JPS62225699A - 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 applicable to tunnels, for example, in which spring water from the ground side is installed between the ground or lining concrete of a tunnel and the secondary lining concrete. This invention relates to a waterproof sheet used to prevent leakage to the concrete lining side.

Traditionally, base sheet a has been used as a waterproof sheet to be stretched between the tunnel's ground or lining concrete and secondary lining concrete, as shown in Figures 8 and 9. A corrugated type waterproof sheet is known in which a large number of continuous mountain-like protrusions project from one end edge to the other at a predetermined distance from each other (Japanese Utility Model Publication No. 57-57199).

This corrugated type waterproof sheet is installed with its protrusions facing the ground, so that spring water from the ground flows through the grooves C formed between the protrusions and is drained. .

4 Points to be Solved by the Invention However, conventional corrugated type waterproof sheets of this type are difficult to bend, especially in the width direction of the protrusions, and lack flexibility, so they are difficult to bend, especially in the width direction of the protrusions. The problem is that it doesn't fit. Furthermore, if this corrugated type tarpaulin sheet is placed in a place with a lot of earth and sand, there is a fatal drawback that the earth and sand will accumulate in the groove C, clogging the groove C, resulting in loss of drainage and impairing the drainage function of the tarpaulin sheet. 6 The present invention was made to improve the above-mentioned situation, and has the flexibility to easily fit into the ground, primary concrete, etc., and does not impair its drainage function due to accumulation of earth and sand. The purpose is to provide waterproof sheets.

In order to achieve the above-mentioned object, the present invention provides a large number of discontinuous protrusions projecting in a staggered manner over almost the entire surface of one side of a synthetic resin base sheet, or This is a stack of sheets with discontinuous protrusions protruding in a staggered manner.

Diving 1 This waterproof sheet has a base sheet with a large number of discontinuous protrusions protruding in a staggered manner, or has laminated sheets with a large number of discontinuous protrusions protruding in a staggered manner, so it is different from the corrugated sheet described above. Compared to other types of waterproof sheets, it is easier to curve along the width direction of the protrusion and is more flexible, so when used for tunnel construction, for example, it is easier to fit into the ground or primary cover concrete, making it easier to construct. In addition, even if dirt accumulates between adjacent protrusions and stops the flow between them, each protrusion is discontinuous and arranged in a staggered manner, so water will flow between other protrusions. Flows horizontally and vertically, so drainage performance is not impaired, so it can be effectively installed and used even in areas with a lot of earth and sand.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 7.

Figures 1 and 2 show a waterproof sheet 1 according to an embodiment of the present invention.This waterproof sheet 1 has a base sheet 2 made of synthetic resin, and has a large number of cross-sections on one side of the base sheet 2 over almost the entire surface. The trapezoidal and elongated chevron-shaped protrusions 3 are discontinuously protruded in a staggered manner with a predetermined distance from each other.

Here, the base sheet 2 is made of polyethylene, for example.

It is formed from ethylene such as ethylene-vinyl acetate copolymer, ethylene-acrylic acid or acrylic acid ester copolymer, etc., polypropylene, polyvinyl chloride, etc., and its thickness is approximately 0.5 to 4 mm. is suitable.

Furthermore, the protrusions 3 may be made of the same material as the base sheet 2, or may be made of a different material. If the shape is a rectangular plane as shown in Figure 1.2, the height is 1 to 5 m+++ and the width is 1 to 5 m.
4mm, length 10~5011I! It is preferable to set it to about 1. Further, when the protrusion 3 has a planar circular shape or an elliptical shape, it is preferable that the height is about 2 to 30 nu++ and the diameter is about 3 to 30 mm. Furthermore, it is preferable that 500 to 5000 protrusions 3 are formed.

The method of forming the protrusions is not particularly limited, but methods such as arranging protrusions on a flat sheet and gluing or stamping them, or pasting a sheet with protrusions on a flat sheet may be adopted. obtain.

When this waterproof sheet 1 is used, for example, in tunnel construction, it is stretched between the ground or lining concrete and the secondary lining concrete. The projections 3 are arranged so that the length direction thereof runs along the circumferential direction of the tunnel.

As a result, spring water from the ground flows between the protrusions 3 along the surface of the base sheet 2.

According to this waterproof sheet 1, since the protrusions 3 are discontinuously arranged in a staggered manner, the protrusions 3 can be easily curved in the width direction.
It is easy to fit and install along the circumferential direction of the tunnel.

