invention, a hook-and-loop fastener having a large number of locked projections on one surface is attached to the outer peripheral surface of the back drainage material so that the locked projections are on the outside. The water-permeable sheet may have a locking portion for locking the locked projection, and the back fastener may be locked to the locking portion of the water-permeable sheet. A material can be attached to the water-permeable sheet so as to be movable in the sheet length direction. In this case, it is possible to adjust the position of the back drainage in the sheet length direction by rolling the back drainage with the hook-and-loop fastener, or once peeling off the hook-and-loop fastener from the water-permeable sheet and locking it again at a desired position. it can.

Further, in the waterproof sheet of the present invention, the back drainage material is inserted between the mesh sheet fixed to the water permeable sheet and the water permeable sheet, more specifically, for example, the water permeable sheet At the mounting position of the backside drainage material on the front surface, a net-like sheet having a length capable of forming a position adjustment section of the backside drainage material is covered, and the backside drainage material is provided between the mesh sheet and the water-permeable sheet. For example, the leading edge and the trailing edge of the mesh sheet are fixed along the width direction of the water-permeable sheet so as to be sandwiched, and the back surface drainage material is inserted between the mesh sheet and the water-permeable sheet. With this configuration, the back surface drainage material attached to the water permeable sheet can be moved in the position adjustment section formed by the mesh sheet.

Further, the waterproof sheet has a non-joined portion between the water-permeable sheet and the water-impermeable sheet at a position where the back-surface drainage material is attached to the water-permeable sheet, and a back-surface drainage material is attached to the unjoined portion. In the inserted configuration, more specifically, for example, at the mounting position of the back surface drainage material of the water permeable sheet, a position adjustment section in the sheet length direction of the back surface drainage material is formed along the sheet length direction. By making an unjoined portion between the water-permeable sheet and the water-impermeable sheet, and inserting the back surface drainage material into the unjoined portion, the back-surface drainage material is placed between the water-permeable sheet and the water-impermeable sheet. If it is made to sandwich between, the back surface drainage material attached to the water-permeable sheet can be moved in the position adjustment section formed by the unjoined portion.

Still further, the waterproof sheet may be formed by bending the longitudinal end of the water-permeable sheet on the side of the mounting position of the back drainage material, and holding the back drainage material by the bent portion. The lengthwise end of the water-permeable sheet in the mounting portion side of the backside drainage material is appropriately lengthened from the lengthwise end of the water-impermeable sheet so that the position adjustment section of the backside drainage material is formed. And extending the bent end, fixing the leading edge of the extended end to the water-permeable sheet body, and overlapping the bent portion with the water-permeable sheet body. By inserting the back surface drainage material between them, if the back surface drainage material is sandwiched between the permeable sheet main body and the extended end portion, the back surface drainage material attached to the permeable sheet is bent. In the above position adjustment section formed by the part There can be moved.

Further, if the waterproof sheet is wound around the back drainage material as a core, the waterproof sheet is stored, the waterproof sheet is transported to the site, and the waterproof sheet is further attached to the construction wall. It is very suitable because it makes it easier to handle and makes it unnecessary to use a separate core.

In the method for preventing drainage of a tunnel according to the present invention, the waterproof sheet is stretched along the circumferential direction of the tunnel in such a manner that the water-permeable sheet side faces the construction wall of the tunnel. Since the back drainage material attached to the waterproof sheet and the back drainage material attached to the waterproof sheet adjacent to the waterproof sheet are sequentially connected by a connecting member, the work of stretching the waterproof sheet and distributing the back drainage material are performed. In this case, a work for forming a water channel using the back drainage material as a water guiding material can be performed.

According to the method for preventing drainage of a tunnel according to the present invention, for example, if the construction wall is a primary lining concrete, after the secondary lining concrete is cast, a spring or the like from the primary lining concrete side may be used. While preventing leakage to the secondary lining concrete side, when spring water from the ground flows down through the primary lining concrete or the permeable sheet, the flowing spring water etc. flows into the backside drainage material Therefore, for example, by connecting a drainage pipe leading to a sewer to a headrace formed by the connected backside drainage material, it is possible to discharge discharged spring water and the like efficiently to the outside.

