Formwork support structure and construction method of variable cross-section cast-in-place box girder with flat and longitudinal curve combined section

Abstract

The invention relates to a mold supporting structure for a variable cross-section cast-in-place box girder at a section combining horizontal and longitudinal curves. The mold supporting structure mainly comprises an all-round scaffold, adjustable inclined supports, synchronous hydraulic jacks, composite moulds and adjustable supporting bases, wherein the all-round scaffold is formed by the overlapping connection of scaffold sets; the synchronous hydraulic jacks and the adjustable supporting bases are uniformly arranged at the joints of longitudinal supporting beams and transverse supporting beams at the top; the synchronous hydraulic jacks and the adjustable supporting bases are used as an upper part supporting body system, and a bottom mold is mounted on the top surface; the mounting angle of each lateral mold is adjusted through the adjustable inclined supports, and the lateral molds are fixedly connected with the bottom mold and an inner mold; custom-made steel templates are arranged at chamfers and circular-arc parts of the variable cross-section cast-in-place box girder; a core mold of the variable cross-section cast-in-place box girder is supported by an internal scaffold, and is fixed to the lateral molds through opposite-pull screw rods. Through the adoption of the mold supporting structure disclosed by the invention, the three-dimensional control for the moulds of the cast-in-place box girder at the section combining horizontal and longitudinal curves is realized, and besides, the uniform stress for the scaffold during concrete pouring can be guaranteed. The invention further provides a construction method of the mold supporting structure for the variable cross-section cast-in-place box girder at the section combining horizontal and longitudinal curves.

Description

technical field [0001] The invention relates to a formwork support structure and a construction method of a variable cross-section cast-in-place box girder with a combination of horizontal and vertical curves. It belongs to the field of bridge engineering and is suitable for the construction of variable section cast-in-place box girder curve sections (horizontal curve sections, vertical curve sections, and flat and longitudinal curve combined sections). Background technique [0002] In recent years, with the development of urban bridges, in addition to meeting the basic requirements of traffic, the design function of modern bridges has added requirements such as landscaping, which has led to the emergence of more bridges with complex structures and various forms. The superstructure of many large and medium-sized bridges in China has adopted variable cross-section cast-in-place box girders, and the construction methods are different. [0003] Common construction methods for ...

AI Technical Summary

Problems solved by technology

At present, there are similarities in the construction process and quality control points of the construction methods of variable cross-section cast-in-situ box girders constructed by the full house support method, and the main emphasis is on less support material investment, high material turnover rate, short construction period, and reduced foundation treatment. In terms of engineering quantity and other indicators, no clear requirements have been put forward for the key points of construction quality control of the combined section of horizontal and vertical curves, especially in the deformation treatment of the scaffold after preloading and preloading and the side form support of the longitudinal curved surface.

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