Bridge construction stress detection system based on blockchain

Abstract

The invention discloses a bridge construction stress detection system based on a blockchain. The system comprises an ultrasonic testing device, a WIFI module and a background monitoring center. The ultrasonic testing device comprises an ultrasonic sensor, a signal receiving and processing module and an ARM processor. The signal receiving and processing module comprises an impedance matching circuit, an anti-interference amplifying circuit and a frequency-selecting output circuit; after an output signal of the ultrasonic sensor is processed by the impedance matching circuit, the signal is divided into two paths in the form of differential signals to be sent into the anti-interference amplifying circuit for gain; the anti-interference amplification circuit amplifies the differential signal in the form of a differential composite operational amplifier; after the output signal of the anti-interference amplification circuit is sent to the frequency selection output circuit for band-pass filtering and frequency selection, a processed signal is sent to the ARM processor by using a voltage follower principle, so that the linearity of ultrasonic signal receiving and processing along with the change of stress is high, the system stress resolution is high, and the detection is more accurate.

Description

technical field [0001] The invention relates to the technical field of bridge construction monitoring, in particular to a blockchain-based bridge construction stress detection system. Background technique [0002] In road and bridge construction, a large number of prestressed designs are used in the superstructure of bridges. Precisely applying prestress according to the design requirements has become an important link in bridge construction. At present, most stress tests use resistance strain gauges or light refraction methods, in which resistance strain gauge sensors can only reflect the surface stress of the tested piece, and the adhesive of the stress gauge will age during long-term use, causing many errors; and The light refraction method has complicated equipment and can only test transparent materials. Ultrasonic method, as a new type of non-destructive stress measurement method, has the advantages of fast and convenient detection, high linear correlation of detectio...

AI Technical Summary

Problems solved by technology

At present, most stress tests use resistance strain gauges or light refraction methods, in which resistance strain gauge sensors can only reflect the surface stress of the tested piece, and the adhesive of the stress gauge will age during long-term use, causing many errors; and The light refraction method equipment is more complicated, and can only test transparent materials

Ultrasonic method, as a new type of non-destructive stress measurement method, has the advantages of fast and convenient detection, high linear correlation of detection signals, and good discreteness, so it is widely used. It mainly includes the transmission and reception of ultrasonic signals. The echo signal is converted into an electrical pulse signal and sent to the ARM processor for calculation and measurement. Since the ultrasonic signal will be accompanied by energy attenuation during the propagation process, the received signal will also introduce clutter, coupled with external temperature, electromagnetic interference, etc. Due to the influence of various factors, the linear relationship between the ultrasonic signal and the stress change is out of balance, resulting in a decrease in the stress resolution and errors in the detection.

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