System and method for detecting effective prestressing force under anchor by adopting method for detecting and stabilizing clamping piece displacement

Abstract

The invention discloses a system and method for detecting effective prestressing force under anchor by adopting a method for detecting and stabilizing clamping piece displacement, the detection system and the detection method are included, and the detection system comprises a computer control center, a measurement control terminal, an oil pump, a jack, a force sensor, a displacement measurement tool, an anchor head and a steel strand; the detection method comprises the following implementation steps: S1, mounting a basic detection system; S2, detecting prepressing of the system; S3, detecting system safety parameter setting; S4, detecting system test parameter setting; S5, detecting system program control and data processing work; and S6, detecting the close of the system. The system and the method have beneficial effects of practical and convenient in use, simple operation, less detection problem, unnecessary of reading knee point, no influence on original prestressing force, high detection reliability, high detection safety and high detection precision.

Description

technical field [0001] The invention relates to the technical field of post-tensioning prestress detection technology, in particular to a system and method for detecting effective prestress under an anchor by detecting and stabilizing clip displacement. Background technique [0002] The size of the post-tensioning prestress is an important indicator to directly measure the performance of the prestressed structure. At present, the most commonly used and relatively reliable detection method is the reverse tension method. [0003] There are also many kinds of tests for the reverse pull method, which can be roughly divided into two test forms: whole bundle and single root. The whole beam tension is to measure the sum of the effective prestress of the whole anchor head by simultaneously tensioning each steel strand of the anchor head, and the single tension is to stretch each steel strand separately, and the measured single The sum of the prestress values ​​is the effective pres...

AI Technical Summary

Problems solved by technology

[0006] The biggest test of the current anti-tension method is mainly the inflection point method and the limit method. The inflection point method mainly judges the effective prestress value under the anchor through the inflection point of the overall displacement relationship curve between the force and the steel beam. The main problem of the inflection point method is: The incongruity of each steel strand caused by beam tension makes some clips have larger friction resistance, and the effective clip has smaller friction resistance. Disturbance of the clip makes it impossible for the clip to return to its original position when it is stretched, which will have a greater impact on the structural bearing capacity. For clips with small friction resistance, sometimes it is difficult to have an inflection point of reverse pull, which brings difficulties to the interpretation of the results. Many troubles; the main problem of the limit method is: generally when the limit point is reached, the value is read, and the clip will appear due to the increase in the length of the free section of the steel strand participating in the stretch after overcoming the friction of the clip during the stretching process. Retraction, just reading the value of the limit point will cause the test result to be too large. In summary, there are many problems in the existing method, and it is difficult to guarantee the detection accuracy

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