Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology

A technology of ultrasonic guided wave and structural length, which is applied in the generation of ultrasonic/sonic wave/infrasonic wave, measuring devices, and the use of ultrasonic/sonic wave/infrasonic wave, etc., which can solve the long-distance detection of high-frequency guided wave modes in concealed columnar steel structures Numerous, attenuated guided wave mode shape design, complex low-frequency guided wave effects, etc., to achieve high power amplifier, meet detection requirements, and large bandwidth effects

Active Publication Date: 2021-01-08
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention proposes a method for measuring the length of a concealed columnar steel structure based on ultrasonic guided wave sound field control technology, which overcomes the inability of the traditional ultrasonic guided wave to measure the concealed columnar steel structure with a cladding layer. Due to the technical defects of long-distance detection of the control structure (many high-frequency guided wave modes, severe attenuation, and no guided wave mode design, low-frequency guided waves have complex effects on the interface and serious energy transmission), unexpectedly realized the use of screened out The long-distance detection of the concealed columnar steel structure by the specific high-frequency guided wave can even complete the long-distance non-destructive detection for the buried depth of more than 3 meters.

Method used

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  • Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology
  • Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology
  • Method and device for measuring length of concealed columnar steel structure based on ultrasonic guided wave sound field regulation and control technology

Examples

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Effect test

Embodiment 1

[0071] Example 1 Non-destructive testing of the length of the slope bolt

[0072] Because of its good anchoring quality, high strength, safety and reliability, bolts are widely used in engineering fields such as municipal engineering, railway and highway construction, and mine roof anchoring. There are many types of anchors, such as: relatively small mine roof anchors, Large-scale slope anchors and foundation pit anchors, etc. There are relatively mature non-destructive testing methods for small-scale mine roof bolts, but there are still technical problems that are difficult to solve for the length non-destructive testing of large-scale bolts. In this embodiment, the non-destructive detection of the length of the slope bolts will be completed through the intelligent selection algorithm of the detection mode and the ultrasonic guided wave sound field control technology. In this example, the diameter of the central rebar is Take the anchor rod as an example, specifically as ...

Embodiment 2

[0082] Embodiment 2 Non-destructive testing of column length of expressway guardrail

[0083] Taking the column widely used as highway guardrail as an example, according to the length measurement method, different detection frequencies and detection modes can be obtained for the column of highway guardrail with different materials, different sizes and different working conditions. For example: the inner diameter of the central column is outer diameter is For the column of the highway guardrail with a length of 2.8m and a buried depth of 2.2m, the main frequency of detection selected according to the length measurement method is 3.4MHz, and the detection mode is T(0,15). Using the selected main frequency and guided wave mode to detect the sample in this embodiment, an end-face echo signal with a very small detection error can be obtained.

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Abstract

The invention relates to a method and device for measuring the length of a concealed columnar steel structure based on an ultrasonic guided wave sound field regulation and control technology, and belongs to the field of nondestructive testing and length measurement. The concealed columnar steel structure is a core-shell structure with a coating layer, such as a side slope anchor rod, a road guardrail stand column and the like. The device comprises a mobile device, a monitoring host and an ultrasonic guided wave transducer which are partially or completely connected in a wired or wireless mode.The method comprises the steps of standard library establishment, main frequency detection, modal detection, wave structure automatic recommendation, transducer working parameter and installation mode automatic recommendation and guided wave sound field regulation and control. According to the method, the guided wave sound field is regulated and controlled by analyzing and using the propagation characteristics of the ultrasonic guided waves and installing and arranging the transducers, so that the received echo signals only contain target modes, the multi-mode problem in traditional ultrasonic guided wave detection is solved, and the method has important engineering significance.

Description

technical field [0001] The invention belongs to the field of non-destructive testing and length measurement, and in particular relates to a method and device for measuring the length of a concealed columnar steel structure based on ultrasonic guided wave sound field control technology. Background technique [0002] In municipal engineering, water conservancy and hydropower, road and railway construction, and various underground projects (tunnels, caverns, etc.), concealed columnar steel structures have been widely used, for example: because of their good anchorage quality, high strength, safety and reliability, It is widely used in anchor rods in slope maintenance due to the advantages of saving materials and reducing costs; it is widely used as columns for highway guardrails because it can effectively reduce the severity of disasters when traffic accidents occur. [0003] The concealed columnar steel structure of the present invention comprises a core layer and a cladding l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/00G01N29/07G01N29/34G01N29/44B06B1/02
CPCB06B1/0223G01B17/00G01N29/07G01N29/34G01N29/4427G01N2291/02458G01N2291/02854
Inventor 唐志峰吕福在崔海瑞张鹏飞
Owner ZHEJIANG UNIV
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