JPH0529513B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of running a line through a main pipe buried or hidden by a structure in a city gas pipeline using a pressure-feed type traction device.

[Prior art]

Conventionally, both sides of the main pipe were excavated and opened, and the traction tool connected to the wire was fed from one opening to the other, or only one side of the main pipe was opened. A towing tool was forced into the opening formed in the main pipe from the above-ground part of the branch pipe connected to the other side by digging it out and opening it (I can't provide any literature).

[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 disposal of the excavated soil, and there is no improvement in terms of both workability and construction cost. There was room.

An object of the present invention is to enable wiring to a buried or hidden main pipe by extremely rational means without requiring any digging or opening in the main pipe.

[Means for solving problems]

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 the ground parts of at least two branch pipes respectively. The main pipe is blocked at at least two places with bags, and the above-ground part of one of the upstream branch pipe and the downstream branch pipe connected between the adjacent bags of the main pipe is connected to the wire. Insert the traction device and supply pressurized gas to the branch pipe into which the traction device is inserted.
and while discharging gas from the above-ground portion of the other of the upstream and downstream branch pipes, passing the gas from one of the upstream and downstream branch pipes to the other through the main pipe,
The purpose of this invention is to force-feed the traction tool, and its effects are as follows.

[Effect]

In other words, a towing tool inserted from the above-ground part of one branch pipe is sent to the main pipe and then to the above-ground part of the other branch pipe by the pressurized gas supplied to that branch pipe, and the line is routed. , from the above-ground part of the upstream branch pipe to the above-ground part of the downstream branch pipe, and is passed through the upstream branch pipe, the main pipe, and the downstream branch pipe.
After that, remove the equipment that supplies pressurized gas to the branch pipe, connect an appropriate device to one end of the line,
By pulling the other end of the wire, the device is introduced from the branch pipe into the main pipe, and by the introduced device, and
The device can be moved within the main pipe through wires to perform cleaning, lining, inner surface inspection, and other appropriate treatments on the main pipe.

Furthermore, since the main pipe is blocked on both the upstream and downstream sides by the bag introduced from the above-ground part of the branch pipe, it is difficult to feed the towing tool from the main pipe to the exhaust side branch pipe, for example, for city gas. Compared to the case where the supply is continued, the pressurized gas supply amount can be greatly reduced and the process can be carried out smoothly and reliably.Also, after the main pipe has been subjected to the specified treatment, all the bags are deflated and removed from the branch pipe. city gas can be restarted.

Furthermore, as pressurized gas is supplied from one branch pipe, the gas is discharged from a local branch pipe and the towing equipment is fed under pressure, so for example when supplying pressurized city gas from one branch pipe to the other. In contrast, no matter how large the interval between the upstream and downstream branch pipes is, the pressurized gas supply equipment can be made smaller and can be easily installed.

〔Effect of the invention〕

As a result, the above-ground portion of the branch pipe is effectively used to cut off the main pipe with a bag, route the wire to the main pipe, connect the main pipe with the wire, and take out the bag, all without the need for excavating the main pipe or forming an opening. It has become possible to carry out construction easily, quickly, and at low cost.

In addition, the equipment for supplying pressurized gas for pressure-feeding towing tools can be small and have a fairly low discharge pressure, making transportation and piping of the equipment easy and quick, and the power required for the equipment. The cost can be reduced, and from this aspect as well, it has become possible to further simplify the construction work and reduce costs.

〔Example〕

Next, examples will be shown.

As shown in FIG. 1, prior to performing appropriate treatments such as cleaning, applying lining material, and internal inspection on a part 1a of the underground city gas supply main pipe 1, a part 1a to be treated is prepared. Two branch pipes 2, 3 or 4, respectively, on the upstream and downstream sides of
Openings are formed in the above-ground portions 2a, 3a, 4a, and 5a of 5. That is, for example, an opening is formed by removing a customer gas meter and a meter cock from a meter standpipe serving as a branch pipe.

Next, as shown in FIG. 2, the hose 6 was configured to be able to be freely inflated by a pressurized fluid supply device 7 connected to the hose 6, deflated by discharging fluid from the hose 6, and freely withdrawn by the hose 6. Two bags 8a and 8b are inserted into the main pipe 1 from the above-ground parts 2a and 5a of the most upstream and most downstream branch pipes 2 and 5,
The device 7 is fed by pressurized gas from the blower 9.
The inflated bag 8 was inflated with pressurized fluid from
The main pipe 1 is blocked at two places by a and 8b.

