JP2006044160A - Method for rehabilitating existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rejuvenate an existing pipe with a protecting layer formed of a heat-fusing resin such as tar, coated on the inner surface of the pipe to the state of a successfully finished duct. <P>SOLUTION: In rehabilitating the existing pipe 12 with a protecting layer formed of tar or the like, coated on the inner surface of the pipe, e.g. paper pipe, a pretreatment to thermally soften the protecting layer on the inner surface of the pipe by introducing a heating medium such as steam inside the existing pipe 12, then a rehabilitating material 1 is heated/pressurized in the state that the rehabilitating resin pipe 1 is inserted into the existing pipe 12 and the inner surface of the existing pipe 12 is lined with the rehabilitating resin pipe 1, while making the inner surface smooth. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a method for rehabilitating an existing pipe, such as a sewer pipe, which is used to rehabilitate an old pipe (hereinafter referred to as an existing pipe), and in particular, a protection made of a heat-melting resin such as tar on the inner surface of a pipe such as a paper pipe. The present invention relates to a method for rehabilitating an existing pipe coated with a layer.

  As a method for rehabilitating an existing pipe, a method of lining the inner surface of an existing pipe with a thermoplastic resin or a fiber reinforced resin is generally known.

  Further, as a method of lining an existing pipe with a regenerated material made of thermoplastic resin, for example, a thermoplastic resin pipe having an outer diameter equal to or slightly smaller than the inner diameter of the existing pipe is used as the regenerated material, and the thermoplastic resin pipe is There is a method of inserting into an existing pipe and then bringing the thermoplastic resin pipe into close contact with the inner surface of the existing pipe by heating and pressurizing (for example, see Patent Document 1).

  By the way, as an existing pipe, there is a paper pipe body in which a pipe body is a paper pipe and an inner surface of the paper pipe is coated with a tar layer. When such an existing pipe made of paper is aged, water accumulates at the interface between the paper layer and the tar layer due to the external water pressure, and the tar layer becomes blistered (uneven shape) (see FIG. 9A). For this reason, when rehabilitating with a thermoplastic resin pipe (rehabilitated pipe), etc., the existing pipe is subjected to high-pressure washing as a pretreatment, and after blistering out the blistered part, the existing pipe is rehabilitated. ing.

However, since the pretreatment by high-pressure washing is a treatment for destroying the blister portion, the blister portion cannot be completely removed and it is difficult to obtain a good finished state. In addition, when the high-pressure cleaning is performed excessively, as shown in FIG. 9B, not only the tar layer but also the paper tube may be broken (break-through broken). If even the paper tube is destroyed in this way, the ground may be shaved, causing depression.
JP 2002-264217 A

  The present invention has been made to solve the above problems, and an existing pipe whose inner surface is coated with a protective layer made of a hot-melt resin such as tar is formed into a pipe having a good finished state. It aims at providing the rehabilitation method of the existing pipe which can be rehabilitated.

  The existing pipe rehabilitation method according to the present invention is an existing pipe whose inner surface is coated with a protective layer made of a hot-melt resin such as tar (for example, an existing pipe whose inner surface is coated with a protective layer made of tar) ), A heating medium (for example, steam) is introduced into the existing pipe and a pretreatment is performed to soften the protective layer on the inner surface of the pipe by heat, and then the resin-made cylindrical rehabilitation material is It is characterized by inflating the rehabilitation material and bringing it into intimate contact with the inner surface of the existing tube by heating and pressurizing the rehabilitation material while being inserted into the existing tube.

In this way, a heating medium such as steam is introduced into the pipe of the existing pipe whose inner surface is coated with a protective layer made of a heat-melting resin such as tar, and the blister part such as tar on the inner face of the pipe is softened by heat. Then, when the tubular rehabilitation material is inserted into the existing pipe and heated and pressurized, the softened blister part is pushed back toward the inner surface of the pipe by the rehabilitation material that expands due to the heating and pressure. The inner surface of the existing pipe becomes smooth, and the pipeline can be renewed in a good finished state.

  According to the present invention, when rehabilitating an existing pipe whose inner surface is coated with a protective layer made of a heat-melting resin such as tar, a heating medium is introduced into the existing pipe so that the protective layer on the inner surface of the pipe is heated. After the pretreatment to soften, the regenerated material is heated and pressurized with the resin-made tubular rehabilitation material inserted into the existing pipe. The existing pipe can be rehabilitated in a good finished state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In this example, as shown in FIGS. 1 to 7, the attachment pipe (existing pipe) 12 laid between the main pipe 11 buried in the ground and the eaves 14 is rehabilitated using the rehabilitation pipe 1. The case will be described. Further, the target attachment tube is a tube body in which a tar layer is coated on the inner surface of a paper tube.

