JPH1061393A - Structure and method for attaching cutoff sheet for tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a cutoff sheet securely enough to avoid formation of a space near a tunnel ceiling during placing of lining concrete by providing initially a means for preventing the cutoff sheet from hanging down near the tunnel ceiling, when expanding the cutoff sheet over a spraying concrete surface. SOLUTION: A cutoff sheet 1, with at least both side edges fixed along the direction of a tunnel axis, is mounted on a spraying concrete surface 5 inside a tunnel 4 and along the circumferential direction of the tunnel, and a lining concrete layer 6 forming the interior wall of the tunnel is formed on the inner surface of the cutoff sheet 1. In this case, the portion between the side edges of the cutoff sheet 1 near the tunnel ceiling is initially secured to the surface 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mainly applied between a sprayed concrete surface of a ground surface and a lining concrete layer in a tunnel for waterproofing the lining concrete layer at the time of tunnel construction. The present invention relates to a mounting structure and a mounting method of a water stop sheet.

[0002]

2. Description of the Related Art Generally, when constructing a tunnel of this kind, as shown in FIG. 5, a sprayed concrete surface 25 on the ground surface in a tunnel 24 has a predetermined width continuous in an arch shape along the circumferential direction of the tunnel. A large number of waterproof sheets 21 are mounted adjacent to each other in the axial direction of the tunnel. The 23 attachment portions or several attachment portions provided separately are fixed continuously or intermittently by fixing members such as nails and band-shaped pressing members.
Thereafter, a formwork is installed along the inner wall surface of the tunnel, and a lining concrete layer 26 constituting the inner wall of the tunnel is cast between the waterproof sheet 21 provided in the tunnel and the formwork.
The water-stop sheet 21 may be formed by a composite sheet in which a water-impervious layer 23 such as a nonwoven fabric layer or a loop-like raised layer is laminated on a water-impervious sheet 22 made of a soft resin or an elastomer. Can be formed as a single layer.

[0003]

However, in the above-described conventional structure, the space between the two sides of each waterproof sheet 21 has a margin so as to be able to cope with the unevenness of the sprayed concrete surface. Pressure is applied to the left and right wall surfaces by the pressure or the like when the layer 26 is cast, and the vicinity of the top of the tunnel is pulled downward, so that the gap C between the water stop sheet 21 and the vicinity of the ceiling of the sprayed concrete surface 25 is formed. Occurs.
For this reason, there arises a problem that water accumulates here, or a predetermined winding thickness of the lining concrete layer 26 cannot be secured and the structure becomes weak.

The present invention has been made on the basis of the above circumstances, and when spraying a waterproof sheet on a concrete surface, means for preventing dripping of the waterproof sheet in advance near a tunnel ceiling is taken in advance. The object of the present invention is to provide a mounting structure and a mounting method of a waterproof sheet for a tunnel, in which a waterproof sheet is securely held so that no void is generated near a tunnel ceiling portion when casting lining concrete. It is assumed that.

[0005]

Therefore, in the mounting structure of the waterproof sheet for a tunnel according to the present invention, the sprayed concrete surface 5 in the tunnel 4 is clarified as shown in the embodiment shown in FIGS. The water-stop sheet 1 is attached to the (side of the ground) along the circumferential direction of the tunnel, with at least both edges in the axial direction of the tunnel fixed, and the lining concrete forming the inner wall of the tunnel on the outer surface side of the water-stop sheet 1 Layer 6
Is characterized in that a portion between the two side edges near the tunnel ceiling portion of the water-stop sheet 1 is fixed to the sprayed concrete surface 5 side via an attachment member.

In the method of mounting a waterproof sheet for a tunnel according to the present invention, the ground-side sprayed concrete surface in the tunnel 4 is covered by the waterproof sheet 1 along the circumferential direction of the tunnel, and the waterproof sheet 1 in the axial direction of the tunnel. Attached with both side edges of at least the portion between the two side edges near the tunnel ceiling fixed to the sprayed concrete surface,
Thereafter, a lining concrete layer 6 constituting the inner wall of the tunnel is cast and formed on the inner surface side of the waterproof sheet 1.

According to the above-described structure and method, after the waterproof sheet 1 is attached, even if both side walls of the waterproof sheet 1 are pulled downward during the laying of the lining concrete, the tunnel of the waterproof sheet 1 is tunneled. Since the portion between both side edges near the ceiling is fixed in advance to the sprayed concrete surface 5 side via the attachment member, there is no inconvenience that the water stop sheet 1 near the tunnel ceiling is pulled downward.

The water-stop sheet 1 is a composite in which a water-blocking sheet 3 made of a soft synthetic resin or an elastomer or the like and a water-permeable buffer layer 3 made of a non-woven fabric layer or a loop-like raised layer are laminated on the sprayed concrete surface side. It can be a structure, or can be a single-layer structure of only a water-impervious sheet.

