JP3974836B2 - Bonding structure for water shielding sheet and bonding method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joining structure and a joining method for a water shielding sheet laid in a waste final disposal site.
[0002]
[Prior art]
The waste final disposal site generally has, for example, a structure in which a concave storage portion is excavated in the ground, and multiple water shielding sheets are laid on the slope of the concave storage portion. In such a waste final disposal site, the waste is dumped into a concave storage section where each sheet is laid, and the water shielding sheet prevents contamination of groundwater and the like by contaminated water that exudes from the waste. Is to be laid.
[0003]
In the waste final disposal site, if the water shielding sheet is damaged, there is a risk that the contaminated water of the waste may penetrate into the groundwater from the damaged part. Therefore, the waste final disposal site has a protective mat made of non-woven fabric, etc. on its slope, and a water shielding sheet is laid on it, and an intermediate protective mat is placed on it. And a protective sheet (a light-shielding sheet is coated with a light-shielding coating to protect the sheet from sun rays) and has a multilayer sheet structure having at least the sheet and the protective mat. It is common.
[0004]
In addition, since the protective mat arrange | positioned at the surface position of the uppermost layer expands and contracts when it hits positively, it provides a margin and can endure expansion and contraction by providing a tack in part.
[0005]
In addition, the protective mat and the water shielding sheet are connected to cover the slope by connecting 2m wide ones, and a fixing work is provided on the shoulder to fix them to the slope, and each sheet is fixed. In addition to pressing the concrete block from above and fixing it, it also uses fixing such as bonding and fusing the water shielding sheet and protective mat.
[0006]
Therefore, conventionally, as a method of joining the water shielding sheet and the protective mat, a method of adhering with an adhesive tape or a double-sided tape, a method of adhering with an adhesive, a method of fusing by thermal fusion, and a double-sided adhesive tape on the back surface The method of joining with the surface fastener only stuck is employ | adopted (for example, refer patent document 1).
[0007]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 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 protective mat disposed at the surface position of the uppermost layer is provided with a tack, and thus flutters when the wind blows.
However, if the bonding between the protective mat and the water shielding sheet is too strong with a bonding method such as an adhesive, if the wind blows, the protective mat will peel off and at the same time a large force is applied to the water shielding sheet due to the wind. Since the stress was applied to the fixing work, the protective mat and the water shielding sheet were damaged at the same time. Therefore, there is a problem that the contaminated water may be leaked from the damaged portion.
[0009]
In addition, when the bonding is weak with a double-sided tape or the like, only the protective mat peeled off from the water-impervious sheet by the force of the wind will come off, but the double-sided tape that 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 becomes difficult to bond again. Therefore, there is a problem that the water shielding sheet is easily exposed from the protective mat and is easily damaged.
[0010]
Furthermore, according to the conventional surface fastener joining method described in Japanese Patent Application Laid-Open No. 11-19614, the surface fastener having only the double-sided adhesive tape attached to the back surface is not easily deformed, and conforms to the unevenness of the ground. Since there are few adhesion surfaces with the impermeable sheet laid, there exists a problem that the adhesive force of a surface fastener and an impermeable sheet is weak.
[0011]
Then, this invention is made | formed in order to solve the said problem, and joins the water-proof sheet | seat and the protection mat for the purpose of not damaging a water-proof sheet | seat easily in a waste final disposal site. It is an object to provide a bonding structure and a bonding method.
[0012]
[Means for Solving the Problems]
This invention is comprised so that the said subject may be solved, and the invention of Claim 1 is used in a waste final disposal site, and covers the slope of the concave storage part formed in the ground. In the waterproof sheet joining structure having a multilayer sheet structure using at least a waterproof mat and a protective mat composed of a nonwoven fabric, the waterproof sheet joining structure covers the waterproof sheet disposed in the upper layer of the multilayer sheet structure. Thus, the protective mat is bonded to the protective mat via a hook-and-loop fastener, and the hook-and-loop fastener is engaged with the protective mat and fixed to the back surface of the engaging portion. It is characterized by comprising a foam to be bonded and an adhesive portion for adhering the water shielding sheet to a surface of the foam on the water shielding sheet side.
[0013]
According to the present invention, even if the water shielding sheet is uneven due to the undulation of the slope, the foam of the surface 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 a protective mat made of nonwoven fabric, and the engagement state between the protective mat and the engaging portion is strengthened.
[0014]
According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the engaging portion of the surface fastener has a tip-shaped granular convex portion.
[0015]
According to the present invention, in addition to the operation of the invention according to the first aspect, the engagement between the hook-and-loop fastener engaging portion and the protective mat becomes stronger.
[0016]
According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the back surface of the engaging portion of the surface fastener and the foam are heat-sealed. To 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 surface fastener are not easily peeled off, and the surface fastener has a strong structure.
[0018]
According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, the hook-and-loop fastener is fixed to the protective mat by the adhesive force adhered to the water-impervious sheet. It is characterized by a larger fixing force.
[0019]
According to the present invention, when a strong wind blows, only the protective mat and the hook-and-loop fastener are peeled off from the waterproof sheet, and the waterproof sheet remains stuck to the ground. It avoids damage to the water shielding sheet. Further, when the protective mat dances in the wind and returns to the ground again, it is joined again to the water shielding sheet by the adhesive force on the back surface of the hook-and-loop fastener.
[0020]
The invention according to claim 5 has a multilayer sheet structure that is used at a waste final disposal site and uses at least a water-proof sheet for covering the slope of a concave storage portion formed on the ground and a protective mat made of nonwoven fabric. In the water shielding sheet joining method, the step of superimposing each sheet on the slope of the concave storage portion, the step of providing the water shielding sheet disposed on the upper layer of each sheet, and the foam on the water shielding 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 wind blows, the foam of the hook-and-loop fastener relaxes the stress to peel off the water-impervious sheet, reduces the stress on the adhesive part, and makes the water-impervious sheet difficult to peel off. At the same time, it becomes difficult to break. In addition, the foam is easy to fit against the undulations of the slope, and the adhesive area with the water shielding sheet laid in accordance with the unevenness of the ground is widened and is difficult to peel off. Further, the engagement with the protective mat is strengthened by the engaging portion of the surface fastener.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the configuration of the waste final disposal site according to the embodiment of the present invention will be described.
FIG. 1A is a perspective view of a waste final disposal site, and FIG. 1B is a cross-sectional view of the waste final 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. And the water impervious sheet | seats 2 and 4 are laid in the slope 10 of the recessed storage part 12 so that the contaminated water which oozes from a waste may osmose | permeate groundwater and may not be polluted by the environment. Examples of the material of the water shielding sheets 2 and 4 include a synthetic resin excellent in water shielding.
[0023]
If the water-impervious sheets 2 and 4 are damaged, there is a concern about contamination of public water areas and groundwater by the leachate from the concave storage portion 12. Therefore, for example, the water shielding sheets 2 and 4 need to be protected by the protective mats 1, 3 and 5 made of nonwoven fabric.
Therefore, first, on the slope 10 of the concave storage portion 12, a protective mat 5 is installed to protect the lower water-impervious sheet 4 from being damaged by the unevenness of the ground, and the water-impervious sheet 4 is laid thereon. Is done.
[0024]
And on that, the water shielding sheet 2 is provided in order to further strengthen the water shielding structure. However, if the water shielding sheet 4 and the water shielding sheet 2 are directly laid on top of each other, there is a risk of simultaneous damage. Therefore, in order to prevent simultaneous breakage, the intermediate protective mat 3 is laid on the upper surface of the water-impervious sheet 4, and the second water-impervious sheet 2 is laid thereon.
[0025]
Furthermore, if the wastewater or earth and sand is directly dumped on the water-impervious sheet 2, the water-impervious sheet 2 may be damaged by projections such as waste. A protective mat 1 is laid.
[0026]
Since each of these sheets is fixed to the concave storage part 12, for example, a fixing work 11 is provided on the shoulder of the concave storage part 12, and each sheet is pushed into the fixing work 11, and a concrete block or the like is formed thereon. It is fixed by pushing in.
[0027]
Next, the surface fastener 6 for joining the water shielding sheet 2 and the protective mat 1 will be described with reference to the drawings. 2A is a perspective view of a 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 joining structure of a protective mat and a water shielding sheet through the hook-and-loop fastener.
[0028]
As shown in FIGS. 2A and 2B, the surface fastener 6 includes an engaging portion 6a for engaging and fixing the protective mat 1 and a foam 6b bonded to the back surface of the engaging portion 6a. And the adhesion part 6c for making the water impervious sheet 2 adhere to the surface which becomes the water impervious sheet 2 side of the foam 6b is provided.
The surface fastener 6 has a horizontal length of about 30 cm and a vertical length of about 10 cm, for example, and the foam 6b of the surface fastener 6 is made of, for example, PP, PE, or urethane. Moreover, the thickness is about 1 mm-about 10 mm, and should just follow the unevenness | corrugation by the ups and downs of the water-impervious sheet 2, and the influence of the unevenness | corrugation should just become the minimum with respect to the adhesion part 6c.
[0029]
In addition, as for the engaging part 6a of the hook-and-loop fastener 6, it is desirable to have a front-end | tip granular convex part. By doing so, the engaging portion 6a of the hook-and-loop fastener 6 enters and engages with the fibers of the nonwoven fabric, so that the fixation with the protective mat 1 becomes strong.
[0030]
Moreover, it is desirable that the back surface of the engaging portion 6a of the surface fastener 6 and the foam are heat-sealed. By doing so, the foam 6b and the engaging portion 6a are not easily peeled off, and the surface fastener 6 can have a strong structure.
[0031]
As shown in FIG. 3, the water shielding sheet 2 is adhered by the adhesive portion 6 c of the surface fastener 6, and the protective mat 1 is engaged and fixed by the engaging portion 6 a of the surface fastener 6. 2 and the protective mat 1 have a structure in which they are joined via a surface fastener 6. For the adhesive portion 6c of the surface fastener 6, for example, an acrylic or styrene synthetic resin adhesive or a synthetic rubber adhesive is used.
The hook-and-loop fastener 6 is disposed at an appropriate distance on the water-impervious sheet 2 and is partially interposed between the water-impervious sheet 2 and the protective mat 1.
[0032]
According to the above, in this embodiment, even if wind blows, the water-impervious sheet 2 is not peeled off, and it is possible to have an effect that it is difficult to break. Specifically, it is as follows.
[0033]
That is, when the wind blows, the protective mat 1 (see FIG. 1A) provided with the tack t flutters, and at the same time, the windshield also has a large force due to the wind. Will join. At this time, the foam 6b of the hook-and-loop fastener 6 acts as a cushioning material, and the stress to peel off the water-impervious sheet 2 from the protective mat 1 is relieved and the stress on the adhesive portion 6c is reduced. The mat 1 is difficult to peel off, and the water shielding sheet 2 is difficult to break.
Moreover, the foam 6b is easy to fit with respect to the undulation of the slope, and the adhesive area with the water shielding sheet 2 laid in accordance with the unevenness of the ground is widened and is difficult to peel off. Further, it is firmly engaged with the protective mat 1 by the engaging portion 6a.
[0034]
In addition, as for the surface fastener 6, the fixing force fixed to the protective mat 1 can also be made larger than the adhesive force adhering to the water-impervious sheet 2. FIG. By doing so, when strong wind blows, only the protective mat 1 is peeled off from the water-impervious sheet 2 and flutters, and the water-impervious sheet 2 remains stuck to the ground. It can escape that the water-impervious sheet 2 is damaged. Further, even when the protective mat 1 flutters in the wind and is peeled off from the water-impervious sheet, when the protective mat 1 returns to the water-impervious sheet 2 again, the adhesive portion 6c of the hook-and-loop fastener 6 is exposed to the water-impervious sheet 2. The waterproof sheet 2 and the protective mat 1 can be joined again.
[0035]
In addition, this invention is implemented in various forms, without being limited to the said embodiment.
For example, the water shielding sheet at the waste final disposal site is laid twice, but is not particularly limited, and may be triple or quadruple as long as it has a multilayer sheet structure. Moreover, in the joining structure, after adhering the hook-and-loop fastener 6 to the water-impervious sheet 2 laid on the slope, it may be joined by laying the protective mat 1 from above, or before laying on the slope. It is good also as laying on the slope after joining the protective mat 1 to the water-impervious sheet 2 via the hook-and-loop fastener 6. Furthermore, the size, thickness, arrangement distance, and the like of the surface fastener 6 can be changed as appropriate.
[0036]
【The invention's effect】
According to the present invention, even if the wind blows, the foam of the surface fastener serves as a cushioning material, so that the water shielding sheet joined to the protective mat is hardly damaged. Moreover, a foam is easy to fit with respect to the undulation of a slope, and the adhesive area with the water-proof sheet | seat laid according to the unevenness | corrugation of a ground becomes large, and it becomes difficult to peel. Further, the engagement with the protective mat is strengthened by the engagement portion.
[Brief description of the drawings]
FIG. 1A is a perspective view of a waste final disposal site, and FIG. 1B is a cross-sectional view of a waste final disposal site.
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 shielding sheet via a hook-and-loop fastener.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Protection mat 2 Water shielding sheet 3 Intermediate protection mat 4 Water shielding sheet 5 Protection mat 6 Surface fastener 6a Engagement part 6b Foam 6c Adhesion part 10 Slope 11 Fixing work 12 Recessed storage part t Tack

Claims (5)

In the junction structure for a water shielding sheet having a multilayer sheet structure using at least a water shielding sheet for covering the slope of the concave storage portion formed on the ground and a protective mat made of a nonwoven fabric, which is used in a waste final disposal site,
The bonding structure for a water shielding sheet is a bonding structure in which the protective mat is bonded via a surface fastener so as to cover the water shielding sheet disposed in an upper layer of a multilayer sheet structure.
The hook-and-loop fastener includes an engaging portion for engaging and fixing the protective mat, a foam adhered to the back surface of the engaging portion, and a surface of the foam on the water shielding sheet side. A bonding structure for a water shielding sheet, comprising: an adhesive portion for adhering the water shielding sheet. The joint structure for a water-impervious sheet according to claim 1, wherein the engaging portion of the surface fastener has a granular protrusion at the tip. 3. The water shielding sheet joining structure according to claim 1, wherein the back surface of the engaging portion of the surface fastener and the foam are heat-sealed. 4. 4. The water shielding material according to claim 1, wherein the hook-and-loop fastener has a larger fixing force fixed to the protective mat than an adhesive force adhered to the water shielding sheet. 5. Sheet joint structure. In the joining method for a water shielding sheet having a multilayer sheet structure using at least a water shielding sheet for covering the slope of the concave storage portion formed on the ground and a protective mat made of a nonwoven fabric, which is used in the final disposal site of the waste,
A step of superimposing each sheet on the slope of the concave storage section, a step of providing the water shielding sheet disposed on an upper layer of each sheet, and an engaging portion on the surface of the foam on the water shielding sheet. And a step of providing the protective mat via a hook-and-loop fastener having a pressure-sensitive adhesive portion on the back surface.

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