摘要
深中通道伶仃洋大桥为主跨1666m的三跨海中钢箱梁悬索桥,其东泄洪区非通航孔桥长2640m,结构形式为4联6跨110m钢箱梁,均采用独墩大悬臂盖梁结构,单侧最大悬臂长度13.2m,最大浇筑荷载534t。原方案采用落地钢管桩支架,由于受到盖梁高度和地质条件的制约,导致其存在入土深度大、设备要求高及周转效率低的问题,因此最终采用托架法进行盖梁施工,采用Midas/Civil分别建立了优化前后的支架模型,从结构受力、周转效率、支架安拆等方面进行对比分析。结果表明,优化后方案结构安全可靠、配合安拆工装周转效率极高、共节省钢材1191t,同时减少了约500万元的设备投入。
The Lingdingyang Bridge is a three-span steel box girder suspension structure with the main span of 1666 m.The length of the non-navigation span bridge in the east flood discharge area is 2640 m,and the structural form is 4 modular 6-spans of 110 msteel box girders.The single pier bent cap structure with large cantilever is adopted.The maximum cantilever length of single side is 13.2 m,and the maximum pouring load is 534 t.The original scheme adopts the landing steel pipe pile support.Due to the restriction of the bent cap height and geological conditions,it leads to the problems of large depth of soil,high requirements for equipment and low turnover efficiency.Therefore,the bracket method is used to cover the beam construction.Midas/Civil is used to establish the support model before and after optimization,and the structure stress,turnover efficiency,assembly and demolition of support are compared and analyzed.The results show that the structure of the optimized scheme is safe and reliable,and the turnover efficiency of the installation and demolition tooling is quite high,with a total saving of1191 tsteel and reduced equipment investment by about 5 million.
作者
李冕
廖林冲
LI Mian;LIAO Lin-chong(Key Laboratory of Large-span Bridge Construction Technology,Wuhan 430014,China;CCCC Second Harbor Engineering Company Ltd.,Wuhan 430014,China)
出处
《公路》
北大核心
2021年第11期138-143,共6页
Highway
关键词
海中盖梁
托架法
落地支架
安拆工装
有限元分析
mid-sea bent cap
bracket method
landing bracket
assembly and demolition tooling
finite element analysis
