JPH07310331A - Execution structure of impermeable sheet for civil engineering - Google Patents

Abstract

PURPOSE:To prevent the generation of looseness in a sheet on the face of a slope and the generation of damage by the front end, etc., of rock, to enable laying even on the face of a steep slope and to lay the sheet along a foundation sufficiently even when the bottom settles. CONSTITUTION:In execution structure, in which an impermeable sheet for civil engineering is laid on the surface of a foundation 1 with a face of a slope 2 and a base 3, the impermeable sheet 6 for the face of the slope, in which a base material 4 is buried into an impermeable membrane 5, is laid on the face of the slope 2. An impermeable sheet 7 for the bottom 3 consisting of only the impermeable membrane is laid on the bottom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction structure of a waterproof sheet for civil engineering which is constructed in a reservoir, a regulating pond, a park pond, a waste liquid treatment pond, a general waste disposal site, a landfill site and the like.

[0002]

2. Description of the Related Art Conventionally, harmful substances and polluted liquids from reservoirs, regulating ponds, park ponds, etc. where water has to be stored, waste liquid treatment ponds, general waste disposal sites, etc. have leached out to the ground and If necessary, water barriers must be installed to prevent contamination of water bodies and groundwater. One of the water-blocking works is a surface water-blocking work, which is a water-blocking work that is generally performed when the water permeability of the base is large and a contaminant or the like can easily leach into the base. Surface water-blocking is a method of covering the entire base consisting of slopes and bottom with a water-blocking film.As the material for the water-blocking film, a sheet method made of rubber or other elastomer, a method of spraying material, clay or There are earth lining method that compacts loamy soil and lining method using soil cement or asphalt.

[0003]

When water is blocked at a waste disposal site or a place with a slope and a bottom such as a regulating pond, the situation is different between the slope and the bottom, and the physical properties peculiar to each surface It may be necessary to use water-impervious materials with. Since the bottom surface of the ground is filled with soil to reduce unevenness, there is less of a problem that the water-impervious material will break due to the unevenness of the ground, but after applying water-shielding work. In some cases, the base material on the bottom may sink, and the sinking causes the water-impermeable sheet to be stretched, causing cracks and water leakage. In particular, when a base material such as a woven fabric having a low elasticity is embedded in order to prevent the stretch of the sheet, when the base material is partially cut, the base material is cut. It is weak against elongation and it is necessary to allow elongation only by the stretchability of the water-impervious sheet in that part, so it can be said that cracks are more likely to occur.

On the other hand, in the case of laying on the slope, since the sheet laid on the slope is laid on the slope in an oblique direction, a stretching force is always applied, but a stretchable sheet is used. On the contrary, if it is stretched, it has the disadvantage that it has a slack in the part near the bottom of the sheet, and if the ground is not well prepared, it may be due to the tip of rocks, plants, soil small animals, etc. It may crack and break, which may cause water leakage. In addition, where the slope is particularly steep, it cannot be laid due to the problem of elongation, and in the case of a water shield using a water shield sheet, as shown in FIG. Was inevitably gradual, the area of the bottom surface 13 was reduced, and the volume was inevitably reduced in spite of the occupied area. The present invention is
It solves the above problems and does not cause slack on the slope sheet or damage due to rock tips, etc., and it can be laid on steep slopes, and the bottom surface The purpose of the present invention is to provide a construction structure for a water-blocking work that can sufficiently follow the ground even if it sinks.

[0005]

The feature of the present invention resides in that in a construction structure in which a waterproof sheet for civil engineering is laid on a ground having a slope and a bottom surface, the slope has a waterproof film in the base. This is a construction structure of a waterproof sheet for civil engineering, which is characterized by laying a waterproof sheet with buried material and laying a sheet consisting of a waterproof film only on the bottom surface. In addition, vulcanized rubber and thermoplastic resin can be cited as materials for forming the water-blocking film.

[0006]

According to the present invention, in a construction structure in which a waterproof sheet for civil engineering is laid on a base having a slope and a bottom surface, a waterproof sheet having a base material embedded in a waterproof film is laid on the slope. As a result, the water-impervious sheet does not stretch, and even if it is laid on a steep slope, the sheet is unlikely to loosen, and it has excellent impact resistance and tear resistance. And since a sheet consisting of only a water-blocking film is laid on the bottom surface,
Even when the soil that you put in for leveling has subsided,
The stretchability of the entire sheet allows for elongation, and since it can conform to the submerged substrate, the sheet does not tear.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of a water barrier constructed by the construction structure of the present invention, and FIG. 2 is a water barrier for slopes used for laying on a slope in the present invention. FIG. 3 is a cross-sectional view of the sheet, and FIG. 3 is a cross-sectional view of the bottom impermeable sheet used for laying on the bottom. The groundwork 1 is a waste disposal site in a landfill, and has a space surrounded by a slope 2 and a bottom surface 3 on all sides, and is used for carrying wastes and stacking and burying the wastes in this space. is there. On the slope 2 of the slopes 2 and the bottom face 3, a slope waterproof sheet 6 having a base material 4 embedded in a waterproof membrane 5 as shown in FIG. 2 is laid.
The bottom surface 3 is provided with a bottom surface waterproof sheet 7 shown in FIG. 3, and is joined to the slope surface waterproof sheet 6 of the slope 2 at an end portion.

