Active control method for horizontal bridge turner construction

Abstract

The invention discloses an active control method for horizontal bridge turner construction. The method comprises following construction steps: (1), a prefabricated bridge structure located on a turn plate rotating system is subjected to weighing test, unbalanced moment and spherical hinge friction coefficient of the bridge structure are obtained, then primary counter weight processing is performed, and the structure is in an ideal balance state relative to the turner center; (2), two symmetric active supporting points capable of sliding on a rotary road are formed at the top of the rotary roadin the rotary road intersection position of the girder axis direction and the turn plate rotating system, the tops of the active supporting points are contacted with the bottom of an upper turn plateof the turn plate rotating system, secondary counter weight capable of overcoming the spherical hinge pivoting friction torque of the turn plate rotating system is arranged on any one cantilever sideof the bridge structure, the active supporting points are enabled to be stressed, a supporting state of the turner structure is changed into a simple support stress state jointly supported by a spherical hinge and the active supporting points from a spherical hinge center supporting state, and a bridge turner is subjected to turner construction in the simple support 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 ...

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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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