JPS62144940A - 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] Industrial Advantages The present invention is particularly advantageous in that it is provided between the primary lining concrete and the secondary lining concrete of a tunnel so that spring water from the primary lining concrete side flows into the secondary lining concrete. This invention relates to a waterproof sheet used to prevent water from leaking into concrete.

Problems that conventional techniques and inventions try to solve
As seen in the ATM 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 Water) is used to prevent water from leaking into the secondary lining concrete, and as shown in Figure 2, a waterproof sheet used for this purpose is a non-woven fabric or similar material on an impermeable base sheet a. One in which a water-permeable sheet b is laminated is known (Utility Model Publication No. 51-37844).

In this waterproof sheet, a water permeable sheet b is placed on the primary covering concrete side, and spring water from the covering concrete side flows down into the water permeable sheet b, but if there is a large amount of spring water, In some places, when used in a tunnel for a long period of time, the dirt contained in the spring water accumulates in the permeable sheet B, blocking the spring water passage, resulting in a decrease in water permeability and waterproof performance. There is.

In addition, as shown in Figure 3, a waterproof sheet has been proposed in which water permeability is increased by partially adhering a water permeable sheet b to a water impermeable sheet a at multiple locations (C). Publication No. 59-5700, etc.). However, just like the above, this waterproof sheet also has the risk of decreasing its water permeability and waterproof performance over long periods 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 solve the problem, that is, to achieve the above object, the present invention provides a three-dimensional random coil-like rigid rigidity with a relatively large mesh having an internal communication space directly or through a water-permeable sheet in a water-impermeable sheet. The water passing member is at least partially laminated, and the inside of the water passing member serves as a conduit through which spring water flows.

Function: According to the waterproof sheet of the present invention, as described above, a three-dimensional random coil-shaped rigid water-permeable member having an internal communication space and a relatively large mesh is laminated to the water-impermeable sheet. When the sheet is stretched between the primary lining concrete and secondary lining concrete of tunnel construction, with the water-permeable member placed on the primary lining concrete side, -
Spring water from the concrete side flows through the water passage members,
However, even if the spring water contains a considerable amount of sediment,
The water-permeable member has a random coil shape with a relatively large mesh, and is rigid and shape-retaining, so that it is prevented from being crushed as much as possible when the waterproof sheet is stretched, and the mesh is large enough. Since it is retained, the water passing member is not clogged with earth and sand, and the earth and sand are discharged together with the spring water. Therefore, it exhibits excellent water flow performance even after long-term use.

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

FIG. 1 shows a waterproof sheet according to an embodiment of the present invention, and this waterproof sheet 1 has an internal communication space by interposing a water-permeable sheet 3 on one side of a water-impermeable sheet 2. It is formed by partially laminating three-dimensional random coil-shaped rigid water-permeable members 4. In this case, the water-permeable sheet 3 is partially bonded 5 to the water-impermeable sheet 2, and the water-permeable member 4
Both are partially glued 6.

Here, as the water-impermeable sheet 2, polyvinyl chloride,
A synthetic resin sheet such as polyethylene, polypropylene, or ethylene-vinyl acetate copolymer is suitable, and the thickness thereof is preferably 0.3 to 5 mm. The water-permeable sheet 3 may be a woven fabric or non-woven fabric with a thickness of about 2 to 10 mm, especially polyethylene, polypropylene, polyester,
A nonwoven fabric made of synthetic resin such as nylon is preferably used.

The water passing member 4 may be a three-dimensional network with shape retention in the form of a three-dimensional random coil, which is formed by randomly winding a linear body such as a synthetic resin-coated metal wire or a thin hard plastic wire, and has an internal communication space. It is preferable to configure it as follows. In this case, the mesh size of this water-permeable member is 0.1 to 10, particularly 0.5 to 5I, in order to effectively flow down and discharge the earth and sand.
II11 is preferable, and its thickness is 5 to 3
It is preferable to set it as 0m+n.

The waterproof sheet 1 shown in FIG. 4 is placed on the primary encasing concrete side, thereby forming the water passage member 4 as a conduit. According to this waterproof sheet 1, since the water passing member 4 forming the water conduit has a random coil shape and an internal communication space with a relatively large mesh, the spring water flowing inside this space is accompanied by a considerable amount of earth and sand. Even if the drain is wet, the sediment can be discharged together with spring water without causing clogging.

Furthermore, since spring water flows into the water-permeable sheet 3 in addition to the water-permeable member 4, the water retention amount and water permeation amount are further ensured.

In addition, although the above-mentioned example is one in which a water-permeable member is partially laminated on a water-impermeable sheet via a water-permeable sheet, the structure and lamination mode of the waterproof sheet are not limited to the above-mentioned example. Alternatively, the water-permeable member may be laminated directly on the water-impermeable sheet, or the water-permeable member may be laminated over the entire surface of the water-permeable sheet.

Furthermore, in the above embodiments, the water-impermeable sheet and the water-permeable member, or the water-permeable sheet and the water-permeable member are partially adhered to each other, but the water-impermeable sheet, the water-permeable member, and the water-permeable member The manner in which the sheets are fixed is not limited to the above-mentioned embodiments; for example, the sheets may be adhesively bonded on the entire surface or simply laminated in a stacked manner, and other configurations may also be used without departing from the gist of the present invention. Various changes may be made.

As explained above, the waterproof sheet of the present invention includes, at least partially, a three-dimensional random coil-shaped rigid water-permeable member having an internal communication space directly or through a water-permeable sheet on a water-impermeable sheet. By laminating the sheets, it is possible to reliably discharge wastewater containing a lot of earth and sand without clogging, ensuring good water flow performance over a long period of time, making it suitable as a waterproof sheet for civil engineering works such as tunnels. used.

[Brief explanation of drawings]

FIG. 1 is a partially omitted sectional view showing one embodiment of the present invention, and FIG.
, 3 are partially omitted sectional views showing conventional waterproof sheets, respectively. 1... Waterproof sheet, 2... Water impermeable sheet.

Claims (1)

[Claims] 1. A waterproof sheet characterized in that a three-dimensional random coil-shaped rigid water-permeable member having an internal communication space is at least partially laminated on a water-impermeable sheet directly or via a water-permeable sheet.