JPH03292490A - Lining process for branch pipe of live pipeline and apparatus thereof - Google Patents

Abstract

PURPOSE:To enable it to line a branch pipe without excavating it, namely, leaving it live intact by closing the branch pipe airtightly at two spots holding it in between as securing a passage for a fluid through the inside of a branch pipe handler inserted into a live pipeline, and making the tip so as to be opened in a gap with the closing position and the rear part to have the branch pipe interconnected to the outside air. CONSTITUTION:An insert device 3 is attached to a main pipe 1 of a live pipeline, and a handling pipe 5 is inserted into it via in insert member 4, and a handler 6 is installed in the tip end. The handler 6 is reached to a service tee 8 of a branching part of the main pipe 1 of the handler 6, and a passage of a fluid is secured through the inside of the handler 6. An interval between an outer wall of the handler 6 and an inner wall of the main pipe is closed airtightly by a packer 21. A supply pipe 9 is interconnected to the outside air through the handler 6 whose tip end is opened at the closing position and the rear part is drawn out to the main pipe 1, whereby handling such as lining or the like is applied to this supply pipe 9. In consequence, there is unnecessary to excavate the branching part of the supply pipe, thus a construction period or the like is sharply savable.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to pipes mainly buried underground, such as gas pipes, water pipes, and sewer pipes. The present invention relates to a novel method and apparatus for lining and other necessary treatments on a branch pipe while allowing fluid to pass through the channel.

2. Description of the Related Art In recent years, it has become common practice to line the various pipes as described above for the purpose of repair or reinforcement.

These pipelines not only line main pipes buried in public roads, but also supply city gas and tap water from these main pipes to each household. Branch pipes are also required to be lined. Gas pipes in particular require lining because it is dangerous if gas leaks from branch pipes (referred to as supply pipes) for supplying city gas to households.

The method of lining the city gas supply pipe is as follows:
Two methods are generally used. One method is to dig up the branch part of the supply pipe, open the service pipe attached to the branch part, close the branch part, and disconnect the supply pipe between the service pipe and the connection part of the meter from the main pipe. This is a method of cutting it out and lining it.

Another method is to excavate and cut a main pipe in a predetermined range at both ends, use the area within that range as the main pipe, and line the supply pipes branching from the main pipe.

Moreover, the same thing is done not only when lining the supply pipes, but also when cleaning or other processing is performed on the supply pipes.

Problems to be Solved by the Invention However, these methods have many problems.

In other words, in the method of digging up branch parts, each branch part must be dug up one by one each time the supply pipe is lined, which is difficult to do, especially in areas with densely populated houses. Since the excavation will have to be continued without a break, the situation will be no different from digging up the entire main pipe, and the excavation costs, time, and restoration effort will be enormous.

In addition, in the method of cutting off a main pipe in a predetermined range, the pipe line in the cut off range becomes the source pipe, and becomes completely unusable until all the supply pipes are lined and the main pipes are reconnected.

Especially in the case of city gas, it is very dangerous if the gas leaks, so once the gas supply has been stopped, be very careful when restarting the supply, and be sure to check for gas leaks in the presence of the person being supplied. Therefore, stopping the supply to a large number of supply destinations at once requires a great deal of effort to restart the supply.

The present invention was made in view of the above circumstances, and it is possible to continuously line the supply pipes with lining, etc. without excavating each supply pipe one by one, while keeping the main pipes as live pipes through which city gas flows. The object of the present invention is to provide a method and an apparatus for performing the treatment.

Means for Solving the Problems The method of the present invention involves inserting a branch pipe treatment tool into the live pipe while flowing fluid through the live pipe, and moving the branch pipe treatment tool through the live pipe. At the branch point, the fluid is passed through the branch pipe processing tool to ensure a flow path for the fluid in the live pipe, and the branch is made between the outer wall of the branch pipe processing tool and the inner wall of the active pipe. A processing pipe whose tip is airtightly closed at two places sandwiching the part, whose tip is opened to the outer surface of the branch pipe processing tool between the closed positions, and whose rear part is drawn out of the live pipe after passing through the inside of the live pipe. This is characterized in that the branch pipe is communicated with the outside air through the pipe, and that the branch pipe is lined and other necessary treatments are performed on the branch pipe.

In addition, the processing tool of the present invention includes a cylindrical body whose front end and rear end are open, and two parts provided on the outer surface of the cylindrical body to airtightly close the space between the cylindrical body and the inner surface of the live pipe. It is characterized by consisting of a blocking member and a processing pipe whose tip opens to the outside of the cylindrical body at a position between the two blocking members and whose rear part is drawn out of the active pipe from an appropriate location. be.

Example Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the method of the present invention when applied to a gas conduit.

