JPS6168174A - Repairing method of city gas conduit - Google Patents

Abstract

PURPOSE:To perform the titled repairing construction easily and quickly in low cost by sending a freely expandable and contractible pack from a branched pipe, expanding it to interrupt a main pipe and feeding a sealing agent or the like by gas from the branched pipe. CONSTITUTION:A freely expandable, contractible and drawable pack 7 is sent from an above-ground part 4a of a branched pipe 4 and expanded to interrupt a main pipe 1. A sealing agent or a lining agent is fed by the pressurized city gas from the above-ground parts 2a, 3a of branched pipes 2, 3. By this method, the repair is performed easily and quickly without digging up the main pipe or forming an aperture.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a system for connecting a main pipe that is buried or hidden by a structure, and a plurality of branch pipes connected to the main pipe in a gas pipeline in a city gas pipeline. , relates to a method of repairing the interior thereof with a sealing or lining agent supplied by pressurized gas.

[Prior art]

Conventionally, as shown in Fig. 6, both sides of the area to be repaired (11) of the main pipe il+ are excavated and opened, and the above-ground part (1 m) of the branch pipe (21, +31) to be repaired is opened.
8m), close one opening of the main pipe (1) with a lid θ, and apply sealant or lining agent from the other opening of the main pipe (1) or from the openings of branch pipes +21 and +31-, respectively. It was supplied with pressurized gas from the blower @H (
(Unable to provide references).

[Problem that the invention seeks to solve]

However, in any of the conventional methods, a lot of work time is required to excavate and open the main pipe, and a large amount of expense is required for the excavation work and the disposal of the excavated earth and sand, and there is room for improvement in terms of both workability and construction cost. was there.

An object of the present invention is to enable repair of a buried or hidden main pipe and a plurality of branch pipes connected thereto by extremely rational means without requiring any digging or opening in the main pipe. It is in the point of doing.

[Means to solve the problem]

The characteristic means of the present invention is to send a bag which can be inflated and deflated from the ground and can be freely pulled out from the ground part of at least seven branch pipes into the main pipe, inflate it, and block the main pipe with the inflated bag. Then, pressurized city gas from the other above-ground section is applied with a sealant or The purpose is to supply a lining agent and send the sealing agent or lining agent from one of the upstream and downstream branch pipes to the other through the main pipe, and its effects are as follows.

[For production]

A sealing agent or lining agent is sent from the above-ground part of one branch pipe to the above-ground part of the other branch pipe using pressurized city gas that is circulated across both branch pipes and the main pipe, and seals the main pipe and multiple branch pipes. In addition, the main pipe is blocked by a bag introduced from the above-ground portion of the branch pipe to prevent the sealant or lining agent from flowing to unnecessary locations within the main pipe. After completing the sealing process or lining process for the main pipe and the branch pipe, the bag can be deflated and taken out from the branch pipe, and city gas supply can be resumed.

〔Effect of the invention〕

As a result, the above-ground portion of the branch pipe is effectively utilized for blocking the main pipe with the bag, sealing and lining the main pipe and branch pipe, and removing the bag, all without the need to dig out the main pipe or form an opening. The construction work can now be carried out easily, quickly and at low cost.

In addition, there is no need to prepare pressurized gas for circulating city gas in the main pipe and branch pipes, which further simplifies construction work and reduces costs.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, underground city gas supply main pipe (1)
/ connected upstream to the repair target part (1a) of
A wooden branch pipe (2) and two branch pipes connected to the downstream side (31, +41 above-ground parts (2a), (3a).

An opening is formed in (4a). That is, for example, an opening is formed by removing the customer gas meter and meter cock in the meter standpipe as the branch pipe (21, +311 (41).

Next, as shown in Figure 2, the hose (5) can be freely inflated by the pressurized fluid supply device (6) connected to the hose (5)
A bag (7) that can be freely deflated by discharging fluid from the bag (6) and can be freely drawn out using a hose (6);
From the above-ground part (4a) of the most downstream branch pipe (4) to the main pipe (1
) is fed under pressure by pressurized city gas supplied from the downstream branch pipe (3) through a pipe (9) with a blower (8),
Inflated with pressurized fluid from the device (6), the inflated bag (7) blocks the main pipe (1).

