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

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...

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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.

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