JPS63182134A - Inspecting method for connected part of water preventing sheet - Google Patents

Abstract

PURPOSE:To enable a defect in the connected part of a water preventing sheet to be accurately judged by a method in which the needle part of a smoke fan is inserted into the portion not yet stuck in the connected part of the water preventing sheet, and after smoke has been sent from the throughhole of the needle part, the position where the smoke flows outside, is inspected. CONSTITUTION:After the needle part of a smoke fan has been inserted into the bandlike portion 4 which is not yet stuck in the connected part of a water protecting sheet preliminarily made, the smoke is forcedly sent into the space of the portion 4 not yet stuck, operating the smoke fan 5. When the pressure in the space of the portion not yet stuck reaches a prescribed pressure by the smoke having been sent into, the smoke advances into the range, which is not yet stuck, between the sheets, and flows outside from the connected part of the sheets, whereby the position of defect becomes clear. A suitable, blast pressure generated by an air injector 8 is about 0.1kg/cm<2> or less. If the blast pressure exceeds this value, the connected part of the water protecting sheets 1, 1 are possible to be separated. The needle part 6 is a tubular body, but its tip has an acute angle, and its insertion is easy, it resembles, for example, a needle shape of a syringe.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for inspecting a water-shielding sheet joint;
The present invention provides a method for inspecting water-shielding sheet joints, which examines the defective state of water-shielding sheet joints by observing how this smoke flows out.

(Prior art) Conventionally, the adequacy of water-shielding sheet joints has been tested by conducting a sampling test to test the adhesion of the joints, or at the construction site, air is injected into the unattached parts of the water-shielding sheet joints, and air is injected into the unattached parts of the water-shielding sheet for a certain period of time. , After holding a constant pressure, it was evaluated as if air outflow occurred if there was no pressure effect. However, while this method is suitable for water-shielding sheets made of synthetic resins such as vinyl chloride, the joints of sheets made of rubber and other materials are adhesive and have a relatively low modulus, resulting in defects. A reduction in the pressure effect could occur even if the Therefore, even if there was a defect in the joint, the defect status could not be determined.

Furthermore, there is another method in which an ultrasonic inspection machine is brought into contact with the defective part of the joint to detect the defective part, but this method is suitable for resin sheets, but if there is a different adhesive layer intervening. There was a problem in which it could not be applied to rubber sheets that were made of rubber sheets.

(Problems to be Solved by the Invention) The present invention improves the problems of such conventional inspection methods, and in particular provides an inspection method for water-shielding sheet joints that can correctly determine the defective state of the water-shielding sheet joints. The purpose is to provide a method.

(Means for Solving the Problems) That is, the present invention is characterized by inserting the needle of a smoke blower that blows out smoke from the through hole of the needle into the defective part of the water-shielding sheet joint, and blowing out the smoke. A method of inspecting a water-shielding sheet joint includes inspecting the state of the smoke flowing out to the outside after feeding the water-shielding sheet.

(Function) According to the inspection method of the present invention, when the needle of the smoke insertion machine is inserted into the unattached part of the water-shielding sheet joint and a predetermined amount of smoke is sent into the space of the unattached part, the smoke is removed from the sheet. Enter the unreached area of
In some cases, it leaks out of the seat. This makes it possible to inspect the smoke outflow location and appropriately treat defective locations. In addition, this inspection method does not require a large air pressure due to the use of smoke, which does not destroy the bonded portion of the rubber sheet.

Hereinafter, specific embodiments of the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an example of the inspection method of the present invention,
Between the joint part (2) of the water-blocking sheets (1) and (1), there is an adhesive layer (for example, naturally vulcanizable rubber tape, olefin thermoplastic resin film, or ordinary adhesive) between the joint part and the joint part (2). 3) is involved. If there is a defective part (4) of the unattached part in this joint part (2), a smoke blower (5) is used that blows out smoke from the through hole of the needle part, but this smoke blower (5) A cylindrical needle (6) with a through hole, a smoke tube (7), and a compressor (8) are connected by a pipe (9), and the white, yellow, etc. smoke generated in the smoke tube (7) is sent to the compressor. According to (8), the air is ejected from the tip of the needle (6) due to the generated wind pressure.

