Protective device for prestressed duct hole-forming

Abstract

The invention relates to a protective device for prestressed duct hole-forming. According to the corrugated pipe protection measures, steel stranded wires parallel to bundled steel wires and a plasticpipe above the steel stranded wires are in formed holes of a corrugated pipe and occupied a certain space, an effective channel is formed in formed holes of the steel stranded wires and the prestressed duct after concrete pouring is completed and the a plastic pipe is pulled out, the channel can be deformed and moved with tensioning of the steel stranded wires when prestress tensioning, while theformed channel area can further ensure smooth passing of cement paste during mud jacking in the later to the smallest extent. According to the scheme, the weakness of protecting a linear plate is solved exactly, the protective device is adapted to various ducts and various working conditions, is low in cost, and can be reused. The defects that during prestressed duct hole-forming, holes exist inthe hole wall of the corrugated pipe, local release slurry leakage happens, the steel stranded wires cannot threaded in after denting cause by impacting, and mud jacking cannot be achieved after the steel stranded wires are threaded firstly and tensioning is conducted are overcome; and the defects that the cost of linear pipe protecting is high and the adaptation range is small are further overcome, so that the effect that the duct is protected to be smooth can be achieved.

Description

technical field [0001] The invention relates to a post-tensioned prestressed channel in a civil building structure. It is a protective device and a preventive measure for preventing local grout leakage and crushing of the channel during concrete pouring, resulting in difficulty in threading steel strands or grouting in the later stage. The utility model relates to a protective device for forming a hole in a prestressed tunnel. Background technique [0002] The post-tensioned prestressed channels used in the existing civil building structures are getting longer and longer, the continuous structural channels have more and more flat and vertical bending positions, and the thickness of the concrete is increasing; and as long as there is a small hole or If a tamping worker accidentally hits a pipe with a tamping rod, it will cause the hole to be blocked, so that the steel strands cannot penetrate. The traditional method is to find out the blockage and "open the belly" of the stru...

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the defects such as holes in the bellows wall when the prestressed channel is formed, partial tripping and leakage of slurry, failure to penetrate the steel strand after being dented by the impact, and inability to press the slurry after first passing through the steel strand and stretching; Due to the high cost of the protective liner and the small adaptability, a protection device for the prestressed channel to form a hole is proposed.

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