The slope water shield sheet 6 laid on the slope 2 has a reinforcing base material 4 embedded in a water shield film 5, and the base material 4 imparts tear resistance to the water shield sheet. In order to increase impact resistance, polyethylene, polyester, polyvinyl chloride, polypropylene, polyamide, aromatic polyamide, are used as the material.
Films made of organic synthetic resins such as polyvinyl alcohol and polyurethane, and knitting or weaving yarns or flat tapes made of synthetic resins in the same manner, or simply crossing and heat-sealing overlapping portions to form a net shape, Further, a net formed of a coarse non-woven fabric, a woven fabric made of inorganic fibers such as glass fibers, and metal fibers may also be used.

The water-blocking film 5 in which the base material 4 is embedded is ethylene / propylene / terpolymer, butyl rubber, chloroprene rubber, nitrile rubber, styrene butadiene rubber,
It is made of vulcanized rubber such as chlorosulfonated polyethylene, or thermoplastic resin such as polyvinyl chloride resin, chlorinated polyethylene resin, ethylene vinyl acetate resin, and polyethylene resin. Then, the base material 4 is embedded in the water-impervious film 5 so that no void portion is formed, to obtain a slope-impermeable water sheet.

The water barrier sheet 6 for slopes has a thickness of 0.8 to
If the thickness is less than 0.8 mm and the thickness is less than 0.8 mm, the water-blocking film 5 covering the base material 4 is too thin, resulting in poor impact resistance. If the thickness exceeds 3.0 mm, the sheets are joined together. This is not preferable because the step becomes large at the part. As described above, since the water blocking sheet in which the base material is embedded is laid on the slope 2, the slope of the slope 2 can be made steeper than the slope of the conventional slope 12, as shown in FIG. A large volume can be secured in the shaded area.

The bottom water-blocking sheet 7 laid on the bottom surface 3 is a sheet consisting only of the water-blocking film 8. The water-blocking film 8 is made of ethylene / propylene / terpolymer, butyl rubber, chloroprene rubber, nitrile rubber, styrene-butadiene rubber. It is made of vulcanized rubber such as chlorosulfonated polyethylene, or thermoplastic resin such as polyvinyl chloride resin, chlorinated polyethylene resin, ethylene vinyl acetate resin, and polyethylene resin. Its thickness is 0.8-3.0 m
If the thickness is less than 0.8 mm and the thickness is less than 0.8 mm, the water-blocking film 5 covering the base material 4 is too thin, resulting in inferior impact resistance. The step becomes large, which is not preferable.

The water barrier sheet 6 for slopes laid on the slope 2 and the water shield sheet 7 for bottoms laid on the bottom surface 3 are joined together. Membrane 5,
When vulcanized rubber is used as 8, the cure tape 9 is interposed in the lap portion between the slope water shield sheet 6 and the bottom water shield sheet 7 in an unvulcanized state, and heated and pressed to crosslink and join. A method, a method of joining using an adhesive such as a rubber type or an olefin type, and a method of performing heat fusion with an olefin type thermoplastic resin interposed therebetween are used. Further, when the water blocking films 5 and 8 are made of a thermoplastic resin, a method of hot air fusion, heat fusion, or liquid welding is used.

The physical properties of the sloped impermeable sheet 6 used in the present invention are such that the tensile performance is such that the tensile strength at 30% elongation is 5 kg.
It is preferable that the elongation at break is 200% or more and the tear performance is a tear strength of 5 kgf / cm or more at f / cm or more. Further, it is preferable that the water impermeable sheet 7 for the bottom surface has a 300% modulus of 50 to 100 kgf / cm ² and an elongation at break of 450% or more. In addition, the value of tensile performance is 50% in accordance with JIS K 6301.
0 mm / min, the test piece is JIS 1
No. 3 dumbbells and bottom water-blocking sheet were measured using JIS No. 3 dumbbells, and the tear performance value was JIS K
According to 6301, the tensile speed is 500 mm / min, and the test piece is a JIS B type dumbbell.

(Experimental Example) The stretching property and impact resistance of the water-impermeable sheet in which the base material 4 used as the slope water-impermeable sheet 6 is embedded were examined. As an example, a plain weave using polyester fiber in a vulcanized rubber sheet of ethylene / propylene / terpolymer, (500 ^D × 500 ^D ) / (30 ×
A sheet having a thickness of 1.5 mm in which a base material (30/5 cm) was embedded was used. As a comparative example, a sheet having the same material and the same thickness as that of the example except that the base material is not embedded was used. Elongation property is based on JIS K 6301. The test piece uses JIS No. 1 dumbbell and the tensile speed is 500 mm.
/ Min was measured. A graph in which stress is plotted against elongation of both is shown in FIG.