As shown in the first embodiment of FIGS. 1 to 3, the mounting member is fixed to the sprayed concrete surface 5 side by a mounting member main body 7 and a mounting member from the outer surface side of the waterproof sheet 1. It can be formed by a clip 8 that engages with the main body 7 and couples and fixes the waterproof sheet 1 to the mounting member main body 7. The clip 8 may be formed of an elastic member such as plastic, or may be formed of a metal member and coupled to the mounting member body 7 by plastic deformation.

[0010] With the above-described configuration of the mounting member,
It can be attached to the water-stop sheet 1 without making a hole, and there is no inconvenience of leaking water from the attached portion. Further, the clip 8 is formed of an elastic member and is elastically engaged, so that the work of attaching and engaging the water-stop sheet 1 is easy and efficient. In addition, the clip 8 is formed of a metal member that is easily plastically deformed, and is plastically deformed and fixedly engaged with a tool such as pliers on the spot, thereby securely and firmly attaching and engaging the waterstop sheet 1.

As shown in a second embodiment in FIG. 4, the mounting member comprises a mounting member 10 made of a surface fastener mounted on the sprayed concrete surface 5 side. The water-stop sheet 1 is engaged and fixed to the opposing surface of the water-permeable buffer layer 3, or the mounting member 10 made of the surface fastener is engaged with the other surface fastener attached to the opposing surface of the water-stop sheet 1. Can be fixed.

[0012] By making the mounting member have the above configuration,
It can be attached to the water-stop sheet 1 without making a hole, and there is no inconvenience of leaking water from the attached portion. Further, in the configuration in which the water-permeable buffer layer 3 of the water-stop sheet 1 is used as the other surface fastener, the degree of freedom of the positional relationship between the water-stop sheet 1 and the mounting member 10 made of the surface fastener is increased, and the water-stop sheet 1 By pressing the corresponding portion from below (from the inside of the tunnel), the water stop sheet 1 can be easily attached and engaged.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Embodiment 1 of a mounting structure and a mounting method of a waterproof sheet for tunnel according to the present invention will be specifically described below with reference to FIGS. As shown in the figure, the mounting structure and the mounting method are basically such that a water-permeable buffer layer made of a brushed layer such as a loop or a nonwoven fabric layer is formed on a water-impervious sheet 2 made of a soft synthetic resin or an elastomer. 3 (these are integrated,
Or as separate sheets)
The waterproof sheet 1 is mounted on the sprayed concrete surface 5 of the surface of the ground in the tunnel 4 with the water buffer layer 3 side as the ground side, and the waterproof sheet 2
A lining concrete layer 6 is formed on the side. In addition, it is also possible to use a single-layer sheet of only the water-blocking sheet as the water-stop sheet 1.

The water-stop sheet 1 is mounted in an arch shape along the circumferential direction of the tunnel, and a number of water-stop sheets 1 are mounted in the tunnel axial direction such that both side edges are adjacent or overlapped, and are spread on the ground surface. At this time, the mounting portions of the water-permeable buffer layers on both side edges are fixed continuously or intermittently by a known means such as tacking or nailing at two or three places via a band-like holding tool or the like. .

In the first embodiment, when the waterproof sheet 1 is extended, at least the range of the top of the tunnel ceiling is 120 degrees (the center line CL of the tunnel and the spring line SL).
Between the two side edges of the water-stop sheet 1 through the attachment member body 7 extending in the longitudinal direction of the tunnel at a required interval in the circumferential direction of the tunnel at an angle of 60 degrees upward and left about the intersection with The connection between the sprayed concrete surface 5 and the waterproof sheet 1 is established. The attachment member main body 7 is a rod-shaped member, for example, a pipe-shaped member, and is attached to the sprayed concrete surface 5 in advance in the longitudinal direction of the tunnel by an attachment 9 such as a concrete nail. The mounting member body 7 may be a member having a short shape.

The water-stop sheet 1 is engaged with the mounting member main body 7 from the water-impervious sheet 2 side through the (water-stop sheet 1 itself), for example, a clip 8 having a C-shaped cross section.
, And is fixedly engaged with the mounting member body 7. After the mounting is completed in this manner, the lining concrete layer 6 is cast in a form along the inner wall surface of the tunnel as usual. The clip 8 has a substantially C-shaped cross-sectional shape that elastically fits over the rod-shaped mounting member main body 7, and may be a cassette-shaped long split tube shape or a short shape made of a wire or a thin plate. In the case of a short shape, a plurality of clips 8 are preferably engaged with one attachment member main body 7 to engage and fix the waterproof sheet 1. Further, the clip 8 can be formed of a metal plate or a wire that can be easily bent plastically, and can be deformed and fixed in place using tools such as pliers. Alternatively, a clip 8 of a washing scissors type can be used.

