六景郁江特大桥钢混段钢箱梁吊装关键技术研究

Research on Key Technologies for Hoisting Steel Box Girders in the Steel-Concrete Section of the Liujing Yu River Grand Bridge

南玉铁路六景郁江特大桥采用(41+109+320+109+41)m钢混部分斜拉桥跨越郁江主航道,主梁由混凝土梁、钢混结合段、钢箱梁三部分组成,由于钢混结合段位于航道中间,无法采用传统支架法施工,需采用悬灌施工工艺。本文结合该工程特点对钢混段进行方案设计研究,创新了钢混段钢箱梁吊装施工工艺,通过将大节段施工所使用的造桥机改造为桥面吊机,利用2台450 t智能连续千斤顶,实现对钢梁的同步提升。同时吊机设置纵向、横向调整功能,研发可调节吊具,实现钢梁吊装前后的精确调位,定位精度高,施工安全、快捷高效。

The Nanyu Railway Liujing Yu River Grand Bridge adopts a(41+109+320+109+41)m steel-concrete partial cable-stayed bridge to span the main channel of the Yu River.The main girder is composed of the concrete beam,steelconcrete combined section,and steel box girder.Since the steel-concrete combined section is located in the middle of the channel,the traditional bracket method can't be used for construction,and the cantilever pouring construction technology needs to be used.This paper conducted scheme design and research on the steel-concrete section based on the characteristics of the project,and innovated the hoisting construction technology for the steel box girder in the steel-concrete section.By transforming the bridge fabrication machine used in the construction of the large section into a bridge deck crane,two 450 t intelligent continuous jacks were used to realize the simultaneous lfting of steel girders.Meanwhile,the crane was equipped with vertical and horizontal adjustment functions,and adjustable slings were developed to achieve precise positioning before and after hosting the steel girder.The positioning accuracy was high,and the construction was safe,fast,and efficient.