JP2009142777A - Impermeable liner-laying structure and water leakage detection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impermeable liner-laying structure in which impermeable liners are easily adhered by a self-propelled mechanical fusion. <P>SOLUTION: Neighboring underlayer impermeable liners 16 are stuck to each other through an underlayer impermeable liner-joining sheet 20. That is, the underlayer impermeable liners 16 are arranged at an interval and an end part of one of the underlayer impermeable liners 16 is overlapped with one end part of the underlayer impermeable liner-joining sheet 20 and an end part of the other underlayer impermeable liner 16 is overlapped with the other end part of the underlayer impermeable liner-joining sheet 20 to join the underlayer impermeable liners 16. Further, neighboring upper layer impermeable liners 14 are stuck to each other through an upper layer impermeable liner-joining sheet 18. That is, the upper layer impermeable liners 14 are arranged at an interval and an end part of one of the upper layer impermeable liners 18 is overlapped with one end part of the upper layer impermeable liner-joining sheet 14 and an end part of the other upper layer impermeable liner 18 is overlapped with the other end part of the upper layer impermeable liner-joining sheet 14 to join the upper layer impermeable liners 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water shielding sheet laying structure and a water leakage detection device, and in particular, covers the ground surface of a waste accumulation site in order to prevent water contaminated by accumulated waste from entering the ground. The present invention relates to a water-impervious sheet laying structure to be laid and a water leakage detection device using the water-impervious sheet laying structure.

  In a waste disposal site or the like, it is necessary to isolate the dumping site of the waste from the ground surface in order to prevent the sewage generated by the waste from entering the ground and affecting the surrounding environment. For this reason, a water shielding sheet made of rubber or the like is laid on the entire surface of the waste dumping place.

  Usually, in a waste disposal site as described above, sewage from a waste dumping site is guided to a sewage treatment facility and purified there. However, it is also conceivable that sewage may infiltrate into the ground due to tearing of the installed water shielding sheet. In order to detect the water leakage position when such water leakage occurs, in the technology described in Patent Document 1, the water shielding sheet has two layers, and a partition wall is provided between the two layers of the water shielding sheet to form a plurality of spaces. The water leakage position is specified by dividing and detecting from which of the water leakages.

Thus, when dividing the space between the double water-impervious sheets into a plurality of sections, partition partitions are required. In patent document 1, the water-proof sheet | seat used as this partition is adhere | attached on the upper and lower water-proof sheet | seats via the adhesive material. Bonding strength is weak in such adhesion via an adhesive. Then, although adhesion | attachment by melt | fusion is considered, in order to fuse | melt a partition with the structure of patent document 1, you have to carry out by manual roller press-type melt | fusion, ie, manual operation. In the manual roller pressing type fusion, the adhesive quality varies depending on the skill of the operator, and the adhesive strength is weaker than that of the self-propelled mechanical type fusion.
JP-A-6-31261

  The present invention has been made in consideration of the above facts, and has a water shielding sheet laying structure capable of easily adhering water shielding sheets to each other by self-propelled mechanical fusion, and this water shielding sheet laying structure. It is an object of the present invention to provide a water leakage detection device provided.

  In order to solve the above-mentioned problem, the water-impervious sheet laying structure according to claim 1 includes a plurality of lower-layer water-impervious sheets disposed on the ground surface side, and end portions of the lower-layer water-impervious sheets adjacent to each other. A lower-layer fused sheet that is fused to form a lower-layer fused part, and connects adjacent lower-layer impermeable sheets, and a plurality of upper-layer impermeable sheets arranged on the upper surface side of the lower-layer impermeable sheet; A water-blocking upper layer connecting sheet that is fused with each end of the upper water-blocking sheet adjacent to each other to form an upper-layer bonding section, and connects adjacent upper-layer water-blocking sheets, and one end of the lower layer bonding section And the other end is fused to the upper-layer fusion-bonding portion, and a plurality of bag-shaped spaces are formed by partitioning the lower-layer impermeable sheet and the upper-layer impermeable sheet. A partition sheet.

  In the water-impervious sheet laying structure of the present invention, adjacent lower-layer water-impervious sheets are connected by fusing a water-impervious lower-layer connection sheet at each end. Adjacent upper layer water-impervious sheets are connected to each other by fusing the water-impervious upper layer connection sheet at each end. And the lower layer fusion part is comprised in the fusion | melting part of a lower layer water-impervious sheet and a water-impervious lower layer connection sheet, and the upper layer fusion part is comprised in the fusion | melting part of an upper layer water-impervious sheet and a water-impervious upper layer connection sheet. Has been. The partition sheet that divides the lower layer impermeable sheet and the upper layer impermeable sheet has one end fused to the lower layer fused portion and the other end fused to the upper layer fused portion.

