JPH09210834A - Method and apparatus for inspection of airtightness of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To confirm the airtightness of the joint part of a conduit to a lining pipe which is installed along its inner circumferential face. SOLUTION: A pipe body 3 which is constituted in such a way that a lining pipe 2 is installed along the inner circumferential face of a conduit 1 and a joint member 6, for branching, which connects a branch pipe with reference to the pipe body so as to communicate freely in a state that its airtightness is maintained are attached in a state that a branch through part 5 at the pipe body is covered. Then, a through hole H1 in the lining pipe 2 at the branch through part 5 is closed, and a gas G for inspection is pressed into an inside empty part V at the joint member 6 so as to be pressurized to a prescribed intial pressure value. After that, the pressure value of the inside emoty part V is measured. When the measured pressure value is decreased from the initial pressure value, it is judged that a leak from the joint part 4 of the conduit 1 to the lining pipe 2 exists.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides airtightness of a joint portion between a conduit and a lining pipe in a branch penetrating portion of a pipe body formed by installing a lining pipe along an inner peripheral surface of the conduit. The present invention relates to a pipe airtightness inspection method and a pipe airtightness inspection device.

[0002]

2. Description of the Related Art As a pipe rehabilitation method for an existing old pipe, for example, a synthetic resin pipe is formed in the inner space of the pipe.
Although there is a method of inserting and lining it by inflating it along the inner peripheral surface of the conduit and lining it, when the adhesion between the conduit and the lining pipe is poor, the corrosion of the conduit progresses and cracks, for example. When a hole or a hole is formed, gas in the conduit may leak through the joint between the conduit and the lining pipe at the branch penetrating portion. We are dealing with it by sealing it. Heretofore, there has been neither such a pipe airtightness inspection method nor a pipe airtightness inspection device.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a pipe airtightness inspection technique capable of confirming the airtightness of a joint between a pipe and a lining pipe along the inner peripheral surface thereof. It is in.

[0004]

[Means for Solving the Problems]

[Structure] The characteristic means of the present invention according to claim 1 is a state in which a pipe body constructed by installing a lining pipe along an inner peripheral surface of a pipe and a branch pipe for the pipe body are kept airtight. A joint member for branching, which can be freely connected and communicated with, is attached in a state of covering the branch penetrating portion of the pipe body, and the through hole of the lining pipe in the branch penetrating portion is closed, and an inspection is performed in the inner space of the joint member. After pressurizing a gas for pressurization to a predetermined initial pressure value, the pressure value in the inner space is measured, and if the measured pressure value is lower than the initial pressure value, the conduit and the lining pipe are combined. I am in the process of judging that there is a leak from the department.

According to a second aspect of the present invention, the pipe body and the branch pipe are hermetically sealed at the branch penetrating portion of the pipe body having the lining pipe installed along the inner peripheral surface of the pipe. A branch joint member that can be freely connected and connected in a maintained state is provided, a closing member that can close the through hole of the lining pipe is provided, and a press-fitting device that can press-fit an inspection gas into the inner space of the joint member is provided, A pressure measuring device capable of freely measuring the pressure of the inspection gas in the inner space is provided.

[Operation and Effect] According to the characteristic means of the present invention according to claim 1, the branch joint member is attached in a state of covering the branch penetrating portion of the pipe body, and the lining at the branch penetrating portion. After closing the through hole of the pipe, pressurizing the inspection gas into the inner space of the joint member to pressurize it to a predetermined initial pressure value, the pressure value of the inner space is measured, and the measured pressure value is If it is lower than the initial pressure value, it is determined that there is a leak from the joint between the conduit and the lining pipe,
It is possible to reliably inspect the gas leakage from the mating portion. That is, since the inspection gas press-fitted into the joint member is originally supposed to be sealed in the inner space of the joint member, it should maintain a predetermined pressure value. If the adhesion with the lining pipe is poor,
From that portion, it enters the joint portion and leaks along the pipe body, and the gas pressure value in the joint member decreases. Therefore, by observing this decrease in pressure value, it is possible to obtain the inspection result that the gas is leaked. Also,
As described above, by being able to recognize the gas leakage from the mating portion, it is possible to take an appropriate countermeasure against the branch pipe mounting work of the pipe body, and it is possible to carry out a more reliable branch pipe mounting work. . Furthermore, the branch joint member can also be used as one component of the inspection tool, and the inspection tool cost can be reduced. Once the joint member is attached to the branch penetrating portion of the pipe body, it is necessary to remove it after the inspection. Instead, the branch pipe connecting work can be carried out as it is, and the workability of the inspection work and the branch pipe mounting work can be improved together.