Here, in the above construction method, when the backside drainage material is further fixed to the construction wall of the tunnel with a belt-like member, the connected backside drainage material moves due to, for example, the pressure of the secondary lining concrete. It is possible to effectively prevent a situation in which the back drainage material is disconnected due to the movement or the movement, and the water conduit formed by the connected back drainage material is broken.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a schematic perspective view illustrating a mounting position of a back surface drainage material of a waterproof sheet 10 for explaining a first configuration example of a waterproof sheet of the present invention. Here, the waterproof sheet 10 is formed by laminating the water-permeable sheet 3 on one surface of the water-impermeable sheet 2, and one end of the surface 3 a of the water-permeable sheet 3 in the longitudinal direction has a back surface drainage material. 4 are placed. This back surface drainage material 4 is provided at each end 5a, 5a, 5 of two strip-shaped flexible members (attachment members) 5, 5 of appropriate length.
a, 5a are fixed to the water permeable sheet 3 so as to form a position adjustment section (arrow L in the figure) of the back surface drainage material 4 in the sheet length direction, and these flexible members 5, 5 and the water permeable sheet 3
Thus, it is attached to the water-permeable sheet 3 so as to be movable in the length direction of the sheet.

Here, the material and size of the water-impermeable sheet 2 are not particularly limited, and the water-impervious sheet 2 is usually placed between the primary lining concrete and the secondary lining concrete when waterproofing the tunnel. A water-impermeable sheet interposed in can be used, for example, a thermoplastic synthetic resin such as polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and the like. About 0.5-6m, length 10-40
m and a thickness of about 0.4 to 2.5 mm.

The material of the water-permeable sheet 3 is not particularly limited, and a water-permeable sheet laminated on the water-impermeable sheet 2 usually used for waterproofing tunnels may be used. Can be, for example, non-woven, woven,
A water-permeable sheet made of a knitted fabric or the like can be given, and among them, a nonwoven fabric is particularly preferable. And the size can be set appropriately according to the impermeable sheet 2 to be laminated.

The water-impermeable sheet 2 and the water-permeable sheet 3
Lamination can be performed by using an appropriate method such as heat bonding or bonding using an adhesive, and by partially bonding or entirely bonding the two sheets.

The material and the shape of the back drainage 4 are not particularly limited, and a back drainage which is usually used as a water guiding material for drainage construction of a tunnel can be used, for example, as shown in FIG. As described above, a plurality of ring portions 4b are formed on the outer peripheral surface of the tube main body 4a at predetermined intervals in the length direction, the outer surface thereof has a substantially wavy shape, and the tube main body 4a between the ring portions 4b is formed. For example, a perforated pipe having a plurality of holes 4c at predetermined intervals in the circumferential direction is preferably used. In addition, not only a cylindrical body but also a square cylindrical body may be used. The material of the back surface drainage material 4 preferably has a certain degree of flexibility, impact strength, wear resistance, and corrosion resistance.
For example, ethylene polymers such as high density polyethylene,
Polyester, polypropylene, vinyl chloride and the like are preferably used. In FIGS. 1 and 3 to 9, the perforated pipe of the back surface drainage material 4 is shown without a ring portion and a hole portion.

Here, the size of the back surface drainage material 4 is not particularly limited, and the same size as that usually used as a water guide material for a tunnel can be used. On the other hand, as will be described later, the length of the back surface drainage material 4 is determined by considering that a waterproof sheet is sequentially stretched on the construction wall of the tunnel and the back surface drainage materials of the adjacent waterproof sheets are connected to form a water channel. Then, it is desirable that the waterproof sheet 10 has a length substantially equal to the sheet width of the waterproof sheet 10 to be attached.

The material and size of the flexible member 5 are not particularly limited.
A vinyl acetate copolymer, a polyolefin sheet such as polyethylene or polypropylene, a polyester or polypropylene woven or non-woven fabric, or the like may be used in the form of a strip or a string. Is a length capable of forming a position adjustment section (arrow L in the figure) in the sheet length direction, and the position adjustment section L is usually 10 to 10.
200 cm, especially about 30 to 150 cm, is suitable.

