Method for manufacturing pipe-lining material

Abstract

A method is proposed for manufacturing a pipe-lining material comprising a tubular resin absorbent material covered with a tube comprised of an airtight plastic film. The tubular resin absorbent material is inserted into the tube, expanded in a columnar shape, and brought into close contact with the internal peripheral surface of the tube. A heater is wound in close contact with the external peripheral surface of the tube thus expanded. The tube and the tubular resin absorbent material are heated by energizing the heater, and the tube is thereby heat-fused to the tubular resin absorbent material. With such a method, a mechanism for moving the tube and the tubular resin absorbent material is not required. In addition, since heat non-uniformities are not generated, the tube can be uniformly heat-fused to the tubular resin absorbent material, thereby enabling a high-quality pipe-lining material to be manufactured.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for manufacturing a pipe-lining material for lining a deteriorated existing pipe.[0003]2. Description of the Related Art[0004]Pipe channel lining methods are used for repairing an existing pipe without unearthing the existing pipe in the case that the underground existing pipe such as a clean water pipe, sewage pipe, or the like has deteriorated. With this method, the pipe-lining material composed of a tubular resin absorbent material in which a thermosetting resin has been impregnated is inserted into an existing pipe by eversion or drawing, and is expanded by air pressure or the like and held in a state that the pipe-lining material is pressed against the internal peripheral surface of the existing pipe. In this state, the pipe-lining material is heated, and the thermosetting resin impregnated in the tubular resin absorbent material is cured to line the existing pipe (e.g., Ja...

AI Technical Summary

Benefits of technology

[0011]In the present invention, the heater is wound in close contact with the external peripheral surface of the tube that coves the tubular resin absorbent material. The tube and the tubular resin absorbent material are then heated by energizing the heater, so that the tube is heat-fused to the tubular resin absorbent material. Therefore, a mechanism for moving the tube and the tubular resin absorbent material is not required, and the tube can be uniformly heat-fused to the tubular resin absorbent material without generating heating non-uniformities, thereby manufacturing a high-quality pipe-lining material in a simple manner.

[0012]In the present invention, the tube and the tubular resin absorbent material can be heated without waste, and the tube can be efficiently heat-fused to the tubular resin absorbent material using a small amount of power because the heater is wound in close contact with the external peripheral surface of the tube.

Problems solved by technology

Without such movement, the distance from the heater to the tube and the tubular resin absorbent material differs in the upper part and the lower part of the furnace, so that non-uniformities are generated in heating and thereby the tube cannot be uniformly heat-fused to the tubular resin absorbent material.

When heat-fusion is insufficient, there is a problem that the resin impregnated in the tubular resin absorbent material is not adequately cured and thereby reliable lining becomes unavailable.

These cause another problem that wasteful heating and power consumption is inevitable.

Images