Therefore, the workability is good and the tensioning work is easily performed.

In addition, since the projections 3 of this waterproof sheet 1 are arranged in a staggered manner in a discontinuous manner as described above, it is difficult for the flow channel to be blocked due to the accumulation of earth and sand. Even if earth and sand 4 is deposited between the protrusion 3b and another protrusion 3b adjacent to it, and the gap between these protrusions 3a and 3b is blocked,
Since the water flows by bypassing another flow channel as shown by the arrow in the figure, drainage performance is not hindered. Therefore, it has excellent drainage performance and can be used effectively even in areas with a lot of earth and sand.

Here, in the above-mentioned embodiment, when a straight line U is drawn along the width direction at one end in the length direction of the - projection 3a,
Although the protrusions 3 are arranged in a staggered manner so that the other end in the length direction of the other protrusion 3b adjacent to the - protrusion 3a coincides with the straight line Q, the staggered arrangement is not limited to this.
For example, as shown in FIG. 3, other protrusions may be arranged so that the other end in the length direction is located outside the straight line Q, or as shown in FIG. It can be arranged so that the end is located inside the straight line 2.

In this case, the arrangement method shown in FIGS. 1 and 3 is preferable from the viewpoint of bending the waterproof sheet in the width direction of the protrusion 3.

5 and 6 show another embodiment of the present invention,
The waterproof sheet of this embodiment has a sheet body 6 formed by discontinuously providing a large number of hollow disc-shaped protrusions 3 on a plastic film 5 in a staggered manner, each of which has air sealed therein and has an independent air chamber inside. The base sheet 2 is bonded and laminated over the entire surface of the base sheet 2 so that the protrusions 3 are placed on the upper side. In this embodiment, as in the above-mentioned embodiment, the spring water flows between the protrusions 3, and even if dirt accumulates between the - protrusion and other protrusions adjacent thereto, drainage performance is inhibited. Never.

Further, in the embodiment shown in FIGS. 5 and 6, air is sealed inside the protrusion 3 to form an independent air chamber, so that vibrations can be effectively absorbed. Here, the height of the protrusion is 2 to 30 mm, especially 4 to 10 m.
m, and the diameter is preferably 3 to 30 mm. It should be noted that the other configurations and effects of the embodiment shown in FIGS. 5 and 6 are the same as those of the embodiment described above, and therefore their explanation will be omitted.

FIG. 7 shows still another embodiment of the present invention, and the waterproof sheet according to this embodiment is a sheet in which a large number of discontinuous protrusions 3 are provided on a base sheet 2 in a staggered manner.

The sheet body 7 is partially glued 8. According to this, the portion of the base sheet 2 that is not bonded to the sheet body 7 can be stretched independently of the sheet body 7, so it can be It is easy to fit and construct with primary covering concrete. Note that the other configurations and effects are the same as those of the above-mentioned embodiments, so their explanations will be omitted.

In addition, in the present invention, the shape of the protrusion 3 is not limited to the illustrated embodiment, and may be formed in any suitable shape, such as a square cross section, and other configurations may be varied without departing from the gist of the present invention. You may change it.

As explained above, according to the present invention, one side of the synthetic resin base sheet has a large number of discontinuous protrusions arranged in a staggered manner over almost the entire surface, so it has flexibility. However, it is easy to fit into the installation location, and the flow of water is less likely to be inhibited by accumulation of earth and sand, so that drainage performance is not impaired.

[Brief Description of the Drawings] Fig. 1 is a partially omitted plan view showing one embodiment of the present invention;
The figure is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 and 4 are partially omitted plan views showing other embodiments of the present invention, respectively.
FIG. 5 is a partially omitted plan view showing another embodiment of the present invention, FIG. 6 is a sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a partially omitted plan view showing another embodiment of the present invention. A partially omitted sectional view, Fig. 8 is a partially omitted plan view of a conventional waterproof sheet, and Fig. 9 is a partially omitted cross-sectional view.
It is a sectional view taken along the line -■. 1... Waterproof sheet 2... Base sheet 3.3a, 3
b... Protrusion Figure 5 Figure 7

Claims (1)

[Claims] 1. A large number of discontinuous protrusions are provided in a staggered manner over almost the entire surface of one side of a base sheet made of synthetic resin, or sheets with a large number of discontinuous protrusions provided in a staggered manner are laminated. A waterproof sheet that is characterized by