Pore-forming device and pore-forming method of prestressed pipe

Abstract

The invention discloses a pore-forming device and a pore-forming method of a prestressed pipe. A first fixed rod and a second fixed rod are connected with the two sides of a U-shaped fixed rack separately and are positioned on the same side of the U-shaped fixed rack; the U-shaped fixed rack, the first fixed rod and the second fixed rod jointly form a limiting opening; the limiting opening is usedfor allowing the prestressed pipe to penetrate through; the U-shaped fixed rack, the first fixed rod and the second fixed rod are in contact with the outer wall of the prestressed pipe; one side of the top of the U-shaped fixed rack is connected with the side wall of a pipeline; one end of the pipeline is propped against the outer wall of the prestressed pipe; and a breakdown rod can penetrate through the pipeline and is used for breaking down the prestressed pipe. The pore-forming device can avoid the risk that concrete slurry enters the prestressed pipe to block a pore channel due to pore forming and also can avoid the risk that when a steel strand is pulled, the steel strand is stressed to extrude the prestressed pipe to seal an exhaust vent.

Description

technical field [0001] The invention belongs to the technical field of bridge prestressing, and in particular relates to a pore-making device and a pore-making method for a prestressed pipeline. Background technique [0002] The prestressed pipe is also called bellows, and its grouting compactness has an important impact on the durability of the bridge. If there is no vent hole at the highest point of the prestressed pipe, the grouting effect will be uneven during high pressure grouting, and the grouting will not be smooth. If the grouting is not dense, it will also lead to the corrosion of the steel strands in the prestressed pipeline, which will lead to the loss of prestressed force in advance, and shorten the actual life of the bridge. [0003] The vent hole is set at the highest point, which can exhaust the grout during grouting, ensure the quality, ensure that the air can be discharged, and ensure the compactness of the grout. However, the traditional direct buried pip...

AI Technical Summary

Problems solved by technology

However, the traditional direct buried pipe has the risk of concrete slurry entering the corrugated pipe due to hole making and blocking the hole, and there is a risk that the steel strand will be forced to squeeze the reserved pipe to close the vent hole during tension.

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