大步距钢索式自平衡步履顶推技术研究

Research of Large step steel cable type self balancing walking pushing technology

现有步履设备结构中,无论是分体式还是集成式,都需要频繁起落梁的步骤,当桥梁线形复杂时,频繁起落将增加调整次数,且存在顶推速度慢、步距短、顶推重量小等缺点。为适应大跨桥梁顶推施工的难度,将步履式与拖拉式设备的功能相互融合,即在常规步履设备的基础上,提速(解决蛙跳问题并提高顶推速度)、增效(长步距提高施工工效)、降低安全风险(减少起落梁次数),形成钢索式自平衡步履顶推技术,从而大幅提高施工效率。以柳州市凤凰岭大桥主梁顶推施工技术为例,对大步距钢索式自平衡步履顶推设备进行研究;阐述了钢箱梁“130m国内第一顶推跨度”“单墩重载”“双幅同步高精度顶推”“复杂竖曲线组合线型”等特点。

In the existing walking equipment structure,whether it is a split type or an integrated type,frequent lifting and lowering of the beam is still required.When the bridge shape is complex,frequent lifting and lowering will increase the number of adjustments,and there are also disadvantages such as slow pushing speed,short step distance,and small pushing weight.In order to adapt to the difficulty of large-span bridge pushing construction,the functions of walking and dragging equipment are integrated,that is,on the basis of conventional walking equipment,to increase speed(solve frog jumping problems and increase pushing speed),increase efficiency(improve construction efficiency with long steps),and reduce safety risks(reduce the number of lifting and lowering beams),forming a steel cable self balancing walking pushing technology,thereby greatly improving construction efficiency.The article takes the construction technology of the main beam of Fenghuangling Bridge in Liuzhou City as an example,mainly elaborating on the research of the large step steel cable self balancing walking pushing equipment to meet the characteristics of steel box beams such as"the first pushing span in China of 130m","single pier heavy load","double amplitude synchronous high-precision pushing",and"complex vertical curve combination line".