Next, purge the city gas in the upstream branch pipe 3, main pipe 1, and downstream branch pipe 4 as necessary, and as shown in FIG. 9 and the above ground portion 3a of the upstream branch pipe 3 with the line 10 connected thereto.
At the same time, insert the blower 9 into the upstream machine pipe 3.
While supplying a suitable type of pressurized gas, preferably free of enzymes, to the upstream branch pipe 3 and discharging the gas from the above-ground portion 4a of the downstream branch pipe 4, the towing tool 9 is connected. The upstream branch pipe 3, the main pipe 1, and the downstream branch pipe 4 are fed under pressure in this order, and as shown in FIG.
It passes through both the branch pipes 3, 4 and the main pipe 1 over the above-ground parts 3a, 4a of 4.

In addition, after the wiring is completed, the blower 9 is removed from the branch pipe 3, and the equipment is introduced into the main pipe 1 from the above-ground part 3a or 4a of the branch pipe 3 or 4 by pulling with the wire 10, etc. 1 and branch pipes 2 and 3.

After the treatment is completed, the device is pulled out through the wire 10, the bags 8a and 8b are contracted and pulled out through the hose 6, and city gas is supplied to the upstream branch pipe 3, main pipe 1, and downstream branch pipe 4 as needed. Charge and restore and connect the four branch pipes 2 to 5.
City gas supply will be resumed.

[Another example]

Next, another embodiment will be described.

The bugs 8a, 8b, the traction device 9 and the wire 10 are
The material, shape, etc. can be selected appropriately, and in order to insert and take out the bags 8a, 8b, traction tool 9, and wire 10 into and out of the branch pipes 2 to 5, an appropriate jig can be used for the branch pipes. You can use it by connecting it to 2 to 5.

The branch pipes 2 and 5 into which the bags 8a and 8b are inserted and removed are as follows:
A plurality of pipes may be provided on one or both of the upstream and downstream sides, and one or both of the upstream and downstream branch pipes 3 and 4 for wire passage may be used.

Various types of ventilation equipment can be used to force feed the bags 8a and 8b, and a flexible pushing tool can be used to forcefully feed the bags 7a and 8b.
You may also send Various gas or liquid supply equipment can be used to expand the Bazugs 8a and 8b.
To pull out the bags 8a, 8b, a traction device for this purpose may be connected to the bags 8a, 8b.

The traction tool 9 may be inserted from the downstream branch pipe 4, and when pressurized gas is supplied from one of the upstream and downstream branch pipes 3, 4 when the traction tool 9 is forced to be fed,
Various types of ventilation equipment can be used, and the air may be sucked in from the other of the branch pipes 3 and 4 using ventilation equipment.

The main pipe 1 may be hidden in a structure, in which case the externally exposed parts of the branch pipes 2 to 5 are referred to as above-ground parts 2a to 5a.

[Brief explanation of drawings]

1 to 4 are conceptual diagrams illustrating the procedure of the method of the present invention. DESCRIPTION OF SYMBOLS 1... Main pipe, 2... Branch pipe, 2a... Above ground part of branch pipe, 3... Upstream branch pipe, 3a... Above ground part of upstream branch pipe, 4... Downstream branch pipe, 4a...
...Aboveground portion of downstream branch pipe, 5... Branch pipe, 5a
... Above ground part of the branch pipe, 8a, 8b... Buzz,
9... Traction equipment, 10... Wiring.

Claims (1)

[Claims] 1 At least two bags 8a and 8b configured to be able to be expanded and contracted from the ground and can be freely pulled out are installed in the above-ground portion 2 of at least two branch pipes 2 and 5 within the main pipe 1.
a, 5a to be expanded, the expanded bags 8a, 8b block the main pipe 1 at at least two places, and the upstream side is connected between adjacent bags 8a, 8b in the main pipe 1. A traction tool 9 connected to the line 10 is inserted from the aboveground portion 3a or 4a of one of the branch pipe 3 and the downstream branch pipe 4, and pressurized gas is supplied to the branch pipe 3 or 4 into which the traction tool 9 is inserted. While supplying gas and discharging gas from the other above-ground portion 4a or 3a of the upstream and downstream branch pipes 3, 4, the main pipe is transferred from one of the upstream and downstream branch pipes 3, 4 to the other. 1. A method for running a city gas pipe through which the pulling tool 9 is force-fed.