Here, each end or each end of the flexible members 5 and 5 is fixed to the water-permeable sheet 3 so as to form a position adjustment section (arrow L in the figure) of the back surface drainage material 4. Instead of the structure of the waterproof sheet 10, the respective ends of the flexible members 5 and 5 wound around the back surface drainage material 4 like the waterproof sheet 11 of the second configuration example shown in FIG. 3, for example. 5
a, 5a, 5a, 5a may be fixed to the water permeable sheet 3 and the back surface drainage material 4 may be attached to the water permeable sheet 3 so as to be movable in the sheet length direction.

The method of fixing the respective ends 5a, 5a, 5a, 5a of the flexible members 5, 5 to the water-permeable sheet 3 is not particularly limited, and may be performed by heat welding, bonding with an appropriate adhesive, or the like. Can be fixed.

Here, the holding position of the back surface drainage material 4 by the flexible members 5 and 5 is not particularly limited. It is desirable to keep the position in the vicinity of one third to one quarter. The number of the flexible members 5 and 5 used, that is, the holding position of the back surface drainage material 4 is not limited to two places. For example, when a longer back surface drainage material is used, three flexible members are used. If a member is prepared and the vicinity of the center in the longitudinal direction of the back surface drainage member 4 is further pressed, the back surface drainage member 4 can be more reliably attached to the water permeable sheet 3.

The waterproof sheet of the present invention has a back drainage material attached to at least one end in the sheet length direction or its vicinity, and has a back drainage material at both ends in the sheet length direction or in the vicinity thereof. Of course, it may be attached.

Next, a third structural example of the waterproof sheet of the present invention will be described with reference to FIG. This waterproof sheet 12 uses strip-shaped elastic members 51, 51 (attachment members) instead of the above-mentioned flexible members, and one end 51a of each of the elastic members 51, 51.
51a is fixed to the surface 3a of the water-permeable sheet 3, and
The other end of each of the elastic members 51, 51 and the vicinity of the other end 51.
b, 51b are wound around the back surface drainage material 4 and held there, and by utilizing the lengths of the elastic members 51, 51 and their elasticity, a position adjustment section of the back surface drainage material 4 in the sheet length direction (FIG. The movement of the middle arrow L) is enabled.

Here, the elastic member 51 is formed of the back drainage material 4.
The material and the like are not particularly limited as long as the material has elasticity and length enough to form the position adjustment section (arrow L in the figure), for example, a belt-shaped rubber or elastomer is used. be able to. In addition, a string-shaped or coil-shaped member can be used as the elastic member.

The method of fixing the elastic member 51 to the water permeable sheet 3, the number of the members to be used, the winding position of the back surface drainage material 4, and the like are as follows.
There is no particular limitation, and an appropriate number can be wound around the same position as the above-mentioned flexible member by heat welding or bonding with an adhesive as appropriate.

As shown in FIG. 5, the waterproof sheet 13 according to the fourth configuration example of the present invention has a hook-and-loop fastener (attachment member) having a large number of locked projections (omitted in the drawing) on one surface. 52, 52 are respectively wound around the outer peripheral surface of the back surface drainage material 4 in a ring shape such that the locked projections are on the outside,
The surface fasteners 52, 52 are placed on the front surface 3a of the water-permeable sheet 3 having a locking portion for locking the locking projection, such as a nonwoven fabric. Is fixed to the permeable sheet 3 and the back surface drainage material 4 is attached to the permeable sheet 3.

In the case of the waterproof sheet 13, the back surface drainage material 4 with the hook-and-loop fasteners 52, 52 is rolled on the water-permeable sheet 3, or is once peeled off from the water-permeable sheet 3, and is stopped again at a desired position. Since the position adjustment in the length direction can be performed, the position adjustment section of the back surface drainage material 4 extends over the entire length of the water-permeable sheet 3.

Further, as shown in FIG. 6, the waterproof sheet 14 according to the fifth configuration example of the present invention is a position adjustment section (arrow L in the figure) of the back surface drainage material 4 of the water permeable sheet 3 in the sheet length direction. Is not joined to the water-impermeable sheet 2, and an unjoined portion 6 of the water-permeable sheet 3 and the impermeable sheet 2 is formed in this section, and the back surface drainage material 4 is formed by the unjoined portion 6. The back drainage member 4 is inserted into the space, and the back drainage member 4 is sandwiched between the water-permeable sheet 3 and the water-impermeable sheet 2 so that the back drainage member 4 is attached to the water-permeable sheet 3 so as to be movable in the longitudinal direction of the sheet. is there.

