Control method for synchronous construction survey of pylons and beams of cable-stayed bridge

Abstract

The invention relates to a control method for synchronous construction survey of pylons and beams of a cable-stayed bridge. The control method comprises the following steps of: erecting high-precision total stations on forced centering observatories of pylons, which are arranged on two sides of a bridge, for observing monitoring points embedded on side walls of segments of the constructed pylon to obtain deflection of the monitoring points; further obtaining a deviation mathematical model of the constructed segments according to the deflection of the monitoring points; and then calculating the correction data of positioning of segments to be poured according to the deviation mathematical model of the constructed segments. The control method has the advantage of conveniently carrying out accurate positioning on the pylons and cable ducts, and is applied to the field of the cable-stayed bridge.

Description

technical field [0001] The invention relates to a cable-stayed bridge, in particular to a method for measuring and controlling synchronous construction of a cable-stayed bridge tower and girder. Background technique [0002] Cable-stayed bridge, also known as cable-stayed bridge, is a bridge in which the main girder is directly pulled on the tower column by many cables. a structural system. It can be regarded as a multi-span elastically supported continuous beam with cables instead of piers. It can reduce the bending moment in the beam body, reduce the height of the building, reduce the weight of the structure, and save materials. A cable-stayed bridge consists of tower columns, main girders, and cable-stayed cables. Cableway tubes are installed on both sides of the tower body and the main beam along the bridge, and the stay cables pass through the cableway tubes and are fixed on the anchor plates of the tower body and the main beam by anchoring devices. The cable-stayed...

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Problems solved by technology

[0005] When the tower-beam synchronous construction technology is adopted, the weight of the main girder on both sides of the tower column is not completely equal, the temporary load on the bridge face is unbalanced, the oil pressure gauge for tensioning the cable to control the cable force, and the error of the tensioning system cause the tower to lose weight. If the column is subjected to uneven horizontal force, the tower column is likely to have a large deviation, which will cause great difficulties for the construction of the subsequent tower column segment, and it is difficult to ensure the straightness of the tower column. Therefore, for the synchronous construction of the tower beam The new construction technology should also adopt corresponding measurement and control methods to make the subsequent construction of the tower column straight

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