Concrete filled steel tube void detection system and method

Abstract

The invention discloses a concrete filled steel tube void detection system. The system comprises an infrared thermal imager used for collecting temperature data of a detection surface, a power supply and a wire coil which are used for induction heating, and the wire coil is used for heating steel tube concrete in a form of generating eddy current on the surface of the steel tube; the system further comprises a computer which is provided with concrete filled steel tube void detection software, the software can control starting and stopping of heating and recording of temperature data, the system further comprises a void defect feature extracting program, the program extracts an infrared thermal image obtained from the thermal imager for heat source inversion and temperature prediction, and carries out subtraction on thermal image data obtained by experiments and thermal image data obtained by prediction to extract temperature anomaly features generated by void defects so as to judge whether void exists or not. The invention further discloses a void detection method which is adopted for detection, the void defect of the steel tube of 20 mm and within 20 mm can be quantitatively recognized, operation is convenient, and the detection efficiency is high.

Description

technical field [0001] The invention relates to the field of prefabricated buildings and the technical field of thermal simulation, in particular to a method for detecting voiding of steel pipe concrete by using thermal simulation technology. Background technique [0002] Concrete-filled steel tube structures are widely used in prefabricated buildings, road bridges, nuclear power plants and other projects. The structure is a force-bearing system composed of outer steel tubes and inner-filled concrete. Due to factors such as construction operation technology, concrete shrinkage and creep, long-term load, steel pipe lining steel bars lead to insufficient filling, debonding or voids will occur at the bonding interface between the inner wall of the steel pipe and the concrete, thereby weakening the bearing capacity of the overall structure . Therefore, effective detection of void damage in steel-concrete composite structures has become an actual demand in engineering applicatio...

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Problems solved by technology

[0004] The problem to be solved in the present invention is to design a detection system that can be used for hollow defects of steel pipe concrete with a wall thickness of 20 mm or less in view of the shortcomings of the existing thermal imaging technology for void detection, such as small detection depth and incapable of quantitative detection. ; The invention is easy to use, can be detected by a single person, does not have high requirements for operators, and can quantitatively measure void defects of steel pipe concrete

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