JPS58217891A - Method of repairing gas pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing gas pipes buried in the ground, and more specifically, to repair defective locations that have already been detected, such as poor connections at joints, locations where cranks have occurred in the pipe body, etc. This article relates to a method for repairing gas pipes.

Hitherto, detection of defective locations in buried gas pipes has been carried out almost reliably using, for example, electromagnetic methods, and it is believed that there are no problems.

Methods for repairing gas pipes can be roughly divided into two methods: a method from outside the pipe and a method from within the pipe. (Aside from the method of replacing a pipe with a defective part with a new one.) In other words, in order to solve the problem from outside the pipe, an appropriate width is required depending on the length of a single defective part, the degree of separation between multiple defective parts, etc. This was done by excavating the soil underneath (for example, by wrapping a heat-shrinkable synthetic resin sheet around it), but this caused traffic congestion, noise, dirt, etc., not to mention the local residents. This was extremely undesirable as it caused a great deal of inconvenience to the general public. In addition, in order to avoid inconvenience to nearby residents and traffic, it is recommended to use open spaces while avoiding entrances, exits, and windows of residents, businesses, etc., or to widen the road width if there are no open spaces. Using a large area, the soil in two locations before and after the excavation was excavated over the desired area, and the gas pipe was cut out to a length of 1.5 to 2.5 meters to begin repair work as described below. .

Therefore, compared to the method of doing it from outside the pipe, the excavation area can be made much smaller, but due to the above-mentioned restrictions on the selection of the excavated part, the work inside the pipe may be longer than 100 meters in some cases. This made the workability worse. As for the repair method inside the pipe, a) a worker enters the pipe, uses a resin adhesive to attach a sealing rubber band, and then presses the outer surface of the rubber band with a retainer band. However, in this case, the diameter is limited to 60 cm or more, and the length of one section is limited to about 50 m, and safety measures for workers include life ropes, communication buzzers, and dustproof Masks, electric shock protectors, CO2, non-flammable CO concentration detectors, and other items are required, and there are various limitations and problems in terms of safety.

b) A reversal sealing method is adopted in which a resin adhesive is applied to the inner surface of the seal hose and a cold box is used to suppress its curing reaction. However, due to the initial cost and running cost of the equipment itself and the materials used, it was inevitable that the construction costs would be high.

C) Many other methods are known, such as the liquid-phase inner lining method, the foam seal method, and the insert method, but all of them have their advantages and disadvantages, and it is currently difficult to achieve full satisfaction.

The present invention was developed in order to eliminate the disadvantages of the conventional methods described above, and the purpose of the present invention is to repair not only large-diameter pipes but also small-diameter pipes, and where the pipe body to be repaired is unavoidable. To provide a method for repairing a gas pipe, which can be efficiently and reliably repaired even when the pipe is long, such as 80 to 100 m, and can therefore minimize the inconvenience caused to nearby residents and traffic.

Another object of the present invention is to provide a method for repairing gas pipes that can be done inexpensively and safely.

Next, an embodiment of the present invention capable of achieving the above object will be described in detail with reference to the accompanying drawings.

Figure 1 is an explanatory diagram of the construction method of the present invention, where A is a gas pipe buried in soil B, A1 is one section of the pipe to be repaired, and A
2 shows a pipe body that does not require repair, and in this example, the joint part A
3 are subject to repair. In addition, areas that require repair are
As mentioned above, exploration has been carried out using well-known techniques.

First, in order to cut and open both ends of one section of the gas pipe A to be repaired, the soil B before and after the one section is excavated to provide excavated holes B1 and B2.

Next, the rope drum C+ and the pressure air delivery and inlet pipes C2 and C3
, working device C with pressure air hose drum C4-C6
Then, a working device having a winch drum Ds is installed on the site, that is, a working device C is installed on the ground where the excavation hole Bl exists, and a working device is installed on the ground where the excavation hole B2 exists, and as described below. Repair work will begin using the repair runner E. In the figure, 1 and 2 are ropes, 3 and 4 are pressure air hoses, 5 and 6 are guide reels for ropes, and 7 is a plurality of guide reels for pressure air hoses.

The repair runner E is constructed as shown in FIGS. 2 and 3.

