2013年6月上第42卷
第11期
DOI;10.7672/sgjs2013110073
施工技术
CONSTRUCTION TECHNOLOGY
桃花峪黄河大桥钢箱梁顶推摩擦副试验研究
王同民
（中铁大桥局第一工程有限公司，河肃
郑州450053）
【摘要】常规滑振式摩撤副摩接系数大，影响因索多。为了解决大跨自锚式悬索桥重型钢箱梁在高位单向多点长距离项推条件下架设难题，应用摩擦学原理，通过力学性能试验，筛选MCE板。设计了能模拟实际工作状态的摩擦副试验装置，通过大量试验和数据采集分析，掌握了摩擦系数变化基本规律，研制出低摩阻的摩擦副结构，将最大工作摩擦系数降低至0.06以内。
【关键调】桥梁工程；悬索桥；钢箱；顶推；摩擦副；试验
【中图分类号】U445.4
【文献标识码】A
[文章编号】1002-8498(2013)11-0073-04
Experimental Studyon IncrementalLaunchingFrictionPairforthe
Steel Box Girder of Taohuayu Yellow River Bridge
Wang Tongmin
(The First Engineering Co. , Lad. , China Railway Major Bridge Engineering Group,Zhengzhou,He'nan450053,China) Abstract: Taohuayu Yellow River Bridge is a self-anchored suspension bridge with the largest span in the world. The steel box girder of the bridge was constructed using the incremental launching method. Conventional friction pairs have high friction coefficients and their friction coefficients are affected by a number of factors. To solve the difficulty of incremental launching for the large span steel box girder at high altitude and with long launching distance, MGE plate was selected from mechanical property test and a test device was designed to simulate the actual working state of the friction pair. With extensive test and data analysis, the basic principles of friction coefficient variation was obtained and a friction pair with low friction coefficient was developed, which was able to reduce the friction coefficient to be within 0. 06. Key words:bridges; suspension bridges; steel box girders; incremental launching; friction pairs; testing
1工程概况
武西高速公路桃花峪黄河大桥主桥为（160+
406+160)m双塔3跨自锚式悬索桥（见图1），为目前同类型桥梁跨度之最。其加劲梁高3.5m、宽 39m，总重19000t，采用大跨高位单向多点同步顶推技术施工。
由于桥位处于黄河中下游分界点，其顶推施工有其特殊性：①临时嫩基础地质条件差
位于黄河
主河槽以粉细砂为主含粉质黏土夹层的沉积层，地基承载力差；②临时墩跨度大受防洪度汛、黄河调水调砂期间行洪及黄河测量船通行要求，临时墩
·中铁大桥局桥经[2011]244号：武西高速公路桃花略黄河大桥关键技术研究
【作者简介】王同民，副总工程师，高级工程师，E-mail：ztmbec@vip qq.com
【收稿日期】2013-01-09 万方数据
sot
h 国国通
10.300游进与摩擦酬18400
图1钢箱渠横断面示意
OEO1
Fig.1Cross section of steel box girder
最大跨度达82m；③顶推位置高
73
钢箱梁顶推滑动
面距河床面56~60m，墩顶水平力对临时墩稳定影响大；④深冲刷主河槽游荡性强，且局部冲刷总深达26.23m，对项推阶段临时墩威胁大；③大吨位钢箱梁总重达19000t，加之临时墩跨度大，单墩墩顶反力达24200kN；③顶推距离长跨度达同类型桥梁之最，且受地形所限，只能由北向南单向顶推，顶推距离长；②时间跨度大
钢箱梁顶推时间