JP2531899Y2 - Jig for connecting lining repair pipe - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a method for refining and repairing buried pipes such as gas pipes and water pipes when forming a resin lining coating film on the inner surface of the pipe. The present invention relates to a connection jig for forming an uncoated portion of a lining so as not to hinder a welding operation at the time of pipe connection performed after construction.

[0002]

2. Description of the Related Art In laying pipes such as gas pipes and water pipes buried underground and in buildings, corrosion pits and cracks are formed in pipes over time, which may cause leakage. For prevention, lining repair is performed in which an epoxy resin is applied to the inner surface of the pipe to form a coating film.

Conventionally, this kind of lining repair method includes: For example, JP-A-54-127941 (JP-B-58-14826) and JP-A-54-15604
No. 6, No. 6, etc., by the spray airflow method, Further, for example, a method using a pig lining method disclosed in JP-A-55-44320,. Further, for example, those using a resin plug flow method disclosed in JP-A-57-105270 and JP-A-58-6272 are known.

When the lining of a pipe is to be repaired by the above-mentioned repair method, the pipe to be repaired is cut into a section having an appropriate length, the pipe is cut and opened, and a resin is injected from one end opening thereof. Lining is performed so as to flow and reach the other end opening, so that a coating film is formed up to the pipe end over the entire length of the working pipe, and after the lining, the working pipe is again brought into contact with the mating pipe. Connect and finish the repair.

[0005]

[0005] After the above-mentioned lining, when connecting to a counterpart pipe, a method of connecting pipe ends by welding through a relay pipe is adopted.
At this time, there were the following problems. When trying to connect a pipe with lining repair by welding, the lining coating is formed up to the inner surface of the pipe end, so the resin heats out due to the heat of welding, or burns and carbonizes and enters the gaps at the joints, causing metal This may hinder fusion between them, lower the welding strength, and leave fine holes and cracks in the weld. For this reason, conventionally, when a lining-repaired pipe and a connecting pipe to be connected to it are connected by welding, the lining coating on the inner surface of the pipe end is removed with a knife or a sambu (rotary grindstone), or the weld is padded. In particular, the work time was long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is intended for connecting a lining repair pipe capable of easily forming an uncoated portion having no lining coating at an end of the repair pipe. The purpose is to provide a jig.

[0007]

According to the present invention, in order to achieve the above object, a resin for lining is injected into a pipe from one end opening of a repair work pipe, and the resin is caused to flow toward an opening of the other end to make the pipe inner surface. A jig for connecting a lining repair pipe for forming a welding connection portion having no lining coating at the pipe end opening of the repair work pipe when forming the resin lining coating film on the connection pipe; The jig includes an insertion tube that is inserted into the pipe in contact with the inner surface of the pipe end opening of the repair pipe, an outer pipe that covers the outside of the pipe end opening, and a fixing that fixes the outer pipe to the repair pipe. And a resin recovery member connected to an end of the outer cylinder. In the case where the lining repair method is a resin plug flow method that needs to maintain a controlled pressure at the end of the pipe, a packing that seals the inner surface of the outer cylinder and the outer side of the repair pipe may be provided. desirable.

[0008]

According to the construction described above, the jig for connection of the present invention is fixed to the pipe end opening of the repair work pipe when the lining repair is performed on the laid pipe, and is removed after the lining repair is completed. Then, at the time of lining repair, since the insertion tube is inserted inside the tube end opening of the repair work tube, the resin adheres to the inner peripheral surface of the insertion tube on the inner surface of the tube end opening, and No coating film is formed on the inner peripheral surface. After completion of the lining repair, when the connecting jig is removed, the lining coating is separated at the inner end of the insertion tube and carried away with the insertion tube.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall schematic view of a lining repair device showing an example of a position where the connection jig 4 of the present invention is used,
One end of the repair pipe 2 is opened in the common manhole 1 installed below the road, and the other end is cut and opened at the entrance part which leads to the basement room of the building of the demand destination, and the resin 3 is injected from the common manhole 1 side. Is done. FIG. 1 shows a lining repair method using a resin plug flow method known per se,
To explain the outline of the operation, the pressure of the compressed air generated by the compressor 6 is first adjusted by the governor 8 through the electromagnetic switching valve 7, and the resin in the resin injector 10 is removed by the electromagnetic switching valve 9.
Is sent into the repair work pipe 2 by a predetermined amount. Next, the electromagnetic switching valve 7 introduces pressurized air into the flow rate control device 5, and the flow control device 5 initially extrudes a lump of lining resin, that is, a resin plug, with a relatively high pressure, and the resin plug forms a coating film. As it is used to reduce and extrude the resin plug while damping the pressure. The resin plug eventually reaches the end of the repair work pipe 2, passes through the connection jig 4, reaches the arrival confirmation pipe 12 as a resin recovery member, and the lining operation is completed. Reference numeral 11 denotes a drain valve for collecting excess resin, and reference numeral 13 denotes a shutoff valve for adjusting pressure at the tip of the resin plug. Reference numeral 2 'denotes a premises pipe extending into a building or a factory which was originally integrated with the repair work pipe 2.

FIG. 2 is an enlarged sectional view of the connection jig 4.
The connecting jig 4 includes an insertion tube 20 inserted into the inner surface of the end of the repair pipe 2, an outer cylinder 21 connected to the base 20 </ b> A and covering the outer surface of the end of the repair pipe 2, and an outer cylinder 21. And a fixing cylinder 22 coupled to the formed screw portion. In the case of the illustrated embodiment, the connecting jig 4 shows the insertion tube 20, the outer tube 22, and the fixing tube 22 formed as an integral structure. You may comprise so that it may separate and insert in the end part inner surface of the construction pipe 2 independently. In the case of the illustrated embodiment, the insertion tube 20 has a nipple 20B having a screw portion at its base 20A,
The ring 24 communicates with the resin reaching tube 12. The fixing tube 22 is provided with bolts 2 at several places at its end.
There is a nut hole to be screwed with 3, and the connection jig 4 can be fixed to the repair work pipe 2 by the bolt 23.
Further, on the inner surface of the fixing tube 22, a packing presser 25A,
There is a packing 24 such as an O-ring sandwiched between 25B,
The packing 24 is fixed by a packing presser 25C that engages with a tapered portion at the tip of the outer cylinder 21. The packing 24 prevents the resin from leaking to the outside and prevents air from flowing between the outer surface of the insertion tube 20 and the inner surface of the repair pipe 2. The resin does not enter even if it does not adhere to the surface.

FIG. 2 shows that the coating 3
0 indicates a state in which the inner surface of the repair work pipe 2 and the inner surface of the insertion tube 20 are provided. Here, when the lining repair is completed and the connection jig 4 is pulled out by loosening the bolt 23,
The lining coating 30 is torn off at the inner end of the insertion tube 20 and separated.
There is a portion where 0 is not formed. The length may be such that the lining coating does not exert the above-mentioned adverse effects during the welding operation, and about 20 cm was a suitable value experimentally.

FIG. 3 shows a repair work pipe 2 during lining work.
In the basement room of the building that will be the opening at the other end of the building, the repair pipe 2 is cut to provide an opening at the other end, and after the lining repair is performed, the pipe is again connected to another partner pipe via the relay pipe 26. FIG. First, in (A) and (B) of FIG.
Cut and remove the tube over a predetermined length to ensure the required working space. Next, in (C), the connecting jig 4 is set to the end of the repair work pipe 2 to perform lining repair. If necessary, the lining can be repaired at the end by setting it at the end of the local pipe 2 '. (D) is a view at the time when the lining repair has been completed, and a portion without a lining coating film is formed at the end of the repair pipe 2. (E) is a diagram in which the connecting relay pipe 26 is connected by welding.

[0013]

As described above, if the connecting jig of the present invention is used, an uncoated portion of the lining coating film can be formed at the pipe end opening of the lining repair work pipe.
When connecting the opening to the counterpart pipe after lining construction, when welding the relay pipe for connection and the pipe end opening,
There is no inconvenience that the resin enters the welded part to prevent fusion between metals, lowers the strength of welding, causes pinholes or cracks in the welded part, and removes the lining coating. Is unnecessary, so that it is not necessary to increase the so-called build-up during welding, so that effects such as facilitation of welding work can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall schematic view of a lining repair device showing a place where a connection jig is installed.

FIG. 2 is an enlarged sectional view of a connection jig.

FIG. 3 is a construction process diagram on the other end opening side of a laying pipe in which a connection jig is installed.

[Explanation of symbols]

 2 Repair pipe 3 Lining resin 4 Connection jig 20 Insert pipe 21 Outer pipe 22 Fixing pipe 26 Relay pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaki Natori 4-20-34, Honcho, Koganei-shi, Tokyo (72) Inventor Nobukatsu Ike 3-18-3 Daikan, Yamato-shi, Kanagawa Pref. Inside the research institute (72) Inventor Masahito Shinozaki 3-18-3 Daikan, Yamato-shi, Kanagawa Prefecture Inside the Hakko Development Technology Research Institute, Inc. (56) References: JP-A-56-59178 (JP, U) JP-A 52-100072 (JP) JP, U) Japanese Utility Model Showa 60-136778 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A lining resin is injected into the pipe from one end opening of the pipe, and the resin is flowed toward the other end opening to form a resin lining coating film on the pipe inner surface. A jig for connecting a lining repair pipe that forms a welded connection portion having no lining coating film at a pipe end opening of a pipe, wherein the connection jig is provided at a pipe end opening of the repair work pipe. An insertion cylinder that is inserted into the pipe in contact with the inner surface, an outer cylinder that covers the outside of the pipe end opening, and a fixing cylinder that fixes the outer cylinder to the repair work pipe, at an end of the outer cylinder. A jig for connecting a lining repair pipe, wherein the jig is connected to a resin recovery member.