That is, in the same figure, reference numeral 8 denotes a pressure air pipe whose inside is partitioned by a longitudinal partition plate 9, thereby forming a first air chamber 10 and a second air chamber 11. A shield plate 13 having hose connection pipes 12a, 12b and a rope connection ring 12C is attached.

Reference numeral 14 denotes disks 14a and 14b fixed to the center in the longitudinal direction on the outer peripheral side of the pressure air pipe 8, and an airtight elastic body 14C (
A first air housing made of, for example, a rubber sheet is shown, and both sides of an airtight elastic body 14c are adhered to annular grooves formed on the opposing inner sides of discs 14a and 14b. Further, the inside of the first air housing 14 and the first air chamber IO are communicated through a through hole 8a formed in the pressure air pipe 8.

Reference numeral 15 denotes a second air housing that surrounds the left and right sides from the outer circumferential side of the first near housing 14 at desired intervals, and is composed of disks 15a, 15b and an airtight elastic body 15C, and the disks 15a, 15b are opposed to each other. Both sides of the airtight stretchable body 15C are adhered within the annular groove formed inside. Also second
The inside of the air housing 15 and the second air chamber 11 are communicated through a plurality of through holes 8b formed in the pressure air pipe 8.

Reference numeral 16 indicates a first repair adhesive sheet with a narrow width, and No. 17 indicates a second repair adhesive sheet with a thick width. For example, the material is a synthetic resin sheet, a synthetic resin sheet containing resin fibers, a rubber sheet, etc. A resin adhesive (eg, epoxy adhesive) is applied to the surface. A second repair adhesive sheet 17 (releasably wound around the outer periphery of the airtight elastic body 15C constituting the second air housing 15, and a first repair adhesive sheet 17 wrapped around the outer periphery of the second repair adhesive sheet 17 in a removable manner) Even if the adhesive sheet 16 is removably wound).

Reference numeral 18 indicates a plurality of pulleys provided at desired locations on the outside of both ends of the repair runner E (in the illustrated example, the pressure air pipe 8). And loaf.

The tip of the rope 1 is connected to the rope connection ring 12C, the tip of the rope 2 is connected to the rope connection ring 13a, the pressure air hose 3 is connected to the hose connection pipe 12a, and the pressure air hose 4 is connected to the hose connection pipe 12b. ing.

First, we explained the process of excavating the boreholes B+ and Bt, then installing the working devices C and D, and connecting the ropes 1 and 2 and pressure air hoses 3 and 4 to the corresponding locations, but below. The process is as follows.

The side repair runner E is attached to the repaired area (in the illustrated example, the joint part A
3) In the stationary state, first, pressurized air is introduced into the first air chamber 10 from the pressure air hose 3 through the hose connection pipe 12a as shown in FIG. In such a case, the pressurized air in the first air chamber 10 enters the first air housing 14 through the through hole 8a, and the airtight expandable body 14C expands in the outer circumferential direction.
According to this expansion, the central portion of the airtight expandable body 15 expands in the outer circumferential direction. As these expand, the narrow first repair adhesive sheet 16 is adhered to the entire inner circumference of the joint A3 via the central portion of the wide second repair adhesive sheet 17.

Next, as shown in FIG. 5, while pressure air is in the first air housing 14, pressure air is introduced into the second air chamber 11 from the pressure air hose 4 through the hose connection pipe 12b. In such a case, the pressurized air in the second air chamber 11 enters the second air housing through the through hole 8b, and the airtight expandable body 15c expands generally in the outer circumferential direction, and as a result of this expansion, a large amount of second repair is required. The adhesive sheet 17 is adhered to the inner circumferential wall of the tubular body A1 on the left and right sides of the first repair adhesive sheet 16 that was adhered first. When the above-mentioned adhesion is sufficiently performed, the pressure air in the first air housing 14 is first returned to the working device C via the pressure air hose 3 as shown in FIG. Pressurized air is returned to the working device C via the pressure air hose 4. Next, drive the winch drum D1 of the work equipment, and move the repair runner E to the pipe body A.
The repair work will be completed by raising it above ground from inside 2 through the excavation hole B1. Figure 7 shows pipe body A1 after repair.
In the figure, A3 is the joint part, and 16 is the narrow first part.
A second repair adhesive sheet 17 is shown as a repair adhesive sheet.

