A construction method of continuous beam bridge with steel-concrete composite structure
A combined structure and concrete technology, used in bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of high compressive stress on the roof of steel beams, increased pressure on steel beams, and large loss of precompressive stress on concrete bridge decks.
Active Publication Date: 2012-02-15
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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Problems solved by technology
[0004] Early continuous girder bridges with composite structures usually adopted the method of arranging prestressed tendons to apply prestress to the concrete bridge deck in the pier top area, but this design will lead to a large compressive stress on the steel girder roof, and as the concrete creeps and shrinks With the rapid development, the pressure on the steel girder will be further intensified. At the same time, the loss of precompression stress on the concrete bridge deck is large, and the effect of applying prestress is not good.
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[0026] The embodiment of the present invention is located at the intersection of rivers and seas, where the water area is wide and the water depth is deep. It is suitable for the overall hoisting of large-scale floating cranes, and the surrounding floating crane resources are abundant and easy to use. At the same time, it is considered that the entire span is hoisted in place after the combined structure is formed, and then the fulcrum concrete bridge is constructed. The slab can make the structure bear the force of the simply supported beam of the combined structure under the action of the first stage load, minimize the level of negative bending moment of the fulcrum and ensure the force is economical and reasonable; therefore, for the overall construction plan, the steel beam and the concrete bridge deck are adopted A single-span composite structure is formed in the prefabricated site, and the overall hoisting is in place, the steel beam connection joint construction is carrie...
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The invention discloses a steel-concrete composite structure continuous beam construction method, which is characterized in that: the steel beam and the concrete bridge deck form a single-span beam structure in a prefabricated site, the single-span beam structure is hoisted in place as a whole, and the steel beam connection joint is carried out Construction and re-construction of the concrete bridge deck in the pier top area to form a continuous beam of composite structure. The present invention utilizes the prefabricated site to prefabricate most of the components, utilizes the large-scale floating crane to hoist the entire beam section in place, applies the prestressing method to the concrete bridge deck at the top section of the pier by using the lifting method of the fulcrum at the top of the pier, and utilizes the double combination design of the bottom plate at the top section of the pier to reduce the area The thickness of the steel beam bottom plate ensures the construction quality and speeds up the construction progress, which has extensive and far-reaching reference significance for the design and construction of similar projects in the future.
Description
technical field [0001] The invention relates to the technical field of civil engineering bridge construction, in particular to a construction method for a steel-concrete composite structure continuous beam bridge. Background technique [0002] The construction method of steel-concrete composite structure continuous girder bridge generally adopts the steel girder to be pushed or hoisted in place to form a continuous structure, and the poured concrete bridge deck is reproduced or the precast concrete bridge deck is installed to form a composite structure. [0003] Since the fulcrum of the continuous girder bears the negative bending moment, and the steel-concrete composite structure bridge adopts the arrangement of the upper concrete and the lower steel, the concrete bridge deck of the steel-concrete composite continuous girder bridge is under tension in the negative bending moment section of the pier top, and the steel girder Pressure and unfavorable force have become importa...
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IPC IPC(8): E01D21/00
Inventor 邵长宇卢永成邓青儿张晓松
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP