The plastic composite pipe with steel wire mesh framework is made of high-strength steel wire twisted left and right as the reinforcement, high-density polyethylene as the matrix, and high functional adhesive resin layer is used to closely connect the steel net framework with the internal and external high-density polyethylene. It not only has the characteristics of anti-corrosion, no scaling, smoothness, heat preservation, no wax deposition, abrasion resistance, light weight and other plastic pipes, but also its common structure has created the following characteristics:
1. Good anti snag function and high durable mechanical strength: because plastic will undergo end deformation under normal temperature and stress effect, and brittle fracture will occur under high durable stress effect, the allowable stress and bearing capacity of pure plastic pipes are very low (generally 1 OMPa). The mechanical strength of steel is about 10 times that of thermoplastics, and it is very stable within the temperature range of plastics. After the steel mesh skeleton is compounded with plastics, the steel mesh skeleton can effectively restrain the creep of plastics, making the durability of plastics greatly improved. As a result, the allowable stress of the plastic composite pipe with wire mesh framework is twice that of the plastic pipe.
2. It has good rigidity, impact resistance, good dimensional stability, and moderate flexibility. The elastic molding compound of steel with rigidity and flexibility is usually about 200 times the elastic modulus of high-density polyethylene, because the reinforcement effect of wire mesh skeleton makes the rigidity, impact resistance, and dimensional stability of plastic composite pipe with wire mesh skeleton because of any kind of pure plastic pipe. Because the wire mesh framework itself is a flexible structure, the composite pipe is also flexible in the axial direction. Therefore, the pipe has the advantages of rigid flexible combination, and is excellent in unloading, transportation, device adaptability and operation reliability. The ground device can save the number of supports, and the cost is low; Underground devices can effectively accept sudden impact loads caused by settlement, sliding, vehicles, etc. Small diameter pipes can be properly bent and arranged according to topographic relief or serpentine layout to save pipe fittings.
3. Small thermal expansion coefficient: under the constraint of the steel mesh framework, the thermal expansion of the composite pipe is greatly improved, lower than any common plastic pipe. The test results show that the thermal compensation device is generally not required when buried pipe devices, and the pipe can be absorbed (or released) by winding laying, Thus, the cost of the device is reduced.
4. Rapid cracking will not occur: under the effect of durable circumferential stress at low temperature, pure plastic pipes, especially large diameter pure plastic pipes, are prone to rapid cracking caused by local defects and stress concentration. Therefore, at present, international L has put forward high requirements on the anti rapid cracking function of pipe plastics, while low-carbon steel does not have the problem of brittle fracture, The plastic deformation and stress will not reach the critical point of rapid cracking due to the existence of steel mesh. Therefore, theoretically, there is no rapid cracking of the steel mesh skeleton plastic composite pipe.
5. The composite of steel and plastic materials is even and reliable: because the composite surface between steel and plastic is a continuous and regular interface, the steel plastic composite bamboo in the market is easy to delaminate under the effect of alternating stress for a long time, resulting in N leakage at the junction. In contrast, the steel wire mesh skeleton plastic composite pipe is a mesh structure with special hot-melt adhesive to make the plastic and steel wire mesh closely combined and seamless. The two materials have large and uniform binding force on each other, and the stress concentration is small.
6. Double sided anti-corrosion: the steel wire mesh framework is compounded in the plastic by special hot melt adhesive, and the inner surface of the pipe has the same anti-corrosion function. It is wear-resistant, the inner wall is smooth, the transmission resistance is small, no scaling, no wax, and the energy-saving effect is significant. It is more economical and convenient for underground transportation and corrosive environment conditions.
7. Good self tracing: because of the existence of the steel wire mesh framework, the buried steel wire mesh framework plastic composite pipe can be located by the usual magnetic exploration method to avoid damage caused by other excavation operations.
