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Ultrasonic thermal excitation stroke adaptive loading device and method for concrete mesoscopic defects

A loading device and concrete technology, which is applied in the field of hidden defect detection in concrete engineering, can solve the problems of strict process control requirements, complicated coupling pressure application device, difficulty in adapting to large-scale detection requirements, etc., to achieve efficient recovery, convenient layout, and simple operation Effect

Active Publication Date: 2022-07-15
NANJING HYDRAULIC RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the complex coupling pressure applying device and harsh process control requirements in the prior art, and it is difficult to adapt to the detection requirements of large-scale concrete member mesoscopic defects and multiple excitation sources under engineering conditions, and proposes the ultrasonic thermal excitation stroke of concrete mesoscopic defects Adaptive loading device and method

Method used

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  • Ultrasonic thermal excitation stroke adaptive loading device and method for concrete mesoscopic defects
  • Ultrasonic thermal excitation stroke adaptive loading device and method for concrete mesoscopic defects
  • Ultrasonic thermal excitation stroke adaptive loading device and method for concrete mesoscopic defects

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Embodiment 1

[0030] An ultrasonic thermal excitation stroke adaptive loading device for concrete mesoscopic defects, including: a rigid fixing unit 1, a semi-flexible supporting unit 2 and a rigid loading unit 3, and the rigid fixing unit 1 and the excited object are bonded and connected by a cured adhesive , the upper side of the rigid fixing unit 1 is threadedly connected to the lower end of the semi-flexible supporting unit 2, the upper end of the semi-flexible supporting unit 2 is threadedly connected to the lower side of the loading unit 3, and the rigid fixing unit 1, the semi-flexible supporting unit 2 and the rigid loading unit 3 are from bottom to top Connected in sequence to form a rigid system consisting of adhesive, rigid fixing unit 1 and rigid loading unit 3, matching the coupling pressure of semi-flexible support unit 2, the ultrasonic thermal excitation stroke adaptive loading device is stably applied, and the excitation stroke adaptive loading device functions The object is...

Embodiment 2

[0042] Example 2: Based on Example 1, but with the following differences:

[0043] refer to image 3 , using the method in Example 1, the middle of the 430mm×400mm×100mm concrete block was wedged and split to produce transverse cracks, but the cracks did not completely penetrate the test block in the transverse direction, and the crack opening width was 0.01~0.38mm . Use the pressure clamp and the excitation stroke adaptive loading device in turn to apply 1500N coupling pressure to the 40kHz ultrasonic transducer with a rated power of 50W, connect the ultrasonic circuit to excite the concrete sample for 10s, and capture the thermal image, such as image 3 .

[0044] from image 3 It can be seen from the two loading methods that the cracks in the thermal images are excited with a visible temperature rise: image 3 In (a), the difference between the temperature rise at the identifiable crack and the temperature rise of the surrounding concrete is mainly concentrated in 0.3~0...

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Abstract

The invention discloses an ultrasonic thermal excitation stroke adaptive loading device and method for concrete mesoscopic defects, and belongs to the technical field of detection of hidden defects in concrete engineering. Compared with the coupling pressure itself, it can be ignored; the toughness and fatigue strength of the excitation stroke adaptive device meet the action of the coupling pressure of 4000N, and it will not be brittle when it is excited at a frequency of 100kHz for a long time; Simple, easy to set up, efficient to recover, suitable for multi-stimulus source detection of a large range of length and time span in practical engineering.

Description

technical field [0001] The invention relates to the technical field of detection of hidden defects in concrete engineering, in particular to a device and method for self-adaptive loading of concrete meso-defects by ultrasonic thermal excitation stroke. Background technique [0002] In the service environment of concrete engineering, there is a certain time span from the occurrence of defects to the structural damage. If the microscopic defects in the early stage of development can be effectively identified, the level of disaster disposal can be advanced to the budding stage of damage, and the ability of engineering risk prevention and control can be fundamentally improved. . However, due to the strong concealment of meso-defects, detection is difficult. In recent years, the discovery of concrete micro-cracks based on ultrasonic excitation infrared thermal imaging has gradually been studied, but it has not been widely used in engineering. One of the important reasons is tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/72
CPCG01N25/72
Inventor 汤雷贾宇王承强梁嘉辉张盛行官福海王玉磊
Owner NANJING HYDRAULIC RES INST
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