多滑道滑移施工的跨中临时支撑优化设计方法  

Optimal Design Method of Temporary Support in Mid-span About Multi Slide-way Sliding Construction

作　　者：高丁丁[1] 郭猛[2] 徐仲卿[1] 袁泉[1] 高未未 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国建筑科学研究院,北京100013

出　　处：《施工技术》2016年第8期117-122,共6页Construction Technology

基　　金：国家自然科学基金资助项目(51308522)

摘　　要：针对大跨钢结构跨中设置临时支撑的多滑道滑移施工技术,探讨优化跨中临时支撑设计、降低滑移施工造价的可行性。在已有跨中临时支撑简化悬臂杆模式的基础上,从改变计算长度入手,提出3种优化设计方法,也即3种跨中临时支撑等效模式:支撑顶部等效铰接模式、两端等效铰接模式、T形支撑模式,通过改变临时支撑体系与顶部主桁架结构、下部基础的连接状态来改变临时支撑体系上下端的约束条件,降低支撑结构整体计算长度,使之更有利于结构自身的稳定性。本文提出的临时支撑优化设计方法,对于承载力由稳定性起控制作用的临时支撑结构可以减少结构用钢量,降低滑移施工成本;对于其他因素控制设计的临时支撑结构,亦可以提高其整体稳定性及滑移施工的安全性。For multi slide-way sliding construction technology of large-span steel structure that was set temporary support in mid-span,we probe that whether the optimal design method of temporary support reducing sliding construction cost is feasible. On the basis of temporary support simplified to a cantilever bar mode,the paper presented three patterns including the pattern of equivalent hinge joint at top of support,the pattern of equivalent hinge joint at both ends of support and the pattern of T-type support by changing the length of calculation. The patterns named optimal design method are aim to change the upper and lower constraints of the temporary supporting system by changing the state between the supporting system and the main truss and the state of the foundation,reducing supporting structures overall calculated length,making the stability of the structure more favoring. Thus for the structure that bearing is controlled by stability,the optimal design method proposed in this paper can reduce the structure of the steel consumption and reduce material costs,and however for the structure that bearing is not controlled by stability, they can improve structural overall stability greatly and make sliding construction more safety.

关 键 词：钢结构 滑移 施工技术 支撑体系 稳定性 

分 类 号：TU398.2[建筑科学—结构工程]