Reference numeral 1 denotes the main pipe of the conduit, in which a working hole 2 is excavated in the ground in a part thereof, and an insertion portion W3 is attached to the main pipe 1 within the working hole 2.

A processing tube 5 is inserted into the main pipe 1 via an insertion member 4 attached to the insertion device 3, and a processing tool 6 of the present invention is attached to the tip of the processing tube 5.

The rear part of the processing tube 5 is wound around a reel 7 installed outside, and a wire or the like is inserted into the processing tube 5 through the winding shaft of the reel 7, or a desired fluid is passed through the processing tube 5. It is now possible to send it to

A plurality of branch parts are formed in the main pipe 1, and a service tee 8 is attached to the main pipe 1 at the branch parts.
A supply pipe 9 branches from the service channel 8, and a meter 10
It is connected to the domestic plumbing via.

The present invention will be explained in more detail below.

First, to explain the structure of inserting the processing pipe 5 into the main pipe 1, a part of the main pipe 1 is dug up, and the pipe is inserted into the main pipe 1 as shown in Fig. 3 while still being an active pipe that carries city gas. Attach the metal fitting 11 to. The metal fitting 11 is made of a cylinder divided into two parts, which are joined together by sandwiching the main pipe 1, and are attached airtightly by tightening with bolts. An opening 12 through which the main pipe 1 is exposed is formed in the metal fitting 11, and a shutter 13 is provided in the opening 12.

A cylindrical drilling jig 14 is airtightly and removably attached to the outside of the shutter 13 in the metal fitting 11, and a hole saw 1 as a drilling tool is attached to the drilling jig 14.
5 is attached airtightly and rotatably.

Then, the shutter 13 is opened and the hole saw 15 is rotated and moved downward to drill a hole in the main pipe 1. At this time, it is also possible to cut out and divide a part of the main pipe 1 using a large-diameter punching tool, which is preferable.

Next, the hole saw 15 and the cut portion of the main pipe 1 are moved upward and housed in the drilling jig 14, the shutter 13 is closed, and the drilling jig 14 is removed from the metal fitting 11.

Then, as shown in FIG. 4, in place of the drilling jig 4, a processing tool insertion jig 16 equipped with the branch pipe processing tool 6 of the present invention is installed.

The processing tool insertion jig 16 has a cylindrical main body 17, and the main body 1
7 is connected to a metal fitting 11 at the lower end thereof. A support member 18 is obliquely attached to the side surface of the main body 17, and an insertion member 4 is attached to the support member 18 in an airtight and slidable manner to push the insertion member 4 into the main body 17. By inserting the insertion member 4 into the main pipe 1, the distal end of the insertion member 4 approaches the divided end of the main pipe 1.

A processing tube 5 is inserted through the insertion member 4, and the processing tube 5 is airtightly and slidably supported at the outer end of the insertion member 4. , the processing tool 6 of the present invention is attached. Note that the structure of the processing tool 6 will be explained in detail later.

Then, the insertion member 4 is moved backward, and the processing tube 5 is also moved back into the insertion member 4.
The processing tool 6 is retracted into the insertion member 4 by retracting it, and the processing tool insertion jig 16 is attached to the metal fitting 11. After that, open the shutter 13 and push in the insertion member 4,
The tip thereof faces the divided end of the main pipe 1.

By pushing the processing tube 5 into the insertion member 4, the processing tool 6 attached to the tip of the processing tube 5 enters into the main tube 1 and further advances within the main tube 1 to a desired position.

FIG. 2 shows an embodiment of the processing tool 6 of the present invention reaching a branch in the main pipe 1. FIG.

In the processing tool 6, reference numeral 19 is a cylindrical body, the tip is open, and the rear end has an opening 20 formed on the circumferential surface, and a flow path for city gas is formed in the front and back through the cylindrical body 19. has been done.

An annular backer 21 made of a flexible rubber-like elastic body is provided on the outer periphery of the cylinder 19 as a pair of blocking members, and is fitted into a fitting groove 22 formed on the outer surface of the cylinder 19. . Although the packer 21 is contracted in a normal state, it is enlarged by application of internal pressure and comes into pressure contact with the inner surface of the main pipe 1.

The processing tube 5 has its distal end connected to the cylindrical body 19 from the rear end.
It is attached to the cylindrical body 19 at a position between the backers 21 and 21, and is open to the outer surface of the cylindrical body 19.

Reference numeral 23 denotes a hose for pressurizing the pressure fluid into the packer 21.21, which extends rearward together with the processing tube 5 and connects to the insertion member 4.
It is pulled out from the outside. In the drawing, the hose 23 extends parallel to the processing pipe 5, but the hose 23 may be inserted into the processing pipe 5, and 24 is a sensor 24 that detects a branch in the main pipe 1.

