JP4646795B2 - Pipeline lining method - Google Patents

Description

  The present invention relates to a method for lining for the purpose of repairing or reinforcing mainly pipes buried underground, such as gas pipes, water pipes, sewer pipes, laid pipes such as power lines and communication lines. It is.

  In recent years, as a method for lining pipes of this kind, a lining material in which a flexible airtight layer is formed on the outer surface of a fiber layer such as a cylindrical woven fabric is impregnated with a reactive curable resin liquid in the fiber layer, and the inner side is applied by fluid pressure. The inside of the lined material is inflated with the fluid pressure, and the reaction-curing resin liquid is cured to form a rigid lining along the inner surface of the line. The way to be done.

  Also, in such a lining method, a flexible tube is inserted in advance in the pipeline, and the curable resin liquid is removed from the damaged or branched portion of the pipeline by inserting the lining material into the tube while turning it over. It is also possible to prevent leakage and the situation where the lining material does not harden sufficiently, as disclosed in, for example, Japanese Patent Application Laid-Open Nos. 1-182025 and 6-143424.

  Thus, in this type of method, a nylon tube is most suitable as the tube. That is, nylon has high strength and heat resistance, can support expansion due to the internal pressure of the lining material in the above lining method, and can sufficiently withstand the heat when the reaction curable resin liquid is cured. it can. Further, a tube having an arbitrary diameter and thickness can be easily formed by inflation molding.

  However, as a characteristic of nylon, there is a problem that adhesion to an epoxy resin or an unsaturated polyester resin as a reaction curable resin is extremely poor.

  On the other hand, when a branch pipe is attached to the pipe line, the lining material closes the branch portion by applying a lining to the pipe line. Therefore, after lining the pipe line, the lining material of the branch part is perforated. It is necessary to connect the branch pipe to the pipe line.

  The drilling is often done from the inside of the pipeline or from the side of the branch pipe by drilling the lining material closing the branch, but as mentioned above, the nylon tube has poor adhesion, so the drill is made of nylon. When the tube is touched, the tube is peeled off from the lining material, so that the tube cannot be perforated neatly.

A polyester resin having a heat resistance comparable to that of nylon is excellent in adhesion to a reaction-curable resin, but is not preferable because inflation molding is difficult and expensive compared to nylon.
Japanese Patent Laid-Open No. 1-182025 JP-A-6-143424

  The present invention has been made in view of such circumstances, and a flexible tube is inserted into a conduit, and a lining material impregnated with a reaction curable resin liquid is inserted into the tube while being turned over by fluid pressure, and the reaction is performed. In the method of curing a curable resin liquid to form a rigid FRP tube inside a pipeline and lining the tube, the tube is mainly made of nylon and firmly adhered to the reaction curable resin in the lining material. The object of the present invention is to make it possible to perforate cleanly without causing the tube to peel off from the lining material even when perforating at the branching portion later.

  Thus, the present invention provides a lining material in which a flexible tube is inserted into a pipe line, a flexible airtight layer is formed on the outer surface of the cylindrical fiber layer, and the fiber layer is impregnated with a reaction curable resin liquid. Is inserted inside the tube while being turned upside down by fluid pressure, and the inside of the pipe line is cured by curing the reaction-curing resin liquid while inflating the turned lining material by the fluid pressure. In this method, the tube has an outer layer made of nylon resin and an inner layer made of ethylene-vinyl acetate copolymer resin, and the outer layer and inner layer are integrated. It is characterized by that.

  According to the present invention, since the tube has a multilayer structure having an outer layer of nylon resin and an inner layer of ethylene-vinyl acetate copolymer (EVA) resin, the outer layer of nylon can withstand the heat during lining and has the necessary strength. While being held, the EVA resin of the inner layer is melted or softened by the heat during the lining, and the nylon of the outer layer and the lining material can be firmly bonded.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state where a lining is applied to a pipe line 1 by the method of the present invention. 2 is a pressure vessel for the lining, a base 3 is formed at the tip thereof, an introduction port 4 is formed at the rear, and the pressure vessel 2 is penetrated from the introduction port 4 to the base 3, A flexible lining material 5 that is folded flat is inserted, and the tip of the lining material 5 is folded outward and fixed to the base 3 in an annular shape. Reference numeral 6 denotes a seal member that holds the inlet 4 in an airtight manner.

