JP2003120888A - Repair method for existing pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair method for an existing pipe joint capable of repairing an existing pipe by providing the minimum-scale construction work and labor without necessitating a large-scale and complicated process irrespective of the existing pipe buried into the ground and the existing pipe laid on the ground. SOLUTION: In this repair method for the joint part J of the existing pipe A in which fluid F flows, a camera 5 for inspecting the inside of the pipe is moved while the fluid F flows in the existing pipe A to detect the joint part J of the existing pipe A, and filler S is poured into the joint part J while the fluid F flows to repair the joint part J of the existing pipe A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a joint portion of an existing pipe through which a fluid flows, and more specifically, a joint portion of an existing pipe is repaired while the fluid flows through the existing pipe. The present invention relates to a repair method for a joint portion of an existing pipe.

[0002]

2. Description of the Related Art A joint portion of an existing pipe such as a gas supply pipe is filled with a sealing filler, and the filler is deteriorated with the passage of time. Regardless of the location, it is subject to regular repair work. In addition, since the possibility of gas leakage is extremely high in the joint part of the existing pipe compared to other parts, if gas leakage occurs in the existing pipe, first, the presence or absence of a gas leakage point in the joint part is detected. Is efficient.

By the way, the existing pipes to be repaired are
Some are laid on the ground and some are buried underground,
With existing pipes laid on the ground, it is relatively easy to detect the joints, but with existing pipes buried underground, there is no alternative but to guess the joints using the materials used during the burial work as clues. , I usually excavated the ground and confirmed the existence of joints. Regarding the presence / absence of a gas leakage portion in the joint portion, conventionally, the presence / absence of a gas leakage portion has been detected by applying soap water to the joint portion of an existing pipe and detecting whether bubbles are generated.

[0004]

Therefore, in the conventional method, it is difficult to detect the joint portion, and particularly in the case of an existing pipe buried underground, the portion which is supposed to be the joint portion is estimated to be buried. It has to be excavated, which is a large-scale and complicated construction, and in the case of urban areas, it has become a hindrance to traffic and daily life in the section.

In addition, not only the existing gas pipes but also many other existing pipes such as water and sewage and telephone lines are arranged underground in the urban area, and moreover, they are buried so that a plurality of them intersect. Therefore, it was very difficult to excavate only the joint part of the existing pipe to be constructed.

The present invention focuses on such a conventional problem, and its object is a large-scale and complicated process regardless of an existing pipe buried underground or an existing pipe laid on the ground. An object of the present invention is to provide a method for repairing an existing pipe joint portion that can be realized without requiring any work and by providing a minimum amount of work and labor.

[0007]

[Structure] The characteristic structure of the invention of claim 1 for achieving the above-mentioned object is, as shown in FIGS. 1 to 4, a joint of an existing pipe A through which a fluid F flows. Part J
In the state where the fluid F flows in the existing pipe A, the pipe inspection camera 5 is moved to detect the joint portion J of the existing pipe A, and the fluid F flows in the existing pipe A. The filler S is drawn into the joint portion J and repaired.

The characterizing feature of the invention of claim 2 is a method for repairing a joint portion J of an existing pipe A through which a fluid F flows, as shown in FIGS. F
While moving the in-pipe inspection camera 5 to detect the joint portion J of the existing pipe A, while maintaining the state in which the fluid F flows, a predetermined region including the joint portion J of the existing pipe A. The communication of the fluid F from the upstream side to the downstream side of C is ensured, the predetermined region C is maintained in a sealed state, and the gas leakage point E is detected based on the pressure change in the predetermined region C including the joint portion J of the existing pipe A. The joint portion J of the existing pipe A including the joint portion J is detected, and the filler S is extracted into the joint portion J in a state where the fluid F flows therethrough for repair.

As shown in FIGS. 1 to 4, the feature of the invention of claim 3 is to pressurize a predetermined region C including the joint portion J, and then, based on the subsequent pressure decrease, the existing pipe including the gas leakage point E. The joint portion J of A is detected.

