JPS61103585A - Method for lining branch pipe in city gas duct - Google Patents

Abstract

PURPOSE:To paint excellently with a liq. lining agent by sending a tractor, which is brought in from one branch pipe on the ground, to the other branch pipe of the ground through a main pipe with compressed gas, passing a through wire through both branch pipes and main pipe, and pulling a body with the through wire. CONSTITUTION:A tractor 4 connected to a through wire 5 is inserted from the part 2a on the ground of one between two branch pipes 2 and 3 which are connected to a main pipe 1, and the tractor 4 is forced successively through the branch pipe 2 wherein the tractor is inserted, the main pipe 2, and the other branch pipe 3 from the part 2a on the ground while supplying compressed gas from the part 2a on the ground of the branch pipe. A liq. lining agent 8 for coating the inner surface of the branch pipe 2 is then charged into the branch pipe 2 from the part 2a from the part 2a on the ground, and a body 9 for coating the lining agent 8 on the branch pipe 2 is connected to the through wire 5, brought in from the part 2a on the ground, pulled by the through wire 5, and moved through the inside of the branch pipe 2. Namely, the lining of the branch pipe can be performed easily, rapidly, and at low cost without dig ging out or cutting the joint between the main pipe and the branch pipe.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is a method of applying a liquid lining agent to the inner surface of a branch pipe connected to a main pipe buried or hidden in a structure in a city gas pipeline. This invention relates to a method of lining with an object.

[Prior art]

Conventionally, the connection point between the main pipe and branch pipe was excavated and then cut, and before the tube was introduced, the wire was passed through the branch pipe using a pressure-feeding traction device, and the object was moved within the branch pipe by the wire passage, and the lining agent was branched. It was smeared on the tube (I can't provide any references).

[Problem that the invention seeks to solve]

However, it takes a lot of time to excavate and cut the connection points between the main pipe and branch pipes, it requires a lot of money to excavate and dispose of the excavated earth, and in addition, the city gas supply has to be interrupted. However, there was room for improvement in terms of workability, construction cost, and gas supply. One object of the present invention is to use extremely rational means to eliminate the need for excavation or cutting of the connection points between the main pipe and branch pipes, and to allow the city gas to continue to be supplied.
The object of the present invention is to enable the inner lining of the branch pipe to be applied using a liquid lining agent and an application object.

[Means to solve the problem]

The characteristic means of the present invention is to insert a traction tool connected to one line from the ground part of one of the branch pipes connected to the main pipe, and while supplying pressurized gas from the ground part of the branch pipe,
The towing tool is fed under pressure from the branch pipe into which it is inserted, to the main pipe, and then to the other branch pipe, and a liquid lining agent is introduced from above ground into at least one of the branch pipes to coat the inner surface thereof, and the lining is The object for applying the agent to the branch pipe is connected to the wire from the above-ground portion, and is pulled and moved within the branch pipe by the wire.The operation and effect are as follows.

[Function] In other words, the towing tool inserted from the above-ground part of one branch pipe,
By sending pressurized gas from the main pipe to the above-ground parts of other branch pipes, one line can be passed across the above-ground parts of one branch pipe.
Can be passed through both branch pipes and main pipe. Then, by putting a liquid lining agent and an object into the branch pipe whose inner surface is to be lined from above the ground and pulling the object through the wire, the branch pipe can be lined with the liquid lining agent effectively.

〔Effect of the invention〕

As a result, the connection between the main pipe and the branch pipe can be excavated by making effective use of the above-ground part of the branch pipe, by running wires between both branch pipes and the main pipe, supplying lining agent to the branch pipe, and moving objects using the wires. No cutting or cutting is required at all, making the construction process easier, faster, and less expensive.

In addition, construction work can be carried out while the main pipe continues to supply city gas to other branch pipes, and the branch connected to the buried or hidden main pipe is advantageous in terms of ease of construction, economy, and gas supply overall. Pipes can now be lined with a liquid lining agent and a coating material.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, the main underground city gas supply pipe (11
It connects to the nine branch pipes (21y (2), (3) and forms an opening in the above-ground parts (2a) + (3a). In other words, for example, the meters as one branch pipe (2) and (3) Create an opening in the standpipe by removing the customer gas meter and meter cock.

Next, as shown in FIG. 2, a suitable pressure-feeding towing device (4), such as a parachute or a windsock type, is attached.

With the line (5) connected to it, connect the upstream branch pipe (2
), and connect a pipe (7) with a blower (5) for supplying pressurized city gas from the downstream branch pipe (3) to the upstream branch pipe (2).