Therefore, when the lining concrete layer 6 is cast,
Since the vicinity of the top of the water-stop sheet 1 is securely held on the ground surface side by the engagement and fixing action of the attachment member body 7 and the clip 8, it is not pulled downward, there is no obstacle such as water pool, and the lining concrete layer Can be secured.

(Embodiment 2) As shown in Embodiment 2 of FIG. 4, the mounting member of the water-stop sheet 1 is a mounting member 10 made of a surface fastener fixed to the sprayed concrete surface 5 side. The water blocking sheet 3 of the water blocking sheet 1 corresponding to this may be constituted. If the water-stop sheet 1 is a single layer, or the engagement between the water-permeable buffer layer and the hook-and-loop fastener member is difficult or unstable, the other surface fastener may be separately attached to the corresponding surface of the water-stop sheet 1. it can. An attachment member 10 made of a hook-and-loop fastener is used to fix a fixture 11 such as a nail.
Or an adhesive may be used.

As a result, as in the case of the first embodiment described above, the water-stop sheet 1 is securely held on the ground surface side by the action of the attachment member 10 made of a hook-and-loop fastener, so that it is not pulled downward. In addition, the design thickness of the lining concrete layer can be secured.

[0020]

The present invention has been described in detail above. During the construction of lining concrete, the space between the left and right edges near the top of the waterproof sheet is securely held on the ground surface side and pulled downward. Therefore, an excellent effect that the design winding thickness of the lining concrete layer can be secured can be obtained.

Further, the water-stop sheet and the ground side are joined to the mounting member body fixed in advance to the ground-side sprayed concrete surface by engaging and fixing the water-stop sheet from outside of the water-stop sheet with a clip. Or by attaching and engaging the water-permeable buffer layer on the back surface of the water-stop sheet or the other surface fastener to an attachment member consisting of a surface fastener previously fixed to the sprayed concrete surface, for connection to the water-stop sheet. The holes are not made clear and do not adversely affect the water stopping function.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a tunnel according to a first embodiment of the present invention.

FIG. 2 is also a front sectional view.

FIG. 3 is an enlarged cross-sectional view of a main part.

FIG. 4 is an enlarged cross-sectional view of a main part according to the second embodiment.

FIG. 5 is a front sectional view of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water-stop sheet 2 water-blocking sheet 3 water-permeable buffer layer 4 tunnel 5 sprayed concrete surface 6 lining concrete layer 7 mounting member body 8 clip 9 mounting tool 10 mounting member made of surface fastener 11 fixing tool

Claims (5)

[Claims] 1. A water-stop sheet is attached to a sprayed concrete surface in a tunnel along a circumferential direction of the tunnel with at least both edges in the axial direction of the tunnel fixed, and a tunnel inner wall is formed on an inner surface side of the water-stop sheet. A structure in which a lining concrete layer is formed, wherein a portion between the two side edges near the tunnel ceiling portion of the waterproof sheet is fixed to the sprayed concrete surface side via an attachment member. Mounting structure for waterproofing sheet. 2. The water-stop sheet has a structure in which a water-blocking sheet made of a soft synthetic resin or an elastomer is formed on the sprayed concrete surface side and a water-permeable buffer layer made of a nonwoven fabric layer or a loop-like brushed layer is laminated. The structure for mounting a waterproof sheet for a tunnel according to claim 1, wherein: 3. The mounting member includes a mounting member main body fixed to the sprayed concrete surface and a clip that engages with the mounting member main body from the inner surface side of the water-stop sheet to engage and fix the water-stop sheet. The mounting structure for a waterproof sheet for a tunnel according to claim 1, wherein the mounting structure is formed. 4. The mounting member includes a mounting member made of a surface fastener mounted on the sprayed concrete surface, and the mounting member is engaged with and fixed to an opposing surface of a water-permeable buffer layer of the water-stop sheet. The mounting member comprising the hook-and-loop fastener is engaged and fixed with the other hook-and-loop fastener attached to the facing surface of the water-stop sheet.
Or the mounting structure of the waterproof sheet for tunnels as described in 2. 5. A concrete surface sprayed on the ground side in the tunnel is covered with a waterproof sheet along the circumferential direction of the tunnel, and a portion between both side edges of the waterproof sheet in the axial direction of the tunnel and at least the both edges near the tunnel ceiling. Is fixed to the sprayed concrete surface, and thereafter, a lining concrete layer constituting an inner wall of the tunnel is cast and formed on the inner surface side of the waterproof sheet. Mounting method.