JPH09288032A - Water sealing device for leak inspection of existing piping system - Google Patents

Abstract

(57) [PROBLEMS] To provide a leakage inspection water sealing device capable of hermetically sealing an opening of a sealing plug insertion side. A water sealing device includes a device body 1 in which a tubular member is formed in a loop shape, and a liquid 1 stored in the loop portion.
2, the one end of the device body 1 is connected to the first opening 21 of the existing pipe 2, and the sealing plug 3 connected to the insertion wire 31 from the other end side of the device body 1 is connected to the device body 1
It is configured to be passed through the inside and conveyed into the pipe 2 so that the section between the position where the sealing plug 3 is expanded and the sealing surface stored in the loop portion is an airtight section.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leak inspection provided at an opening at one end of a pipeline when inspecting an existing piping system such as a gas pipe or a water pipe for leakage by an airtight method. Water sealing device

[0002]

2. Description of the Related Art As a method for inspecting whether or not a leak has occurred in an existing piping system, an airtight inspection means is known. As a prior art of this airtight inspection means, for example, as described in Japanese Patent Laid-Open No. 63-120237, a sealing plug capable of expanding and contracting is inserted into a pipe through an opening at one end of a pipe. , After moving this to an appropriate position, it is expanded to close the inside of the pipe to form a sealed space between the sealing plug and the other end opening of the pipeline, and whether there is a change in pressure in the sealed space. Is detected to detect whether or not leakage has occurred in the pipeline.

[0003]

By the way, in the case of the above-mentioned prior art, when the sealing plug is inserted into the pipe through the opening at one end of the conduit, the insertion wire of the sealing plug and the like obstructs the sealing of the airtight section. It can only be provided on the inner side of the stopper, that is, between the sealing stopper and the opening on the other end side of the conduit. for that reason,
Since there is a limit to the insertability of the insertion wire, there is a problem in that the inspection section of the pipe cannot be lengthened. Further, since the airtightness inspection can be performed only in one direction, there is a problem that the inspection time becomes long.

The present invention has been proposed to address the above-mentioned problems, and an object of the present invention is to provide a leakage inspection water sealing device capable of hermetically sealing an opening on the sealing plug insertion side.

[0005]

In order to achieve the above-mentioned object, the water sealing device for leakage inspection of an existing piping system according to the present invention comprises:
A water sealing device used for leak inspection of an existing pipe system, in which a predetermined section of a pipe system is sealed and a pressure change after pressurizing the section is detected to inspect a leak in a pipeline. The water sealing device is composed of a device body in which a tubular member is formed in a loop shape, and a sealing material stored in the loop portion, and one end of the device body is connected to an opening of the existing pipe, From the other end of the main body, the sealing plug connected to the insertion wire is passed through the inside of the main body of the device and conveyed into the pipe.
The section between the expanded position of the sealing plug and the seal surface stored in the loop portion is an airtight section.

Further, the apparatus body is characterized in that a transparent plastic tube is internally provided with a coil spring.

Further, the above-mentioned sealing material is characterized by being a liquid having an anticorrosive effect.

Furthermore, the apparatus body is characterized in that a stand member for horizontally installing the body is provided.

[0009]

With the above structure, one end of the main body of the water sealing device is hermetically connected to the one end opening of the pipe to be inspected. Then, from the other end of the device body, a sealing plug connected to the insertion wire is passed through the inside of the device body formed in a loop shape to introduce the sealing plug into the conduit. Then, after expanding the sealing plug at a required position in the pipe, a section between the sealing plug and the one end opening portion of the pipeline is pressurized for an airtight test. On this occasion,
Since the sealing material such as liquid is stored in the loop portion of the apparatus body, the liquid surface of the sealing material serves as the sealing surface. Therefore, the airtightness can be properly maintained even though the insertion wire or the like is interposed.

In the leakage inspection water sealing device according to the second aspect of the present invention, since the device main body has a transparent plastic tube in which a coil spring is incorporated, a sealing material such as liquid stored in the loop portion The situation can be easily confirmed from the outside, and since it is lightweight, it can be easily carried, and further, when the sealing plug is inserted, the sealing plug can be prevented from coming into contact with the inner peripheral surface of the main body and being damaged.

