JP2004097941A - Joint structure for water-barrier sheet and its joining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure for water-barrier sheets in which a protection mat and the water-barrier sheet are hardly peeled off and the water-barrier sheet is hardly damaged even if wind blows at a waste final disposal place, and a joining method of water-barrier sheets. <P>SOLUTION: The joint structure for water-barrier sheets used at the waste final disposal place having a multi-layer sheet structure using at least a water-barrier sheet 2 for covering normal of a recessed accommodation part formed on the ground and the protection mat 1 comprising nonwoven fabric. The joint structure for water-barrier sheets is a joint structure for joining the protection mat 1 arranged on the surface position of the uppermost layer of the multi-layer sheet structure to the water-barrier sheet 2 arranged on the uppermost layer of the multi-layer sheet structure through a Verclo-type fastener 6. The fastener 6 is provided with an engagement part 6a for engaging and fixing to the protection mat 1; a foam body 6b adhered to the back surface of the engagement part 6a; and an adhesion part 6c for bonding the water-barrier sheet 2 to the surface of the foam body 6b becoming the water-barrier sheet 2 side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a joining structure and a joining method of a seepage control sheet laid at a final waste disposal site.
[0002]
[Prior art]
The final waste disposal site generally has, for example, a structure in which a concave storage portion is excavated in the ground, and a plurality of waterproof sheets are laid on the slope of the concave storage portion. In such a final waste disposal site, the waste is dumped into the concave storage section where each sheet is laid, and the impermeable sheet is used to prevent contamination of groundwater and the like due to contaminated water leaching from the waste. Is to be laid.
[0003]
At the final waste disposal site, if the impermeable sheet is damaged, the contaminated water from the waste may permeate the groundwater from the damaged part. Therefore, at the final disposal site, a protection mat made of non-woven fabric is laid on the slope, a waterproof sheet is laid on it, and an intermediate protective mat is placed on it, and a waterproof sheet is placed on it. And a protective mat (a light-shielding coating or the like is provided on the exposed portion to protect the water-impermeable sheet from sunlight), which has a multilayer sheet structure having at least a water-impermeable sheet and a protective mat. It is common.
[0004]
Since the protective mat placed at the surface of the uppermost layer expands and contracts when exposed to the sun, a tack is provided on a part of the protective mat so that a margin is provided and the protective mat can withstand expansion and contraction.
[0005]
In addition, the protective mat and the impermeable sheet are connected by 2m wide to cover the slope. To fix them on the slope, a fixing work is provided on the slope, and each sheet is fixed. The concrete block is pushed in from above and the concrete block is pushed in from above to fix it. In addition, the waterproofing sheet and the protective mat are bonded and fused together.
[0006]
Therefore, conventionally, as a method of joining the waterproof sheet and the protective mat, there are a method of bonding with an adhesive tape or a double-sided tape, a method of bonding with an adhesive, a method of fusing by heat fusion, and a method of bonding a double-sided adhesive tape on the back surface. A method of joining with a hook-and-loop fastener that has just been attached is employed (for example, see Patent Document 1).
[0007]
[Patent Document 1]
JP-A-11-19614 (Pages 2 to 3, FIGS. 1 and 2)
[0008]
[Problems to be solved by the invention]
However, the conventional bonding method has the following problems.
That is, the protection mat arranged at the surface position of the uppermost layer is fluttered when the wind blows because the tack is provided.
However, if the bonding between the protective mat and the impermeable sheet is too strong using a bonding method such as an adhesive, when the wind blows, the protective mat will flutter and at the same time a large force will be applied to the impermeable sheet by the wind. Because of the stress applied to the fixing work, the protective mat and the impermeable sheet were simultaneously damaged. Therefore, there is a problem that the contaminated water may leak from the damaged portion.
[0009]
In addition, in the case of bonding using a double-sided tape, if the bonding is weak, only the protective mat that has been peeled off from the impermeable sheet by the force of the wind will flutter, but the double-sided tape, which is the bonding means, is made of nonwoven fabric. Since the mat material adheres and the adhesive strength of the double-sided tape weakens, it is difficult to adhere again. Therefore, there is a problem that the impermeable sheet is easily exposed from the protective mat and is easily damaged.
[0010]
Further, according to the conventional bonding method using a surface fastener described in Japanese Patent Application Laid-Open No. 11-19614, a surface fastener in which a double-sided adhesive tape is simply adhered to the back surface is difficult to deform, and is adapted to the unevenness of the ground. There is a problem that the adhesive strength between the hook-and-loop fastener and the water-impervious sheet is weak because the surface of the water-impervious sheet to be laid is small.
