JP2001239228A - Draining/sealing structure and draining/sealing method in waste disposal site - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure for imparting high strength and high sealing property when joining both of a liner sheet placed on a waste disposal site and a drainage pipe penetrating through the liner sheet the each other. SOLUTION: The draining/sealing structure in the waste disposal site is composed of the liner sheet buried underground to intercept water in the inside and the outside of the waste disposal site, the polyethylene resin-made drainage pipe penetrating through the liner sheet and extending to the outside from the inside of the waste disposal site through the underground, a pair of coating film layers composed of an adhesive applied on the inner peripheral surface of the through-hole of the liner sheet and the outer peripheral surface of the drainage pipe opposed to the inner peripheral surface and consisting essentially of a polyolefin based resin and a joining layer interposed between the coating film layers and for joining the drainage pipe and the liner sheet to each other to enable to intercept water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage / water-blocking structure for a waste disposal site, and more particularly, to a water-blocking sheet buried in soil to block water inside and outside a waste disposal site. And a drainage pipe made of a polyethylene resin that penetrates a water-impervious sheet from inside the waste disposal site and extends through the soil to the outside of the waste disposal site.

[0002]

2. Description of the Related Art Recently,
Waste disposal sites are increasingly adopting advanced water leakage prevention / leakage detection methods, such as the use of water leakage sensors, as environmental problems increase. Conventionally, waste disposal sites have buried water-impervious sheets along the inside and outside boundaries of the waste disposal site to suppress contact between the waste and the outside world. In general, a method using a mortar stopper, a band stopper, or the like is applied to a joint surface between a pipe body for draining water and a water-blocking sheet. In addition, a polyethylene pipe having excellent durability is often used for the drain pipe, and this polyethylene has a problem that an appropriate adhesive for adhering to the waterproof sheet is not found.

However, with such a simple method, it is difficult to perform stable water stoppage for a long period of time, because the adhesion between the pipe and the impermeable sheet becomes insufficient or deterioration due to aging occurs. There was a problem that this resulted in groundwater contamination and odor emission.

Therefore, one of the objects of the present invention is to join a waterproofing sheet laid at a waste disposal site with a polyethylene resin drain pipe penetrating the waterproofing sheet, and to provide a high strength joint to the joint. Another object of the present invention is to provide a joining method in which work is completed by simple welding of the impermeable sheets in a disposal site.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and has a water-impervious sheet buried in soil to block water inside and outside a waste disposal site. A polyethylene resin drainage pipe extending from the waste disposal site to the outside of the waste disposal site through the water-impervious sheet, and facing the inner peripheral surface of the through-hole of the water-impervious sheet through which the drainage tube penetrates and the inner peripheral surface A pair of coating layers composed of an adhesive mainly composed of a polyolefin resin, which are respectively coated on the outer peripheral surface of the drainage pipe, are bonded to each other, and the drainage pipe and the impermeable sheet are joined so as to be impermeable to water. Provide a drainage and impermeable structure for a waste disposal site consisting of a bonding layer. That is, the gist of the present invention is:
Specifically, a polyolefin-based adhesive is applied with a certain width or more to the outer peripheral surface of a polyethylene extruded pipe as a drain pipe, while the drain pipe easily penetrates a waterproof sheet used in a disposal site or the like. After applying a polyolefin adhesive in the same manner as the drain pipe, when joining the waterproof sheet and the drain pipe, use an adhesive between the coating layers and use a band etc. if necessary, It is intended to physically provide the joint with high strength and high waterproofness. In addition, the present invention provides a simple and highly reliable method of joining a water-impervious sheet and a drain pipe, the operation of which is completed by welding a water-impervious sheet at a disposal site.