Furthermore, regarding impact resistance, both sheets of the example and the comparative example were placed on an iron plate respectively, and a load of 8.3 kg with a 0.5R blade at the tip was dropped to prevent the sheets from breaking. I checked the height. The results are shown in Table 1.

[0016]

[Table 1]

As described above, the water barrier sheet for slopes used according to the present invention exhibits the initial reinforcing performance of the base material at the time of low elongation and, after cutting the base material, has a high elongation characteristic of vulcanized rubber. It can be seen that it has performance. Also,
It can be seen that the base material also has a reinforcing effect on impact.

[0018]

As described above, according to the present invention, there is no slope in the construction structure of the waterproof sheet for civil engineering which is constructed in a reservoir, a regulating reservoir, a park reservoir, a waste liquid treatment reservoir, a general waste disposal site, a landfill site, etc. Since the water-impervious sheet in which the base material for reinforcement is embedded is laid, it has excellent tear resistance and impact resistance, so the sheet laid on the conventional slope has a slope. It is possible to solve the problem that the sheet is pulled by the action of gravity in the extending direction and cracked by being stretched, or that the sheet is cracked by impact. In addition, the bottom surface uses a water-blocking sheet that does not contain a base material, and even if the backfill that has been backfilled for leveling sinks over time, the stretchability of the entire water-blocking sheet follows the deformation of the base. It does not crack.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a construction structure of a waterproof sheet according to the present invention.

FIG. 2 is a cross-sectional view of a slope impermeable sheet that is laid on a slope in the construction structure of the impermeable sheet of the present invention.

FIG. 3 is a cross-sectional view of the waterproof sheet laid on the bottom surface in the waterproof sheet construction structure of the present invention.

FIG. 4 is a cross-sectional view showing a joint structure of a water barrier sheet for slopes and a water barrier sheet.

FIG. 5 is a cross-sectional view showing a construction structure of a conventional waterproof sheet.

[Explanation of symbols]

 1 Base 2 Slope 3 Bottom 4 Base Material 5 Water Shield Film 6 Water Shield Sheet for Slope 7 Water Shield Sheet for Bottom 8 Water Shield Film 9 Cure Tape 11 Base 12 Slope 13 Bottom

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

The bottom water-blocking sheet 7 laid on the bottom surface 3 is a sheet consisting only of the water-blocking film 8. The water-blocking film 8 is made of ethylene / propylene / terpolymer, butyl rubber, chloroprene rubber, nitrile rubber, styrene-butadiene rubber. It is made of vulcanized rubber such as chlorosulfonated polyethylene, or thermoplastic resin such as polyvinyl chloride resin, chlorinated polyethylene resin, ethylene vinyl acetate resin, and polyethylene resin. Its thickness is 0.8-3.0 m
If the thickness is less than 0.8 mm, the water-blocking film 5 will be too thin and the impact resistance will be inferior.
If it exceeds, the step becomes large at the joint between the sheets, which is not preferable.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

FIG. 4 is a graph showing the relationship between the elongation of the water barrier sheet for slopes and the water shield sheet for bottom surfaces with respect to stress. ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a construction structure of a waterproof sheet according to the present invention.

FIG. 2 is a cross-sectional view of a slope impermeable sheet that is laid on a slope in the construction structure of the impermeable sheet of the present invention.

FIG. 3 is a cross-sectional view of the waterproof sheet laid on the bottom surface in the waterproof sheet construction structure of the present invention.

FIG. 4 is a cross-sectional view showing a joint structure of a water barrier sheet for slopes and a water barrier sheet.

FIG. 5 is a cross-sectional view showing a construction structure of a conventional waterproof sheet.

FIG. 6 is a graph comparing stress against elongation of a sheet with a substrate and a sheet without a substrate.

[Explanation of symbols] 1 Base 2 Slope 3 Bottom 4 Base material 5 Water impermeable film 6 Water impermeable sheet for slope 7 Water impermeable sheet for bottom 8 Water impermeable film 9 Cure tape 11 Base 12 Slope 13 Bottom

Claims (3)

[Claims] 1. A construction structure in which a waterproof sheet for civil engineering is laid on a base having a slope and a bottom surface, and a waterproof sheet for slopes in which a base material is embedded in a waterproof film is laid on the slope. The construction structure of the waterproof sheet for civil engineering, which is characterized in that a waterproof sheet for the bottom consisting of only a waterproof film is laid on the bottom. 2. The construction structure of the water blocking sheet for civil engineering according to claim 1, wherein the water blocking film is a thermoplastic resin. 3. The construction structure of the water blocking sheet for civil engineering according to claim 1, wherein the water blocking film is vulcanized rubber.