JP5053937B2 - Rehabilitation of existing pipes - Google Patents

Description

  The present invention relates to a method for rehabilitating an existing pipe, in which a spiral pipe is formed from a spiral band member inside an existing pipe such as an agricultural water pipe, a sewer pipe, and a water pipe.

  In existing pipes such as agricultural water pipes, sewer pipes, and water pipes, the existing pipes are lined with synthetic resin etc. as a countermeasure when the existing pipes become obsolete due to cracks or corrosion. Rehabilitation is being done.

  As a method of rehabilitating an existing pipe using such a lining pipe, a strip-like member having joints formed on both sides is supplied into the existing pipe, and the joints of spiral strip-like members adjacent to each other are joined together to form a spiral pipe. A method of pipe making is known. For example, while a drum around which a belt-shaped member is wound is installed on the ground, a pipe-making device is arranged in an existing pipe, and the belt-shaped member is spirally supplied from the drum to the pipe-making device. A method is proposed in which the adjacent joints are joined together to form a spiral tube, and the spiral tube thus formed is left behind, and a new strip member is supplied in front of the spiral tube to sequentially add and form the spiral tube. (For example, refer to Patent Document 1).

On the other hand, in the case of newly laying a cable protection tube in which an optical fiber, power cable, etc. are stored in the existing pipe, after rehabilitation by forming a spiral pipe in the existing pipe, between the existing pipe and the spiral pipe Cable protection pipes are laid. That is, when manufacturing a spiral tube, it has been proposed to form a recess in the upper portion of the spiral tube and to lay a cable protection tube in the recess formed in the upper portion of the spiral tube (see, for example, Patent Document 2). ).
Japanese Patent No. 3072015 JP-A-11-82865

  By the way, in a situation where a cable protection tube in which a communication cable or the like is already stored is laid in an existing pipe, when the existing pipe is rehabilitated by a spiral pipe, the cable protection pipe is laid inside the produced spiral pipe In order to supply the spiral belt-shaped member, it is necessary to accommodate the cable protection tube inside the spiral belt-shaped member. That is, when the spiral belt-like member is rotated so as to be wound around the cable protection tube, it is necessary that the tip of the belt-like member sinks below the cable protection tube. In this case, the cable protection pipe is submerged in running water such as sewage flowing down the existing pipe and disposed at the bottom of the existing pipe, and the tip of the belt-like member is laid with the cable protection pipe and the cable protection pipe It is difficult to visually check whether it has passed between existing pipes. For this reason, inside the existing pipe, a plurality of workers lift and support the cable protection pipe, and rotate the spiral belt-like member so that its tip passes below the cable protection pipe. While trying to supply.

  In addition, if the support of the cable protection pipe is released by arranging a spiral belt-shaped member, the cable protection pipe will contact with the belt-shaped member disposed so as to sink into the running water and contact the tube bottom of the existing pipe. There is a possibility that the belt-like member drawn in with the pipe making operation by the pipe making apparatus may get entangled with the cable protective pipe and cut the cable protective pipe. For this reason, it is necessary to install monitoring personnel over the entire construction section and monitor the presence or absence of abnormalities in the cable protection pipe. However, as described above, the situation of the cable protection pipe submerged in running water is accurately determined. It cannot be grasped, and it is difficult to reliably prevent the cable protection tube from being cut.

  As described above, in a situation where the cable protection pipe is already laid on the existing pipe, when the existing pipe is rehabilitated by the spiral pipe, a lot of workers and work time are required, and the cable protection pipe is cut. There was a fear.

  The present invention has been made in view of such problems, and when rehabilitating an existing pipe in a situation where a cable protection pipe such as a communication cable pipe is already laid on the existing pipe, the cable protection pipe is surely cut. It is an object of the present invention to provide a method for rehabilitating an existing pipe, which can efficiently regenerate the existing pipe by producing a spiral pipe made of a band-like member in the existing pipe while preventing it.

