JPH1061870A - Pig for insertion in pipe and traction method for pig for insertion in pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pig for insertion in a pipe and a traction method for the pig for insertion in a pipe to simply prevent the occurrence of a hook to the interior of a piping and improve working efficiency and reduce a work executing cost. SOLUTION: First and second coupling parts 6a and 6b to differently mount first and second rigging 2 and 3 to pull a pipe in the same direction are arranged in the positions separated away from each other of a body surface part 1a. Further, when, in a piping, hooking is caused to occur during traction by the first rigging 2 for traction or both the first and second rigging 2 and 3, traction operation is suspended. By pulling the second rigging 3 for traction, the direction of the first coupling part 6a is changed and after hooking is released, initial traction operation is restarted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-tube insertion pig provided with a towing cord, and a method of towing the in-tube insertion pig.

[0002]

2. Description of the Related Art Heretofore, this type of pig for insertion into a tube has only one towing cord which can be pulled in the same direction.

[0003]

In the case where the above-mentioned conventional in-tube insertion pig is towed forward by a single towing cord, a mounting portion for attaching the towing rope to the in-tube insertion pig protrudes outside. In such a case, there is a problem that the attachment portion is caught by a bent portion or the like in the pipe, and the forward traction is suppressed. If the in-tube insertion pig is provided with another retraction rigging for retraction, retreat the in-tube insertion pig with the retraction traction cord, and again with the forward traction rig. I had to pull forward again. In addition, even if the vehicle is towed forward again, the vehicle may be caught at the same place, and the same forward and backward operation must be repeated many times. For example, in the work of pulling the pipe inner surface lining pig as a pipe insertion pig, applying a lining material to the pipe inner surface, and repairing the existing pipe, as described above, the pig is caught in the middle of the pipe, and However, since it is necessary to repeat the same forward and backward operations, it takes time and effort, and it is difficult to improve work efficiency and reduce construction costs. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to easily avoid a snag in a pipe, and to improve a work efficiency and reduce a construction cost. The point is to provide a method.

[0004]

The first feature of the pipe insertion pig according to the present invention for achieving this object is as described in claim 1 of the claims. Referring to FIG. 1 and FIG.
a, a first connecting portion 6a and a second connecting portion 6b to which a first towing cord 2 and a second towing cord 3 that can be towed in the same direction in the pipe are separately attached. On the point.

[0005] The second characteristic configuration is as described in claim 4 of the claims, and FIG. 3 and FIG.
In consideration of the above, the first towing cord 2 and the third towing cord 8 that can be towed in the pipe in opposite directions are separately attached to the main body surface 1a at positions separated from each other. At least one fourth towing cord 9 having a connecting part 6a and a third connecting part 6c and capable of towing the inside of the pipe in the same direction as the first towing cord 2 is attached to the third connecting part 6c. On the point.

A first characteristic configuration of a method of pulling an in-tube insertion pig according to the present invention for achieving this object is as described in claim 2 of the claims, and FIG. 2 and FIG. 2, when the pig according to the first characteristic configuration of the in-pipe insertion pig is caught in the pipe while being towed by the first towable cord 2, the first towage rope is inserted. After the towing operation by the tool 2 is interrupted, the second towing cord 3 is pulled, the direction of the first connecting portion 6a is changed, and the hook is released. The point is to resume towing.

The second characteristic configuration is as described in claim 3 in the claims section.
In consideration of the above, the pig according to the first characteristic configuration of the pig for pipe insertion was caught in the pipe during towing by both the first towing rope 2 and the second towing rope 3. In some cases, the first towing cord 2 and the second towing cord 3
, And the one of the first or second towing cord 2 or 3 is pulled to change the direction of the first connecting portion 6a or the second connecting portion 6b, The point is that after releasing the hooking, the towing by both the first towing cord 2 and the second towing cord 3 is restarted.

[0008] The third characteristic configuration is as described in claim 5 in the claims section.
When the pig according to the second characteristic configuration of the in-pipe insertion pig is caught during towing by the first towing cord 2 in the pipe, the first towing cord 2 is used. The towing operation is interrupted, the fourth towing cord 9 is pulled, the direction of the first connecting portion 6a is changed, and the hook is released, and then the towing by the first towing cord 2 is resumed. Is to do.

