JP2001096226A - Method of regenerating and repairing existing pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of regenerating and repairing existing pipe line capable of preventing from making lining work impracticable in a branched supply pipe in the case of treating the branched supply pipe including a bend pipe. SOLUTION: In the method of regenerating and repairing existing pipe line for regenerating and repairing a pipe line including the branched pipe 2 branched from a main pipe 1 buried under a road and having a bend part by resin lining, lining pigs 3 ranging on a supporting member 3A having a larger axis line radius than the radius of curvature of the bend part 2A in the bend pipe is prepared and the lining pig is prevented from moving to the main pipe 1 from the branched position by being caught by the bend part 2 of the bend pipe.

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 an existing pipeline, such as a gas pipe, in which a main pipe and a branch pipe using a curved pipe are simultaneously resin-lined.

[0002]

2. Description of the Related Art Various techniques have been developed and proposed for rehabilitation and repair by non-excavation while existing pipes are laid. For example, recently, a resin lining method for 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 this rehabilitation repair method, a supply pipe branched from a main pipe laid under a road toward a demand destination is targeted for repair. Remove the meter provided at the end of the supply pipe and use it as a ground opening.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. In the second step, suction means connected to the above-mentioned opening in the ground To suck and discharge the liquid flow, and apply the resin to the inner surface of the tube by the flow of the resin plug pulled back to the end side of the supply tube by the suction force to form a required lining film.

On the other hand, apart from the above-mentioned rehabilitation repair method, rehabilitation and repair of both pipes may be performed for a piping form in which a supply pipe branched from the main pipe is connected. As a method for this purpose, the present applicant has previously described Japanese Patent Application Laid-Open No. H11-169788.
Has proposed a construction method as described in Japanese Unexamined Patent Application Publication No. 2000-214,197. In this method, as a 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 the amount of resin determined by measuring the length of the main supply pipe connected to the branch supply pipe. When the main supply pipe and the branch supply pipe are filled with an amount of resin necessary for film formation, as a third step, the resin in the main supply pipe is sucked and lining is performed. Thereby, while the resin is sucked and moved in the main supply pipe, the lining pig located in the main supply pipe is also moved while being sucked, so that 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, the lining work on the branch supply pipe side is performed as a fourth step. 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, and a lining film having a uniform thickness is formed in the branch supply pipe. In the piping form to which the above-described method is applied, a curved pipe (elbow) may be used as the branch supply pipe as shown in FIG.

[0006]

However, when such a construction method is implemented, the following problems may occur. That is, as shown in FIG. 3, a lining pig (for the sake of convenience, denoted by R1) on the side of the branch supply tube P2 is located at the branch position of the branch supply tube (for convenience, denoted by reference numeral P2) with respect to the main supply tube (for convenience, denoted by reference numeral P1). When the suction lining is positioned on the main supply pipe P1, the suction force acts on the lining pig R1. For this reason, as shown by the two-dot chain line in the figure, the lining pig R1 may fall into the main supply pipe P1 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.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the problems in the conventional rehabilitation repair method described above, and in particular, in the case of a branch supply pipe including a curved pipe, preventing lining work in the branch supply pipe from becoming impossible. An object of the present invention is to provide a rehabilitation repair method for existing pipelines.

[0008]

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 be brought into contact with the main pipe, and the support member and the lining pig inserted into the branch pipe toward the main pipe are caught at the bent portion, thereby preventing movement from the branch pipe to the main pipe. Then, in this state, the lining inside the branch pipe is performed by being pulled back toward the open end of the branch pipe.

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

[0010] The invention according to claim 3 is characterized in that the lining pig uses a soft spherical member which is attached in plural numbers along the length direction of the support member.

The invention according to claim 4 is characterized in that the lining pig is formed of a soft, substantially cylindrical member having a longitudinal direction parallel to the longitudinal direction of the support member.

[0012]

According to the first, third 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 a branch position where the branch pipe and the main pipe communicate with each other. In addition, when the wire is pulled back, the lining film can be formed by the lining pig stopped at the curved portion.

According to the second aspect of the present invention, since the supporting member has a length larger than the radius of curvature of the curved portion and cannot pass through the curved portion, the supporting member is surely formed at the curved portion when inserted into the branch pipe. Since the lining pig attached to the support member can be prevented from dropping into the main pipe side, it is possible to reliably prevent the lining film from being formed using the lining pig.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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 lining pig 3 for forming a film with a uniform thickness is disposed at the head of the liquid resin fed into the branch supply pipe 2.

