JPH0611978B2 - Tension buffering device for waterproof sheet in waterproof storage recess - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tension buffer device for a waterproof sheet in a waterproof storage recess such as a waste disposal site or a reservoir.

<< Prior Art >> Landfilling as the final disposal of waste is performed by excavating a storage recess in the ground such as in the mountains and inland areas, and filling the storage recess with waste.

A water blocking sheet made of synthetic resin is laid over the entire surface of the recess, and measures are taken to prevent secondary water pollution from the leachate from the waste being mixed with the ground or ground water.

The periphery of the water-blocking sheet is fixed by a sheet retainer in the periphery of the storage recess.

In addition, such a storage recess is also used as a reservoir for irrigation and the like.

<Problems to be solved by the invention> However, the water-blocking sheet has a relatively large amount of contraction and expansion due to temperature changes, and at the waste treatment plant, the water-blocking sheet is pulled toward the bottom side of the storage recess due to sinking of the waste. Get caught

For this reason, a large tension is generated especially in the peripheral part of the waterproof sheet,
In some cases, problems such as breakage of the waterproof sheet and lifting of the sheet retainer may occur.

The present invention has been devised in order to effectively solve the above problems, and an object thereof is to provide a tension buffering device capable of preventing an excessive tension from being generated in the water shield sheet.

<< Means for Solving the Problem >> In order to solve the above problems, the present invention lays a water barrier sheet over the entire surface of a storage recess formed by excavating the ground, and a peripheral portion of the water shield sheet is provided with the storage recess. In a waterproof storage recess fixed with a sheet retainer at the outer peripheral edge of the storage place, a cushioning material having a predetermined elasticity between the water-blocking sheet and the ground between the sheet retainer and the bottom of the storage recess. And the cushioning material lifted the water-blocking sheet upward by a predetermined amount.

<Operation> In the tension cushioning device configured as described above, when the water blocking sheet contracts or is pulled toward the bottom side of the storage recess, the water blocking sheet is crushed and lifted by the buffering sheet Since it is fed to the side, it is possible to prevent excessive tension from occurring in the water-impervious sheet, but when the water-impermeable sheet expands, the cushioning material returns to its original size, and the extra water-impermeable sheet is lifted by the cushioning material. As a result, the slack of the waterproof sheet is prevented.

«Examples» Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention.

In the figure, 1 is a storage recess formed by cutting the ground 2.

The storage recess 1 has a bottom portion 1a which is horizontal and an inclined peripheral surface 1b.

A synthetic resin waterproof sheet 3 is laid on the entire surface of the storage recess 1, and the peripheral portion of the waterproof sheet 3 is located between the annular groove 4 and the sheet retainer 5 at the outer peripheral edge of the storage recess 1. It is fixed by being sandwiched between.

Then, the waste 6 is stored in the storage recess 1.

A horizontal plane 7 is formed with a predetermined width between the upper end of the slope 1b and the annular groove 4, and a cushioning material 8 having a predetermined elasticity is disposed on the horizontal plane 7.

The peripheral portion of the water-impervious sheet 3 is in a state of being lifted by the cushioning material 8 by a predetermined amount.

The buffer material 8 is made of, for example, synthetic rubber, vinyl chloride, urethane, polyethylene, or other synthetic resin.

The cushioning material 8 is continuously arranged in an annular shape around the storage recess 1 along the horizontal surface 7, or the block-shaped cushioning material 8 having a predetermined size is disposed around the storage recess 1 at predetermined intervals. To do.

The shape of the cushioning material 8 is not particularly limited, but the shape having an acute angle may damage the water-blocking sheet 3, so that it has an arc shape or a circular cross section as shown in FIGS. 2 (A) to (D). Things are desirable.

The cushioning material 8 of FIG. 2 (A) has a substantially semicircular cross section,
The cushioning material 8a of FIG. 7B has an arcuate cross section, the cushioning material 8b of FIG. 6C has a solid circular cross section, and the cushioning material 8c of FIG. It has a cross section.

The cushioning material 8c shown in FIG. 2 (D) may be provided with notches as shown by the dotted line in the figure.

The cushioning member 8 is a nail-shaped member on the ground and is fixed to the horizontal surface 7,
Alternatively, it is fixed to the lower surface of the waterproof sheet 3 with an adhesive or the like.

The tension buffering device for the water-impervious sheet 3 is configured as described above, and when the water-impervious sheet 3 contracts due to a temperature drop during winter or night, the buffer material 8 is crushed by the tension of the water-impervious sheet 3.

And the water-impervious sheet 3 which the cushioning material 8 has lifted up is the slope 1b.
Is fed to the side.

Therefore, the tension of the waterproof sheet 3 does not become excessive.

The same applies when the waste 6 sinks and the water-impervious sheet 3 is pulled toward the bottom 1a along the slope 1b.

Next, when the water-blocking sheet 3 expands due to a rise in temperature during the summer or daytime, the force holding the cushioning material 8 decreases, so the cushioning material 8 grows to its original size, and the extra water-shielding caused by the expansion occurs. The seat 3 is lifted by the cushioning material 8.

Therefore, the slack of the water-impervious sheet 3 is eliminated, and the water-impermeable sheet 3 can be prevented from rising due to wind or the like.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made. For example, the disposition position of the cushioning material 8 is the slope 1b as shown in FIG. There may be two locations above and below.

That is, the contraction and expansion of the water-impervious sheet 8 occur between the sheet retainer 5 and the bottom portion 1a of the storage recess 1. Therefore, a cushioning material may be arranged at any position during this period.

Further, the present invention can be applied not only to a waste treatment plant, but also to a water blocking sheet of a reservoir or other pond.

<< Effects of the Invention >> As described above, the present invention raises the water blocking sheet by providing a cushioning material between the water blocking sheet and the ground between the sheet retainer and the bottom of the storage recess, so that the water blocking sheet is lifted. Even if contraction of the water sheet or pulling force to the bottom side occurs, the impermeable sheet lifted by the cushioning material is fed out, so it is possible to prevent excessive force from occurring in the impermeable sheet, and to prevent breakage of the impermeable sheet or It is possible to prevent problems such as the release of the seat presser.

Also, when the water-blocking sheet expands, the extra water-blocking sheet is lifted up by the restoration of the cushioning material, so the slack of the water-blocking sheet is eliminated and the water-blocking sheet can be prevented from rising due to wind or the like. .

[Brief description of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a vertical sectional view of a waterproof storage recess of a waste disposal site, and FIG. 2 (A).
(D) is a sectional view of a cushioning material, and FIG. 3 is a vertical sectional view of a waterproof storage recess according to another embodiment of the present invention. 1 ... Storage recess, 3 ... Impermeable sheet 5 ... Sheet retainer, 8 ... Buffer material

Claims (1)

[Claims] 1. A waterproof storage in which a water-blocking sheet is laid over the entire surface of a storage recess formed by excavating the ground, and the peripheral portion of the water-blocking sheet is fixed by a sheet retainer at the outer peripheral edge of the storage recess. In the recess, a cushioning material having a predetermined elasticity is disposed between the water impermeable sheet and the ground between the sheet retainer and the bottom of the storage recess, and the water impermeable sheet is formed by the cushioning material. A tension buffering device for a waterproof sheet in a waterproof storage recess, which is lifted by a predetermined amount.