Variable-cross-section concrete continuous bridge construction method

Abstract

The invention discloses a variable-cross-section concrete continuous bridge construction method, comprising the following steps of constructing a bridge body except a midspan closure segment on a full framing; performing a first stage of dead load analysis on the bridge body except the midspan closure segment according to the stress state of a cantilever beam, and performing a first cross-section reinforcement; removing a support system; performing midspan closure construction; performing a second stage of dead load, live load and additional load analysis and a first stage of dead load analysis of the midspan closure segment according to the stress state of the continuous bridge, and performing a second cross-section reinforcement on the whole bridge body. According to the construction method, the stress state of cantilever pouring construction is simulated by using a support closure method; through simulating a cantilever pouring stress model, the stress state of the variable-cross-section concrete continuous bridge is optimized, the height of the midspan bridge is reduced, the bridge size is decreased, the construction costs are saved, the technical difficulties of construction linear control and the midspan closure are reduced, and the construction period is shortened. Meanwhile, a construction platform with complex sections is provided for landscape modeling by the full framing, and the construction method can be widely used in urban landscape rivers and flyovers.

Description

technical field [0001] The invention relates to a construction method of a beam bridge, in particular to a construction method of a variable-section concrete continuous beam bridge. Background technique [0002] Variable cross-section concrete continuous girder bridges are widely used for their good structural mechanical performance, small deformation, few expansion joints, smooth and comfortable driving, simple and beautiful shape, small maintenance work, and strong earthquake resistance. [0003] At present, there are many construction methods for variable cross-section concrete continuous girder bridges, and the commonly used construction methods are mainly cantilever construction and in-situ pouring construction with full support. According to different construction methods, the variable cross-section concrete continuous girder bridge has different self-weight and dead load stress states of the bare beam. [0004] Before the mid-span closure of the cantilever pouring co...

AI Technical Summary

Problems solved by technology

Under the same conditions, the positive bending moment at the mid-span of the concrete continuous girder bridge constructed with full support is larger than that of the cantilever pouring construction technology, and the negative bending moment at the middle fulcrum is smaller than that of the cantilever

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