JP2003114163A - Leakage inspection device for water piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which enables simple leakage inspection, even in the course of construction before opening a shutoff valve closed after repair of a water leakage spot, new piping work, etc. SOLUTION: This device is a leakage inspection device for water piping, etc., composed of an airtight jacket body 1 having a split portion 2 for covering the periphery of a pipe, a fluid inputting plug 3 and a pressure gauge 4 fitted to the jacket body, a closing means 6 which closes or opens the split portion, and a fastening ring 5 arranged near an end part. The device has a swollen part stretching over between pipe bodies which the jacket body 1 joins, and the closing means 6 is a watertight airtight fastener. The airtight jacket body is flexible synthetic resin or rubber. The inputting plug 3 and the pressure gauge 4 are different bodies, or an integrated body which is branched between the fluid inputting plug and the airtight jacket body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak inspection device for water pipes or the like, which can easily check for leaks from pipe joints such as water pipes and gas pipes.

[0002]

2. Description of the Related Art It is not easy to inspect the location of water leaks in pipes such as water pipes or the like. In Japanese Unexamined Patent Publication No. 6-43065, a buried pipe such as a water pipe that has been inspected and buried is divided into appropriate lengths, and the divided pipes are closed by inserting a stop valve at each end. While blowing air under pressure or vacuum suction to drain water from the pipe part,
Make small-diameter holes at appropriate intervals such as several meters on the surface layer consisting of asphalt layer, concrete layer, or solid soil layer directly above this piping part, and cover the box-shaped cover at each small-diameter hole. After supplying rare gas such as helium gas, which has a smaller specific gravity than air, to the pipe parts that are arranged together and closed, the presence or absence of rare gas in each cover is detected by a rare gas detector. Has proposed a method for detecting water leakage in a buried pipe, which is characterized by detecting a location of water leakage in the buried pipe.

Further, in Japanese Patent Laid-Open No. 2000-130079, three or more measurement points separated from each other in the axial direction of the pipe are installed in a conduit for pumping the liquid, and when the liquid suddenly leaks, the inside of the conduit is The pressure wave at the initial stage of leakage generated in the liquid is detected at each measurement point,
Based on the detection signal at each measurement point, the arrival time difference of the pressure wave from the leakage position to each measurement point is obtained, the pressure wave propagation velocity is calculated from the time difference and the distance between the measurement points, and then,
A conduit leak position detection method has been proposed in which the leak position of the conduit is determined based on the pressure wave propagation velocity, the arrival time difference of the pressure wave, and the distance between measurement points.

[0004]

However, there has not been found a device that can be easily used in the past for inspection after repairing a leaking point of a water supply or at a point where a new pipe is installed. After repairing the leaking point or after opening the new piping work, open the closing valve, put it in a water-passing state and judge the presence or absence of leakage from the wet condition with water.If there is no abnormality, backfill the construction site,
In the case of water leakage, it was not possible to avoid the trouble and inefficiency of closing the main valve and returning to the repair work again, closing the water supply in the vicinity, and adversely affecting traffic. Therefore, the present inventor examined the provision of a device capable of easily performing a leak inspection even during construction before repairing a leaking point or after opening a closing valve that was closed after a new piping operation or the like.

[0005]

As a result of studying the above-mentioned problems, an airtight outer jacket main body having a split portion for covering the outer circumference of the tubular body, a fluid inlet plug and a pressure gauge provided in the outer jacket main body, and This is a leak inspection device for water pipes and the like, which comprises a closing means capable of opening and closing the split portion and a tightening ring near the end portion. Open the split part of the outer jacket body on the outer circumference of the repaired part of the pipe body or the joint part created by new piping, tighten the end part with a tightening ring, pressurize air from the fluid inlet plug provided in the outer cover body, etc. After press-fitting the fluid, the pressure gauge reading when the fluid inlet plug was closed is compared with the pressure gauge reading after a while, and if there is no change, it is determined that there is no leakage. . If the reading of the pressure gauge decreases, it can be determined that there is a leak. In this process, it is necessary to confirm whether or not there is a leak from the portion tightened by the closing means of the split portion or the tightening ring of the leakage inspection device. For that purpose, it is advisable to confirm the presence or absence of leakage by a commonly used method such as applying soapy water, hearing sound, or immersing in water.

