A free-fall hammer automatic rebound device for bridge hammer detection

Abstract

The invention belongs to the technical field of structure monitoring, and relates to a free drop hammer automatic rebounding device for bridge hammering detection. The free drop hammer automatic rebounding device comprises an upper framework ring, a slide way post, a hammer bearing post, a drop hammer, a hammer head, a slide block, a laser sensor, a hammer bearing platform, a bearing table magnetic pad, a drop hammer lower magnetic pad, a drop hammer upper magnetic pad and a lower framework ring. After the drop hammer free falling, the drop hammer can be automatically rebounded to the initialposition, so that the uniform hammering force in each time is ensured; the rebounding process is fully automatically completed.

Description

technical field [0001] The invention belongs to the technical field of structure monitoring, and relates to an automatic rebounding device for a free-fall hammer used for bridge hammer detection. Background technique [0002] In order to ensure the safety of the bridge, it is necessary to carry out regular inspections on the bridge. One of the inspection contents is to measure the modal parameters of the bridge, such as frequency, damping, and mode shape. By comparing these parameters in different periods, the dynamic performance changes of the bridge structure can be understood. , so as to find abnormalities and carry out maintenance measures in advance. [0003] The traditional modal parameter detection method is to use the vehicle to drive through the bridge, measure the vibration signal of the bridge when the truck passes through the sensor arranged in advance on the bridge, and perform modal parameter identification to obtain the modal parameter. The generated excitati...

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Problems solved by technology

However, this method has certain defects. First, it is difficult to control the artificial hammering force. If it is too large, it will damage the pavement of the bridge deck, and if it is too small, it will not stimulate the modal parameters of the bridge structure. The second problem is that for bridges with slightly larger spans, hammering Multiple points are required, which consumes a lot of manpower, and it is difficult to ensure consistent hammering force every time

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