Further, as shown in FIG. 7, in the waterproof sheet 15 according to the sixth configuration example of the present invention, the water-permeable sheet 3 has the same length or the water-permeable sheet 3 as the water-impermeable sheet 2. It is suitable that at least one end in the length direction of the water-permeable sheet 3 extends outward from one end in the length direction of the water-impermeable sheet 2. In this case, the extension length of the extension end 3b of the water-permeable sheet 3 is such that when the extension end 3b is folded, the bent portion has a position adjustment section (in the sheet length direction of the back surface drainage material 4). It is preferable that the length is such that it can be an arrow L) in the figure.

Then, the extended end 3b is bent,
The leading edge 3c of the extension end 3b is fixed to the water-permeable sheet main body 3d by appropriate means such as heat welding and bonding, and is formed in a space formed between the bent extension end 3b and the water-permeable sheet main body 3d. By inserting the back surface drainage material 4 and sandwiching the back surface drainage material 4 between the permeable sheet main body 3d and the extending end 3b, the back surface drainage material 4 can be moved to the permeable sheet 3 in the sheet length direction. It is attached.

Further, as shown in FIG. 8, the waterproof sheet 16 according to the seventh configuration example of the present invention forms a position adjustment section (arrow L in the figure) of the back surface drainage material 4 in the sheet length direction. A net-like sheet 7 having a length to be obtained is used, the net-like sheet 7 is put on a predetermined position on the surface 3a of the water-permeable sheet 3, and the leading edge 7a and the rear edge 7b of the net-like sheet 7 are respectively set to the width of the water-permeable sheet 3. The back surface drainage material 4 is fixed between the mesh sheet 7 and the water permeable sheet 3 by heat welding or bonding along the direction, and the water back sheet 4 and the net sheet 7 separate the back surface drainage material 4. It is what was pinched.

Here, the material and mesh of the mesh sheet 7 are not particularly limited, and as the material, for example, a polyolefin resin such as polyethylene and polypropylene, polyester, metal and the like are preferably used.
The width of the mesh sheet 7 may be any width as long as it can hold the back surface drainage material 4, and may be the same as the water permeable sheet 3 or smaller than the width of the water permeable sheet 3. Good.

The method for manufacturing the waterproof sheets 10 to 16 is not particularly limited, and any method can be adopted as long as the above structure is obtained.

The waterproof sheets 10 to 16 can be wound, for example, by preparing a core separately.
It is very suitable to take up the core in a roll shape, since the handling of the waterproof sheet during storage, transport to the site, and stretching work is improved. In addition, when the back surface drainage material 4 is attached to both ends of the waterproof sheet 1, it can be wound so as to wind around glasses.

Next, an example of the construction of the method for preventing drainage of a tunnel according to the present invention using the waterproof sheets 10 to 16 will be described below with reference to FIG. In FIG. 9, the waterproof sheets 10 to 16 are shown as waterproof sheets 1, and the waterproof sheets have rear-surface drainage members 4 and 4 attached to both ends, respectively. Here, FIG. 9 illustrates one configuration example of the tunnel drainage prevention method of the present invention.
FIG. 2 is a schematic perspective view showing a state where the waterproof sheet 1 is stretched on a primary lining concrete surface of a tunnel A.

In FIG. 9, the ground B of the tunnel A is
Primary lining concrete 8 has been cast and tunnel A
A central drain 9 is formed in the center of the underground, and an appropriate number of transverse drainage pipes 10 are formed in the center drain 9.
Communicates.

The required number of waterproof sheets 1 in this tunnel A
While the waterproof sheet 1 is unwound, the water-permeable sheet side faces the primary lining concrete 8 surface, and is sequentially stretched along the circumferential direction of the tunnel according to a conventional method, and is adjacent to each other. The back surface drainage members 4 and 4 attached to the waterproof sheets 1 and 1 are sequentially connected by a connecting member 11.

