JPH09229233A - Lining method for inner wall of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily repair the lining of a pipe with a simple device disposed at both ends of the pipe to be repaired, by passing a pulling wire and a pair of pigs through which the pulling wire is passed through the pipe to be repaired and by holding adhesive resin paint C for lining in the middle of the pigs and moving them in the pipe. SOLUTION: Pigs 1, 1' passed by a pig holding wire 5 are movably held by pulling devices 3, 3' connected to a pulling wire W and retaining plates 4, 4'. Viscous resin paint C for lining is filled in the middle part of the pigs 1, 1' and the pigs with paint C therebetween is moved by pulling outside the pulling wire W from the end of the pipe, whereby the backward pig 1' is pushed by the retaining plate 4' and the pushed viscous resin paint C is applied on the inner wall surface of the pipe D in a uniform thickness. If the viscous resin paint C is not well applied at the bending part of the pipe only by a single movement of the pig device P, the pig device P is moved back and the viscous resin paint C may be double applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a defect generated in an underground buried pipe or the like without carrying out a large-scale work such as excavation from the ground, and particularly to a resin coating or the like on the inner wall of the defective pipe. The present invention relates to an improvement in a method for lining an inner wall of a pipe, which repairs the pipe by applying

[0002]

2. Description of the Related Art Underground buried pipes such as sewer pipes are prone to cracks due to uneven soil pressure, and are sometimes broken. In addition, depending on the material of the underground buried pipe, the drainage flowing inside may cause corrosion and cause water leakage. In order to repair such a defect in the underground buried pipe, a method of digging from the ground to repair the damaged portion and then backfilling it has been conventionally performed. However, this method requires a lot of man-hours and costs, so as a method of repairing from inside the pipe without digging the ground, a method of injecting a coagulant agent into the ground from the inside of the pipe through the defective part, thermosetting Of a flexible synthetic resin tube into the tube and crimping it to the inner surface, followed by heat curing to form a resin lining, or by applying a lining material such as synthetic resin paint to the inner surface of the tube and curing it Various construction methods such as a method of forming a lining have been proposed.

If the pipe to be repaired is a large-diameter pipe such as a sewer main pipe, it is easy to introduce a large-scale repair device or a long material. An appropriate repairing method can be selected depending on the situation.
However, it is often difficult to secure a space for introducing equipment for small-diameter pipes that branch from the main pipe, so it is economical to repair pipe defects such as corrosion without digging up the earth and sand. Considering the above aspect, there was no suitable method other than the method of lining the inner wall of the pipe with a pig.

In such a piglining method, a pig injection device is attached to one end of a pipe to be repaired so that pressurized air can be supplied to the pipe, and a compressible material having an outer diameter slightly smaller than the inner diameter of the pipe is used. The preceding pig, the resin coating for lining, and the lining pig are sequentially loaded into the injection device, and the coating and the pig are injected into the pipe by pressurized air to apply the lining coating evenly on the pipe inner wall surface. It is a method of collecting the pig that jumps out from the other end of the pipe. However, such a piglining method has a drawback that a portion of the pipe which is not covered with the coating material for the lining is likely to remain in the shaded portion of the bent portion of the pipe. Therefore, the pig is further run from the opposite direction to perform double coating. Then, the coating material for the lining was surely applied.

[0005]

However, in the conventional piglining method, it is necessary to install an air compressor or the like on at least one end of the lining construction section, and there is a working space at both ends of each construction section. This method cannot be used unless it can be secured. Furthermore,
If there is a defect that causes air leakage in the middle of the pipe to be constructed, there is a drawback that the promotion of the pig stops and it becomes clogged. Further, there is also a problem that it takes time to perform a preparatory work such as mounting a pig injection device or the like on the end of the lining section, and it is not possible to improve the construction efficiency.

[0006] In addition, when the conventional piglining method is applied to a mounting pipe for dropping sewage or the like generated in each household to the main pipe, a pig injection device is installed at the end of the mounting pipe on the main pipe side. It is not possible to mount it, and the pig that has fallen into the main pipe cannot be returned to the mounting pipe.
Therefore, it was also impossible to reciprocate the pig to obtain a lining free from defects by double coating of the lining paint.

