Steel strand releasing auxiliary tool and prestressed steel strand releasing method

Abstract

The invention discloses a steel strand releasing auxiliary tool and a prestress steel strand releasing method. The steel strand releasing auxiliary tool comprises: a steel strand connecting component, wherein a first clamping piece taper hole and a second clamping piece taper hole are oppositely formed in the two ends of the steel strand connecting component, and conical clamping pieces are arranged in the first clamping piece taper hole and the second clamping piece taper hole; and a jack jacking table which comprises an upper platform plate and a base, wherein a steel strand hole is formed in the upper platform plate, a bottom hole is formed in the bottom of the base, and the steel strand connecting component can penetrate through the bottom hole and move towards the steel strand hole in the jack jacking table. The auxiliary tool is simple in structure, convenient to mount, low in material consumption and low in use cost; the auxiliary tool can be recycled, and clamping pieces can be removed after releasing, so that repeated utilization can be realized; and the auxiliary tool is novel in structure, and solves the problems of lengthening and releasing of steel strands.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to an auxiliary tool for tensioning steel strands and a tensioning method for prestressed steel strands. Background technique [0002] When using the post-tensioning method, the prestressed steel strands are generally arranged through the beam and slab. After the tension is completed, the steel strand clips at both ends of the beam and slab are self-anchored to ensure that the steel strands always maintain a certain stress, making it tense. After the prestressed steel strand is installed, when tensioning, it is necessary to reserve a certain length of steel strand to ensure that the jack can directly clamp the steel strand for tensioning. After the tensioning is completed, the steel strand is cut and anchored. The grouting operation shall be carried out after the airtightness is ensured. Sectional concrete is generally used for anchor sealing, and the concrete shall cove...

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Problems solved by technology

[0004] After the tensioning is completed, if the concrete of the beam body is not dense, the beam body is easily sunken and damaged under the great force of the steel strand, causing the steel strand to retract, resulting in the loss of prestress, and the tension effect required by the design cannot be achieved. , at this time, it is necessary to take out the steel strand and reinstall the steel strand after repairing the beam.

[0005] In this case, because the remaining length of the remaining steel strand after cutting is very short, it cannot meet the working length requirements of the jack, and the steel strand cannot be taken out and reinstalled for tensioning. Reduce the standard to use or scrap, because the cost of the beam and slab is expensive, it will cause huge economic losses

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