JPH0663525A - Water barrier sheet and detecting method of damaged part of water barrier sheet - Google Patents

Abstract

PURPOSE:To provide the water barrier sheet of a structure for specifying and repairing a damaged part in the case damage is generated, and the method for repairing the damaged part of the water barrier sheet for specifying and repairing the damage parts, in a waste disposal work using the water barrier sheet. CONSTITUTION:In the water barrier sheet 30 of a double structure which is divided into many blocks, and also, in which many bag bodies 40, 41 are formed by welding the lower layer sheets 14, 20 and the upper layer sheets 15, 21 in the periphery of each block, at least a pair of conductive lines 17 and a solidifying material injection tube 18 are provided in the inside of each bag body 40, 41. In such a state, a current is allowed to flow to the conductive line 17 and from a variation of a resistance value, a damaged part of the water barrier sheet 30 is detected and specified, and also, by injecting a solidifying material into the bag bodies 40, 41 through the injecting tube 18, the damaged part is repaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water shield sheet used in a waste disposal site and a method for detecting a damaged portion of the water shield sheet in a waste disposal site, and in particular, when the water leak occurs, the damaged site is specified. However, the present invention relates to a water impervious sheet capable of repairing the damaged portion by a simple external operation as necessary and a method of detecting a damaged portion of the water impervious sheet.

[0002]

2. Description of the Related Art In a landfill type waste disposal site for dumping industrial waste and general waste, in order to prevent the sewage leaking from the disposal site from infiltrating underground and causing environmental pollution, It is obligatory to carry out a seepage control work on the bottom. As such a water shield work, a method of laying a soft synthetic resin or rubber water shield sheet has been conventionally adopted from the viewpoint of reliability, safety, workability, and economical efficiency.

That is, since a soft water-permeable sheet has almost no water permeation, it is superior in water-blocking property to other materials, and has the characteristics of being easy to lay and economically excellent. .

On the other hand, in recent years, there has been a problem that the water-blocking sheet laid at the waste disposal site is torn and sewage flows out to pollute the surrounding environment. In addition, as a countermeasure against such a problem, two layers of impermeable sheets are installed to prevent leakage of sewage with the second impermeable sheet even if the first impermeable sheet is torn to prevent water leakage. A method for improving the safety of the seat is being considered.

[0005]

However, the method of increasing the safety of the water-blocking sheet by the two-layer covering is as follows.
The safety factor was only increased by simply stacking two sheets, and it was not possible to determine whether or not the sheet had been damaged after the waste was landfilled. Also, even if the sheet had been damaged, the damaged area should be identified. However, there is a problem that the damaged part cannot be repaired. And
If it is possible to identify the damaged portion of the water blocking sheet and repair the damaged portion, it is useful for enhancing the safety and reliability of the waste disposal site while enjoying the advantage of using the water blocking sheet.

Therefore, the present invention has been made by paying attention to the above-mentioned problems, and in a double-layer waterproof sheet used at a waste disposal site, when the waterproof sheet is damaged, Damage to the water-blocking sheet that can identify the damaged part and that can easily repair the damaged part and the damaged part that can repair the damaged part as needed, and repair the damaged part when necessary An object is to provide a method for detecting a copy.

[0007]

The present invention has been made in order to achieve the above object, and its gist is to divide into a plurality of sections and press-bond a lower layer sheet and an upper layer sheet around each divided section. A large number of bag bodies formed by forming a double-layered waterproof sheet consisting of a lower layer sheet and an upper layer sheet, inside each of the bag bodies, arranged in parallel at predetermined intervals, and at one end Is provided with at least a pair of conductive wires led out from the bag body, and is a water-impervious sheet used in a waste disposal site.

Further, it is preferable that the water-impervious sheet further comprises a solidifying material injection pipe for supplying and injecting the solidifying material into the inside of each bag.

Here, the water-blocking sheet includes a water-permeable mat, a lower sheet sandwiched between the mat and a lower sheet and an upper sheet stuck on the upper surface of the mat, and disposed inside the mat. It is preferable that the sheet member is composed of at least a pair of conductive wires and a solidifying material injection pipe.

Further, as the sheet member, the lower surface sheet and the upper surface sheet are extended beyond the side end portions of the mat, and they are pressure-bonded to each other at the extension portions, and further extended from the pressure-bonding portions to be adjacent to each other. It is also possible to use a sheet member in which a press-fitting margin for the lower sheet and the upper sheet is formed.