Therefore, the present invention eliminates the above-mentioned drawbacks of the conventional piglining method and can be easily installed even if there is a restriction such as a small working space, and a bent portion or an air leak may occur in the middle of the pipe. Even if there is such a problem, the object was to provide a pipe inner wall lining method with high work efficiency, in which a complete lining finish can be expected using a pig.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
The step of passing the tow line through the pipe to be repaired, one set of pigs are sequentially inserted through the through hole of the axial center so as to be movable, and the through holes are provided at the front and rear positions of the one set of pigs. A step of connecting the tow cable to a front portion of a pig device in which a pair of locking plates that can be closed are provided so as not to fall off, and a step of holding a viscous resin paint for lining in the middle of the pair of pigs. And a step of applying the viscous resin paint to the inner wall surface of the pipe by pulling the tow line and moving the pig device along the pipe, and a step of curing the viscous resin paint. This is achieved by the method of lining the inner wall of the tube.

In addition to the steps described above, a step of extending a sub-traction line to the rear portion of the pig apparatus is added, and after the step of applying viscous resin paint to the inner wall surface of the pipe, the sub-traction line is pulled to pull the pig. A more complete and defect-free repair can be performed by adding a step of applying the viscous resin coating on the inner wall surface of the pipe by moving the device backward along the pipe.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION When the pipe inner wall lining method of the present invention is applied to a water leak repair work for drainage pipes, a pig apparatus P as shown in FIG. 1 is used. That is, 2
The individual pigs 1, 1 ′ are made of a substantially columnar compressible synthetic resin molded body having an outer diameter which is substantially equal to or slightly smaller than the inner diameter of the pipe D to be repaired, and its surface is preferable. A rubber-like cover or the like is attached to the shaft, and through holes 2 and 2'are provided at the axial positions thereof. These pigs 1, 1'are inserted through the pig holding wire 5,
At both ends of the pig holding wire 5, a tractor 3 and a locking plate 4 that can be connected to the tow line W, and a tractor 3'and a locking plate 4'that can be connected to the auxiliary tow line W'are attached. , The pigs 1, 1'are held so as not to fall off from the pig holding wire 5 and to be movable. A protective tube or the like may be inserted into the through holes 2 and 2 ′ so that they can be easily moved along the pig holding wire 5 and that the through holes 2 and 2 ′ do not expand due to wear. preferable.

The pig-holding wire 5 may be an independent member, but may be formed of a part of the above-mentioned tow line W or sub-tow line W '. The W ′ and the pig holding wire 5 may be a part of each of the integral tow lines W. When the pig-holding wire 5 is a part of the tow rope W, the pullers 3 and 3 ′ can be connected to each other by tightening or the like so as not to cause a longitudinal displacement with respect to the tow rope W. Good. When the pig holding wire 5 is a separate member from the tow line W or the auxiliary tow line W ', the tractor 3 or 3'is the tow line W or the tow line W'.
It is necessary to be able to surely bond the end portion with the same strength as its tensile strength.

Further, the locking plates 4, 4 ′ attached to both ends of the pig holding wire 5 are for locking the pigs 1, 1 ′ so as not to come off from both ends of the pig holding wire 5, and the pigs 1, 2. This is for closing the gap between the through holes 2 and 2'provided in 1'and the pig holding wire 5 so that the viscous resin coating material C does not unnecessarily flow out. If such an action can be expected, It may be movable along the pig holding wire 5, and need not necessarily be fixed to the end of the pig holding wire 5. The distance between the locking plates 4 and 4'is
It is sufficient that the space required to hold a sufficient amount of the viscous resin coating material C to be applied to the inner wall surface of 2 is formed between the two pigs 1 and 1 '.

In the present invention, as the viscous resin paint C applied to the inner wall of the pipe to repair the damaged portion, a known epoxy resin lining resin paint or the like used in the conventional piglining method is used. However, it is important to select one that can be held in a filled state between the pigs 1, 1'and has a viscosity suitable for application to the inner wall of the tube.

In order to apply the lining to the inner wall of the pipe by using such a pig apparatus P, first, the inside of the pipe D to be repaired is cleaned, and the pig is moved in the pipe by grinding as necessary. Flatten it so that it does not interfere. Then, the tow line W is passed through the pipe D, for example, by using a wire.
Then, the tractor 3 at the front of the pig device is connected to the tractor W exposed from one end of the pipe, and if necessary, one end of the auxiliary tractor W'is connected to the tractor 3'at the rear of the pig device. Join.

