【摘 要】
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In order to meet the widening requirement of urban bridge, this paper proposes a new box girder widening method-steel cantilever widening concrete box girde
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In order to meet the widening requirement of urban bridge, this paper proposes a new box girder widening method-steel cantilever widening concrete box girder method without piers (SCWCBM for short).According to this method, the original bridge deck is widened by the orthotropic steel decks which are layed on the cantilevers at both sides of the box girder.The cantilevers which are setted on both sides of the original box girder are connected to the original box girder by tranverse external prestressing tendons.In this paper, Combined with the practical work, the widening procedure of SCWCBM is detailed.Compared with the general widening methods, SCWCBM has many advantages, such as shorter construction period, open clearance of span, smaller traffic interference, better traffic capacity and better economic benefit.SCWCBM is an effective tailor-made widening method for urban box girder.
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