[0011]
Then, this invention is made in order to solve the said problem, In a final waste disposal site, it aims at preventing a waterproof sheet from being easily damaged, and joining a waterproof sheet and a protection mat. It is an object to provide a joining structure and a joining method.
[0012]
[Means for Solving the Problems]
The present invention is configured to solve the above-mentioned problem, and the invention according to claim 1 is used in a waste final disposal site, and covers a slope of a concave storage portion formed on the ground. In the joining structure for a water-blocking sheet having a multilayer sheet structure using at least a protection mat made of a water-blocking sheet and a nonwoven fabric, the joining structure for a water-blocking sheet covers the water-blocking sheet disposed above the multilayer sheet structure. As described above, the protective mat has a joining structure for joining via a hook-and-loop fastener, and the hook-and-loop fastener has an engaging portion for engaging and fixing the protecting mat and a back surface of the engaging portion. It is characterized by comprising a foam to be adhered, and an adhesive portion for adhering the water impermeable sheet to a surface of the foam on the side of the water impermeable sheet.
[0013]
According to the present invention, even if the impermeable sheet is uneven due to the unevenness of the slope, the foam of the hook-and-loop fastener follows the unevenness and the adhesive portion does not become a point contact. Further, the engaging portion of the hook-and-loop fastener is engaged with the protection mat made of non-woven fabric, so that the engagement state between the protection mat and the engaging portion is strong.
[0014]
According to a second aspect of the present invention, in the configuration of the first aspect, the engaging portion of the hook-and-loop fastener has a convex portion having a granular tip.
[0015]
According to the present invention, in addition to the operation according to the first aspect, the fixing between the engaging portion of the hook-and-loop fastener and the protective mat is further strengthened.
[0016]
According to a third aspect of the present invention, in the configuration of the first or second aspect, the back surface of the engaging portion of the hook-and-loop fastener and the foam are heat-sealed. I do.
[0017]
According to the present invention, in addition to the operation according to the first or second aspect of the present invention, the foam and the back surface of the hook-and-loop fastener are not easily separated, and the hook-and-loop fastener has a strong structure.
[0018]
According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the hook-and-loop fastener is fixed to the protective mat by an adhesive force adhered to the impermeable sheet. It is characterized by a larger fixing force.
[0019]
According to the present invention, for example, when a strong wind blows, only the protection mat and the hook-and-loop fastener are peeled off from the impermeable sheet and flutter, and the impermeable sheet remains stuck to the ground. This prevents the impermeable sheet from being damaged. Further, when the protective mat returns in the wind and returns to the ground again, the protective mat is again joined to the impermeable sheet by the adhesive force of the back surface of the hook-and-loop fastener.
[0020]
The invention according to claim 5 has a multilayer sheet structure which is used in a final waste disposal site and at least uses a water-impervious sheet for covering the slope of a concave storage portion formed on the ground and a protective mat made of a nonwoven fabric. In the joining method for a water-blocking sheet, a step of stacking each sheet on a slope of the concave storage portion, a step of providing the water-blocking sheet disposed on an upper layer of each sheet, and a step of forming a foam on the water-blocking sheet Providing the protective mat via a hook-and-loop fastener having an engaging portion on the front surface and an adhesive portion on the back surface.
According to the present invention, even when the wind blows, by the foam of the hook-and-loop fastener, the stress that tends to peel off the impermeable sheet is reduced and the stress on the adhesive portion is reduced, and the impermeable sheet becomes difficult to peel off. At the same time, it is hard to break. In addition, the foam easily fits the undulations of the slope, has a large adhesive area with the water-impervious sheet laid according to the unevenness of the ground, and is hard to be peeled off. Further, the engagement with the protection mat is strengthened by the engagement portion of the hook-and-loop fastener.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the configuration of the final waste disposal site according to the embodiment of the present invention will be described.
FIG. 1A is a perspective view of a final waste disposal site, and FIG. 1B is a cross-sectional view of the final waste disposal site.
As shown in FIG. 1, first, for example, the ground is excavated in order to form a concave storage portion 12 for dumping waste. Then, on the slope 10 of the concave storage portion 12, double water-blocking sheets 2 and 4 are laid so that contaminated water oozing out of waste does not penetrate into groundwater to cause environmental pollution. Examples of the material of the water shielding sheets 2 and 4 include a synthetic resin having excellent water shielding.
