19-wire steel strand anchoring structure

Abstract

The invention relates to a 19-wire steel strand anchoring structure, and solves the problem that the existing anchorage device clamping pieces are applicable to steel strands with a 1*7 wire structure, but not applicable to steel strands with a 1*19 wire structure in three-layer arrangement. The 19-wire steel strand anchoring structure is characterized in that the tooth-form section of threads of the anchorage clamping piece is triangular; the crest angle of the threads is 75-85 degrees; one of the two side surfaces of the crest angle facing the minor diameter end of the anchorage clamping piece is a wedge surface, and the other side surface facing the major diameter end of the anchorage clamping piece is a chamfered surface; and the included angle between the connecting lines of the chamfered surface and the two roots of the threads is 65-85 degrees. Through the new design of the crest angle, the chamfered surface and the wedge surface of the threads, the included angle of the chamfered surface results in that a chamfer is formed on the threads, thus preventing the anchorage clamping piece from slipping off, and facilitating follow-up when a tendon in stretched and retracted. Through designing the included angle of the wedge surface, the intensity of pressure on the steel strand is small, which facilitates the loosening of the anchorage clamping piece, the retreat of the steel strand and the control on the crest angle, thus ensuring that nick of the threads with respect to the surface of the steel strand is relatively appropriate, and the steel strand is not caused to break prematurely.

Description

technical field [0001] The invention relates to an anchoring structure, in particular to a 19-wire steel strand anchoring structure suitable for 19-wire steel strands. Background technique [0002] Since the mid-1980s, my country began to introduce internationally advanced low-relaxation, high-strength prestressed steel strand production lines. At present, steel strands have become the most widely used prestressed materials in the world. The dimensions and specifications widely used are ?12.7mm, ?15.2mm, etc., and the commonly used strength level is 1860MPa level. At present, the 1860MPa grade 1X7-?15.24mm high-strength and low-relaxation prestressed steel strand is the type with the highest strength level, the most widely used and the largest demand among the prestressed steel strands widely used in commercial applications, but in the above fields, the 1X7 structure The prestressed steel strand increasingly shows its limitations: (1) The load capacity of a single steel str...

AI Technical Summary

Problems solved by technology

[0007] The invention solves the problem that the existing anchor clips are suitable for 1X7 wire structural steel strands, but not suitable for three-layered 1X19 wire structural steel strands, and provides a 19 wire steel strand anchoring structure, which is compatible with 1X19 wire Structural steel strands are matched so that 19-wire steel strands can be used in engineering

Images