The lining pig 3 is provided on a support member 3A having a length larger than the radius of curvature of the curved portion 2A in the branch supply pipe 2 and having a length that cannot pass through the curved portion 2A.
As the support member 3A, a bolt satisfying the above-described conditions is used, and the lining pig 3 made of a soft spherical member such as a sponge is attached between both ends in the longitudinal direction and both ends. In order to prevent the support member 3A from passing through the curved portion 2A so that the support member 3A cannot pass therethrough, a thickness is required in addition to the above-described conditions. In the present embodiment, the outer diameter of the lining pig 3 attached to the support member 3A is required. The thickness of the support member 3A is ensured by utilizing the above. The lining pigs 3 can abut against the inner surface of the branch supply pipe 2, respectively. 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 What is located between both ends is in contact with the inner peripheral surface of the curved portion 2A. Such a contact state of the lining pig 3 is based on the condition that the radius of curvature, which is one of the conditions of the support member 3A, is larger than that of the curved portion 2A.

In this embodiment, the running pig 3 as described above is used.
, The following steps are performed. In the first step, as described above, an amount of liquid resin corresponding to the length of the branch supply pipe 2 is fed to the branch supply pipe 2 under pressure. At this time, the lining pig 3 is located at the head of the liquid resin, and similarly to the case described in the above publication, the resin transport pig, the liquid absorbing material, and the liquid shielding pig are sequentially inserted, and further, behind the liquid absorbing pig. A volume of liquid excluding a member located in front of the liquid is pumped. When the lining pig 3 reaches the curved portion of the branch supply pipe 2, the lining pig 3 is caught by the curved portion 2A because it is larger than the radius of curvature of the curved portion 2A and has a length that cannot pass through the curved portion 2A. , That is, movement toward the branch position between the branch supply pipe 2 and the main supply pipe 1 is prevented.

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, the lining pig, the resin transport pig, the liquid absorbing material, and the liquid-shielding pig are sequentially inserted, and a liquid having a volume excluding these members is removed from the rear of the liquid-absorbing pig. Pumped.

As a third step, a 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 liquid in the main supply pipe 1 is forcibly sucked and discharged by operating the suction pump. The liquid absorbing material is moved to the ground side, and a uniform lining film is formed by the lining pig.

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 lining pig 3 tries to move toward the branch position,
Since the lining pig 3 remains stuck on the curved portion 2A based on the forming conditions of the support member 3A, the movement toward the branch position is prevented. Thereby, the lining pig 3 located on the branch supply pipe 2 side does not fall into the main supply pipe 1 from the branch position.

In the fourth step, the suction lining is applied to the branch supply pipe 2. In this case, as in the case of the main supply pipe 1, the liquid in the branch supply pipe 2 is sucked and discharged, and accordingly, the lining pig 3 stopped at the bent portion 2A is transferred to the branch supply pipe 2. Is pulled back in the direction opposite to the insertion direction, and in the process, a uniform lining film is formed by the lining pig 3.

The lining pig 3 is not limited to a spherical shape, but may be a substantially cylindrical shape such as a shell shape or an American dog shape having a longitudinal direction parallel to the longitudinal direction of the support member 3A. Is also possible.

[0022]

According to the first, third 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 abutting on the inner surface of the curved part of the branch pipe, the lining pig can stop at the curved part, and the main pipe starts from the branch position where the branch pipe and the main pipe communicate. The lining pig does not fall into the pipe. In addition, when the wire is pulled back, the lining film can be formed by the lining pig stopped at the curved portion. As a result, the lining pig can always be used for forming the lining film of the branch pipe.

According to the second aspect of the present invention, since the supporting member has a length larger than the radius of curvature of the curved portion and cannot pass through the curved portion, when the supporting member is inserted into the branch pipe, the supporting member has a larger radius. Since the lining pig attached to the support member can be prevented from dropping into the main pipe side, it is possible to reliably prevent the lining film from being formed using the lining pig.

[Brief description of the drawings]

FIG. 1 is a schematic view 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;

[Explanation of symbols]

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

Claims (4)

[Claims] 1. A method of rehabilitating an existing pipeline for repairing a pipeline including a branch pipe having a curved portion branched from a main pipe buried under a road by resin lining. And a lining pig attached to the support member and capable of abutting on the inner surface of the bent portion is provided, and the branch is directed toward the main pipe. When the support member and the lining pig are caught by the bent portion when inserted into the pipe, the movement from the branch pipe to the main pipe is prevented, and in this state, the pipe is pulled back toward the open end of the branch pipe. A method for rehabilitating and repairing an existing pipeline, wherein a lining inside the branch pipe is performed by the above method. 2. The existing pipeline 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 of rehabilitating an existing pipeline, wherein a plurality of soft spherical members attached along the length direction of the support member are used for the lining pig. 4. The method for rehabilitating an existing pipeline according to claim 1, wherein said lining pig is a soft, substantially cylindrical member having a longitudinal direction parallel to the longitudinal direction of said support member. .