As mentioned above, the reference numerals have been shown for the sake of convenience in comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Operation and Effect] According to the invention of claim 1, the in-pipe inspection camera is moved to detect the joint portion of the existing pipe while the fluid is communicating with the inside of the existing pipe, and then the inside of the existing pipe is detected. The filler is drawn into the joint part of the existing pipe to repair it while the fluid is flowing through the joint part based on the imaging information supplied by the in-pipe inspection camera inserted inside the existing pipe. Can be detected visually. Therefore, in the case of a buried existing pipe, it is not necessary to perform a large-scale and complicated process of excavating each buried part of the existing pipe, which was essential for detecting the joint portion, and the fluid is fed to the existing pipe. It is possible to easily and simply detect the joint portion of the existing pipe while it is still flowing, and use it for repair work.

According to the second aspect of the present invention, similarly to the first aspect of the present invention, the joint portion of the existing pipe is detected while moving the in-pipe inspection camera in a state where the fluid communicates with the inside of the existing pipe, Then, the filler can be extracted into the joint portion of the existing pipe for repair while the fluid communicates with the inside of the existing pipe. However, in the invention according to claim 2, while ensuring the flow of fluid from the upstream side to the downstream side of the predetermined region including the joint portion of the existing pipe, the predetermined region is hermetically held, and the pressure in the predetermined region is maintained. Based on the change, it is also possible to detect the presence or absence of the gas leakage portion in the joint portion of the existing pipe and repair it.
Therefore, the operation and effect provided by the invention according to claim 1, that is, without performing the step of excavating for each buried portion required for detecting and repairing the so-called buried joint portion of the existing pipe. , The joint part of the existing pipe can be detected and repaired. Further, it is also possible to detect and repair only the joint portion of the existing pipe where the leaked portion exists.

According to the third aspect of the present invention, in order to detect a gas leakage point in a predetermined region including the joint portion of the existing pipe, the predetermined region in which the hermetically sealed state is maintained is pressurized to a predetermined pressure, and then the pressure is increased. Since the gas leak point at the joint part is detected based on the decrease, it is possible to detect the gas leak point at the joint part using a pressure supply source device such as a compressor or a pump that has been used for many purposes. It will be possible.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for repairing an existing pipe joint portion according to the present invention will be described with reference to the drawings. [First Embodiment] An existing pipe joint part repairing device G used for repairing a joint part J of an existing pipe A of the present invention will be described.

The existing pipe joint partial repair device G (hereinafter referred to as the joint partial repair device G) is remotely operated from the ground by an inspection unit D installed on the ground.

As shown in FIG. 1, the reel R installed on the ground is for winding the insertion hose I, and the filler supply hose 1 and the flexible hose 2 are enclosed in the insertion hose I. In any case, the reel R is connected to a flexible pipe arranged in the center of a main body frame, the filler supply hose 1 is connected to a filler supply unit (not shown), and The flexible hose 2 is also connected to an inflation fluid supply (not shown).

The inspection unit D, as shown in FIG. 1, is a monitor television 4 which displays an image provided by an in-pipe inspection camera 5 provided in a head portion H described later.
And a control unit 6 for adjusting and controlling the feeding amount of the insertion hose I from the reel R and controlling the entire apparatus.
And a power supply device 7 for driving the joint part repairing device G and the head part H, and the waterproof covering cylinder 3
Transmitting cable 8 and power feeding cable 9 housed inside
And are properly connected to the inspection unit D.

As shown in FIGS. 2 and 3, the joint portion repairing device G determines the positions of joint portions J which are provided inside the existing pipe A at substantially equal intervals, and then fills for sealing. The device is used for extracting and repairing the material S, and is, for example, a device used for maintenance and inspection work that is regularly performed.

