JPS61148040A - Cut-off sheet with one-way water-penetrating valve - 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 relates to a water-blocking sheet used when constructing embankments or revetments in rivers, lakes, etc. The present invention relates to a water-shielding sheet equipped with a water-permeable valve that allows water that permeates and is stored in a dam body due to rain or the like at high water levels to be drained in one direction only, allowing water to be drained at low water levels.

(Prior Art) Conventionally, a method has been adopted in which a water-blocking sheet is buried in the bodies of river embankments, lakes, and other embankments whose purpose is to prevent water leakage. In this way, an embankment body with a conventional seepage-shielding sheet buried,
When the water level of a river, lake, or marsh is high, the impermeable sheet is convenient because it can prevent water from penetrating into the embankment.

(Problems to be Solved by the Invention) However, water that has permeated due to rainfall, etc. may be stored in the embankment body in which the above-mentioned conventional water-blocking sheet is buried, causing the water level of rivers and lakes to drop. Despite the fact that
The water level of water that has permeated into the embankment and is stored may remain high and not fall. Therefore, conventionally, when the water level of the water stored inside the embankment is higher than the water level of a river or lake, the stored water presses against the water-shielding sheet, weakening the water-shielding sheet and, in some cases, causing water to leak onto the water-shielding sheet. There was a problem in that the concrete blocks that had been laid could be destroyed, causing inconveniences such as trenches.

(Means for Solving the Problems) As a result of intensive study by the present inventors to provide a water-blocking sheet that can solve the above-mentioned conventional problems, the inventors have found that the water-blocking sheet is provided with a water-permeable valve of a special structure. The present invention was achieved by discovering for the first time that the above-mentioned conventional problems can be solved by using the method described above.

That is, in the present invention, when the water level of a river or lake is high,
A water-blocking sheet is installed that does not allow water to permeate into the embankment, but when the water level stored within the embankment is higher than the water level of a river or lake, it allows the stored water to permeate to the front side or lake side. The gist of the present invention is to make a plurality of small holes at intervals in a water-blocking sheet made of a flexible synthetic resin sheet. Layer a small sheet made of flexible synthetic resin with an area larger than the area of the small hole from one side of the water-shielding sheet, and place the outer periphery of the small sheet that overlaps with the water-shielding sheet,
A water-blocking sheet with a one-way water-permeable valve is characterized in that the sheet is bonded with a non-adhesive portion remaining to form a water-permeable valve that allows water to permeate only in one direction.

The present invention will be explained in detail below.

In the present invention, a flexible synthetic resin notebook refers to a sheet made of synthetic resin with excellent flexibility. As a synthetic resin,
Polyethylene, polypropylene, ethylene-vinyl acetate copolymer, polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, polyvinyl chloride, polyamides, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyacetal, polyacrylic ester , polymethyl methacrylate, synthetic rubber, natural rubber, etc. Among these, soft blended polyvinyl chloride, ethylene-vinyl acetate copolymer, synthetic rubber, etc. are suitable.

The sheet may be manufactured from the above synthetic resin material by a known method such as an extrusion molding method or a calendar molding method. If necessary, a coloring agent, a stabilizer, a filler, a fungicide, an algaecide, a rodent repellent, etc. may be added to the synthetic resin material before it is formed into a sheet.

In addition, in order to improve the strength of the 7-toe, thread is added to the 7-toe.
A reinforcing material such as a net or cloth may be buried.

The sheet should preferably be wide and long; if the sheet is narrow, it may be spliced in the width direction to widen the sheet. The thickness of the sheet varies depending on the purpose of use, the type of synthetic resin material, the presence or absence of reinforcing material, etc., and can be selected within the range of 1 to 10111.

The water-blocking sheet according to the present invention includes a plurality of water-permeable valves that are spaced apart and allow water to permeate only in one direction.

In order to form a one-way water permeable valve on a water-shielding sheet, the shape may be round, polygonal, etc., and its size can be selected within the range of 1 to 10 m in length.

Next, a small sheet made of flexible synthetic resin having an area larger than the area of the small holes is placed over each small hole from one side of the water-blocking sheet. The material of the small sheet is not particularly limited as long as it can be bonded to the water-shielding sheet of the base. The thickness of the small sheet may be the same as that of the base sheet, or may be slightly thinner.

Subsequently, the outer periphery of the small sheet and the portion that overlaps with the water-blocking sheet is bonded, leaving a non-bonded portion. Adhesion can be easily done by thermal adhesion, but it is also possible to use an adhesive for adhesion. For example, if the small hole is circular, the non-adhesive part is formed in dots along the outer periphery of the small hole, leaving a dotted non-adhesive part, or if the small hole is square, the non-adhesive part is formed along the three sides of the rectangle. It can be formed by a method such as adhesively bonding and leaving one side as a non-bonded part.

It is preferable that the intervals between the small holes provided in the water-blocking sheet be coarse in the part located above the embankment body, and closer in interval in the part located below the embankment body. Furthermore, it is preferable that the small sheet to be glued over the small hole should be thinner if it is placed over the hole located above the embankment body, and thicker if it is to be covered over the small hole located below the embankment body.