  In the present invention, in an existing pipe, a strip-like member having joints formed on both sides is spirally supplied, and adjacent joints are joined together to produce a spiral pipe. In an existing pipe rehabilitation method in which a strip member is left to be supplied and a spiral tube is additionally formed in order to renovate an existing pipe in order to regenerate the existing pipe, at least a part of the outer peripheral surface of the cable protection pipe laid on the existing pipe A buoyancy layer with a density lower than that of water is provided, and the cable protection tube is floated on the flowing water flowing down the existing pipe, and the spiral belt-like member is rotated with respect to the floating cable protection tube to protect the cable inside. After the tube is accommodated, the spiral tube is manufactured from the spiral belt-shaped member.

  According to the present invention, by providing a buoyancy layer having a density lower than that of water on the outer peripheral surface of the cable protection pipe laid on the existing pipe, the cable protection pipe is floated on the flowing water flowing down the existing pipe. On the other hand, by pulling the spiral belt member into the existing pipe and rotating the spiral belt member around the cable protection tube floating in the running water, the cable is protected inward of the spiral belt member. Accommodates the tube. Thereafter, the adjacent joining portions of the spiral belt-like member are joined together to produce a spiral tube, and the produced spiral tube is left and a new belt-like member is supplied in front of the spiral tube. Are sequentially formed, and a spiral tube is formed by a spiral belt-like member. Similarly, the spiral belt-like member is drawn into the existing pipe, rotated so that the spiral belt-like member is wound around the floating cable protection tube, and the cable protection tube is placed inside the spiral belt-like member. After the housing, the front end of the band-shaped member is fused and connected to the rear end of the previous band-shaped member, and then the adjacent joints are bonded to each other in front of the previous spiral tube to additionally form the spiral tube. By repeating this, the existing pipe is rehabilitated by producing a spiral pipe over the construction section.

  As a result, the work of lifting and supporting the cable protection tube or monitoring the entanglement between the belt-like member and the cable protection tube over the entire line becomes unnecessary, and the work can be saved. In addition, since the cable protection tube floats in the running water, it is possible to prevent entanglement with the belt-like member as much as possible, shorten the work time, and ensure the cutting of the cable protection tube. Can be prevented. Even if the cable protection tube and the belt-shaped member come into contact with each other, the cable protection tube is expanded by the buoyancy layer and floated in the flowing water, so that it can be surely grasped visually and quickly. It will be able to respond.

  In this invention, it is preferable that the said buoyancy layer is a lightweight part surrounding the outer peripheral surface of a cable protective tube. As a result, the cable protection tube can be reliably floated in running water.

  Here, as the lightweight portion, foamed tubes such as closed cell foamed polystyrene, foamed urethane, and foamed olefin can be used. That is, the foam tube can be cut to a set length, a cut can be formed in the longitudinal direction, and the foam tube having the set length can be attached to the cable protection tube through the cut.

  In this invention, it is preferable that the said buoyancy layer is comprised from the lightweight part which surrounds the outer peripheral surface of a cable protective tube, and the protective part which coat | covers this lightweight part. As a result, the cable protection tube can be reliably floated on the running water by the lightweight part, and the lightweight part can be protected by the protection part.

  Here, as the lightweight portion, foamed tubes such as closed cell foamed polystyrene, foamed urethane, and foamed olefin can be used. That is, the foam tube can be cut to a set length, a cut can be formed in the longitudinal direction, and the foam tube having the set length can be attached to the cable protection tube through the cut.

  Moreover, as a protection part, resin pipes, such as a vinyl chloride, can be utilized, for example. That is, similarly to the foam tube, the resin tube can be cut to a set length, a cut can be formed in the longitudinal direction, and the resin tube having the set length can be attached to the foam tube through the cut.

  In this case, the resin tube is preferably a perforated tube. As a result, even if running water enters the resin tube, when pulling up the cable protection tube to provide a buoyancy layer, the running water that has entered inside can be drained, and the cable protection tube can be pulled up easily, It is possible to prevent the cable protection tube from being adversely affected by the increase in the weight.

