悬臂浇筑法中劲性骨架段的合理长度
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摘要
悬臂浇筑与劲性骨架组合施工法是一种新型的钢筋混凝土拱桥施工方法,相较于悬臂浇筑施工,不仅可以缩短拱圈悬臂浇筑段的长度,减轻悬臂的质量,降低对扣锚系统的要求,而且能够尽快形成拱结构,从而减少施工风险,缩短工期,提高钢筋混凝土拱桥的经济性。从主拱圈自身受力特点、扣索力的利用效率、施工过程最大扣索力、拱圈拉应力等几个方面分析了悬臂浇筑与劲性骨架组合法中劲性骨架段合理长度的选取。结果表明劲性骨架段长度取跨度的0. 38～0. 54倍最为合理。
The combined construction method of cantilever casting and stiff skeleton is a new construction method of reinforced concrete arch bridge. Compared with cantilever casting construction,it can not only shorten the length of cantilever casting segment of arch ring,lighten the weight of cantilever casting segment,and reduce the requirement of anchoring system,but also can form arch structure as soon as possible,thus reduce construction risk,shorten the project time,and improve the economic benef it of reinforced concrete arch bridge.The selection of the reasonable length of the stiff skeleton segment of the combined method of cantilever casting and stiff skeleton was analyzed comprehensively from the stress characteristics of arch ring,he utilization efficiency of cable force,the maximum cable tension and tensile stress of arch ring in the construction process.The results show that the most reasonable length of the stiff skeleton segment is0. 38 ～ 0. 54 times of the span.
The combined construction method of cantilever casting and stiff skeleton is a new construction method of reinforced concrete arch bridge. Compared with cantilever casting construction,it can not only shorten the length of cantilever casting segment of arch ring,lighten the weight of cantilever casting segment,and reduce the requirement of anchoring system,but also can form arch structure as soon as possible,thus reduce construction risk,shorten the project time,and improve the economic benef it of reinforced concrete arch bridge.The selection of the reasonable length of the stiff skeleton segment of the combined method of cantilever casting and stiff skeleton was analyzed comprehensively from the stress characteristics of arch ring,he utilization efficiency of cable force,the maximum cable tension and tensile stress of arch ring in the construction process.The results show that the most reasonable length of the stiff skeleton segment is0. 38 ～ 0. 54 times of the span.
引文
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[2]吕建根,张辉.大跨度拱桥无支架扣挂系统设计与拱肋安装[J].铁道建筑,2009,49(6):22-24.
[3]陈宝春.超大跨径混凝土拱桥的研究进展[C]//全国桥梁学术会议论文集.重庆:中国土木工程学会,2006:205-211.
[4]杨昌龙.采用悬臂浇筑与劲性骨架法施工的大跨径混凝土拱桥施工稳定性研究[D].重庆:重庆交通大学,2014.
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[6]陈啟婵.夜郎湖大桥主拱构造及其力学行为研究[D].重庆:重庆交通大学,2015.
[7]钟琼.涪陵乌江大桥复线桥设计与研究[J].公路,2017(5):121-125.
[8]邓晓红,陈冠桦,万麟.夜郎湖特大桥设计与施工[J].中外公路,2016(5):120-124.
[9]成文,王学敏,成武,等.劲性骨架长度对主拱刚度的影响[J].铁道建筑,2018,58(11):43-45.
[10]刘建军..大跨径悬浇拱桥设计与施工[J].交通科技,2012(5):1-3.
[11]闫业祥,钱永久,谢效瑞.梁板单元模型在劲性骨架钢筋混凝土拱桥仿真分析中的合理性研究[J].铁道建筑,2018,58(2):23-27.