JPS63315799A - Waterproof sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is particularly applicable to tunnels that are installed between the primary lining concrete and the secondary lining concrete of a tunnel so that spring water from the secondary lining concrete side flows into the secondary lining concrete. This invention relates to a waterproof sheet used to prevent water from leaking into concrete.

The next day is about to begin - Conventionally, NA
As seen in the TM construction method, a waterproof sheet is interposed between the primary lining concrete and secondary lining concrete of the tunnel, and - spring water from the lining concrete side (spring from underground into the tunnel) is interposed between the primary lining concrete and secondary lining concrete of the tunnel. Water) is used to prevent water from leaking into the secondary lining concrete side, and as shown in Figure 4, a waterproof sheet used for this purpose is a non-woven fabric on an impermeable base sheet a. A sheet laminated with a water-permeable sheet b having a cushioning property of
Publication No. 44). In this waterproof sheet, a water-permeable sheet b is placed on the secondary lining concrete side, and spring water from the water-permeable concrete side flows down into the water-permeable sheet b. If used in a tunnel for a long period of time in a place where there is spring water, the earth and sand contained in the spring water will accumulate in the water-permeable sheet b and block the spring water passage, resulting in a decrease in water permeability and waterproof performance. Therefore, there is a problem that it cannot be used permanently for a long period of time.

Furthermore, as shown in Fig. 5, a waterproof sheet has been proposed in which water-permeable sheet b such as non-woven fabric is partially bonded to a water-impermeable sheet a at multiple locations to increase water permeability and improve water permeability. (Utility Model Application Publication No. 59-5700, etc.).

However, similarly to the above, there is a risk that the water permeability and waterproof performance of this waterproof sheet may deteriorate over a long period of use in areas where there is a lot of spring water.

The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a waterproof sheet that does not become clogged with earth and sand and maintains good water flow performance even after long-term use.

In order to achieve the above object, the present invention has a large number of linear bodies extending from one side to the other while intersecting with each other and irregularly changing directions in the horizontal direction and the thickness direction. , a large number of continuous linear bodies form a sheet-like network having undulating irregularities that are bonded to each other at least in part at each intersection, and the network forms at least a part of one surface of the water-impermeable sheet. It is constructed so that it is laminated in layers.

Here, as for the sheet-like net-like body, the thickness of the linear body is 0.
5 to 3 m, and the mesh size of the sheet-like mesh body is 0.
1 to 201 m, and the height of the sheet-like network is 1 to 201 m.
~30+nm is preferably used. Note that the mesh size in the present invention refers to the maximum distance between two adjacent linear bodies. Since two adjacent linear bodies form a plane or three-dimensional space, the distance between them is perpendicular to any point on one linear body and the tangent at that point, and between the plane containing that point and the other line. This is the straight line distance from the point where the two objects intersect.

Soil 1 According to the waterproof sheet of the present invention, since the above-mentioned special sheet-like mesh body having relatively large mesh undulations and convexities is laminated on the impermeable sheet, this waterproof sheet can be used, for example, in tunnel construction. When the above-mentioned net is placed on the primary lining concrete side and stretched between the primary lining concrete and the secondary lining concrete, the spring water from the lining concrete side will flow inside this net (on the net lining). The water flows down through the voids) and is discharged to the outside, but even if the spring water contains a large amount of sediment, the mesh will become clogged with the sediment, ensuring a clear path for the spring water. As a result, spring water is always reliably guided and discharged to the outside, and earth and sand are also discharged together with the spring water. Therefore, even when used for a long period of time, it exhibits excellent water flow performance and can be used permanently.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a waterproof sheet according to an embodiment of the present invention. This waterproof sheet 1 is made by laminating a sheet-like mesh body 3 having undulations and projections on one side of a water-impermeable sheet 2. It is what it is.

Here, as the water-impermeable sheet 2, polyvinyl chloride,
A synthetic resin sheet such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, or the like is suitable, and the thickness thereof is preferably 0.3 to 6 mm.

