多跨钢筋混凝土箱型拱桥缆索吊装施工技术

The Cable-Lifting-Erecting Techniques for the Multi-Spanned Reinforced Concrete Box Arch Bridge

箱型混凝土拱桥施工时常采用缆索吊装方法,缆索吊机水平和垂直运输灵活,受气候和地形等条件的限制比较少。详细阐述了江西新干赣江特大桥混凝土箱型拱桥采用3座塔架缆索吊进行水上多跨多段箱型拱吊装的施工技术,包括缆索吊装系统(地锚、塔架及缆索等)的设计、缆索吊装工艺流程、吊装顺序与步骤和关键施工技术。实践证明,利用3座塔架组成一大跨两小跨缆索吊,对箱型拱桥东西两侧同步对称吊装的缆索吊装施工方法,避开了水位变化、通航的影响,占用场地小,施工安全快速,节约了工期和成本。

Owing to the advantages of the cable crane being levelly and vertically flexible in transportation,and being subjected to relatively less climatic and landform limitations,it is often used for the construction of reinforced concrete box arch bridges.The cable-lifting-erecting techniques for the Ganjiang River Mega Concrete Box Arch Bridge,multi-spanned and muti-sectioned,at Xingan of Jiangxi province with three tower cable cranes are dealt with in detail in the paper,with the design of the cable-lifting-erecting system（including the ground anchor,the tower,the cable,etc.）,the cable-hoisting processes,the lifting-erecting sequences,and other key construction techniques presented.Practice shows that the method of making use of three towers to form a one-large-span-and-two-small-span cable crane to perform the symmetrical cable-lifting-erecting construction of the box arch bridge from both the east side and the west side at the same time may help avoid the influence of the change in water level,reduce the affection of the passage of ships,take less construction site,ensure the safety of construction and shorten construction duration,all of which may save much cost.