Ultrasonic phased array system and concrete filled steel tube construction method

Abstract

The invention discloses an ultrasonic phased array system and a steel tube concrete construction method, and the system comprises an ultrasonic probe array which comprises a plurality of array elements distributed in an array shape; the array element is a dry coupling probe and is used for exciting longitudinal waves as a detection carrier; the magnetic suction device is mounted on the ultrasonic probe array and is used for being adsorbed on the surface of a steel plate of the steel pipe, so that the dry coupling probes are uniformly coupled with the steel plate; the pulse transmitter is used for driving each array element; the signal amplifier is used for amplifying the ultrasonic signals received by the dry coupling probes; and the signal receiving module is used for receiving the ultrasonic signal amplified by the signal amplifier and transmitting the received ultrasonic signal to the data processing module through the wireless transmission module. The system is adsorbed on the surface of a steel plate by adopting the magnet during detection, so that uniform coupling between the probe and a detected medium is realized, a coupling agent does not need to be smeared, the detection speed is high, and the system can find defects in time in the pouring process of the concrete filled steel tube.

Description

technical field [0001] The invention relates to the field of building construction, in particular to an ultrasonic phased array system and a steel tube concrete construction method. Background technique [0002] The CFST structure improves the strength and stiffness of the steel pipe by filling the steel pipe with concrete, which has the advantages of high bearing capacity, high ductility, superior seismic performance, short construction period and light structure weight, but is limited by the large cross-sectional size, complex internal structure and difficult construction. Due to the influence of other factors, the CFST components poured with the existing construction technology often have quality defects such as holes, looseness, and voids, which seriously affect the safety performance of the engineering structure. [0003] The testing methods for the pouring quality of concrete filled steel tubes mainly include countermeasure ultrasonic method and ultrasonic phased array...

AI Technical Summary

Problems solved by technology

The countermeasure ultrasonic method uses two ultrasonic probes to test and analyze the propagation velocity, amplitude and phase of the ultrasonic longitudinal wave in the concrete filled steel tube after pouring, so as to judge the pouring quality of the concrete filled steel tube, but the method uses a single point detection, and the detection efficiency is low

Ultrasonic phased array adopts array element sensors distributed in an array. By controlling the delay time of excitation or receiving pulses of each element, ultrasonic beam deflection and focusing imaging can be realized to detect whether there are defects and their positions inside the steel tube concrete after pouring. However, most of the currently used phased array instruments use 50kHz shear waves as the detection carrier, and perform non-destructive testing after the concrete hardens. The identified defects need to be repaired by damage methods, which has poor timeliness and high repair costs, and it is impossible to realize the defects. Quantitative identification

At the same time, current phased array instruments mostly use piezoelectric probes or dry-coupling probes. Piezoelectric probes need to add coupling agent on the surface of the object to be tested, and dry-coupling probes need to manually apply pressure. During the detection process, uneven coupling is prone to occur, and the detection low efficiency

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