Simply supported-continuous construction method for bridge superstructure

Abstract

The invention relates to a simply supported-continuous construction method for a bridge superstructure, The method comprises the following steps: firstly, prefabricating standard simply supported small box girders in batch; installing temporary steel brackets at two sides of a bracket steel tube column that is erected on each cushion cap, installing a temporary support with adjustable elevation at the tops of the steel brackets, and lifting the prefabricated simply supported small box girders on the temporary supports arranged on the steel brackets; after that, arranging a transverse prestressed reinforcing steel at the cross beam position between the simply supported small box girders, arranging longitudinal hogging moment bundles through reserved holes arranged at the top surfaces of the simply supported small box girders; pouring concrete into cross beams; and stretching and drawing by use of prestress after the concrete reaches the designed strength to form a two-way prestress continuous beam system. The simply supported-continuous construction method provided by the invention has the characteristics that the simply supported box girder has low manufacturing cost and a simple structure and facilitates industrialized production and lifting work, and a continuous bridge is good in integrity and reasonable in stress, so that the disadvantages that inclined section cracks occur at ends of the simply supported box girders, the bridge surface continuation is liable to damage, and the continuous bridge has high requirement on a foundation and supports and has a complex structure and long construction period can be avoided.

Description

technical field [0001] The invention relates to a construction method of a bridge superstructure, in particular to a construction method of a concrete continuous beam at the top of a bridge. technical background [0002] With the rapid development of expressways in my country, especially for expressways built in the form of elevated within the city limits, the quality requirements for expressway bridge construction have also increased accordingly, and bridge construction technology has attracted more and more attention. At present, expressway bridges generally adopt the form of fabricated prestressed concrete slab girders and T-beams. This technology has the advantages of short hoisting period, low cost, and convenient factory production. However, simply supported beam structures are prone to oblique section cracks. , the bridge deck is easy to be damaged; for long-span bridges, the balanced cantilever pouring method and the bracket cast-in-place method are adopted. , combi...

AI Technical Summary

Problems solved by technology

At present, expressway bridges generally adopt the form of fabricated prestressed concrete slab girders and T-beams. This technology has the advantages of short hoisting period, low cost, and convenient factory production. However, simply supported beam structures are prone to oblique section cracks. , the bridge deck is easy to be damaged; for long-span bridges, the balanced cantilever pouring method and the bracket cast-in-place method are adopted. Combining the above advantages, explore a method that not only has a short construction period of simply supported beams, but also can combine the advantages of continuous beams with good integrity, so that the permanence of concrete continuous beam structures can be better guaranteed

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