One embodiment of the present invention has been described above, but it goes without saying that parts other than the joint A3 may be repaired by the same means as described above, or the means in the process may be changed or the design Modified equipment may also be used.

(1) After the repair is completed, the repair runner E may not be pulled up to the ground via the excavation hole h2, but may be pulled up to the ground via the excavation hole B1 used when initially inserted into the pipe body Al. (Note: The working device C is equipped with a winch drum, and the repair runner is self-propelled.) By doing so, the area of the excavation shaft B2 can be reduced and the working device can be made unnecessary. (Note: It is sufficient to properly tie one end of the row 12.) (It) The pulley 18 of the repair runner E may be of a swivel type to accommodate the curved portion of the tube A1.

Since the present invention is constructed as described above, the pipe body to be repaired is not only a large diameter pipe but also a small diameter pipe, and the pipe body to be repaired is unavoidably 8
When the length is 0 to 100 meters, it can be repaired efficiently and reliably.Therefore, the inconvenience caused to nearby residents and pedestrians can be reduced as much as possible, and it can be done cheaply and safely. It has the following.

[Brief explanation of the drawing]

The drawings show an embodiment of the gas pipe repair method according to the present invention, in which Fig. 1 is an overall explanatory view, Fig. 2 is a longitudinal cross-sectional side view of an example of the pipe body to be repaired and a repair runner, and Fig. 3 is a left side view of the same as above, FIGS. 4 to 6 are longitudinal side views of a part of the repair runner during other processes, and FIG. 7 is a longitudinal side view of a portion of the repair runner after the repair is completed. A+ ・・・Pipe B in one section to be repaired
... Soil Bl, B2 ... Excavation pit E ... Repair runner 8 ... Pressure air pipes 8a, 8b ... Through hole 10. ...First air chamber 11...Second air chamber 14...First air housing 14c...Airtight expandable body 15...Second Air housing 15a... Airtight elastic body 16... Narrow first repair tape 3 2 17... Wide second repair adhesive tape 18...
...Pulley patent applicant 11) Kozokai
Onishikuni Shiima Iyohisa Toshihiko Watanabe Kamenosuke 4

Claims (1)

[Scope of Claims] (11) A first air housing having an airtight expandable body on the outer periphery is provided at the center in the longitudinal direction of a pressure air pipe configured airtight under a desired length and a desired diameter; A second air housing having an airtight elastic body is provided around the outer periphery of the air housing, surrounding the left and right sides of the air housing, and a second repair adhesive having a resin adhesive applied to the surface is further attached to the outer periphery of the second air housing. releasably winding the sheet, and removably rolling a first repair adhesive sheet, the surface of which is coated with a resin adhesive, around the center of the outer periphery of the second repair adhesive sheet;
In addition, the first air housing and the second air housing can be vented separately from the pressure air pipe, and a repair runner with a pulley for running inside the pipe is used to first remove the buried gas pipe. An excavation pit is provided in the soil at both ends of one section to be repaired, both ends of the pipe body in the one section are cut open, and a repair runner is moved from one of the excavation pits to the repair point in the pipe body, Pressurized air is inserted into the first air housing through the pressure air pipe to inflate the airtight elastic body of the first air housing, and this expansion expands the central portion of the airtight elastic body of the second air housing. The first repair sheet is bonded to the repaired part of the pipe body through the center part of the second repair adhesive sheet by the expansion of these adhesive sheets, and then, in this state, the second repair sheet is attached to the second air housing via the pressurized air pipe. By sending pressurized air into the second air housing, the second repair adhesive sheet is replaced with the first one.
A gas pipe repair method characterized by adhering a repair adhesive sheet to the left and right pipe bodies, and finally pulling out a repair runner into the pipe body to complete the entire process. (2) A first air chamber and a second air chamber are formed in the pressure air pipe, and the first air chamber is connected to the first air housing, and the second air chamber is connected to the second air housing through separate through holes. (3) The gas pipe repair method according to claim 11 is characterized in that the method is achieved by using a repair runner that communicates with the repair runner. A method for repairing a gas pipe according to claim +11. (4) Claim +11 characterized in that the repair method is performed using a repair runner in which the pulley running inside the pipe is a swivel type.
The gas pipe repair method described.