JPH0143198B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention connects conduit sections on the upstream and downstream sides of a construction site in a gas transport conduit for medium-pressure gas or the like using a bypass pipe, and A conduit portion downstream of the upstream communication portion of the bypass pipe with respect to the conduit and a conduit portion upstream of the downstream communication portion are respectively inserted into the conduit using a no-blow device and a tool, and are inflated. In the uninterrupted flow type non-blowout shutoff method in which the upstream and downstream bags are used to shut off the work, and then conduit work is carried out at the construction site, after the conduit work is completed, the transported gas in the conduit upstream of the upstream bag is Introduced into the construction completed conduit section between both bags, and on the other hand, a dispersion flow path with a valve attached to the insertion guide pipe of the downstream bag is connected in advance to the upstream side of the downstream bag. By opening the valve of the diffusion channel, the air on the upstream side of the downstream bag is discharged to the outside through the diffusion channel as transport gas for air purge is delivered to the downstream side of the upstream bag, and the construction is completed. The present invention relates to a method of air purging a conduit section.

[Conventional technology]

Conventionally, as disclosed in Japanese Patent Publication No. 56-8234, for example, an insertion guide tube for the upstream bag is connected to a bypass pipe connected to the upstream conduit through a connecting pipe, and the bypass Transport gas from the pipe is sent to the downstream conduit from the upstream bag through the communication pipe and the insertion guide pipe, and on the other hand, the air from the upstream side of the downstream bag is transported using the insertion guide pipe of the downstream bag. It was being released externally as gas was introduced.

[Problem to be solved by the invention]

However, the work of connecting the bypass pipe and the feed guide pipe with the connecting pipe and the work of separating the connecting pipes took a considerable amount of effort, resulting in a disadvantage that the construction time was increased.

An object of the present invention is to facilitate the construction work and shorten the construction time by making it possible to omit pipe connection and separation work when performing air purge using a transport gas.

[Means to solve the problem]

The characteristic means of the present invention is that, before carrying out the supply of air purge transport gas to the conduit section for which construction has been completed, a hose is provided in advance through the upstream bag, and a hose with a valve is attached to the insertion guide pipe of the upstream bag. Connect one end of the hose to one end of the communication channel,
The other end of the hose is opened on the upstream or downstream side of the upstream bag, the insertion guide tube is communicated with the downstream or upstream side of the upstream bag, and the other end of the communication channel, and the valve of the communication channel is opened. The purpose is to open the upstream bag and send air purge transport gas from the upstream side to the downstream side of the upstream side bag through a hose, a connecting flow path, and an insertion guide, and its functions and effects are as follows.

[Effect]

That is, as illustrated in FIG. 1, the conduit sections on the upstream side and the downstream side of the construction site 2 in the gas transport conduit 1 are connected by the bypass pipe 5, and on the downstream side from the upstream connecting part of the bypass pipe 5. The gas transport conduit 1 is shut off by the upstream bag 3, and on the upstream side of the downstream connection part of the bypass pipe 5, the gas transport pipe 1 is shut off by the downstream bag 4, and in this state, the conduit work at the construction site 2 is carried out. After that, air purge of the conduit section 1A for which construction has been completed is carried out as follows.

(B) As illustrated in FIG. 1, the hose 17 passing through the upstream bag 3 is connected to the communication channel 18 that communicates with the insertion guide tube 8b, and gas is transported upstream from the upstream bag 3. Connect the insertion guide tube 8b to the conduit 1, and insert the insertion guide tube 8b into the upstream bag 3.
It is connected to the gas transport conduit 1 on the downstream side, and the valves 15b and 16b are opened to transfer the transport gas from the upstream side of the upstream bag 3 to the hose 17.
It is made to flow in the order of → communication channel 18 → insertion guide tube 8b and is sent to the construction completed conduit section 1A for air purging.

Alternatively, (b) As illustrated in FIG. 2, the hose 17 passing through the upstream bag 3 is connected to the communication channel 18 that communicates with the insertion guide tube 8b, and the Connect the gas transport conduit 1 and insert the insertion guide tube 8b into the upstream bag 3.
It is connected to the gas transport conduit 1 on the more upstream side, and the valves 15b and 16b are opened to allow the transport gas from the upstream side of the upstream bag 3 to flow in the order of the insertion guide pipe 8b → the communication channel 18 → the hose 17. Flow it and send it to the conduit section where construction is completed for air purging.

On the other hand, (c) as illustrated in FIG. 1, the insertion guide tube 8c of the downstream bag 4 is communicated with the upstream side of the downstream bag 4, and the diffusion flow path 22 is connected to the insertion guide tube 8c. Then, the valve 15c is opened, and the air on the upstream side of the downstream bag 4 is sent from the insertion guide pipe 8c to the dispersion channel 22 and discharged to the outside as the transport gas for air purge is fed.

