Split streamline steel-concrete composite box girder

Abstract

The invention discloses a split streamline steel-concrete composite box girder comprising two or three horizontal steel-concrete composite box girder units. An air nozzle is disposed outside each steel-concrete composite box girder unit. A channel 4m-20m in horizontal width is formed between each two steel-concrete composite box girder units. Connecting beams are disposed at intervals of 4m-20m longitudinally along the channels. A top plat of each steel-concrete composite box girder unit is a concrete plate, and a bridge deck pavement for automobiles is paved on the top plate; a bottom plate and an oblique web in each girder unit are reinforced steel plates; rails for trains or light rail vehicles are arranged on the bottom plate; each oblique web is provided with round, elliptical or polygonal light holes. The split streamline steel-concrete composite box girder has the advantages that wind proofing stability of bridges can be improved effectively, vortex-induced vibration is suppressed, durability of the bridge deck pavement is improved, and the girder is applicable to highway bridges or highway and light-railway bridges and is simple in structure and well economical.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a split-type streamlined steel-concrete composite box girder for long-span bridges. Background technique [0002] Split steel box girder is a main girder form of long-span cable-stayed bridges and suspension bridges. This type of main girder is used in Stonecutters Bridge in Hong Kong, Xihoumen Bridge in Zhoushan Liandao Project in Zhejiang, Dagu River Channel Bridge in Qingdao Bay Bridge It is used in many bridges such as Yi Sunshin Bridge in South Korea. [0003] The results of bridge field measurement and wind tunnel test show that, for long-span cable-stayed bridges and suspension bridges using split steel box girders as the main girder, due to the low damping of the main girder of the steel structure, the main girder may be relatively heavy under certain wind speed conditions. Large-amplitude vortex-induced vibration. The vortex-induced vibration of the bridge g...

AI Technical Summary

Problems solved by technology

[0004] The engineering practice of many long-span cable-stayed bridges and suspension bridges at home and abroad shows that the orthotropic steel deck roof of the steel box girder main girder and the automobile deck pavement laid on it cannot be well synergistic. The short service life and poor durability of surface paving is an international problem

Images