Relative displacement automatic measurement device of anchor clamping piece and steel strand

Abstract

The present invention relates to a relative displacement automatic measurement device of anchor clamping pieces and steel strands. The device comprises a support, a plurality of connection rods arranged on the support, an anchor lower support pad plate and a plurality of magnetic force blocking blocks and a plurality of fastening blocking blocks which are arranged on the steel strands in a staggering mode. The support is absorbed on the anchor lower support pad plate; the connection rod is provided with a plurality of displacement sensors connected with a data collector through a cable; the displacement sensors are butted against the magnetic force blocking blocks and the fastening blocking blocks; the magnetic force blocking blocks in one-to-one correspondence with the end faces of the anchor clamping pieces from low to high in different heights; and the numbers of the magnetic force blocking blocks and the fastening blocking blocks are the same. The relative displacement automatic measurement device is high in test precision and high and safe in automatic degree.

Description

technical field [0001] The invention relates to the technical field of testing prestressed engineering materials, in particular to an automatic measuring device for the relative displacement of anchor clips and steel strands. Background technique [0002] In the static load anchoring performance test of the anchorage, according to the requirements of the national standard, it is necessary to measure the relative displacement of the anchor clip and the steel strand. At present, there is a crude method for measuring the relative displacement between the anchor clip and the steel strand, that is, load step by step according to 20%, 40%, 60%, and 80% of the standard value of the tensile strength of the steel strand, and use a vernier caliper to directly Measure the displacement of the anchor clip relative to the anchor, and directly measure the displacement of the steel strand relative to the anchor with a ruler or tape measure. However, this method has the following defects: (...

AI Technical Summary

Problems solved by technology

However, this method has the following defects: (1) Due to the dense arrangement of the anchor holes and the small distance between the anchor holes, it is not convenient to measure; (2) According to the requirements of the national standard, this method cannot simultaneously Measure the relative displacement of several anchor clips and steel strands at the tension end and the relative displacement of the anchor clips and steel strands at the anchorage end; (3) the measured data is relatively rough, and there are differences in artificial readings; When shrinking in the anchor hole, it is impossible to conveniently measure the relative displacement of the anchor clip; (5) there is a potential safety hazard, because the steel strand may break at any time during the test process, once broken, the steel strand and the clip fly out will hurt

In the test, it is necessary to measure several data in four stages, which brings considerable danger to the test personnel.

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