An Active Control Method for Bridge Horizontal Swivel Construction

Abstract

The invention discloses an active control method for horizontal swivel construction of a bridge. The construction is carried out according to the following steps: (1) The prefabricated bridge structure on the turntable rotation system is first weighed and tested to obtain the unbalanced bending moment and spherical joint friction coefficient of the bridge structure, and then a counterweight is carried out to make the structure relative to the The center of the swivel body is in an ideal balanced state; (2) Set two symmetrical active support points that can slide on the ring road at the top of the ring road at the intersection of the main beam axis direction and the ring road of the turntable rotation system. The top of the point is in contact with the bottom of the upper turntable of the turntable rotation system, and a secondary counterweight that can overcome the ball hinge friction moment of the turntable rotation system is set on any cantilever side of the bridge structure, so that the active support point is stressed, and the swivel structure The support state of the bridge is converted from the central support state of the spherical joint to the simply supported force state supported by the spherical joint and the active support point, and the swivel construction of the bridge is carried out under the simply supported state.

Description

technical field [0001] The invention relates to an active control method for bridge horizontal swivel construction, which is used for bridge horizontal swivel construction and belongs to the technical field of bridge construction. Background technique [0002] Bridge swivel construction is a more popular bridge construction method in modern times. It is widely applicable to various types of bridge construction, especially for bridge construction under special conditions such as crossing existing lines, deep trenches and canyons. The obvious advantage of small range and short time. The common bridge swivel construction is to divide the whole span of the bridge or divide it into two half-spans from the middle span, set the turntable rotation system at the appropriate position, and then prefabricate according to the principle of symmetrical balance. After the prefabrication is completed, the center of gravity of the rotation system basically falls on the turntable rotation At ...

AI Technical Summary

Problems solved by technology

[0004] During the actual swivel construction process, the bridge structure is in an ideal balanced state. Due to the inevitable errors in the installation of the spherical joints, and the influence of other factors such as wind force in the natural environment during the construction process, random swings and vibrations are inevitable during the swivel process. , it is bound to cause impact on the structure. If the sway and vibration are more obvious, it will seriously affect the structural safety and overall stability during the swivel construction process.

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