JPS63315800A - 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 The present invention is particularly advantageous in that a tunnel is provided between secondary lining concrete and spring water from the secondary lining concrete side to the secondary lining concrete side. This invention relates to a waterproof sheet used to prevent water from leaking into the water.

Traditionally, NA
As seen in the TM construction method, a waterproof sheet is interposed between the secondary lining concrete and the secondary lining concrete of the tunnel, and - spring water from the lining concrete side (from underground into the tunnel) is interposed between the secondary lining concrete and the secondary lining concrete. Spring water) is being prevented from leaking into the secondary lining concrete side, and the waterproof sheet used for this purpose is a non-woven fabric on an impermeable base sheet a, as shown in Figure 4. It is known that a water-permeable sheet b having cushioning properties such as
Publication No. 44). In this waterproof sheet, a water permeable sheet b is placed on the secondary lining concrete side so that spring water from the lining concrete side flows down into this 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 permeability is increased by partially adhering a water permeable sheet b such as a nonwoven fabric to a water impermeable sheet a at multiple locations, thereby increasing 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 developed in view of the above circumstances, and has no clogging with earth and sand even after long-term use, maintains good water flow performance, and has an excellent buffering effect against protrusions during tunnel construction. The purpose is to provide waterproof sheets.

Dish yμL1 shinp] - [Dasai! However, 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 each other and changing directions irregularly in the horizontal direction and the thickness direction. The continuous linear bodies form a sheet-like network having undulations and convexities that are adhered to each other at least in part at each intersection, and the network is laminated on at least a part of one surface of the cushioning sheet. , a water-impermeable sheet is laminated on the other surface of the cushioning sheet.

Here, as for the sheet-like net-like body, the thickness of the linear body is 0.
5 to 3 mm, and the mesh size of the sheet-like mesh body is 0.
．． 1 to 20 no., and the height of the sheet-like network is 1 to 301 m. 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.

Further, as the cushioning sheet, a water-permeable sheet such as a nonwoven fabric is preferably used.

According to the waterproof sheet of the present invention, the water-impermeable sheet, the cushioning sheet, and the above-mentioned special sheet-like mesh body having relatively large mesh undulations and recesses are laminated in sequence. When a waterproof sheet is stretched between the primary lining concrete and secondary lining concrete of tunnel construction, with the above net-like body placed on the primary lining concrete side, the spring water from the lining concrete side will be It flows down through the reticulated body (the voids in the reticulated body) and is discharged to the outside.At this time, even if the spring water contains a large amount of sediment, the reticulated body is not easily clogged with this sediment, and the spring water is Since the passage is reliably secured, the spring water is always reliably guided and discharged to the outside, and the 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.

In addition, by installing a cushioning sheet, it exhibits an excellent cushioning effect against protrusions such as reinforcing bars and bolts during tunnel construction. The water-impermeable sheet is protected by the sheet, preventing damage to the water-impermeable sheet, and ensuring the original function of the waterproof sheet.

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, and this waterproof sheet 1 includes a water-impermeable sheet 2, a cushioning sheet 3 on one side, and a sheet-like mesh body having undulating irregularities on one side. 4 is laminated.

Here, as the water-impermeable sheet 2, polyvinyl chloride,
Synthetic resin sheets such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, etc. are suitable, and the thickness thereof is 0.3 to 6 IIn.
It is preferable that

Further, as the cushioning sheet 3, a woven fabric or a nonwoven fabric having a thickness of about 2 to 10 rm, particularly a nonwoven fabric made of synthetic resin such as polyethylene, polypropylene, polyester, or nylon, is preferably used.

Furthermore, as shown in FIGS. 2 and 3, the sheet-like network body 4 is made of a thin synthetic resin wire made of polyamide, polyester, or polyolefin such as polyethylene or polypropylene, or a metal wire coated with a synthetic resin such as polyvinyl chloride. , or a large number of linear bodies 5 such as metal wires extend from one side to the other while intersecting each other while changing directions irregularly in the horizontal direction and the thickness direction, and these many continuous linear bodies 5 cross each other. It is formed into a net-like sheet having undulating concavities and convexities that are bonded to each other in at least some parts, and has shape retention and rigidity to maintain this shape.

