Bridge weighing method

Abstract

The invention provides a bridge weighing method which comprises the following steps of selecting at least two measurement positions on a bridge, applying gradually changing jacking force on the two measurement positions, recording the magnitude of the jacking force on the two measurement positions at the moment that a spherical hinge slightly rotates, and respectively recording the distances between the two measurement positions and the center of the bridge, and calculating the eccentric bending moment of the swivel beam and the frictional resistance moment of the spherical hinge according to a moment balance principle. According to the bridge weighing method, multi-point cooperative weighing is realized by dispersing the action points of the jacking force, so that the concentrated jacking force applied to the turntable on the pier bottom is reduced, the construction structure is optimized, the construction cost is saved, and the weighing problem in the super-tonnage swivel bridge engineering is solved.

Description

technical field [0001] The invention is applied in the field of bridge engineering, and in particular relates to a bridge weighing method. Background technique [0002] Bridge weighing refers to the two most important parameters of the center of gravity of the swivel structure and the friction coefficient of the spherical joint are measured by weighing the bridge before the construction of the bridge swivel. For conventional small-tonnage swivels, a starting point is generally set under the upper turntable at the bottom of the pier, and the conventional jacking force is applied with a jack to realize bridge weighing. According to the principle of swivel weighing, the frictional resistance Mz of the spherical hinge, The weight G, spherical radius R, and friction coefficient μ are proportional to the three parameters. Therefore, when the weight of the bridge is larger, the frictional resistance of the spherical hinge will increase accordingly, and the jacking force that needs ...

AI Technical Summary

Problems solved by technology

For conventional small-tonnage swivels, a starting point is generally set under the upper turntable at the bottom of the pier, and the conventional jacking force is applied with a jack to realize bridge weighing. According to the principle of swivel weighing, the frictional resistance Mz of the spherical hinge, The weight G, spherical radius R, and friction coefficient μ are proportional to the three parameters. Therefore, when the weight of the bridge is larger, the frictional resistance of the spherical hinge will increase accordingly, and the jacking force that needs to overcome the frictional resistance will be greater accordingly. If the traditional method is still used to set a lifting point under the upper turntable at the bottom of the pier, the required lifting force will be very large, and many large-tonnage jacks must be arranged to meet the requirements of the lifting force, so the size of the turntable at the bottom of the pier will vary Only by increasing and thickening can the structural safety be satisfied, which will lead to an increase in project cost

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