In the structure of the airtight outer jacket body, when the outer periphery of the pipe body is covered, there is a bulging portion over both the pipe to be joined and the both ends are in close contact with the outer periphery of the pipe body. A structure having a reduced diameter is preferred. The measurement accuracy is improved by filling the bulging portion with a predetermined amount of fluid. The reduced diameter portions at both ends can be sealed by tightening rings.

As the closing means, for example, Japanese Patent Laid-Open No. 2-4500
No. 5, JP-A-9-262111, a fastener having a structure in which a convex strip provided on one edge and a concave strip provided on the other edge are fitted, and Japanese Patent Laid-Open No. 2000-354505. As shown in Fig. 3, a fastener having a structure in which flexible meshing edge portions are provided on both of the meshed element rows, that is, a watertight and airtight fastener (waterproof chuck) is suitable.

The airtight outer jacket body is preferably made of a flexible synthetic resin or rubber so that it can be easily deployed from the portion of the watertight airtight fastener as the closing means. Examples of flexible synthetic resins include soft polyvinyl chloride, polyethylene, EVA and the like. The rubber is preferably hard from the viewpoint of strength, such as butadiene rubber (BR), natural rubber (NR), and butadiene acrylonitrile rubber (NBR).
Etc., and may be reinforced with synthetic fibers or metal fibers as needed.

The fluid inlet plug and the pressure gauge may be separately provided to the airtight outer jacket body, or as a single body branched from the fluid inlet plug between the airtight outer sleeve body, The structure may be provided collectively in appropriate places.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view of an essential part of a state in which the leak inspection device of the present invention is attached to a water pipe, and FIG. 2 is a sectional view taken along line AA in FIG. As is clear from these figures, the leakage inspection apparatus of the present invention is used by covering and mounting the outer periphery of the pipe body 10 such as a water pipe. Therefore, the airtight outer body 1 is provided with the split portion 2 for covering the outer periphery of the tubular body 10 over the entire length. When the outer body 1 is flexible, the split portion 2 is in the axial direction.
(Longitudinal direction) It can be deployed only by providing it in one place, but if the outer body is made of hard synthetic resin or metal, it is necessary to cover and attach it in the middle, so it is necessary to have two or more split parts. There is. The end portion of the outer jacket body 1 is tightened by a tightening ring 5 so that the outer shell body 1 is brought into close contact with the tube body 10.

The airtight outer jacket body 1 is provided with a fluid inlet plug 3 and a pressure gauge 4. The structure of the fluid inlet plug 3 is not particularly limited as long as the structure has a good sealing property when closed. Although the illustrated example has a structure that can be opened and closed by turning a handle, a structure such as an electromagnetic valve may be used.

A watertight and airtight fastener is provided on the split portion 2 as a closing means 6 which can be opened and closed. The watertight and airtight fastener has a structure in which a protrusion 6a provided on one edge and a recess 6b provided on the other edge are forcibly fitted by a slider 6c. There are many conceivable shapes for the convex ridges and the concave ridges that mesh with each other, but there is no particular limitation as long as they have excellent sealing properties. Further, in order to improve the sealing property, an adhesive tape may be attached so as to cover the fastener.

Tube bodies 10A, 10 to be joined to the airtight outer jacket body 1
A bulged portion 1a extending between B is provided, and both end portions 1b and 1b are tubular bodies 10.
The structure is such that the diameter is reduced so as to be in close contact with the outer circumference of A and 10B. The material of the airtight outer jacket body 1 was made of flexible NBR hard rubber. The joint portion 11 between the pipe bodies does not use a separate joint in this example, the diameter of the end portion of one pipe body 10A is expanded, and the end portion of the other pipe body 10B is inserted into the expanded diameter portion. , And bonded with an adhesive.

