Anchor clips for steel strand fatigue test

Abstract

An anchor clip for a steel strand fatigue test of the present invention comprises several clips that are surrounded together and can be squeezed toward the axis. A cylindrical clamping groove is formed, and a ring of tightening spring fixing grooves is provided at the rear of the conical surface. The inner surface of the clip at the rear of the clamping groove is provided with ring teeth, and the inner surface of the clip at the middle and front of the clamping groove is A number of side-by-side and spaced annular pressure relief grooves are provided, and a guide section is provided at the front of the wire clamping groove. The beneficial effects of the present invention are: the clamping of the steel strand is firm and reliable, and the annular pressure relief groove is adopted to make the clamping force of the clip on the steel strand evenly distributed without damage, avoiding the source of fatigue, and preventing the steel strand from being damaged. Fatigue fracture occurs in the clamping, which can correctly evaluate the fatigue performance of the steel strand, protect the clip itself, and improve the service life.

Description

technical field [0001] The invention relates to an anchor clip for steel strand fatigue test. Background technique [0002] At present, most domestic steel strand fatigue performance tests use clips with ring teeth and point teeth, or directly use engineering anchor clips to clamp the steel strands. During the fatigue test, the ring teeth of the clips hold the Steel strands, but due to the uneven stress on the steel strands, indentations appear on the clamped parts and become a source of fatigue, and then the steel strands break in the chuck during the fatigue test, forming a "notch effect", and this Once this situation occurs, according to the GB / T5224-2003 "Steel Strand for Prestressed Concrete" standard, the test is invalid, so the fatigue performance of the steel strand cannot be correctly evaluated. Contents of the invention [0003] In order to solve the above technical deficiencies, the present invention provides an anchor clamp for steel strand fatigue test which ...

AI Technical Summary

Problems solved by technology

[0002] At present, most domestic steel strand fatigue performance tests use clips with ring teeth and point teeth, or directly use engineering anchor clips to clamp the steel strands. During the fatigue test, the ring teeth of the clips hold the Steel strands, but due to the uneven stress on the steel strands, indentations appear on the clamped parts and become a source of fatigue, and then the steel strands break in the chuck during the fatigue test, forming a "notch effect", and this Once this situation occurs, according to the standard of GB / T5224-2003 "Steel Strand for Prestressed Concrete", the test is invalid, so the fatigue performance of the steel strand cannot be correctly evaluated.

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