Internal rib-reinforced outer corrugated plastic wound structural wall pipe and manufacturing method thereof

Abstract

The invention discloses an internal rib-reinforced outer corrugated plastic wound structural wall pipe and a manufacturing method thereof. The pipe comprises a pipe body formed by winding and welding special-shaped strips spirally, wherein the pipe body comprises a cylindrical pipe wall, a hollow reinforcing rib wound on the pipe wall spirally and a reinforced internal rib which is positioned in the hollow reinforcing rib and is perpendicular to the pipe wall; the reinforced internal rib divides the hollow reinforcing rib into two hollow cavities which are parallel; and the welded combinationsurface is positioned at the position of the reinforced internal rib. The pipe is formed by winding the plastic special-shaped strips of which two sides are provided with tubular bulges with the hollow cavities spirally and fusing by molten gel. In the manufacturing method, the pipe is formed by winding the plastic special-shaped strips of which the two sides are provided with the tubular bulges with the hollow cavities spirally and fusing by the molten gel, so an obtained plastic corrugated pipe is provided with the hollow reinforcing rib wound on the outer side of the pipe wall, and has high ring stiffness, the combined action of pipe clay and high strength. In addition, by a structure of the reinforced internal rib, the stability of the hollow reinforcing rib can be improved effectively, so that the stability of the wound corrugated pipe is superior to that of other wound corrugated pipes and dual-wall corrugated pipes.

Description

technical field [0001] The invention relates to an inner rib-reinforced outer corrugated plastic winding structure wall pipe, and also relates to a manufacturing method of the pipe. Background technique [0002] The outer corrugated plastic winding structural wall pipe with hollow reinforcing ribs is widely used in the construction of municipal sewage pipelines because of its good pipe-soil interaction and ring stiffness. [0003] At present, there are usually two manufacturing methods for the outer corrugated plastic winding structural wall pipes with hollow ribs. [0004] refer to figure 1 , the first manufacturing process of the above pipe. First extrude the molten strip-shaped plastic sheet 1 from the first extruder, and then make the sheet continuously and regularly side by side and spirally wound on a circular forming drum equipped with a plurality of actively rotating small rollers. At the same time, the trapezoidal tubular reinforcing rib 2 is extruded by another ...

AI Technical Summary

Problems solved by technology

However, this process has the following defects: (1) Since the reinforcing rib 2 is wound after being cooled and shaped, its height cannot be too large, so the moment of inertia of the tube wall after forming is small; (2) The reinforcing rib 2 and the tube wall It is difficult to control the bonding of the strip-shaped plastic sheet 1. If the temperature of the strip-shaped plastic sheet 1 is too low, the bonding will be poor; if the temperature is too high, the strip-shaped plastic sheet 1 will fall from the forming roller and it will be difficult to control the molding; (3) After finishing After bonding, there is always a gap 3 on the side of the rib 2, resulting in stress concentration. When the ambient temperature changes alternately, the welded surface will gradually crack from the gap 3, which will easily cause the pipe wall and the rib 2 to separate and collapse.

This process has the following disadvantages: the welding position is at the weakest part of the pipe, and the welding surface is small and the amount of melt glue is small, thereby reducing the overall bending strength of the pipe

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