JP2002102817A - Bonding structure of water shielding sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bonding structure of a water shielding sheet that occurs less leakage of water even if it is subjected to large deformation. SOLUTION: A seepage control sheet 15a, 15b, which is picked up and bonded, is caulked by fitting a mechanical joint 25. Further, a protector made of plastics and the like is covered on an upside impressing electrode 17 and an upside non-woven fabric 19. When the seepage control sheet is subjected to tensile force, the end of the seepage control sheet part 7 is moved so that it can be followed by the large deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for joining water-impervious sheets.

[0002]

2. Description of the Related Art Conventionally, various construction methods have been proposed and put into practical use for a water shielding structure of a waste disposal site. For example,
Excavate the ground, establish a water-blocking layer, a water-blocking sheet, etc., construct a water-blocking structure, and put waste into the interior.

[0003]

However, at present, there is no shortage of nearby environmental problems due to leakage of pollutants. Contaminant leakage is believed to occur as follows. As the waste is landfilled, the supporting ground of the disposal site, including the impermeable layer, undergoes consolidation settlement due to the load of the above-mentioned waste, and the impermeable layer and impermeable sheet receive a large tensile force, and A large displacement occurs in the water sheet, causing cracks and cracks, and leaks from the cracks.

[0004] The present invention has been made in view of such problems, and an object of the present invention is to provide a joint structure of a water-blocking sheet that hardly leaks liquid even when it is deformed.

[0005]

According to a first aspect of the present invention, there is provided a first water-impervious sheet portion having a first central member and a second water-impervious sheet portion having a second central member. In the adjacent portion where the water sheet portion is arranged so as to be adjacent, the first central member and the second central member are picked up and a joint is provided so that the back sides are in contact with each other. It is a joint structure of the impermeable sheet. In the first invention, the joint is provided by picking up the first central member and the second central member. Therefore, even if a tensile force is applied, it is relaxed at this portion.

[0006] A second aspect of the present invention is a first aspect of the present invention, comprising a first center member having a first central member.
In the adjacent portion where the water impermeable sheet portion and the second water impermeable sheet portion having the second central material are arranged adjacent to each other, the first central material and the second central material are picked up. This is a joint structure of a water-blocking sheet, wherein a joint is provided so that the back sides are in contact with each other and wound around a rod-shaped member. In the second invention, the first center member and the second center member are picked up, provided with a joint, and wound around a rod-shaped member. Therefore, even if a tensile force is applied, it is relaxed at this portion.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view of the waste disposal site 1, and shows a half of the cross section of the waste disposal site 1. As shown in FIG. 1, a waste disposal site 1 for reclaiming waste 3 is constructed as follows.

[0008] The support ground 2 is excavated to provide the impermeable layer 9,
The impermeable sheet portion 7 is spread, and the protective soil layer 5 is provided on the impermeable sheet portion 7. The protective soil layer 5, the waterproof sheet section 7, and the waterproof layer 9 constitute the waterproof structure 4. Then, the waste 3 is put into the upper part of the protective soil layer 5. The water impervious structure 4 ensures that the waste disposal site 1 is impervious to water and prevents liquid leakage from the waste disposal site 1.

The impermeable layer 9 is made of a material obtained by adding a solidifying material such as cement to a locally generated soil, and is a poorly permeable base having excellent water resistance and impact resistance. Further, since the water-impervious layer 9 has a sufficient supporting force and a smooth surface, it protects the water-impervious sheet section 7 as a base material for the water-impervious sheet section 7 in contact with the upper surface.

The water-blocking sheet section 7 is a sheet having a high water-honey property. This impermeable sheet portion 7 will be described later. The protective soil layer 5 is made of a stabilized soil having an appropriate strength by improving cement or the like. This protective soil layer 5 protects the impermeable sheet portion 7.

Next, the impermeable sheet section 7 will be described.
FIG. 2 is a diagram showing a method of joining the water-impervious sheet 15 constituting the water-impervious sheet section 7. As shown in FIG. 2, the impermeable sheet 15 constituting the impermeable sheet portion 7 has a substantially square shape with one side of about 5 m, and is stretched in the A direction and the B direction. Then, a tensile force acts in the A direction.