Then, the processing tool 6 is advanced in the main pipe 1 as described above with the packer 21 contracted, and the sensor 24 detects the branching part of the main pipe 1, and the processing tool 6 is stopped there. .

Pressurized fluid is inserted from the hose 23 at this branch to expand the packer 21, and the packer 21 is brought into pressure contact with the inner surface of the main pipe 1 on both sides of the branch. Thereby, a flow path is secured for the city gas in the main pipe 1 from the opening 20 through the cylinder body 19, and the branch portion is isolated from the flow path.

If the connection between the supply pipe 9 and the meter 10 is removed, the necessary wires or fluids can be passed through the processing pipe 5 and the supply pipe 9. processing can be performed.

For example, by inserting a flexible cylindrical lining material from the end of the supply pipe 9 while inverting it with fluid pressure, by blowing resin liquid from the end of the supply pipe 9 with compressed air, or by inserting the resin into the supply pipe 9. Lining can be done in various other ways, such as by pouring resin liquid into the tube and passing it through a VIG. Further, by using a wire inserted through the supply pipe 9 and the processing pipe 5, cleaning can also be performed by passing a scraper or the like into the supply pipe 9.

Once the supply pipe 9 has been processed, the supply pipe 9 and meter 1
0 is reconnected and the injection of pressure fluid into the packer 21 is stopped, the buffer 7 car 21 is contracted and the inside of the main pipe 1 and the supply pipe 9 are communicated, and the supply of gas is resumed. Then, the processing tool 6 is further advanced within the main pipe 1, and the same processing is applied to the next supply pipe 9.

Function In the present invention, the city gas flow path before and after the processing tool 6 is communicated, and the space surrounded by the inner surface of the main pipe 1, the outer surface of the cylinder 19, and the two packers 21 is connected to the main pipe while keeping the pipe line alive. 1, and the space is isolated from the city gas flow path in the processing pipe 5.
Since the supply pipe 9 is connected to the outside via the meter 10, the branched supply pipe 9 in that space has no relation to the distribution of city gas within the main pipe 1, and only the supply pipe 9 can be separated from the meter 10 and processed independently. can be administered.

Effect of the invention Therefore, according to the present invention, the main pipe 1 itself remains active,
While normal city gas is continued to be supplied to the supply pipes 9 other than the supply pipes 9 to be treated, only a specific supply pipe 9 can be subjected to lining or other necessary treatments. Furthermore, there is no need to dig up the branch portion of the supply pipe 9 during the treatment, and construction costs and time can be greatly reduced.

Furthermore, since the branch part of the supply pipe 9 communicates with the outside through the processing pipe 5, wires can be inserted and fluids can be freely circulated.For example, when performing various treatments,
It is often necessary to pass a wire through the supply pipe 9, but in order to pass the wire, a parachute is attached to the end of the wire, etc., and the parachute is carried on the airflow and the wire is passed through the supply pipe 9.
It can be blown inwards and is extremely easy to insert.

[Brief explanation of drawings]

FIG. 1 is a central longitudinal cross-sectional view showing the implementation of the method of the present invention. FIG. 2 is a central vertical cross-sectional view showing the treatment tool of the present invention positioned at a branch of the main pipe. Further, FIG. 3 is a central vertical cross-sectional view showing a state in which a hole is being drilled into the main pipe, and FIG. 4 is a center vertical sectional view showing a state in which a processing tool is inserted into the main pipe having been drilled.

Claims (1)

[Claims] 1. While flowing fluid through the active pipe (1),
), insert the branch pipe treatment tool (6) into the
) is advanced through the live pipe (1) to reach its branching part,
At the branch part, the outer wall of the branch pipe treatment tool (6) and the inner wall of the active pipe path (1) are connected while ensuring a flow path for the fluid in the active pipe path (1) through the branch pipe treatment tool (6). The gap is airtightly closed at two locations sandwiching the branch part, and the tip is opened to the outer surface of the branch pipe processing tool (6) between the closed positions, and the live pipe (
1) The branch pipe (9) is communicated with the outside air through the processing pipe (5) whose rear part is drawn out from the live pipe (1) through the inside, and the branch pipe (9) is subjected to lining and other necessary treatments. Method 2 for processing a branch pipe of an active pipe line, characterized in that: a cylinder (19) with an open front end and a rear end; and a cylinder (19) provided on the outer surface of the cylinder (19). and live pipe (
1) Two blocking members (21
), and a processing pipe (5) whose tip is opened to the outside of the cylinder (19) at a position between the two blocking members (21) and whose rear part is drawn out of the active pipe (1) from an appropriate location. ) A tool for treating branch pipes of live pipes, characterized by: