JPH0524116A - Method for inspecting fault of connection part of water-barrier sheets - Google Patents

Abstract

PURPOSE:To inspect the fault of the connection part of water-barrier sheets by accurately judging the fault part of the connection part without blocking the passage provided to the connection part even if load is applied to the connection part. CONSTITUTION:A space like passage 4 is formed to the connection part 1 of water-barrier sheets by interposing a bonding material 5 and an auxiliary material 6 between both sheets. The needle part provided to a blower is inserted in the passage 4 and smoke is sent into the passage 4 from the needle part to observe a place where the smoke flows out to the outside of the connection part 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inspecting a defect of a water-blocking sheet joint, and more specifically, forcibly sending smoke or gas to a passage previously formed in the water-blocking sheet joint, and the smoke or gas This is a method for inspecting a defect in a water-blocking sheet joint to check a defective portion in the water-blocking sheet joint by observing how it flows out of the joint.

[0002]

2. Description of the Related Art Conventionally, a proper inspection of a water-impermeable sheet joint is performed by performing an adhesion test of the joint by a sampling test, or at the construction site, air is pressed into the water-impervious sheet joint at a non-adhered portion to keep it constant. After maintaining a constant pressure for a period of time, it was evaluated that the outflow of air did not occur unless the pressure decreased. However, this method is suitable for water-proof sheets made of synthetic resin such as vinyl chloride, but on sheets made of rubber or the like, the joints are in an adhesive state and the modulus is comparatively low, resulting in a defective state. Even if it is not done, the pressure may decrease, and there is a problem that the defective portion cannot be correctly determined.

As another method, there is a method in which an ultrasonic inspection machine is brought into contact with a joint portion to detect a defective portion. This method is suitable for a resin sheet, but a heterogeneous adhesive layer is interposed. There was a problem that it could not be applied to the case of the rubber sheet.

In order to improve this, the present applicant inserts a needle portion equipped with a smoke blower into the unattached portion of the water-impermeable sheet joint portion made in advance, and sends smoke through the through hole of the needle portion. After that, a method of observing the outflow location of the smoke to the outside of the sheet was proposed. (Disclosed in JP-A-63-182134)

[0005]

This method has some effects, but the joint is pressed down by the weight of the upper and lower water-blocking sheets and the walking of the work clothes, and the space part of the non-wearing part disappears and smoke is generated. There was a problem with the passage being blocked. That is, in the joining portion, the separated joining tapes may be deformed by pressure and adhere to each other, or the upper and lower water-blocking sheets may come into contact with each other to make the passage extremely narrow.

The present invention solves the problems of the conventional inspection method as described above. Even if a load is applied to the joint of the water-blocking sheet, the joint can be accurately joined without blocking the passage provided in the joint. An object of the present invention is to provide a method for inspecting a defect of a water-blocking sheet joint, which can determine a defective portion of a portion.

[0007]

That is, as one of the features of the present invention, as one of them, a space-like passage is formed in a water-impermeable sheet joining portion by interposing a joining material and an auxiliary material. After inserting the needle part of the blower into the passage and sending the smoke into the passage from the through hole of the needle part, the method of inspecting the water-impermeable sheet joint part, which inspects the place where the smoke flows out of the joint part is there.

As another one, a space-like passage is formed by interposing a bonding material and an auxiliary material in the water-impermeable sheet joint, and soap water is applied to the surface of the water-impermeable sheet joint. rear,
In this method, a needle portion equipped with a blower is inserted into this passage, gas is sealed from the needle portion, and the location where bubbles of soapy water are generated is observed.

