JP3533535B2 - Tunnel waterproofing construction method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel waterproofing method in which a primary lining surface of a tunnel is covered with a flat waterproof sheet with a water-permeable sheet such as a nonwoven fabric interposed therebetween. In such a tunnel waterproofing construction, a water-permeable sheet and a flat waterproof sheet are interposed between the primary lining and the secondary lining of the tunnel, and these linings are separated from each other to form a secondary lining. Prevents concrete from cracking, water-permeable sheet protects the tarpaulin, and the tarpaulin plays the role of preventing leak of water from tunnel spring. [0003] According to the conventional method of waterproofing tunnels of the above-mentioned type, if there is a break in the waterproof sheet, even if the spring area of the ground is far from the damaged place, the waterproof sheet can be used. Water could leak from the damaged part. This is because the permeable sheet contains the spring of the ground and diffuses it to the four sides of the primary lining surface. This tendency becomes stronger when the water-permeable sheet is a nonwoven fabric. The nonwoven fabric has a water permeability in the cloth surface direction that is about 10 times higher than the water permeability in the thickness direction. The above-mentioned water leakage problem is called a corrugated sheet in which ribs are formed on one side in parallel, and a conventional waterproof sheet stretched on the primary lining surface alone is used instead of the flat waterproof sheet. Is not resolved.
The ribs of the corrugated sheet, that is, the corrugated ribs, have a height of about 1.5 to 2.5 mm, and when a parallel body of the ribs is covered with a water-permeable sheet such as a nonwoven fabric, the grooves formed by the parallel arrangement of the ribs become water-permeable. The sheet substantially disappears because of the sheet, and the result is similar to that of the flat sheet. Even if the groove is left as a drainage space on the back surface of the waterproof sheet by some means, the water leakage is not eliminated. With the corrugated type, the drainage space spreads over the entire back of the tarpaulin. This means that when the primary lining surface is covered with the waterproof sheet under the interposition of the water-permeable sheet, the entire back surface of the waterproof sheet substantially becomes a water path. Therefore, the water path in the drainage space has little effect on the above-described countermeasures against water leakage. SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof construction for a tunnel in which the primary lining surface of a tunnel is covered with a flat waterproof sheet under the intervention of a water-permeable sheet. The purpose is to prevent the aforementioned leaks caused by the diffusion. Another object of the present invention is to provide excellent workability in waterproofing a tunnel of the above-mentioned type. [0008] A method according to the present invention is a tunnel waterproofing method for covering a primary lining surface of a tunnel with a flat waterproof sheet with a water-permeable sheet interposed therebetween. A flexible sheet attached to one side under the mode in which the flexible striations are spaced apart and arranged in parallel, so that the striations extend in the tunnel transverse direction inside the tunnel pit, and on the primary lining surface of the tunnel. It is characterized by the fact that a flat tarpaulin is stretched over it. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings showing an embodiment of the present invention,
The present invention will be described. The present invention relates to a method for producing a primary sheet of a tunnel under the intervention of a water-permeable sheet 11 such as a non-woven fabric (hereinafter referred to as a “non-woven cloth”, except for the “Effects of the Invention”). It is intended for tunnel waterproofing of a style in which the lining surface L is covered with a flat waterproof sheet 12. In order to carry out this type of tunnel waterproofing, in a related invention other than the present invention, a coil spring-like helical flexible strip 2 is inserted between the nonwoven fabric 11 and the flat waterproof sheet 12. A method is adopted in which the wires 2 extend in the transverse direction of the tunnel and are interposed in such a manner that they are arranged side by side at a distance in the tunnel length direction (this method is referred to as specification (I)). Alternatively, in order to perform the waterproofing, the invention of the present application
In another related invention, the non-woven fabric 1 has a coil spring-like helical, flexible strip 2 interposed therebetween in a spaced-apart and parallel manner.
A method of stretching the sheet waterproofing material 1 made of a laminate of the flat waterproofing sheet 1 and the flat waterproofing sheet 12 on the primary lining surface L of the tunnel in the following manner a (this method is referred to as specification (II)). A. When the sheet waterproofing material 1 is stretched on the primary lining surface, the extending direction of the striations 2 is oriented in the transverse direction of the tunnel, and the flat waterproof sheet 12 is located inside the tunnel pit. In order to perform the waterproofing work, in the present invention, a non-woven fabric 11 having a coil spring-like helical shape and flexible strips 2 attached to one side in a spaced-apart manner in parallel with each other in a tunnel primary manner as shown in b below. After stretching on the lining surface L, a method of stretching the flat waterproof sheet 12 from above is adopted (this method is described in specification (II
I)). B. When the nonwoven fabric 11 is stretched on the primary lining surface, the striations 2 are directed to extend in the tunnel transverse direction inside the tunnel pit. The method of the specification (I) is not limited, but as a result of the method of the specification (II) or (III), the striations between the nonwoven fabric 11 and the flat waterproof sheet 12 are obtained.
May be interposed in the above-described predetermined mode. FIG. 1 shows the outline of the tunnel waterproofing work according to the specifications (I), (II) and (III). FIG. 1 is a cross-sectional view in the tunnel length direction schematically showing a state in which construction has been completed. In FIG. 1, reference numeral 3 denotes a joint between the nonwoven fabric 11 and the flat waterproof sheet 12. In the illustrated example, the nonwoven fabric 11 and the flat waterproof sheet 12 are heat-fusible, and the joining thereof is heat-fusing according to a conventional method. In the specification (II), the sheet waterproofing material 1 used for the tunnel waterproofing material is shown in FIG. 2 (A), and the coiled spring-like spiral flexible wire 2 is shown in FIG. 2 (B). The tunnel waterproofing material shown in FIG.