Further, the sheet-like network body 3 may be made of polyamide, polyester, polyethylene, etc., as shown in FIGS.
A large number of thin wires made of synthetic resin such as polyolefin such as polypropylene, metal wires coated with synthetic resin such as polyvinyl chloride, or wire bodies 4 such as metal wires intersect each other irregularly in the horizontal direction and the thickness direction. It is formed into a net-like sheet having undulations and convexities that extend from one side to the other while changing directions, and a large number of these continuous linear bodies are bonded to each other at least in part at each intersection, and such a shape It has shape retention and rigidity to maintain.

In this case, it is preferable that the thickness of the linear bodies 4 constituting the sheet-like net-like body 3 is 0.5 to 3 m, and the size of the meshes 7 of the sheet-like net-like body 3 is 0.1 to 3 m. 20+nm,
In particular, it is preferable to set it to 1-10 rm. Furthermore, the height h of the sheet-like mesh body 3, that is, the distance between the top of the highest undulation on the upper side and the top of the highest undulation on the bottom side, is 1 to 3.
0 mm, particularly preferably 2 to 10 mm.

Note that the manner in which the water-impermeable sheet 2 and the net-like body 3 are laminated can be selected as appropriate. The net-like body 3 may be partially laminated on. In addition, although the impermeable sheet and the net-like body may be glued together over the entire surface, in order to improve the workability and handling of the waterproof sheet, it is preferable to partially join them together with an adhesive or the like to integrate them. Good too.

For example, when the waterproof sheet 1 shown in FIG. is placed on the primary encasing concrete side, thereby forming the net-like body 3 as a water conduit. According to this waterproof sheet 1, the net-like body 3 forming the water conduit has a large number of linear bodies that extend from one side to the other while changing directions irregularly in the horizontal direction and the thickness direction while intersecting each other. These large numbers of continuous linear bodies are relatively mesh-like sheets with undulating concavities and convexities that are bonded to each other at least in part at each intersection, so spring water flowing inside the mesh (in the voids of the network) is Even if a large amount of sediment is involved, the sediment can be discharged together with spring water without causing clogging. In addition, in this case, since the mesh body 3 has good shape retention and rigidity, it will not collapse and the mesh will shrink even if pressure is applied by pouring the secondary lining concrete, and it will have good shape retention and rigidity. Ensure water permeability.

Therefore, this waterproof sheet exhibits excellent water permeability over a long period of time.

Note that the present invention is not limited to the above-mentioned embodiments; for example, a water-impermeable sheet having a large number of protrusions formed on one side may be used, net-like bodies may be laminated in a wavy manner, etc. Various modifications can be made within the scope of the invention.

As explained above, according to the waterproof sheet of the present invention, a large number of linear bodies intersect with each other and change direction irregularly in the horizontal direction and the thickness direction, extending from one side to the other. By laminating a sheet-like mesh body having undulations and convexities in which a large number of continuous linear bodies are bonded to each other at least in part at each intersection on at least a part of one surface of the impermeable sheet, it is possible to reduce the amount of soil and sand. It is a waterproof sheet for civil engineering works such as tunnels because it can reliably discharge large amounts of wastewater without clogging, guarantees good water flow performance over a long period of time, and can be used permanently. It is suitably used as

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partially omitted cross-sectional view showing one embodiment of the present invention;
The figure is a partially omitted enlarged plan view of the net-like body used on the same side, Figure 3 is a partially omitted enlarged side view of the same net-like body, and Figures 4 and 5 are partially omitted cross-sectional views showing conventional waterproof sheets. be. 1... Waterproof sheet, 2... Water impermeable sheet, 3...
・Reticular body, 4... Linear body, 5... Intersection, 6...
Wave-like unevenness, 7...mesh.

Claims (1)

[Claims] 1. A large number of linear bodies intersect with each other and extend from one side to the other while changing directions irregularly in the horizontal direction and the thickness direction, and each of these continuous linear bodies A waterproofing product characterized in that it forms a sheet-like net-like body having undulating concavities and convexities that are bonded to each other at least in part at intersections, and that the net-like body is laminated on at least a part of one surface of an impermeable sheet. sheet. 2. The thickness of the linear body is 0.5 to 3 mm, the mesh size of the sheet-like network is 0.1 to 20 mm, and the height of the sheet-like network is 1 to 30 mm. A waterproof sheet according to claim 1.