Another object of the present invention is a water-impermeable sheet having a double structure consisting of an upper layer sheet and a lower layer sheet, which is crimped at a predetermined location to form a large number of partitioned bags. In each bag, a water-blocking sheet, which is arranged in parallel at a predetermined interval and has at least one pair of conductive wires whose one end is led out from the bag, is laid on the bottom surface of the waste disposal site, and the waste is disposed. To monitor the presence or absence of water leakage caused by breakage of the water-blocking sheet by detecting a change in the resistance value by passing an electric current between the conductive wires after the introduction of the Is a method for detecting a damaged portion of a waterproof sheet at a waste disposal site.

Still another object of the present invention is a water-impermeable sheet having a double structure consisting of an upper layer sheet and a lower layer sheet, which is crimped at a predetermined location to form a large number of partitioned bags. A water-impervious sheet having at least a pair of conductive wires arranged in parallel in each bag at a predetermined interval and having one end led out from the bag, and a solidifying material injection pipe for supplying and injecting the solidifying material. Is laid on the bottom of the waste disposal site, and after the waste is thrown in, electric current is passed between the conductive wires to detect the change in the resistance value, thereby checking for the presence or absence of water leakage caused by damage to the impermeable sheet. By monitoring and identifying the damaged part from the changed conductive wire, and by further injecting the solidifying material into the bag as the identified damaged part through the solidifying material injection pipe, Solidification and damage In damaged portion detection method of the water shield sheet in waste disposal sites, characterized in that the repair to.

[0013]

According to the water impervious sheet and the method of detecting a damaged portion of the water impervious sheet having the above structure, the presence or absence of water leakage is detected from the change in the resistance value by passing an electric current through the conductive wire provided in the bag. It is possible to easily identify the section including the damaged portion of the water shield sheet from the changed conductive wire. Further, if the solidifying material is pressure-fed and injected into the partition including the damaged portion, that is, the bag body, the inside of the bag body is solidified and the damaged portion can be easily repaired.

The water-permeable sheet is disposed inside the mat, a mat having water permeability, a lower sheet sandwiched between the mat and a lower sheet and an upper sheet stuck on the upper surface of the mat. , A sheet member comprising at least a pair of conductive wires and a solidifying material injection pipe, or further extending the lower surface sheet and the upper surface sheet beyond the side end portion of the mat, and pressing them together at the extension portion. If the sheet member is formed by further extending from the crimping portion and forming the respective crimping margins of the lower sheet and the upper sheet of the adjacent sheet member, the sheet member is manufactured at the factory, and the conductive wire and the solidifying material are injected. The efficiency of pipe arrangement work and on-site crimping work makes it possible to easily lay a waterproof sheet.

[0015]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing an embodiment of a waste disposal site 10 having a water blocking sheet 30 according to the present invention. The waste disposal site 10 is formed by excavating a vast site in a mountainous area, for example, in a concave shape, and the concave portion has a double-layered water-impervious structure having a connecting portion sheet member 11 and a general portion sheet member 12 on the bottom surface thereof. The seat 30 is laid.

As shown in FIG. 2, the connecting portion sheet member 11 is, for example, a rectangular water-permeable mat 1 made of non-woven fabric or the like.
9 are sandwiched between the upper and lower surfaces of the sheet, and the lower sheet 14 and the upper sheet 15 are made of a synthetic resin or rubber sheet and constitute the lower sheet and the upper sheet. The pair of conductive wires 17 located on both sides of the water-permeable mat 19, and the water-permeable mat 19
And a solidifying material injection pipe 18 located in the central portion of the. Further, the lower surface sheet 14 and the upper surface sheet 15 extend laterally beyond the side end portion of the water-permeable mat 19 and are pressed or welded to each other at the extended portion, and further extended from the welded portion 16 to be adjacent to each other. Welding margins 16a, 16b for fusion bonding with the sheet member 12 of the general portion
Each is equipped with. In addition, the lower surface sheet 14 and the upper surface sheet 15 are appropriately extended from the side end portions of the water permeable mat 19 in the front and back directions in the drawing, and these are welded to each other, so that the water permeable mat 19 is formed together with the welding portion 16 in the left and right direction. A bag body 40 for covering is formed. Further, the solidified material injection pipe 18 has a double structure composed of a flexible non-perforated inner pipe 31 and a flexible perforated outer pipe 32.

On the other hand, as shown in FIG. 3, the general part sheet member 12 is sandwiched by a rectangular water-permeable mat 29, which is made of, for example, a non-woven fabric and has a size larger than that of the connecting part sheet member 11. The lower surface sheet 20 and the upper surface sheet 21 which are made of a synthetic resin or rubber-based sheet and which are respectively attached to the lower surface and which constitute the lower layer sheet and the upper layer sheet, and the water permeable mat 29 are arranged in parallel at predetermined intervals. A plurality of pairs of conductive wires 17 and a solidifying material injection pipe 18 arranged in the center of the inside of the water-permeable mat 29. In addition,
The bottom sheet 20 and the top sheet 21 are appropriately extended from the side ends of the water-permeable mat 29 in the front and back directions in the drawing, and they are welded to each other.