Alternatively, (iv) as illustrated in FIG.
The valve is opened and the air on the upstream side of the downstream bag 4 is sent from the hose 24 to the dispersion flow path 22 as the transport gas for air purge is supplied to the outside. discharge.

In short, even if the operation is as simple as simply opening the valve using a pre-prepared hose, a connecting flow path with a valve, and an insertion guide tube, it is not necessary to connect the air purge piping as in the prior art described above. Transport gas for air purge can be fed to the downstream side of the upstream bag without having to do so.

Therefore, the air purge operation can be performed easily and quickly, and the equipment removal operation after the air purge can be performed easily and quickly without the need for separating the air purge piping as in the prior art described above.

〔Effect of the invention〕

As a result, we were able to establish an air purge method for non-flow, no-blowout shutoff construction of gas transport conduits, which allows air purge using transport gas to be carried out in a short period of time with less effort, and is even more superior in terms of labor saving and shortening construction time.

〔Example〕

Next, an example will be shown with reference to FIG.

The upstream and downstream conduit sections of the construction site 2 in the gas transport conduit 1 are connected using a bypass pipe 5, and the bypass pipe 5 for the conduit 1 is connected to each other.
A conduit portion downstream from the upstream connecting part of the
The sections of the conduit upstream from the downstream communication section are each shut off using pressure bags 3 and 4 which are inserted into the conduit 1 using non-splashing equipment and tools and are inflated.

The work procedure up to the illustrated state is as follows.

No-spout tool bodies 6a, 6 are installed in the conduit 1 at two locations on the upstream side and two locations on the downstream side of the construction site 2.
b, 6c, and 6d, set a non-jet perforator (not shown) in each of the main bodies 6a to 6d, and install shutters 7a, 7b, 7c, and 7d [gate valves,
(including sluice valves, etc.), the hole saw of the drilling machine is lowered and rotated to drill into the conduit 1, the hole saw is pulled up, shutters 7a to 7d are closed, and the drilling machine is moved to the main bodies 6a to 6.
Remove from d.

A bypass pipe 5 is connected to the main bodies 6a and 6d, and pressure bag insertion guide pipes 8b and 8c are connected to the main bodies 6d and 6c, respectively. Open the shutters 7a and 7b, select and operate the valves 9 and 9' installed in the bypass pipe 5, and
purge the air in the bypass pipe 5 from 10',
After completing the transportation gas replacement, open both valves 9 and 9'.
Bypass pipe 5 allows gas to be transported.

Open the shutters 7b, 7c and guide tube 8.
Insert the pressure bags 3 and 4 in b and 8c into the conduit 1, open the valves 11b and 11c, and disconnect the hose 1.
2b and 12c force fluid (usually air) from a pressure source (not shown) into the bags 3 and 4, and inflate the bags 3 and 4 to block the flow in the conduit 1,
Close the valves 11b and 11c.

At this time, the bag 3 is moved by the upstream guide 13b.
is guided to the upstream side of the guide tube 8b, and the bag 4 is guided to the downstream side of the guide tube 8c by the downstream guide 13c.

Thereafter, the pressure inside the bypass pipe 5 is measured using the pressure gauge 14 of the bypass pipe 5 to confirm that gas transport is being carried out.Also, with the valve 15b closed and the valve 16b opened, The pressure change inside the pipe is measured with the pressure gauge 23,
Check the deadline performance of Bag 3.

For safety, please attach an auxiliary pressure bag to conduit 1.
In this case, the auxiliary pressure-resistant bag is used near the downstream side of the upstream bag 3 and near the upstream side of the downstream bag 4.

In the above-mentioned state, conduit work is carried out at the construction site, and after the conduit work is completed, air purge is performed on the completed conduit section 1A.Next, the air purge will be explained.

(b) For air purge, install upstream bag 3 in advance.
The hose 17 is provided in a penetrating state, and the valve 15 is attached to the insertion guide pipe 8b of the upstream bag 3.
A hose 1 is attached to one end of the communication channel 18 with b, 16b.
7, the other end of the hose 17 is opened on the upstream side of the upstream bag 3, and the insertion guide tube 8 is opened.
b on the downstream side of the upstream bag 3 and the connecting channel 18
A valve 15b is connected to the other end and attached to the insertion guide tube 8c of the downstream bag 4.
A dispersion channel 22 is connected to the upstream side of the downstream bag 4.