  According to the present invention, when rehabilitating an existing pipe in a situation where a cable protective pipe such as a communication cable pipe is already laid on the existing pipe, the strip-shaped member is efficiently installed in the existing pipe while reliably preventing the cable protective pipe from being cut. The existing pipe can be rehabilitated by making a spiral pipe made of

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a method for rehabilitating an existing pipe according to the present invention will be described with reference to the drawings.

  First, prior to explaining the rehabilitation method of the present invention, the strip-shaped member 100 used in the rehabilitation method and the pipe manufacturing apparatus 10 for manufacturing the spiral tube R from the strip-shaped member 100 will be described.

  The band-shaped member 100 is formed of a synthetic resin (for example, hard vinyl chloride, polyethylene, polypropylene, etc.) in a long shape, and as shown in FIG. 1, the inner surface is formed substantially smoothly, A plurality of T-shaped ribs 103 are continuously formed on the outer surface along the longitudinal direction. Further, on both sides of the belt-like member 100, joint portions 101 and 102 that are joined to overlap each other in the inside and outside are continuously formed along the longitudinal direction. That is, the front edge side joint portion 101 has the base portion of the rib 103A at the front end thereof bulged to form a concave groove 104 from the inner surface side, and a protruding portion 105 that is inclined outward from the rib 103A is continuously provided. Has been. In addition, the rear edge side joint portion 102 has a protruding portion 106 extending horizontally from the rib 103B on the rear end side, and is joined to the concave groove 104 of the front edge side joint portion 101 near the end portion of the protruding portion 106. A ridge 107 is formed.

  The belt-like member 100 having such a structure is supplied in a spiral shape, and as shown in FIGS. 2A and 2B, the front and rear ends of the belt-like members 100 and 100 adjacent to each other overlap and are already joined. The rear edge side joining portion 102 following the front edge side joining portion 101 of the belt shaped member 100 is supplied from the inside, and the protruding strip 107 is provided in the concave groove 104, and the protruding portion 105 is provided in the flange of the rib 103B. By respectively fitting and joining the end portions of the belt-shaped members 100, 100 adjacent to each other can be connected to each other.

  As shown in FIG. 3, the pipe making apparatus 10 includes a forming frame 12 that is formed in a substantially annular shape by rotatably supporting a plurality of guide rollers 11, and a front end portion of the belt-like member 100. The main part is comprised from the junction mechanism 13 which joins the junction part 101 formed in this, and the junction part 102 formed in the rear-end part.

  The forming frame 12 includes a plurality of link bodies 121 in which a pair of link members are rotatably connected via a connecting shaft, and a pair of adjacent link bodies 121 are detachably connected in order and formed in a substantially annular shape. Has been. And the guide roller 11 which consists of a synthetic resin or a metal is rotatably supported by the connection shaft of each link body 121 via a bearing.

  Here, although a pair of link members constituting the link body 121 are not shown in detail, the rotation range is restricted and the link body 121 is restricted from bending inward.

  In addition, the guide roller 11 rotates along the inner surface of the strip-shaped member 100 supplied spirally in the existing pipe K, and in order to advance the pipe making apparatus 1 while producing the helical pipe R, the helical pipe It is arranged so as to be perpendicular to the belt-like member 100 constituting R.

  The joining mechanism 13 includes an inner roller 131 and an outer roller 132, and the inner roller 131 and the outer rotor 132 are set to rotate synchronously via a hydraulic motor and a gear reducer (not shown). Further, a feed roller 133 having a slightly larger diameter than the outer roller 132 is provided on the rotation shaft of the outer roller 132 and is set so as to contact the inner peripheral surface of the existing pipe K.

  The procedure for producing the spiral pipe R with this pipe making apparatus 1 will be briefly described with reference to FIG.

  In the vicinity of the upstream manhole M1, the drum D around which the belt-like member 100 is wound is carried, and the belt-like member 100 is pulled out from the inner peripheral side of the drum D, and the existing pipe K is passed through the upstream manhole M1. Pull in. Then, the joining portions 101 and 102 of the strip-like member 100 drawn out in a spiral shape are joined manually to produce a several-pitch spiral tube (starting spiral tube) R0. Next, the molding frame 12 is assembled on the inner peripheral side of the starting spiral tube R0, and the joining mechanism 13 is disposed on the front end edge of the starting spiral tube R0. That is, the adjacent belt-like members 100, 100 are sandwiched between the inner roller 131 and the outer roller 132.

