6
施工技术
CONSTRUCTIONTECHNOLOGY
2012年9月上第41卷第372期
襄樊汉江三桥现浇连续梁鹰架设计与施工
吴刚，刘开扬
（中建三局股份公司工程总承包公司，湖北武汉430064）
【摘要]以裹樊汉江三桥变宽段现瓷连续箱梁施工为依托，针对实际地质情况，详细介绍了唐架法在现瓷箱梁支架施工中的应用，以常用的贝雷片作为主要承重构件，对基础、临时墩、贝雷等的设计与施工进行了深人总结。所施工的箱梁线形符合设计要求，混凝土外观表面平整。通过对支架的卸载体系进行技术创新，即对底模和翼缘板
下的支架采用不同的卸载方法，进而可以使翼缘板模板及支撑架顺利地整体滑移，大大提高了模板的周转效率。【关键词】桥梁工程；斜拉桥；模板；膚架；施工技术
【中图分类号】TU744;U448.27
【文献标识码］A
[文章编号】1002-8498(2012)17-0006-05
DesignandConstructionoftheCorbellingforCastingofContinuous
GirdersintheThirdXiangfanHanjiangRiverBridge
Wu Gang,LiuKaiyang
(General Construction Company of CCTEB,Wuhan，Hubei430064，China)
Abstract : The application of corbelling method in construction of cast-in-place continuous box girders was introduced in this paper, with the Third Xiangfan Hanjiang River Bridge as an demonstrating example. Considering the actual geological conditions, common bailey support was used as the main bearing member. The design and construction method for foundations,temporary piers and bailey girders were summarized. After the construction, the outline of the box girders was checked to meet the design requirements and the concrete surfaces are smooth. Technological innovations were introduced for the support unloading system by using different unloading methods for bottom formwork and support under the flange. In this way, the flange formwork and the support can slip together,and the turnover rate of the formwork can be increased.
Key words:bridges; cable stayed bridges; formwork; corbelling; construction
1工程概况
襄樊市内环线汉江三桥工程滩桥连续箱梁为双向预应力混凝土结构，纵向按全预应力体系控制，箱梁为C50混凝土，采用双幅分离式预应力混凝土等高连续箱梁，中间设2cm的间隙。桥址位于襄樊汉江月亮湾公园一老龙洲河滩上，河滩上覆中密粉砂层，厚6~15m，往下为密实卵石层。
滩桥中变宽段箱梁为5×50m（联）的单箱双室截面，顶宽15.74~20.87m，底宽6.74~11.87m，墩顶横隔梁前后690cm范围腹板厚度由50cm变至 120cm，底板由25cm变至75cm，两侧翼缘宽均为 3.5m，梁高2.8m，箱梁均为顶、底板斜置，坡度同桥面坡度（2%），腹板斜做，如图1所示。单跨箱梁混
【收稿日期】2012-04-12
[作者简介】吴刚，工程师，E-mil：wg99990@163.com 万方数据
凝土最大用量约730m，箱梁均采用支架现浇施工。
1574~2.087
宽
50
图1箱渠跨中断面（单位：cm）
Fig.1Mid-span section of box girder(unit:cm)
2支架设计 2.1支架构造
支架采用630mm×8mm钢管作立柱，贝雷梁作承重主梁，夯扩灌注桩基础。2排共10根钢管柱组成1道临时墩，每道临时墩宽3m，每孔箱梁设2 道临时墩，临时墩上设22排贝雷梁，贝雷梁跨径为（12+3+15+3+12）m，贝雷片规格为170cm× 300cm（带上、下加强弦杆，另有部分非标准节桁