Spiral steel-plastic compound pipe formed in buckling and pressing mode

Abstract

The invention discloses a spiral steel-plastic compound pipe formed in a buckling and pressing mode. The spiral steel-plastic compound pipe formed in the buckling and pressing mode comprises a round inner pipe, a reinforcement steel belt and an outer pipe, wherein the reinforcement steel belt is arranged between the round inner pipe and the outer pipe and comprises a plurality of structure units with the shape of the section similar to a horizontal S, the adjacent structure units are meshed and bucked in pairs to form a whole reinforcement layer, an adhesive resin layer coats the surface layer of each structure unit, and each structure unit is connected with the round inner pipe and the outer pipe through the corresponding adhesive resin layer. The spiral steel-plastic compound pipe formed in the buckling and pressing mode is stable in structure, good in sealing performance, flexible, and capable of effectively improving the ring stiffness grade, widening the application range and effectively increasing the inner pressure bearing capacity. In addition, the spiral steel-plastic compound pipe formed in the buckling and pressing mode has the advantages of being smooth in inner wall, resistant to abrasion and corrosion, not prone to aging and the like.

Description

technical field [0001] The invention relates to a steel-plastic composite pipe formed by spiral crimping, which belongs to the technical field of ventilation, water supply and drainage pipe design. Background technique [0002] Spiral ducts are mainly used to communicate the air circulation between the two places, and play the role of ventilation. At present, the spiral air ducts mainly include: galvanized spiral air ducts, stainless steel spiral air ducts, which are mainly used in purification system return air ducts, central air-conditioning ventilation ducts, industrial air supply and exhaust ventilation ducts, environmental protection system suction and exhaust ducts, mine pumping Put gas pipes, etc. The existing spiral air duct made of cold-rolled steel coils overcomes the shortcomings of the original inorganic glass steel pipes, such as poor toughness, high brittleness, easy deformation, moisture absorption and brine return, poor water resistance, etc., as well as the...

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Problems solved by technology

[0005] Secondly, for the field of drainage pipes, steel belt reinforced polyethylene spiral corrugated pipes are currently the mainstay. However, when the DN is greater than or equal to 1000mm, the ring stiffness of the pipe is greatly reduced, and it is necessary to ensure that it has a high ring stiffness. The design requirements are met by adding base materials such as polyethylene material and steel strip thickness, and the cost of pipes also increases accordingly. With the increase of steel strip thickness specifications, the steel strip turning forming process also increases the difficulty;

[0006] Furthermore, because steel belt reinforced polyethylene spiral corrugated pipes are used in drainage projects, they mainly bear external pressure. Therefore, for manufacturers, the requirements for the ring stiffness of pipes are relatively strict in pipe design, and The design of the internal pressure of the pipe is often ignored, and it is impossible to make a technical breakthrough in the pressure pipe, so it also limits the application field of the steel belt reinforced polyethylene spiral corrugated pipe

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