The expansion / contraction adjustment portion 13a, which is a portion of the waterproof sheet 15 that is a stretch, is orthogonal to the direction A in which the tensile force acts, and is joined by a stretch method that extends with respect to the tensile force, as described later. Is done. The overlap-attaching portion 11 which is a joining portion of the water-blocking sheet 15 is parallel to the direction A, and the water-blocking sheets 15 are overlapped and stuck by an adhesive or heat welding.

Next, the expansion / contraction adjusting section 13a, which is a fitting section of the impermeable sheet section 7, will be described. FIG. 3 is a cross-sectional view of the water-impervious sheet section 7, and FIG. 4 is a cross-sectional view of the vicinity of the expansion / contraction section 13 a of the water-impervious sheet section 7.

As shown in FIG. 3, the impermeable sheet portion 7 is provided between the impermeable layer 9 and the protective soil layer 5. Impermeable sheet part 7
The upper application electrode 17 is provided on the upper surface of the water impermeable sheet 15 as a center material, the upper nonwoven fabric 19 is provided on the upper surface of the upper application electrode 17, and the lower nonwoven fabric 21 is provided on the lower surface of the water impermeable sheet 15. The lower application electrode 23 is provided on the lower surface of the nonwoven fabric 21. When the impermeable sheet part 7 is installed on the impermeable layer 9, the lower applied electrode 23 and the lower nonwoven fabric 2 are disposed on the impermeable layer 9.
1, water impermeable sheet 15, upper applied electrode 17, upper nonwoven fabric 1
We spread 9 each locally.

The upper applied electrode 17 and the lower applied electrode 23 are connected to the upper applied electrode 1 when the waterproof sheet 15 is damaged.
It is provided to detect that the impermeable sheet 15 is damaged by sensing the current or voltage flowing from 7 to the lower application electrode 23. In addition, as the water shielding sheet 15, a heat-caustic polyurethane sheet or the like is used. Further, instead of the lower nonwoven fabric 21, a rubber asphalt sheet having high water impermeability may be used.

As shown in FIG. 4, the expansion / contraction adjusting portion 13a, which is a portion where the water-impervious sheet 15 is fitted, is provided with a water-impervious sheet 15a.
And the end of the impermeable sheet 15b are picked up, and the back sides of the impermeable sheet 15a and the impermeable sheet 15b are aligned,
Laminate with adhesive or heat welding. The water-impervious sheet 15a and the water-impervious sheet 15b are caulked by providing a mechanical joint 25 having a concave cross section made of metal such as stainless steel.

Further, the upper marking electrode 17 and the upper nonwoven fabric 19 are provided on the picked up water-blocking sheet 15a and water-blocking sheet 15b, and the mechanical joint 25, and a protector 27 made of plastic or the like is further placed thereon. Even after the protective soil layer 5 is provided on the water-impervious sheet section 7 by the protector 27, when the water-impervious sheet section 7 receives a tensile force in the A direction, the end of the water-impervious sheet section 7 is moved in the A direction. And can follow the large deformation of the water impermeable sheet portion 7 due to the tensile force.

The upper non-woven fabric 19, the lower non-woven fabric 21 and the like are joined together by overlapping at places other than the expansion / contraction adjusting section 13a. Thus, in the present embodiment, the impermeable sheet portion 7
Even if is subjected to a tensile force in the direction A, the tensile force is relaxed by the expansion / contraction adjustment portion 13a, and the water-impermeable sheet portion 7 can be prevented from being damaged.

Next, a second embodiment of the present invention will be described. FIG. 5 shows the expansion and contraction adjustment section 13 b of the water-impervious sheet section 7.
FIG. 6 is a cross-sectional view of the vicinity, and FIG. 6 is a diagram illustrating a state where a tensile force acts on FIG. In the second embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals.

