JPH0712784A - Inspection device for waterproof sheet connection - Google Patents

Abstract

PURPOSE:To accurately inspect a connected condition for making judgement about the acceptance or rejection thereof by applying a specific type of a contact medium to a connected section, and irradiating the section with an ultrasonic wave for inspection via the medium from a specific direction. CONSTITUTION:A glycol 5 such as ethylene glycol is applied to the upper surface of one side of the lap connection (connection with adhesive) of two connected sheets, for example, ethylene propylene diene waterproof rubber sheets 1 and 2. Also, an ultrasonic probe 4 corresponding to the ultrasonic wave receiving section of an ultrasonic inspection device is kept in close contact with the applied contact medium 5. Then, an ultrasonic wave is applied to the connected section of the sheets 1 and 2 at an orthogonal angle for inspection. When the ultrasonic wave is applied to a waterproof sheet connection having a bonding defect 3, the wave passes through the upper sheet 2, but is irregularly reflected by and returned from the defect 3. An oscillograph obtainable, therefore, is short and has a spread form with many peaks. Thus, the existence of the defect 3 can be quickly and accurately identified by watching the oscillograph so obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inspecting a waterproof sheet connecting portion.

[0002]

2. Description of the Related Art Buildings, beautiful ponds, waste dumps, etc. where waterproof sheets are installed are vast.

On the other hand, since the waterproof sheet is produced in a factory, it has a sheet width of 1000 mm to 1500 mm and a length of several tens of meters due to restrictions of manufacturing equipment.

For this reason, when a waterproof sheet is constructed on a building, a beautiful pond, a waste dumping site, etc., a large number of connecting portions of the waterproof sheets are inevitably formed on these waterproof sheet constructions.

In these waterproof sheet connecting methods, the waterproof rubber sheet is connected through an adhesive,
Further, the waterproof plastic sheet is connected by heat fusion or organic solvent welding.

Although the waterproof sheet connecting work is performed so that these connecting portions can be completely connected, it is necessary to inspect whether or not these many connecting portions are completely installed after the construction.

However, in the conventional inspection, the sensory inspection of the builder is the mainstream, so there is a concern that a defective portion of the waterproof sheet connecting portion may remain without being repaired due to an incorrect inspection result.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above point, and the purpose thereof is to solve the above-mentioned drawbacks of the prior art and to completely connect the waterproof sheet connecting portion. It is an object of the present invention to provide a method for inspecting a waterproof sheet connecting portion, which can quickly and accurately inspect whether or not it is present.

[0009]

The gist of the present invention is to inspect the connecting portion of the waterproof sheet using ultrasonic waves.

The ultrasonic inspection method used here is practically used for inspection of defective parts of concrete, inspection of cracks of steel frames, etc., but it is also completely examined as an inspection method of connection parts of waterproof sheets. I had never been told, and of course it was not implemented.

As a result of intensive studies, the present inventor has found that an ultrasonic inspection method is possible by specifying the irradiation angle of the contact medium and the ultrasonic wave even in the inspection of the connection portion of the waterproof sheet, and the present invention has been made. It has come.

That is, according to the present invention, water is applied to the connecting portion of the waterproof sheet,
By applying a contact medium such as glycol or oil, and then irradiating the applied connection portion with ultrasonic waves from a right angle method and inspecting it, the adhesiveness of the connection portion of the waterproof sheet can be tested quickly and accurately. It was found that it can be done quantitatively.

Here, the contact medium may be a liquid substance having a wet affinity with the waterproof sheet and excellent ultrasonic permeability, for example, glycols such as ethylene glycol, propylene glycol and polyethylene glycol, glycerin and fluid. Synthetic oils such as paraffin, vegetable oils, mineral oils and silicone oils, creamy substances, water, various aqueous solutions and the like are used.

[0014]

The method for inspecting the waterproof sheet connecting portion of the present invention increases the permeability of ultrasonic waves by applying the contact medium material to the surface of the waterproof sheet connecting portion, and to the connection portion to which the contact medium material is applied. By irradiating ultrasonic waves from the right angle method, it is possible to judge the presence or absence of adhesion defects in the connection part from the oscillography of the ultrasonic wave, and thereby perform the adhesion test of the connection part of the waterproof sheet quickly, accurately and quantitatively. There is something that can be done.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the waterproof sheet connecting portion inspection method of the present invention will now be described with reference to the drawings. FIG. 1 is a sectional explanatory view showing an embodiment of the method for inspecting the waterproof sheet connecting portion of the present invention.