  According to the water shielding sheet laying structure of the present invention, each end of the lower layer impermeable sheet, the impermeable lower layer connecting sheet, and the partition sheet is disposed and fused in the lower layer fusion part, the upper layer impermeable sheet, The respective end portions of the water-blocking upper layer connecting sheet and the partition sheet are arranged and fused at the upper layer fusion portion. By joining the partition sheets by fusion in this way, the bonding strength of the partition portions can be increased as compared with the case of bonding by an adhesive. Further, in the present invention, the lower layer water-impervious sheets and the upper layer water-impervious sheets are not overlapped and fused, but the lower layer water-impervious sheets and the upper layer water-impervious sheets are bonded to each other. And, the lower layer fusion part and the upper layer fusion can be easily performed by changing the size of the water shielding lower layer connection sheet and the water shielding upper layer connection sheet. By shifting the position of the part, the position of the end part of each sheet can be easily adjusted for self-propelled mechanical fusion.

  The water-impervious sheet laying structure according to claim 2 is disposed between the lower-layer impermeable sheet and the upper-layer impermeable sheet in the bag-like space, and the interval between the lower-layer impermeable sheet and the upper-layer impermeable sheet is set. An intermediate material to be held is further provided.

  Thus, by arranging the intermediate material, water permeability can be ensured without the lower-layer impermeable sheet and the upper-layer impermeable sheet being in close contact with each other. As the intermediate material, it is possible to use, for example, a non-woven fabric or a spider that can ensure water permeability.

  In the water-impervious sheet laying structure according to claim 3, the lower-layer impermeable sheet and the partition sheet are overlapped and fused, and the upper-layer impermeable sheet and the partition sheet are overlapped. The fusion width to be fused is 200 mm or less.

  Thus, self-propelled mechanical fusion can be performed by setting the overlapping width of the water shielding sheets to 200 mm or less.

  The water leakage detection device according to claim 4 is the water leakage detection device including the water shielding sheet laying structure according to any one of claims 1 to 3, wherein the upper layer in the water shielding sheet laying structure is provided. An upper pipe that penetrates the water-impervious sheet and communicates with the bag-like space, a drain pipe that penetrates the lower-layer impermeable sheet in the water-impervious sheet laying structure and communicates with the bag-like space, and the drain pipe And a detector capable of detecting water flowing out of the apparatus.

  In the water leakage detection device having the above configuration, when the upper water-impervious sheet is damaged and sewage enters the bag-like space, the sewage is discharged from the drain pipe and detected by the detector. Thereby, it can be known from which bag-like space the sewage has flowed out, and the damaged portion of the upper water-impervious sheet can be easily identified.

  Moreover, since the water-impervious sheet laying structure according to any one of claims 1 to 3 is provided, the sheets can be easily joined to each other by a self-propelled mechanical fusion. A highly reliable water leakage detection device can be obtained.

  Since this invention was set as the said structure, the adhesive strength of a division part can be improved. In addition, the positions of the lower layer fusion part and the upper layer fusion part can be easily shifted to easily adjust the end position of each sheet for self-propelled mechanical fusion.

  The water shielding sheet laying structure according to the present invention is applied to an industrial waste disposal site or the like in which industrial waste or the like is dumped and deposited in a recess where the ground is dug. That is, the water shielding sheet laying structure according to the present invention is continuously laid on the ground surface forming the recess to prevent sewage in the recess from entering the surrounding ground.

  Moreover, the water leak detection apparatus according to the present invention performs detection when water leaks occur in the water shielding sheet laying structure.

  As shown in FIG. 1, the water leakage detection device 10 of the present embodiment includes a water shielding sheet laying structure 12. The water shielding sheet laying structure 12 is laid on one bottom wall surface and four side wall surfaces constituting the recess R. FIG. 2 shows a schematic cross-sectional configuration of the water shielding sheet laying structure 12.

  The water shielding sheet laying structure 12 includes an upper layer water shielding sheet 14, a lower layer water shielding sheet 16, a water shielding upper layer connection sheet 18, a water shielding lower layer connection sheet 20, and a partition sheet 22. These sheets are made of rubber or a mixture of rubber and synthetic resin, and have excellent water shielding properties.

