JPH031797Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water leakage testing device for testing water leakage at joints in water pipe systems, such as drainage pipe systems in multilayered structures.

In general, after a water pipe system, particularly a drainage pipe system, is installed in a building, it is necessary to inspect the joints of the pipes for water leakage.

Conventionally, the drain pipe is blocked in the middle and the area above the blockage is filled with water to check for water leakage at the joint.The testing tool used for this test has one end connected to the fluid supply source. The other end of the connected hose is equipped with an air bag that can be expanded and contracted by supplying and discharging fluid.

Then, an air bag is inserted into the drain pipe, and a fluid such as compressed air is injected into the air bag through a hose to inflate the air bag, and the air bag is brought into close contact with the inner surface of the drain pipe to block the pipe, and the blocked area is removed. The upper part is filled with water to check for water leakage at the joint.

However, since the above-mentioned testing device usually has a structure in which the air bladder is connected to the other end of the hose via a tightening device such as a band, the connection point is relatively weak, and the connection point cannot withstand water pressure during inspection. , it may break. Further, since a tightening tool such as a band is required, there is a problem that the number of parts increases and the cost increases. Furthermore, there is a problem in that the seal between the air bag and the inner wall of the tube is relatively poor, and the air bag is fixed to the tip of the hose, making it difficult for the hose to enter the tube smoothly.

The present invention was devised to solve the above problems, and its purpose is to withstand water pressure, reduce the number of parts, and provide good sealing performance when the bag is inflated. To provide a water leakage testing tool that allows a hose to be smoothly inserted into a pipe.

That is, the present invention includes a pipe section 1a formed of a flexible and elastic material, one end of which is connected to a fluid supply source; In a water leakage testing tool for a water pipe system, which is comprised of a bag-shaped water stopper 1b that expands and contracts as fluid is supplied and discharged, a water stopper is provided at the tip of the pipe 1a with a thinner inner thickness of the pipe 1a. The water stop portion 1 is integrally provided with the water stop portion 1b.
The wall part b has a plurality of ring-shaped protrusions 1b' that protrude outward so as to come into close contact with the inner wall surface of the pipe when inflated, and the tip of the water stop part 1b has a spherical outer surface. The basic structure of the invention is that each thick portion is provided.

As mentioned above, in this invention, the pipe part and the water stop part are integrally formed and there is no connecting point between the two, so
It can withstand water pressure sufficiently during inspection. or,
Fasteners such as bands are no longer required, leading to cost reduction. Furthermore, the sealing performance of the water stop part is improved, and the capacity for inserting the hose into the pipe is also increased.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is an enlarged partial vertical cross-sectional view of a water leakage testing device 1 showing a first embodiment of the present invention, in which 1a is a pipe portion and 1b is a water stop portion.

The pipe portion 1a is formed into a cylindrical shape from a flexible and elastic material such as rubber, and one end thereof is connected to a fluid supply source (not shown) such as a compressor.

On the other hand, the water stop portion 1b has a bag-like shape and is integrally connected to the tip of the pipe portion 1a using the same material. Further, the water stop portion 1b is set to have a wall thickness thinner than that of the pipe portion 1a so that it expands and contracts when a fluid such as compressed air is supplied and discharged from a fluid supply source. Further, protrusions 1b' are formed at two locations on the outer peripheral surface of the water stop portion 1b as shown in FIG.
When the water stop portion 1b expands, the protruding portion 1b' is brought into close contact with the inner surface of the tube. The number of protrusions 1b' is not limited to this embodiment, and may be formed at three or more locations.

In this embodiment, the wall thickness at the tip of the water supply section 1b is increased. Therefore, the water stop portion 1b has a hard tip and can move smoothly inside the pipe.

Further, the material of the test tool is not limited to the above embodiments, but any material may be used as long as it has flexibility and elasticity and expands and contracts when fluid is supplied and discharged.

Next, a case will be described in which the water leakage test tool 1 is used to test for water leakage in a water pipe system, for example, a drainage pipe system of a multilayer structure.

First, the water stop part 1b and the pipe part 1a of the inspection tool 1 are inserted into the drain pipe 3 (5 inch to 6 inch diameter) installed through the floorboard 2 of each floor of the multi-layered structure. At this time, since the tip of the water stop portion 1b is hard, it descends smoothly inside the drain pipe 3. When the water stop portion 1b reaches below the joint portion 3a of the drain pipe 3 as shown in FIG. 3, the pipe portion 1a stops being extended. Next, compressed air a (pressure 1.5Kg/cm ² to 3
Kg/cm ² ) into the water stop part 1b.
is expanded as shown in FIG. 2 and brought into close contact with the inner surface of the drain pipe 3. At this time, since the protruding portion 1b' of the water stop portion 1b comes into close contact with the inner surface of the drain pipe 3, the sealing is performed well and reliably. Thereafter, water is poured into the drain pipe 3 to fill the portion above the water stop portion 1b with water, and the presence or absence of water leakage from the joint portion 3a is inspected.

When the test is completed, the air in the water stop section 1b is removed. When the air in the water stop part 1b is removed, a gap is created between the water stop part 1b and the inner surface of the drain pipe 3, and water is discharged downward. After the water is drained, pull up the water stop part 1b.

Incidentally, if there is a branch pipe 3b within the range to be inspected, the branch pipe 3b is closed with a blind lid or the like and the inspection is performed.

