Cast-in-place concrete pile static load test unbalance loading monitoring method based on piezoelectric impedance frequency shift

Abstract

The invention discloses a cast-in-place concrete pile static load test unbalance loading monitoring method based on piezoelectric impedance frequency shift. In the pouring process of the cast-in-placeconcrete pile, a plurality of piezoelectric ceramic part sensors distributed in the circumferential direction are pre-buried in the top of the pile, the piezoelectric ceramic part sensors are led outof a pile body through cables to be connected with an impedance analyzer, the impedance analyzer is connected with a computer terminal, and the cast-in-place concrete pile is poured and maintained. Post-maintenance, static load test platform, a signal generator generates an excitation signal through a piezoelectric ceramic part sensor when not loaded, an electrical impedance signal received by the piezoelectric ceramic part sensor serves as a reference signal, load loading is conducted, electrical impedance signals of sensors at different loading stages are monitored and compared with the reference signal, and pile top section unbalance loading is judged according to the change of the electrical impedance signals. The cost is low, the monitoring and testing processes are synchronous, andthe monitoring accuracy can be ensured to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of foundation detection engineering, and relates to a technology for monitoring the safety of cast-in-situ piles during a static load test on concrete pouring piles, in particular to a monitoring method for unbalanced load in static load tests of concrete pouring piles based on piezoelectric impedance frequency shift. Background technique [0002] The static load test of cast-in-situ piles is considered to be the most intuitive and reliable traditional method for testing the bearing capacity of foundation piles. Common test equipment consists of reaction force devices, loading devices, load and displacement measurement devices, and data acquisition devices. Determining the vertical compressive bearing capacity of a single pile by using the actual working conditions close to the vertical compressive piles is currently recognized as the most intuitive and reliable test method for testing the vertical compressi...

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Problems solved by technology

[0005] The purpose of the present invention is to aim at the gap in the field of safety monitoring of the static load test process of concrete pouring piles at present, and propose a method for monitoring the partial load of the static load test of concrete pouring piles based on piezoelectric impedance frequency shift, so as to solve the problems in the static load test of the prior art. Difficult problems in partial load monitoring

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