JP2985597B2 - Detecting method of defective part of joint part of impermeable sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a deficient portion of a joint portion of a waterproof sheet.

[0002]

2. Description of the Related Art For example, in a landfill type waste disposal site that dumps industrial waste and general waste, it is necessary to prevent wastewater leaking from the disposal site from penetrating underground and causing environmental pollution. It is obliged to implement a seepage control on the bottom of the building. As such a water shield, certainty, safety,
From the viewpoints of workability, economy and the like, a method of laying a soft synthetic resin-based or rubber-based water impermeable sheet has been adopted. In addition, a water-blocking sheet is installed on the bottom of facilities that store water in recesses such as water hazards, simple reservoirs, ponds, and pools at golf courses in order to prevent leakage of stored water, similarly to waste disposal sites. Is done. Further, in an underground structure or the like, a waterproof sheet may be laid over the structure in order to prevent groundwater or the like from leaking into the structure.

[0003] It is difficult to cover these water-impervious sheets at once with a single water-impervious sheet covering the bottom of a storage facility such as a waste disposal site or a reservoir having a large area or the periphery of a structure. Therefore, at the site, the divided parts are joined and integrated at the site by welding or crimping with an adhesive, etc., and the impermeable sheet is used for the waste disposal site, storage facility or underground structure And so on to cover the whole area.

[0004]

However, the above-mentioned method of joining and integrating the plurality of divided water-impermeable sheets on site may cause a joining failure, and waste water or stored water may be generated from a defective portion due to the joining failure. There was a problem that it could leak.

Further, various methods have been proposed to detect such a defective portion. However, these methods have a problem that the defective portion cannot be easily and quickly detected and specified on site.

Accordingly, the present invention has been made in view of such a conventional problem, and it is possible to easily, quickly and easily perform a detection operation on site, and to accurately detect and specify a defective portion. It is an object of the present invention to provide a method for detecting a defective portion of a joint portion of a waterproof sheet that can be performed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the gist of the invention is to join a water-impervious sheet for detecting a defective portion in a joint portion of an laid water-impervious sheet. A method for detecting a missing portion of a part, wherein the bonding part is covered with a predetermined length in an extending direction of the bonding part, and an airtight adhesive tape is attached to an upper surface of the water-impermeable sheet. Is formed with the hermetic adhesive tape to form a sealed ventilation space extending along the end face, suctions or pressurizes the sealing ventilation space, and detects a pressure change in the sealing ventilation space after the suction or pressurization. Accordingly, there is provided a method for detecting a defective portion of a joint portion of a water-blocking sheet, wherein the presence or absence of a defective portion of a joint portion of a portion covered with the airtight adhesive tape is detected.

Further, in the method for detecting a defective portion of a joint portion of a water-impermeable sheet according to the present invention, when a defective portion of the joint portion is detected, the length covering the joint portion with the airtight adhesive tape is sequentially shortened. It is preferable that the presence or absence of the missing part is continuously detected while identifying the position of the missing part.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a waste disposal site 10 in which a water-impervious sheet 11 is laid on the entire bottom surface while employing the method for detecting a defective portion of a joint part of a water-impervious sheet according to the present invention. That is, the waste disposal site 10 is formed by, for example, excavating a large site in a mountainous region or the like in a concave shape.
1, a sand mat 12 as a protective mat is laminated thereon, and thereafter, the waste H is dumped and buried above these.

The water-blocking sheet 11 is made of, for example, a soft synthetic resin or rubber-based sheet member. However, as a single sheet, it is not possible to cover the entire bottom surface area of the vast waste disposal site 10 at one time. Therefore, at the work site, as shown in FIG. 2, a unit waterproof sheet of a predetermined size suitable for construction is overlapped with its end by, for example, welding or crimping via an adhesive, and a joint is formed. 13 and are integrated into a size that can cover the bottom surface of the waste disposal site 10.

