Full-plastic joint connecting device for steel wire skeleton plastic composite pipes and construction method

Abstract

The invention relates to the field of water supply and water drainage of buried polyethylene steel wire skeleton composite pipes, and particularly relates to a full-plastic joint connecting device forsteel wire skeleton plastic composite pipes and a construction method. The full-plastic joint connecting device comprises the two steel wire skeleton plastic composite pipes opposite to each other; acorresponding inner layer connecting piece is arranged in the middle of each of the two steel wire skeleton plastic composite pipes; outer side walls of the two sides of the corresponding inner layerconnecting piece are connected with inner walls of the steel wire skeleton plastic composite pipes arranged on the corresponding parts of the corresponding inner layer connecting piece in a hot melting manner; a corresponding outer layer connecting piece is arranged on the outer side of the corresponding inner layer connecting piece in a sleeving manner; and inner walls of the two sides of the corresponding outer layer connecting piece are respectively connected with outer side walls of the corresponding steel wire skeleton plastic composite pipe arranged on one side in a hot melting manner.The full-plastic joint connecting device disclosed by the invention has the advantages that structural design is reasonable, an operation is simple, structural strength of a connection part can be effectively ensured, and the structure is stable and is good in high pressure resistance, and is good in sealing performance.

Description

technical field [0001] The invention relates to the field of water supply and drainage of buried polyethylene steel wire frame composite pipes, in particular to a steel wire frame plastic composite pipe all-plastic connection joint device and a construction method in a sub-high pressure all-plastic anticorrosion-free connection mode. Background technique [0002] Steel mesh skeleton polyethylene composite pipe is reinforced by a network skeleton formed by high-strength steel wire spirally wound left and right, with high-density polyethylene as a matrix, and a high-performance high-density polyethylene modified bonding resin is used to connect the steel wire skeleton to the inner pipe. , A new type of pipe in which the outer layer of high-density polyethylene is tightly connected. In the fields of traditional municipal infrastructure construction, mining and other water supply and drainage, steel mesh skeleton polyethylene reinforced composite pipes have been widely accepted ...

AI Technical Summary

Problems solved by technology

A single steel mesh skeleton polyethylene composite pipe has excellent structure and physical properties. When two steel mesh skeleton polyethylene composite pipes are connected, the structural strength of the joint determines the strength of the entire steel mesh skeleton polyethylene composite pipe. The strength of the pipeline; the traditional connection methods mainly include the following: one is to connect two adjacent steel mesh skeleton polyethylene composite pipes by means of mechanical connections such as threads. The advantage of this connection method is that the connection is relatively Fast and convenient, for example: the patent document with patent announcement number CN201561227U discloses mechanically connected plastic pipe fittings, which mainly uses a threaded plastic connector to connect two plastic pipes by screwing them together. The connection method usually needs to withdraw the internal or external thread on the connected pipe, which will greatly affect the overall structural strength of the standard part, especially when the connection part is used under high pressure for a period of time It is easy to cause leakage and damage to the connection parts

In the field of buried pipe water supply and drainage, the sub-high pressure that the water supply pipe needs to withstand generally reaches the nominal pressure of 2.0MPa-3.5MPa. Therefore, this connection method needs to withstand the above-mentioned sub-high pressure working environment inside the pipe such as buried water supply and drainage. In addition, the traditional plastic connection method is only suitable for pipe connections with pressure levels of 1.6MPa and below, so it cannot effectively meet the sub-high pressure working environment mentioned in this application; the second connection method mainly uses metal connectors To screw the two plastic pipes together, although this type of connection can meet the high pressure resistance requirements, the use of metal connectors in buried and humid working environments is likely to cause corrosion of the metal connectors, common anti-corrosion It is difficult to carry out long-term and effective anti-corrosion of metal connectors by technology. Once the metal connectors are corroded and damaged, the pressure resistance of the connection parts will drop sharply very quickly. Therefore, the traditional method of using metal connectors cannot be well satisfied. The working environment described in this application; the third connection method mainly uses heat fusion between plastic pipes to achieve the purpose of mutual connection, for example: disclosed in the patent document CN203517133U A double hot-melt steel-plastic composite pipe welding structure, which is mainly through the two plastic pipe fittings and the ends of the two steel-plastic composite pipes to be plugged and hot-melted, and then the two plastic pipe fittings are socketed and heated by the plastic head of the pipe fittings. Melting, this connection method has a disadvantage: when the pressure in the pipeline is high and the water flow is unstable, it is easy to cause the high-pressure water flow to act on the gap or contact surface between the plastic head of the pipe fitting and the plastic pipe fitting. When the pipe is connected, the plastic pipe fittings are directly in contact with the internal water flow, and each plastic pipe fitting and the pipe socket plastic head are directly welded only through the outer wall. When the single-layer connection structure is opposite to the high-pressure impact, it is very easy for the plastic pipe fittings to push out and cause Therefore, the connection structure in the above-mentioned patent documents still cannot well guarantee the long-term use of the pipe fittings in the high-pressure environment described in this application, and the compression resistance effect is poor. Obviously, the existing connection methods of plastic pipe fittings It cannot be more effectively used in the sub-high pressure environment of buried water supply and drainage

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