后填芯法降低悬索桥锚碇散索鞍位移研究  

Reduction of Cable Saddle Displacement in Anchorage of Suspension Bridge Using Post Filling Method

作　　者：王建[1] 张怀远[1] 柴丽莎[1] 

机构地区：[1]河海大学水利水电学院,南京210098

出　　处：《南水北调与水利科技》2014年第4期198-201,共4页South-to-North Water Transfers and Water Science & Technology

摘　　要：为避免软基上悬索桥锚碇的散索鞍在大缆拉力下发生过大位移而危及桥梁结构,提出了锚碇沉井隔仓的后填芯法,利用填芯体重量产生的反向力矩抵消大缆拉力产生的力矩,实现散索鞍位移补偿和控制。在分析散索鞍位移对主塔鞍座水平位移影响的基础上,基于最优化原理给出了填芯量的确定方法,分析了后填芯过程中锚碇基础稳定安全系数的变化,指出后填芯法施工不会降低锚碇稳定性。最后,探讨了后填芯法的施工工艺,并结合某大桥锚碇进行了实例计算。Large displacement can occur in the cable saddle of the anchorage of suspension bridge built on the soft foundation under large pulling force,which can endanger the bridge structure.In order to prevent this,apost filling method with the anchorage of open caisson was proposed.The reverse torque caused by the weight of filling body can balance out the torque produced by the large pulling force,which can compensate and control the displacement in the anchorage.Based on the analysis of the impacts of displacement in the anchorage on horizontal displacement of main tower saddle,the determination method of filling quantity was proposed using the optimization principle.The variation of safety coefficient of anchorage foundation during the post filling process was investigated,which suggested that the construction using post filling method would not decrease the stability of anchorage.Finally,the construction technique of post filling was discussed and an example was introduced for an anchorage of bridge with the post filling method.

关 键 词：沉井 锚碇 散索鞍 位移 后填芯法 

分 类 号：TV139.1[水利工程—水力学及河流动力学]