JP3264906B2 - Rehabilitation repair method for existing pipeline - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating and repairing an existing pipeline such as a gas pipe, in particular, a resin pipe lining of a main pipe and a branch pipe using a curved pipe at the same time.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed for a technique for rehabilitating and repairing by excavation while existing pipes are laid. For example, recently, a resin lining method of an existing pipeline using a non-drilling technique has been used. At present, this method has already been recognized as an effective repair technique for aging existing pipelines.

As a lining method as described above, the present applicant has proposed a rehabilitation repair method as described in Japanese Patent Application Laid-Open No. 4-114773.

In the rehabilitation repair method, a supply pipe branched from a main pipe laid under a road toward a demand destination is to be repaired. Remove the meter provided at the end side of the supply pipe and use it as a ground opening, and from this ground opening, supply the necessary amount of liquid resin to line the inside of the supply pipe,
In the first step, a plug is introduced into the pipe, and the entire amount of the resin plug is pressure-fed to the branch position on the main pipe side by the liquid flow pressed into the pipe, and in the second step, the suction means connected to the ground opening To suck and discharge the liquid flow, and apply the resin to the inner surface of the pipe by the flow of the resin plug pulled back to the end side of the supply pipe by the suction force to form a required lining film.

On the other hand, apart from the rehabilitation repair method described above, a rehabilitation repair of both pipes may be performed for a pipe form in which a supply pipe branched from the main pipe is connected to the main pipe. As a method for this purpose, the present applicant has previously described Japanese Patent Application Laid-Open No. H11-169.
A construction method as described in Japanese Patent Publication No. 788 is proposed. In this method, as the first step, the length of the branch supply pipe is measured to determine the amount of resin in the branch supply pipe, the resin is filled, and the resin is blocked by a lining pig positioned at the branch position. On the other hand, as a second step, the main supply pipe is filled with a resin amount determined by measuring the length of the main supply pipe to which the branch supply pipe is connected. When the amount of resin required for film formation is filled in the main supply pipe and the branch supply pipe, as a third step, the resin in the main supply pipe is sucked and lining is performed. Thereby, while the resin moves by suction in the main supply pipe, the lining pig located in the main supply pipe also moves while being sucked, whereby a lining film having a uniform thickness is formed on the inner surface of the main supply pipe. At this time, since the branch supply pipe side is sealed by the lining pig positioned at the branch position, the main supply pipe side is in the same state as a single pipe having no branch supply pipe, and the resin from the main supply pipe side is branched. It does not flow into the supply pipe. On the other hand, when the lining film is formed on the main supply pipe side, as a fourth step, lining work is performed on the branch supply pipe side. In this case,
Similarly to the main supply pipe side, the lining pig also moves in the process of sucking and moving the resin in the branch supply pipe, so that a lining film having a uniform thickness is formed in the branch supply pipe.
In the piping configuration to which the above-described method is applied, a curved pipe (elbow) may be used as the branch supply pipe as shown in FIG.

However, when such a construction method is performed, the following problem may occur. That is,
As shown in FIG. 3, a branch supply pipe (indicated by P2 for convenience) with respect to a main supply pipe (indicated by P1 for convenience).
When the lining pig on the branch supply pipe P2 side (indicated by a reference symbol R1 for convenience) is located at the branch position, the suction force acts on the lining pig R1 at the time of suction lining on the main supply pipe P1 side. . For this reason, as shown by a two-dot chain line in the figure, the lining pig R1 is connected to the main supply pipe P1.
It may fall to the side. As a result, lining work on the branch supply pipe P2 side becomes impossible, and rehabilitation repair on the branch supply pipe P2 side becomes impossible.

Therefore, in order to eliminate the inability of lining work due to such a problem, for example, as shown in FIG. 4, a case in which a branch supply pipe P2 using a curved pipe (elbow) is set as a pipe to be rehabilitated and repaired. A rod member R having a length larger than the radius of curvature of the curved portion of the branch supply pipe P2 and having a length that cannot pass through the curved portion is used. It is conceivable to use the lining pig A in which is disposed. Such a lining pig A can be caught by a curved portion of the branch supply pipe P2 due to a difference in curvature radius and a length that cannot pass through the curved portion, and cannot move. Do not be depressed.

