JP2517971B2 - Waterproof sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention is particularly applicable to a case where the spring water from the side of the primary lining concrete is secondary-covered by being disposed between the primary lining concrete and the secondary lining concrete of the tunnel. The present invention relates to a waterproof sheet used for preventing water leakage to the concrete side.

Problems to be Solved by Conventional Techniques and Inventions Conventionally, as seen in the NATM method, a waterproof sheet is interposed between the primary lining concrete and secondary lining concrete of the tunnel, and the primary lining concrete side The spring water (spring water from the ground into the tunnel) is prevented from leaking to the secondary lining concrete side. The waterproof sheet used for this purpose is shown in Fig. 4. As described above, it is known that a water-permeable sheet b having a cushioning property, such as a non-woven fabric, is attached to a water-impermeable base sheet a (Jitsuko Sho 51-3).
7844 bulletin). In this waterproof sheet, the water permeable sheet b is arranged on the primary lining concrete side, and the spring water from the primary lining concrete side is made to flow down into the water permeable sheet b. When used in a tunnel for a long period of time in a certain area, the sediment contained in the spring water accumulates in the water permeable sheet b and blocks the spring passage, which reduces the water permeability and waterproof performance. However, it has a problem that it cannot be used permanently for a long period of time.

Further, as shown in FIG. 5, a waterproof sheet having increased water permeability by partially adhering a water permeable sheet b such as a nonwoven fabric to a water impermeable sheet a at a plurality of locations c has been proposed. There is (Kaikai Sho 59-5700, etc.). However, similarly to the above, this waterproof sheet may also deteriorate in water permeability and waterproof performance after long-term use in a place where there is a lot of spring water.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a waterproof sheet that does not get clogged with earth and sand even if it is used for many years and has good running water performance.

Means for Solving the Problems That is, the present invention has a thickness of 0.5
A number of linear bodies of ~ 3 mm intersect each other and irregularly change direction in the horizontal direction and the thickness direction and extend from one to the other, and these continuous linear bodies have at least one line at each intersection. Forming a sheet-like net having a wavy unevenness adhered to each other at a portion thereof, a mesh size of 0.1 to 20 mm, and a sheet height of 1 to 30 mm. It is configured to be laminated on at least a part of one surface of the water-permeable sheet. The size of the mesh referred to in the present invention indicates the maximum distance between two adjacent linear bodies. Since two adjacent linear bodies form a plane or a three-dimensional space, the distance is perpendicular to an arbitrary point on one linear body and a tangent at that point, and the plane including the point and another line. It is the straight line distance to the point where the shape intersects.

Effect According to the waterproof sheet of the present invention, as described above, the water-impermeable sheet is composed of a large number of linear bodies having a thickness of 0.5 to 3 mm, and the size of the mesh is relatively large as 0.1 to 20 mm. Since a special sheet-like net-like body having irregularities and a sheet height of 1 to 30 mm is laminated, for example, this waterproof sheet is used between the primary lining concrete and the secondary lining concrete for tunnel construction as described above. When the reticulated body is placed on the primary lining concrete side and stretched, the spring water from the primary lining concrete side flows down through this reticulated body (void portion of the reticulated body) and is discharged to the outside, At this time, even if a large amount of earth and sand is contained in the spring water, the mesh body is unlikely to be clogged with this earth and sand, and the spring passage is reliably secured, so that the spring water is always guided and discharged outside. The earth and sand are also discharged together with the spring water. Therefore, even if it is used for a long period of time, it exhibits excellent running water performance and enables permanent use.

An embodiment of the present invention will be described below with reference to FIGS.

Example FIG. 1 shows a waterproof sheet according to an example of the present invention. The waterproof sheet 1 is formed by laminating a sheet-like net-like body 3 having undulating irregularities on one surface of a water-impermeable sheet 2. It is a thing.

Here, the impermeable sheet 2 is preferably a synthetic resin sheet such as polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, and has a thickness of 0.3. It is preferable to set it to ˜6 mm.

The sheet-like mesh 3 is made of polyamide, polyester or polyethylene, as shown in FIGS.
A thin wire of synthetic resin such as polyolefin such as polypropylene, a metal wire coated with a synthetic resin such as polyvinyl chloride, or a large number of linear bodies 4 such as a metal wire intersects each other and is irregular in the horizontal direction and the thickness direction. It extends from one direction to the other by changing the direction, and is formed by a net-like sheet having waviness-like irregularities in which a large number of these continuous linear bodies are adhered to each other at least at some intersections. It retains the shape and has rigidity.