  Next, if a hydraulic motor (not shown) is driven using the generator G installed on the ground of the downstream manhole M2 and the hydraulic unit U carried into the existing pipe K, the belt-like member 100 is moved via the gear reducer. The inner roller 131 and the outer roller 132 rotate in directions opposite to each other in the feeding direction, and the feed roller 133 provided coaxially with the outer roller 132 rotates in contact with the inner peripheral surface of the existing pipe K and receives the reaction. The pipe making apparatus 10 moves around along the inner peripheral surface of the existing pipe K. At this time, the rotating inner roller 131 and outer roller 132 sandwich the adjacent belt-like members 100, 100, and the rear edge side of the belt-like member 100 newly supplied to the front edge side joining portion 101 of the belt-like member 100 joined earlier. The belt-like members 100 and 100 adjacent to each other are connected to each other by fitting the joint portion 102 from the inside and joining them.

  At this time, the pipe making apparatus 10 moves around the inner peripheral surface of the existing pipe K along the belt-like member 100 supplied spirally into the existing pipe K, and moves in the pipe axis direction, thereby forming a spiral shape. The supplied strip member 100 is joined and connected to the front end edge of the strip member 100 of the spiral tube R that has been joined and left in advance, and the spiral tube R is sequentially manufactured.

  Next, the existing pipe rehabilitation method of the present invention will be described.

  In the existing pipe K, a cable protection pipe P in which a communication cable such as an optical fiber or a power cable is stored is laid. The cable protection pipe P is disposed at the bottom of the pipe by sinking into running water flowing down the existing pipe K (see FIG. 5). After pulling up and supporting such a cable protection pipe P from running water, the buoyancy layer 1 having a density lower than that of water is formed around the cable protection pipe P. That is, a foam tube as a lightweight portion, for example, a polystyrene foam tube 2 is attached around the cable protection tube P, and a resin perforated tube 3 as a protection portion 3 is attached around the foam polystyrene tube 2 (FIG. 6, see FIG.

  Here, the expanded polystyrene tube 2 and the perforated tube 3 are cut to a set length, for example, about 2 m, and a cut is formed along the longitudinal direction. By sequentially attaching the protective tube P and the expanded polystyrene tube 2 to the protective tube P, the buoyancy layer 1 including the expanded polystyrene tube 2 and the perforated tube 3 can be provided over the entire length of the cable protective tube P.

  The thickness of the expanded polystyrene tube 2 is set so as to generate a buoyancy that causes the cable protection pipe P to float on running water flowing down the existing pipe K. As a result, the cable protection pipe P provided with the buoyancy layer 1 floats in the flowing water flowing down the existing pipe K.

  In addition, when attaching the polystyrene foam tube 2 and the perforated pipe | tube 3 of set length to the cable protection pipe P in order, when the cable protection pipe P is lifted by the operator, a part of the buoyancy layer 1 attached previously will be pulled up. It is done. At this time, the flowing water that has entered the perforated tube 3 of the buoyancy layer 1 is drained through the small hole 3 a of the perforated tube 3. For this reason, the cable protection tube P can be pulled up easily, and mounting work can be easily performed. In addition, it is possible to prevent the weight of the cable protection pipe P from being adversely affected by the ingress of running water and adversely affecting the cable protection pipe P.

  If the cable protection tube P floats on running water by forming the buoyancy layer 1 composed of the foamed polystyrene tube 2 and the perforated tube 3 around the cable protection tube P, as described above, a belt-like shape is formed from the inner peripheral side of the drum D. The member 100 is pulled out and is drawn into the existing pipe K through the upstream manhole M1. When the belt-shaped member 100 having the set length is pulled out, the belt-shaped member 100 is cut on the drum D side. Next, the belt-shaped member 100 having a set length drawn into the existing pipe K is rotated so as to be wound around the cable protection tube P floating on the flowing water by the buoyancy layer 1, The cable protection tube P is accommodated in the direction. That is, the belt-shaped member 100 is wound around the cable protection tube P and rotated so that the front end of the belt-shaped member 100 enters under the cable protection tube P (see FIG. 8).

