82
D01:10.7672/sgjs2015050082
施工技术
CONSTRUCTIONTECHNOLOGY
快速可展式预应力钢桥施工技术研究
夏志远，董军？
南京210009；2.南京工业大学新型钢结构研究所，江
（1.南京工业大学土木工程学院，江苏
2015年3月上第44卷
第5期
南京211816）
【摘要】为保障灾后教援道路通畅，提升灾后教援能力，开发可快速成桥的新型应急桥梁成为目前军事与民用急需。快速可展式预应力钢桥以剪叉式单元为可展基本单元，可实现快速展开成型并投人使用。利用MIDAS/Civil 对24m跨快速可展式预应力钢桥施工技术进行研究，分析了吊点位置、桥面板铺装过程及拉索张拉过程中结构的性能，提出并优化各阶段施工方案。结果表明，吊点距岸边6m较优；桥面板铺装采用先对称后依次铺装的方法实现的可能性最大；预应力施加过程需分级、分步，采用上80%一下80%一下100%一上100%的方案，索力变化最为平缓。
【关键调】桥桑工程；钢桥；吊点；桥面板；铺装；张拉次序；施工技术
【中图分类号】U448
【文献标识码】A
[文章编号】1002-8498(2015)05-0082-05
StudyontheConstructionTechnologyofRapidlyDeployable
PrestressedSteelBridge Xia Zhiyuan', Dong Jun
(1. College of Cisil Engineering,Nanjing Unitersity of Technology, Nanjing,Jiengsu210009, China; 2. Institute of Steel Structures,Nanjing Unisersity of Technology, Nanjing,Jiangsu211816, Chine)
Abstract: To ensure the unimpeded flow, of the transportation after disasters and improve the ability of solving logistical problems associated with disaster-relief operations, the design and development of new emergency bridges with rapid constructions meet the requirement of military and civil engineering. The basic deployable element of the rapidly deployable prestressed steel bridge ( RDPSB) is a scissor-fork unit, so it can be constructed quickly from the folding state to the expanded state. With finite element software MIDAS/Civil, the construction technology of a 24m-span RDPSB is analyzed, including the position of lifting point and the sequence of deck pavements and the initial tension. The projects of main construction periods are proposed and optimized. The results show that the best lifting point is 6m away from the left shore. In the process of deck pavements, workers should pave the decks of the first span and the last span firstly, then pave the decks from left to right one by one. The best sequence of initial tension is that, firstly, the value of the top string rises to 80% of the designed value, secondly, do the same procedure to the bottom string, thirdly, the value of the top string rises to 100% of the designed value, fourthly, the value of the bottom string rises to 100% of the designed value.
hoisting
Keywords:bridges; steel bridges;
points;bridgedeck；pavements;
tension
sequence; construction
.
引言
自然灾害会导致大面积道路摊痪及桥梁损坏，
为保证救援道路通畅，提升灾害救援能力，开发可通过快速施工成桥的新型应急桥梁成为目前军事与民用急需！1-]。现有装配式桥梁构件分散化程度
【作者简介】夏志选，硕士，E-mail：zhiyuanxiaqq.com
【收稿日期】2014-03-07 万方数据
高，现场组装时构件数量多、节点连接繁琐，施工速度仍受到制约(3)。针对这一不足，国内外学者提出了一种新型可快速施工桥梁，即可展桥[6-9]。
代表性的可展桥有美国威斯康星大学Joseph PatrickHanus面向美国军方研究设计的纤维加强混凝土桥面板可展桥()，浙江大学关富玲及其团队研制的以剪式铰和套筒可展机构实现轴向展开的新型可展军用桥*)，日本广岛大学有尾一郎设计的也