Safety early-warning beam structure and early-warning method of mid-supporting arch bridge without longitudinal girder

Abstract

The invention relates to a safe early warning beam structure for a longitudinal-beam-free middle bearing type arch bridge and an early warning method of the structure. A structure of the longitudinal-beam-free middle bearing type arch bridge does not adopt a longitudinal main beam, and when a hanging rod of the arch bridge fractures, beam falling accidents can be caused. The safe early warning beam structure comprises a continuous longitudinal beam consisting of a middle spanning connecting beam, a middle spanning support beam, a side spanning connecting beam and a side spanning support beam, wherein the continuous longitudinal beam extends to a cross beam between ribs, the middle spanning support beam forms a bag hanger on the hanging rod cross beam through the cross beam support beam and the connecting hanging rod, the top surface of the middle spanning connecting beam is provided with a longitudinal semitransparent communicating pipe, the inside of the middle spanning connecting beam is filled with low-volatility lubricating oil, the liquid level height differences of lubricating oil at the two ends of the communicating pipe are observed by the semitransparent communicating pipe, and the monitoring on the deformation of the middle spanning connecting beam is realized. The structure and the method have the advantages that the longitudinal beam basically bears no load in the operation stage, when small probability events such as hanging rod fracture occur, the longitudinal beam starts to take effects, the occurrence of the beam falling accidents is prevented, through the adopted communicating pipe, the deformation condition of the longitudinal beam can be observed, and the feasibility of monitoring the hanging rod safety on the basis of longitudinal beam deformation is improved.

Description

technical field [0001] The invention belongs to the technical field of highway and bridge construction, and in particular relates to a safety early warning beam structure and an early warning method for a mid-support arch bridge without longitudinal girders. Background technique [0002] The arch bridge without longitudinal girders is a form of arch bridge built more in the early days. The dead load and live load of the upper part act on the bridge deck, pass through the bridge deck to the beam, from the beam to the suspender, and then to the main arch rib, and finally through the bridge deck. The main arch rib is transmitted to the abutment and the foundation, the force is clear and the construction is convenient. Since the structure does not use a longitudinal main girder, when the suspension rod of the arch bridge breaks, it will cause a girder falling accident and pose a threat to the safety of vehicles driving on the bridge. [0003] After the suspenders of Korla Kongq...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a safety early warning beam structure and early warning method of a vertical arch bridge without longitudinal girders, so as to overcome the large section size and high cost of the newly added longitudinal girders in the reconstruction of the vertical arch bridge without longitudinal girders in the prior art, and it is difficult to adjust the suspenders. Early warning for safety, easy to cause damage to the original structure, and complex structural stress

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