Bidirectional bell and spigot clad pipe based on enhanced steel skeleton and process for producing clad pipe

Abstract

Disclosed are a bidirectional bell and spigot clad pipe based on an enhanced steel skeleton and a process for producing the clad pipe. The producing process includes the technical scheme of producing a main skeleton and a secondary skeleton by the process of casting and stamping, producing a bell-and-spigot main pipe and a bell-and-spigot secondary pipe by the process of injection molding and powder coating, then performing bidirectional adaptive connection and assembling to form a set of bell-and-spigot clad pipe, and performing protection treatment, wherein a covering layer is arranged outside the main skeleton of the bell-and-spigot main pipe, a separation convex ring is arranged in the inner cavity of the main skeleton of the bell-and-spigot main pipe, bell-and-spigot cavities which are in an adaptive connection with the bell-and-spigot secondary pipe are arranged on two sides of the separation convex ring respectively, a set of grooves are arranged in each of the bell-and-spigot cavities, and adaptive sealing rings are arranged in the grooves. According to the bidirectional bell and spigot clad pipe based on the enhanced steel skeleton and the producing process thereof, the defects are overcome that the existing cast-iron pipes, cast-steel pipes, poly ethylene pipes and plastic pipes and the like can not be interchanged, when the pipes are connected and installed, electricity has to be provided, rapid stress cracking is easy to happen in welding, and when the connection of breakage portions exceeds the length of half pipe, water leakage, gas leakage, fluid leakage and environment pollution are caused. The bidirectional bell and spigot clad pipe is applicable to various connection pipes in water transportation and gas transportation engineering and particularly applicable to interchange connection bell and spigot of ductile iron pipes and plastic pipes such as poly ethylene pipes, rigid polyvinyl chloride pipes and modified polyvinyl chloride pipes.

Description

technical field [0001] The invention relates to a composite pipe based on a steel frame reinforced bidirectional socket 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 ...

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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 The sockets of metal pipes and polyethylene (PE) resin plastic composite pipes cannot be interchanged, such as national standard ductile iron pipes, cast steel pipes, PE pipes, PVC pipes, and PPR pipes; When connecting polyethylene electrofusion pipes, the inner plastic of the pipe is melted and connected with the inner plastic of the pipe by using the internal heating element of the pipe. Therefore, electricity must be turned on during installation, and the use in remote and high mountain areas will be affected to a certain extent; Sixth, welding The equipment is heavy and must be transported by car, which is expensive and laborious, and the installation cost is too high

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