Here, the connection method of the connecting member 11 is not particularly limited.
The joint may be formed by fitting to the inner peripheral surface of each end of each of the ends, and may be fitted to the outer peripheral surface of each end of the back surface drainage members 4, 4. It may be of the type. Further, the connecting member 11 is provided with the back surface drainage materials 4 and 4.
It may be a socket-like member fitted into each end of the backside drainage member from inside or outside, or a band-shaped member wound around each end of the backside drainage members 4 from outside to form a connecting member.

The material and the like of the connecting member 11 are not particularly limited.
Polyolefin resins such as polypropylene, polyvinyl chloride, and the like can be suitably used.

In this connection, the waterproof sheet 1 is placed on the waterproof sheet by moving the back drainage material in a desired direction, such as by rolling or pulling the back drainage material. Adjustments can be made.

As shown in FIG. 10 in an enlarged manner, the intermediate member 12a in the longitudinal direction of the belt member 12 is bent along the outer peripheral surface of the back drain member 4, and the belt member not in contact with the back drain member 4 is bent. Each of the twelve straight portions 12b and 12c is fixed to the primary lining concrete 8 by an appropriate number of concrete nails 13. Here, the material and the like of the belt-shaped member are not particularly limited, and for example, a steel plate such as a zinc-iron plate, a plastic band or the like can be suitably used. Here, as the fixing position by the band-shaped member 12, for example, a portion of the back surface drainage material 4 to which the band-shaped member is fitted, a portion of the vicinity of or adjacent to the adjacent back surface drainage material, which is connected to the band-shaped member is suitable.

As shown in FIG. 11, the belt-shaped member 12 is formed by curving the middle portion 12a in the longitudinal direction to have a substantially U-shaped side surface, and having one straight portion outward at a position substantially half the length. When the deformed U-shaped band-shaped member 12 having the bent portion (bent straight portion) 12b is bent, it is easy to follow the outer peripheral surface of the backside drainage material and abut against the construction wall, so that the backside drainage material is fixed. This is more preferable because the work efficiency of the method is improved.

In this modified U-shaped band-shaped member 12, the straight portion 12c which has not been bent at the time of the fixing operation is obliquely widened, the back surface drainage material is inserted into the curved portion of the longitudinal middle portion 12a, and the bent straight portion 12b is formed. Is brought into contact with a concrete surface, a concrete nail is driven into the concrete wall, and the expanded straight portion 12c is pushed and bent so as to come into contact with the concrete surface. In addition to the fixing method shown in FIG. 10, the present invention is also suitable for a case where the straight portions 12 b and 12 c are overlapped and fixed to the primary lining concrete by the concrete needle 13.

Along with the work of stretching the waterproof sheet as described above, after the work of arranging and connecting the back surface drainage material 4 to form the water conduit, or while performing the work, The located back surface drainage material 4 is connected to the drain pipe 10.
Here, the means for connecting to the drainage pipe 10 is not particularly limited. For example, when a branch pipe is provided in the backside drainage material 4 of the connection portion or when the connection portion corresponds to the connection portion of the backside drainage materials 4 and 4, It is preferable to use a T-tube as a joint between the members 4 and 4. When connecting the drainage pipe 10 to the main body of the backside drainage material, a half T-shaped pipe or the like is also suitable.

By performing the drainage prevention work on the tunnel A in this way, it is possible to prevent the spring water from the primary lining concrete 8 from leaking to the secondary lining concrete side after the secondary lining concrete is poured. At the same time, the spring water from the ground side flowing down through the primary lining concrete 8 or the permeable sheet flows into the back surface drainage material 4 forming the headrace channel,
Spring water and the like can flow to the center drain 9 through a drain pipe 10 connected to the drain pipe 10 and be discharged to the outside.

The present invention is not limited to the above configuration, and may be variously modified without departing from the gist of the present invention.

[0060]

According to the present invention, the work of arranging the water guide can be performed in parallel with the work of stretching the waterproof sheet.
Waterproofing work is performed efficiently. Therefore, the present invention is particularly useful when draining spring water from the primary lining concrete side to the outside in drainage prevention construction of a tunnel.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a waterproof sheet for explaining a first configuration example of a waterproof sheet of the present invention.

