A glass fiber reinforced pert pipe is a prefabricated direct-buried thermal insulation plastic pipe and its preparation method

Abstract

The invention relates to a prefabricated directly-buried thermal-insulating plastic pipe taking a glass fiber reinforced PERT pipe as a working pipe. The prefabricated directly-buried thermal-insulating plastic pipe comprises a working inner pipe and an outer sheath pipe; the working inner pipe is the glass fiber reinforced PERT pipe and is connected with the outer sheath pipe through a thermal-insulating layer; the outer sheath pipe is an HDPE pipe. According to the prefabricated directly-buried thermal-insulating layer plastic pipe taking the glass fiber reinforced PERT pipe as the working pipe, provided by the invention, not only can the advantages of long service life, no corrosion, easiness in mounting and the like of a traditional prefabricated directly-buried thermal-insulating plastic pipe be kept, but also the design stress of the working pipe can be greatly improved, and the rigidity of the plastic pipe can be improved.

Description

technical field [0001] The invention belongs to the technical field of plastic pipes, and in particular relates to a method for preparing a prefabricated direct-buried thermal insulation plastic pipe in which a glass fiber reinforced PERT pipe is a working pipe. Background technique [0002] In the northern cities of my country, the energy consumption of the heating system accounts for about 20% of the total energy supply. The traditional heating system pipe network is mainly composed of prefabricated direct-buried thermal insulation composite pipes whose working pipes are steel pipes. However, steel pipes are easy to corrode at high temperatures, have a short lifespan, and have high heat loss, which is not conducive to energy saving, and the long-term use of joints is prone to hidden safety hazards in heating. Therefore, pipeline manufacturers are developing prefabricated direct-buried thermal insulation composite pipes with plastic pipes as the working inner pipe to repla...

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Problems solved by technology

However, in the process of promoting prefabricated direct-buried thermal insulation plastic pipes, two problems emerged: 1. Under the same design conditions, the cost price of plastic pipes is more than twice that of steel pipes, which greatly limits the use of prefabricated direct-buried thermal insulation plastic pipes. The promotion and application of pipes; 2. The thermal expansion coefficient of plastic pipes is 10 times that of steel pipes. When installing prefabricated direct-buried thermal insulation plastic pipe network systems, more expansion space must be reserved than steel pipes, which increases the cost of thermal insulation plastic pipe networks.

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