Next, while supplying pressurized city gas into the upstream branch pipe (2) by the blower (5), the traction tool (4) is moved to the upstream branch pipe (2), the main pipe 111, and the downstream branch pipe (3). ), and as shown in FIG.
2a) + (3a), both branch pipes +21
Pass it through IC2), (3) and main pipe fi+.

In addition, the air volume and discharge pressure from the blower (5) should be adjusted from the main pipe (1).
Then, the flow velocity should be at least 7■- or more, preferably -M- or more, and the flow velocity in the branch pipes (211+2) and (3) should be equal to or more than that of the main pipe fi+, preferably the flow velocity of the main pipe (1). If you make it more than twice the amount, the master +1
) to the branch pipe (3) downstream from the main pipe (1) and the downstream branch pipe (3).
), the flow velocity in the main pipe 11), and other conditions, the air volume and discharge pressure of the blower (5) are determined appropriately.

Next, pipe (7) is connected to branch pipe +2) l +2), (3
), as shown in Figure 4, the length of the branch pipe (2) measured in advance using the wire (5),
) Pour an appropriate amount of liquid lining agent (8) into the first branch pipe (2) according to the diameter of the pipe and the thickness of the lining (
Insert from 2a). Further, an object (9) for applying a lining agent (8) to the branch pipe (2) is inserted into the branch pipe (2) from its above-ground portion (2a) while connected to the single line (5).

Next, as shown in Fig. 5, the wire (5) is pulled from the above-ground part (3a) of the other branch pipe (3) by a suitable means such as a quinch (lO), and the wire (5) is pulled. object (
9) is moved inside the branch pipe (2) toward the main pipe (1) at a speed suitable for lining, and the object (9) suppresses the lining agent (8) while applying it to the entire inner surface of the branch pipe (2). Apply at a suitable thickness.

Then, the object (9) is passed through the wire (5) from the other branch pipe (3).
) along with the other branch pipe (3) if necessary.
The liquid lining agent (8
) and object (9), and finally, both branch pipes +211 +2) and (3) are restored and the city gas supply to those branch pipes (2+ = (2), (3) is resumed).

[Another example]

Next, another embodiment will be described.

The traction tool (4) and the wire (5) can be appropriately selected in terms of material, shape, etc.
) inserted into the branch pipe +211f3) Ic, use an appropriate jig to remove it from the branch pipe +211f3).
, (3).

Various types of ventilation equipment can be used to supply pressurized city gas from the downstream branch pipe (3) to the upstream branch pipe (2) during wiring, and pressurized city gas of the same quality or combustibility as city gas can be used. Gas may be supplied to the upstream branch pipe (2) from a suitable air supply device and, if the flow velocity in the main pipe ftl is low, from the downstream branch pipe (3) to the upstream branch pipe (2). You may run a wire to.

The lining agent (8) can be a two-component mixture type, room temperature curing type, moisture curing type, or other types with various characteristics.

Further, the material, shape, structure, etc. of the object (8) can be changed appropriately.

The main pipe fi+ may be hidden in the structure, in which case the externally exposed part of the branch pipe +2) l F3+ is referred to as the above-ground part (2a)+(3a).

[Brief explanation of drawings]

1 to 5 are conceptual diagrams illustrating the procedure of the method of the present invention. (1)...Superintendent, +21 jf2), (3)
−・−・・・Branch pipe, (2a)+(3a)・・・・・・
Above ground part of branch pipe, (4)... Traction tool, (5)
...Wiring, (8) ...Lining agent,
(9)...object. ~ Agent Patent Attorney Osamu Komura Diagram 4 M5

Claims (1)

[Claims] The line (5
), and while supplying pressurized gas from the above ground portion (2a) or (3a) of the branch pipe, the tow tool (4) is inserted into the branch pipe () into which it is inserted. 2) or (3) is fed under pressure to the main pipe (1) and the other branch pipe (3) or (2) in this order, and the inner surface of at least one of the branch pipes (2) and (3) is A liquid lining agent (8) for coating the branch pipe (2) is introduced from the above-ground part (2a), and an object (9) for applying the lining agent (8) to the branch pipe (2) is introduced from the above-ground part (2a). Said line (5)
A method for lining a branch pipe in a city gas pipeline, which comprises connecting the line to the pipe, inserting the pipe into the branch pipe, and moving the pipe within the branch pipe while being pulled by the wire (5).