JP4364417B2 - Impermeable sheet joining structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint structure for a water shielding sheet.
[0002]
[Prior art]
Conventionally, various construction methods have been proposed and put into practical use for the water shielding structure of a waste disposal site. For example, excavating the ground, providing a water-impervious layer, water-impervious sheet, etc. to build a water-impervious structure, and throwing waste into the interior.
[0003]
[Problems to be solved by the invention]
However, the current situation is that the environmental problems of the neighborhood due to the leakage of pollutants will not end. Contaminant leakage is thought to occur as follows. Along with the reclamation of waste, the supporting ground of the disposal site including the water-impervious layer causes consolidation settlement due to the load of the waste on top. A large displacement occurs in the water sheet, cracks and cracks occur, and liquid leaks from the cracks.
[0004]
This invention is made | formed in view of such a problem, and the place made into the objective is providing the joining structure of the water shielding sheet which hardly leaks even if it receives a deformation | transformation.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the first invention is a joining structure of a water shielding sheet portion having other materials on the front and back surfaces of a water shielding sheet as a central material at a bonding portion of the water shielding sheet. Then, on the other material on the back side, in the adjacent portion where the first water-impervious sheet and the second water-impervious sheet are arranged adjacent to each other, the end of the first water-impervious sheet; Picking up the end of the second water-impervious sheet, forming a margin so that the back sides are in contact with each other, and jointing the ends of the combined first and second water-impervious sheets And caulking the combined first and second water shielding sheets around a rod-shaped member made of a flexible material, and the upper side of the wound first and second water shielding sheets on the front side Other materials are provided, and the first and second water shielding sheets are When a tensile force in the direction of opening the bonded portion is exerted, the first and second water shielding sheets move in the direction of opening the bonded portion through the rod-shaped member, respectively, to relieve the tensile force. It is the junction structure of the characteristic water shielding sheet.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-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, the waste disposal site 1 for reclaiming the waste 3 is constructed as follows.
[0008]
The support ground 2 is excavated to provide the water-impervious layer 9, the water-impervious sheet portion 7 is spread, and the protective soil layer 5 is provided on the water-impervious sheet portion 7. The water shielding structure 4 is constituted by the protective soil layer 5, the water shielding sheet portion 7, and the water shielding layer 9. And the waste 3 is thrown into the upper part of the protective soil layer 5. FIG. The water shielding structure 4 ensures the water shielding of the waste disposal site 1 and prevents leakage from the waste disposal site 1.
[0009]
The water-impervious layer 9 is made of a material obtained by adding a solidifying material such as cement to locally generated soil, and is a hardly water-permeable base having excellent water resistance and impact resistance. Moreover, since the water-impervious layer 9 has a sufficient supporting force and the surface is smooth, the water-impervious sheet portion 7 is protected as a base material for the water-impervious sheet portion 7 in contact with the upper surface.
[0010]
The water-impervious sheet portion 7 is a sheet having a high water honey property. The water shielding sheet portion 7 will be described later.
The protective soil layer 5 is made of a stable treated soil having an appropriate strength by cement improvement or the like. This protective soil layer 5 protects the water-impervious sheet portion 7.
[0011]
Next, the water shielding sheet portion 7 will be described. FIG. 2 is a diagram illustrating a method for joining the water shielding sheets 15 constituting the water shielding sheet portion 7.
As shown in FIG. 2, the water shielding sheet 15 constituting the water shielding sheet portion 7 has a substantially square shape with one side of about 5 m, and is stretched according to the A direction and the B direction. A tensile force acts in the A direction.
[0012]
The expansion / contraction adjustment portion 13a, which is a bonding portion of the water-impervious sheet 15, is orthogonal to the A direction in which the tensile force acts, and is joined by a bonding method that extends with respect to the tensile force, as will be described later.
The overlap-bonding portion 11 that is a laminated portion of the water-impervious sheet 15 is parallel to the A direction, and the water-impervious sheet 15 is overlapped and attached by an adhesive or heat welding.
[0013]
Next, the expansion / contraction adjustment part 13a which is the mating part of the water-impervious sheet part 7 will be described.
FIG. 3 is a cross-sectional view of the water-impervious sheet portion 7, and FIG. 4 is a cross-sectional view of the vicinity of the expansion / contraction adjustment portion 13 a of the water-impervious sheet portion 7.
[0014]
As shown in FIG. 3, the water shielding sheet portion 7 is provided between the water shielding layer 9 and the protective soil layer 5. In the water-impervious sheet portion 7, an upper applied electrode 17 is provided on the upper surface of the water-impervious sheet 15 as a central material, an upper nonwoven fabric 19 is provided on the upper surface of the upper applied electrode 17, and a lower nonwoven fabric 21 is provided on the lower surface of the water-impervious sheet 15. The lower application electrode 23 is provided on the lower surface of the lower nonwoven fabric 21.
When the water shielding sheet portion 7 is installed on the water shielding layer 9, the lower application electrode 23, the lower nonwoven fabric 21, the water shielding sheet 15, the upper application electrode 17, and the upper nonwoven fabric 19 are respectively provided on the water shielding layer 9. I will continue to spread.
[0015]
When the water shielding sheet 15 is damaged, the upper application electrode 17 and the lower application electrode 23 detect the current or voltage flowing from the upper application electrode 17 to the lower application electrode 23, thereby breaking the water shielding sheet 15. It is provided to detect that it is doing.
As the water shielding sheet 15, a heat caustic polyurethane sheet or the like is also used. Further, a rubber asphalt sheet having high water impermeability may be used instead of the lower nonwoven fabric 21.
