2011年4月下第40卷
第339期
施工技术
CONSTRUCTIONTECHNOLOGY
独塔单索面部分斜拉桥非对称施工技术
孙小猛”，闫子才"，朱大勇”，陈辉3
（1.中铁西局集团博士后工作站，安蒙合肥230023；2.合肥工业大学土木与水利工程学院，安徽合肥
230009;
3.中铁四局集团第二工程公司，江苏苏州215131）
【摘要】依托余姚中山路斜拉桥项目，针对独塔单索面部分斜拉桥的结构特点，并结合该桥的周围环境，主桥主策采用支架现尧和悬肾浇筑结合的非对称施工方法。根据悬肾现尧对称性施工原则和力学原理，建立不利条件下一侧挂篮一侧支架法现浇施工的新工艺，在支架侧先行施工一个节段，为菱形挂蓝提供配重，经过体内预应力和体外
斜拉索张拉，可有效保证结构安全。另外介绍了独塔单索面部分斜孔桥非对称施工技术的施工要点。【关键词】单索面；独塔；部分斜拉桥；非对称施工
【中图分类号】U448.27
【文献标识码】A
[文章编号】1002-8498(2011)08-0083-03
AsymmetricConstructionTechnologyofPartialCable-stayedBridge
withSinglePylonandSingleCablePlane Sun Xiaomeng',Yan Zicai',ZhuDayong',Chen Hui
(1. Postdoctor of China Tiesijiu Civil Engineering Group Co.,Lad., Hefei, Anhui230023, China; 2. School of Civil Engineering, Hefei Unitersity of Technology, Hefei, Anhui230009, Ching; 3.The Second Construction Co.,Lad. of CTCE Group,Suzhou, Jiangsu215131, China)
Abstract: According to the structural characteristics and the surrounding environment of partially cable-stayed bridge in Yuyao Zhongshan Cable-stayed Bridge, the asymmetric construction method which is combined with supporting cast-in-place and cantilever casting is applied. Based on the asymmetric construction principal and mechanical theory,a new pouring construction process of one side hanging basket and the other side supporting is established at the bad conditions. At the supporting side, a segment of the arch rib is set up firstly as the gravity of hanging basket. Through the tension of intermal prestressed and extemal stayed-cable,the structure safety is guaranteed effectively. The key points about asymmetric construction technology of cable-stayed bridge are described in detail.
Key words: single cable plane; single pylon; partial cable-stayed bridge; asymmetric construction
1
工程概况
余姚中山路(万年桥路一纬十路)工程主桥，南
侧跨越南兰江路，北侧跨越最良江。南兰江路为城
市主干道，道路净宽10.5m；最良江为通航河流，宽 55m，主桥长152m，采用独塔单索面预应力混凝土部分斜拉桥（76m+76m）。主桥主塔高62m，斜拉索共9对。主桥两侧梁体不对称，南侧桥面宽 26.5m，北侧桥面宽35.0m。主桥立面如图1所示，主桥跨路侧和跨江侧主梁断面分别如图2，3所示。
考虑到主桥一侧跨江，一侧跨路，两侧均处于通航或通行状态，跨江侧宜采用悬臂浇筑施工。另外，【收稿日期】2011-01-04
【作者简介】孙小猛，中铁四局集团博士后工作站博士后，工程师，江苏省苏州市相城区蓝塘河路9号
215131电话：15862544159，
E-mail;sxm_98@163.com 万方数据
11+8×6+17
南兰【江路
83
6+11=76
最良江通航孔B-55.H-7
76
图1主桥立面（单位：m）
Fig.1Main bridge elevation(unit:m)
本桥为独塔单索面部分斜拉桥，桥面较宽（分别为 26.5m和35m），若采用前支点挂篮悬浇施工不容易