As shown in FIGS. 2 and 3, the joint part repairing device G is provided with a repairing device main body 10 and an outer peripheral portion of the repairing device main body 10 and is remote from the inspection unit D. Two bag units B, which are inflated in the radial direction of the existing pipe A by operation, are provided at the front and rear ends of the existing pipe A of the repair device body 10 in the laying direction, one for each bag.

On the outer peripheral surface of the repair device main body portion 10, there is provided a fluid supply port 11 which is opened inside each of the bag portions B. The fluid supply port 11 branches inside the repair device main body 10 and is connected to the inner wall side of the bag part B, respectively, and is connected to and connected to the flexible hose 2 included in the insertion hose I. However, it is connected to an expansion fluid supply unit (not shown) arranged on the ground. The expansion fluid supplied by the expansion fluid supply unit is preferably water, but is not limited thereto.

As shown in FIG. 3, the bag portion B expands in a donut shape when supplied with an expansion fluid from the fluid supply port 11, and the inner peripheral portion of the bag portion B is surrounded by the inner diameter of the existing pipe A. The surfaces are in close contact. Therefore, the joint portion repair device G is fixedly held in a region including the joint portion J of the existing pipe A.

A filler supply ring 12 is built into the repair device main body 10 at a substantially central portion thereof. A plurality of filler supply ports 14 are provided at regular intervals on the outer diameter side of the filler supply ring 12, that is, on the main body surface side of the repair device main body 10. The filler S can be supplied to almost the entire joint portion J of the existing pipe A through the filler supply port 14. The filler supply ring 12 is
It is connected to the filler supply hose 1 which is provided in the repair device main body 10 and is included in the insertion hose I. The filler S is supplied from the filler supply unit (not shown) installed on the ground as described above.

A communication pipe 13 penetrates through the center of the repair device body 10. In this communication pipe 13, even if the joint portion repairing device G supplies the filler S to the joint portion J, that is, even if the bag portion B is expanded, the fluid F flows inside the communication pipe 13. It is configured to be flowable. Therefore, even when the filler S is drawn into the joint portion J, the live pipe state of the existing pipe A is maintained.

Bag fixing means 15 are arranged in close contact with the front and rear ends of the bag portion B. The bag portion B is fixed to the repair device main body portion 10 via the bag fixing means 15.

Next to the joint part repairing device G, a metallic head part H is provided. The insertion hose I surrounded by the protection spring 18 is connected between the joint portion repair device G and the head portion H.

The head portion H is equipped with an in-pipe inspection camera 5 and a small lamp (not shown). The transmission cable 8 and the power supply cable 9 are connected to the in-pipe inspection camera 5 and the small lamp, respectively. The transmission cable 8 and the power feeding cable 9 are included in the waterproof covering cylinder 3, and the waterproof covering cylinder 3 is housed inside the insertion hose I.

A method of repairing the existing pipe A using the joint part repair device G will be described below.

The method of repairing the joint portion of the existing pipe A in the first embodiment will be described by taking the buried existing pipe A for city gas, which is buried underground where city gas flows, as an example.

As shown in FIG. 1, in the field, first, a branch joint V is connected to an existing pipe A to be inspected and repaired according to a predetermined procedure, and the inside of the existing pipe A is connected through the branch joint V. The joint part repairing device G is inserted into.
The power supply cable 9 provided in the head portion H and
An image of the inside of the existing pipe A, which is obtained by the in-pipe inspection camera 5 connected to the monitor, is monitored by the monitor television 4 provided in the inspection unit D installed on the ground and connected to the transmission cable 8. Meanwhile, the insertion hose I is sequentially fed out from the reel R. Then, while gradually inserting the joint part repairing device G into the existing pipe A, the installation positions of the joint parts J1, J2, and J3 of the existing pipe A are detected in order from before the branch joint V. Go.

The joint portion J in the existing pipe A
The distance from 1, J2 and J3 to the branch joint V is
This can be easily obtained by recording in the inspection unit D the amount of extension of the insertion hose I that is sequentially delivered from the reel R.