After the preparation as described above, the viscous resin coating material C for lining is charged in the middle of a pair of pigs of the pig apparatus,
The tow line W exposed to the outside is pulled from the other end of the pipe to move the pig apparatus along the pipe D. In this way, the pig 1 in front of the traveling direction resists movement due to friction with the inner wall of the pipe, but the pig 1'in the rear is pushed by the locking plate 4'and pressure is applied to the viscous resin paint C. The viscous resin paint C extruded to the outside is applied to the inner wall surface of the pipe D by the pig 1'in a substantially uniform thickness.

In this way, the lining is applied to the inner surface of the pipe D, but with this alone, the viscous resin paint C is applied to the bent portion of the pipe.
It can happen that is not widespread. In order to prevent the occurrence of such a defect, the pig apparatus P that has reached the other end of the pipe D
It is possible to adopt a method in which the sub tow line W'is pulled to move backward in the pipe D, and the viscous resin coating material C is applied over the inner wall surface of the pipe. In this way, after forming a coating film having no defects, the coating film is cured to complete the lining of the inner wall of the pipe.

A procedure for applying the pipe inner wall lining method of the present invention when repairing a mounting pipe for flowing domestic wastewater into the main sewer will be described. As shown in Figure 2,
If the mounting pipe 7 connected to the sewer main 6 is damaged,
First, each inflow pipe is blocked so that it does not flow into the drainage basin 8 upstream of the mounting pipe 7 to be repaired, so that the drainage water is bypassed, and then the manhole on the upstream side of the sewer main 6 to which the mounting pipe 7 is connected. By installing a weir etc. in such a place and diverting it so that sewage does not flow into the planned construction area, a TV camera for repair work monitoring, tools and materials etc. are carried into the sewer main 6 as necessary or Prepare a sled for carrying out, and also a work robot and so on.

Next, a tow line 9 is provided between the manhole 6a immediately upstream of the sewer main 6 and the manhole 6b immediately downstream thereof.
The leading end portion 9a of the tow line 9 is fixed to the manhole 6a side, and the rear end portion 9b of the tow line 9 is connected to the manhole 6b.
Withdraw from Then, the tow line 9 passed through the sewer main 6
The rear end 9b is connected to a winch or the like provided on the ground so that the can be pulled out. Then, a wire is inserted from the drainage box 8 through the inside of the mounting pipe 7, and the sewer main 6
The tow line 9 passing through the inside is hooked, and the middle portion of the tow line 9 is pulled up to the drainage box 8 via the mounting pipe 7. Then, the front half of the tow line 9 reaches the drainage box 8 from the manhole 6a through the upstream portion of the sewer main 6 and the inside of the mounting pipe 7.
Here, the rear half of the tow line 9 folded back passes through the inside of the attachment pipe 7 again, reaches the winch or the like through the downstream portion of the sewer main 6 and the manhole 6b.

After this state is reached, the front part of the pig apparatus P'provided at the tip of the auxiliary tow line 9'having the rear end coupled to the winch provided on the ground is exposed from the drainage box 8. It is connected to the intermediate folded portion of the rope 9. The viscous resin paint is applied to the inner wall surface of the mounting pipe 7. The pig apparatus P ′ is different from the pig apparatus P ′ in that the tractor 3 ″ coupled to the tow line 9 incorporates a pulley or the like, and the portion of the tow line 9 that is folded back can be hung. It has a structure essentially similar to that of the pig apparatus P shown in FIG.

Then, when the rear end portion 9b of the tow line is pulled by a winch or the like, the pig apparatus P'is pulled while pulling in the auxiliary tow line 9'and advances from the drainage basin 8 through the inside of the mounting pipe 7 to the mounting pipe 7 '. Sewage main 6 while applying viscous resin paint C on the inner wall surface of the
Reach Therefore, this time, the tow cable 9 is removed, or the auxiliary tow cable 9'is pulled while loosening without removing the tow cable 9'to retract the pig apparatus P'to the drainage box 8 and simultaneously apply the viscous resin paint C twice. Then, if necessary, further viscous resin paint C
Is repeatedly applied to cure the viscous resin coating material C applied to the inner wall surface of the mounting pipe 7 without any defects, thereby completing the lining of the inner wall of the pipe.

