Extrusion anchorage device fixed end corrugated pipe sealing device

Abstract

The invention discloses an extrusion anchorage device fixed end corrugated pipe sealing device. The extrusion anchorage device fixed end corrugated pipe sealing device comprises a corrugated pipe, a sealing pipe and a slurry outlet pipe, wherein the left end of the sealing pipe is sleeved outside the end of the corrugated pipe; the right end of the sealing pipe is closed and provided with a limiting pipe for the steel strand to penetrate out; the lower end of the grout outlet pipe extends into the sealing pipe and is located between the end of the corrugated pipe and the limiting pipe; a sealing ring is arranged between the left end of the sealing pipe and the corrugated pipe; and the limiting pipe and the steel strand are sealed through sealant. By performing sealing between the end of the corrugated pipe and the steel strand through the sealing pipe, the sealing ring and the sealant, foam glue does not need to be filled, so that operation is easy, and the sealing performance is good, and the problem that the foam glue blocks the grout outlet pipe is solved.

Description

technical field [0001] The invention relates to the technical field of prestressed engineering, in particular to a bellows sealing device at the fixed end of an extruded anchor. Background technique [0002] In modern urban traffic network, due to linear, aesthetic and functional requirements, it is often necessary to build cast-in-place prestressed concrete girder bridges. In the design of cast-in-place prestressed concrete girder bridges, the prestressed steel strands are generally tensioned at one end, and the fixed ends are usually extruded anchors. [0003] During the construction process, in order to prevent the concrete from entering the corrugated pipe at the fixed end of the extruded anchor when pouring concrete, the corrugated pipe at the fixed end of the extruded anchor and the steel strand need to be strictly sealed. Press the cement slurry into the pipe to fill the gap between the bellows and the steel strand with the cement slurry, thereby preventing the corro...

AI Technical Summary

Problems solved by technology

The traditional sealing method is to fill foam glue (polyurethane foam caulking agent) between the bellows at the fixed end of the extruded anchor and the steel strand. This sealing method has the following problems: if the slurry outlet pipe is inserted too short, the foam glue It is easy to enter the slurry outlet pipe and cause blockage, which affects the subsequent pressing of cement slurry; if the slurry outlet pipe is inserted too long, it will easily cause the end of the fixed end bellows to be grouted when the cement slurry is pressed; the density of the foam seal section is not enough. Water intrusion causes corrosion of the prestressed steel strands, reduces the effective area of ​​the prestressed steel strands, reduces the ultimate bearing capacity of the bridge, and affects the safety of the bridge structure

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