[0008]

However, in the case where such a movement preventing means for catching at the curved portion is used, the lining pig A stopped at the curved portion is pulled back as shown in FIG. When the lining film moves, the lining film on the inside of the branch may be dug, and the lining film in a state of being formed may have an uneven thickness.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems in the conventional rehabilitation repair method, particularly in the case of using a lining pig having a configuration in which a fall to the main supply pipe side is prevented.
An object of the present invention is to provide a method of rehabilitating and repairing an existing pipeline in which the thickness of a non-uniform lining film which is hollowed out by a lining pig can be made uniform.

[0010]

In order to achieve this object, the invention according to claim 1 is directed to a pipeline including a branch pipe having a curved portion branched from a main pipe buried under a road. In a rehabilitation repair method of an existing pipeline to be rehabilitated and repaired by resin lining, a support member inserted into the branch pipe and shaped to be hooked at the curved portion, and attached to the support member and attached to the inner surface of the curved portion A lining pig that can face the lining film while maintaining the thickness of the lining film, and a lining pig that is arranged on a branch position side of the branch pipe and the main pipe and is connected to the lining pig via a member that can be pulled, and Prepare each leveling pig which can be floated in the above, and when the lining pig is inserted into the branch pipe, the support member and the lining pig are hooked on the curved portion so as to be in the branch position. While preventing movement to the main pipe, the leveling pig is located at the branch position side, and by pulling back the lining pig from this state, the lining pig is pulled back by the leveling pig in conjunction with the lining pig. It is characterized in that the lining film in the moved area is leveled.

According to a second aspect of the present invention, the supporting member is
It is characterized in that the radius is set to be larger than the radius of curvature of the curved portion and the length cannot be passed through the curved portion.

According to a third aspect of the present invention, the smoothing pig is
It is characterized in that it is positioned at a position where the branch position can be closed by the length of the traction member.

According to a fourth aspect of the present invention, the smoothing pig comprises:
It is characterized in that a soft spherical member is used.

[0014]

According to the first, second and fourth aspects of the present invention, the supporting member having a length to be hooked on the curved portion of the branch pipe and the lining pig attached to the supporting member and capable of contacting the inner surface of the curved portion of the branch pipe are provided. With this arrangement, the lining pig can be stopped at the bent portion, and the lining pig does not fall into the main pipe from the branch position where the branch pipe communicates with the main pipe. In addition, the lining film is leveled closer to the branch position than the lining pig, and the lining film in the range in which the lining pig has moved can be leveled. can do. Furthermore, since the leveling pig is arranged on the branch position side of the lining pig, the branch position side is leveled from the curved portion where the lining pig does not exist, and a lining film having a uniform thickness is formed by the pig. You can also.

According to the third aspect of the present invention, since the leveling pig can be positioned at a position where the branching position can be closed by the length of the traction member, the lining pig is not affected when the lining pig is pulled back. The entire area between the curved portion and the branch position can be used as the lining film application range.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to illustrated embodiments. FIG. 1 is a schematic diagram for explaining the principle of a rehabilitation repair method according to an embodiment of the present invention. FIG. 1 shows a state near a branch position between a main supply pipe 1 and a branch supply pipe 2. . As the branch supply pipe 2, a curved pipe (elbow) shown in FIG. 2 is used. In the branch supply pipe 1, as in the method described in the above-mentioned Japanese Patent Application Laid-Open No. 11-169788,
An amount of liquid resin corresponding to the length of the branch supply pipe 2 determined by the acoustic length measurement is fed under pressure. A leveling pig 5 and a lining pig 3 for forming a film of a uniform thickness are arranged at the head of the liquid resin fed under pressure into the branch supply pipe 2.

The lining pig 3 is provided on a support member 3A that is larger than the radius of curvature of the curved portion 2A in the branch supply pipe 2 and that is set to a length that cannot pass through the curved portion. As the support member 3A, a bolt having the above-described forming conditions is used, and the lining pig 3 made of a soft spherical member such as a sponge is provided between both ends in the longitudinal direction and between both ends.
Is attached. In order to stop the support member 3A at the curved portion 2A so that the support member 3A cannot pass therethrough, a thickness is required in addition to the above-described conditions.
The thickness of the support member 3A is secured by utilizing the outer diameter of the lining pig 3 attached to the support member 3A. Lining Pig 3
Can be in contact with the inner surface of the branch supply pipe 2, respectively, and as shown in FIG. 1, those located at both ends in the longitudinal direction of the support member 3A are on the outer inner peripheral surface of the curved portion 2A and between the both ends. Those located are in contact with the inner inner peripheral surface of the curved portion 2A. The contact state of the lining pig 3 is such that the radius of curvature which is one of the conditions of the support member 3A is
Based on being made larger than that of A.

On the other hand, a leveling pig 5 is connected to the lining pig 3 at a branch position between the branch supply pipe 2 and the main supply pipe 1 via a pullable member 4 such as a wire or a string. . Since the leveling pig 5 is not supported by a member such as the support member 3A having a rigid structure unlike the lining pig 3, the leveling pig 5 rides on the surface of the layered lining film on the inner surface of the branch supply pipe 2 to be lining pig. 3 can float in the radial direction independently, so-called its own center position can be matched with the center position of the branch supply pipe 2. Therefore, when the leveling pig 5 moves in the pipe while riding on the lining film on the inner surface of the branch supply pipe 2, the layer thickness of the lining film can be made uniform in the circumferential direction of the branch supply pipe 2. It has become. The outer diameter for defining the layer thickness of such a lining film is, of course, set as the outer diameter of the pig.

In this embodiment, the running pig 3 as described above is used.
The following steps are performed by using. In the first step, as described above, the amount of liquid resin corresponding to the length of the branch supply pipe 2 is fed under pressure to the branch supply pipe 2. At this time, the leveling pig 5 is located at the head of the liquid resin, then the lining pig 3 is inserted into the branch supply pipe 2, and the resin transport pig, the liquid absorbing material and the shielding Liquid pigs are sequentially inserted, and a volume of liquid excluding members located in front of the liquid pig is pumped behind the liquid absorbing pig. When the lining pig 3 reaches the curved portion of the branch supply pipe 2, the lining pig 3 is larger than the radius of curvature of the curved portion 2A, and the curved portion 2A
Is not long enough to pass through the curved portion 2A, and further movement, that is, movement toward the branch position between the branch supply pipe 2 and the main supply pipe 1 is prevented. At this time, the leveling pig 5 is located closer to the branch position than the curved portion 2A.

In the second step, an amount of liquid resin corresponding to the length of the main supply pipe 1 is fed under pressure to the main supply pipe 1. In this case, similarly to the first step described above, a lining pig, a resin transport pig, a liquid absorbing material, and a liquid-shielding pig are sequentially inserted, and a volume of liquid excluding these members is removed from the rear of the liquid-absorbing pig. Pumped.

As a third step, the suction lining is applied to the main supply pipe 1. In this case, a pig stopper, a suction pump, and a liquid recovery tank are installed on the ground, and the suction pump is operated to forcibly suck and discharge the liquid in the main supply pipe 1. The liquid absorbing material is moved to the ground side, and a uniform lining film is formed by the lining pig 3.

In the third step, a suction force also acts on the branch supply pipe 2 communicating with the main supply pipe 1. For this reason, the leveling pig 5 located on the branching position side of the lining pig 3 which is blocked from moving while being hooked on the curved portion 2A tries to move from the branching position or the branching position to the main pipe 1 side. Since they are connected by the member 4, their movement is prevented, and they do not fall into the main pipe 1 side. In addition, by receiving the suction force from the main pipe 1 side, the leveling pig 5 is positioned closer to the branch position than the lining pig 3.

In the fourth step, the suction lining is applied to the branch supply pipe 2. In this case, as in the case where the main supply pipe 1 is targeted, the liquid in the branch supply pipe 2 is sucked and discharged, and accordingly, the lining pig 3 that has stopped at the bent portion 2A is reverse to that at the time of insertion. Is pulled back toward the ground. When the lining pig 3 moves so as to be pulled back to the ground side, the leveling pig 5 moves in the same direction as the lining pig 3 via the traction member 4, so that the diverging position side than the curved portion 2A which has been located so far. In addition to the formation of the lining film, the thickness of the lining film dug by the lining pig 3 from the curved portion 2A to the above-ground opening side by the lining pig 3 from the curved portion 2A is made uniform.