In FIG. 1, reference numerals 1 and 2 denote two connected waterproof sheets, 3 an adhesion defective portion of a connecting portion, 4 an ultrasonic probe,
5 is a contact medium thing.

That is, in the waterproof sheet connecting portion inspection method of the present invention, the contact medium material 5 is applied to one side of the lap connecting portions of the two connected waterproof sheets 1 and 2, and the applied contact medium material 5 is applied. The ultrasonic probe 4 which is in contact with the ultrasonic transmission / reception section of the ultrasonic inspection apparatus is brought into close contact with the surface of the ultrasonic inspection apparatus 5, and ultrasonic waves are radiated at right angles to the connection section for inspection.

The waterproof sheet used here is an ethylene propylene diene waterproof rubber sheet having a thickness of 1.5 mm.
Is. The contact medium 5 is ethylene glycol, and the frequency of ultrasonic waves is 5 MHZ.

FIG. 2 is an oscillograph explanatory view obtained when the inspection method according to the present invention is carried out on a portion of the waterproof sheet connecting portion having no adhesion defect portion 3 of FIG.

FIG. 3 is an oscillograph explanatory view obtained when the inspection method according to the present invention is carried out on the portion of the waterproof sheet connecting portion having the adhesion defective portion 3 of FIG.

2 and 3, the vertical axis represents the depth of the waterproof sheet connecting portion in mm, and the horizontal axis represents the elapsed time from the irradiation of ultrasonic waves.

As can be seen from FIG. 2, when ultrasonic waves are applied to the waterproof sheet connecting portion having no adhesive defect, the ultrasonic waves penetrate through the upper waterproof sheet 2, the connection interface and the lower waterproof sheet 1 and hit the construction surface to bounce off. The resulting oscillograph has a long and sharp shape.

Further, as can be seen from FIG. 3, when ultrasonic waves are radiated to the waterproof sheet connecting portion having the adhesion defective portion 3, the ultrasonic waves penetrate through the upper waterproof sheet 2 but diffusely reflect at the adhesion defective portion 3 and bounce off. As a result, the resulting oscillograph will be short and spread out with several peaks.

The oscillograph thus obtained has the irregular shape as described above due to the existence of the adhesion defect portion 3.

Therefore, if the inspection method of the present invention is applied to the connection portion of the waterproof sheet, the presence or absence of the adhesion defect portion can be inspected quickly and accurately by observing the obtained oscillograph.

Further, if these ultrasonic inspections are graphically processed by a computer, the inspection results in the longitudinal direction of the waterproof sheet connecting portion can be clearly displayed.

FIG. 4 is a computer graphic of an inspection result of a waterproof sheet connecting portion having a width of 4 cm and a length of 16 cm.

In FIG. 4, the white portion shows the existence of an adhesion defect portion.

[0029]

As a result, the method for inspecting a waterproof sheet connecting portion of the present invention is capable of inspecting the presence or absence of an adhesion defect portion quickly and accurately, and is industrially useful.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a method for inspecting a waterproof sheet connecting portion.

FIG. 2 is an adhesion defect portion 3 of the waterproof sheet connecting portion of FIG.
It is an oscillograph explanatory view obtained when the inspection method which concerns on this invention is implemented about the part which does not have.

FIG. 3 is an adhesion defect portion 3 of the waterproof sheet connecting portion of FIG.
It is an oscillograph explanatory view obtained when the inspection method which concerns on this invention is implemented about a certain part.

FIG. 4 is a computer graphic of the inspection result of the waterproof sheet connection part.

[Explanation of symbols]

 1, 2 Waterproof sheet 3 Adhesion defect part 4 Ultrasonic probe 5 Contact medium object

Claims (4)

[Claims] 1. An ultrasonic probe of an ultrasonic inspection apparatus is brought into close contact with a connecting portion of a waterproof sheet, and then ultrasonic waves are applied to the connecting portion to bond defects in the connecting portion of the waterproof sheet. A method for inspecting a waterproof sheet connecting portion, which comprises inspecting the presence or absence of a portion. 2. The method for inspecting a waterproof sheet connecting portion according to claim 1, wherein the connecting portion of the waterproof sheet is inspected by irradiating ultrasonic waves at right angles. 3. The waterproof sheet according to claim 1, wherein a contact medium material is applied on the surface of the connecting portion of the waterproof sheet, and then ultrasonic waves are radiated to the connecting portion in a direction perpendicular to the surface for inspection. Connection inspection method. 4. The method for inspecting a waterproof sheet connecting portion according to claim 1, wherein the applied contact medium substance is a glycol.