According to the characterizing feature of the present invention according to claim 2, the pipe body and the branch pipe are hermetically sealed at the branch penetrating portion of the pipe body formed by installing the lining pipe along the inner peripheral surface of the pipe. A branching joint member that can be freely connected and connected in a state of maintaining the property, a closing member that can close the through hole of the lining pipe is provided, and a press-fitting device that can press-fit an inspection gas into the inner space of the joint member is provided. Provided, since a pressure measuring device capable of freely measuring the pressure of the inspection gas in the inner space is provided, the joint member is installed in the branch penetrating portion of the pipe body, and the through hole of the lining pipe is formed by the closing member. After closing and after injecting the inspection gas into the inner space of the joint member with the press-fitting device, the gas pressure can be measured by the pressure measuring device, and the above-mentioned pipe airtightness inspection method can be carried out more efficiently. Check the gas leakage from the mating section. It is possible to test to. Also, since it is possible to set on the branch penetrating portion and recognize the presence or absence of gas leakage from the mating portion on the spot, it is highly maneuverable, and immediate measures for gas leakage should be taken. Is possible.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows a branching portion of a pipe body 3 in which a lining pipe 2 is installed in an existing old conduit pipe 1 for pipe rehabilitation. The conduit 1 is a metal gas conduit, and it is predicted that corrosion in the ground will progress, and thus,
As described above, the pipe has been rehabilitated. For the lining pipe 2, after inserting a synthetic resin tube into the conduit 1, the tube is inserted into the lining pipe 2.
It is formed by bulging and deforming along the inner peripheral surface of the. Further, the lining pipe 2 and the conduit 1 are adhered to each other at a joint portion 4 between them. The branching part of the pipe body 3 is constituted by a branch penetrating part 5 formed on the side surface of the pipe body. The branch penetrating portion 5 has a through hole H that penetrates the conduit 1 and the lining pipe 2. The mating portion 4 is exposed on the inner peripheral surface of the through hole H.

In the airtightness inspection of the pipe in this embodiment, the branch pipe 1 is used.
When attaching a, the presence or absence of gas leakage at the branch penetrating portion 5 (particularly, the mating portion 4) is inspected, and the specific method is as follows. [1] As shown in FIG. 1 (a), a branch joint member 6 which is freely connectable and communicatively connectable to the pipe body 3 and the branch pipe 1a in a state where airtightness is maintained is provided in a state of covering the branch penetrating portion 5. Install. [2] As shown in FIG. 1B, the through hole H1 of the lining pipe 2 in the branch penetrating portion 5 is provided with a closing member 7 to be described later.
The test gas G is press-fitted into the inner space V of the joint member 6 by the press-fitting device 8 to pressurize it to a predetermined initial pressure value. [3] Then, the pressure value of the inner space V is measured by the pressure measuring device 9, and if the measured pressure value is not different from the initial pressure value, it is determined that there is no leak in the mating unit 4, If it is lower than the initial pressure value, it is determined that there is a leak from the mating unit 4.

