Cantilever cast prestressed composite support system and construction method for large-span box girder

Abstract

The invention relates to a long-span box girder cantilever cast-in-place assembled prestressed composite support system, which includes caps, steel tubular columns, pier columns, multi-section steel main girders, section steel distribution beams, unit pre-assembled quick-connecting supports, box girder side formwork, box girder, steel plate steel tubular column scissor braced steel tubular columnpre-embedded positioning supports, long-span box girder cantilever casting composite support system, long-span box girder cantilever casting section reaction preloading system and long-span box girdercantilever casting section formalization support system. The lower part of the steel tube column is connected with the bearing cap through a steel tube column embedded positioning support; a steel tube column shear brace is arranged between each steel tube column-; The upper part of the steel pipe column is provided with a multi-section steel main beam, a section steel distribution beam and a platform steel plate; The upper part of the platform steel plate is provided with a unit-type pre-assembled quick-connecting bracket, and the upper part of the unit-type pre-assembled quick-connecting bracket is provided with a box girder side template. The invention has the advantages of adopting a limit embedded frame plate for guiding installation, effectively improving the installation speed of the steel pipe column, improving the installation precision of the steel pipe column, and convenient construction.

Description

technical field [0001] The invention relates to a large-span box girder cantilever assembly prestressed composite support system and a construction method, which belongs to the field of civil engineering and is suitable for the construction of a large-span box girder cantilever assembly prestressed composite support system. Background technique [0002] With the rapid development of social economy, bridge engineering has become the focus of people's attention. At this stage, the role of highway bridges in our country in social and economic development is becoming more and more prominent. People are more concerned about the style, structure and aesthetics of continuous bridges. requirements are also increasing. With the development of science and technology in our country, the construction technology of continuous box girder construction is also changing with each passing day. Among them, the most widely used is the construction structure of long-span concrete continuous box...

AI Technical Summary

Problems solved by technology

The use of bracket construction not only makes the foundation treatment more difficult, but also reduces the safety

Moreover, the investment in materials and personnel is also relatively large.

In the construction process of the cantilevered prestressed composite support system for large-span box girders, problems such as difficult installation and positioning of steel pipe columns, poor support stability, poor support preloading effect, and complicated moving process of formwork support are prone to occur.

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