Half steel frame reinforcing type socket-and-spigot composite pipe and manufacture process thereof

Abstract

Provided are a half steel frame reinforcing type adapting type composite pipe and a manufacture process thereof. The manufacture process includes manufacturing a frame by adopting casting or stamping process, and respectively manufacturing a socket-and-spigot main pipe and a socket-and-spigot auxiliary pipe in injection molding and spraying mode and assembling the pipes. A frame outer layer is characterized in that an outer wall of the socket-and-spigot main pipe is formed by a large conical wall on the front portion, a cylindrical wall on the back portion and a middle small conical wall, the inner wall of the socket-and-spigot main pipe is composed of a socket-and-spigot cavity and an overflow cavity, a socket-and-spigot composite pipe is composed of the adapting main pipe and the adapting auxiliary pipe in adaptive fit mode, a group of grooves are arranged on a front end opening of the frame, and a sealing ring is arranged in the grooves respectively in fit mode. The half steel frame reinforcing type adapting type composite pipe overcomes the shortcoming that a polyethylene resin plastic composite pipe / polyethylene (PE) pipe is easy to separate due to the fact that expansion coefficient is different in connection installation, non-roundness at the abutting connection position is increased, the welding position generates quick stress cracking and causes the fact that the connection system of the cracking portion leaks water, gas and liquid, a cast-iron pipe and the PE pipe cannot be interchanged, old project modification is affected and the like. The composite type and the manufacture process are suitable for connection pipes of various water delivery and gas delivery projects and are especially suitable for interchangeable connection of plastic pipes such as PE, PVC-U and PVC-M and nodular cast iron pipes.

Description

technical field [0001] The invention relates to a semi-steel frame reinforced socket-type composite pipe and a manufacturing process thereof. Background technique [0002] Existing polyethylene resin plastic composite pipes / PE pipes used for water supply, gas supply, and liquid supply, in order to improve performance and prolong service life, people use steel mesh reinforcement or steel belt reinforcement or steel wire two-way winding reinforcement and socket reinforcement, etc. Measures and treatment methods. Although the plastic composite pipe after these measures and treatment has enhanced axial rigidity and geological subsidence resistance, there are still the following problems: First, the connection of the two pipe sockets is made by electrofusion The pipes are connected by electric welding. When welding, due to the high temperature, the thermal expansion coefficients of the two materials, namely steel wire and plastic, are different, resulting in rapid stress cracking...

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Problems solved by technology

[0002] Existing polyethylene resin plastic composite pipes / PE pipes used for water supply, gas supply, and liquid supply, in order to improve performance and prolong service life, people use steel mesh reinforcement or steel belt reinforcement or steel wire two-way winding reinforcement and socket reinforcement, etc. Measures and treatment methods. Although the plastic composite pipe after these measures and treatment has enhanced axial rigidity and geological subsidence resistance, there are still the following problems: First, the connection of the two pipe sockets is made by electrofusion The pipes are connected by electric welding. When welding, due to the high temperature, the thermal expansion coefficients of the two materials, namely steel wire and plastic, are different, resulting in rapid stress cracking and separation of the two, resulting in leakage at the joint of the socket; second, pipes with the same diameter are made of Hot-melt butt joint, due to the influence of construction environment or personnel operation technology, the mutual lateral movement and dislocation of the pipe walls will increase the non-roundness of the pipe butt joint, making it difficult to guarantee the butt joint quality; third, the existing During the maintenance of PE pipes, if the broken part of the pipe is within the length of the harfur joint, it can be connected with the harfur joint. If the broken part exceeds the length of the harfur joint, it cannot be connected with the harfur joint; in addition, it can be repaired with the harfur joint PE pipe, due to the high toughness of PE pipe, it shrinks greatly due to temperature changes, which is prone to water leakage, air leakage, serious loss of resources such as liquid leakage, and secondary pollution to the environment caused by gas leakage; Fourth, the existing projects use Metal pipes, whose sockets cannot be interchanged with other pipes, such as PE pipes, PVC pipes, PPR pipes, cast iron pipes, cast steel pipes, and steel pipes; Fifth, steel wire grid polyethylene composite pipes are polyethylene electric fusion pipes, and the connection When using the internal heating element of the pipe, the outer plastic of the pipe and the inner plastic of the pipe are melted and connected together. Therefore, electricity must be turned on during installation, which will affect the use of remote and high mountain areas to a certain extent. Sixth, the welding equipment is heavy and must be transported by car. Expensive and laborious, the installation cost is too high

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