A variable-section fish-belly cast-in-place concrete box girder concrete stagger prevention structure and construction method

Abstract

The invention discloses a variable-section fish belly type cast-in-place box beam concrete slab staggering prevention structure. The structure comprises a box beam segment and a bottom steel die plate; a slab staggering compensation part formed by thin board laying is arranged at the slab staggering position between the box beam segment and the bottom steel die plate, and is fixed to the steel die plate through a rivet, putty is laid on the top of the slab staggering compensation part, and the slab staggering compensation part achieves the original die plate arc curve effect. Meanwhile, a corresponding construction method is provided. The structure and the construction method solve slab staggering, caused by prestress tension, between variable-section fish belly type cast-in-place box beam segments, construction speed is high, the cost is low, compared with a traditional later slab staggering position treatment construction method, the method has practicability, and construction appearance quality is improved.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering construction, and in particular relates to a variable-section fish-belly cast-in-place concrete box girder concrete dislocation prevention structure and a construction method. Background technique [0002] In recent years, with the rapid development of the construction industry, urban bridges have higher and higher requirements for landscape, and fish-belly box girders are often used in design. Fish-belly box girder bridges have the characteristics of beautiful appearance and conform to the aesthetic design of bridges. Most of the continuous belly box girders are of constant section, and the formwork assembly is relatively regular in the construction of the box girder, while the shape and structure of the fish-belly steel box girder with curved variable cross-section are complex, which brings new challenges to the construction. During the construction of each segment of the fish-belly c...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the rapid development of the construction industry, urban bridges have higher and higher requirements for landscape, and fish-belly box girders are often used in design. Fish-belly box girder bridges have the characteristics of beautiful appearance and conform to the aesthetic design of bridges. Most of the continuous belly box girders are of constant section, and the formwork assembly is relatively regular in the construction of the box girder, while the shape and structural form of the fish-belly steel box girder with curved variable cross-section are complex, which brings new challenges to the construction

When the fish-belly continuous steel box girder with curved and variable cross-section is constructed in each section, due to the prestressed tension, the construction joints of the first construction section and the second construction section are staggered, and the surface perception quality is poor

Usually, the traditional method is to carry out surface decoration treatment after the box girder construction is completed. Due to the difficulty of high-altitude operations, the quality cannot be guaranteed, and the treatment cost is also high. Therefore, it is difficult to guarantee the construction quality and quality if the traditional construction technology is used. The overall fluency of the appearance of the landscape bridge, and the increase in construction difficulty will greatly extend the construction period

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