JP2015199280A - Renovation method of pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extremely easy renovation method of a pipeline, without requiring to block a hard plastic liner difficult to handle because a flexible tube is sealed after the tube is fitted to the tip of the liner inserted into the pipeline.SOLUTION: A renovation method of a pipeline for installing a liner 4 made of hard thermoplastic material in a pipeline 1 includes the steps of: air-tightly fitting a tube 6 having airtightness and flexibility to the outer periphery of the tip of the liner 4; inserting the liner 4 pressed down flat and bent into an approximately U-shape into the pipeline 1, hermetically sealing the free end of the tube 6 at the liner 4 projecting from the pipeline 1, heating the liner 4 to be softened, and introducing a pressure fluid into the liner 4 to expand along the inner surface of the pipeline 1.

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating a pipeline, and in particular, a method for constructing a pipeline by installing a liner made of a rigid thermoplastic inside the pipeline and forming a tube in the pipeline. It is about.

  Conventionally, as a method of repairing existing pipes buried in the ground such as water and sewage pipes and gas pipes, a flexible liner is turned over with fluid pressure and pulled into the pipe, and the fluid pressure causes the pipe to enter the inner surface of the pipe. A method of bonding was known.

  However, in recent years, as described in JP-A-2-202431, a relatively rigid thermoplastic pipe such as polyethylene or polyvinyl chloride is used as a liner, and this is drawn into the pipe and heated. A method of rehabilitating the pipeline by softening and closely contacting the inner surface of the pipeline is adopted.

  However, after drawing the liner into the pipeline, it is necessary to feed and pressurize and heat the heated and pressurized fluid into the liner. For that purpose, it is necessary to block the end of the liner once. In the above method, since the liner is rigid, it is extremely difficult to close the end of the liner.

  In JP-A-5-50503, an oblong plug body is pushed into the end of a plastic tube, and is clamped and fixed in the thickness direction of the plug body with clamp fittings. The portion tends to be insufficiently adhered to the plastic tube, the opening of the plastic tube cannot be completely sealed, and the pressure fluid cannot be completely prevented from leaking out of the plastic tube.

  In addition, in order to send a cooling fluid into the liner in order to cool the liner after feeding the heated pressurized fluid into the liner or after rehabilitating the pipeline, the fluid enters and exits at the closed part of the end of the liner. Although it is necessary to attach a pipe, there is a possibility that the sealability of the liner by the plug body may be insufficient in the method of passing the hose for fluid in and out through the plug body as described in the above publication.

JP-A-2-202431 Japanese Patent Laid-Open No. 5-50503

  The present invention has been made in view of such circumstances, and in the method of rehabilitating a pipeline with a liner made of a rigid thermoplastic as described above, the end of the pipeline is appropriately closed, and the pipeline can be easily closed. It is an object to provide a method of configuring.

  Thus, the present invention relates to a pipe rehabilitation method in which a liner made of a hard thermoplastic plastic is installed in a pipe, and an airtight and flexible tube is provided on the outer periphery of the tip of the liner. The tube is inserted into the conduit in a state of being bent in a substantially U shape with the liner crushed flat, and the free end of the tube is hermetically sealed with the liner protruding from the conduit. The pressure fluid is inserted into the liner while the liner is heated and softened, and the liner is inflated to be along the inner surface of the pipeline. In the present invention, it is preferable that the tube is formed by covering a tubular fabric with a flexible rubber or plastic.

  Further, in the present invention, a cushion ring having rubber elasticity is interposed between the liner and the tube, and tightened with a metal band from the outside of the tube at the position of the cushion ring, and the liner, the cushion ring, the tube, and the metal band. Are preferably fixed with bolts and nuts.

  When the free end of the tube is hermetically sealed, it is preferable that a core body having a fluid inlet / outlet pipe is inserted into the free end of the tube and the core body is tightened from the outside of the tube to be hermetically sealed.

  According to the present invention, since a flexible tube is attached to the tip of a liner made of a hard thermoplastic, and the tube is sealed after the liner is inserted through a pipeline, the hard thermoplastic liner is difficult to handle. Therefore, the pipe line can be rehabilitated very easily.

Conceptual diagram showing the state of rehabilitating the pipeline Central longitudinal sectional view of the tip of the liner in the present invention III-III cross section in Fig. 2 with tube attached to liner 3 is a cross-sectional view of the liner of FIG. 3 bent in a substantially U shape. The center longitudinal cross-sectional view which shows the state which draws in a liner in a pipe line in this invention Center vertical cross section showing the sealed free end of the tube Front view of the tube with the free end sealed

  The present invention will be described below with reference to the drawings. FIG. 1 shows that a liner 4 is inserted between manholes 2 and 3 into a sewer pipe as a pipe 1, both ends thereof are sealed and pressure fluid is fed into the liner 4, and the liner 4 is pressed against the inner surface of the pipe 1. Shows the state.

  In the present invention, the liner 4 is made of a relatively hard thermoplastic such as polyethylene or hard polyvinyl chloride. In FIG. 1, the liner 4 is heated and softened in a pressurized fluid state. The liner 4 is pressed against the inner surface of the pipe 1.

  First, the process of inserting the liner 4 into the conduit 1 will be described. 2 and 3 show the front end portion of the liner 4. A cushion ring 5 made of a rubber elastic material is fitted on the outer side of the front end portion of the liner 4, and the outer side of the cushion ring 5 is airtight. The tube 6 having the properties is fitted.

  The tube 6 is preferably such that at least the inner surface of the tubular woven fabric is coated with a flexible rubber or plastic, and has such flexibility that it can be folded flat.