  At this time, the cable protection pipe P floats on the flowing water flowing down the existing pipe K, and a certain space (running water) is secured between the existing pipe K and the bottom of the pipe, and the diameter is expanded by the buoyancy layer 1. The operator can visually grasp the tip of the spiral belt-like member 100 that enters the running water below the cable protection tube P on which the buoyancy layer 1 is formed. Therefore, the cable protection tube P in which the buoyancy layer 1 is formed inside the spiral belt-shaped member 100 can be reliably accommodated.

  As the set length for sequentially winding and rotating the spiral belt-shaped member 100, as the length increases, the torsional torque for rotating the spiral belt-shaped member 100 increases, so that many operators About 200 m is preferable because it is necessary.

  When the cable protection tube P is accommodated in the inside of the spiral strip member 100 over the entire length, the joint portions 101 and 102 of the spiral strip member 100 are joined manually, and a starting spiral tube having several pitches is formed. Pipe R0. Next, the forming frame 12 of the pipe making apparatus 10 is assembled on the inner peripheral side of the starting spiral tube R0, the joining mechanism 13 is disposed on the front edge of the starting spiral tube R0, and the space between the inner roller 131 and the outer roller 132 is set. The band-shaped members 100, 100 adjacent to each other are sandwiched. Thereafter, when a hydraulic motor (not shown) is driven, the inner roller 131 and the outer roller 132 rotate in directions opposite to each other in the direction in which the belt-shaped member 100 is fed, and the feed roller 133 comes into contact with the inner peripheral surface of the existing pipe K. Rotating and receiving the reaction, the pipe making apparatus 10 moves around along the inner peripheral surface of the existing pipe K. At this time, the rotating inner roller 131 and outer roller 132 sandwich the adjacent belt-like members 100, 100, and the rear edge side of the belt-like member 100 newly supplied to the front edge side joining portion 101 of the belt-like member 100 joined earlier. The belt-like members 100 and 100 adjacent to each other are connected to each other by fitting the joint portion 102 from the inside and joining them.

  At this time, the pipe making apparatus 10 moves around the inner peripheral surface of the existing pipe K along the belt-like member 100 supplied spirally into the existing pipe K, and moves in the pipe axis direction, thereby forming a spiral shape. The supplied strip member 100 is joined and connected to the front end edge of the strip member 100 of the spiral tube R that has been joined and left in advance, and the spiral tube R is sequentially manufactured.

  When the production of the spiral tube R is completed for the belt member 100 having the set length, the belt member 100 is again pulled out from the inner peripheral side of the drum D by the set length, and is drawn into the existing tube K through the upstream manhole M1. After that, on the drum D side, the belt-like member 100 is cut, and then the belt-like member 100 having a set length drawn into the existing pipe K is lifted against the cable protection pipe P floating on the flowing water by the buoyancy layer 1. The cable protection tube P is accommodated inside the spiral belt-shaped member 100. After that, the front end of the band-shaped member 100 having a new set length is fused to the rear end of the preceding band-shaped member 100 via a fusion machine (not shown), and after being integrally connected, the hydraulic motor is driven to produce the pipe. You just have to resume your work.

  Similarly, after the belt-like member 100 is drawn into the existing pipe K and rotated so as to be wound around the cable protection pipe P that has been levitated by the buoyancy layer 1, the cable protection pipe P is accommodated inside thereof, The front end may be fused and connected to the rear end of the preceding belt-like member 100, and a pipe making operation may be performed to make the pipe over the construction section.

  In the above-described embodiment, the case where the cable protection tube P is levitated by providing the cable protection tube P with the buoyancy layer 1 including the foamed polystyrene tube 2 and the perforated tube 3 has been described. When it is not particularly necessary to protect the protective layer, it is not always necessary to attach the protective layer.

