Ultrasonic detection device and method for corrosion of inhaul cable steel wire

Abstract

The invention relates to an ultrasonic detection device and a method for corrosion of an inhaul cable steel wire, the device comprises a dry coupling ultrasonic probe assembled in a limiting packaging structure, the limiting packaging structure is connected with a detected steel wire, the detected steel wire abuts against the end part of the dry coupling ultrasonic probe, an upper computer is connected with ultrasonic transceiver equipment, is used for transmitting a control instruction and processing data information to obtain a corrosion detection result of the detected steel wire; the ultrasonic transceiver equipment is connected with the dry coupling ultrasonic probe and is used for outputting an excitation signal to the probe and acquiring data information returned by the probe; and the dry coupling ultrasonic probe is assembled with the limiting packaging structure, is used for selecting excitation modes and is fixedly connected with the detected steel wire. Compared with the prior art, the device is low in manufacturing cost and convenient to operate, the inhaul cable steel wire can be rapidly detected through single-point excitation, extra damage and pollution to a cable body are avoided, the wire breaking condition can be detected, and meanwhile the corrosion condition can be positioned and evaluated.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to an ultrasonic testing device and method for cable steel wire corrosion. Background technique [0002] As an important part of a cable-stayed bridge, the main cable system is generally composed of parallel steel wire bundles made of high-strength galvanized steel wires, which can transfer the load and dead load of the span structure of the cable-stayed bridge to the main tower. The main load-bearing part of the structure. However, during the service period of the bridge, affected by the external environment (such as vehicle load, wind load, temperature change, etc.), the main cable system is subjected to alternating loads with changing magnitude and acceleration for a long time, which is prone to fatigue effects and lead to cable failure. In addition, the main cable system is generally exposed to the natural environment, especially in areas with severe air pollutio...

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Problems solved by technology

Among them, the visual detection method can only distinguish the obvious damage on the surface of the cable body, but cannot distinguish the fine damage on the surface layer and the internal damage of the cable body, which cannot meet the requirements of the overall safety assessment of the cable, and is only suitable for inspection Auxiliary detection means; in the detection of broken wires and defects in peripheral cables, magnetic flux leakage detection technology has achieved certain results, but this method is difficult to detect in the anchorage area; acoustic emission technology is a passive monitoring method. It is used to monitor the cable force and broken wires. It is difficult to monitor the corrosion of the cable body, and it is impossible to quantitatively analyze the damage size; it is difficult for the ray detection technology to penetrate into the anchorage area, and the equipment is expensive and heavy, and it is inconvenient to use

[0004] For ultrasonic guided wave technology, Chinese patent CN101393173A proposes a non-destructive testing method based on magnetostriction, which applies an instantaneous excitation magnetic field to the magnetic material, and then excites the guided wave in the component, and then obtains the reflected wave signal through the inverse magnetostrictive effect. According to the reflected wave signal to analyze the damage status of the tested component, but the excitation signal of this scheme is relatively weak, and it is difficult to detect the central steel wire of the cable body, and the ultrasonic guided wave technology based on piezoelectric excitation has a great impact on the stress, corrosion, defects, and damage of the cable. The detection of broken wires has certain advantages, especially in the anchorage area. However, due to the long-term influence of factors such as rain, the anchorage area of ​​the cable is far more prone to corrosion damage than other parts, resulting in broken wires.

Chinese patent CN107843651A adopts the method of sending and receiving ultrasonic signals to excite and receive ultrasonic signals to realize defect detection. By processing the received ultrasonic guided wave signals, the damage position and damage depth of the steel wire can be analyzed. However, this method requires two detection surfaces and is difficult to apply. Big

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