长江悬索桥钢箱梁全回转吊装系统研发与应用

Development and Application of Full Swing Hoisting System for Steel Box Girder of Yangtze River Suspension Bridge

以重庆长寿长江二桥施工为例,针对长寿二桥悬索桥主桥钢箱梁结构特征,结合三峡库区长江主航道高落差水位环境,综合对比分析了跨缆吊机与缆索吊机的技术经济指标,最终采用缆索吊机进行本桥钢箱梁吊装实施;此外,还有效利用悬索桥结构对吊装系统进行设计与优化,包括利用锚碇压重块进行缆索吊的锚固点设计和在主塔上横梁位置布置转索鞍位置、凭借自主研发的全回转吊具进行定点起吊主梁等,同时引入了全智能监控操作系统进行辅助实施,成功攻克了三峡库区长江主航道高落差水位大型悬索桥钢箱梁吊装的关键技术难题,实现了吊机轻量化,避免在长江岸地搭建存移梁支架,有效保护了长江河道生态环境,实现绿色施工,节约了场地和材料,降低了建设费用,相关经验可为今后类似工程实施提供参考。

Taking the construction of the second Changshou Yangtze River Bridge in Chongqing as an example,according to the structural characteristics of the steel box girder of the main bridge of the second Changshou suspension bridge,combined with the high drop water level environment of the main channel of the Yangtze River in the Three Gorges Reservoir area,this paper comprehensively compares and analyzes the technical and economic indexes of the cross cable crane and the cable crane,and finally uses the cable crane to hoist the steel box girder of the bridge;in addition,the suspension bridge structure is also effectively used to design and optimize the hoisting system,including the anchor point design of the cable crane using the anchor weight block,the location of the swivel saddle at the beam on the main tower,and the fixed-point hoisting of the main beam with the self-developed full swing sling.At the same time,the full intelligent monitoring operating system is introduced for auxiliary implementation,which has successfully solved the key technical problems of steel box girder hoisting of large suspension bridge with high drop water level in the main channel of the Yangtze River in the Three Gorges Reservoir area,realized the lightweight of the crane,avoided the construction of beam storage and transfer support on the bank along the Yangtze River,effectively protected the ecological environment of the Yangtze River,realized green construction,saved site and materials and reduced construction costs.The relevant experience can provide reference for the implementation of similar projects in the future.