摘要
研究目的:为了加快施工进度、降低造价,同时也为了减少站房改造对社会的影响、体现绿色环保、保持老站房历史建筑风貌,有时需要在不拆除既有站房屋盖的前提下,对其下部结构进行局部改造和加固。本文根据钢网架屋面结构自重较轻的特点,以重庆江北龙头寺站既有站房改造为例,对用柔性吊索对既有站房屋盖进行支托,进而对下部结构进行改造的柔性吊索支托法进行研究。研究结论:(1)柔性吊索支托法,充分利用了钢网架屋面较轻的特点,对支撑网架支座的弧形梁采用主动加载的方式控制与调整屋面钢网架支座位移,辅以量测监控手段和反馈设计,能更有效的控制网架构件内力,避免了屋面钢网架结构的拆除与重建,可节约4个月工期和550万元造价;(2)更加符合绿色环保的理念,与传统临时立柱支托法相比,可节约645万元;(3)当需要保存老站房历史建筑风貌、或考虑到社会影响等其他原因而无法采用拆除站房屋面钢网架结构时,采用柔性吊索支托法可以实现在保留屋面钢网架结构的前提下对下部结构进行改造加固。
Research purposes： In order to speed up the construction process, cut the construction cost, reduce the influence of remodeling the building on the social environment, reflect green environment protection and remain the style and features of the old building, sometimes it is necessary to remodel and reinforcing some parts of the substructure of the existing station building without demolishing the roof cover of the building. The research was done on the remodeling the substructure of the Chongqing North Railway Station with the support method of the flexible stayed cable according to the feature of the relatively light weight of the spatial frame roof of the building. Research conclusions： （ 1 ） According to the light feature of the steel frame roof, by using the flexible tensile cable method, the active loading was conducted to the arc beam of the support base of the steel frame for controlling and adjusting the displacement of steel frame base of the roof and with the monitoring means and feedback design, it could control the internal force of the frame member effectively and avoid the demolishing and reconstruction works for the steel frame structure of the roof. In this way, the construction time of four months and the construction cost of 5.5 million Yuan could be saved. （2） Compared with traditional column support method, the 6.45 million Yuan could be saved by using this method,with more concept of the green environment protection. （3） When needing to remain the historical style and features of the old building or consider the social influence, but it had no way to demolish the steel frame structure of the roof, the flexible tensile cable method could be used the frame on the premise of remaining the frame structure of the roof.
出处
《铁道工程学报》
EI
北大核心
2012年第10期84-89,共6页
Journal of Railway Engineering Society
关键词
结构改造
柔性吊索
预应力张拉
托换施工
钢网架屋面
structure remodeling
flexible stayed cable
pre- stress roof for remoulding and reinforcing the substructure of tension
underpinning construction
spatial frame
