JPS6168175A - Repairing method of city gas conduit - Google Patents

Abstract

PURPOSE:To perform the titled repairing construction easily and quickly by sending the freely expandable and condactible plural packs to a main pipe from a branched pipe, expanding it to interrupt the main pipe, feeding the gas contg. medicines from one hand and discharging it from the other hand. CONSTITUTION:Two or more pieces of freely expandable, contractible and drawable packs 8a, 8b are sent from the above-ground parts 2a, 5a of the branched pipes 2, 5 and expanded to interrupt a main pipe 1 in two or more positions. A sealing agent or a lining agent is fed by the pressurized gas from the above-ground parts 3a, 4a of the branched pipes 3, 4 and the gas is discharged from the other hand. By this method, the repair is performed easily and quickly without digging out the main pipe and forming an aperture.

Description

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

[Prior art]

Conventionally, as shown in Fig. 4, parts of the main pipe (1) on both sides of the area to be repaired (1&) are excavated and opened, and the above-ground parts (3) and (4) of the branch pipes (3) and (4) to be repaired are 31L
).

(4a) is opened, and one opening of the main pipe (1) is closed with a lid q.
4, and the sealant or lining agent was supplied from the other opening of the main pipe (1) or from the openings of the branch pipes (3) and (4) using pressurized gas from a blower. (Unable to show 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. The point is to make it.

[Means to solve the problem]

The characteristic means of the present invention is to send at least two bags which can be inflated and deflated from the ground and can be freely drawn out from the ground to be inflated by sending them into the main pipe from above ground parts of at least two branch pipes. The above-mentioned main pipe is blocked at at least two places with a bag, and the above-ground portion of one of the upstream branch pipe and the downstream branch pipe connected between the adjacent bags of the main pipe is sealed with pressurized gas. passing through the main pipe from one of the upstream and downstream branch pipes to the other while supplying the agent or lining agent and discharging gas from the above-ground portion of the other of the upstream and downstream branch pipes; The purpose is to deliver a sealing agent or lining agent, and its effects are as follows.

[Function] In other words, 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 gas, and the main pipe and multiple branch pipes are sealed or lined. In addition, bags introduced from the above-ground part of the branch pipe can be used to block the main pipe at two locations, preventing the sealant or lining agent from flowing into unnecessary locations within the main pipe, and eliminating the need for city gas to flow from the main pipe. This prevents it from leaking to other countries. Once the sealing or lining treatment for the main pipe and the branch pipe is completed, 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, for example, compared to connecting branch pipes with blower pipes in order to circulate and flow city gas in the main pipe and branch pipes, piping work is simplified even if the spacing between the branch pipes is narrow. From this point of view, it has become possible to further simplify construction work and reduce costs.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, underground city gas supply main pipe (1)
2 connected to the upstream side of the area to be repaired (1m)
Main branch pipe (2) + (3), two branch pipes (4) + (5) connected to the downstream side (2a),
(3a).

An opening is formed at (4a) + (5a). That is, for example, branch pipe (2) + (3) + (4) l (
5) Form an opening in the meter standpipe by removing the customer gas meter and meter cock.

Next, as shown in FIG. 2, the hose (6) can be freely inflated by the pressurized fluid supply device (7) connected to the hose (
A bag (8a) that can be freely deflated by discharging fluid from 6) and can be freely pulled out using a hose (6).
l (8b) to the most upstream and most downstream branch pipes (2)
t (5) above ground part (28), ('5m)
1) into the interior with pressurized gas from the blower (9),
The bags are inflated with pressurized fluid from the device (7), and the inflated bags (81) and (8b) block the main pipe (1) at two points.

Next, as shown in Fig. 8, pipe 4 with a blower (9) for supplying pressurized gas is connected to the upstream branch pipe (3), and a pipe 4 with a blower (9) is connected to the pipe αQ on the discharge side of the blower (9). A tank αυ for supplying a sealant or lining agent is connected to the downstream branch pipe (4), and a recovery device 4 separates and recovers the sealant or lining agent from the gas, and a burner q3 burns the city gas to be purged. Connect in that order.

Next, the pressurized gas is supplied to the upstream branch pipe (
3), the sealant or lining agent from the tank (1) is sent in the order of upstream branch pipe (3), main pipe (1), and downstream branch pipe (4) in the form of foam or by air conveyance. ,
Perform sealing or lining treatment on the main pipe (1) and both branch pipes (3) and (4).

When the sealing or lining process is completed, remove the blower (9), tank (6), collector, burner, etc. from the branch pipe (3) l (4), and remove the bag (8a), (8b).
) is contracted and pulled out using the hose (6), and the four branch pipes (2) + (3), (4) l (5) are restored and the city gas supply resumed.

[Another example]

Next, another embodiment will be described.

Branch pipe (2) for inserting and removing buff tubes (81) and (8b)
) I (5) may be a plurality of pipes on one or both of the upstream and downstream sides, and one or both of the upstream and downstream branch pipes (3) and (4) to be repaired may also be used. 0 Bags (88) and (8b) can be appropriately selected in terms of material, shape, etc., and bags (8a),
(8b) is inserted into the branch pipe (2) (5).
, (5). Further, various types of air blowing equipment can be used to forcefully feed the bags (8a) and (8b), and the bag (7) may also be fed using a flexible pushing tool.

Various gas or liquid supply equipment can be used to inflate the bags (81), (8b);
(8b), put the rigging in the bag (88
), (8b) may be connected.

The sealant or lining agent may be supplied from the downstream branch pipe (4) or from one branch pipe (3) or (4) to a plurality of branch pipes (4) or (3). It is also possible to supply the main pipe (1) from a plurality of branch pipes (3) or (4); in short, how the sealing agent or lining agent is supplied and recovered can be changed as appropriate depending on the situation. can. Also, downstream and upstream branch pipes (3)? Various gas and ventilation equipment can be used to supply pressurized gas from one side to the other (4).

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 (1) may be hidden in the structure, in which case the branch pipe (2) l (3) t (4) +
The external exposed part of (5) is the above-ground part (2') = (8a)
* Referred to as (4&) and (5a).

[Brief explanation of drawings]

1 to 8 are conceptual diagrams illustrating the procedure of the method of the present invention. FIG. 4 is a conceptual diagram of a conventional example. (1)--master, (2) + (3), (4)
+ (5)...Branch pipe, (21k)l (a
m) + (41), (sa)... Above ground part of branch pipe, (8a), (8b)... Bag.

Claims (1)

[Claims] At least two bags (8a) and (8b) configured to be able to be inflated and deflated and withdrawn from the ground are placed in the above ground portion of at least two branch pipes (2) and (5) within the main pipe (1). (2
a) and (5a) respectively to inflate the main pipe (1) at least in two places with the inflated bags (8a) and (8b), and the bag (8) of the main pipe (1) is
Aboveground portion (3) of one of the upstream branch pipe (3) and downstream branch pipe (4) connected between adjacent ones of a) and (8b)
a) or (4a), while supplying a sealant or lining agent by pressurized gas, and the other above-ground portion (4a) of the upstream and downstream branch pipes (3), (4); While discharging gas from (3a), one of the upstream and downstream branch pipes (3) and (4) is connected to the main pipe (1)
) A method for repairing city gas pipes that send sealant or lining agent through the pipe.