JP2011075013A - Tubular structure and method for repairing pipeline - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular structure for repairing an existing pipeline which is lightweight and high in strength. <P>SOLUTION: The tubular structure includes a block body 1 constituted of a frame body part having an arc-like plate surface and having a flange part on four sides and assembled in a tubular shape in the existing pipeline, a restriction body 3 provided in a prescribed interval along an outer axial direction of the assembled tube and fastening an outer peripheral part of the block body 1 with each other, and an outer cover 2 covering an outer side of the block body to which the restriction body is attached in the tubular shape. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tubular structure used for repairing an aged sewer pipe, an agricultural water pipe, an industrial water pipe, and a pipe repair method using the tubular structure, and more particularly, it has strength and water. The present invention relates to a tubular structure that can be floated and a pipe line repairing method that can easily assemble a tubular structure in an existing pipe line.

  Conventionally, a block body is carried into an existing pipe line to assemble a tubular structure, and a grout material such as cement mortar is filled between the outside of the tubular structure and the existing pipe line so that the pipe is aged. We are repairing.

  Grout materials such as cement mortar and resin mortar are hard, strong, and strong in bonding force, so that the wall surface of the existing pipe line is firmly bonded to the tubular structure. As a result, the existing pipe line having a reduced residual strength is restored. (See Patent Document 1)

  However, filling with grout materials such as cement mortar and resin mortar combined with existing pipelines made of concrete will increase the rigidity of the pipeline after restoration, resulting in a long inflexible tube without a joint in the middle. In addition, there is a problem that resistance to ground subsidence and ground deformation is extremely lowered. Existing pipes have seismic resistance through joints, but long inflexible pipes do not improve seismic performance, although they may reduce seismic performance.

  Conversely, it is desirable that the tubular structure has sufficient strength and flexibility. When the tubular structure is a flexible tube having sufficient strength, a grout material having a bonding force such as cement mortar or resin mortar is injected between the tubular structure and the existing structure. There is no need to connect the pipelines.

  In order to form a tubular structure having flexibility and sufficient strength, for example, the plate thickness of the block body may be increased. However, increasing the plate thickness increases the weight of the block body, makes handling difficult, and increases the material cost.

  When repairing an existing pipe line, it is difficult to construct a bypass from the viewpoint of workability, so the block body may be assembled in a state where there is service water in the existing pipe line. For this reason, it has been necessary to perform a submerged hand-joining operation. The assembly work of the block body on the upper part of the tubular structure which is not immersed in service water is desired.

JP 200397763 A

  An object of the present invention is to provide a tubular structure for repairing an existing pipe line that is lightweight and strong. It is another object of the present invention to provide a pipe line repairing method in which the assembly work of the block body can be performed on the upper part of the tubular structure not immersed in water.

  The tubular structure according to the present invention comprises a frame body portion having an arcuate plate surface and provided with a flange portion at the peripheral portion, and a block body assembled into a tubular shape in an existing pipe line, and an assembled tube A restraint body that is provided at predetermined intervals in the outer axial direction of the block body and fastens the outer peripheral portions of the block bodies to each other, and an outer surface cover that covers the outside of the block body to which the restraint body is attached.

  It is preferable that cement milk or air mortar is injected between the tubular structure and the wall surface of the existing pipeline.

  The block body preferably has a buoyancy portion filled with foamed plastic.

  A pipe line repairing method according to the present invention is a pipe line repairing method in which the tubular structure according to claim 1 is used, wherein a belt driven from the ground side is stretched over one end of the tubular structure, and the block The tubular structure is rotated so as to come to the top of the tube of the tubular structure to which the body is connected.

  According to the tubular structure according to the present invention, since the plurality of restraining bodies that are provided at predetermined intervals along the axial direction and fasten the outer peripheral portions of the block bodies assembled in a tubular shape are provided, the outer surface cover and the restraining body A triple structure composed of block bodies can be obtained, and a flexible tube having a light weight and strength can be obtained. That is, the plate thickness of the block body can be reduced. If the plate thickness is thin, the raw materials are reduced and the cost of the block body can be reduced.

  Cement milk mixed with water and cement or air mortar containing air bubbles in water, cement and admixture was injected between the walls of existing pipes, so the bonding strength and strength like conventional cement mortar is not However, it is suitable as an outer wall material of a flexible tube that is light in weight per unit volume, lightweight and strong.

  Since the buoyancy part filled with the foamed plastic is provided in the block body, the tubular structure can be made light in water in the existing pipeline.

  According to the pipe line repairing method according to the present invention, the belt is stretched over one end of the tubular structure and rotated so that the portion where the block body of the tubular structure is connected comes to the top of the pipe. It is possible to make it easy to work.