In the above embodiment, compressed air is injected into the water leakage testing tool 1 to expand the water stop portion 1b, but in other embodiments, water is injected into the water leakage testing tool 1. Alternatively, the water stop portion may be expanded. In this case, since the water in the water stop part must be discharged after the water leak test, the water leak test tool is provided with a mechanism that can appropriately discharge the water in the water stop part. That is, this mechanism includes a discharge port 4 formed at the tip of the water stop part 1b, a valve 5 disposed inside the water stop part 1b that can open and close the discharge port 4, and an operation that can remotely control the valve 5. consisting of means.

The valve 5 includes a valve box 5a having a conical valve seat and an inlet and an outlet, a conical valve body 5b that can be seated and removed from the valve seat, and a valve body 5a that is connected to the valve body 5b. A valve stem 5c is attached to the valve so as to be movable up and down,
It is comprised of a compression spring 5d that is interposed between the valve body 5a and the valve body 5b and urges the valve body 5b toward the valve seat to keep the valve in a normally closed state. This valve 5 is arranged and fixed in the water stop part 4 so that the outlet of the valve box 5a communicates with the discharge port 4 of the water stop part 1b.

In this embodiment, a wire rope 6 is used as the operation means for remotely controlling the valve 5, and the wire rope 6 is movably inserted into the water stop part 1b and the pipe part 1a. That is, the wire rope 6 has one end connected to the valve stem 5c of the valve 5, and the other end protrudes outward from the base end side of the pipe portion 1a and is movably supported by the pipe portion 1a. A sealing material is interposed in the pipe portion 1a from which the wire rope 6 projects. In this embodiment, the base end side of the pipe portion 1a is branched, one of which is connected to a fluid supply source such as a pump, and the wire rope 6 is inserted through the other.

When performing a water leakage test on a drain pipe system using the water leakage testing tool, the valve 5 is opened and water b is injected into the water stopper 1b to inflate the water stopper 1b. to make it stick tightly to the inner surface of the drain pipe 3. After that, water is injected into the drain pipe 3 to perform a water leakage test. When the inspection is completed, the wire rope 6 is pulled to open the valve 5, and the water in the water stop portion 1b is discharged from the discharge port 4. When the water in the water stop part 1b is discharged, the water stop part 1b contracts and the water in the drain pipe 3 is discharged downward.

In addition, in the water leakage test tool 1, compressed air can also be used as the fluid.

Further, the valve 5 is not limited to the one in the above embodiment, and may have any structure and shape as long as it can open and close the discharge port 4 of the water stop portion 1b as appropriate.

Furthermore, the operating means that can remotely control the valve 5 is not limited to that of the above embodiment.

As mentioned above, the water leakage test device of the present invention has a pipe part for supplying and discharging fluid and a water stop part that can block the pipe line, which are integrally formed, so there are no connecting points between the two, and the strength can be improved. . As a result, it can sufficiently withstand water pressure during inspection. Furthermore, since the pipe portion and the water stop portion are integrally formed, there is no need for a tightening device such as a band as in the conventional case. As a result, the number of parts can be reduced and costs can be reduced.
Furthermore, in the present invention, the wall surface of the water stop section is provided with a plurality of ring-shaped protrusions that protrude outward so that it comes into close contact with the inner wall surface of the pipe when it is expanded, so that there is a gap between the inner wall surface of the pipe line and the water stop section. The sealing performance of the pipe is significantly improved, and the test water pressure of the pipe can be increased accordingly.

Furthermore, in the present invention, since the water stop part has a thick walled part with an approximately spherical outer surface at the tip, even when the hose is pushed into the pipe,
The thick portion functions as a guide, allowing the distal end of the hose to be inserted into the pipe very smoothly.

[Brief explanation of the drawing]

Fig. 1 is an enlarged partial vertical cross-sectional view of a water leakage testing tool showing the first embodiment of the present invention; Fig. 2 is an enlarged partial longitudinal cross-sectional view of the water leakage testing tool with the water stop portion in close contact with the inner surface of the drain pipe; Figure 3 is a partial vertical sectional view of the water leakage testing tool according to the first embodiment set in a drain pipe, and Figure 4 is an enlarged partial vertical sectional view of the water leakage testing equipment showing the second embodiment of the present invention. Figure 5 is an enlarged vertical cross-sectional view of the main parts.
FIG. 6 is a partial vertical cross-sectional view of a water leakage test device according to the second embodiment set in a drain pipe. 1 is a water leakage test tool, 1a is a pipe part, and 1b is a water stop part.

Claims (1)

[Scope of utility model registration request] A pipe section 1a formed of a flexible and elastic material, one end of which is connected to a fluid supply source; A pipe section 1a that is disposed at the tip of the pipe section 1a and expands when fluid is supplied and discharged from the fluid supply source. In a water leakage testing device for a water pipe system, which is composed of a contractible bag-shaped water stop part 1b, the water stop part 1b, which is formed by reducing the inner thickness of the pipe part 1a, is integrally provided at the tip of the pipe part 1a. In addition, a plurality of ring-shaped protrusions 1b' that protrude outward and stick to the inner wall surface of the pipe during expansion are provided on the wall of the water stop part 1b.
A water leakage test tool for a water pipe system, characterized in that a thick walled portion having a spherical outer surface is provided at the tip of (b).