A multi-point independent displacement detection device for steel strand clips used in the reverse pull method

Abstract

The invention discloses a multi-point independent displacement detecting device for a steel strand clip for a reverse pulling method and belongs to the technical field of quality safety detection of civil engineering. The multi-point independent displacement detecting device for the steel strand clip for the reverse pulling method comprises a limiting cylinder, a tensioning jack and a host controller; a protective head cover is arranged at one end of the limiting cylinder and the other end tis connected with the tensioning jack; the protective head cover is provided with a limiting cavity, andthe limiting cavity and the clip are arranged oppositely; a displacement sensor is arranged on the side wall of the limiting cylinder; the probe of the displacement sensor orderly penetrates throughthe middle cavity of the limiting cylinder and the limiting cavity and contacts with the clip; and the host controller is respectively in communication connection with the displacement sensor and thetensioning jack. The multi-point independent displacement detecting device for a steel strand clip for a reverse pulling method in the invention monitors the displacement of the clip in real time through the displacement sensor; when the force value of the tensioning jack reaches a set value, the clip starts to break away from an anchorage device; the displacement sensor starts to read; and when the displacement pass by value reaches a preset value, the tensioning jack stops working so as to prevent over-tensioning effectively.

Description

technical field [0001] The invention relates to the technical field of civil engineering quality and safety detection, in particular to a multi-point independent displacement detection device for steel strand clips used in the reverse pull method. Background technique [0002] The size of the prestress in the prestressed concrete structure is the main index affecting the normal performance of the structure during the service period. At present, the detection methods commonly used at home and abroad are roughly divided into two categories: indirect detection and direct detection. Indirect detection technologies mainly include: acoustic emission technology, electromagnetic effect detection technology, ultrasonic detection method, dynamic detection method and anchor end prestress test technology, and its test accuracy is relatively low. Direct detection technology mainly includes: direct detection technology of prestressed tendon, stress release method and reverse pull method. ...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a multi-point independent displacement detection device for steel strand clips used in the reverse pull method, so as to solve the problem that the clamps are not restricted during the existing reverse pull method test, resulting in over tension, so that Strand Damage and Field Accidents

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