A steel strand threading device

Abstract

The invention discloses a steel strand threading device, which comprises a threading machine. An arranging machine is arranged on the upper stream of the threading machine; a cutting machine is arranged on the lower stream of the threading machine; the arranging machine comprises an arranging plate and a moving support seat for driving the arranging plate to move along length directions of steel strands; and a plurality of arranging holes for the steel strands to penetrate through are formed in the arranging plate. The steel strand threading device provided by the invention realizes the integration of arranging, threading and cutting of the steel strands, and has the advantages of simple structure, high automation degree, high efficiency, cost saving, capability of preventing the steel strands from winding, capability of keeping the end parts of the steel strands parallel and level after threading, and the like.

Description

technical field [0001] The invention relates to prestressed box girder construction equipment, in particular to a steel strand threading device. Background technique [0002] Since the length of the prestressed box girder steel strand is generally 32m-36m, and the prestressed hole has a certain degree of bending, during the construction of the prestressed box girder, the steel strand is easily wound, so that the steel strand and the anchor plate hole are not connected. Correspondingly, the positions of steel strands, jacks and tunnels are not vertical, and there is a stress difference between each steel strand, which increases the frictional resistance with the anchor plate at the anchor port, increases the prestress loss, and affects the service life of the box girder structure; in addition, The net length of the twisted strand will also change, so the stress of each strand in the strand bundle after tensioning will be different, and the actual elongation measurement result...

AI Technical Summary

Problems solved by technology

[0002] Since the cutting length of the prestressed box girder steel strands generally reaches 32m-36m, and the prestressed tunnel has a certain degree of bending, during the construction of the prestressed box girder, the steel strands are easily wound so that the steel strands and the holes of the anchor plate are not aligned. Correspondingly, the positions of the steel strands, jacks, and tunnels are not vertical, and there is a stress difference between the steel strands, which increases the frictional resistance with the anchor plate anchorage, increases the loss of prestress, and affects the service life of the box girder structure; in addition, The net length of the entangled steel strand will also change, and the stress of each steel strand in the steel strand bundle will be different after tension, and the actual elongation measurement result will also exceed the allowable deviation

At present, hoists are usually used to pull the steel strands from one end of the box girder to the other in beam making yards, which has low efficiency, complicated operation, slow construction progress, high labor costs, and poor quality and safety guarantees.

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