It is sectional drawing of the tubular structure by this invention. It is the A section enlarged view of FIG. It is a perspective view which shows the frame part of the block body of FIG. It is a front view of the restraint body of FIG. It is a top view of the restraint body of FIG. It is a top view which shows the B section of FIG. It is explanatory drawing which shows the assembly of the tubular structure by this invention. It is explanatory drawing in the case of rotating the tubular structure by this invention. It is explanatory drawing in the case of advancing the tubular structure by this invention. It is a flowchart which shows the pipe line repair construction method by this invention.

  Hereinafter, a tubular structure and a pipe line repairing method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a tubular structure according to the present invention. The tubular structure 100 includes a block body 1, a restraint body 3, and an outer surface cover 2. Although not shown, the tubular structure 100 has an outer wall material injected into a gap between the outer surface cover 2 and the wall surface of the existing pipe line.

  In the present embodiment, four block bodies 1 are connected to each other to form one round of the tubular structure 100. The block body 1 is also connected in the axial direction of the tubular structure 100 and assembled to a predetermined length. The block body 1 has an arcuate plate surface that is assembled into a tube.

  FIG. 2 is an enlarged view of part A in FIG. As shown in FIG. 2, the block body 1 is connected to the flange portion 21a by bolts 5a and nuts 5b. The outer surface cover 2 is attached to the top of the flange portion 21a with screws 7 and an adhesive material 8. The restraint body 3 is attached to the groove of the flange portion 21 so as to tighten the pipe.

  The thickness and height of the flange portion 21 a are set based on the outer diameter of the tubular structure 100. For example, the height of the flange portion 21a is 20 to 120 mm, and the thickness of the flange portion 21a is set to about 6 mm when it is thin, and about 30 mm when it is thick. The bolt 5a and the nut 5b are made of stainless steel, iron, or plastic depending on the application.

  FIG. 3 is a perspective view showing a frame part of the block body of FIG. The frame body part 20 is an arcuate plate that is tubular when connected to each other. As shown in FIG. 3, the frame body portion 20 has an arc shape in the left-right direction, and the front-rear direction is assembled to the pipe and becomes the axial direction of the pipe. Protruding flange portions 21 are provided at the front and rear, left and right peripheral portions (four edge portions) of the frame body portion 20. The left and right flange portions 21 a are provided with bolt through holes 9 and restraint body mounting grooves 25. Bolt through holes 9 are also provided in the front and rear flange portions 21b. The tubular structure 100 is configured by connecting the flange portions 21 of the block body 1 to each other.

  The frame body portion 20 of the block body 1 is manufactured as follows. A resin adsorbent such as a glass fiber mat or a plastic non-woven fabric is spread in the mold without any gap, and a liquid curable resin is impregnated into the resin adsorbent and cured. Polyester fiber is used for the plastic nonwoven fabric. Polypropylene, vinylon or polyamide may be used. As the curable resin, an unsaturated polyester is mainly used. Vinyl ester resin or epoxy resin may be used as the curable resin.

  The outer surface cover 2 and the restraining body 3 are also manufactured in the same manner as the frame body portion 20 of the block body 1. The restraint body 3 may use a piano wire, a wire rope, a vinylon, or a polypropylene rope or belt, etc., without depending on the method described above. The buoyancy portion 4 is provided inside the frame body portion 20 and is filled with polyethylene or polyurethane foamed plastic. The buoyancy part 4 is advantageous when moving the tubular structure 100 in an existing pipe line filled with water.

  The tubular structure 100 is manufactured so that the outer diameter is finished to about 80 to 95% of the existing pipe line to be repaired. As shown in FIG. 1, the tubular structure 100 is formed by connecting a plurality of block bodies 1. Since the block body 1 is carried from the manhole, the width is set to 50 to 90% of the inner diameter of the manhole. For example, the inner diameter of the No. 1 manhole is about 900 mm, and the No. 2 manhole is about 1200 mm. Note that the width of the block body 1 is 580 mm or less at maximum so that it can be easily handled.

  FIG. 4 is a front view of the restraint 3 of FIG. FIG. 5 is a plan view of the restraint 3 of FIG. In this example, the restraint 3 was made of glass fiber and curable resin. The restraint body 3 is made of FRP, and has connecting portions having bolt through holes 9 at both ends as shown in FIGS. After connecting the block bodies 1 in the existing pipelines to form a tubular shape, the restraining bodies 3 are attached to the outer periphery of the tubular structure 100 at a predetermined pitch in the axial direction, for example, at intervals of 100 mm. Thereby, the outer periphery of the block body 1 is firmly clamped, and the strength of the tubular structure 100 is improved.