Next, the airtightness inspection apparatus S used for the airtightness inspection of this tube will be described. The airtightness inspection apparatus S is provided with a branching joint member 6 which can freely connect and connect the pipe body 3 and the branch pipe 1a in the branch penetration portion 5 in a state where airtightness is maintained, and the through hole H1 of the lining pipe 2 is provided. A closing member 7 that can be closed is provided, a press-fitting device 8 that can press-fit an inspection gas G into the inner space V of the joint member 6 is provided, and the pressure of the inspection gas G in the inner space V can be measured freely. A measuring device 9 is provided and configured. As the inspection gas G, air is used in this embodiment.

The joint member 6 is composed of two split joints 6a and 6b in the radial direction of the tubular body 3 (see FIG. 4), and the split through joint 5 is covered with both split joints. By arranging and flange joining, it is possible to closely attach to the outer peripheral surface of the tubular body 3 and attach it in an airtight state. Further, a branch pipe attachment portion 10 to which the branch pipe 1a can be attached is provided on one of the split joints 6a. Then, in conjunction with the airtightness inspection, the press-fitting device 8 is attached to the branch pipe attachment portion 10 in a hermetically sealed state.

The press-fitting device 8 puts a compressor for press-fitting the inspection gas G into the inner space V of the joint member 6 and the tip of the compressor discharge pipe 8a in an airtight state in the branch pipe mounting portion 10. A mounting plate 8b for mounting is provided. Although not shown in the figure, the discharge pipe 8a is provided with a valve capable of opening and closing the discharge flow passage, and the state of sending the inspection gas G to the inner space V is adjusted by this valve operation. can do. In the mounting plate 8b, a first continuous hole 11 that connects the discharge pipe 8a and the inner space V, and a gas pressure detection pipe 9a of the pressure measuring device 9 and the inner space V are connected. The second communication hole 12 is provided, and the gas pressure of the inner space V pressurized by the compressor can be measured by the pressure measuring device 9.

Next, the closing member 7 will be described.
The closing member 7 is closed from above so that the seal rubber ring is in close contact with the periphery of the through hole H1 of the lining pipe 2 so as to close the through hole H1. As shown in FIG. 2, the first cylindrical member 13 having a bottomed cylindrical shape (made of metal) and the male screw portion 13c formed at the upper end of the first cylindrical member 13 can be screwed together and A nut member 14 (made of metal) that can be locked to the peripheral edge portion of the through hole of the joint member 6, and is interposed between the first cylindrical member 13 and the nut member 14 while being fitted onto the first cylindrical member 13. The receiving member 15, the seal rubber ring 16, the diameter expansion inducing member 17, and the spacer second cylindrical member 18 which are provided are provided. The first tubular member 13 has a flange portion 13a formed on the outer edge of the lower end portion.
The receiving member 15 is slidably mounted on the surface of a (sliding along with rotation around the cylinder axis). In addition, the first tubular member 13
On the inner peripheral portion of the upper end portion, a fitted portion 13b for fitting an operating portion of a tool such as a hexagon wrench when the branch penetrating portion 5 is opened and closed by the closing member 7 is formed. is there. The receiving member 15 is formed in a ring shape, the lower surface thereof is formed in a flat shape along the flange portion 13a, and the upper surface thereof is formed in a curved surface shape along the inner peripheral surface of the lining pipe 2. . The seal rubber ring 16 is
With the lower surface in contact with the receiving member 15, the guide slope portion 17a of the diameter expanding guide member 17 enters the inner peripheral side to expand the upper surface side, and the upper surface portion of the inner peripheral surface of the lining pipe 2 is expanded. The through hole H1 can be closed by being pressed against the (peripheral portion of the through hole H1). The diameter expansion guide member 17 is formed with a guide slope portion 17a on the outer periphery of the intermediate part for expanding the diameter of the seal rubber ring 16, and the nut member 1 is operated by screwing the first tubular member 13.
4 and the flange portion 13a come close to each other, the dimensions are set so that the guide slope portion 17a enters the inner space of the seal rubber ring 16. The spacer second tubular member 18 transmits the relative proximity force between the nut member 14 and the flange portion 13a to the diameter expansion guiding member 17 and secures the space V1 where the mating portion 4 is exposed. . The nut member 14 has a female screw portion 14 which is screwed to the male screw portion 13c of the first tubular member 13 on the inner peripheral portion thereof.
a is formed, and the through hole H of the joint member 6 is formed in the outer peripheral portion.
The countersunk portion 6c formed at the peripheral edge is provided with a locking brim-shaped portion 14b that can be locked, and the lower end portion is in contact with the spacer second cylindrical member 18 and the flange portion 13 and The contact portion 14c for transmitting the relative proximity force of is formed. In addition, the inner void portion V of the joint member 6 whose pressure is increased by the press-fitting device 8 and the space V1 are provided in a part of the locking collar-shaped portion 14b.
A notch 14d is formed to connect the inspection gas G to the mating portion 4 exposed in the space V1.