[0021]

According to the pipe inner wall lining method of the present invention, repair work can be carried out simply by providing simple equipment at both ends of the pipe to be repaired. And, even if the space for installing the air compression device is insufficient, or if the piglining method cannot be applied due to air leakage that makes it difficult to pressurize the air, it is possible to perform graining without any restrictions. Since the preparation work is simple, it is possible to significantly reduce the preparation time. In addition, the coating speed of the coating material for lining can be set arbitrarily, and multiple coating is extremely easy, so that a lining without defects can be obtained in a short time. Further, unlike the conventional piglining method, there is no defect that the parts other than the repaired part are contaminated by the lining paint, and there is an advantage that the work efficiency is high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a pig device used in a pipe inner wall lining method of the present invention.

FIG. 2 is a conceptual diagram for explaining a working state of the pipe inner wall lining method of the present invention.

[Explanation of symbols]

 P, P'Pig device W Traction line W'Subtractor line C Viscous resin paint D Pipe 1, 1'Pig 2, 2'Through hole 3, 3'Tractor 4, 4'Locking plate 5 Pig holding wire 6 Sewage Main pipe 6a, 6b Manhole 7 Mounting pipe 8 Drainage basin 9 Traction line 9a Tip 9b Rear end 9'Sub-traction line

Claims (4)

[Claims] 1. A step of passing a tow line through a pipe to be repaired, a set of pigs being sequentially movably inserted through a through hole of an axial center, and positions before and after the set of pigs. A step of connecting the tow cable to the front part of a pig device in which a set of locking plates capable of closing the through hole is provided so as not to fall off, and a viscous resin paint for lining in the middle of the set of pigs. And a step of applying the viscous resin paint to the inner wall surface of the pipe by pulling the tow line to move the pig device along the pipe, and a step of curing the viscous resin paint. A method for lining the inner wall of a pipe, characterized by: 2. A step of passing a tow line through a pipe to be repaired, a set of pigs being sequentially movably penetrated by a through hole of an axial center, and positions before and after the set of pigs. A step of connecting the tow line to a front portion of a pig device in which a set of locking plates capable of closing the through hole is fixedly provided, and a step of extending a sub-tow line to the rear portion of the pig device. And a step of holding the viscous resin paint for lining in the middle of the pair of pigs, and applying the viscous resin paint to the inner wall surface of the pipe by pulling the tow line to move the pig device along the pipe. A step, a step of pulling the auxiliary tow line and moving the pig device backward along the pipe to apply the viscous resin paint on the inner wall surface of the pipe, and a step of curing the viscous resin paint. A method for lining an inner wall of a pipe, comprising: 3. A step of passing a tow line to a main pipe between a pair of manholes, and a step of attaching the middle part of the tow line by a pulling line inserted from an outer opening of an attachment pipe connected to the main pipe. A step of leading out to the outer opening of the pipe, a set of pigs being sequentially movably inserted through axial through holes, and the through holes can be closed at positions before and after the one set of pigs. A step of connecting an intermediate portion of the tow line to a front portion of a pig device in which a pair of locking plates is provided so as not to fall off, and a step of holding a viscous resin paint for lining in the middle of the pair of pigs, Applying the viscous resin paint to the inner wall surface of the mounting pipe by pulling the tow line from at least one side of the manhole and moving the pair of pigs along the mounting pipe; and curing the viscous resin paint. And a step of causing the inner wall of the tube to be lined. 4. A step of passing a tow line through a main pipe between a pair of manholes, and a step of attaching the middle part of the tow line by a pulling line inserted from an outer opening of an attachment pipe connected to the main pipe. A step of leading out to the outer opening of the pipe, a set of pigs being sequentially movably inserted through axial through holes, and the through holes can be closed at positions before and after the one set of pigs. A step of connecting the middle part of the tow line to the front part of the pig device in which a pair of locking plates are provided so as not to fall off, a step of extending the auxiliary tow line to the rear part of the pig device, and A step of holding a viscous resin paint for lining in the middle of the pig, and a step of pulling the tow line from at least one side of the manhole to move the pair of pigs along the attachment tube to the inner wall surface of the attachment tube. In addition to the process of applying the viscous resin paint and the auxiliary tow rope that is left in the outer opening of the mounting pipe, A step of pulling the end and moving the pair of pigs in the opposite direction along the mounting tube to apply the viscous resin coating material on the inner wall surface of the mounting tube, and a step of curing the viscous resin coating material. A method for lining the inner wall of a pipe, characterized by: