JPH0730678B2 - Waterproof sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention is particularly applicable to civil engineering works such as the ground of a tunnel or between a primary lining concrete and a secondary lining concrete from the side of the primary lining concrete. The present invention relates to a waterproof sheet used to prevent the spring water from leaking to the side of the secondary lining concrete.

Conventional technology Conventionally, as seen in the NATM method, a waterproof sheet is installed between the ground of the tunnel or the primary lining concrete and the secondary lining concrete, and the spring water from the primary lining concrete side (tunnel Water leakage from the ground) is prevented from leaking to the secondary lining concrete. As a waterproof sheet used for this purpose, a synthetic resin sheet and a non-woven fabric are bonded together. Japanese Patent Application Laid-Open No. 51-37844), a synthetic resin sheet having one surface formed in a corrugated shape (Japanese Utility Model Laid-Open No. 58-63299), and the like have been proposed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in these conventional waterproof sheets, since the synthetic resin sheet is relatively thick and is formed of a single layer, the degree of elongation of the synthetic resin sheet is low and the primary lining concrete When it is arranged and fixed on the ground, there is a problem that it is difficult to follow the ground or the unevenness of the primary lining concrete. For example, in a waterproof sheet obtained by laminating a non-woven fabric to a synthetic resin sheet, the elongation of the non-woven fabric itself is insufficient to follow the irregularities of the primary lining concrete, and if the non-woven fabric is forcibly followed, the non-woven fabric is broken in the middle. Also, with a synthetic resin sheet with one side formed in a corrugated shape, it is possible to follow the unevenness of the primary lining concrete to some extent if it is pulled strongly, but if it is pulled strongly, the thickness of the sheet will become partially thin, and it will stop as a waterproof sheet. There are unsatisfactory points in the water function. Furthermore, when pouring secondary lining concrete, these waterproof sheets may be damaged by fixing the formwork or moving the center, and water leakage may occur from the damaged location. Sometimes lost the function of.

The present invention has been made in view of the above circumstances, and can be reliably arranged and fixed so as to follow the ground or the unevenness of the primary lining concrete, and when the secondary lining concrete is placed, the mold is fixed and the center is fixed. An object of the present invention is to provide a waterproofing sheet for civil engineering, which is not likely to be damaged even if pressure is applied by movement of the.

Means for Solving the Problems That is, the present invention, in order to achieve the above object, in a civil engineering tarpaulin provided with a water-impermeable tarpaulin body, a plurality of non-sealing waterproof sheet main body is laminated on each other. Provided is a waterproof sheet for civil engineering, which comprises a sheet made of a water-permeable synthetic resin, and these sheets are partially fixed and integrated with each other.

In the waterproof sheet of the present invention, by stacking a plurality of water-impermeable synthetic resin sheets on each other as described above, the sheet main body is configured in a plurality of layers, and each of these component sheets is partially By fixing and integrating,
Each constituent sheet can expand and contract to some extent. Therefore, as compared with the case where a single-layer synthetic resin sheet is used to form a sheet body having the same thickness, the thickness of each constituent sheet is thin, so that each constituent sheet can follow the irregularities of the primary lining concrete. Can give a sufficient elongation of
The sheet body can be made to follow the ground or irregularities of the primary lining concrete reliably. Moreover, even if the pressure of the concrete when the secondary lining concrete is poured causes damage to one of the constituent sheets, it is unlikely that the other constituent sheets will be damaged by the pressure. When viewed, the probability of causing damage such as penetrating the sheet is lower than that of a single-layer sheet. Therefore, the waterproof sheet of the present invention is particularly interposed between the primary lining concrete and the secondary lining concrete of the tunnel, and the spring water from the primary lining concrete side leaks to the secondary lining concrete side. It is preferably used as a waterproof sheet for preventing

Next, the present invention will be specifically described with reference to examples, but the present invention is not limited to the following examples.

Embodiment FIG. 1 shows a waterproof sheet according to an embodiment of the present invention, in which 1 is a waterproof sheet main body. This seat body 1
The two impermeable synthetic resin sheets 2 and 3 are superposed on each other, and both widthwise end portions thereof are partially fixed to each other to be integrated. In this case, the widthwise ends are
It is configured as a single-layer sheet portion 4,5 having a thickness capable of being heat-bonded to another waterproof sheet main body, and these single-layer sheet portions 4,5 are joint portions with other waterproof sheets. In addition, a plurality of molds 6 filled with a heat-fusible resin are heat-bonded to the waterproof sheet main body 1 so as to be partially separated from each other by a predetermined distance. Both synthetic resin sheets 2 and 3 are heat-bonded to each other.

FIG. 2 shows another embodiment of the present invention. The waterproof sheet main body 1 comprises three rectangular impermeable synthetic resin sheets.
7,8,9 are overlapped, and both widthwise ends thereof are configured as single-layer sheet joints 4,5 in the same manner as above, whereby the sheets 7, 8, 9 are partially fixed and integrated. It is a thing. In addition, a plurality of molds 6 partially filled with a heat-fusible resin are heat-bonded to the sheet main body 1, and the sheets 7, 8 and 9 are arranged at the positions where these molds 6 are arranged. Heat bonded to each other.

FIG. 3 shows still another embodiment of the present invention. In this waterproof sheet, a water-permeable sheet 10 made of non-woven fabric or the like is provided on one surface of the sheet body 1 shown in FIG. ,Five
Also, the mold frame 6 is partially heat-bonded.

In each of the above-mentioned embodiments, a plurality of water-impermeable synthetic resin sheets are superposed on each other, both widthwise end portions thereof are fixed, and further, the sheets are heat-bonded to each other at the place where the mold 6 is arranged. However, it is not always necessary to dispose the mold 6 in the waterproof sheet of the present invention.

Since the waterproof sheet main body of the above-mentioned embodiment is integrated by stacking a plurality of water-impermeable synthetic resin sheets on each other and adhering both widthwise end portions to form a single-layer sheet portion, each constituent sheet is It expands and contracts to some extent and can reliably follow the ground or the irregularities of the primary lining concrete, and it is unlikely that damage such as penetrating the waterproof sheet throughout its thickness direction will occur, and the single-layer sheet part Since it can be heat-bonded to the waterproof sheet, it can be easily connected to other waterproof sheets, and these sheets are integrated as compared to the case where a plurality of impermeable synthetic resin sheets are simply arranged. The installation work is simple because it is installed.

In the present invention, as each water-impermeable synthetic resin sheet forming the waterproof sheet body 1, a sheet made of polyethylene, ethylene-vinyl acetate copolymer, polypropylene, polyvinyl chloride or the like is preferably used. In this case, the thickness of each synthetic resin sheet is not limited, but is 0.2 to 1.0 mm, particularly 0.
It is preferably about 4 to 0.6 mm.

Further, the means for fixing the synthetic resin sheets to each other and integrating them are not particularly limited, but both widthwise end portions are configured as single-layer sheet portions as in the above-mentioned embodiment, and thus, fixing,
It is preferable to integrate them. In this case, the width of the single-layer sheet portion is preferably 100 to 300 mm, particularly preferably 150 to 250 mm, which facilitates thermal bonding with another waterproof sheet.

In the present invention, there is no limitation on the number of synthetic resin sheets to be superposed, but it is usually preferable that the number is 2 to 4. Further, it does not matter even if sheets of different materials are stacked. In particular, as shown in FIG. 4, the single-layer sheet portion may be increased in thickness or partially laminated with a sheet 11 of another material in order to maintain heat resistance.

EFFECTS OF THE INVENTION As described above, the waterproof sheet of the present invention has the waterproof sheet main body formed by superimposing a plurality of water-impermeable synthetic resin sheets on each other and partially fixing and integrating them. , When stretched and fixed on the ground or the primary lining concrete, the stretch of each sheet is higher than that of a single-layer tarpaulin of substantially the same thickness, so the unevenness of the ground or the primary lining concrete It is possible to reliably follow and stretch and fix. Further, as compared with a single-layer waterproof sheet, damage such as penetrating the waterproof sheet in the thickness direction is less likely to occur.

[Brief description of drawings]

1 to 3 are sectional views showing a waterproof sheet according to one embodiment of the present invention, and FIG. 4 is a partially omitted sectional view showing another embodiment of the present invention. 1 …… Waterproof sheet body, 2,3,7,8,9 …… Impermeable synthetic resin sheet, 4,5 …… Single layer sheet section (fixed section),

Claims (1)

[Claims] 1. A waterproofing sheet for civil engineering, comprising a water-impermeable waterproof sheet main body, which comprises a plurality of water-impermeable synthetic resin sheets obtained by stacking the waterproof sheet main bodies on top of each other, and these sheets are mutually connected. A tarpaulin for civil engineering, characterized by being partially fixed and integrated.