[0023]
If the seepage control sheets 2 and 4 are damaged, there is a concern that the leachate from the concave storage section 12 may cause contamination of public water bodies and groundwater. Therefore, for example, the water shielding sheets 2 and 4 need to be protected by the protection mats 1, 3 and 5 made of a nonwoven fabric.
Therefore, first, on the slope 10 of the concave storage portion 12, a protection mat 5 for protecting the lower-layer impermeable sheet 4 from being damaged by unevenness of the ground is laid, and the impermeable sheet 4 is laid thereon. Is done.
[0024]
Then, a water-impervious sheet 2 is provided thereon to further strengthen the water-impervious structure. However, if the water-impervious sheet 4 and the water-impervious sheet 2 are laid directly on top of each other, they may be damaged at the same time. Therefore, in order to prevent simultaneous breakage, an intermediate protective mat 3 is laid on the upper surface of the water impermeable sheet 4, and a second water impermeable sheet 2 is laid thereon.
[0025]
Further, if wastes, earth and sand, etc. are dumped directly on the water impermeable sheet 2, the water impermeable sheet 2 may be damaged by protrusions such as wastes. A protection mat 1 is laid.
[0026]
Since each of these sheets is fixed to the concave storage section 12, for example, a fixing work 11 is provided on the shoulder of the concave storage section 12, and each sheet is pushed into the fixing work 11, and a concrete block or the like is placed on the sheet. Is pressed in to fix it.
[0027]
Next, the hook-and-loop fastener 6 for joining the impermeable sheet 2 and the protection mat 1 will be described with reference to the drawings. 2A is a perspective view of the hook-and-loop fastener, FIG. 2B is a cross-sectional view of the hook-and-loop fastener, and FIG. 3 is a cross-sectional view of a bonding structure between the protection mat and the water-blocking sheet via the hook-and-loop fastener.
[0028]
As shown in FIGS. 2A and 2B, the hook-and-loop fastener 6 includes an engaging portion 6a for engaging and fixing the protection mat 1, and a foam 6b adhered to the back surface of the engaging portion 6a. And an adhesive portion 6c for adhering the waterproof sheet 2 to the surface of the foam 6b on the side of the waterproof sheet 2.
The hook-and-loop fastener 6 has, for example, a horizontal length of about 30 cm and a vertical length of about 10 cm, and the foam 6b of the hook-and-loop fastener 6 is formed of, for example, PP, PE or urethane. The thickness thereof is about 1 mm to about 10 mm, and any thickness may be used as long as the influence of the unevenness following the unevenness of the impermeable sheet 2 is minimized on the adhesive portion 6c.
[0029]
It is desirable that the engaging portion 6a of the hook-and-loop fastener 6 has a convex portion having a granular tip. By doing so, the engaging portion 6a of the hook-and-loop fastener 6 enters into the fiber of the nonwoven fabric and is engaged, so that the fixing to the protection mat 1 is firm.
[0030]
Further, it is desirable that the back surface of the engaging portion 6a of the hook-and-loop fastener 6 and the foam be thermally fused. By doing so, the foam 6b and the engaging portion 6a are not easily peeled off, and the hook-and-loop fastener 6 can have a strong structure.
[0031]
Then, as shown in FIG. 3, the impermeable sheet 2 is adhered by the adhesive portion 6 c of the hook-and-loop fastener 6, and the protective mat 1 is engaged and fixed by the engaging portion 6 a of the hook-and-loop fastener 6, The protection mat 2 and the protection mat 1 have a structure in which they are joined via a hook-and-loop fastener 6. The adhesive portion 6c of the hook-and-loop fastener 6 is made of, for example, an acrylic or styrene-based synthetic resin-based adhesive or a synthetic rubber-based adhesive.
The hook-and-loop fastener 6 is arranged at an appropriate distance on the water-impermeable sheet 2, and is partially interposed between the water-impermeable sheet 2 and the protection mat 1.
[0032]
According to the above, in the present embodiment, even if the wind blows, the effect that the water impermeable sheet 2 is not peeled off and hardly damaged can be obtained. The details are as follows.
[0033]
That is, when the wind blows, the protection mat 1 provided with the tack t (see FIG. 1A) flutters, and at the same time, a large force due to the wind also applies to the impermeable sheet 2 joined to the protection mat 1. Will join. At this time, the foam 6b of the hook-and-loop fastener 6 serves as a cushioning material, so that the stress for peeling the water-blocking sheet 2 from the protection mat 1 is relaxed, and the stress to the adhesive portion 6c is reduced. The mat 1 is hardly peeled off, and the water shielding sheet 2 is hardly damaged.
