JPH1128440A - Impervious sheet and execution structure by this sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impervious sheet which still maintains a remarkable waterproof and impervious effect even if the damage, such as pricking or cracking by a projection acting on this sheet arises from both front and rear surface sides of the impervious sheet when the sheet is laid and installed in an industrial waste reclamation land of the severest execution environment. SOLUTION: The impervious sheet 1 consists of a double-layered structure consisting of a base sheet 2 and an upper sheet 6 disposed above this base sheet. Both sheets are connected to each by partition walls 3 assembled to a grid form in plane view. Cushion sheets 5 are inserted in each block 4 formed by both sheets 2, 6 and the partition walls 3 so as to maintain hermeticity. The block groups are expanded and successively joined to a plane form by the structure described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seepage control sheet and a construction structure of the sheet which can be used widely in various types of wooden construction work, and is used for preventing groundwater and soil pollution in an industrial waste landfill. The present invention relates to a water-impervious sheet capable of exerting an effect and a construction structure of the sheet.

[0002]

2. Description of the Related Art In various industrial fields such as civil engineering, construction, agriculture, etc., there is a growing need for landfilling of general and industrial wastes, as well as for water dumping and storage, and in particular, for disposal and disposal of general and industrial wastes. Strict treatment conditions are required for the accompanying water quality and soil fouling.

[0003] Water-blocking materials having properties such as tensile strength, tear strength, burst strength, elongation, and durability, weather resistance, and waterproofness required for water-blocking sheets used in various industrial fields. Various sheets have been proposed, and the basis is widely used a water-impervious sheet which has been expanded by joining the side edges and the edges of a single sheet having a thickness of 1.0 to 10.0 mm. Have been.

[0004]

[0005] A single sheet of water-blocking sheet having high elasticity and elasticity can provide satisfactory waterproofing and shielding for a long period of time when the conditions of use, such as a reservoir and a culture pond, are relatively moderate. It is possible to maintain and expect the water effect. One of the most rigorous use conditions required for the installation site of a water-blocking sheet is a case where the purpose is to block and waterproof a general or industrial waste landfill.

[0005] When a mountainous area is required as an industrial waste landfill, the exposed surface of the landfill has roots of felled trees,
Various projections such as stumps and sharp-pointed point rocks are exposed,
In addition, various types of heavy industrial waste with sharp projections that are dumped on the surface of the impermeable sheet after laying can damage the impermeable sheet and deteriorate the durability of the sheet earlier than on both sides. The result will be terrible.

Further, a raised surface locally left on the surface of a waste landfill site, a locally generated depression phenomenon, and a crack caused by a partial extension of the water-impervious sheet due to heavy dumped waste. Occurrence of such factors increases with the passage of time, and is one of the causes of the regression of the original waterproofing purpose of the waterproof sheet.

According to the present invention, when the water-impervious sheet is laid and constructed in an industrial waste landfill where the construction environment is the most severe, piercing, cracking, etc. of the water-impervious sheet from both the front and back sides due to the protrusions acting on the sheet In order to maintain a remarkable waterproof and water-blocking effect even when damage occurs, the water-blocking sheet adapts to deformation of the ground surface due to local unevenness that occurs on the landfill surface or that remains. Another purpose is to prevent the occurrence of cracks on the impermeable sheet by demonstrating the worst case, the worst case, puncture holes, the occurrence of cracks, etc. Another purpose is to keep the damage limited and to prevent further damage from spreading. It is another object of the present invention to provide a construction structure that protects and reinforces the water-impervious sheet according to the laying state of the water-impervious sheet.

[0008]

Means for Solving the Problems In order to achieve these objects, the water impermeable sheet according to the present invention employs the following configuration. The water-impervious sheet has a two-sheet structure of a base sheet and an upper sheet, and the upper and lower sheets are connected by partition walls assembled in a large lattice shape in plan view. With both sheets having elasticity and flexibility and a partition wall, in each block partitioned and formed while maintaining independence and airtightness, a cushion sheet is respectively installed, and a block group having the above structure, The sheet is extended in a planar shape to form a seepage control sheet.

Considering one block portion having a cushion sheet as a core body in the center of the structure, the structure is such that a base sheet portion is arranged on the lower surface side of the cushion sheet, an upper sheet portion is arranged on the upper surface side, and furthermore, By surrounding the entire peripheral portion of the cushion sheet with a partition wall connecting the base sheet portion and the upper seat portion in a sealed manner,
One block portion is formed, and the block portion is extended in a planar shape while sharing a partition wall with an adjacent block portion having the same configuration to form a waterproof sheet.

[0010] The laying construction structure of this impermeable sheet includes:
Due to the structural change of the site where the sheet is to be laid, the laying response changes. More specifically, in a case where a large impact load is less likely to be applied to the front side of the water-blocking sheet, for example, in the case of water-blocking of a reservoir, a reinforcing sheet having cushioning properties is arranged only on the back side of the water-blocking sheet, and Place emphasis on reinforcement at the center of the back side of the water sheet.

