Prestressed concrete variable-section box girder bridge with internal slant leg rigid frame, and construction method thereof
A prestressing and concrete technology, applied to prestressed concrete variable section box girder bridges with built-in slanted leg rigid frame and its construction field, can solve the problems of outstanding vertical stability of the bottom slab, low stiffness of the roof slab, abdominal O2 stability and box girder resistance To solve problems such as poor torsion capacity, achieve the effects of avoiding cracking of the floor, reducing the flat bending amplitude, and reducing the hollowing rate of the horizontal section
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[0087] The core of the present invention is to provide an upward radial force generated by a mid-span positive moment cable, which eliminates or reduces the influence of the second-stage dead load on the downward deflection of the main girder. The overall structure has high rigidity, small deflection, and strong shear resistance. A prestressed concrete variable-section box girder bridge with oblique-leg rigid frame built in a box-shaped bottom plate with reasonable cable and anchorage positions on the roof, bottom plate and web, and a reasonable box girder structure, and its construction method.
[0088] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0089] Please refer to Figure 21-31 , Figure 21 It is a structural schematic diagram of a prestressed concrete variable-section box gi...
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