Counterweight method used under condition of unsymmetrical flexibility of bridges on two sides of closure segment during cantilever method construction

Abstract

The invention provides a counterweight method used under the condition of unsymmetrical flexibility of bridges on the two sides of a closure segment during cantilever method construction and belongs to the technical field of bridge construction. The method comprises the following steps of building a finite element model of bridge closure, applying unit vertical force to the end parts of the bridges on the two sides of the closure segment, and calculating the vertical displacement of the end parts and a counterweight position to obtain corresponding flexibility coefficients, and then according to the flexibility coefficients, controlling the height difference between the two sides of the closure segment, the balance weight of the closure segment, and the balance weight sorted unloading weight. The method has incomparable advantages in closure construction under the condition that the flexibility of the bridges on the two sides of the closure segment is unsymmetrical. In a closure casting process of the bridge, the elevations of the bridges on the two sides of the closure segment are not changed all the time, so that linear control on the bridge is facilitated, and the stress of concrete of the closure segment is reduced. The method also has the advantages of simple calculation, easy grasping by personnel of the engineering and the like.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a counterweight method under asymmetric bridge flexibility on both sides of a closing section during cantilever construction. Background technique [0002] Closing is a key link in bridge construction. Alignment control during the closing process is a key factor in construction quality assurance. A reasonable counterweight scheme can make the bridge in the completed state better in alignment and less stress. Regarding the counterweight of bridge closing construction, Li Dinglun disclosed the equal weight, equal bending moment, and equal displacement in "Analysis of the Effect of Mid-span Closure Counterweight of Continuous Rigid Frame Bridge" in "China and Foreign Highways" 2014, (3): 131-134. Counterweight 3 counterweight methods. [0003] The counterweight of equal weight and equal bending moment only considers the force of the bridge. For bridges with asymmetric f...

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Problems solved by technology

[0003] The counterweight of equal weight and equal bending moment only considers the force of the bridge. For bridges with asymmetric flexibility, the inconsistency of the deformation of the bridges on both sides of the closing section under the weight of the concrete in the closing section is not taken into account, which will cause errors in the alignment of the bridge and Larger closing section stress; the equal displacement counterweight method considers that the elevation at the end of the closing section on one side does not change when the concrete is poured, but does not take into account the asymmetrical bridge flexibility on both sides of the closing section. Control and how to distribute the weight of the counterweight on both sides according to the concrete weight of the closing section, and no control method for counterweight unloading is given

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