[0009]

According to the inspection method of the present invention, even if a load is applied to the joint portion of the water-impervious sheet, the auxiliary material intervenes together with the joint material. Alternatively, the joining of the joining materials is prevented to maintain the space-like passage. For this reason, if a needle portion of a blower is inserted into the passage of the water-blocking sheet joint and a predetermined amount of smoke is sent into the space of the unattached portion, the smoke enters the passage of the sheet, and if there is a defective portion, Flows out from the defective part. This allows the smoke outflow portion to be inspected and the defective portion to be appropriately processed. Further, in this inspection method, it is not necessary to increase the air pressure because smoke is used, and thus the bonded portion of the rubber sheet is not destroyed. Of course, after applying soap water to the surface of the joint portion, gas can be enclosed in this passage, and the inspection can be performed by generating bubbles of soap water.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the water-impermeable sheet joint portion, and FIG. 2 is a plan view thereof. In the joint portion 1 shown here, the ends of the upper water-impervious sheet 2 and the lower water-impervious sheet 3 are overlapped with each other, and the joining materials 5 and 5 are used to form the space-like passages 4 therebetween. The auxiliary members 6 are provided in the passage 4 at regular intervals in the width direction. The surface of the obtained joint portion 1 has a slight step portion 7.

The bonding material 5 is not particularly limited. For example, in the case of a vulcanized rubber sheet, a natural vulcanization type rubber tape or a resin film is used, and in the case of a thermoplastic resin, a thermoplastic elastomer, etc. It is joined by heat fusion. In particular, the present invention is effective when joining the water-impervious sheet on site, and therefore it is preferable to use a natural vulcanization type rubber tape. The thickness of this tape is 0.5 ~
10 mm wide with a width of 40 to 200 mm and 2.0 mm
Two narrow types of 40 mm are used.

The auxiliary material 6 used here holds the space of the passage 4, and is, for example, a rope made of a fiber material, a linear rubber elastic body, a nonwoven fabric, a mat, a breaker or the like. The auxiliary material 6 is installed on the side of the bonding material 5 having a narrow width, and smoke or gas is caused to flow to the side of the bonding material 5 having a wide width to facilitate the inspection of the defective portion of the bonding portion 1.

The water-blocking sheets 2 and 3 include, for example, ethylene-propylene terpolymer (EPT), butyl rubber (IIR) or a vulcanized rubber composed of a blend of EPT and IIR, vinyl chloride, vinyl acetate, etc. It is made of a plastic resin, a thermoplastic elastomer, or rubberized asphalt.

Therefore, in the method of the present invention, the needle portion 10 attached to the blower 9 for ejecting smoke is inserted into the passage 4 provided in the joint portion 1, and the blower 9 is operated to enclose the smoke from the needle portion 10. . As shown in FIG. 3, this blower 9 has a cylindrical needle portion 10 having a through hole, a smoke tube box 11 and an air injector 12 such as a hand pump, which are connected by a pipe 13, respectively. A pressure gauge 14 is provided between the tube boxes 11. White, yellow, etc. smoke generated in the smoke tube box 11 is caused by the wind pressure of the air injecting machine 12 to cause the needle 1
Eject from the tip of 0.

That is, according to the inspection method of the present invention, first, after inserting the needle portion 10 of the blower 9 into the passage 4 provided in the longitudinal direction of the prefabricated water-impermeable sheet joint, the blower 9 is operated to smoke. Is forcibly sent into the space of the passage 4. When the space portion of the passage 4 reaches a predetermined pressure due to the sent-in smoke, the smoke advances to the unattached area between the sheets and may flow out of the joint portion 1 in some cases, whereby the location of the defective portion becomes clear. become.

The air blowing pressure generated by the air injector 12 is about 0.1 kg / cm ² or less, and if it exceeds this, there is a possibility that the upper and lower water-blocking sheets 2, 3 will be peeled off. is there. Further, although the needle portion 10 is a tubular body, it has a sharp tip and is easy to insert, and is similar to, for example, the needle shape of a syringe.

The passage 4 has a width of 5 cm or less and a length of about 1 to 1.
It is preferable to carry out in units of 20 m, and a weight can be placed at the end of this length to close the passage 4, or the passage 4 of a predetermined length can be completely sealed by the bonding material 5. When the width of the passage 4 exceeds 5 mm, the joint portion 1 is pressed down by the weight of the upper waterproof sheet 2 and the running of the builder, and the upper and lower waterproof sheets 2 and 3 come into close contact with each other to block the passage 4. To be done. Further, the auxiliary material 6 may be extracted from the passage 4 after the inspection is completed.