  Then, from the outside of the tube 6 at the position of the cushion ring 5, the tube 6 is fixed to the liner 4 by fastening with the metal band 7, and the liner 4, the cushion ring 5, the tube 6, and the metal band 7 are penetrated. The bolts and nuts 8 are tightened at a plurality of points over the entire circumference to be firmly fixed. The metal band 7 is made of stainless steel and can be bent easily.

  Thus, when the liner 4 is inserted into the pipe line 1, a liner 4 having a diameter 5 to 15% smaller than the inner diameter of the pipe line 1 is used. Since the cushion ring 5 and the tube 6 are attached and the diameter is increased, and the bolt nut 8 protrudes further on the outside thereof, the liner 4 is once folded flatly to be inserted into the conduit 1. In this state, it is necessary to bend it into a substantially U shape.

  Therefore, the liner 4 is heated and softened and crushed into a flat state, and further bent into a substantially U shape. At this time, the end portion of the liner 4 is similarly bent, but the liner 4, the cushion ring 5, the tube 6 and the metal band 7 are firmly fixed by the bolts and nuts 8, so that they are fixed. 4 can be curved as shown in FIG. 4, and the cushion ring 5 is interposed between the liner 4 and the tube 6, so that the airtightness between the two is kept curved. Can do.

  Then, as shown in FIG. 5, the tow rope 9 is attached to the tip of the liner 4, the tow rope 9 is pulled through the pipe 1, and the liner 4 is drawn into the pipe 1. The tow rope 9 can use a string-like object such as a rope, a string, or a belt.

  However, in this state, since the bolt nut 8 protrudes outside the tube 6, when the liner 4 is pulled into the pipe in this state, the bolt nut 8 is caught by the irregularities on the inner surface of the pipe, as shown in FIG. It is preferable that the protective cover 10 is put on the outside of the tube 6, the pulling cable 9 is inserted into the through hole 17 at the tip of the protective cover 10, and the protective cover 10 is pulled together with the liner 4.

  Thus, the liner 4 is inserted into the pipe line 1, the tip of the tube 6 projects from the pipe line, the tip of the tube 6 is closed, the heated pressurized fluid is fed from the closed part, and the heating heating is applied. The liner 4 is heated and softened with a pressurized fluid, and an internal pressure is applied to expand the liner 4 into a circular cross section and press the inner surface of the pipe line 1.

  At this time, the liner 4 and the tube 6 are hermetically connected, and the flexible tube 6 is closed. Therefore, the tip of the tube 6 can be easily closed by simply folding it flat and clamping it. Therefore, it is not necessary to take uncertain closing means such as pushing the plug into the conventional liner 4.

  When it is necessary to feed the heated and pressurized fluid through the closed portion of the tube 6, as shown in FIGS. 6 and 7, the core body 12 having the fluid inlet / outlet pipe 11 is inserted into the opening of the tube 6. The screw rod 16 is rotated by being sandwiched between a pressing body 14 having a recess 13 for fitting the core body 12 and a metal plate 15 having spring elasticity facing the pressing body 14 with the core body 12 interposed therebetween. By doing so, the tube 6 and the core body 12 are pinched between the pressing body 14 and the metal plate 15, and the tube 6 can be obstruct | occluded.

  Even in this case, the size of the core body 12 does not need to match the size of the opening portion of the tube 6, and only needs to enter the opening portion of the tube 6, and is sufficiently smaller than that. There is no problem.

  And the excess part of the opening part of the tube 6 can be folded as shown in FIG. 7, and can be pinched | interposed between the press body 14 and the metal plate 15, and airtight using the flexibility of the tube 6 It can be occluded.

  Therefore, according to the present invention, the flexible tube 6 is attached to the tip of the liner 4 made of hard thermoplastic plastic, the liner 4 is inserted through the conduit 1, and then the flexible tube 6 is folded and sealed. Therefore, it is not necessary to close the liner 4 made of hard plastic that is hard and difficult to handle, and the pipeline can be renewed very easily.

1 Pipe Line 4 Liner 5 Cushion Ring 6 Tube 7 Metal Band 8 Bolt Nut 11 Fluid In / Out Pipe 12 Core

Claims (4)

In the pipe rehabilitation method in which a liner (4) made of hard thermoplastic plastic is installed in the pipe (1), a tube having airtightness and flexibility on the outer periphery of the tip of the liner (4) ( 6) is airtightly attached to the liner (4), and is inserted into the pipe (1) in a state of being bent into a substantially U shape while the liner (4) is flatly crushed. In the liner (4) protruding from (1), the free end of the tube (6) is hermetically sealed, and the pressure fluid is inserted into the liner (4) while the liner (4) is heated and softened. And the liner (4) is inflated to be along the inner surface of the pipe (1). The method for rehabilitating a pipe line according to claim 1, characterized in that the tube (6) is formed by covering a tubular fabric with a flexible rubber or plastic. A cushion ring (5) having rubber elasticity is interposed between the liner (4) and the tube (6), and tightened with a metal band (7) from the outside of the tube (6) at the position of the cushion ring (5). The liner (4), the cushion ring (5), the tube (6), and the metal band (7) are passed through and fixed with bolts and nuts (8). Of rehabilitation When the free end of the tube (6) is hermetically sealed, a core body (12) having a fluid inlet / outlet pipe (11) is inserted into the free end of the tube (6), and from the outside of the tube (6). The method for rehabilitating a pipeline according to claim 1, 2 or 3, characterized in that the core (12) is tightened and hermetically sealed.

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