After the repair of the leaking point or before the opening of the closing valve that has been closed after the new piping work etc., the outer periphery of the pipe body 10 is covered with the airtight outer jacket body 1 as described above. Then, after closing the watertight and airtight fastener as the closing means 6, and further tightening the vicinity of the end by the tightening ring 5, pressurized air is press-fitted by the pump 12 from the fluid inlet plug provided in the outer jacket body. Then, it was decided to compare the indicated value of the pressure gauge 4 when the fluid inlet plug 3 was closed with the indicated value of the pressure gauge after a while. When the reading of the pressure gauge decreases, it is judged that there is a leak.

FIG. 3 is a sectional view of another embodiment of the leakage inspection apparatus of the present invention. In this example, the fluid inlet plug 3 and the pressure gauge 4 are separately attached to the airtight outer jacket body 1. A two-way joint 13 is interposed between the pipes 10A and 10B. Also in this example, the outer circumferences of the pipes 10A and 10B are covered with the airtight outer jacket main body 1, and a watertight airtight fastener (not shown) as a closing means is closed. After tightening by, the pump 12 pressurizes pressurized air from the fluid inlet plug provided in the outer jacket body. After that, the value indicated by the pressure gauge 4 when the fluid inlet plug 3 is closed,
Compare with the reading of the pressure gauge after a while.

FIG. 4 is a sectional view of another embodiment of the leakage inspection apparatus of the present invention, which is used when a branch pipe is connected. A three-way joint 14 is interposed between the pipes 10A, 10B, 10C. The airtight outer jacket body 1 also has three end portions in conformity with the shape of the three-way joint, and each is sealed by a tightening ring 5. Closing means 6, 6 (watertight airtight fasteners) are provided at two locations so that one tube 10C side of the airtight outer jacket main body 1 can be opened and closed. The fluid inlet plug 3 and the pressure gauge 4 are provided as in the above embodiment. When the number of branches increases or the angle of the branches changes, the airtight outer jacket body 1 is correspondingly dealt with.
Change the shape of. Even in this case, after the pressurized fluid is introduced from the fluid inlet plug 3, the indication value of the pressure gauge 4 when it is closed is compared with the indication value of the pressure gauge after a while, and When the indicated value decreases, it is judged that there is a leak.

[0017]

According to the present invention, it is possible to easily confirm a leak at a pipe joint portion such as a water pipe or a gas pipe or a portion where leak is considered to occur. Especially, during repair before repairing the leaking point or after opening the closed valve that was closed after new piping work etc., it is possible to easily install and inspect leakage in order of connection points, so restoration work and new piping work The efficiency can be improved, and the influence of water cutoff in the vicinity can be minimized.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts in a state in which a leak inspection device of the present invention is attached to a water pipe.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a cross-sectional view of another embodiment of the leakage inspection device of the present invention.

FIG. 4 is a cross-sectional view of an example used when a branch pipe is connected.

[Explanation of symbols]

1 Overcoat body Split part 3 Fluid inlet plug 4 pressure gauge 5 Tightening ring 6 Closing means

Claims (5)

[Claims] 1. An airtight outer jacket main body having a split portion for covering the outer circumference of the tubular body, a fluid inlet plug and a pressure gauge provided on the outer shell main body, a closing means capable of opening and closing the split portion, and an end. Leakage inspection device for water pipes, etc. consisting of a tightening ring near the section. 2. The leak inspection apparatus for water pipes or the like according to claim 1, wherein the leaktight inspection device has a bulging portion extending between the pipe body and the pipe body to which the airtight outer jacket body is joined. 3. The leak inspection apparatus for water pipes according to claim 1, wherein the closing means is a watertight and airtight fastener. 4. The leak inspection device for a water pipe or the like according to claim 1, wherein the airtight outer jacket body is made of a flexible synthetic resin or rubber. 5. The leak inspection apparatus for water pipes according to claim 1, wherein the fluid inlet plug and the pressure gauge are separate bodies, or an integrated body branched from the fluid inlet plug between the airtight jacket bodies.