In the case of a general waste disposal site, for example, where the surface of the site to be laid is subjected to sufficient finishing treatment and sufficient maintenance while maintaining its smoothness, for example, the surface side of the impermeable sheet Arrange a reinforcing sheet with cushioning property only on
Emphasis is placed on reinforcement on the front side of the impermeable sheet.

Further, the finishing work of the surface of the landfill is rough,
Sufficient laying environment such as a landfill where large industrial waste is dumped, where sufficient maintenance has not been performed and the weight of the waste is large and sharp protrusions are left on the dumped material itself In, reinforcing sheets having cushioning properties are arranged on both the front and back surfaces of the impermeable sheet, and the emphasis of reinforcing the impermeable sheet is placed on both sides of the sheet.

[0013]

[Function] A large number of sharp projecting pieces such as stumps of cutting trees, tree roots, rocks, etc., remain on the surface of the waste landfill site. When the waste is dumped on the laid water-impervious sheet surface, puncture holes or cracks may be generated in the base sheet portion of the water-impervious sheet due to the load of the waste. Due to the presence of the cushion sheet incorporated in the water-impermeable sheet, the breakage of the fold does not reach the upper sheet portion and the penetration crack does not reach, and the safety of the water-impermeable sheet is ensured.

On the contrary, when the waste is dumped on the laid main sheet, the upper sheet which constitutes the waterproof sheet is caused by the load of the waste or the presence of the sharp projections of the waste itself. Even if a damaged portion occurs in the portion, the damaged portion can be prevented from reaching the base sheet portion due to the presence of the cushion sheet embedded in the water-impermeable sheet.

Also, when the landfill surface is partially uneven due to unevenness remaining locally on the landfill surface or uneven settlement that occurs after sorting, etc., the impermeable sheet also corresponds to the unevenness. When a part of the sheet is stretched or in the worst case and a part of the water-impervious sheet is cracked, the compression or stretching deformation of the base sheet or upper sheet part that constitutes the water-impervious sheet The partial deformation is absorbed and shared by the partition walls that fall and slop, thereby suppressing damage to the water-impervious sheet from this portion and further preventing damage from spreading thereafter.

More specifically, as an example, even in the case where the base sheet is stretched to follow the ground fluctuation and the load fluctuation and is worst-case cracked, the upper sheet is provided with a margin corresponding to the height of the partition wall. The occurrence of breakage of the sheet itself can be avoided.

In the worst case on the water impermeable sheet, that is, when a puncture hole or a crack is continuously formed in the upper sheet portion and the base sheet portion, the damaged portion is surrounded by a partition wall. In one or several blocks or more, the expansion propagation is blocked, and the range of deterioration of the water impermeable sheet can be limited to a local one.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In a water-impervious sheet according to the present invention, an upper sheet is disposed so as to face above a base sheet, and these two sheets form a partition wall assembled in a large lattice in plan view. It is connected and integrated through the interface. A cushion sheet is provided in each of the closed independent blocks formed by the two seats and a partition wall assembled in a lattice shape therebetween. Each of the blocks having the above-described configuration is shared by a partition wall and spreads out in a plane to form a two-layer water-blocking sheet.

The base sheet portion, the upper sheet portion and the partition wall are all made of an elastic material having flexibility and elasticity. For example, a synthetic resin or synthetic rubber made of polyvinyl chloride, polyethylene or the like is used. In the case of a square grid-like partition wall shown in the figure, one side of the partition wall is 1000 to 3000 mm, the thickness of each of the base sheet portion and the upper sheet portion is 5 mm or less, and the cushion sheet is a nonwoven fabric sheet or a foam sheet. The thickness is about 10 mm.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a waterproof sheet according to the present invention. FIG. 1 is a partially cutaway plan view of a part of the water-impervious sheet, and FIG. 2 is an enlarged sectional view taken along line AA of FIG. The water-impervious sheet 1 has the same side edges as those of the base sheet 2 which are extended and expanded in a plane by bonding means such as an adhesive or heating and fusion means. A partition wall 3 integrally rises from the sheet 2, and one block 4 partitioned on the base sheet 2 surface by the partition wall 3 assembled in a rectangular shape in plan view, for example, a square.
Is formed, and the rectangular partition wall 3 is formed on the base sheet 2.
It is spread in a lattice shape with a connected state on the surface.

A cushion sheet 5, for example, a nonwoven fabric sheet or a resin independent foam sheet, is installed in one block 4 assembled by the partition wall 3, and an upper sheet 6 is provided for each block 4, and a peripheral portion thereof is provided. Is bonded to the partition wall 3 by means of, for example, an adhesive using an adhesive or a heat fusion bonding means while maintaining water tightness. The base sheet 2, the partition wall 3 and the upper sheet 6 assembled in a square form the inside thereof. A group of sealed blocks accommodating the cushion sheet 5 is connected to each other while sharing the partition wall 3 with each other,
It spreads out planarly and the vast impermeable sheet 1 is formed.

