Double wall bellows

Abstract

The invention provides a double-wall corrugated pipe. The double-wall corrugated pipe comprises an outer wall and an inner wall, wherein the outer wall is barrel-shaped; first annular convex parts and first annular concave parts are alternately formed in the length direction of the outer wall; the inner wall is straight-barrel-shaped, sleeves in the outer wall, is connected with the first concave parts, and forms first cavities with the first convex parts; the outer wall is made from HDPE; and the inner wall is made from LDPE. According to the double-wall corrugated pipe provided by the invention, the outer wall is of a corrugated structure and takes HDPE as a raw material, so that the annular rigidity of the outer wall is ensured; and the inner layer takes LDPE as a raw material, so that the bending rigidity is lowered.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to a double-wall corrugated pipe, which is applied to same-floor drainage and prefabricated building drainage. Background technique [0002] Double-wall corrugated pipes are mainly used for: urban drainage, sewage engineering, drainage engineering, farmland irrigation, sand control engineering, low-pressure water supply system, municipal drainage, renovation of sewage pipes, buried sheathing of wires and cables, etc. The existing double-wall corrugated pipe has a smooth inner wall and a corrugated outer wall, and the trough section of the outer wall and the inner wall are bonded together through high-temperature extrusion. The outer wall has a ring-shaped corrugated structure, which greatly enhances the ring stiffness of the pipe, thereby enhancing the pipe's resistance to soil loads. To achieve the same ring stiffness, the corrugated pipe can save 50% to 70% of the material compared...

AI Technical Summary

Problems solved by technology

[0004] The existing double-wall corrugated pipes have strong structural rigidity, poor toughness, and cannot be bent. They are all a few meters or more than ten meters long. The cost of transportation and connection is high, and the construction is difficult. In addition, for building drainage pipes, there are many pipes and need to be cut. The processes of positioning, calculation and connection are relatively cumbersome; there are also phenomena that some sanitary appliances cannot be accurately positioned

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