FIG. 2 is a schematic front view of a perforated pipe as an example of a backside drainage material used for the waterproof sheet of the present invention.

FIG. 3 is a schematic perspective view of a waterproof sheet illustrating a second configuration example of the waterproof sheet of the present invention.

FIG. 4 is a schematic perspective view of a waterproof sheet illustrating a third configuration example of the waterproof sheet of the present invention.

FIG. 5 is a schematic perspective view of a waterproof sheet illustrating a fourth configuration example of the waterproof sheet of the present invention.

FIG. 6 is a schematic perspective view of a waterproof sheet for explaining a fifth configuration example of the waterproof sheet of the present invention.

FIG. 7 is a schematic perspective view of a waterproof sheet illustrating a sixth configuration example of the waterproof sheet of the present invention.

FIG. 8 is a schematic perspective view of a waterproof sheet for explaining a seventh structural example of the waterproof sheet of the present invention.

FIG. 9 is a schematic perspective view of a tunnel illustrating one configuration example of a drainage prevention method according to the present invention.

FIG. 10 is a schematic sectional view illustrating an example of a belt-shaped member used in the drainage prevention method of the present invention.

FIG. 11 is a side view illustrating an application example of the belt-shaped member used in the drainage prevention method of the present invention.

[Explanation of symbols]

 A Tunnel 1,10-16 Waterproof sheet 2 Water-impermeable sheet 3 Water-permeable sheet 3b Extended end 4 Backside drainage material 5 Flexible member (attachment member) 51 Elastic member (attachment member) 52 Surface fastener 6 Not joined Part 7 Reticulated sheet 8 Primary lining concrete (construction wall) 11 Connecting member 12 Belt member

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshiaki Takahashi 1-4-16 Nimagashi-cho, Nihonbashi, Chuo-ku, Tokyo Fujimori Industries Co., Ltd. F-term (reference) 2D055 HA01 LA02 LA03

Claims (10)

[Claims] 1. A waterproof sheet comprising a water-permeable sheet laminated on one surface of a water-impermeable sheet, wherein a back-surface drainage material is provided on at least one end of the water-permeable sheet at or near one end in the longitudinal direction. A waterproof sheet attached along the width direction of the waterproof sheet and movably in the longitudinal direction of the waterproof sheet. 2. The waterproof sheet according to claim 1, wherein the back drainage material has a length substantially equal to a width of the waterproof sheet. 3. The waterproof sheet according to claim 1, wherein the back drainage material is partially held by a mounting member fixed to the water permeable sheet. 4. A hook-and-loop fastener provided with a large number of locked projections on one surface is attached to the outer peripheral surface of the back surface drainage material such that the locked projections are on the outside, and the water-permeable sheet is provided with the above-mentioned water-permeable sheet. The waterproof sheet according to claim 1 or 2, further comprising a locking portion for locking the locked projection, wherein the hook-and-loop fastener is locked to the locking portion of the water-permeable sheet. 5. The waterproof sheet according to claim 1, wherein the back drainage material is inserted between the mesh sheet fixed to the water permeable sheet and the water permeable sheet. 6. The waterproof sheet has an unbonded portion between the water-permeable sheet and the water-impermeable sheet at a position where the back-surface drainage material is attached to the water-permeable sheet, and the back-surface drainage material is provided at the unjoined portion. The waterproof sheet according to claim 1, wherein a waterproof sheet is inserted. 7. The waterproof sheet according to claim 1, wherein an end of the water-permeable sheet in the length direction of the mounting position of the back surface drainage material is bent, and the bent portion holds the back surface drainage material. 8. The waterproof sheet according to claim 1, wherein the back surface drainage material is wound around a core. 9. The waterproof sheet according to claim 1, wherein the water-permeable sheet side faces the construction wall of the tunnel, and is sequentially stretched in the tunnel along the circumferential direction. A method for preventing drainage in a tunnel, comprising: sequentially connecting, by a connecting member, the back surface drainage material attached to a waterproof sheet and the back surface drainage material attached to a waterproof sheet adjacent to the waterproof sheet. 10. The tunnel drainage prevention method according to claim 9, further comprising fixing the back surface drainage material to a tunnel installation wall with a belt-shaped member.