千斤顶贝雷反力梁在牵索挂篮预压中的应用  

Application of Jacks and Reaction Bailey Trusses to Preloading of Guyed Traveling Carriages

作　　者：冯浩 钟启凯 刘中涛 刘开扬 

机构地区：[1]中建三局股份公司工程总承包公司,湖北武汉430064

出　　处：《桥梁建设》2012年第A01期121-125,共5页Bridge Construction

摘　　要：襄阳汉江三桥主桥为(128.5+310+128.5)m双塔双索面预应力混凝土半飘浮体系斜拉桥,主梁的94个节段采用牵索挂篮施工,挂篮采用千斤顶贝雷反力梁预压。模拟3号节段(最重的)重量的1.1倍进行预压,2组贝雷梁组成的反力梁利用精轧螺纹钢分别锚固在2号、2′号节段两侧边箱上,与反力梁对应的位置设置型钢千斤顶基座,根据预压梁段的重量进行等效计算后布置千斤顶,节段箱梁中间顶板荷载通过在挂篮底篮相应位置堆放砂袋或钢筋及钢绞线模拟加载。为确保预压安全、合理,采用有限元法模拟预压,得出关键构件内力、变形均满足要求。29号主墩江侧挂篮预压结果表明:各构件的实测位移曲线比较均匀,与理论分析计算结果吻合较好,并与后续梁段施工的结果十分接近。The main bridge of the Third Xiangyang Hanjiang River Bridge is a prestressed concrete semi-floating system cable-stayed bridge with double pylons,double cable planes and with span arrangement（128.5＋310＋128.5） m.The 94 segments of the main girder of the bridge were constructed by the guyed traveling carriages and the traveling carriages were preloaded by the jacks and reaction Bailey trusses.The preloading was carried out by simulating 1.1 times of the weight of the segment No.3（the heaviest segment）.The reaction trusses formed by the two groups of the Bailey trusses were respectively anchored by the fine-rolled threaded bars to the side boxes on both sides of the segments No.2 and No.2′.At the locations corresponding to the reaction trusses,the sectional steel bases for the jacks were set.On the basis of the equivalent calculation according to the weight of the preloaded segments,the jacks were installed.For the middle top slabs of the segmental box girder,the slabs were loaded by simulating the heaped sand bags or reinforcement and steel wire strands at the corresponding locations of the traveling carriages.To ensure the preloading would be safe and rational,the finite element simulation method was used and the internal forces and deformation of the critical members would be obtained.The results of the preloading the traveling carriage of main pier No.29 of the bridge on the river side showed that the measured displacement curves of various members were uniform,were agreeable with the theoretic analysis and calculation and were very close to the results of the construction of the successive segments.

关 键 词：斜拉桥 牵索挂篮 贝雷反力梁 预压 桥梁施工 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.46[交通运输工程—道路与铁道工程]