  A lower mat 32 is laid between the lower water-impervious sheet 16 and the ground surface. As the lower mat 32, a plate-like member capable of ensuring water permeability, such as a nonwoven fabric, can be used.

  The lower water shielding sheet 16 is disposed on the lower mat 32, the upper water shielding sheet 14 is disposed so as to face the lower water shielding sheet 16, and the water shielding sheet laying structure 12 has a double sheet structure. ing. Moreover, the space between the upper layer water-impervious sheet 14 and the lower layer water-impervious sheet 16 is partitioned water-tightly by the partition sheet 22, and a plurality of independent bag-like spaces 30 are configured.

  A plurality of lower-layer water-impervious sheets 16 are arranged to cover the entire surface of the ground surface, and adjacent lower-layer water-impervious sheets 16 are joined together via a water-impervious lower-layer connection sheet 20. That is, the lower water-impervious sheets 16 are spaced apart from each other, and the end of one lower water-impervious sheet 16 and one end of the water-impervious lower layer connection sheet 20 are overlapped with each other. The end portion and the other end portion of the water-impervious lower layer connection sheet 20 are overlapped and connected.

  Also, a plurality of upper water-impervious sheets 14 are also arranged, and adjacent upper water-impervious sheets 14 are joined together via a water-impervious upper layer connecting sheet 18. That is, the upper water-impervious sheets 14 are spaced apart from each other, the end of one upper water-impervious sheet 14 and one end of the water-impervious upper layer connecting sheet 18 are overlapped, and The end portion and the other end portion of the water-impervious upper layer connecting sheet 18 are overlapped and connected.

  An upper mat 36 is laid on the upper side of the upper water-impervious sheet 14. As the upper mat 36, a plate-like member having water permeability, such as a nonwoven fabric, can be used.

  One end of the partition sheet 22 is overlaid on a connection portion (hereinafter referred to as “lower layer fusion portion 17”) between the lower water-impervious sheet 16 and the water-impervious lower layer connection sheet 20, and the other end is connected to the upper layer water-impervious sheet 14. It is overlaid under a connecting portion (hereinafter referred to as “upper layer fusion portion 15”) with the water shielding upper layer connecting sheet 18. In the lower layer fusion part 17, the overlapping lower layer water shielding sheet 16, the water shielding lower layer connection sheet 20, and the partition sheet 22 are fused together. Further, in the upper layer fusion part 15, the upper layer water shielding sheet 14, the water shielding upper layer connection sheet 18, and the partition sheet 22 that are overlapped are also fused to each other.

  An intermediate member 34 is disposed in each bag-shaped space 30 that is watertight. As the intermediate material 34, similarly to the upper mat 36 and the lower mat 32, a plate-like member capable of ensuring water permeability, for example, a nonwoven fabric, and a cocoon candy can be used. By disposing the intermediate material 34 having such water permeability, the lower layer water-impervious sheet 16 and the upper layer water-impervious sheet 14 are separated from each other, and water can flow in the bag-shaped space 30.

  The lower water-impervious sheet 16 is provided with a drain pipe 40 that passes through the lower water-impervious sheet 16 and the lower mat 32 and communicates with the bag-shaped space 30. The portion where the drain pipe 40 penetrates the lower water-impervious sheet 16 is sealed with a seal member 40S.

  As shown in FIG. 4, each drain pipe 40 is connected to a detection device 43. In the detection device 43, individual drainage sections 43 </ b> A corresponding to each drainage pipe 40 are configured, and it is possible to detect from which drainage pipe 40 water has flowed out. By specifying the drain pipe 40 from which water has flowed out, the damaged portion can be specified.

  The upper water-impervious sheet 14 is provided with a vent pipe 42 that passes through the upper layer impermeable sheet 14 and the upper mat 36 and communicates with the bag-shaped space 30. A portion where the ventilation pipe 42 penetrates the upper water-impervious sheet 14 is sealed with a seal member 42S. The vent pipe 42 vents the bag-shaped space 30 and, when the upper water-impervious sheet 14 is damaged, a repair material is poured into the bag-shaped space 30 from the vent pipe 42 to repair the damaged portion. .

  Next, the laying procedure of the impermeable sheet laying structure 12 of this embodiment will be described.