  FIG. 6 is a plan view showing a portion B of FIG. The bolts 12a are passed through the bolt through holes 9 and fixed with nuts 12b at the connecting portions at both ends of the restraint 3. The reinforcing fiber 10 of brass fiber, carbon fiber, or vinylon is roved at the fixed portion, and the roving is cured with the curable resin 11 to form a stronger connection.

  FIG. 7 is an explanatory view showing the assembly of the tubular structure according to the present invention. The block body 1 is suspended from the manhole in the existing pipe line 50 and assembled into the tubular structure 100. The tubular structure 100 is advanced by being pulled by the tow rope 14. The block body 1 that is first attached to the tip guide 13 is alternately half-length. This makes it possible to alternate the circumferential connection. In the existing pipe line 50, a sandbag 17 held by the jack 16 is provided and is filled with water. Since the tubular structure 100 floats on the water surface by the buoyancy part 4 of the block body 1, the tubular structure 100 can be easily advanced or rotated. If water cannot be filled, beads or iron balls may be laid in the existing pipeline 50.

  FIG. 8 is an explanatory diagram for rotating the tubular structure according to the present invention. In the existing pipe line 50, the block body 1 is always connected by the pipe top part of the tubular structure 100 so that it may work easily. For this reason, a rubber belt 27 driven by the ground-side motor 30 is passed over one end of the tubular structure 100 and rotated so that the portion of the tubular structure 100 to which the block body 1 is connected becomes the top of the tube. Let

  FIG. 9 is an explanatory diagram for advancing the tubular structure according to the present invention. When the connection of the block bodies 1 proceeds, the tubular structure 100 pulls the tow rope 14 with the winch 18 and advances the existing pipe line 50 by a necessary distance. When the tubular structure 100 is laid in the existing pipeline 50, a liquid injection material is injected from an injection port (not shown) provided in the block body 1 and the outer surface cover 2.

  FIG. 10 is a flowchart showing the pipeline repair method according to the present invention. The assembly process of the tubular structure is shown in steps 1-8. In step 1, the block body 1 is suspended in the existing pipeline. In step 2, the block bodies are connected in the existing pipeline. As a result, the tubular structure is assembled. Step 3 rotates the tubular structure. Thereby, the connection part of a block body can be performed on a water surface, desirably a pipe top part. Step 4 is a determination as to whether the block body has been incorporated for one round. If not, return to step 1. If incorporated, go to step 5.

  In step 5, the constraint body is attached to the outer periphery of the block body having a tubular shape. As a result, the outer periphery of the block body can be tightened. Step 6 pulls the tubular structure forward with a tow rope. This secures a work area directly under the manhole. Step 7 is a determination as to whether the laying of the tubular structure has been completed in a predetermined section. If not completed, return to step 1. If completed, go to step 8. In step 8, cement milk or air mortar is injected into the gap between the tubular structure and the existing pipe line.

  The present invention is suitable as a tubular structure for existing pipe line repair that is lightweight and strong. Further, in the pipe line repairing method according to the present invention, the assembly work of the block body can be performed at the pipe top portion of the tubular structure which is easy to work above the water surface.

DESCRIPTION OF SYMBOLS 1 Block body 2 Outer surface cover 3 Restraint body 4 Buoyancy part 5a Bolt 5b Nut 7 Screw 8 Adhesive material 9 Bolt through-hole 10 Reinforcing fiber 11 Curable resin 12a Bolt 12b Nut 13 Tip guide 14 Pulling rope 16 Jack 17 Sandbag 18 Winch 20 Frame Body part 21 Flange part 21a Flange part (circumferential direction)
21b Flange (Axial direction)
25 Constraint body mounting groove 27 Belt 30 Motor 50 Existing pipe line 100 Tubular structure

Claims (4)

A block body having a circular arc plate surface and having a flange portion provided in the periphery, and being assembled into a tubular shape in an existing pipeline;
A restraint body provided at a predetermined interval along the outer axial direction of the assembled pipe, and tightening the outer peripheral portions of the block bodies to each other;
An outer surface cover that covers an outer side of the block body to which the restraint body is attached.
The tubular structure according to claim 1, wherein cemented milk or air mortar is injected between the tubular structure and a wall surface of an existing pipeline.
The tubular structure according to claim 1, wherein the block body has a buoyancy portion filled with foamed plastic.
A pipe line repairing method in which the tubular structure according to claim 1 is used,
A belt driven from the ground side is stretched over one end of the tubular structure, and the tubular structure is rotated so that a portion of the tubular structure to which the block body is connected comes to the top of the tube. Pipeline repair method.

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