Therefore, the closing member 7 is inserted into the through hole H of the branch penetrating portion 5 in the state shown in FIG. 1A (the state where the seal rubber ring 16 is not expanded), and the counterbore portion 6c is formed. After the nut member 14 is locked to the first tubular member 13, the first tubular member 13 is screwed upward to
As shown in (b), the seal rubber ring 16 expands in diameter and is pressed against the inner peripheral surface of the lining pipe 2 to close the through hole H.

If an appropriate airtightness can be confirmed by an airtightness test, as shown in FIG. 3, the first tubular member 13 is replaced by a tubular member 19 having a bottomless shape, and the second tubular member is replaced by a second tubular member. By attaching the seal rubber ring 20 for sealing the mating portion instead of the tubular member 18, it is possible to configure a pipe branch portion having high airtightness.

[Another Embodiment] Another embodiment will be described below.

<1> The conduit is not limited to the gas conduit described in the above embodiment, but can be a conduit through which various fluids can freely flow. <2> The pipe airtightness inspection method of the present invention is not limited to being performed by using the inspection device described in the above embodiment, and can be performed by using a jig that replaces it.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the procedure of an airtight inspection of a pipe.

FIG. 2 is an exploded perspective view showing a closing member.

FIG. 3 is a sectional view showing a pipe branch portion.

FIG. 4 is a partially cutaway perspective view showing a branch penetrating portion.

[Explanation of symbols]

 1 conduit 1a branch pipe 2 lining pipe 3 tubular body 4 mating part 5 branch penetrating part 6 joint member 7 closing member 8 press fitting device 9 pressure measuring device G inspection gas H1 through hole V inner space

Claims (2)

[Claims] 1. The conduit (1) and a lining in a branch penetrating portion (5) of a tubular body (3) constructed by installing a lining pipe (2) along an inner peripheral surface of the conduit (1). A pipe airtightness checking method for confirming airtightness of a mating portion (4) with a pipe (2), wherein the pipe body (3) and the branch pipe (1a) can be connected and connected to each other while maintaining airtightness. A branching joint member (6) is attached to cover the branch penetrating part (5), and the through hole (H1) of the lining pipe (2) in the branch penetrating part (5) is closed. Inner space (V) of joint member (6)
After pressurizing the inspection gas (G) to pressurize to a predetermined initial pressure value, the pressure value of the inner space (V) is measured, and if the measured pressure value is lower than the initial pressure value, A method for inspecting air tightness of a pipe, which determines that there is a leak from the mating portion (4). 2. A branch pipe (3) and a branch pipe in a branch penetrating portion (5) of a pipe body (3) which is constructed by installing a lining pipe (2) along an inner peripheral surface of the pipe (1). A branch joint member (6) that can be freely connected and connected to (1a) while maintaining airtightness is provided, and a through hole (H) of the lining pipe (2) is provided.
1) is provided with a closing member (7) that can be closed, and a press-fitting device (8) that can press-fit the inspection gas (G) into the inner space (V) of the joint member (6) is provided. A pipe airtightness inspection device provided with a pressure measuring device (9) capable of freely measuring the pressure of the inspection gas (G) of (V).