According to this embodiment, since the leveling pig interlocking with the lining pig is located on the rear side in the direction in which the lining pig is pulled back, the thickness of the lining film that has been cut by the lining pig is corrected. And a lining film can be formed in a place where the lining pig 3 does not exist.

With respect to the formation of the lining film at a place where the lining pig 3 does not exist, for example,
By adjusting the length, the leveling pig 5 can be positioned at a position that closes the branch position. As a result, the leveling pig 5 does not fall to the main supply pipe 1 side, and even if the distance from the branch position to the curved portion 2A is long, a uniform thickness film can be formed over the entire range. . Further, since the lining pig 3 can be linked with the lining pig 3 via the traction member 4, the leveling pig 5 can be reused without being lost.

[0026]

According to the first, second and fourth aspects of the present invention, a supporting member having a length to be hooked on a curved portion of a branch pipe;
By providing a lining pig attached to this and capable of contacting the inner surface of the bent part of the branch pipe, the lining pig can be stopped at the bent part, and the main pipe is moved from the branch position where the branch pipe and the main pipe communicate. The lining pig does not fall into the pipe. In addition, the lining film is leveled closer to the branch position than the lining pig, and the lining film in the range in which the lining pig has moved can be leveled. can do. In addition, the leveling pig is located closer to the branch position than the lining pig,
It is also possible to form a lining film having a uniform thickness with the pig by leveling the branch position side from the curved portion where the lining pig does not exist.

According to the third aspect of the present invention, since the leveling pig can be positioned at a position where the branching position can be closed by the length of the traction member, the influence of the lining pig when the lining pig is pulled back is reduced. The entire area between the curved portion and the branch position that cannot be reached can be set as the lining film application range.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining the principle of a rehabilitation repair method according to an embodiment of the present invention.

FIG. 2 is a partial perspective view illustrating an example of a piping configuration in which a rehabilitation repair method is performed.

FIG. 3 is a schematic diagram for explaining a problem in the piping configuration shown in FIG. 2;

FIG. 4 is a schematic diagram for explaining one method for solving the problem shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main supply pipe 2 Branch supply pipe 2A curved part 3 Lining pig 3A Support member 4 Traction member 5 Leveling pig

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-57-75179 (JP, A) JP-A-6-126247 (JP, A) JP-A-9-262527 (JP, A) 181481 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B05D 7/22 B05C 7/08 F16L 55/16

Claims (4)

(57) [Claims] 1. A rehabilitation repair method of an existing pipeline for rehabilitating and repairing a pipeline including a branch pipe having a curved portion branched from a main pipe buried under a road by using a resin lining. A supporting member that is inserted into the curved portion and is shaped to be hooked at the curved portion; a lining pig attached to the supporting member and capable of facing the inner surface of the curved portion while maintaining the thickness of the lining film; A leveling pig that is arranged on the branching position side of the branch pipe and the main pipe and is connected to the lining pig via a towable member and that can float in the pipe is prepared, and the lining pig is placed in the branch pipe. When the support member and the lining pig are hooked on the bent portion when inserted into the bent portion, the movement from the branch position to the main pipe is prevented, and the leveling pig is moved into the main pipe. It is located at the Toki position side,
A method for rehabilitating an existing pipeline, wherein the lining pig is pulled back from this state to level the lining film in a range where the lining pig has moved by the leveling pig pulled back in conjunction with the lining pig. 2. The existing pipe line according to claim 1, wherein the support member has a radius larger than a radius of curvature of the curved portion and is set to a length that cannot pass through the curved portion. Rehabilitation repair method. 3. The method for rehabilitating an existing pipeline according to claim 1, wherein the leveling pig is positioned at a position where the branching position can be closed by the length of the traction member. . 4. The method for rehabilitating an existing pipeline according to claim 1, wherein the leveling pig is made of a soft spherical member.