As the drainage pipe used in the present invention, a polyethylene resin pipe is used, and is not particularly limited. The drainage pipe is of various types having high durability and excellent in durability, and guarantees the watertightness of the connection portion of the pipe body. Are preferred. The impermeable sheet used in the present invention is not particularly limited as long as it is a soft synthetic resin or rubber-based one that is generally used in a waste disposal site, but has excellent workability, safety, and water impermeability. Are particularly preferred. Specifically, ethylene / vinyl acetate copolymer, polyethylene resin, blend of olefin resin and rubber or soft polyvinyl chloride resin as a soft synthetic resin, urethane rubber, ethylene / propylene / diene based as a rubber Rubber and butyl rubber are each preferred. The structure of the water-impervious sheet is not limited to one having one or more layers laminated, but may be a sheet having a double composition in which two substrates are connected by a large number of ribs.

[0007] The polyolefin-based adhesive according to the present invention comprises at least the inner peripheral surface (usually, a through hole) of the water-impervious sheet.
It is applied to the outer peripheral surface of the drainage pipe and the outer peripheral surface of the drainage pipe, respectively. Specifically, for example, an adhesive (SKIP66 “Sotec Co., Ltd. Made by company "
Etc.) are preferably used.

[0008] In the present invention, the adhesive used between the obtained coating layers may be an ordinary resin such as an epoxy resin, a urethane resin, an ethylene / vinyl acetate copolymer (EVA) acrylic resin, or a rubber adhesive. Can be used. In the present invention, the impermeable sheet is
The inner peripheral surface of the through hole is further provided with a bent edge along the outer peripheral surface of the polyethylene resin drain pipe, which increases the joint area between the impermeable sheet and the drain pipe, thereby more securely connecting the two. Is preferable. Further, when the bent edge portion of the impermeable sheet is tightened from the periphery with a band, the connection can be further ensured. The band is not particularly limited as long as it can be fastened so that the impermeable sheet can be tightly adhered to the drain pipe, but a band having long-term durability is preferable.

According to another aspect of the present invention, there is provided a water-impervious sheet buried in the soil for intercepting water inside and outside a waste disposal site, and a sheet penetrating the water-impervious sheet from inside the waste disposal site. When water-tightly joins a polyethylene resin drain pipe that extends through the soil to the outside of the waste disposal site, the drain pipe penetrates the inner peripheral surface of the water-permeable sheet through-hole and drainage that faces this inner peripheral surface. Provided is a method for draining and impermeable water in a waste disposal site, in which an outer peripheral surface of a pipe is coated with an adhesive mainly composed of a polyolefin resin, and then these coating layers are joined with the adhesive.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. This does not limit the present invention. FIG. 1 is a schematic perspective view showing one embodiment of a drainage / water impermeable structure of a waste disposal site according to the present invention, particularly showing a joint between a water impermeable sheet piece and a drain pipe, and FIG. It is a cross-sectional view of a part. 1 and 2, a drainage / water-blocking structure 1 of a waste disposal site includes a polyethylene drain pipe 2, a polyurethane water-blocking sheet piece 3, an adhesive layer 4 between the drain pipe 2 and the water-blocking sheet piece 3, and a band. Mainly from 5.

The adhesive layer 4 has a coating layer (primer layer) 6 a formed on the outer peripheral surface of the drain pipe 2 using a polyolefin resin adhesive, and an inner peripheral surface of the through hole 9 of the water-blocking sheet piece 3. A coating layer (primer layer) 6b formed on the inner and outer peripheral surfaces of the bent edge portion 9a including the sheet using a polyolefin resin adhesive for sheets. The covering layer 6a and the bent edge 9
The bonding layer 8 made of an epoxy resin adhesive is integrally formed between the inner peripheral surface of the coating layer 6a and the outer peripheral surface of the outer peripheral covering layer 6b.

Since it is difficult to directly join the drain pipe 2 and the impermeable sheet piece 3 because of the material, the coating layers 6a and 6b are formed in advance, so that both the coating layers 6a and 6b are formed.
The drain pipe 2 can be formed simply by forming a simple joining layer between
A drainage / water-blocking structure in which the water-blocking sheet pieces 3 are securely and liquid-tightly joined to each other is obtained.