In addition, the foam 6b is easily fitted to the undulation of the slope, has a large adhesive area with the impermeable sheet 2 laid in accordance with the unevenness of the ground, and is hardly peeled off. Further, the protective mat 1 is firmly engaged by the engaging portion 6a.
[0034]
In addition, the fixing force of the hook-and-loop fastener 6 fixed to the protection mat 1 can be larger than the adhesive force of the waterproofing sheet 2. By doing so, when a strong wind blows, only the protection mat 1 is peeled off from the impermeable sheet 2 and flutters, and the impermeable sheet 2 remains stuck to the ground. It is possible to prevent the water impermeable sheet 2 from being damaged. Even if the protection mat 1 is fluttered in the wind and peeled off from the waterproof sheet, when the protective mat 1 returns to the waterproof sheet 2 again, the adhesive portion 6c of the hook-and-loop fastener 6 is attached to the waterproof sheet 2. The waterproof sheet 2 and the protection mat 1 can be joined again.
[0035]
Note that the present invention is not limited to the above-described embodiment, but can be implemented in various forms.
For example, although the waterproof sheet at the final waste disposal site is laid double, it is not particularly limited, and any triple or quadruple waterproof sheet may be used as long as it has a multilayer sheet structure. In addition, in the joining structure, after attaching the hook-and-loop fastener 6 to the impermeable sheet 2 laid on the slope, the joining may be performed by laying the protection mat 1 from above or before laying on the slope. After the protective mat 1 is joined to the water impermeable sheet 2 via the hook-and-loop fastener 6, it may be laid on the slope. Further, the size, thickness, arrangement distance, and the like of the hook-and-loop fastener 6 can be appropriately changed.
[0036]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, even if it blows, since the foam of a hook-and-loop fastener functions as a shock absorbing material, the water-shielding sheet joined with the protective mat becomes difficult to be damaged. In addition, the foam easily fits the undulations of the slope, has a large adhesive area with the water-impervious sheet laid according to the unevenness of the ground, and is hard to be peeled off. Further, the engagement with the protection mat is strengthened by the engagement portion.
[Brief description of the drawings]
FIG. 1A is a perspective view of a final waste disposal site, and FIG. 1B is a cross-sectional view of the final waste disposal site.
FIG. 2A is a perspective view of a hook-and-loop fastener, and FIG. 2B is a cross-sectional view of the hook-and-loop fastener.
FIG. 3 is a cross-sectional view of a joint structure between a protective mat and a water impermeable sheet via a hook-and-loop fastener.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Protective mat 2 Waterproof sheet 3 Intermediate protective mat 4 Waterproof sheet 5 Protective mat 6 Surface fastener 6a Engaging part 6b Foam 6c Adhesive part 10 Slope 11 Fixed work 12 Concave storage part t Tack

Claims (5)

Used in a final waste disposal site, in a joint structure for a waterproof sheet having a multilayer sheet structure using at least a protective mat made of a waterproof sheet and a nonwoven fabric for covering the slope of a concave storage portion formed in the ground,
The joining structure for the water-blocking sheet is a joining structure for joining the protection mat through a hook-and-loop fastener so as to cover the water-blocking sheet disposed on the upper layer of the multilayer sheet structure,
The hook-and-loop fastener has an engaging portion for engaging and fixing the protection mat, a foam bonded to the back surface of the engaging portion, and a foam on a surface of the foam on the water-impervious sheet side. A bonding structure for a water impermeable sheet, comprising: an adhesive portion for adhering the water impermeable sheet. The joint structure for a seepage control sheet according to claim 1, wherein the engaging portion of the hook-and-loop fastener has a convex part having a granular tip. The joint structure for a water impermeable sheet according to claim 1 or 2, wherein the back surface of the engaging portion of the hook-and-loop fastener and the foam are heat-sealed. 4. The water shield according to claim 1, wherein the hook-and-loop fastener has a fixing force fixed to the protective mat larger than an adhesive force bonded to the water shield sheet. 5. Joint structure for seats. Used in a waste final disposal site, in the bonding method for a waterproof sheet having a multilayer sheet structure using at least a protective sheet made of a waterproof sheet and a nonwoven fabric for covering the slope of the concave storage portion formed in the ground,
Superimposing each sheet on the slope of the concave storage portion, providing the water-impervious sheet disposed on the upper layer of each sheet, and, on the water-impervious sheet, including an engaging portion on the surface of a foam. Providing the protective mat via a surface fastener having an adhesive portion on the back surface.

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