  The lining material 5 is formed by forming an airtight layer on the outer surface of a fiber layer such as a tubular woven fabric. A reactive curable resin liquid is injected into the lining material 5 and impregnated in the fiber layer. Yes. On the other hand, a flexible tube 7 is inserted into the conduit 1.

  When the pressure fluid is fed from the pressure fluid inlet 8 of the pressure vessel 2 in this state, the lining material 5 is turned over so that the inner side is the outer side at the annular fixing portion to the base 3, and a folded portion 5a is formed. While pulling the non-inverted lining material 5 from the introduction port 4, the lining material 5 is turned over so that the inner side is the outer side in the folded portion 5 a, and the folded portion 5 a protrudes from the base 3.

  The folded portion 5a is introduced into the tube 7, and the inside of the tube 7 is advanced, the lining material 5 is turned over the entire length and inserted into the tube 7, and the reversed lining material 5 is inserted into the fluid. It is inflated by pressure and pressed against the inner surface of the pipe line 1 through the tube 7.

  The lining material 5 is turned over the entire length, inserted into the tube 7 and inflated, the reaction curable resin liquid impregnated in the fiber layer is cured, and a strong FRP pipe is formed on the inner surface of the pipe line 1. Form. This state is shown in FIG.

  Thus, in the present invention, the tube 7 has at least two layers including an outer layer made of nylon resin and an inner layer made of EVA resin. FIG. 3 shows an example of the tube 7. An outer layer 9 made of nylon resin is formed on the outermost surface, and an inner layer 10 made of EVA resin is formed on the innermost surface.

  The outer layer 9 in the tube 7 prevents the reaction curable resin liquid impregnated in the fiber layer of the lining material 5 from flowing out from the damaged portion of the pipe line during lining, and maintains the shape of the lining material 5 under heating. Therefore, it is necessary to have sufficient strength even under heating for the lining, and the thickness is suitably 0.05 to 0.2 mm.

  Since the inner layer 10 is for bonding the lining material 5 and the outer layer 9 of the tube 7, it is necessary to be able to firmly bond both of them, and the thickness is about 0.05 to 0.2 mm. Is appropriate.

  In the present invention, nylon resin having high strength and excellent heat resistance is used as the outer layer 9 of the tube 7. Therefore, the tube 7 can sufficiently withstand the heat during lining, and from the damaged part of the pipe line. The reaction curable resin liquid can be prevented from flowing out and the shape of the lining material 5 can be maintained.

  Further, as the inner layer 10 of the tube 7, an EVA resin that is easily melted by heat and exhibits an adhesive force is used. Therefore, the EVA of the inner layer 10 is melted or softened by the heat during the lining, and the inner lining material 5 Adhere strongly.

  Therefore, according to the present invention, the nylon outer layer 9 withstands the heat during lining and maintains the necessary strength, prevents the reaction-curing resin liquid from flowing out and maintains the form of the lining material 5, and Even when the EVA resin of the inner layer 10 is melted or softened by heat, the tube 7 is firmly bonded to the lining material 5 and the lining material 5 is perforated at the branch portion of the pipeline, the tube 7 is not peeled off and is clean. Can be perforated.

Central longitudinal sectional view showing the state of lining the pipe line according to the present invention Cross-sectional view of a pipeline lined by the method of the present invention Expanded longitudinal sectional view of the tube in the present invention

Explanation of symbols

1 pipeline 5 lining material 7 tube 9 outer layer 10 inner layer

Claims (1)

A flexible tube (7) is inserted into the pipe line (1), a flexible airtight layer is formed on the outer surface of the cylindrical fiber layer, and the fiber layer is impregnated with a reactive curable resin liquid ( 5) is inserted into the tube (7) while being turned upside down by the fluid pressure, and the reaction-curing resin liquid is cured while the lining material (5) is inflated by the fluid pressure. In the method of forming a rigid FRP pipe on the inside of the pipe line (1) and lining it, the tube (7) comprises an outer layer (9) made of nylon resin, and an ethylene-vinyl acetate copolymer resin. possess a more becomes the inner layer (10), characterized in that its outer layer (9) and inner layer (10) are integrated, the conduit the method of lining

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