Method for monitoring safety state of pier-beam bearing connection part

Abstract

The invention discloses a method for monitoring a safety state of a pier-beam bearing connection part. The method comprises the following steps of: obtaining coordinates of a contour line of a main beam end face (a support connection part) through fixed-point or multi-view photography, comparing the coordinates with coordinates in different periods to obtain a coordinate difference, analyzing the coordinate difference, and obtaining displacement and deflection data of the contour line in different periods; and evaluating and predicting the safety condition of the structure according to analysis of previous displacement and deflection data. The whole process is simple and convenient, hidden danger diseases related to safety of the main beam and pier supporting connection structure can be found economically, efficiently, timely and accurately, and safe use of a bridge is ensured; the equipment adopted by the method is low in manufacturing cost and convenient to install and maintain (operation is conducted only on the pier top); the obtained information is comprehensive, and the displacement and corner information of the beam end basically reflects the overall condition of the main beam structure, so that the pier-beam connection state is reflected comprehensively and accurately.

Description

technical field [0001] The invention belongs to the field of engineering structure safety monitoring / detection maintenance, and in particular relates to a method for monitoring the safety state of a pier-beam support connection part. Background technique [0002] Conventional span bridges account for about 90% of the total mileage of bridges. The main girder of conventional span bridges generally adopts simply supported girders or continuous girders, and the non-fixed connection method with special supports is usually used between them and the pier. The advantage is that it can It is better adapted to the thermal expansion and contraction deformation of the main girder under the change of ambient temperature; but there are also accidental loads (such as vibration, impact, lateral horizontal force or bias pressure or accidental loads such as earthquakes), which cause excessive displacement of the main girder or bridge piers Deformation, leading to the risk of major safety acc...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, manual regular inspection is generally used to detect and control the relative displacement and deformation state of the connection between the main girder and the pier support. The main problem is that it is impossible to implement high-frequency detection and timely forecast the main girder and pier support. Due to the displacement status of the connection parts, there may be a safety risk of falling beams during the long period of regular inspections

Based on the existing displacement sensor monitoring system, high-frequency monitoring of the connection status of the main girder and the pier support can be realized. However, due to the complexity of the relative linear displacement and angular displacement in each direction of the connection between the main girder and the pier support, one pier needs multiple displacement sensors. Monitoring, resulting in the high cost of monitoring the connection state of a single pier-beam support, it is difficult to popularize and apply in conventional span bridges with large quantities and wide areas

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