Reinforced prefabricated direct-buried insulation pipe

Abstract

The invention discloses a reinforced prefabricated direct-buried insulation pipe. The reinforced prefabricated direct-buried insulation pipe is characterized in that all injecting holes, exhaust holes, detecting holes and the like on a PE outer protecting pipe and an electric heating melting sleeve are provided with reinforced sealing modules; all welding lines of the PE outer protecting pipe areprovided with welding line reinforcing belts; a steel pipe fitting of an insulation pipe fitting and the PE outer protecting pipe are thicker than a steel pipe of a corresponding insulation straight pipe and the PE outer protecting pipe; the foam density of the insulation pipe fitting is larger than the foam density of the insulation straight pipe; an insulation joint adopts multiple reinforced sealing measures; a rigid waterproof end seal is added at a well chamber pipe end; and a sealing branch pipe is arranged in an alarm wire leadout point. According to an equal-life optimal design principle, the pipe network maintenance frequency is reduced, and the service life is prolonged; and the direct-buried insulation pipe with a conveying medium exceeding 120 DEG C or provided with a leakage detecting alarm system is particularly adapted to.

Description

1. Technical field: [0001] The invention belongs to building materials, and is a prefabricated direct-buried thermal insulation pipeline used for urban heat supply and petroleum transportation. 2. Background technology: [0002] At present, according to CJ / T114 and GB / T29047, "High-density polyethylene outer protection pipe rigid polyurethane foam prefabricated direct-buried insulation pipes and pipe fittings" have been widely used in hot water transportation and oil transportation in urban heating systems . As a direct-buried thermal insulation pipeline technology, my country introduced European technology and standards 40 years ago. It is a necessary standard configuration in Europe to set up a leak detection and alarm system for direct-buried thermal insulation pipelines. However, in my country, the leakage detection and alarm technology has not been effective so far. According to the analysis, the key reason is that there are many shortcomings in the insulation pipes bur...

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Problems solved by technology

As a direct-buried thermal insulation pipeline technology, my country introduced European technology and standards 40 years ago. It is a necessary standard configuration in Europe to set up a leak detection and alarm system for direct-buried thermal insulation pipelines. However, in my country, the leakage detection and alarm technology has not been effective so far. According to the analysis, the key reason is that there are many shortcomings in the insulation pipes buried in the ground, especially the strength of the PE outer protective pipe of the insulation elbow and the insufficient ability of the foam insulation layer of the insulation elbow to resist soil back pressure, and the insulation A large number of injection holes in the pipeline, the air vent hole is not tightly sealed, etc.

A large number of engineering practices have proved that in our country, the outer protection pipe of the insulation elbow of the directly buried insulation pipe buried underground is broken, and a large number of injection holes, vent holes and insulation joints are not tightly sealed, resulting in water entering the foam insulation layer and causing damage. Steel pipe subject to abnormal corrosion

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