Construction method of reinforced concrete box girder

Abstract

The invention relates to a construction method of a reinforced concrete box girder, which comprises the following construction steps: 1, placing a steel box girder body on the ground, and pouring andmaintaining bridge deck concrete and flange plate concrete on the ground; 2, installing scaffold units on the ground on the same outer side faces of two bridge piers, and the scaffold units extend into the bottoms of flange plates of a first reinforced concrete box girder; 3, hoisting the first reinforced concrete box girder, loosening hooks, stressing the scaffold units, supporting the flange plates, and therefore preventing the reinforced concrete box girder from overturning due to the eccentric effect; and 4, hoisting the second reinforced concrete box girder, wherein the second reinforcedconcrete box girder is not loosened after being in place, and using a long-strip angle steel to weld with two steel box girder bodies, so that the two steel box girders are pulled and connected into awhole, and the second reinforced concrete box girder is prevented from overturning. The construction method has the technical effects that the construction period of the reinforced concrete box girder is short, and hoisting is safe.

Description

technical field [0001] The invention relates to the technical field of steel-concrete bridge construction, in particular to a construction method of a steel-concrete box girder. Background technique [0002] In the bridge construction of the approach line of Beijing Daxing Airport, steel-concrete box girders were used. Steel-concrete box girders use steel box girders as the main structure, pour concrete bridge decks on the upper surface of the steel box girders, and pour concrete flange plates on the outside of the steel box girders. Each span of the bridge is spliced ​​by two parallel steel-concrete box girders. The conventional construction process is: fabrication of steel box girders—delivery of steel box girders to the site—hoisting of the first steel box girder to the bridge pier—hoisting of the second steel box girder to the bridge pier—connection of two steel box girders— —Installing the flange slab formwork and brackets——Pouring bridge deck concrete and flange slab...

AI Technical Summary

Problems solved by technology

[0004] The one-span steel-concrete box girder connected to the swivel girder can only be constructed after the swivel girder completes its rotation. However, the construction period of Daxing Airport is tight. Formwork installation, pouring, maintenance, formwork removal and other processes are required, and it takes at least 20 days, which seriously affects the opening plan

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