  In this application, joining of each water-impervious sheet is performed by self-propelled mechanical fusion (mechanical fusion). Here, the self-propelled mechanical fusion is a method in which a water-impervious sheet surface of a joint is heated and melted and bonded by pressure using a self-propelled fusion machine. This means that three conditions can be controlled by a machine. According to self-propelled mechanical fusion, since the conditions of heating temperature, self-propelled speed, and roller pressure are controlled by the machine, stable construction quality can be obtained.

  On the other hand, manual roller pressing-type fusion (hand fusion) is a method in which a waterproof sheet surface of a joint portion is heated and melted by pressure bonding using a handy type fusion machine that does not self-run. Hot air is blown out from a flat nozzle of a handy type hot air fusion machine, the water shielding sheet surface is melted with this hot air, and pressure bonding is performed manually with a hand roller or the like. Since all the fusion is performed manually, the construction quality is likely to vary, and it is necessary to be performed by skilled professional workers.

  First, the lower mat 32 is laid on the ground surface constituting the recess R, and the lower water-impervious sheet 16 is laminated thereon. And the one end part of the division sheet | seat 22 and the edge part of the lower layer impermeable sheet 16 are fuse | fused with a self-propelled heat-sealing machine. Next, the lower end portion of the lower layer impermeable sheet 16 and the upper end portion of the impermeable lower layer connecting sheet 20 are overlapped with each other at the fused portion (lower layer fused portion 17) between the partition sheet 22 and the lower layer impermeable sheet 16. And self-propelled heat fusion machine. Thereby, the lower water-impervious sheet 16, the water-impervious lower layer connection sheet 20, and the partition sheet 22 are heat-sealed.

  In addition, the overlapping width of one end part of the partition sheet 22 and the end part of the lower water-impervious sheet 16 and the upper overlap part of the lower end part of the lower-layer impermeable sheet 16 and the upper end part of the water-impervious lower layer connecting sheet 20 The width is preferably 200 mm or less because a self-propelled heat-sealing machine is used.

  Next, the other end portion of the partition sheet 22 and the end portion of the upper water-impervious sheet 14 are fused by a self-propelled heat-sealing machine, and the fused portion (upper layer fusion) of the partition sheet 22 and the upper water-impervious sheet 14 is fused. The upper end of the upper layer water-impervious sheet 14 and the lower end of the water-impervious upper layer connecting sheet 18 are overlapped and fused by a self-propelled heat-sealing machine. Thereby, the upper-layer water-impervious sheet 14, the water-impervious upper-layer connection sheet 18, and the partition sheet 22 are heat-sealed.

  In addition, the overlapping width of the other end portion of the partition sheet 22 and the end portion of the upper layer impermeable sheet 14 and the overlapping of the upper end portion of the upper layer impermeable sheet 14 and the lower end portion of the impermeable upper layer connecting sheet 18. Since the self-propelled heat-sealing machine is used for the alignment width, it is preferably 200 mm or less.

  Thus, by joining the lower layer water-impervious sheet 16, the water-impervious lower layer connection sheet 20, the partition sheet 22, and the partition sheet 22, the upper layer water-impervious sheet 14, and the water-impervious upper layer connection sheet 18 by thermal fusion, Strength can be increased.

  Further, in the present embodiment, since the end portions of the respective sheets are overlapped with each other, it can be heat-sealed by using a machine, and the joining performance can be made uniform as compared with the manual roller press-type fusion. At the same time, the bonding strength can be increased.

  An example of the test result about the joint shear strength between the self-propelled mechanical fusion and the manual roller pressing fusion is shown in FIG. As is apparent from the table of FIG. 5, the shear strength in the case of self-propelled mechanical fusion is more than twice that in the case of manual roller pressing fusion.

  Next, the intermediate material 34 is sequentially inserted into the bag-shaped space 30 partitioned by the partition sheet 22, and the respective sheets are joined so that the bag-shaped space 30 is sealed in the above procedure. A water shielding sheet is laid so that the entire wall surface of R is covered.

