A rapid detection method for the integrity of prefabricated bridges

Abstract

The invention discloses an integrality quick detection method for an assembly type bridge. The determination method is used for the assembly type bridge or a girder bridge. The assembly type bridge or the girder bridge comprises a plurality of prefabricated slabs or beams in parallel, wherein inter-beam joints are formed between the adjacent prefabricated slabs or beams. The adopted detecting device comprises a vibration wire type stress strain test element, connecting wires, a junction box and a dynamic signal acquisition device, wherein the vibration wire type stress strain test element is sequentially connected with the junction box and the dynamic signal acquisition device through the connecting wires. The integrality quick detection method is to pre-cast vibration wire type strainmeters when constructing the assembly type bridge or overhauling the hinge joints, test the original state after completion of the bridge or overhauling, analyze fundamental frequency of each test point, from then on only periodically open the connecting box to connect the dynamic signal tester to obtain dynamic signals, analyze the fundamental frequency of each test point, and longitudinally compare and judge the change situation of the whole stress performance of the bridge.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for detecting and appraising the overall mechanical performance of the superstructure during the maintenance and management process of an assembled bridge. Background technique [0002] Under the situation of rapid development of road transportation in our country, the construction of all kinds of roads at all levels has also been rapidly expanded. Among the various types of bridges included, the prefabricated simply supported bridge is one of the main bridge types. This prefabricated bridge adopts the assembly method of prefabricating the superstructure first and then pouring concrete connections. The reliability of the cast-in-place connections determines whether the bridge can bear the overall force during operation, and is also the focus of bridge maintenance. [0003] At present, there is no direct and reliable rapid monitoring method for the monitoring ...

AI Technical Summary

Problems solved by technology

Both dynamic and static load tests require special deflection measurement equipment, vibration pickers, and loading vehicles, which are costly, time-consuming, and require interruption of traffic to complete the test, which affects line traffic. Therefore, the regular inspection of bridges mainly relies on manual inspection of pavement integrity and hinges. Judging the leakage of joints is inefficient and highly subjective. Only when the bridge loss is serious, the relevant part arranges dynamic and static load tests. The data obtained at this time are one-time data, and the status of the bridge itself cannot be realized even if it is not continuous. In contrast, the overall force of the bridge can only be judged by comparing the measured value with the theoretical value or empirical value, but in this case, the detection cost is high, time-consuming, and not scientific enough

Therefore, the traditional detection work efficiency is low, the detection cost is high, the comprehensiveness is poor, and the dynamic monitoring of the overall force of the bridge cannot be realized.

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