(b) Open the valves 15b and 16b of the communication channel 18 and the valve 15c of the diffusion channel 22, and transport gas from the upstream side of the upstream side bag 3 to the downstream side of the hose 17, the communication channel 18, and the insertion guide tube 8b. As the transport gas is introduced, the air on the upstream side of the downstream bag 4 is discharged to the outside through the diffusion channel 22.

At this time, by adjusting the opening degrees of the valves 15b, 16b, and 15c, the pressure of the introduced gas is adjusted to the optimum value for reliable and rapid air purging using the pressure gauge 23.

When the air purge is completed, the valves 11b, 11
Open c and deflate bags 3 and 4,
4 is pulled up and stored in the guide tubes 8b and 8c. The shutters 7b and 7c are closed to block the perforation of the conduit 1, and the guide tubes 8b and 8c are connected to the main bodies 6b and 6.
c. Remove from. Also, the shutters 7a and 7b are closed and the bypass pipe 5 is removed from the main bodies 6a and 6d.
Finally, attach the non-jet plug installation machine (not shown) to the main body 6.
a, 6b, 6c, 6d, and shutter 7.
Open the shutters 7a to 7d, set the closing plug in the hole, and close the shutters 7a to 7d again.

The main bodies 6a to 6d may be removed, but may be left in place for safety reasons.

[Another example] Next, another embodiment will be described.

In the embodiments described above, the procedures may be reversed or multiple procedures may be performed simultaneously.

As shown in FIG. 2, the upstream bag 3 may be located downstream of the insertion guide tube 8b, and the downstream bag 4 may be located upstream of the insertion guide tube 8c.
In this case, the hose 17 passing through the upstream bag 3
the end of which is opened on the downstream side of the upstream bag 3,
The insertion guide tube 8b is communicated with the upstream side of the upstream bag 3. Further, one end of the hose 24, which has been passed through the downstream bag 4 in advance, is connected to a valved dispersion channel 25 provided in the insertion guide tube 8c, and the other end is opened on the upstream side of the downstream valve 4.

The upstream bag 3 inserted in the state shown in FIG. 1 and the downstream bag 4 inserted in the state shown in FIG. 2 may be combined, or the upstream bag 3 inserted in the state shown in FIG. The downstream bag 4 inserted in the state shown in FIG. 1 may be combined.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the invention, and FIG. 2 is a partially cutaway side view showing another embodiment of the invention. 1... Conduit, 1A... Construction completed conduit section, 2...
...Construction location, 3...Upstream bag, 4...Downstream bag, 5...Bypass pipe 5, 8b, 8c...Insertion guide pipe, 15b, 16b...Valve, 17...
...Hose, 18...Connection channel, 22 or 25...
Dissipation channel.

Claims (1)

[Scope of Claims] 1. Conduit sections on the upstream side and downstream side of the construction site 2 in the gas transport conduit 1 are connected to each other using a bypass pipe 5, and from the upstream side communication part of the bypass pipe 5 with respect to the conduit 1 The downstream conduit portion and the conduit portion upstream from the downstream communication portion are each inserted into the conduit 1 using non-jet equipment and tools,
and the upstream and downstream bags 3 and 4 to be inflated.
After that, the conduit work is carried out at the construction point 2, and after the conduit work is completed, the transport gas in the conduit upstream of the upstream bag 3 is transferred to the part of the conduit between the two bags 3 and 4 where the work has been completed. 1A, and on the other hand, in advance the insertion guide tube 8c of the downstream side bag 4.
A diffusion channel 22 or 25 with a valve attached to the
By communicating with the upstream side of the downstream bag 4 and opening the valve of the diffusion passage 22 or 25, the downstream bag 4 is connected to the upstream side of the downstream bag 4, and by opening the valve of the diffusion passage 22 or 25, the downstream side In an uninterrupted flow type non-blowout shutoff construction method in which air on the upstream side of the side bag 4 is discharged to the outside through the diffusion channel 22 or 25 to perform air purge of the construction completed conduit section 1A, for air purging to the construction completed conduit section 1A. To carry out transport gas supply, a hose 17 is provided in advance in the upstream bag 3 in a penetrating state, and one end of the communication channel 18 with valves 15b and 16b attached to the insertion guide pipe 8b of the upstream bag 3 is installed in advance. Connect one end of the hose 17 to
The other end of the hose 17 is opened upstream or downstream of the upstream bag 3, and the insertion guide tube 8
b communicates with the downstream side or upstream side of the upstream bag 3 and the other end of the communication channel 18, and opens the valves 15b and 16b of the communication channel 18 to connect the upstream side of the upstream bag 3. An air purge method in an uninterrupted flow type no-blowout shutoff construction method in which transport gas for air purge is sent downstream from the hose 17, the connecting flow path 18, and the insertion guide 8b.