Fabricated hollow slab girder bridge deep hinge joint defect detection method and device

Abstract

The invention discloses a method and equipment for detecting deep hinge joint defects of an assembly type hollow slab girder bridge, and the method comprises the steps: arranging a detection region at the bottom of the assembly type hollow slab girder bridge, and respectively arranging a transmitting transducer and a receiving transducer at the two sides of a hinge joint seam in the detection region; the actual measurement first arrival sound time Tm of the ultrasonic waves from the transmitting transducer to the receiving transducer is collected; establishing an initial slowness model, performing forward modeling calculation on the initial slowness model, and calculating a ray path matrix R and theoretical first arrival sound time Tc by adopting a ray tracing technology; judging whether a set convergence condition is met or not according to the actually measured first arrival sound time Tm and the theoretical first arrival sound time Tc; and when it is determined that the set convergence condition is met, calculation is ended, and speed distribution and defect recognition results are output. The conditions of non-compact pouring, concrete cavities, damage and the like in the deep hinge joint can be accurately identified, and the accuracy of defect detection is improved.

Description

technical field [0001] The invention relates to the technical field of bridge detection, in particular to a method and equipment for detecting defects in deep hinge joints of an assembled hollow slab girder bridge. Background technique [0002] The prefabricated hollow slab girder bridge is a commonly used structural form of small and medium-span bridges. The slab girders of the superstructure are mainly connected by hinge joints to form a whole to bear the force together. The structure of the hinge joints remains normal for prefabricated hollow slab girder bridges. The working performance plays a key role. The defects and damages of the hinge joints will affect the lateral load transfer of the bridge structure, and in severe cases, the single plate will be stressed. Deep hinged joints are currently the main structural form of hinged joints. Compared with shallow hinged joints, their groove depth is deeper. Due to the limitation of structural space and construction condition...

AI Technical Summary

Problems solved by technology

Deep hinged joints are currently the main structural form of hinged joints. Compared with shallow hinged joints, their groove depth is deeper. Due to the limitation of structural space and construction conditions and the influence of operating loads, deep hinged joints often have poor pouring, concrete voids and There is a big safety hazard in case of damage, etc.

However, since deep hinge defects exist inside the structure, and the coverage of bridge deck pavement makes it difficult to directly observe defects and damage, it is urgent to propose a detection method and equipment for deep hinge defects of prefabricated hollow slab girder bridges.

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