System and method for testing prestress under anchor at front end of jack

Abstract

The invention discloses a system and method for testing the prestress under an anchor at the front end of a jack. The system comprises an anchor device, a displacement sensor, a force sensor, a tensioning jack, a steel stranded wire, an oil pump, a test host machine, a position limiting device and a clamping sheet. When the system performs test, the displacement sensor reads the displacement quantity of the clamping sheet in real time; the tensioning force value is detected by the force sensor in real time; the on / off state of the tensioning jack is controlled through the test host machine; the test host machine draws a test curve chart on the basis of the real-time detected displacement quantity and the real-time detected tensioning force value; and when the displacement quantity reachesa set value, the test host machine controls the oil pump to stop working, and the tensioning jack stops tensioning. The system and the method can solve the technical problems that during the test by the existing reverse-tensioning method, the clamping sheet is not limited, so that the over tensioning is caused, and steel stranded wire damage and field accidents occur.

Description

technical field [0001] The invention relates to the technical field of civil engineering quality and safety detection, in particular to a system and method in which a displacement sensor and a force sensor are located at the front end of a jack to test effective prestress under an anchor. 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, stres...

AI Technical Summary

Problems solved by technology

[0008] The invention provides a system and method for testing the prestress under the anchor at the front end of the jack to solve the problem that the clips are not restricted during the existing reverse pull method test, which leads to over tension, so that the steel strand is damaged and on-site accidents occur technical issues

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