JP3129013B2 - Waterproof sheet protection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-impervious sheet protection structure for preventing breakage of a water-impervious sheet laid at a waste disposal site.

[0002]

2. Description of the Related Art In a landfill type waste disposal site for dumping industrial waste and general waste, if sewage leaks from the disposal site, the sewage may penetrate underground and cause environmental pollution. .

[0003] In order to prevent this, it is obligatory to implement a water shield on the bottom of the disposal site.

As such a water-blocking work, a method of laying a soft synthetic resin-based or rubber-based water-blocking sheet has conventionally been adopted from the viewpoints of reliability, safety, workability, economy and the like.

[0005] That is, a water-blocking sheet made of the above-mentioned materials has almost no water permeation as compared with other materials, has good water-blocking properties, and can be simply laid. It has such characteristics as:

[0006]

However, in the water-blocking works using only the water-blocking sheet, there are sharp projections in the waste, which are pierced into the water-blocking sheet by the accumulation pressure of the waste. There is a risk that the impermeable sheet will be damaged and sewage will flow out of the damaged area, polluting the surrounding environment.

[0007] As a countermeasure to this problem, for example, two layers of the water-impervious sheet are provided, and even if the first layer of the water-impervious sheet is torn, two layers are provided.
A method of preventing leakage of sewage with a layer of impermeable sheet has been considered, but depending on the penetrating pressure of the projections, the sheet may be broken down to the second level of impermeable sheet, which is a complete measure to prevent leakage. I didn't. Also in the case of water-impervious sheet positioned on the slopes may write Murrell dragging along the slope by subsidence due to deposition of waste, this part is concentrated locally stress when such fracture In some cases, the material was stretched or stretched, and the water barrier was not maintained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a protection structure for a water-impervious sheet in which protrusions do not reach the water-impervious sheet and do not break due to dragging. Aim.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the protection structure of a seepage control sheet laid in a waste disposal site according to the present invention is as follows. a protective structure of the sheet, penetration against the buffer material block or Ranaru predetermined thickness is laid on the upper surface of the shielding water seat to prevent the penetration of the projection Styrofoam, protrusions cover the upper surface of the cushioning member be made of a nonwoven fabric to function as a resistor or a woven cloth or Ranaru protective mat for preventing penetration is characterized in.

[0010]

In the protective structure of the waterproof sheet described above, the construction is completed by sequentially laying the cushioning material and the protective mat on the upper surface of the lower waterproof sheet laid at the laying site of the waste disposal site.

[0011] Even if a sharp projection contained in the waste deposited on the upper part of the protective mat is pressed against the protective mat by the deposition pressure, further penetration is prevented by the penetration resistance as much as possible. Protect the impermeable sheet.
Furthermore, even if the protective mat is pierced, the penetration pressure is dispersed according to the thickness of the cushioning material to protect the waterproof sheet. When the retraction occurs, relative slippage occurs between the protection mat and the cushioning material, and only the protection mat is retracted while breaking the cushioning material, so that no local tensile stress is generated in the water impermeable sheet.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of a waste disposal site 10 on which a waterproof sheet according to the present invention is laid.

In the figure, a waste disposal site 10 is obtained by excavating a large site in, for example, a mountain area in a concave shape, and a water-impervious sheet 12 is laid on the surface of the excavated ground E. Absorbing material 1 of predetermined thickness on the upper surface
4 are laid all over the surface, the upper surface of the cushioning material 14 is covered with a protection mat 16, and the waste H is sequentially deposited on the protection mat 16.

The water-blocking sheet 12 is a synthetic resin or a vulcanized or non-vulcanized rubber-based sheet, and is set to have a strength and a thickness to resist the pressing force of the waste H added thereto. The seams between the water impermeable sheets 12 are integrally joined by heat welding.

The cushioning member 14 is made of, for example, a block of styrene foam having a certain thickness, and covers the surface of the water-blocking sheet 12 with the block being spread all over the surface. This thickness is set to a thickness sufficient to prevent the protrusion from penetrating.

The protective mat 16 is made of non-woven fabric or woven fabric and functions as a penetrating resistor for sharp projections, and is set to have a strength and a thickness satisfying this function.

Therefore, as shown in FIG. 2, for example, when the sharp projection H1 in the waste H is pressed against the water-blocking sheet 12 by the deposition pressure or the like, the projection H1 presses the protection mat 16, The penetration resistance is prevented as much as possible by the penetration resistance, and the impermeable sheet 12 is protected. Furthermore, even if the protection mat 16 is pierced, the penetration pressure is dispersed according to the thickness of the cushioning material 14, so that the penetration does not reach the water impermeable sheet 12, and the water impermeable sheet 12 is protected.

Further, at the laying position on the slope of the impermeable sheet 12, when a dragging force occurs in the direction of the arrow in FIG. 1 due to the consolidation settlement due to the accumulation of the waste H, the impermeable sheet 12 causes local tensile stress. This causes a stress such as breakage or elongation. However, in this protective structure, a relative slip occurs between the protective mat 16 and the cushioning material 14, or the cushioning material 14
Therefore, only the protective mat 16 is dragged in while breaking, so that breakage and elongation of the water-blocking sheet 12 are also prevented.

[0019]

As described in detail in the above embodiments, in the protection structure for a water-impervious sheet according to the present invention, the styrofoam is laid on the upper surface of the water-impervious sheet to prevent penetration of protrusions. because a block or Ranaru predetermined thickness of the buffer material, it is made of a nonwoven or woven fabric or a protective mat for preventing Ranaru penetration functioning as penetration resistance for the buffer material upper surface of the cover projections of the projections The object does not reach the impermeable sheet, and breakage or elongation due to drag or the like is prevented. Therefore, there is no fear of soil contamination due to infiltration of sewage into the ground, and the safety and reliability of the waste disposal site can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing one embodiment of a waste disposal site provided with a protection structure for a seepage control sheet according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of the protection structure of the impermeable sheet.

[Description of Signs] 10 Waste disposal site 12 Waterproof sheet 14 Buffer material 16 Protective mat E Ground

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-176012 (JP, A) JP-A 63-86816 (JP, U) JP-A 63-88429 (JP, U) (58) Investigation Field (Int. Cl. ⁷ , DB name) B09B 1/00

Claims (1)

(57) [Claims] 1. A protective structure seepage control sheet to be laid on the waste disposal site, are laid on the upper surface of the shielding water seat to prevent the penetration of the projection of the block or Ranaru predetermined thickness of styrofoam and cushioning material, protective structure for water shield sheet characterized by comprising a non-woven or woven cloth or protective mat for preventing Ranaru penetration functioning as penetration resistance for the buffer material upper surface of the cover projections of.