JPH07109276B2 - How to connect steel belt parachute tow for pig - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel for pulling a pig for facilitating passage in a curved pipe portion and a pipe joint portion when passing a steel belt for pulling various pig devices for repairing an inner surface of a pipe. The present invention relates to a method of connecting a parachute to a belt.

[Prior art]

Conventionally, existing pipes such as gas pipes laid underground are
Since corrosion holes and cracks may occur in the pipe over time, which may cause a leakage phenomenon, for the purpose of repairing leakage or preventive maintenance, form a resin lining layer on the inner surface of the pipe as it is laid. Repairs are being made. When performing this pipe inner surface repairing method, insert a pig device that pushes the repair resin filled inside the pipe from the rear side from the pipe end, pull the pig device with a steel belt, etc., and move it. The gap between the outer circumference and the inner wall surface of the pipe is used as a lining space, and a repairing resin having a predetermined viscosity is discharged from this space to the rear side of the pig to form a resin lining layer having a predetermined thickness on the inner surface of the pipe. By the way, in the case of performing the above-mentioned pipe inner surface repair, the steel belt for pulling various pig devices must be preliminarily run through the pipe, and is called a "supply pipe" or "branch pipe" which is the pipe to be repaired. The existing pipe is divided into units of a predetermined length, and the steel belt wound in the belt storage case is passed through the pipe by using a parachute after the preliminary preparation before construction.

[Problems to be Solved by the Invention]

However, in the conventional steel belt wire passing method, as shown in FIG. 5, the parachute 03 is connected via the return 02 by the tip of the steel belt 01, and the parachute 03 is connected to the open end of the pipe to be repaired. After inserting from the insertion guide tube, the parachute 03 is moved by introducing high pressure air into the resin injection port portion installed in the insertion guide tube through the hose from the blower, and the steel belt 01 is passed through. However, as shown in FIGS. 6 and 7, if there is a bent pipe joint 04 and a curved pipe portion 05 in the middle of the existing pipe that is the repair target pipe, the parachute 03 due to the rigidity of the steel belt 01. There was a problem that the connection part with and was caught in the curved pipe part and could not be passed through. The present invention has been proposed to solve the above-mentioned problems, and when a steel belt for pulling various pig devices for pipe inner surface repair is parachuted, a pipe bent in the middle of the existing pipe for repair It is an object of the present invention to provide a steel belt parachute wire connecting method for pulling a pig which enables smooth wire passing without being caught in the bent tube portion even if there is a joint and the bent tube portion.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the parachute line connecting method according to the present invention, when the steel belt 11 for pulling various pig devices for pipe inner surface repair is passed through the existing pipe 1 which is the pipe to be repaired, the steel belt 11 In the wiring method in which the parachute 12 provided with the return 16 is connected by the connection portion with the above, the two tongue pieces 18 obtained by cutting the steel belt 11 into a predetermined length are provided to the rear of the return 16 from the above. The end of the tongue is crossed and connected in a link shape, and the universal part 17 in which the circular portion is arranged on the front side and the bowl-shaped guide 19 is attached to the rear part of the tongue piece 18 connected in this link shape is installed. It is configured.

[Action]

Based on the above configuration, according to the parachute wire connecting method of the present invention, two tongue pieces 18 obtained by cutting the steel belt 11 to a predetermined length cross the ends of the steel belt 11 to the rear of the return 16 further. Then, the universal part 17 having the bowl-shaped guide 19 with the circular portion arranged on the front side is installed on the rear part of the tongue piece 18 connected in the form of a link. Universal part with a bowl-shaped guide 19 attached even if there is a bent pipe joint or curved pipe part in the middle of the pipe
17, the steel belt 11 fits well, and there is no harmful effect such as the parachute 12 and the steel belt 11 being caught in the curved pipe portion, and smooth passage is achieved.

