Flame-retardant plastic-steel composite cable protection pipe and preparation method thereof

Abstract

The invention relates to a cable protection pipe and particularly discloses a flame-retardant plastic-steel composite cable protection pipe and a preparation method thereof. The cable protection pipe is formed by an inner flame-retardant pipe and an outer flame-retardant pipe which are combined into a whole, wherein the inner flame-retardant pipe is made of flame-retardant thermoplastic plastic; the outer flame-retardant pipe is a flame-retardant glass reinforced plastic pipe. The flame-retardant plastic-steel composite cable protection pipe and the preparation method thereof have the benefits as follows: the flame-retardant plastic-steel composite cable protection pipe has the characteristics of flame redundancy, resistance to heat and cold, low shrink, high strength, high compressive capacity, high resistance to foundation settlement and great heat conductivity coefficient; not only the advantages of the glass reinforced plastic pipe are brought into play but also the defects that the inner wall of the glass reinforced plastic pipe is not wear-resisting and is susceptible to fiber scattering are overcome; a cable can easily penetrate through the cable protection pipe, so that the phenomenon that a cable is stuck is avoided; the flame retardancy effect of the cable protection pipe is good, so that the possibility of a fire is lowered, and unnecessary losses are reduced.

Description

(1) Technical field [0001] The invention relates to a cable protection tube, in particular to a flame-retardant plastic-steel composite cable protection tube and a preparation method thereof. (2) Background technology [0002] There are basically two types of pipe materials used for plastic cable protection in the market, one is thermosetting plastics, mainly fiberglass pipes, and the other is thermoplastics, mainly PVC, polyethylene, and polypropylene pipes. The advantages and disadvantages of the pipes of these two types of materials are as follows: [0003] Advantages of FRP cable protection pipes: (1) FRP pipes are light in weight, high in rigidity, and strong in compressive and subsidence resistance; (2) Large in thermal conductivity, especially when the cable runs underground for a long time; (3) Weather resistance Well, the service life can reach 50 years in the environment of -40℃~150℃. FRP cable protection pipes are still the preferred pipes in the typical design ...

AI Technical Summary

Problems solved by technology

There has been a composite cable protection tube in the market that utilizes the advantages of thermoplastic materials and thermosetting materials to organically combine FRP and polypropylene. However, it simply uses FRP as the outer tube and polypropylene as the inner tube. The method of direct combination, because thermoplastic is a very typical non-polar crystalline material, has low surface tension, large shrinkage rate, poor creep resistance, poor dimensional stability of the product, and is prone to warping deformation. It is difficult to combine with other The materials are adsorbed together, resulting in a gap between the pipes of the two materials, and even in the process of pulling the cable, the inner pipe will be pulled out, which cannot meet the purpose required by the market

In addition, wires and cables often burn due to self-heating or external fires during the transmission of electrical energy, and the combined composite cable protection tube has a poor flame retardant effect, which greatly limits its use.

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