As shown in FIG. 5, a lower nonwoven fabric 21 and a lower marking electrode 23 are provided on the water shielding layer 9, and a water shielding sheet 15 is provided. The expansion / contraction adjustment part 13b, which is a joint between the water-impervious sheet 15a and the water-impervious sheet 15b, picks up the end of the water-impervious sheet 15a and the end of the water-impervious sheet 15b, and
And the back side of the water-impervious sheet 15b are bonded together and glued together with an adhesive. The impermeable sheet 15a and the impermeable sheet 15b
Is provided with a mechanical joint 25 having a concave cross-sectional shape made of a metal such as stainless steel.

The water-impervious sheet 15a and the water-impervious sheet 15b, which have been closed by the mechanical joint 25, are joined to a round bar core 29 made of a flexible material such as a round bar sponge.
And wrap it around the round bar core material 29. And
An upper application electrode 17 and an upper nonwoven fabric 19 are provided above the expansion / contraction adjustment unit 13b.

FIG. 6 shows a state in which a tensile force acts on the expansion / contraction adjustment section 13b. When the tensile force acts in the direction A of the water-impervious sheet portion 7, the stress that the water-impervious sheet 15 a and the water-impervious sheet 15 b are pulled on both sides via the round bar core 29 is released.

Upper application electrode 1 above expansion / contraction adjustment unit 13b
7 and the upper non-woven fabric 19 are also provided with a margin allowance, so that the impermeable sheet portion 7 does not withstand the large deformation of about 100 to 200 mm due to the tensile force with the strength of the impermeable sheet portion 7,
It can be countered by the extensibility and flexibility of the water impermeable sheet portion 7. Also in the present embodiment, even if the impermeable sheet portion 7 receives a tensile force, the tensile force is relaxed by the expansion and contraction adjusting portion 13b, and the impermeable sheet portion 7 can be prevented from being damaged.

[0024]

As described above in detail, according to the present invention, it is possible to provide a joint structure of a water impermeable sheet which is less likely to leak even if it is deformed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a waste disposal site 1.

FIG. 2 is a view showing a method of joining a water-impervious sheet 15 constituting the water-impervious sheet section 7;

FIG. 3 is a cross-sectional view of the impermeable sheet portion 7;

FIG. 4 is a cross-sectional view of the vicinity of the expansion and contraction adjustment section 13a of the water-impervious sheet section 7.

FIG. 5 is a cross-sectional view of the vicinity of the expansion and contraction adjustment section 13b of the water-impervious sheet section 7.

FIG. 6 is a diagram showing a state where a tensile force acts on FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waste disposal site 4 ... Water-proof structure 5 ... Protective soil layer 7 ... Water-proof sheet part 9 ... Water-proof layer 13 ... Expansion adjustment part 15 ... Water-proof sheet 17 ... Upper applied electrode 19 ... Upper cloth 21 ... Lower non-woven cloth 23 ... Lower applied electrode 25 ... Mechanical joint 27 ... Protector 29 ... Round bar core

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Banno 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Hideki Wakabayashi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. F-term in Kashima Construction Co., Ltd. (reference) 2D043 DD01 4D004 AA46 AB01 BB05 BB06 DA01 DA09

Claims (5)

[Claims] A first water-impervious sheet having a first central material and a second water-impervious sheet having a second central material are arranged adjacently to each other at an adjacent portion. The joint structure of a water-impervious sheet, wherein a joint is provided so that the center member and the second center member are picked up and the back sides are in contact with each other. 2. The first waterproof sheet having a first central material and the second waterproof sheet having a second central material are arranged adjacent to each other at an adjacent portion. A joint structure for a water-impermeable sheet, comprising: picking up the center member of the above and the second center member, providing a joint so that the back sides are in contact with each other, and winding the joint around a rod-shaped member. 3. The joint structure according to claim 1, wherein the center member is a urethane sheet. 4. The bonded first water-impervious sheet and a second water-impervious sheet.
3. The joint structure of a water impermeable sheet according to claim 1, wherein another material is provided on the front and back of the water impermeable sheet. 5. The other material is an upper applied electrode and an upper nonwoven cloth provided on the front side of the center material, and a lower nonwoven cloth and a lower applied electrode provided on the back side of the center material. The joint structure for a water-impervious sheet according to claim 4.