JPS60252884A - Method of laying resin pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a method for easily laying a long resin pipe with curls, particularly a pipe having a resin heat insulating layer or a large size pipe, along a desired route.

[Prior art]

Resin pipes, such as polyethylene pipes, crosslinked polyethylene pipes, polybutene pipes, soft or hard polyvinyl chloride pipes, nylon pipes, etc., have considerable bending stress at room temperature, even though they are flexible. Therefore, when installing a long pipe with curls, apply an external force or partially heat the pipe to remove the curls and make it straight. Methods such as adding cables and installing them are being adopted.

However, these conventional methods require a considerable amount of manpower and have the problem that the finished appearance of the laid layer is not satisfactory due to insufficient removal of curling curls. This is particularly problematic in pipes having a heat-retaining layer, since it is virtually impossible to remove curls by heating from the outside.

[Structure of the invention]

The present invention proposes a novel installation method that solves the above problems, and involves softening a long resin pipe with curls by passing it through a high-temperature heating medium, and then installing it along a desired route. This is a characteristic feature.

The temperature of the heat medium or the pipe heating temperature by the heat medium is determined as appropriate depending on the type of target pipe. For example, in the case of cross-linked polyethylene pipes, it is appropriate to use a heat medium of 60 to 120°C, and in the case of polyvinyl chloride pipes, it is appropriate to use a heat medium of 40 to 80°C. For pipes that soften well at temperatures around 100° C., for example, crosslinked polyethylene pipes with a gel fraction of at least 30% by weight, it is desirable to use high-pressure steam as the heat medium. In that case, the necessary heating and softening can be carried out very easily at the pipe installation site using a portaple-type high-pressure steam generating material, such as the Mini Steam Cleaner manufactured by Joshu Steam Cleaner ■.

In the present invention, the pipes may be heated and softened by passing a heat medium through them in the bundled or drum-wound state, and then drawn out and installed, or alternatively, the pipes may be drawn out first and then the heat medium passed through them. From the viewpoint of thermal efficiency, it is better to heat and soften the material while it is bundled or drum-wound.

〔Effect of the invention〕

By heating and softening the resin pipe as described above, curls can be removed, and while the resin pipe is kept at high temperature, it can be bent freely with a small amount of force, so it can be shaped into the desired shape.
It is possible to lay a route. It is especially effective when applied to pipes having an external heat insulating layer made of glass wool, foamed resin, or other heat insulating materials, or to large crosslinked polyethylene pipes with an inner diameter of 501+++++ or more.

patent applicant Dainichi Nippon Electric Cable Co., Ltd. Representative representative opponent Yukio Aoyama

Claims (1)

[Claims] 1. A method for laying a resin pipe, which comprises passing a long resin pipe having curls through a high-temperature heating medium to soften it, and then laying it along a desired route. 2. The installation method according to claim 1, wherein the resin pipe is a crosslinked polyethylene pipe having a heat insulating layer on the outside. 3. Claims 1 and 2 installation methods in which the heat medium is water vapor.