In this case, the thickness of the linear bodies 5 constituting the sheet-like net-like body 4 is preferably 0.5 to 3 m, and the size of the meshes 8 of the sheet-like net-like body 4 is 0.1 to 3 m. The length is preferably 20 m, particularly 1 to 101 m. Furthermore, the height h of the sheet-like mesh body 4, that is, the distance between the top of the highest 6x undulations on the upper side and the top of the highest undulations on the bottom side is 1 to 30n.
n+, particularly preferably 2 to 10 mm.

Note that the lamination mode of the water-impermeable sheet 2 and the cushioning sheet 3 and the cushioning sheet 3 and the net-like body 4 can be selected as appropriate. The sheets 3 or the mesh body 4 may be laminated,
Further, the cushioning sheet 3 or the mesh body 4 may be partially laminated on one surface of the water-impermeable sheet 2 or the cushioning sheet 3, respectively.

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. Further, the water-impermeable sheet 2 and the cushioning sheet 3 are also fully or partially adhered by an appropriate method.

For example, when the waterproof sheet 1 shown in FIG. is placed on the secondary lining concrete side, thereby forming the net-like body 4 as a water conduit. According to this waterproof sheet 1, the net-like body 4 forming the water conduit is as follows.

A large number of linear bodies intersect with each other and extend from one side to the other while changing direction irregularly in the horizontal and thickness directions, and these many continuous linear bodies intersect with each other at least in part at each intersection. Since it is a relatively large mesh sheet with bonded undulating irregularities, even if the spring water flowing inside the mesh (in the voids of the mesh) is accompanied by a considerable amount of sediment, it will not become clogged with sediment. This allows sediment to be discharged together with spring water without any formation. Moreover, in this case, since the mesh body 4 has good shape retention and rigidity,
Even when pressure is applied by placing secondary lining concrete, the mesh does not collapse or shrink, ensuring good water permeability.

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

Moreover, the buffering effect of the cushioning sheet 3 against the protrusions prevents the water-impermeable sheet 2 from being damaged by the protrusions, so the waterproof function of the water-impermeable sheet 2 is not damaged and its function is ensured. Demonstrate.

Note that the present invention is not limited to the above-described embodiments; for example, a water-impermeable sheet with many protrusions formed on one side may be used, or a cushioning sheet or a net-like material may be laminated in a wavy manner. As explained above, according to the waterproof sheet of the present invention, a large number of linear bodies intersect with each other and A sheet-like net-like body that extends from one side to the other while changing directions irregularly in the horizontal direction and the thickness direction, and has undulations and convexities in which a large number of continuous linear bodies are bonded to each other at least in part at each intersection. By laminating the mesh on at least a part of one side of the cushioning sheet and laminating an impermeable sheet on the other side of the cushioning sheet, drainage with a lot of earth and sand can be avoided. Water can be discharged reliably without clogging, ensuring good water flow performance over a long period of time, and the buffering effect of the cushioning sheet ensures that the impermeable sheet is protected against protrusions during tunnel construction. , which enables permanent use, and is therefore suitable for use as a waterproof sheet for civil engineering works such as tunnels.

[Brief explanation of drawings]

FIG. 1 is a partially omitted sectional view showing one embodiment of the present invention, and FIG.
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...
- Cushioning sheet, 4... Reticular body, 5... Linear body, 6
...Intersection, 7...undulation-like unevenness, 8...mesh. Agent: Patent Attorney Takashi Kojima Figure 1, Figure 2,

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 sheet-like network body having undulating irregularities that are mutually adhered at least in part at intersections is formed, and the network body is laminated on at least a part of one side of the cushioning sheet, and the other side of the cushioning sheet is laminated. A waterproof sheet characterized by being made by laminating a water-impermeable sheet on its surface. 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.