In the above description of the characteristic structure of the pig for insertion into a pipe and the method of pulling the pig for insertion into a pipe according to the present invention, reference numerals are written for convenience of comparison with the drawings. It is not limited to the configuration of the attached drawings.

The operation will be described below. According to the first or second characteristic configuration of the in-pipe insertion pig according to the present invention, since at least two or more towing cords that can be pulled in the forward direction are provided, when the catch occurs, By towing at least one of the, the posture of the pipe insertion pig can be changed, so that the hook can be easily released, as a result,
Work efficiency can be improved and construction costs can be reduced. In particular, according to the second characteristic configuration, since the retraction towing cord is provided, the towing rope used for releasing the hook and the retraction towing rope are appropriately combined and operated. Therefore, even if the catch is complicated, the catch can be easily released. In addition, it is generally assumed that the catch is often generated at a connecting portion for attaching the towing rope to the in-tube insertion pig, but in that case, the towing is performed by two or more of the towing ropes. In this case, one of the towing cords is restrained from being towed, and the towing is automatically continued with the remaining towing cords. The rotation moment about the center acts and the catch can be automatically released.

According to the first to third aspects of the method of pulling an in-pipe insertion pig according to the present invention, the hook can be easily removed when the corresponding in-pipe insertion pig is towed while the corresponding in-pipe insertion pig is towed. It can be released, and the pipe insertion work can be performed efficiently in a short time, and as a result, the construction cost can be reduced.

[0012]

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

FIG. 1 shows a pig for insertion into a pipe according to the present invention.
It is a block diagram which shows embodiment at the time of applying to the pig for pipe inner surface lining used for repair of the inner wall surface of existing piping etc.
As shown in FIG. 1, the pig body 1 has an outlet opening end 4c.
Are provided, and the first towing cord 2 and the second towing cord 3 are inserted into each of the through holes 4. Further, a metal retaining member 5 is provided near both ends of the through holes 4 of the tow ropes 2 and 3 so that the tow ropes 2 and 3 do not fall out of the through holes 4.
(A crimp terminal used for connection of electric wiring can be used.) Although each of the towing cords 2, 3 and the pig body 1 are not directly connected, the inner diameters of the two inlet opening ends 4a, 4b and the outlet opening end 4c of each of the through holes 4 are such that the inner diameters of the through holes 4 do not fall. Smaller than the width of the member 5, the retaining member 5 is locked at both ends of the through holes 4, and the towing cords 2, 3 are substantially connected to the pig body 1; The entrance opening ends 4a and 4b spaced apart from each other on the main body surface 1a form a first connecting portion 6a and a second connecting portion 6b to which the respective towing cords 2 and 3 are attached. The pig body 1 is a sphere having an appropriate diameter corresponding to the inner diameter of the pipe to be inserted, that is, the pipe to be lined and the thickness of the lining.

As shown in FIG. 2, the pig for lining the inner surface of the pipe is pulled by the first towing cord 2 or both the first towing cord 2 and the second towing cord 3, and the inner wall of the pipe is pulled. While moving in the pipe while applying the lining material 13 to the connecting portion 12 between the straight pipe 10 and the bent joint pipe 11 at the bent portion in the pipe, the first connection portion 6a or the stopper in the vicinity thereof is prevented. By temporarily suspending the towing operation from the state where the member 5 is hooked, and pulling the second towing cord 3,
The posture of the pig body 1 is changed to release the hooked state.

Hereinafter, another embodiment will be described. The pig for insertion into a pipe according to the present invention shown in FIG. 1 may be configured as shown in FIG. As shown in FIG. 3, the pig body 1 has a space between an inlet opening end 7a and an outlet opening end 7c.
A plurality of through holes 7 are provided, and the first towing cord 2 is inserted into the through holes 7, and is opposite to the first towing cord 2 from the outlet opening end 7 c to the outside. A third tow cord 8 that can be towed in the direction is formed. Further, the first and third towing cords 2 and 8 are prevented from falling out of the through holes 7 and two fourth towings that can be towed in the same direction as the first towing cord 2. In order to connect the rigging device 9 to the pig body 1 at the outlet opening end portion 7c side, the retaining member 5 includes a portion immediately adjacent to the entrance opening end portion 7a of the first towing rigging device 2; Exit opening end 7c
In the immediate vicinity, the third towing cord 8 and one end of each of the two fourth towing cords 9 are bundled and attached by crimping. The first, third and fourth towing cords 2, 8, 9 and the pig body 1 are not directly connected, but the inlet opening end 7a and the outlet opening end 7c of the through hole 7 are not connected. The inner diameter is smaller than the width of the retaining member 5, the retaining member 5 is locked at both ends of the through hole 7, and each of the towing cords 2, 8, 9 is connected to the pig body 1.
The inlet opening end 7a and the outlet opening end 7c spaced apart from each other on the main body surface 1a, and a first connecting portion 6a for attaching the first towing cord 2; A third connecting portion 6c for attaching the third and fourth towing cords 8, 9 is formed.