In order to lay the water-blocking sheet 30 on the bottom surface of the waste disposal site 10 using these sheet members 11 and 12, the connection sheet member 11 and the general portion sheet member 12 each manufactured in the factory are used. They are transported to the installation site and welded and integrated on site. That is, as shown in FIG. 4, the connection portion sheet member 11 and the general portion sheet member 12
Are alternately arranged, and the welding margin 16a of the lower sheet 14 and the welding margin of the upper sheet 15 of the connection sheet member 11 are
By in-situ welding the lower surface sheet 20 and the upper surface sheet 21 of the general portion sheet member 12 to the peripheral portions of the sheet 6b, these can be easily integrally joined. In addition, the side end portions of the connecting portion sheet member 11 and the general portion sheet member 12 in the front and back directions in the drawing are also integrally joined by the in-situ welding 43 (see FIG. 5) as appropriate, and the in-situ welding 42, 4
3, the general portion sheet member 12 also forms the bag body 41 that covers the water-permeable mat 29. Then, the bag body 41 made of the general portion sheet member 12 partitions the water blocking sheet 30 together with the bag body 40 made of the connection portion sheet member 11.

The connecting sheet member 11 and the general sheet member 12 are preferably small in size in terms of repair efficiency when the water-blocking sheet 30 is damaged and early detection of damage, but It is desirable to have a large area from the viewpoint of workability and economical efficiency, and in view of these points, it is preferable to set the area to 200 to 1000 m ² .

As shown in FIG. 5, one end of the conductive wire 17 disposed in each bag 40, 41 is led out from the connecting portion sheet member 11 or the general portion sheet member 12,
It is wired to a management building or the like arranged near the waste disposal site 10. In addition, one end of the injection pipe 18 is also the bag 40, 4
1 and is connected to a solidifying material supply pump or the like. Further, the water-permeable mats 19 and 29 act as cushions to protect the lower sheets 14 and 20, the upper sheets 15 and 21, the conductive wire 17, the injection pipe 18 and the like, and even when the sewage leaks, the water is evenly contained so that the conductive wires can be absorbed. The leak point is surely detected by 17, and the skeleton of the solidified body at the time of repair is constructed.

In this embodiment, the welding method is adopted as the pressure-bonding method. However, a pressure-bonding means using an adhesive or the like may be used.

Further, the water blocking sheet 30 according to this embodiment is
It is not always necessary to lay it over the entire bottom surface of the waste disposal site 10, and in view of economy and workability, it can be used only in an important part, and a normal water-impervious sheet can be laid in other parts.

The water-blocking sheet 3 having the above structure
After laying 0, the waste and the soil are alternately put into the waste disposal site 10.

In this state, an electric current is passed through each conductive wire 17 for each section of the bags 40 and 41 to monitor the resistance value thereof. When the water-blocking sheet 30 is kept in a steady state without being damaged, the resistance meter 22 connected to the conductive wire 17 is used.
The resistance value indicated by is kept constant. However, when a part of the water-blocking sheet 30 is damaged and the sewage exuding from the waste enters the bags 40 and 41 to impregnate the mat 19,
Since the resistance value decreases, the conductive wire 1 whose resistance value has decreased
From 7, it is possible to easily identify the section in which the impermeable sheet 30 is damaged and the sewage leaks out. Further, the degree of water leakage can be known from this resistance value, and it can be determined that the water has completely leaked, for example, when the resistance values of the most distant conductive wires 17 reach a predetermined value. It should be noted that the damaged portion can also be detected by suctioning from the bag bodies 40 and 41 through the flexible inner tube 31 or by blowing air or the like into the bag bodies 40 and 41 and collecting the leaked dirty water. Can be detected.

Then, when the fluidized solidifying material is pumped from the solidifying material supply pump or the like into the bags 40 and 41 of the corresponding compartments through the filling pipe 18, the solidified material is injected into the mat 1
It is impregnated in 9, 29, and further injected into the ground from the damaged part of the sheet to harden the ground around the damaged part,
The damaged portion is completely repaired by solidifying the inside of the bags 40 and 41.

Here, it is preferable to use, as the solidifying material, one having strong elasticity after solidification, such as urethane resin or super absorbent resin. Further, if a solidifying synthetic resin such as an epoxy resin or a polyester resin is used, these also function as an adhesive, so that the sheet around the damaged portion, the mat, and the peripheral ground are strengthened.