Furthermore, in the leakage inspection water sealing device according to the third aspect, since the sealing material is a liquid having a rust preventive effect, the sealing plug and the insertion wire will not rust even if immersed in the liquid.

Furthermore, in the water seal device for leakage inspection according to the fourth aspect, since the apparatus main body is provided with the stand member for horizontally installing the main body, the water seal device can be stably installed at the construction site. become.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a leakage inspection water sealing device of the present invention. In the drawing, reference numeral 1 is a water sealing device body, and the water sealing device body 1 is formed by forming a transparent soft plastic tube having a required inner diameter in a loop shape. In addition, the coil spring 11 is internally provided. Therefore, the water sealing device body 1 is relatively lightweight and easy to handle, and has the elastic force and strength to some extent because the coil spring 11 is incorporated therein.

A liquid 12 having a rust preventive effect is stored as a sealing material in the lower half of the loop portion (arc) of the apparatus body 1. The liquid may be a liquid containing red lead, zinc chromate, barium chromate, or the like as a rust preventive pigment, or a liquid such as oil. Since the liquid 12 is stored in the loop portion, the liquid surface 12a and the liquid surface 1 are provided in the loop portion.
2b is formed.

Further, a connecting member 13 such as a cam lock for airtightly connecting to the one end opening of the pipe to be inspected is provided on one end side of the apparatus body. Further, the apparatus body 1 is provided with a stand member 1 for horizontally installing the body 1.
4 is provided, and one end of the stand member 14 is connected to the intersecting portion of the loop to stably install the apparatus main body 1.

Next, the operation of the leak inspection water sealing device configured as described above will be described with reference to FIG. In FIG. 2, reference numeral 2 is an existing pipe to be inspected. The existing pipe 2
A pipe joint such as an elbow 23 is provided on the way, and a first opening 21 is opened at one end of the pipe and a second opening 22 is opened at the other end.

A pressure pump 24 and a pressure gauge 25 are provided near the first opening 21 so as to be in communication with the pipe 2. Further, the second opening 22
A pressure pump 24 and a pressure gauge 25 are also provided in the vicinity so as to be in communication with the pipe 2 as described above.

The existing pipe 2 constructed as described above is inspected for leaks. First,
The second opening 22 is closed with a plug or the like, and the first opening 2
The watertight device body 1
To communicate with the existing pipe 2. Next, the sealing plug 3 connected to the insertion wire 31 is introduced into the device body 1 from the open end of the device body in a closed state, and is passed through the inside of the device body 1 formed in a loop shape to seal the device. The stopper 3 is introduced into the conduit. At this time, since the apparatus body 1 is formed of a soft plastic tube, it is possible to prevent the sealing plug 3 from coming into contact with the inner peripheral surface of the body 1 and being damaged when the sealing plug 3 is inserted. Further, since the liquid 12 has an anticorrosive effect,
Even if it is immersed in the sealing plug 3 or the insertion wire 31, it does not rust.

Then, the sealing plug 3 is transported to a substantially intermediate position of the existing pipe 2, and after the transportation, the sealing plug 3 is expanded by fluid pressure or the like to cut the existing pipe 2 into two parts. And the first
The pressure pumps 24 on the opening 21 side and the second opening 22 side are driven to apply pressure to the inside of the pipe. At this time, on the side of the first opening portion 21, since the liquid 12 and the insertion wire 31 are in close contact with each other despite the insertion wire 31 being interposed, the sealing plug 3 and the water sealing device 1, that is, the liquid surface 12a.
The section with and becomes the airtight section. On the side of the second opening 22, the section between the sealing plug 3 and the second opening 22 is an airtight section. Then, the pressure gauges 25 provided on the first opening 21 side and the second opening 22 side check the pressure fluctuations in both airtight sections.

