Device for detecting cavity beneath structural panel by instantaneous impulsion method and detection method thereof

Abstract

The invention discloses a device for detecting cavity beneath a structure panel by the instantaneous impulsion method and a detection method thereof. The device comprises a vibration device, an acceleration sensor, a signal amplifier, a data acquisition instrument and a computer; the acceleration sensor is arranged on a structure panel to be detected; and when the structure panel to be detected is vibrated by the vibration device, the acceleration sensor and the structure panel to be detected vibrate synchronously; and the vibration response signal output terminal of the acceleration sensor is input to the computer after passing through the signal amplifier and the data acquisition instrument sequentially. By utilizing difference between a dense surface layer and a basal body cavity surface layer in the response frequency and the response frequency or amplitude under instantaneous impulsion, the detection device provided by the invention is able to quickly and accurately obtain the results of detection of whether cavity is formed beneath the structure panel, is capable of preventing the detection results from being disturbed by outside noise, is convenient and simple to be operated, provides a accurate reference for early discovery and treatment of cavity beneath the structure panel. The device has the advantages of simple structure and low manufacture cost.

Description

technical field [0001] The invention relates to a detection device and a detection method for a void under a structural panel, in particular to a transient impact method detection device and a detection method for a void under a structural panel. Background technique [0002] The void under the structural panel is formed due to the congenital separation between the panel and the base layer or the recovery of the plastic deflection of the acquired surface layer. For example, after the occurrence of voids under the concrete pavement, due to road maintenance and environmental reasons, the void area will gradually develop with the prolongation of the service life. Due to the existence of the void, the load of the vehicle load that produces the maximum bending and tensile stress in the pavement body has changed, and the value of the maximum bending and tensile stress increases sharply with the expansion of the void area. If it is not detected and treated early, the road slab wil...

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Problems solved by technology

[0003] In order to solve the problem of early detection of voids under structural panels, the patent application No. 200710027724.5 discloses a method for detecting voids under the concrete pavement panel by the acoustic vibration method and a detector. The sound signal of knocking on the pavement panel is obtained through a directional sound sensor. After the computer analysis, the conclusion of whether it is void is obtained; although this method can detect the void of the base layer under the pavement early to a certain extent, it is obviously affected by external interference. When the external noise is large, it will affect the accuracy of detection; at the same time, Knocking on the road itself produces sound, which will also cause errors in the detection results. In addition, because the knocking uses gravity, this method cannot detect voids on vertical surfaces such as walls.

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