Hereinafter, a method of constructing a drainage / water shielding structure of a waste disposal site comprising the adhesive layer 4, the drain pipe 2 and the water shielding sheet piece 3 will be described in detail. 3 is a perspective view showing a step of applying a polyolefin adhesive to the drain pipe 2, FIG. 4 is a perspective view showing a step of heating the applied layer, and FIG. 5 is a perspective view of a water-blocking sheet having through holes. 6 is a perspective view of a water-blocking sheet showing a step of applying a polyolefin-based adhesive to the periphery of the through-hole, and FIG. 7 is a perspective view of the water-blocking sheet showing a step of heating the coating layer.

First, as shown in FIG. 3, a polyolefin-based adhesive was applied as a primer to the outer peripheral surface of the drain pipe 2 in a required width in order to impart adhesiveness to polyethylene, which is considered to be difficult to adhere. The adhesive is heated by a hot gun 7 as shown in FIG. 4 to form a coating layer 6a.

On the other hand, as shown in FIG. 5, the water-permeable sheet piece 3 has a through hole 9 having a bent edge 9a for penetrating the drain pipe 2. In this case, too, it is difficult to adhere due to the characteristics of the polyurethane material. Therefore, as shown in FIG. 6, a polyolefin adhesive is applied to the through-hole 9 including the inner and outer peripheral surfaces of the bent edge portion 9a in a required width. Then, as shown in FIG. 7, the coating layer 6b is formed by heating with a hot gun 7.

Thereafter, as shown in FIG. 2, the drainage pipe 2 is passed through the pretreated water-blocking sheet piece 3, and a bonding layer 8 made of an adhesive such as epoxy resin is interposed between the two. Then, as shown in FIG. 1, the band 5 is
By winding from above a and leaving it to stand for 24 hours, the joint between the water-blocking sheet piece 3 and the drain pipe 2 can be integrated. In the operation of the waste disposal site, as shown in FIG. 8, the drainage / water shielding structure 1 is placed on a water-permeable sheet 3a with a mouth-shaped hole that has been buried in advance by a generally used method. By appropriately welding the water-blocking sheet piece 3 and the water-blocking sheet 3a,
Join without leakage.

[0017] A tensile strength test and a water leak test of the joint obtained by the above-described joining method were performed. As for the tensile strength, no abnormality was confirmed even when the impermeable sheet was stretched. Was left at 5M head for 24 hours, but no water leakage was confirmed. For comparison, the water stopping performance of the conventional joining method was measured, but water could not be stopped at all.

The details of each test result are as follows. FIG. 9 is a cross-sectional view showing a bonding structure used in the test,
FIG. 10 is an explanatory view showing a state of a bending test, and FIG. 11 is an explanatory view showing a watertight test piece. Test results

[0019]

[Table 1]

Remarks: Required joint strength 80 N / cm In FIG. 9, 10: polyurethane sheet (2.5 mm),
11: primer layer (0.4 mm), 12: epoxy resin (1.0 mm), 13: primer layer (0.4 mm), 14: polyethylene sheet (2.5 mm)

[0021]

[Table 2]

[0022]

[Table 3]

C) Deflection test • Specimen Polyethylene pipe φ70 mm Test method: Using the specimen shown in FIG. 10, compressing the bonded portion, and visually confirming the occurrence of cracks.

[0024]

[Table 4]

D) Water tightness test (see FIG. 11) Specimen Polyethylene pipe φ300 mm Test method: Left for 24 hours under a water head of 5 m (equivalent to 0.05 Mpa). Test result: no change in water level after 24 hours

From the above results, it is considered that there is no problem in the strength and watertightness of the joint.

[0027]

According to the joint structure of the impermeable sheet and the drainage pipe having the above-described structure, the impermeable sheet and the drainage pipe are chemically and physically joined, so that the rainwater or the like accumulated in the disposal site can be removed. Water does not leak from the joint to the outside, and water is stopped for a long time.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory perspective view showing one embodiment of a drainage / water shielding structure of a waste disposal site according to the present invention.

FIG. 2 is a side view of the joint of FIG. 1;

FIG. 3 is a perspective view showing a step of obtaining a drainage / water shielding structure of a waste disposal site according to the present invention.

FIG. 4 is a view corresponding to FIG. 3, showing different steps.

FIG. 5 is a perspective view showing a water impermeable sheet piece before use.

FIG. 6 is a view corresponding to FIG. 3, showing different steps.

FIG. 7 is a view corresponding to FIG. 3, showing different steps.

FIG. 8 is a perspective view showing a process of attaching a drainage / water impermeable structure of a waste disposal site to a water impermeable seam at a site.

FIG. 9 is a cross-sectional view showing a bonding structure used in the test.

FIG. 10 is an explanatory diagram showing a state of a deflection test.

FIG. 11 is an explanatory view showing a watertight test piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage / water-blocking structure of a waste disposal site 2 Drain pipe 3 Water-blocking sheet piece 3a Water-blocking sheet 4 Adhesive layer 5 Band 6 Covering layer 7 Hot gun 8 Bonding layer 9 Through hole 9a Bent edge

Claims (10)

[Claims] Claims 1. A water-impervious sheet buried in the soil to block water inside and outside a waste disposal site, and a sheet penetrating the water-impervious sheet from inside the waste disposal site to the outside of the waste disposal site. A polyethylene-based resin drain pipe extending therethrough, and a polyolefin-based resin coated on the inner peripheral surface of the through hole of the impermeable sheet through which the drain pipe penetrates and the outer peripheral surface of the drain pipe facing the inner peripheral surface, respectively. A drainage / water-blocking structure for a waste disposal site, comprising a pair of coating layers made of an adhesive and a bonding layer that bonds these coating layers and bonds the drainage pipe and the water-blocking sheet in a water-blocking manner. 2. The drainage and impermeable structure of a waste disposal site according to claim 1, wherein the adhesive of the coating layer contains a styrene-butadiene block copolymer partial oxide as a sub-component thereof. 3. The bonding layer is formed of an epoxy resin, a urethane resin, an acrylic resin, an ethylene / vinyl acetate copolymer, or a rubber adhesive.
Or the drainage and impermeable structure of a waste disposal site according to 2. 4. The drainage / water shielding structure for a waste disposal site according to claim 1, wherein the water shielding sheet is formed of a soft resin or rubber. 5. The rubber of the water-impervious sheet is a urethane rubber,
The drainage and impermeable structure of a waste disposal site according to claim 4, wherein the wastewater is a ethylene-propylene-diene rubber or a butyl rubber. 6. The waste according to claim 4, wherein the soft resin of the water shielding sheet is an ethylene / vinyl acetate copolymer, a polyethylene resin, a blend of an olefin resin and rubber, or a soft polyvinyl chloride resin. Drainage and impermeable structure at the disposal site. 7. The water-impervious sheet according to claim 1, further comprising, on the inner peripheral surface of the through hole, a bent edge along the outer peripheral surface of the drainage pipe made of polyethylene resin. Drainage and impermeable structure at a waste disposal site. 8. The drainage and impermeable structure for a waste disposal site according to claim 7, further comprising a band for tightening the bent edge from the periphery. 9. The drainage sheet includes a drainage pipe penetration small area including a portion through which a polyethylene resin drainage pipe penetrates, and another large area which is water-tightly joined around the drainage pipe penetration area. The drainage and impermeable structure of a waste disposal site according to any one of 1 to 8. 10. A water-impervious sheet buried in the soil to block water inside and outside the waste disposal site, and penetrating the water-impervious sheet from inside the waste disposal site to the soil to the outside of the waste disposal site. When joining the extended polyethylene resin drain pipe so as to be water-tight, the polyolefin resin is attached to the inner peripheral surface of the through hole of the water-permeable sheet through which the drain pipe penetrates and the outer peripheral surface of the drain pipe facing this inner peripheral surface. A method for draining and impermeable water at a waste disposal site, in which an adhesive mainly composed of a material is coated, and then these coating layers are bonded with the adhesive.