That is, according to the inspection method of the present invention, first, the needle part (6) of the smoke blower (5) is inserted into the defective part (4) of the water-shielding sheet joint, and then the smoke blower (5) is operated to force the smoke. into the space of the defective part (4). When the space in the defective area reaches a predetermined pressure due to the smoke sent in, the smoke further advances into the unattached area between the sheets and flows out of the sheet, thereby revealing the condition of the defective area (4). Become.

The air pressure generated by the compressor (8) is approximately 0.
, 1 kg/cm2 or less is sufficient; if it exceeds this, there is a possibility that the adhesive part of (1) (1) may peel off. Further, although the needle portion (6) is a tubular body, the tip thereof has an acute angle for easy insertion, and has a shape similar to, for example, the needle of a syringe.

Moreover, a water-blocking sheet (1) applied in the method of the present invention
Examples include ethylene-propylene terpolymer (ETP), butyl rubber (IIR) or EPT and I
It consists of a vulcanized rubber made of a blend of IR, a thermoplastic resin such as vinyl chloride or vinyl acetate, a thermoplastic elastomer, or rubberized asphalt. The adhesive layer (3) used at the joint part of the water-blocking sheet is not particularly limited; for example, in the case of a vulcanized rubber sheet, a naturally vulcanized rubber tape or a resin film may be used; In the case of thermoplastic resins, thermoplastic elastomers, etc., they are joined by thermal fusion.

In addition, in the method of the present invention, the defective part (4) of the water-blocking sheet
In the case of a rubber sheet, the width is preferably 5 cm or less and the length is 5 m or less, while in the case of a resin sheet, the width is 2 cm or less and the length is 10 m or less.

Next, a specific example of the inspection method of the present invention will be described.

Example 1.0 to 1.5 mm thick at the joint (width 3.Q mm) of a vulcanized rubber sheet mainly composed of ETP with a thickness of 1 and 5 mm.
A naturally vulcanized adhesive tape with a width of 3 Q mm and a Mooney viscosity of 15 was interposed, and roller rolling pressure (linear pressure Q, 5 kg/cm) was applied.
) and left at an environmental temperature (25 to 35° C.) at which the naturally vulcanizing type tape vulcanizes. In addition, in order to create an unattached part of the sheet at the above joint, the width is 3 cm and the length is 2.
The above-mentioned adhesive tape was not interposed for about m.

After the adhesive tape is cured and the vulcanized rubber sheets are joined together, the smoke blower shown in Figure 1 is brought in, the needle of the blower is inserted into the unattached part of the vulcanized rubber sheet, and the compressor is activated. Then, the smoke generated by the smoke tube was sent into the unattached part from the needle part. When a certain amount of smoke is delivered,
Smoke within the unattached portion was observed to migrate and flow out from the edge of the joint, revealing the extent of the defect.

(Effects) As described above, according to the inspection method of the present invention, when a predetermined amount of smoke is sent into the defective part of the water-shielding sheet joint, it is observed that the smoke enters the unattached area and flows out to the outside of the sheet. In addition, since the visible smoke is sealed inside the defective area, it can be sufficiently observed even under low pressure, so even if the adhesion of the water-shielding sheet is low, it will not cause any damage to the defective area. It has the effect of being able to be tested without giving anything.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the inspection method of the present invention. (1)...Waterproof sheet (2)...Joint part (4)...
・Defective part (5)...Smoke blower (6)...Needle Patent applicant Mitsuboshi Belting Co., Ltd. Figure 1 procedural amendment (voluntary) March 23, 1988

Claims (1)

[Claims] 1. Insert the needle of a smoke blower that blows out smoke from the through-hole of the needle into the defective part of the water-shielding sheet joint, and after blowing in the smoke, check the flow of the smoke to the outside of the sheet. A method for inspecting water-blocking sheet joints, which is characterized by observation.