  By the way, when performing mechanical fusion, since it is necessary to join the end portions of the sheets, the end portion of the lower water-impervious sheet 16 and the end portion of the upper water-impervious sheet 14 are located at a position close to some extent. Need to be deployed. In this embodiment, the lower-layer water-impervious sheets 16 and the upper-layer water-impervious sheets 14 are not overlapped and fused, but the lower-layer impermeable sheets 16 and the upper-layer impermeable sheets 14 are water-impervious. The lower connection sheet 20 and the water-impervious upper layer connection sheet 18 are fused and connected. Therefore, the intervals between the lower water-impervious sheets 16 and the upper water-impervious sheets 14 can be easily changed by changing the sizes of the water-impervious lower layer connection sheet 20 and the water-impervious upper layer connection sheet 18. That is, the positions of the lower layer fusion part 17 and the upper layer fusion part 15 can be shifted and the end positions of the respective sheets can be easily adjusted for self-propelled mechanical fusion.

  In this embodiment, the water-impervious upper layer connecting sheet 18 is disposed on the upper side of the upper layer impermeable sheet 14 and the water-impervious lower layer connecting sheet 20 is disposed on the lower side of the lower layer impermeable sheet 16, as shown in FIG. Alternatively, the water shielding upper layer connection sheet 18 may be disposed below the upper layer water shielding sheet 14, and the water shielding lower layer connection sheet 20 may be disposed above the lower layer water shielding sheet 16. Moreover, as shown in FIG. 7, the one end side of the water-impervious upper layer connection sheet 18 is disposed on the upper side of the upper layer water-impervious sheet 14, and the other end side is disposed on the lower side, or one end side of the water-impervious lower layer connection sheet 20 is disposed. It can arrange | position to the upper side of the lower layer impermeable sheet 16, and can arrange | position an other end side to the lower side.

It is a figure which shows the example in which the water shielding sheet laying structure of this embodiment is applied to the recess. It is a figure which shows the schematic cross-sectional structure of the impermeable sheet laying structure of this embodiment. It is the schematic which looked at a part of water-impervious sheet laying structure of this embodiment from the upper surface. It is explanatory drawing which shows arrangement | positioning of the detector of the water leak detection apparatus of this embodiment. It is a table | surface which shows an example of the test result about the junction part shear strength in self-propelled mechanical fusion and manual roller press fusion. It is a figure which shows the schematic cross-sectional structure of the modification of the water-impervious sheet laying structure of this embodiment. It is a figure which shows the general | schematic cross-section structure of the other modification of the impermeable sheet laying structure of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Water leak detection apparatus 12 Water-impervious sheet laying structure 14 Upper layer water-impervious sheet 15 Upper layer fused part 16 Lower layer impermeable sheet 17 Lower layer fused part 18 Water-impervious upper layer connecting sheet 20 Water impermeable lower layer connecting sheet 22 Partition sheet 30 Bag-like space 32 Lower mat 34 Intermediate material 36 Upper mat 40 Drain pipe 42 Ventilation pipe 43 Detector

Claims (4)

A plurality of lower water shielding sheets arranged on the ground surface side,
A water-insulating lower layer connecting sheet that is fused to each end of the lower layer water-impervious sheet adjacent to each other to form a lower-layer fused part, and connects adjacent lower layer water-impervious sheets;
A plurality of upper-layer impermeable sheets disposed on the upper surface side of the lower-layer impermeable sheet, and
A water-impervious upper layer connecting sheet that is fused to each end of the adjacent upper-layer water-impervious sheet to form an upper-layer fused part, and connects adjacent upper-layer impermeable sheets,
One end is fused to the lower-layer fused portion, and the other end is fused to the upper-layer fused portion to partition between the lower-layer impermeable sheet and the upper-layer impermeable sheet, and a plurality of bags A plurality of partition sheets constituting the shape space;
A waterproof sheet laying structure with   The intermediate material which is arrange | positioned between the said lower layer impermeable sheet and the said upper layer impermeable sheet of the said bag-shaped space, and hold | maintains the space | interval of the said lower layer impermeable sheet and the said upper layer impermeable sheet. Water-proof sheet laying structure.   The fusion width in which the lower layer water-impervious sheet and the partition sheet are overlapped and fused, and the fusion width in which the upper layer impermeable sheet and the partition sheet are overlapped and fused are 200 mm or less. The water-impervious sheet laying structure according to claim 1, wherein the water-impervious sheet is laid. A water leakage detection device comprising the water shielding sheet laying structure according to any one of claims 1 to 3,
An upper pipe penetrating through the upper water-impervious sheet in the water-impervious sheet laying structure and communicating with the bag-shaped space;
A drain pipe that penetrates through the lower-layer impermeable sheet in the impermeable sheet laying structure and communicates with the bag-shaped space;
A detector capable of detecting water flowing out of the drain pipe;
A water leakage detection device.

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