Carding locator and construction method for prestressed tendon passing through pre-embedded pipe

Abstract

The invention discloses a carding positioner for allowing prestressed tendons to penetrate in an embedded pipe and a construction method. The positioner comprises a shuttle-shaped pipe body (1), and the shuttle-shaped pipe body (1) is provided with a transverse partition, and tendon penetrating holes and slurry passing holes penetrate through the transverse partition. The key of the method lies in that the front ends of the prestressed tendons (7) are sleeved with all carding positioners at a time, the prestressed tendons (7) are pulled, and the carding positioners are connected with the prestressed tendons (7) through iron wires; then a gate (9) is opened, the carding positioners at the front ends enter the embedded pipe (8) in a following mode, and the gate (9) is returned soon afterwards; and the follow-up carding positioners are clamped again, the carding positioners entering the embedded pipe (8) are firmly fixed to the prestressed tendons (7), opening and closing of the gate and pulling are conducted repeatedly, and all the carding positioners enter the embedded pipe (8). The positioner and the construction method can guarantee that all the prestressed tendons (7) are evenly distributed in the embedded pipe (8) in parallel in a non-winding and non-overlapping mode in the penetrating process.

Description

technical field [0001] The invention relates to the technical field of prestressed concrete construction, in particular to a carding locator for prestressed tendons passing through pre-embedded pipes and a construction method thereof, and more specifically, a prestressed tendon bonded in group anchors When threading bundles in pre-embedded pipes, a device for combing and positioning each prestressed tendon and a construction method for prestressed tendons threaded in pre-embedded pipes. Background technique [0002] In prestressed concrete construction, pre-embedded pipes should be laid before concrete pouring. The pre-embedded pipes are generally corrugated pipes, and then the concrete is poured to form channels for prestressed tendons to pass through. Penetrate through the tunnel, that is, the opening at the back end of the pre-embedded pipe, and then pass through the opening at the front end, that is, thread through the beam. After the beam is threaded, each prestressed t...

AI Technical Summary

Problems solved by technology

[0004] In the process of the above-mentioned prestressed tendons passing through the tunnel, due to factors such as the large number of prestressed tendons, the long length, and the many bends in the tunnel, it is easy for the prestressed tendons to intertwine and overlap each other in the process of passing through the tunnel.

Once the winding and disturbing situation occurs, the prestressed tendons are prone to uneven stress during tension, resulting in different elongation of each prestressed tendon, which in turn affects the accuracy of the tension control stress and the measured elongation value, especially The deviation between the measured elongation and the theoretically calculated value exceeds plus or minus 6% of the limit specified in the code, which is not allowed by the code and will affect the quality of the anchoring construction

Moreover, at the same time, at each elbow of the pre-embedded pipe, it is often easy to cause the deviation of each prestressed tendon to one side, which will directly affect the subsequent grouting process, resulting in the deviation of the cement slurry poured into the pre-embedded pipe. Inhomogeneity, or even no grout on the surface of the local tendons, will affect the quality of the final anchorage

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