1 and the flat waterproof sheet 12, the non-woven fabric 11 and the flat waterproof sheet 12 are interposed in a manner known per se by interposing the coiled spring-like helical flexible strips 2 in parallel and spaced apart from each other. It is joined. It is preferable that the strips 2 are attached to the nonwoven fabric 11 under the predetermined parallel mode, and a flat waterproof sheet 12 is joined to the nonwoven fabric 11 from above, so that the flat waterproof sheet 12 is interposed therebetween. In order to attach the line 2 to the nonwoven fabric 11, sewing may be performed by sewing, and the sewing is sufficient at some places. The coil spring-like helical flexible strip 2 can be made of plastic such as polyvinyl chloride or polyethylene. The components of the tunnel waterproof material made of the nonwoven fabric 11 with the coil spring-like helical flexible strip 2 on one side used in the specification (III) are shown in FIG. The attachment of the strips 2 in the element 1 'may be performed in accordance with the method described above. To cover the primary lining surface L of the tunnel with the flat waterproof sheet 12 with the interposition of the nonwoven fabric 11, the nonwoven fabric 11
The coil spring-like spiral strip 2 is interposed in a predetermined manner between the sheet 12 and the sheet 12 so that the strip 2
Accordingly, a drainage space S, that is, a water path, extending in the tunnel transverse direction is formed on the back surface of the flat waterproof sheet 12. Therefore, the water that has flowed out from the ground to the primary lining surface flows through the drainage space S formed by the spiral striations 2 to the drainage pipe at the lower part of the tunnel side wall, or collects at the water collecting work at the invert portion. The drainage space S as the water channel is formed by the inner space of the coil spring-like spiral strip 2 and is separated in the length direction of the tunnel. For this reason, the nonwoven fabric diffuses spring water from the spring location, thereby preventing water from leaking from the waterproof sheet breakage hole at a location distant from the spring location, or at least significantly reducing the tendency of the water to leak. Contribute to If the drainage space as a waterway is separated in the length direction of the tunnel, if water comes to the drainage space before water spreads to the sheet breakage hole at a location away from the spring, And then drained or collected as described above,
Does not spread beyond the same space. In addition, the coil-like helical shape has a sufficiently high water inflow porosity, so that water can flow in very easily. In other words, the drainage space functions to prevent spring water generated at a location away from the sheet break hole from diffusing into the hole. The spiral wire 2 serving as a drainage space generally has a parallel pitch of about 2 to 1 m, preferably about 0.5 to 0.3 m in the case of the specification (II). In the case of III), the parallel pitch is about 2 to 1 m, more preferably 0.5 to 0.3 m, and the spiral inner diameter d of the striations 2 is 5 to 20 mm for both the specifications (II) and (III). The helical strip 2 is made of a flexible material. This is because, in the tunnel waterproofing construction of the type described at the beginning according to the specification (II), good conformability of the sheet waterproofing material 1 to unevenness of the primary lining surface of the tunnel is obtained,
Excellent workability is obtained. In the specification (III), since the nonwoven fabric 11 with the striations 2 and the flat waterproof sheet 12 are separately stretched, the conformability to the irregularities of the primary lining surface is further improved, and the workability is further improved. In addition, a spiral spring-like spiral striation is applied to a member for forming a drainage space on the back of the waterproof sheet, so that the waterproof sheet can be formed by the striation even after the secondary lining concrete is cast. Ensuring that there is drainage space at the back. A tunnel waterproofing material which is a laminated type of a nonwoven fabric 11 and a flat waterproof sheet 12, wherein a coil-like spiral flexible strip 2 is interposed between the nonwoven fabric and the sheet in a spaced-apart manner. by taking the method specifications (II) described above using the same, obtaining applying waterproof Engineering for successful a favorable effect as described above in a simple tunnel primary lining surface. As is apparent from the above description,
The present invention relates to a tunnel waterproofing construction method of the type described at the beginning, in which a water-permeable sheet diffuses spring water, so that water leaks from a waterproof sheet break hole at a location far from the spring location. to prevent, or at least the water leakage tends exhibit the effect of significantly reduced, it is possible to obtain an excellent workability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an outline of a construction mode of a construction method according to the present invention. FIG. 2A is a perspective view showing an example of a tunnel waterproofing material according to a related invention other than the present invention, with a part thereof being cut away, and FIG. FIG. FIG. 3 is a partially cutaway perspective view showing constituent elements of a tunnel waterproofing material used in the method according to the present invention. [Description of Signs] 1 Sheet waterproofing material 1 ′ as waterproofing material for tunnel waterproofing construction 1 ′ Component of tunnel waterproofing material 11 Water permeable sheet 12 Flat waterproofing sheet 2 Coil spring-like helical flexible strip L Primary tunnel lining surface S drainage space

Claims (1)

(57) [Claims 1] In a tunnel waterproofing construction method in which a primary lining surface of a tunnel is covered with a flat waterproof sheet with a water-permeable sheet interposed, a coil spring-like spiral type can be used. A water-permeable sheet attached to one side under the mode in which the flexible striations are separated and arranged in parallel, in such a manner that the striations extend in the tunnel transverse direction inside the tunnel pit, and are stretched on the primary lining surface of the tunnel, Tunnel waterproofing construction method characterized by stretching a flat waterproof sheet from above.