JPS6325238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for removing or temporarily removing a part of an existing relatively small-diameter gas supply pipe and connecting a new pipe to it, or for installing a branch pipe. This relates to a construction method for performing piping work such as installing pipes without blowing out.

Conventionally, this type of construction method basically involves installing a clamp on the pipe body, attaching a drilling tool to the branch port of the pipe, using this drilling tool to make a hole in the pipe, and inserting a bag into the pipe from there to inflate it. After stopping the gas flow and cutting the pipe, and carrying out the specified piping work, the bag is deflated and removed, and the branch port is plugged.

With this method, it is necessary to leave a large and expensive clamp in the shape necessary for attaching a drilling tool or a bag insertion tool to the perforated part of the pipe body even after the piping work is carried out, which reduces construction costs. Not only is the cost high, but gas is ejected from the perforated part of the tube through the branch port of the clamp when the bag is attached or detached, so there is a risk of gas poisoning or fire.
It also leaves areas that pose a risk of gas leaks in the future.

Furthermore, in the case of small diameter pipes, the above principles are often not observed when constructing pipes because they do not allow a large amount of gas to be ejected, further increasing the risk of gas poisoning and fire.

The present invention eliminates the drawbacks of the conventional construction methods described above and provides a construction method that is easy to work, efficient, and highly safe.

The method of the present invention will be explained below with reference to the drawings. As shown in FIG. The hole 1a is installed in the fluid main pipe 1 by tightening the hole in an airtight manner, and the drilling device 4 with a hole saw 4a placed at the tip of the spindle 4b is attached thereon.The sluice valve 3a is fully opened and the hole 1a is made into the fluid main pipe 1 by lowering the hole saw 4a. established,
Thereafter, the hole saw 4a is raised, the sluice valve 3a is closed, and the drilling device 4 is removed.

Next, as shown in Fig. 2, a pressure-resistant bag insertion tool 5 is mounted on the non-jet tool body 3, and a vertically long cylinder is inserted from its upper opening, and a pressure-resistant bag 7 that can be expanded and contracted at its tip is inserted into the center of the tool. In addition, a bag insertion tube 6 comprising a series of tubes 6a with a check valve 8 attached to the outer proximal end is inserted, and the sluice valve 3a is fully opened to lower the tip until the tip passes through the hole 1a. Then, push the pressure bag 7 through the tube 6a so that it is located in the fluid main pipe 1 on the upstream side of the hole 1a.

At this point, an air compression pump 9 is connected to the check valve 8 at the external proximal end, and its operation forces air into the pressure bag 7 to inflate it and close the fluid main pipe 1, thereby releasing the fluid. Cut off.

After the fluid is cut off, the check valve 8 is closed as shown in FIG.
Remove the compression pump 9, leave the pressure bag 7 integrated with the tube 6a, and the check valve 8 as they are, and insert the bag insertion tube 6, pressure bag insertion tool 5, non-jet tool body 3, and clamp 2 in this order. After removing each from the main pipe 1, attach the cutter 10 to the outer periphery of the fluid main pipe 1 as shown in FIG. After cutting 1,
The removed portion 1b is removed while passing the tube 6a through the hole 1a. Thereafter, a predetermined pipe is connected to the cut end 1c of the fluid main pipe 1.

5, 6 and 7 show the cut end 1
This shows a part of an embodiment in which various types of piping are connected to the cut end 1c.A joint member 11 having an outlet 11a for the pressure-resistant bag 7 is airtightly attached to the cut end 1c. It passes through a tube 6a equipped with a check valve 8.

After that, a predetermined pipe is connected to one end of the joint member 11. After completing the piping work, close the check valve 8 to the tube 6a.
After removing the pressure bag 7 from the outlet 11a of the joint member 11, the lid member 1 is removed as shown in the figure.
2 to close the outlet 11a.

FIG. 5 shows a case where a part of the pipe is removed, and a socket is used as the joint member 11, and a cap is used as the cover member 12.

Figure 6 shows the procedure for reconnecting a pipe after temporarily removing a part of the pipe. A T-joint is used as the joint member 11, and the pipe connection port of the T-joint is connected. After the pressure bag 7 is taken out by the method described above, the take-out port 11a is closed with the cover member 12. FIG. 7 shows the procedure for arranging a branch pipe 14 in a part of the main fluid pipe 1. A bypass pipe 15 is provided at a predetermined position of the main fluid pipe 1, and the bypass pipe 15 is
5, the fluid main pipe 1 is cut and removed using the method described above, and after the piping having the branch pipe 14 is connected, the bypass pipe line 15 is removed.

As described above, in this invention, the flow of fluid is temporarily blocked by a pressure bag equipped with a check valve at the tip of the connected tubes, and then the hole for inserting the pressure bag is cut and removed. Since the pipes are connected through the joint member, even after the piping work has been completed, it is possible to connect the large-sized pipes to the perforated part of the pipe body, which is necessary for attaching a drilling tool or a bag insertion tool, etc., as in the conventional construction method. There is no need to leave expensive clamps in place, and piping work can be done using small and inexpensive fittings, which allows for economical construction and eliminates the risk of fluid leakage in this area. Since the hole for attaching and removing the pressure bag is also cut and removed, the hole can be made as large as possible, making it easier to attach and detach the pressure bag, improving work efficiency, and reducing damage to the pressure bag. Also, as for the fittings for connecting the pipes, general standard fittings can be used as appropriate depending on the specified pipes, and this has a great practical effect.

[Brief explanation of the drawing]

Each drawing sequentially shows the method of constructing a no-gush pipe according to the present invention. Fig. 1 is a partially longitudinal side view showing a mode in which a hole is provided in a fluid main pipe, and Fig. 2 shows a pressure-resistant pipe from the hole. Fig. 3 is a partially longitudinal side view showing a state in which the bag is inserted and expands to block the fluid; Fig. 3 is a partially longitudinal side view showing a state in which only the pressure-resistant bag is left and the others are removed; Fig. 4 is the same. FIG. 5, FIG. 6, and FIG. 7 are partial longitudinal side views showing an embodiment in which a joint member and piping are connected to the cut portion. . 1...Fluid main pipe, 1a...hole, 1c...cut end,
2... Clamp, 3... Non-jet tool body, 4... Punching device, 5... Pressure-resistant bag insertion tool, 6... Bag insertion tube, 6a... Tube, 7... Pressure-resistant bag, 8... Check valve, 10... Cutting machine, 11 ...Joint member, 12...Lid member.

Claims (1)

[Claims] 1 At a predetermined position in the fluid main pipe, a hole is provided by attaching the non-jet tool main body airtightly and a punching device to the main body, and from there, the pressure bag stored in the bag insertion tube is inserted into the fluid with the pressure bag insertion tool. Insert into the main pipe and inflate with compressed air through a tube with a check valve, with the fluid shut off.
After removing various devices such as the pressure bag insertion tool, the non-jet tool body, etc. from the fluid main pipe, a part of the fluid main pipe including the hole is cut and removed, and the pressure bag is removed from the cut end. One end of a joint member having a mouth is connected, and after connecting a predetermined pipe to the other end, the pressure bag is deflated and taken out from the pipe through the outlet, and the outlet is closed with a lid member. Piping construction method.