[0027]

As described above in detail with reference to the embodiments, according to the method of detecting a water shield sheet or a damaged portion of the water shield sheet according to the present invention, an electric current is passed through a conductive wire provided in the bag body to Since the presence or absence of water leakage is detected from the change in the resistance value, it is possible to easily identify the damaged portion of the water shield sheet from the changed conductive wire. Further, by injecting the solidifying material into the specified damaged portion through the solidifying material injection pipe, the inside of the bag body is solidified and the damaged portion can be easily repaired. That is, since it is easy to identify the damaged portion of the water impervious sheet and repair it as necessary, it is possible to enhance the safety and reliability of the waste disposal site.

Further, if the water-blocking sheet is constituted by the sheet member of the present invention, such a sheet member is produced at the factory, and the work of disposing the conductive wire and the solidifying material injection pipe and the welding work at the site are made more efficient. The water sheet can be laid easily.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an embodiment of a waste disposal site on which a waterproof sheet according to the present invention is laid.

FIG. 2 is a cross-sectional view showing details of a connecting portion sheet member that constitutes the water blocking sheet according to the above embodiment.

FIG. 3 is a cross-sectional view showing details of a general portion sheet member that constitutes the water-impervious sheet according to the above-described embodiment.

FIG. 4 is a cross-sectional view showing a situation in which a connecting sheet member and a general sheet member are integrally joined by in-situ welding to lay a waterproof sheet.

FIG. 5 is a schematic cutaway plan view showing a part of the waterproof sheet according to the above embodiment in an enlarged manner.

[Explanation of symbols]

 10 Waste Disposal Site 11 Connection Sheet Member 12 General Section Sheet Member 14,20 Lower Sheet (Lower Sheet) 15,21 Upper Sheet (Upper Sheet) 16 Welding Section (Crimping Section) 16a, 16b Welding Allowance (Crimping Allowance) 17 Conductive wire 18 Solidifying material injection pipe 19 Water-permeable mat 30 Water-impervious sheet 40, 41 Bag

Claims (6)

[Claims] 1. A double structure composed of a lower layer sheet and an upper layer sheet, wherein a plurality of bags are formed by pressing the lower layer sheet and the upper layer sheet around each of the divided sections by pressure bonding. A water impervious sheet, characterized in that inside each of the bags, at least a pair of conductive wires arranged in parallel at a predetermined interval and having one end led out from the bag are disposed of. Impermeable sheet used in the field. 2. The waste disposal site according to claim 1, further comprising a solidifying material injection pipe for supplying and injecting a solidifying material into the respective bags inside the respective bags. Impermeable sheet. 3. A sheet member constituting the water-blocking sheet, comprising a water-permeable mat, a lower sheet attached to the lower surface of the mat and attached to the upper surface, and an upper sheet attached to the upper surface. A sheet member comprising at least a pair of conductive wires and a solidifying material injection pipe, which are arranged inside the mat. 4. The lower surface and the upper surface sheet are extended beyond the side end portions of the mat, and the mating portions are crimped to each other at the extension portions, and further extended from the crimping portions, so that the lower surface of an adjacent sheet member. 4. The press-fitting margins for the sheet and the top sheet are respectively formed.
The sheet member according to. 5. A water-impermeable sheet having a double structure consisting of an upper layer sheet and a lower layer sheet, wherein a number of divided bag bodies are formed by crimping a predetermined portion and a predetermined space is provided in each bag body. A water-impervious sheet having at least a pair of conductive wires arranged in parallel at one end and led out from the bag body is laid on the bottom surface of the waste disposal site, and the conductive wires A waste disposal site characterized by monitoring the presence or absence of water leakage caused by damage to the water-blocking sheet by detecting a change in its resistance value by passing an electric current, and identifying the damaged part from the changed conductive wire. For detecting damaged parts of water-blocking sheets in Japan. 6. A water-impermeable sheet having a double structure composed of an upper layer sheet and a lower layer sheet, wherein a number of divided bag bodies are formed by crimping a predetermined position and a predetermined space is provided in each bag body. In the bottom part of the waste disposal site, a water-blocking sheet having at least a pair of conductive wires arranged in parallel at one end and led out from the bag body, and a solidifying material injection pipe for supplying and injecting the solidifying material The presence or absence of water leakage caused by the breakage of the water-blocking sheet is monitored by detecting the change in the resistance value by passing an electric current between the conductive wires after the waste is thrown in, and the changed conductive wires. The damage point is identified from the above, and the solidified material is fed and injected into the bag body as the specified damage point through the solidification material injection pipe to solidify the bag body and repair the damage point. Waste treatment facility characterized by A method for detecting a damaged part of a waterproof sheet in a branch.