In this case, the linear body 4 that constitutes the sheet-like net body 3
Has a thickness of 0.5 to 3 mm, and the size of the mesh 7 of the sheet-like mesh body 3 is 0.1 to 20 mm, and particularly preferably 1 to 10 mm. Further, 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 lower side is 1 to 30 mm, and particularly preferably 2 to 10 mm. Is.

It should be noted that the lamination mode of the water-impermeable sheet 2 and the mesh 3 can be appropriately selected, and the mesh 3 may be laminated on the entire one surface of the water-impermeable sheet 2, or one surface of the water-impermeable sheet 2. Alternatively, the mesh body 3 may be partially laminated. The water-impermeable sheet and the mesh may be adhered over the entire surface, but in order to improve the workability and handleability of the waterproof sheet, they are partially joined and integrated with an adhesive or the like. Good.

When the waterproof sheet 1 shown in FIG. 1 is stretched between the primary lining concrete and the secondary lining concrete of a tunnel, for example, the impermeable sheet 2 is placed on the side of the secondary lining concrete and the mesh body 3 is provided. Is arranged on the side of the primary lining concrete, whereby the mesh body 3 is formed as a water conduit. According to this waterproof sheet 1, the net-like body 3 forming the water conduit extends from one side to the other side while changing the direction in the horizontal direction and the thickness direction irregularly while a large number of linear bodies intersect with each other. Since the large number of continuous linear bodies is a sheet body having a relatively large mesh having wavy irregularities that are bonded to each other at at least a portion at each intersection, the spring water flowing inside (the voids of the mesh body) is Even if it involves a considerable amount of sediment, it can be discharged together with spring water without causing clogging by sediment. Further, in this case, since the reticulate body 3 has good shape-retaining property and rigidity, the reticulated body 3 is not crushed even when pressure is applied by the secondary lining concrete and the mesh is not reduced. Ensure water permeability.

Therefore, this waterproof sheet exhibits excellent water-passing performance for a long period of time.

Note that the present invention is not limited to the above-described embodiments, for example, a water-impermeable sheet having a large number of ridges formed on one side thereof, or a wavy layered mesh body, Various changes can be made within the scope of the present invention.

As described above, according to the waterproof sheet of the present invention,
A large number of linear bodies with a thickness of 0.5 to 3 mm extend in a horizontal direction and in a thickness direction from one direction to the other while intersecting each other, and extend from one to the other. A sheet-like net-like body having a wavy unevenness that is adhered to each other at least at a portion at an intersection, and the size of the mesh is 0.1 to 20 mm and the sheet height is 1 to 30 mm. By stacking on at least a part of it, drainage with a lot of earth and sand can be reliably discharged without clogging, good running performance over a long period of time is ensured, and it is possible to use it permanently. Therefore, it is suitably used as a waterproof sheet for civil engineering works such as tunnels.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of the present invention, FIG.
The figure is a partially omitted enlarged plan view of the reticulate body used in the same example, FIG. 3 is a partially omitted enlarged side view of the reticulated body, and FIGS. 4 and 5 are partially omitted cross-sectional views showing a conventional waterproof sheet, respectively. is there. 1 ... waterproof sheet, 2 ... impermeable sheet, 3 ... mesh, 4 ... linear body, 5 ... intersection, 6 ... waviness unevenness, 7 ... mesh.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Kazuo Yagi 12-23 Miyamachi, Izumiotsu City Tanaka Co., Ltd. (72) Tomoyuki Miyagawa 877 Komiya, Harima-cho, Kako-gun, Hyogo Daiwa Spinning Co., Ltd. ) References Jitsuko Sho 51-37844 (JP, Y2)

Claims (1)

(57) [Claims] 1. A large number of continuous wires having a thickness of 0.5 to 3 mm, which intersect with each other and irregularly change directions in the horizontal direction and the thickness direction and extend from one to the other. The shape has wavy unevenness that is adhered to each other at least partially at each intersection, and the size of the mesh is
A sheet-like mesh body having a sheet height of 0.1 to 20 mm and a sheet height of 1 to 30 mm is formed, and the mesh body is laminated on at least a part of one surface of the impermeable sheet. Tarpaulin.