-Explanation of rehabilitation pipe-
As a material constituting the rehabilitation pipe 1, for example, a tin-based or lead-based stabilizer 1 is added to 100 parts by weight of a vinyl chloride resin such as a vinyl chloride resin having an average polymerization degree of 1000 to 1400 or an acrylic graft-modified vinyl chloride resin. ~ 6 parts by weight, 10-20 parts by weight of one or more thermoplastic elastomers of acrylic rubber, nitrile rubber or ethylene-vinyl acetate polymer, other additives (lubricants, processing aids, pigments, etc.) 1 Use 5 parts by weight. The vinyl chloride resin material has a Tg of 30 to 80 ° C. In addition, the rehabilitation pipe | tube 1 used for the rehabilitation of the attachment pipe | tube 12 is wound up by the winder (not shown) by the elliptical shape.

-Explanation of rehabilitation method-
Next, a specific example of the rehabilitation method of the present invention will be described for each step.

[Preprocessing]
Low pressure cleaning in the mounting tube 12 is performed to remove dirt and the like on the inner surface of the tube. Next, as shown in FIG. 1, the tip of the air supply hose 23 connected to the steam / air generating unit 22 is disposed in the attachment pipe 12, and the steam is sent into the attachment pipe 12. When steam is fed into the mounting pipe 12 in this way, oil or the like attached to the inner surface of the mounting pipe 12 is removed. Furthermore, the tar layer on the inner surface of the tube is softened by the heat of the steam, and the blister portion of the tar layer is pushed back when heating and pressurizing and expanding the rehabilitation tube described later.

[Tube saddle pasting process]
As shown in FIG. 2, the saddle sticking machine 21 on which the pipe mouth saddle 4 is placed is arranged inside the main pipe 11, and then the position of the pipe mouth saddle 4 and the attachment pipe 12 is aligned, and then the saddle sticking machine is used. 21 is driven to raise the tube opening saddle 4, and the tube opening saddle 4 is attached to the tube opening of the attachment tube 12 with the neck portion of the tube opening saddle 4 being inserted into the attachment tube 12. A waterproof rubber sheet is pasted on the outer surface of the tube opening saddle 4.

[Preheating]
The rehabilitation pipe 1 is pulled out from the winder, and cut by a predetermined length longer than the attachment pipe 12 that performs the rehabilitation. Next, as shown in FIG. 3, the tip jig 2 is attached to one end (tip) of the rehabilitated tube 1, and the tube end plug 3 is attached to the other end (rear end). The pipe end plug 3 is used to seal the rehabilitation pipe 1 at the time of steam injection and air injection, and has a structure in which an air supply hose 23 for supplying steam and air and a drain hole 24 can be connected. ing.

  And as shown in FIG. 3, while covering the rehabilitation pipe | tube 1 with the heat insulating sheet | seat 5, the state which connected the air supply hose 23 and the draining hose 24 from the steam | air end generation unit 22 to the pipe end plug 3, By feeding steam into the rehabilitation pipe 1 and preheating the rehabilitation pipe 1, the rigidity of the rehabilitation pipe 1 is lowered to such an extent that it can be easily deformed by human power.

  In addition, when it takes time to preheat the rehabilitation pipe 1 and apply the above-described tube-end saddle, the above-described pretreatment (introduction of steam into the attachment pipe 12) is performed in parallel with these processes, The softened state of the tar layer (blister portion) on the inner surface of the tube is maintained.

[Rehabilitation pipe drawing process]
As shown in FIG. 4, a winch 25 is installed on the manhole 13 of the main pipe 11, and the wire 6 is drawn into the main pipe 11 through the manhole 13 from the winch 25, and is passed through the wire guide (pulley) 27 and the retractor 26. Then, the wire 6 is passed through the attachment tube 12 and the tip of the wire 6 is connected to the tip jig 2 of the rehabilitation tube 1. Next, the rehabilitation pipe 1 is pulled through the wire 6 by the winch 25, and the rehabilitation pipe 1 is drawn from the side of the ridge 14 side. During retraction, in order to reduce the load on the retraction machine 26, retraction is performed while the rehabilitation pipe 1 is pushed in manually from the side of the flange 14. Then, when the tip of the rehabilitation pipe 1 protrudes from the attachment pipe 12 to the inside of the main pipe 11 by a predetermined amount (for example, 50 mm or more), the drawing operation is completed.