The joint part repairing device G is connected to the joint part J.
As shown in FIG. 3, after being guided to 1, the expansion fluid supply section (FIG. 3) is provided to the bag section B provided in the joint section repair device G via the flexible hose 2 and the fluid supply port 11. A fluid is supplied to the inside of the bag portion B from a not shown) to inflate the bag portion B, and the joint portion repairing device G is fixed and supported in a region including the joint portion J of the existing pipe A.

After fixing and supporting the joint portion repairing device G so that the joint portion J1 is contained in a predetermined region C formed between the bag portions B, the filling material supply hose 1 and the filling material hose 1 are connected to each other. The filler S is filled into the joint portion J1 from a filler supply unit (not shown) through the filler supply port 14 provided in the filler supply ring 12 for repair.

The process of moving the joint part repairing device G to the joint part J2 which is a further repair target when the filler S is drawn into the joint part J1 and the repair is completed will be described below.

The joint part repairing device G is connected to the existing pipe J1.
When moving from the above to the existing pipe J2, the filled fluid is discharged from the bag portion B. As a result, the size of the bag portion B is slightly contracted, and a gap is created between the inner diameter portion of the existing pipe A and the outer diameter portion of the bag portion B. Therefore, the possibility of damage to the bag portion B caused by the contact with the existing pipe A during the movement is eliminated, and the movement of the joint portion repair device G inside the existing pipe A is facilitated.

Then, the joint hose I is guided from the reel R installed on the ground to the installation position of the joint J2 to be further repaired, while sequentially feeding the insertion hose I.

After moving the joint part repairing device G to the laying position of the joint part J2, the same procedure as when repairing the joint part J1 is repeated for the repair of the joint part J2.

After the repair of the joint portion J2, the joint portion J
3 and further joints are repaired by repeating the same procedure.

Second Embodiment In the above first embodiment, the joint portions J1, J2 and J3 of the existing pipe A are used.
Although all are targets of the repair process, in the second embodiment, all joint parts J are not targeted for repair, and only any joint part J that needs repair is detected and repaired. The method will be described.

The second embodiment is the same as the first embodiment in that all the existing pipe joint portions J arranged in the area or section to be constructed are to be inspected for the detection of the leaked portion. .

However, in the second embodiment,
The joint portion repair method of the first embodiment is reorganized by adding further means to the joint portion repair device G. That is, in order to detect the gas leakage point E in the joint parts J1, J2, and J3 of the existing pipe A, the predetermined region C including these joint parts J is maintained while maintaining the existing pipe A in the active pipe state. Keeping in a sealed state, the joint part J of the existing pipe A
The function of detecting and repairing the gas leakage point E in 1 is added to the joint portion repair device G in the first embodiment.

The structure of the joint part repairing device G'in the second embodiment will be described first, and then this joint part repairing device G'will be used, and then the gas leakage point E contained in the predetermined region C will be detected and repaired. The method for doing so will be described.

The joint part repairing device G'used in this embodiment has almost the same structure as the joint part repairing device G used in the first embodiment, but as shown in FIGS. 4 (a) and 4 (b). Further, a flexible supply hose 19 for supplying a fluid for pressurizing the predetermined area C is provided. The flexible supply hose 19 is included in the insertion hose I, and is bent in the existing pipe radial direction at a substantially central portion of the inside of the main body portion 10 to form an opening portion 20 provided in a central portion of the main body portion 10. Connecting. The opening 20 is provided with a check valve 21. The check valve 21 is a filling material S filled in the gas leakage point E.
Plays a role of preventing backflow into the flexible supply hose 19. The fluid supplied to the predetermined region C is a gas flowing in the existing pipe A, but may be, for example, an inert gas, but is not limited thereto.

A pressure detecting means 17 is provided in the central portion of the main body portion 10, that is, in the vicinity of the opening portion 20. The pressure detecting means 17 is provided so as to be arranged inside a region where the predetermined region C including the joint portion J1 is formed.