As shown in FIG. 4, the pig for lining the inner surface of the pipe is pulled by the first towing cord 2, and while moving in the pipe while applying the lining material 13 to the inner wall of the pipe, In the bent portion, the towing operation is temporarily suspended from the state where the first connecting portion 6a or the retaining member 5 in the vicinity thereof is hooked on the connecting portion 12 between the straight pipe 10 and the bent joint tube 11, and the fourth towing is performed. By pulling one or both of the ropes 9, the pig body 1 is changed in posture and released from the hooked state. At the same time, the third towing cord 8 may be operated as an auxiliary operation.

The pig for insertion into a pipe shown in this embodiment is not limited to the pipe lining, but may be used for cleaning or inspection of the pipe. Further, the shape of the pig body 1 may be a single sphere, a shell shape, or any other suitable shape, and two or more of them may be connected.

The method of attaching the towing cords 2, 3, 8, 9 to the pig body 1 is as follows.
Reference numerals b and 6c denote connecting members directly attached to the pig body 1, and one ends of the towing cords 2, 3, 8, and 9 may be connected to the connecting members.

Each of the towing cords 2, 3, 8, and 9 may be any type such as a rope, a wire, and a chain, and the number thereof is not limited to the number shown in the present embodiment. One or two or more of them may be independent of each other. .

[0020]

As described above, according to the present invention,
It is possible to provide a pig for in-pipe insertion and a method for pulling the in-pipe insertion pig, which can easily avoid catching in a pipe, improve work efficiency and reduce construction cost.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a pig for insertion into a pipe according to the present invention.

FIG. 2 is a side sectional view for explaining a method for towing a pig for insertion into a pipe according to the present invention.

FIG. 3 is a side view showing another embodiment of the pig for insertion into a pipe according to the present invention.

FIG. 4 is a cross-sectional side view illustrating a method of pulling a pig for insertion into a pipe according to the present invention.

[Explanation of symbols]

 1a Body surface part 2 First towing cord 3 Second towing cord 6a First connecting part 6b Second connecting part 6c Third connecting part 8 Third towing cord 9 Fourth towing cord

Claims (5)

[Claims] 1. A first connecting portion and a second connecting portion in which a first towing cord and a second towing cord which can be towed in the same direction in a pipe are separately attached at positions separated from each other on a main body surface portion. A pig for insertion into a tube provided with. 2. When the in-pipe insertion pig according to claim 1 is caught during towing by the first towing cord in a pipe, the towing operation by the first towing cord is interrupted,
A method for pulling an in-pipe insertion pig that pulls the second tow cord to change the direction of the first connecting portion to release the hook, and then resumes towing by the first tow cord. 3. The first towing method according to claim 1, wherein the in-pipe insertion pig according to claim 1 is caught in the pipe during towing by both the first towing cord and the second towing cord. The towing operation by both the cord and the second towing cord is interrupted, and one of the first and second towing cords is pulled, and the direction of the first connecting portion or the second connecting portion is changed. , And after releasing the catch, the method of towing the intra-tube insertion pig that resumes the towing by both the first towing cord and the second towing cord. 4. A first towing cord and a third towable rope which can be pulled in opposite directions in a pipe at positions spaced apart from each other on the surface of the main body.
A fourth towing cord which is provided with a first connecting part and a third connecting part to which towing cords are separately attached, and which can be pulled in the same direction as the first towing cord in the pipe, is connected to the third connecting part. At least one pig for insertion through the tube. 5. When the pig for pipe insertion according to claim 4 is caught in the pipe during towing by the first towing cord, the towing operation by the first towing cord is interrupted,
A method for pulling an in-pipe insertion pig that pulls the fourth towing cord to change the direction of the first connecting portion to release the hook, and then resumes towing by the first towing cord.