Further, as another method, as shown in FIG. 5, soap water 15 is applied to the surface of the joint portion 1, and then the needle portion 10 is inserted into the passage 4 of the joint portion 1 as described above. Blower 9
Then, a gas such as air is sealed in and the place where bubbles of soapy water are generated may be observed. In this case, it is not necessary to use smoke as gas.

Next, a specific example of the inspection method of the present invention will be described. 1.0 to 1.5 m in thickness at the joint part (width 150 mm) of the water-blocking sheet mainly composed of EPT having a thickness of 1.5 mm.
m, 100 mm wide natural vulcanizing type adhesive tape and 30 mm wide natural vulcanizing type adhesive tape with a width of 3 cm and a polyester fiber diameter of about 1.5 mm. The rope was inserted close to the end face of the narrow adhesive tape to form a space-like passage. Then, the bonded portion is rolled by a roller (linear pressure: 0.
It was pressure-bonded at 5 kg / cm) to obtain a joint portion having a length of 10 m.
Both ends in the lengthwise direction of the passage were sealed with the above-mentioned adhesive tape, and at the same time, a defective portion for communicating the outside of the sheet with the passage was intentionally provided.

When the above-mentioned pressure-sensitive adhesive tape is naturally vulcanized to bond the water-blocking sheet to each other, about 10 parts from one end to the other end of the joining part are joined.
After being walked by the worker for m, the blower was brought in, the needle part of the blower was inserted into the passage of the water blocking sheet, and the blower was operated to send the smoke generated in the smoke tube into the passage from the needle part. When a predetermined amount of smoke was sent, it was observed that the smoke in the passage moved and flowed out from the defective portion to the outside, and the defective portion was clarified.

As another method, after the worker is made to walk along the length of the joint, soap water is applied to the step area of the joint and the blower blows the inside of the passage in the same manner as described above. Enclosed with air. As a result, generation of bubbles was observed from the defective portion, and it was revealed that the passage was not blocked even when a load was applied.

[0022]

As described above, according to the inspection method of the present invention, since the auxiliary material is interposed in the passage of the prefabricated water-impermeable sheet joint, the passage is opened even if a load is applied to the joint. Since there is no interruption, it is possible to accurately inspect the defective portion of the joint.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a water-impermeable sheet joint portion.

FIG. 2 is a plan view of a water-impermeable sheet joint portion of FIG.

FIG. 3 is a perspective view of a blower used in the method of the present invention.

FIG. 4 is a cross-sectional view of a water-impermeable sheet joining portion showing the method of the present invention.

FIG. 5 is a cross-sectional view of a waterproof sheet joining portion showing another method of the present invention.

[Explanation of symbols]

1 joint 2 Upper waterproof sheet 3 Lower waterproof sheet 4 passages 5 Bonding material 6 auxiliary materials 7 Step 9 blower 10 needles 11 smoke tube box 12 Air injection machine

Claims (3)

[Claims] 1. A space-like passage is formed in a water-impervious sheet joint by interposing a joining material and an auxiliary material, and a needle portion provided in a blower is inserted into the passage, and smoke is emitted from the needle portion to the passage. A method for inspecting a defect in a water-impermeable sheet joint, which comprises observing a portion where the smoke flows out of the joint after being sent. 2. A space-like passage is formed in the water-impervious sheet joint by interposing a joining material and an auxiliary material, soapy water is applied to the surface of the joining portion, and a blower is provided in this passage. A method for inspecting a defect in a water-impermeable sheet joint, comprising inserting a needle portion, enclosing a gas from the needle portion into a passage, and observing a location where bubbles of soapy water are generated. 3. A bonding material having a large width and a bonding material having a narrow width are arranged at intervals at a bonding portion of a water-impervious sheet to form a space-like passage, and an auxiliary material is used for the bonding material having a narrow width. The method for inspecting a defect in a water-impermeable sheet joint portion according to claim 1 or 2, which is located close to the water-impermeable sheet.