[Rehabilitation pipe heating / pressurizing diameter expansion process]
After the retraction operation of the rehabilitating pipe 1 into the mounting pipe 12 is completed, the air supply hose 23 and the drain hose 24 are reconnected to the pipe end plug 3 at the rear end of the rehabilitation pipe 1 as shown in FIG. To do. In this state, high-temperature and high-pressure steam is supplied from the steam / air generating unit 22 to the inside of the rehabilitation pipe 1 through the air supply hose 23 to heat the rehabilitation pipe 1 (heating to reach an outside surface temperature of 80 to 85 ° C., for example). ) Next, air (compressed air) is supplied from the steam / air generating unit 22 through the air supply hose 23 to the inside of the rehabilitation pipe 1 to expand the rehabilitation pipe 1. By such heating / expansion, as shown in FIG. 6, the rehabilitation pipe 1 is greatly expanded, and the inner surface of the attachment pipe 12 is lined with the rehabilitation pipe 1. In addition, when the rehabilitation pipe 1 is expanded (expanded diameter), the blister portion of the tar layer of the mounting pipe 12 is pushed back toward the inner surface of the paper pipe, so that as shown in FIGS. 8 (A) and (B) As a result of the smooth inner surface of the tube 12, the mounting tube 12 can be renewed in a good finished state.

  In this example, after heating with steam, air is supplied into the rehabilitation pipe 1 to expand the rehabilitation pipe 1, but instead, heating the rehabilitation pipe 1 with steam supplied into the rehabilitation pipe 1. And both pressurization and pressurization may be performed.

[Rehabilitation pipe end treatment process]
As shown in FIG. 7, the cutting machine 28 is carried into the main pipe 11, and the rehabilitation pipe which has driven the cutting machine 28 in a state where the blade 28a of the cutting machine 28 is fixed at a position where the tip of the rehabilitation pipe 1 can be cut. Cut the tip of 1. On the other hand, the end portion (rear end) of the rehabilitating pipe 1 on the side of the ridge 14 is cut using a cutting machine such as a grinder, and after this cutting is completed, between the tube wall of the retreaded pipe 1 and the ridge 14 Finish using resin mortar or mortar so that there is no level difference.

  Here, in the above example, the method of softening the blister portion of the tar layer on the inner surface of the mounting pipe 12 using the heat of steam in the pretreatment step is adopted, but the present invention is limited to this. Instead, for example, another heating medium such as warm air may be sent into the attachment tube 12 to soften the blister portion of the tar layer.

The rehabilitation method of the present invention can be applied to rehabilitation of existing main pipes buried in the ground in addition to rehabilitation of mounting pipes.

  The present invention is effectively used for rehabilitating existing pipes such as sewage pipes, especially existing pipes coated with a protective layer made of heat-melting resin such as tar on the inner surface of paper pipes and the like. Can do.

It is explanatory drawing of the pre-processing of an attachment pipe. It is explanatory drawing of the sticking process of a tube opening saddle. It is explanatory drawing of the preliminary overheating of a rehabilitation pipe | tube. It is explanatory drawing of the drawing-in process of a rehabilitation pipe | tube. It is explanatory drawing of the heating and pressurization diameter expansion process of a rehabilitation pipe | tube. It is explanatory drawing of the heating and pressurization diameter expansion process of a rehabilitation pipe | tube. It is explanatory drawing of the edge part process process of a rehabilitation pipe | tube. It is operation | movement explanatory drawing of this invention. It is explanatory drawing of the problem at the time of carrying out the high pressure washing | cleaning of the existing pipe | tube with which the inner surface of the paper pipe | tube was coated with the tar layer.

Explanation of symbols

1 Rehabilitation pipe (rehabilitation material)
2 Tip jig 3 Pipe end plug 4 Pipe port saddle 11 Main pipe 12 Mounting pipe 13 Manhole 14 桝 21 Saddle pasting machine 22 Steam / air generating unit 23 Air supply hose 24 Drain drain hose 25 Winch 26 Retractor 27 Wire guard 28 Cutting Machine 28a blade

Claims (2)

  A method of rehabilitating an existing pipe whose inner surface is coated with a protective layer made of a heat-meltable resin, in which a heating medium is introduced into the existing pipe and pretreatment is performed to soften the protective layer on the inner surface of the pipe with heat. After that, the existing pipe is characterized by inflating the rehabilitation material and bringing it into close contact with the inner surface of the existing pipe by heating and pressurizing the rehabilitation material in a state in which the resin-made cylindrical rehabilitation material is inserted into the existing pipe. Rehabilitation method. The method of rehabilitating an existing pipe according to claim 1, wherein the existing pipe whose inner surface is coated with a protective layer made of tar is rehabilitated.

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