Installation method of a waterproof electric thermal insulation joint

Abstract

The invention belongs to the field of heat preservation and relates to an installation method of a heat-preservation joint of a directly embedded high-temperature-hot-water pipe network used for heat-supply engineering, in particular to an installation method of a waterproof-type electric-melting heat-preservation joint. The method comprises following technical steps of: cleaning a working environment, installing an electric-melting sleevelet, welding gaps, foaming polyfoam, plugging a feeding port and sealing a seamless heat shrink sleeve. The installation method of the waterproof-type electric-melting heat-preservation joint has following beneficial effects: by utilizing the electric-melting sleevelet and the seamless heat shrink sleeve outside a pipeline, sealing and water-proof performance of the heat-preservation joint can be improved; through two-time heating and welding of the electric-melting sleevelet, especially transverse seam heating, engineering construction quality can be further improved, which is of great importance to improving construction quality of heat-preservation pipelines; the method is reliable in principle, easy and convenient in operation, mature in installation technology and is safe; and the waterproof-type electric-melting heat-preservation joint used in simple in structure, low in manufacture cost, user-friendly in application environment and broad in application scope.

Description

Technical field: [0001] The invention belongs to the technical field of heat supply and heat preservation, and relates to a method for installing heat preservation joints of directly buried high-temperature hot water pipe networks in heating projects, in particular to a method for installing waterproof electric heat preservation joints. The two kinds of sealing sleeves, the fusion sleeve and the seamless heat shrinkable sleeve, can ensure the sealing and waterproof performance of the thermal insulation joint, and the construction quality of the project can be further improved by two times of heating and welding of the electric heating sleeve. Background technique: [0002] Since the introduction of Nordic prefabricated direct-buried thermal insulation pipes in my country in the 1980s, the construction technology of direct-buried heating and thermal insulation pipes in China has developed rapidly. Great progress; with the popularization of high-temperature hot water pipeline d...

AI Technical Summary

Problems solved by technology

At present, when direct-buried thermal insulation pipelines are laid in areas with rich groundwater, if any part of the pipeline system is damaged from the outside, causing groundwater to enter the pipeline insulation system, the vaporization of water at high temperature will accelerate the carbonization of the polyurethane insulation layer and make it invalid, and the groundwater will directly When in contact with the steel pipe, more heat will be transferred outward and cause corrosion on the outer surface of the pipe. The high-temperature medium in the pipe will heat more groundwater, form more steam, and extend to both ends more quickly, destroying more The polyurethane insulation layer formed a vicious circle, which will eventually lead to the failure of the insulation of the entire pipeline and the corrosion of the working steel pipe by groundwater, which will bring huge economic losses and safety hazards that cannot be ignored to the heating enterprises.

In the pipeline system, the insulation pipe is generally prefabricated in the factory, and the quality is relatively easy to guarantee; while the joint insulation needs to be made on the construction site, affected by many actual construction conditions, the insulation joint is far less firm than the prefabricated insulation pipe, and becomes a heating pipe. The short board of the system

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