The method for detecting a defective portion in this embodiment is used to detect a defective portion in the joint 13. That is, in order to perform such a detection method, as shown in FIG. 3, first, the joint 13 is covered with a predetermined length, for example, about several meters to several tens of meters along the extension direction of the joint 13, and An airtight adhesive tape 14 is attached to the upper surface.
Due to the adhesion of the airtight adhesive tape 14, the end face of the joint portion 13, that is, the end face of the water-blocking sheet 11 located on the upper side, has a closed ventilation extending along the end face due to the thickness of the water-blocking sheet 11. A space 15 is formed. Further, both ends of the closed ventilation space 15 are hermetically sealed, and as shown in FIG. 4, a pressure-resistant hose 16 for vacuum suction of the closed ventilation space 15 or pressurized injection of air is provided at one end. Insert The pressure-resistant hose 16
Is connected to a vacuum pump 17 or a compressor 18 and is provided with a pressure gauge 19 in the middle thereof. The airtight adhesive tape 14 that covers the joining portion 13 and is attached to the upper surface of the water-impervious sheet 11 has, for example, an adhesive on the entire lower surface thereof,
It is also possible to use one having an adhesive only on the lower surface side portion, which is the portion directly adhered to the substrate. Also, joint 1
When the airtight adhesive tape 14 is applied to cover the airtight adhesive tape 3, a vent pipe made of, for example, perforated plastic or the like is disposed on the end surface of the waterproof sheet 11 at the joint 13, and the airtight adhesive tape is wound around the pipe. By disposing 14, the closed ventilation space can be more reliably formed and held by the ventilation pipe.

When these mounting operations are completed, the closed ventilation space 15 is then brought into a negative pressure state or a pressurized state by using the vacuum pump 17 or the compressor 18. That is, when the vacuum pump 17 is used, the compressor 1
When 8 is used, air is fed into the closed ventilation space 15 to set each pressure state, and the state is left for a while in this state, and a change in pressure is observed by the pressure gauge 19. When the decrease in the negative pressure or the pressure is detected, the airtight adhesive tape 14 is detected.
It is found that there is a defective portion in any part of the joint 13 covered by.

When the pressure gauge 19 detects a decrease in the negative pressure or the pressing force, the same detecting operation is performed while the length of the airtight adhesive tape 14 covering the joining portion 13 is gradually reduced. . That is, since the hermetic adhesive tape 14 and the pressure-resistant hose 16 can be easily attached and detached, the area for performing the detection operation is sequentially reduced, and the presence or absence of a pressure change is confirmed. It is possible to accurately specify the position where the defective portion exists in the portion 13.

In the above-described embodiment, a case has been described in which a waterproof sheet is laid at a waste disposal site. However, the present invention is not limited to this. Water hazards at golf courses, simple reservoirs, reservoirs, pools, etc. The present invention can be applied to a case where a water-impervious sheet is laid on the bottom surface of a facility that stores water in a recess such as a case where a water-impervious sheet is laid around an underground structure.

[0015]

As described above in detail, according to the method for detecting a defective portion of a joint portion of a water impermeable sheet according to the present invention, the sealing formed on the end surface of the water impermeable sheet by covering the joint portion with an airtight adhesive tape. With a simple configuration in which the ventilation space is suctioned or pressurized and a change in the pressure state of the closed ventilation space is detected, it is possible to easily and quickly detect the presence or absence of a defect at the site.

Further, by successively checking the presence or absence of a defect while sequentially shortening the length covering the joint with the airtight adhesive tape, the position where the defect exists can be specified with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a waste disposal site on which a water-impermeable sheet is laid using the method for detecting a defective portion of a joint portion of a water-impermeable sheet according to the present invention.

FIG. 2 is an enlarged view of a main part showing a laying state of a seepage control sheet.

FIG. 3 is a cross-sectional view showing one embodiment of a method for detecting a defective portion of a joint portion of a water-impervious sheet according to the present invention.

FIG. 4 is a plan view of FIG. 3 as viewed from above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Waste disposal site 11 Waterproof sheet 13 Joining part 14 Airtight adhesive tape 15 Sealed ventilation space 16 Pressure-resistant hose 17 Vacuum pump 18 Compressor 19 Pressure gauge

Continuation of the front page (58) Fields investigated (Int. Cl. ⁶ , DB name) G01M 3/00-3/40 B09B 1/00 E02B 3/12 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. A method for detecting a defective portion in a joint portion of a water-impervious sheet for detecting a defective portion in a joint portion of an laid water-impervious sheet, the method comprising covering the joint portion for a predetermined length in a direction in which the joint portion extends. An airtight adhesive tape is stuck on the upper surface of the water-impervious sheet, and a sealed ventilation space extending along the end surface is formed on the end face of the water-impervious sheet at the joint portion by the airtight adhesive tape. By suctioning or pressurizing the space, and detecting a change in pressure in the closed ventilation space after the suctioning or pressurization, it is possible to detect the presence or absence of a defective portion in a joint portion covered by the airtight adhesive tape. A method for detecting a defective portion in a joint portion of a water-impervious sheet. 2. When a defective portion of the joint is detected, the length of covering the joint with the hermetic adhesive tape is sequentially reduced, and the presence or absence of the defective portion is continuously detected while the position of the defective portion is detected. 2. The method of claim 1, wherein
3. A method for detecting a defective portion in a joint portion of a water-impervious sheet according to (1).