The head portion H has the same structure as that of the first embodiment.

In the second embodiment, the joint portion repair device G'is guided to the laying position of the joint portion J1 by the same operation as in the first embodiment, and the airtight leak test is first performed.

Similar to the first embodiment, the joint part repairing device G'is moved to a predetermined area C including the joint part J1. Then, the inflation fluid supplied by the inflation fluid supply unit is supplied to the inside of the bag portion B via the flexible hose 2. As a result, the bag portion B expands and its outer peripheral surface elastically adheres to the inner diameter portion of the existing pipe A, thereby blocking the predetermined region C while maintaining good airtightness.

After confirming that the airtightness of the predetermined area C is ensured, the pressurizing fluid supplied by the pressure supply source device is supplied to the predetermined area C through the flexible supply hose 19. Pressurize. After confirming that the pressure has been increased to a constant pressure by the control unit 6 via the pressure detection means 17, the pressure is quickly stopped, and then the predetermined region C
The change in pressure at 1 is sequentially monitored by the control unit 6 via the pressure detection means 17. When the pressure drop is detected in the predetermined area C, it is determined that the gas leakage point E exists in the joint portion J1 of the predetermined area C.

Next, the filler S is extracted into the joint portion J1 determined to have the gas leakage point E and repaired as in the first embodiment.

After the joint portion J1 is repaired, the joint portion J2 and J3 are also subjected to the airtight leakage test in the same manner as the existing pipe A by setting the predetermined region C including the arbitrary joint portion. If it is found that the gas leakage point E exists, the filler S is extracted and repaired.

[Other Embodiments] Next, another embodiment will be described. The same components as those described in the first and second embodiments or components having the same action are designated by the same reference numerals. Therefore, the description will be omitted, and only the configuration different from the first and second embodiments will be mainly described.

In the first and second embodiments, the predetermined area C
The inside of the building is pressurized, and the gas leakage point E
Although the method for detecting the presence of the gas leakage portion E has been described, conversely, it is also possible to detect the presence of the gas leakage portion E by depressurizing the inside of the predetermined region C by a predetermined operation and then increasing the pressure.

[Brief description of drawings]

FIG. 1 is an operation diagram showing a repair process of an existing pipe joint portion in the first embodiment.

FIG. 2 is a transverse cross-sectional view of one aspect of the joint partial repair device in the first embodiment.

FIG. 3 is a cross-sectional view of one aspect of the joint partial repair device in the first embodiment.

FIG. 4 is a cross-sectional view of one aspect of the joint partial repair device in the second embodiment.

[Explanation of symbols]

A Existing pipe J joint part F fluid 5 In-pipe inspection camera S filler

Claims (3)

[Claims] 1. A method of repairing a joint portion of an existing pipe through which a fluid flows, wherein an in-pipe inspection camera is moved in a state where the fluid flows inside the existing pipe to remove the joint portion of the existing pipe. Detect and
A repairing method for an existing pipe joint part, in which a filler is drawn into the joint part for repairing while the fluid is flowing therethrough. 2. A method of repairing a joint portion of an existing pipe through which a fluid flows, wherein an in-pipe inspection camera is moved in a state where the fluid flows inside the existing pipe to remove the joint portion of the existing pipe. Detecting, maintaining the predetermined region in a sealed state by ensuring the flow of fluid from the upstream side to the downstream side of the predetermined region including the joint portion of the existing pipe, in the predetermined region including the joint portion of the existing pipe A method for repairing an existing pipe joint portion, which detects the presence or absence of a gas leakage portion in the joint portion based on a pressure change, and extracts a filler into the joint portion in a state where a fluid flows to repair the gas leakage portion. 3. Pressurizing a predetermined area including the joint portion,
The method for repairing an existing pipe joint portion according to claim 2, wherein the presence or absence of a gas leakage portion in the joint portion of the existing pipe is detected based on a subsequent pressure drop.