  In addition to the belt-like member 100 shown in FIGS. 1 and 2, a belt-like member 110 joined via a connector 120 as shown in FIGS. 9 and 10 may be employed.

  Specifically, the belt-like member 110 is also formed by molding a synthetic resin (for example, hard vinyl chloride, polyethylene, polypropylene, etc.) into a long shape, and its inner surface is formed substantially smoothly and its outer surface. A plurality of T-shaped ribs 113 are formed continuously along the longitudinal direction. Then, joint portions 111 and 112 are continuously formed along the longitudinal direction at both side edge portions of the belt-shaped member 110, and joint concave grooves 114 are formed at the front edge side joint portion 111 and the rear edge side joint portion 112, respectively. Has been. On the other hand, in the connector 120, the joint convex portion 121 that can be joined to the joint concave portion 113 of the front edge side joint portion 111 and the joint concave portion 113 of the rear edge side joint portion 112 in the belt-like member 110 is continuously formed along the longitudinal direction. .

  Such a belt-like member 110 is supplied in a spiral shape, and the joining recess 113 of the trailing edge side joint portion 112 in the preceding belt-like member 110 in a state where the front end portion and the rear end portion of the belt-like members 110, 110 adjacent to each other are abutted. Further, the adjacent belt-like members 110 and 110 are connected by fitting the connector 120 from the inside of the belt-like member 110 and joining them across the joint recess 113 of the leading edge side joint portion 111 in the subsequent belt-like member 110. Can do.

It is sectional drawing which shows an example of the strip | belt-shaped member used for the rehabilitation method of the existing pipe | tube of this invention. It is sectional drawing explaining the joining state of the strip | belt-shaped member shown in FIG. It is a front view which shows an example of the pipe making apparatus used for the rehabilitation method of the existing pipe | tube of this invention. It is the schematic explaining the pipe making operation | work by the pipe making apparatus of FIG. It is a perspective view which shows the cable protection pipe laid in the existing pipe when implementing the rehabilitation method of the existing pipe of this invention. It is a perspective view explaining the construction point of the rehabilitation method of the existing pipe of the present invention. It is a longitudinal cross-sectional view of the existing pipe | tube of FIG. It is a perspective view explaining the construction point of the rehabilitation method of the existing pipe of the present invention. It is sectional drawing which shows the other example of the strip | belt-shaped member used for the rehabilitation method of the existing pipe | tube of this invention. It is a perspective view which abbreviate | omits and shows the joining state of the strip | belt-shaped member shown in FIG.

Explanation of symbols

1 Buoyancy layer 2 Styrofoam tube (lightweight part)
3 perforated pipe (protection part)
DESCRIPTION OF SYMBOLS 10 Pipe manufacturing apparatus 11 Guide roller 12 Molding frame 13 Joining mechanism 131 Inner roller 132 Outer roller 100,110 Strip member 101,102,111,112 Joining part 120 Connector K Existing pipe P Cable protection pipe R Spiral pipe

Claims (3)

  In the existing pipe, a belt-like member having joints formed on both sides is spirally supplied, and the adjacent joints are joined together to produce a spiral pipe, and the produced spiral pipe is left behind. In a method for rehabilitating an existing pipe by supplying a new belt-shaped member to the front and sequentially forming a spiral pipe to rehabilitate the existing pipe, at least a part of the outer peripheral surface of the cable protection pipe laid on the existing pipe is more than water. A buoyancy layer with a low density is provided, and the cable protection tube is levitated to the running water flowing down the existing tube, and the cable protection tube is accommodated inside by rotating a spiral belt-like member with respect to the levitated cable protection tube Then, a method for rehabilitating an existing pipe, wherein a spiral pipe is manufactured from a spiral belt-like member.   2. The method for rehabilitating an existing pipe according to claim 1, wherein the buoyancy layer is a lightweight portion that surrounds the outer peripheral surface of the cable protection pipe.   2. The existing pipe rehabilitation method according to claim 1, wherein the buoyancy layer is composed of a lightweight part that surrounds the outer peripheral surface of the cable protection pipe and a protection part that covers the lightweight part. Rehabilitation method.

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