[0016]
As shown in FIG. 4, the expansion / contraction adjustment unit 13 a that is a mating portion of the water-impervious sheet 15 picks up the end of the water-impervious sheet 15 a and the end of the water-impervious sheet 15 b, The back sides of the sheet 15b are put together and bonded together with an 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.
[0017]
Furthermore, the upper marking electrode 17 and the upper nonwoven fabric 19 are provided on the picked-up water shielding sheet 15a, the water shielding sheet 15b, and the mechanical joint 25, and a protector 27 made of plastic or the like is placed thereon. Even when the protective soil layer 5 is provided on the water-impervious sheet portion 7 by the protector 27, when the water-impervious sheet portion 7 receives a tensile force in the A direction, the end portion of the water-impervious sheet portion 7 is in the A direction. And can follow the large deformation of the water-impervious sheet portion 7 due to the tensile force.
[0018]
Note that the upper nonwoven fabric 19 and the lower nonwoven fabric 21 are joined by overlapping at portions other than the expansion / contraction adjusting portion 13a.
Thus, in this Embodiment, even if the water-impervious sheet part 7 receives a tensile force in the A direction, the tensile force is relaxed by the expansion / contraction adjusting part 13a, and the water-impervious sheet part 7 can be prevented from being damaged. .
[0019]
Next, a second embodiment of the present invention will be described. FIG. 5 is a cross-sectional view of the vicinity of the expansion / contraction adjustment portion 13b of the water-impervious sheet portion 7, and FIG. 6 is a diagram illustrating a state in which a tensile force is applied to FIG. In the second embodiment, elements having the same functions as those in the first embodiment are denoted by the same reference numerals.
[0020]
As shown in FIG. 5, the lower nonwoven fabric 21 and the lower marking electrode 23 are provided on the water shielding layer 9, and the water shielding sheet 15 is provided. The expansion / contraction adjustment part 13b which is a junction part of the water-impervious sheet 15a and the water-impervious sheet 15b picks up the edge part of the water-impervious sheet 15a and the edge part of the water-impervious sheet 15b, and the water-impervious sheet 15a and the water-impervious sheet 15b. Align the back of each other and glue them together with an adhesive. A mechanical joint 25 having a concave cross-sectional shape made of metal such as stainless steel is provided at the end portions of the water-impervious sheet 15a and the water-impervious sheet 15b.
[0021]
The water-impervious sheet 15a and the water-impervious sheet 15b caulked by the mechanical joint 25 are wound around the round bar core material 29 using a round bar core material 29 made of a flexible material such as a round bar-like sponge. Put on.
And the upper application electrode 17 and the upper nonwoven fabric 19 are provided in the upper part of the expansion-contraction adjustment part 13b.
[0022]
FIG. 6 shows a state in which a tensile force is applied to the expansion / contraction adjustment portion 13b. When the tensile force acts in the A direction 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 to both sides via the round bar core material 29 is released.
[0023]
Since the upper application electrode 17 and the upper nonwoven fabric 19 and the like on the upper part of the expansion / contraction adjusting part 13b are provided with a margin, the water shielding sheet part 7 is subjected to a large deformation of about 100 to 200 mm due to a tensile force. However, it can be countered by the extensibility and flexibility of the water shielding sheet portion 7.
Even in the present embodiment, even when the water-impervious sheet portion 7 receives a tensile force, the tensile force is relaxed by the expansion / contraction adjusting portion 13b, and the water-impervious sheet portion 7 can be prevented from being damaged.
[0024]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a watertight sheet joining structure that hardly leaks even when subjected to deformation.
[Brief description of the drawings]
1 is a schematic cross-sectional view of a waste disposal site 1. FIG. 2 is a view showing a method of joining a water-proof sheet 15 constituting the water-proof sheet portion 7. FIG. 3 is a cross-sectional view of the water-proof sheet portion 7. ] Cross-sectional view of the water-impervious sheet portion 7 near the expansion / contraction adjustment portion 13a [FIG. 5] Cross-sectional view of the water-impervious sheet portion 7 near the expansion / contraction adjustment portion 13b [FIG. 6] FIG. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Waste disposal site 4 ... Water shielding structure 5 ... Protective soil layer 7 ... Water shielding sheet part 9 ... Water shielding layer 13 ... Stretch adjustment part 15 ... Water shielding sheet 17 ... Upper applied electrode 19 ... Upper unemployed cloth 21 ... Lower unwoven cloth 23 ... Lower application electrode 25 ... Mechanical joint 27 ... Protector 29 ... Round bar core

Claims (3)

A water-impervious sheet portion having other materials on the front and back of the water-impervious sheet as a central material, a bonding structure in the bonded portion of the water-impervious sheet,
On the other material on the back side, in the adjacent portion where the first water-impervious sheet and the second water-impervious sheet are arranged adjacent to each other, the end of the first water-impervious sheet and the first Pick up the ends of the two water-impervious sheets and form a margin so that the back sides are in contact with each other, and provide joints for the ends of the combined first and second water-impervious sheets Caulking, winding the combined first and second water-impervious sheets around a rod-shaped member made of a flexible material, and placing the other ones on the front side on top of the wound first and second water-impervious sheets Material is provided,
When a tensile force is exerted on the first and second impermeable sheets in the direction of opening the bonded portion, the first and second impermeable sheets respectively open the bonded portion via the rod-shaped member. A bonded structure of a water shielding sheet, which moves to relax the tensile force .   The water shielding sheet joining structure according to claim 1, wherein the water shielding sheet is a urethane sheet. 2. The water shielding sheet according to claim 1, wherein the other material on the front side is an upper application electrode and an upper non-woven fabric, and the other material on the back side is a lower non-woven fabric and a lower application electrode. Bonding structure.

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