Next, as shown in Fig. 8, a blower (8) supplies pressurized city gas from the downstream branch pipe (3) to the upstream branch pipe (2).
) with a pipe (9), connect a tank +101 for supplying a sealant or lining agent to the pipe (9) on the discharge side of the blower (8), and connect the pipe (9) on the suction side of the blower (8). A recovery device (Ill) is installed to separate and recover the sealant and lining agent from the gas.

Next, if! [81] While supplying pressurized city gas to the upstream branch pipe (3), the sealing agent or lining agent from the tank (10) is transferred to the upstream branch pipe (2) and the main pipe (1) in the form of foam or by pneumatic conveyance. ), downstream branch pipe (3)
Send in the order of main pipe (1) and both branch pipes +21, +3
Perform the + sea I cleaning process or lining process.

Also, once the sealing or lining process is completed, remove the pipe (9) from the branch pipes +2) and +31 and remove it from the bag (
7) and pull it out with the hose (6), reconnect the three branch pipes +2+, +31, and +41, and restart the city gas supply.

[Another example]

Next, another embodiment will be described.

The branch pipe (4) through which the bag (7) is inserted and removed may be one upstream of the upstream branch pipe (2), and the branch pipe (2+, (31) upstream and downstream of the branch pipe (2+) to be repaired). Both may be used, and as shown in FIG. 4, the downstream branch pipe (3) to be repaired may also be used, in short, 7
It is sufficient to inflate one or more bags (7) at a position that does not interfere with the repair of the main pipe (1) and branch pipes (21, (31).

Bag (7) can be selected appropriately in terms of material, shape, etc. Bag (71f, branch pipe +3+, (
In order to insert or take out the bag (7), an appropriate jig can be used by connecting it to the branch pipe (4).Furthermore, in order to forcefully feed the bag (7), various ventilation equipment can be used. can be used, and a flexible pusher can be used to secure the bag (7
) may be sent. Various gas or chemical supply equipment can be used to inflate the bag (7), and rigging for this purpose may be connected to the bag (7) to extract the force.

The coating agent or lining agent may be supplied from the downstream branch pipe (3), and as shown in FIG.
3) may be supplied to a plurality of branch pipes (2), or may be supplied to a main pipe H from a plurality of branch pipes (2) or (3). Whether to supply and collect can be changed as appropriate depending on the situation.
In addition, various ventilation equipment can be used to supply pressurized city gas from one of the downstream and upstream branch pipes t21 and (3+) to the other.

As the sealant, for example, various emulsion latexes and other suitable materials can be used, and as the lining agent, for example, epoxy resins, urethane resins, and other suitable materials can be used.

The main pipe fl) may be hidden in the structure, and in that case, the externally exposed parts of the branch pipes (2+, +31, (41) are connected to the above-ground parts (2a), (3a), (4
It is called a).

[Brief explanation of drawings]

1 to 8 are conceptual diagrams illustrating the procedure of the method of the present invention. 4 and 6 are conceptual diagrams showing different embodiments of the method of the present invention. FIG. 6 is a conceptual diagram of a conventional example. (1)...Superintendent, (21,, (31, fil・
...Branch pipe, (2a). (aa), (4a)... Above ground part of branch pipe, (
7)...Bag.

Claims (1)

[Claims] A bag (7) configured to be able to be inflated and deflated and withdrawn from the ground is inserted into at least one branch pipe (3) within the main pipe (1).
), (4) from the above-ground parts (3a), (4a) and inflate it, the inflated bag (7) blocks the main pipe (1), and the bag (7) of the main pipe (1) Upstream branch pipe (2) connected to the upstream or downstream part of
and supplying a sealing agent or lining agent to one of the aboveground sections (2a) or (3a) of the downstream branch pipe (3) by pressurized city gas from the other aboveground section (3a) or (2a). A method for repairing a city gas pipe, in which a sealing agent or a lining agent is sent from one of the upstream and downstream branch pipes (2), (3) to the other through the main pipe (1).