If a pressure change can be confirmed in the pipe on the side of the first opening 21 side, it can be determined that there is a leak location in the pipe on the side of the first opening 21 side. Therefore, the airtightness test is performed by temporarily shrinking the sealing plug 3, pulling back the required amount toward the first opening 21 side, and expanding again. Then, pull back the sealing plug 3 to the position where the pressure fluctuation disappears,
Identify the leak location. In addition, the second opening 2
When it is determined that there is a leak on the 2nd side, and especially when the pipe in the inspection section is long, the water seal device 1 is connected to the second opening 22 side, and the sealing plug 3 is connected to the second pipe of the existing pipe 2. Opening 2
2 is inserted into the pipe 2 and the sealing plug 3 is conveyed to a substantially central position of the above-mentioned existing pipe 2 and then pulled back to the second opening 22 side by a required amount and expanded to perform an airtight test, Identify the leak location.

As described above, since the existing pipe 2 is divided into two and the airtightness test can be performed on both sides at the same time, the inspection time can be greatly shortened and the pipe to be inspected can be lengthened. The number of working vertical shafts for inspection can be reduced, and the labor for vertical shaft production and the labor for cutting and restoring pipes can be significantly reduced.

[0022]

Since the present invention is configured as described above,
The following effects are obtained. (1) Since the sealing material such as liquid is stored in the loop portion of the main body of the device, the liquid level of the sealing material is properly chamfered even though the sealing surface is formed and the insertion wire or the like is interposed. Airtightness can be maintained. Therefore, the airtightness test can be simultaneously performed on the pipes on both sides with the sealing plug as a boundary.

(2) Since the main body of the apparatus is a transparent plastic tube with a coil spring inside, the condition of the sealing material such as liquid stored in the loop portion can be easily confirmed from the outside. Since it is lightweight, it can be easily carried, and further, when the sealing plug is inserted, the sealing plug can be prevented from coming into contact with the inner peripheral surface of the main body and being damaged.

(3) Since the sealing material is a liquid having a rust preventive effect, it does not rust even if the sealing plug and the insertion wire are immersed in the liquid.

(4) Since the apparatus main body is provided with the stand member for horizontally installing the main body, the water sealing device can be stably installed at the construction site.

[Brief description of drawings]

FIG. 1 is an external view of a leakage inspection water sealing device according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram of the leakage inspection water sealing device of the embodiment.

[Explanation of Codes] 1 water sealing device body 11 coil spring 12 liquid 12a liquid surface 12b liquid surface 13 cam lock 14 stand material 2 existing pipe 21 first opening 22 second opening 23 elbow 24 pressurizing pump 25 pressure gauge 3 sealing Stopper 31 Insertion wire

Front Page Continuation (72) Inventor Koichi Wakui 1-15-15 Kamiujo, Kita-ku, Tokyo (72) Inventor Yasuhiro Ozawa 204-9 Oizumiji-cho, Kasugai-shi, Aichi (72) Inventor Masao Kimura Inuyama-shi, Aichi 26, Yokomachi (72) Inventor Keijiro Hori 7-2-5-704 Minamikasai, Edogawa-ku, Tokyo

Claims (4)

[Claims] 1. A water sealing device used for leakage inspection of an existing piping system, in which a predetermined section of the piping system is sealed and a change in pressure after pressurizing the section is detected to inspect a pipeline for leakage. The water sealing device is composed of a device body formed by forming a tubular member in a loop shape, and a sealing material stored in the loop portion, and one end of the device body is provided in an opening of the existing pipe. Connect
The sealing plug connected to the insertion wire from the other end side of the device body is conveyed through the inside of the device body into the pipe, and the position where the sealing plug is expanded and the sealing surface stored in the loop portion A water sealing device for leak inspection of an existing piping system, characterized in that the section is an airtight section. 2. A water sealing device for leakage inspection of an existing piping system according to claim 1, wherein the device body is a transparent plastic tube in which a coil spring is incorporated. 3. The water sealing device for leak inspection of an existing piping system according to claim 1, wherein the sealing material is a liquid having a rust preventive effect. 4. The water sealing device for leakage inspection of an existing piping system according to claim 1, wherein the device body is provided with a stand member for horizontally installing the body.