(Example) Next, the present invention will be explained in more detail with reference to the drawings, but unless it exceeds the gist of the present invention, the front view of the example shown below, and FIG. Enlarged view of water permeability valve), No. 3
The figure is a cross-sectional view taken along the line ■-11 in Figure 2. (a) shows the state in which the one-way water permeability valve is closed by being pressed from the direction of arrow A, and (b) shows the state in which the water stored in the embankment body is closed. The state in which it is opened by pressure from the direction of arrow B and flows out is shown. Figure 4 is an example of another one-way permeable valve, and corresponds to Figure 2, and Figure 5
The figure is a sectional view taken along the line V-V in FIG. 4, and FIG. 5(a) corresponds to FIG. 3(a), and FIG. 5(b) corresponds to FIG. 3(b), respectively. FIG. 6 is a longitudinal sectional view of an example of an embankment body constructed using the water-blocking sheet according to the present invention, and FIG. 7 is an enlarged view of a portion of FIG. 6.

In the figure, 1+11+21 are water-shielding sheets, 2
．． 22 are one-way water permeable valves, 3+13+23 are small holes, 4114124 are small seats, 5!
15 is a bonded part, 6 is a non-bonded part, 7. 17 is a passage for stored water, 18 is an intermediate sheet, 20
25 and 26 are backfilling materials, 27 is a suction prevention agent, 28 is a concrete slab, and 29 is a steel sheet pile.

Figures 1 to 5 show small holes 3 and 1 made in the water-blocking sheet.
3 shows an example in which the shape is rectangular.

The shape of the small sheet 4v14 overlaid on the small holes is a rectangular shape with an area larger than the area of these small holes.

In the example shown in FIGS. 2 and 3, the small sheet 4 is one piece, and in the example shown in FIGS. Holes of the same size are made and the intermediate sheet 1 has the same area as the small sheet 14.
8 is interposed and adhered.

(Function) 3 small holes like this 13.23 and a small sea) 4+14
The respective combinations with +24, i.e. 3 and 4.13 and 1
4. Each one-way water permeable valve formed by each combination of 23 and 24 has the surface to which the small sheet 24 is bonded, as shown in FIGS. 6 and 7 in one state of use.
Located on the river or lake side. In this way, when the water level of a river or lake is high, the one-way water permeability valve will move to the arrow A as shown in (a) in Figures 3 and 5.
The non-adhesive portions of the small sheets 4+14 adhere to the water-blocking notebooks 1 and 11, thereby closing the passage 7117 of the stored water. Therefore, water from rivers or lakes can be prevented from penetrating into the embankment body.

On the other hand, when the water level of a river or lake decreases and the water level that has permeated into the embankment due to rainfall, etc. and is stored is high, as shown in (b) of Figures 3 and 5, 4.14 When the directional water permeability valve is pressed from the direction of arrow B, the small sea
The non-adhesive part of is separated from the waterproof notebook L+11, the passages 7 and 17 of the stored water are opened, and when the water level is lowered, the stored water permeates into the water level of the river or lake and into the embankment body and is stored. Depending on the positional relationship with the water level, the water stored within the embankment can be preferably and appropriately discharged.

(Effects of the Invention) The present invention has the following particularly remarkable effects, and its industrial utility value is extremely high.

(1) Since the water-blocking sheet according to the present invention is formed with a one-way permeable valve that allows water to pass in only one direction, an embankment body constructed using the same can prevent water from entering the embankment body, and A remarkable effect can be achieved in that the water that has permeated into the embankment body and is stored therein can be easily and desirably and appropriately discharged. Therefore, the embankment body is less likely to become weakened, and the concrete blocks are also prevented from breaking, thereby increasing the safety and durability of the embankment body.

(2) Since the water-blocking sheet according to the present invention is made of flexible thermoplastic synthetic resin, it can be easily adapted to the shape of the ground and the shape of the embankment, and is easy to construct. However, even if land subsidence occurs, water-shielding sheets have excellent adaptability and are not easily damaged.

[Brief explanation of the drawing]

The enlarged view and FIG. 3 are cross-sectional views taken along the line III-It in FIG. FIG. 5 is a sectional view taken along the line V-V in FIG. 4, and FIG. Figure 5 (b) corresponds to Figure 3 (b), respectively. FIG. 6 is a longitudinal cross-sectional view of an example of an embankment body constructed using the water-shielding sheet according to the present invention, and FIG. 7 is an enlarged view of the section ■ in FIG. 6. In the figure, 1111121 is a water-blocking sheet, 2
ν22 are one-way water permeable valves, 3+13+23 are small holes, 4, 14, and 24 are small seats, 5,
15 is a bonded part, 6 is a non-bonded part, 7 and 17 are channels for stored water, 20 is an embankment body, 25+26
27 is a backfilling material, 27 is an anti-wicking agent, and 28 is a concrete pro. 29 indicates a steel sheet pile.

Claims (1)

[Claims] (1) A plurality of small holes are made at intervals in a water-blocking sheet made of a flexible synthetic resin sheet, and each small hole is filled with a small flexible synthetic resin sheet with an area larger than the area of these small holes.
Overlapping the water-shielding sheet from one side and gluing the outer periphery of the small sheet that overlaps with the water-shielding sheet, leaving a non-adhesive part to form a water-permeable valve that allows water to permeate in only one direction. A water-blocking sheet with a one-way water-permeable valve.