Combined H-shaped steel cast-in-situ box beam support adjoining to and overpassing existing lines

Abstract

Provided is a combined H-shaped steel cast-in-situ box beam support adjoining to and overpassing existing lines. The combined cast-in-situ beam support comprises a steel pipe column strip foundation, steel pipe buttresses, triangular diagonal braces on the two sides of steel pipe uprights, main crossbeams and main longitudinal beams. The triangular steel pipe column buttresses, the main crossbeams and the main longitudinal beams are of a combined structure, stress decomposition is conducted on H600 type steel of the main longitudinal beams through the triangular diagonal braces on the two sides of the steel pipe uprights, force is transferred to a transverse pier body and a longitudinal concrete strip foundation, deflection deformation occurring after the H600 type steel of the main longitudinal beams is stressed is greatly reduced under large span conditions, a statically indeterminate structure of the support is formed, structural stability of the support is enhanced, the construction problem that the left space, right space, upper space and lower space of a cast-in-situ box beam adjoining to and overpassing the existing lines are limited is solved, and it is guaranteed that lower deflection of H-shaped steel under large span conditions and the driving clear height of the existing lines are within specified permissible ranges.

Description

technical field [0001] The invention relates to the construction structure of a municipal overpass ramp bridge, in particular to a combined type of close-adjacent and upper-span existing line bridge construction requirements for bridges with limited spans and upper and lower clearances for ramp bridges. H-shaped steel cast-in-place box girder support. Background technique [0002] During the construction of municipal overpass ramps, various construction requirements will be encountered. For example, some construction sites need to solve the construction of ramp bridges with upper spans and bridges close to existing lines, with limited spans and upper and lower clearances. For example, Fuzhou City Fuwan Road upgrade and reconstruction project is located in Cangshan District. The Bayside Interconnection of Fuwan Road Upgrade and Reconstruction Project mainly includes the newly built main line bridge with a length of 136 meters; the newly built 5 ramp bridges, namely J, K, L, M...

AI Technical Summary

Problems solved by technology

The upper structure of the 14-15 span of the J ramp is designed as a single-chamber single-box prestressed box girder. The right width of the Fuwan Old Bridge is 19.677m, and the left width of the bridge is 14.663m. Under the span of 34.34m, the super long span of this bridge is solved. The construction with limited paths and upper and lower spaces has become a technical problem. The existing solution can only control traffic through all enclosures, but this kind of solution has a long cycle and can easily cause traffic congestion in the entire city.

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