【Example】

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a partially broken essential part showing a method for passing a steel belt according to the present invention, and FIG. 2 is an enlarged view showing the essential part of a parachute through-passage connecting part according to the present invention. , Reference numeral 1 is an existing pipe to be repaired. The existing pipe 1 is a pipe which is usually called "main pipe" or "branch pipe", and is used for repairing to form a resin lining layer on the inner surface of the pipe. First, before performing repair work, as a preliminary preparation, the existing pipe 1 is divided into units of a length suitable for repair, and the separation opening ends 2 and 3 on both ends of the existing pipe 1 are made into vertical holes A and B opened on the ground. Each of them is exposed, and an insertion guide tube 4 is connected to one of the separation opening ends 2 and a lead-out guide tube 5 is connected to the other separation opening end 3. Further, the insertion guide tube 4 is provided with a resin injection port portion 7 having an opening / closing cock 6 in the pipe, and the resin injection port portion 7 is provided with a parachute wire before being filled with a repair lining resin. To do this, a hose 10 from a blower 9 driven by a generator 8 is connected. Further, the parachute 12 connected to the tip of the steel belt 11 for wire passage is inserted from the entrance of the insertion guide tube 4, and the rubber stopper 13 and the rubber stopper 14 are attached. The steel belt 11 is wound around the belt storage case 15, and is extended as the parachute 12 moves in the existing pipe 1. Further, a return 16 is provided at a connecting portion between the parachute 12 and the steel belt 11, and a universal portion 17 is formed behind the return 16 of the steel belt 11 so that the steel belt 11 is connected to the existing pipe 1. Even when passing through a bent pipe joint or curved pipe part, the wire is smoothly passed. As shown in FIG. 2, the universal portion 17 of the steel belt 11 has two tongue pieces 18 obtained by cutting the strip-shaped steel belt 11 into a predetermined length, and linking the tongue pieces 18 with the front and rear ends crossing each other. The outer diameter of the tongue piece 18 is substantially equal to the inner diameter of the existing pipe 1, the circular portion is arranged on the front side, and the bowl-shaped guide 19 is attached to the rear portion of the tongue piece 18. Further, the parachutes 12 for wire passage are formed of waterproof nylon base cloth, and when high pressure air from the blower 9 is blown from the rear of the parachutes 12 inserted from the inlet of the insertion guide tube 4, the parachutes in the tubes are parachuted. 12 opens, moves forward while maintaining airtightness with the inner wall surface of the pipe, and smoothly passes the steel belt 11 connected via the return 16 and the universal part 17 to the inside of the existing pipe 1 You can Therefore, after the steel belt 11 is passed through the parachute passing method configured as described above, the parachute 12 discharged from the lead-out guide pipe 5 of the existing pipe 1 is passed.
And the steel belt 11 is set on the winch 20 and a predetermined pig device, which is different depending on the construction content, is connected to the end of the steel belt 11 to repair the inner surface of the existing pipe 1. In addition, after the parachute passage is completed by the passage means, the hose from the blower 9 connected to the resin injection port 7 of the insertion guide tube 4 is removed, and the repair lining resin is removed from the resin supply tank (not shown). The resin injection hose to be injected is connected. Therefore, according to the parachute conduit connection method of the present invention, when the steel belt 11 for pulling the pipe inner surface repairing pig device or the like is parachuted through the pipe, the pipe joint 21 and the curved pipe portion bent in the middle of the existing pipe 1 are used. Even if there is 22, as shown in FIGS. 3 and 4, the universal portion 17 in which the bowl-shaped guide 19 is attached to the tongue piece 18 at the rear portion does not get caught in the curved pipe portion and the smooth wire passage is achieved. Is possible.

【The invention's effect】

As described in detail above, according to the method of connecting the steel belt parachute line for pulling the pig of the present invention, the steel belt 11 for pulling various pig devices for repairing the inner surface of the pipe is used.
When passing through the existing pipe 1 which is the repair target pipe,
Two tongue pieces 18 obtained by cutting the steel belt 11 to a predetermined length are connected to each other in a link shape with their front and rear ends crossed, and connected to this link shape, behind the retractor 16 installed on the parachute 12. Since the universal portion 17 having the bowl-shaped guide 19 with the circular portion arranged on the front side is installed on the rear portion of the tongue piece 18, the bent pipe joint 21 and the bent pipe portion 22 are provided in the middle of the existing pipe 1. Even if there is, the universal part 17 with the bowl-shaped guide 19 attached to the rear tongue piece 18 eliminates the problems such as the parachute 12 and the steel belt 11 being caught and making it impossible to pass the wire. Can run on the wire.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a partially broken essential part showing a method of passing a steel belt according to the present invention, and FIG. 2 is an enlarged view showing an essential part of a parachute through-wire connecting part according to the present invention, FIG. 3 and FIG. 4 is a cross-sectional view of a main part showing a state of a parachute line according to the present invention, FIG. 5 is a side view showing a conventional parachute line connecting portion, and FIGS. 6 and 7 show a state of a conventional parachute line. It is an explanatory view shown. 1 ... Existing piping, 2,3 ... Separation opening end, 4 ... Insertion guide tube, 5 ... Leading guide tube, 7 ... Resin injection port, 9 ... Blower, 11 ... Steel belt, 12 ... … Parachute, 16
...... Return, 17 …… Universal part, 18 …… Tongue, 19
…… Bowl-shaped guide, 20 …… Winch, 21 …… Pipe fitting, 21
…… The bending section.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kazuyasu Takeuchi, 4th, 3rd company, Hakko Development Technology Laboratory, 3-18 Daikan City, Yamato City, Kanagawa Prefecture (56) Reference JP-A-63-96390 (JP, A)

Claims (1)

[Claims] 1. An existing pipe (1) which is a pipe to be repaired with a steel belt (11) for pulling various pig devices for repairing the inner surface of the pipe.
When passing the wire through the inside, in the method of passing by using the parachute (12) provided with the return (16) by the connection part with the steel belt (11), the steel is placed behind the return (16) from the above. Belts (11)
Two tongue pieces (18) cut into a predetermined length are connected in a link shape with their ends crossed in the front and back, and the tongue piece (18) connected in the link shape is attached to the front side of the tongue piece (18). A method of connecting a steel belt parachute line for pulling a pig, characterized in that a universal part (17) having a circular portion arranged and a bowl-shaped guide (19) is installed.