FIG. 3 is a view corresponding to FIG. 2 showing another embodiment. The upper end of the partition wall 3 of the above embodiment, which stands up from the base sheet 2 and is assembled in a square shape, is provided in both horizontal directions. Overhanging flanges 7 are formed integrally with the partition wall 3, and the cushion sheet 5 is similarly accommodated in the partition wall which is assembled in a rectangular shape and defines one block 4, and covers the cushion sheet 5. In the form, a strip-shaped upper sheet 6 is bonded to the flange 7 portion by means of bonding or heat fusion using the flange 7, and also a large shielding that spreads out in a plane by the connection of the hermetically sealed blocks. The water sheet 1 is formed.

In order to describe the construction using the seepage control sheet 1 having the above-described structure, the seepage control sheet 1 is used for a rough reservoir in which sharp protrusions such as stumps and roots of felled trees remain. When laying on the bottom surface, first, a reinforcing sheet having a cushioning property, such as a nonwoven fabric sheet or a resin independent foam sheet, is laid on the bottom of the reservoir, and the water-impervious sheet is layered on the surface in advance.

Further, when the present water-impervious sheet is laid on the bottom of a rough industrial waste landfill where sharp protrusions such as stumps of felled trees remain, a lower reinforcing sheet having a cushioning property on the bottom of the landfill beforehand is required. 8 is laid, and the present water-impervious sheet 1 is layered on the surface thereof, and the upper reinforcing sheet 9 having cushioning properties is layered on the entire surface thereof (see FIG. 4).

When the bottom surface of the industrial waste landfill is sufficiently flattened by laying concrete or laying it, laying the waterproof sheet directly on the surface of the landfill, An upper reinforcing sheet having cushioning properties is layered on the entire surface.

[0026]

The most severe situation in the use of the water-impervious sheet is that the sheet is laid on the bottom surface of an industrial waste landfill, but the upper sheet and the base sheet according to the present invention are not used. In the case of a water-impervious sheet with a layered sheet structure, the direct load of discarded material is received by the upper sheet, and the base sheet is used for various causes of sheet damage acting from the bottom of the landfill, By coping with this, it is possible to prevent the occurrence of fatal damage to the impermeable sheet by sharing the two sheets.

The structure of the water-impervious sheet The damage generated on the upper and lower sheet materials can be prevented from being transmitted to the other sheet by the cushion sheet interposed between the two sheet-constituting materials. It greatly contributes to durability and life extension.

The partial load on the impermeable sheet and the damage of the sheet caused by the partial load are caused by the independence of each block of the impermeable sheet formed by the existence of the partition wall between the pair of upper and lower sheet components. The spread of the damaged portion to the sheet can be processed block by block, and the spread of the damage of the impermeable sheet can be effectively prevented within the minimum limited block.

Further, due to local uneven settlement on the bottom of the landfill, unevenness of the bottom caused by poor leveling, or local weight change of discarded waste, a part of the impermeable sheet is partially wavy. The partial expansion and compression generated on the upper sheet portion or the base sheet portion due to the deformation in the shape of the upper portion or the base sheet portion, the peripheral partition wall around the deformed portion is inclinedly deformed, and the elongation stress of each sheet portion is reduced by the partition wall. By sharing and absorbing a part of the sheet, it is possible to prevent the risk of partial breakage of the sheet due to local elongation of the impermeable sheet.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of a part of a water impermeable sheet embodying the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line AA of FIG.

FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment.

FIG. 4 is a cross-sectional view showing an example of a construction structure using the present water-impervious sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Waterproof sheet 2 Base sheet 3 Partition wall 4 Block 5 Cushion sheet 6 Upper sheet 7 Flange 8 Lower reinforcing sheet 9 Upper reinforcing sheet

Claims (4)

[Claims] 1. A base sheet and an upper sheet disposed above the base sheet are connected between the two sheets by a partition wall assembled in a lattice shape in plan view, and a hermetic seal formed by the two sheets and the partition wall. A waterproof sheet in which a cushion sheet is installed for each block that maintains its properties, and this group of blocks is expanded and connected in a planar manner. 2. A base sheet portion is provided on a lower surface side of a cushion sheet, an upper sheet portion is provided on an upper surface side, and a whole peripheral portion of the cushion sheet is provided on a partition wall connecting the base sheet portion and the upper sheet portion. A water-blocking sheet that forms a single block by enclosing it in a sealed manner, and the block extends in a planar manner while sharing a partition wall between adjacent blocks of the same configuration. 3. A construction structure of a water-impervious sheet, wherein a reinforcing sheet having cushioning properties is arranged on at least one of the front and back surfaces of the water-impervious sheet according to claim 1. 4. A construction structure of a water-impervious sheet, wherein a reinforcing sheet having cushioning properties is disposed on at least one of the front and back surfaces of the water-impervious sheet according to claim 2.