摘要
移动模架主要用于中小跨度桥梁施工,对国内外的研究进展及工程案例进行分析比较,重点介绍国外有机预应力技术的研究和应用情况。该技术利用生物学中的肌肉控制原理及自动化控制领域的研究成果对体外预应力技术进行改进和完善,使其能够在传感器和控制设备的帮助下,根据荷载变化自动调整缆索应力水平及伸长量,因而能够减少移动模架结构变形并使预拉力最小化。为充分发挥有机预应力的优势,国外企业在移动模架设计中采用了新的结构形式、轻型化的专用设备及木质模板系统,这些措施的综合运用使移动模架的经济跨度增大到70~90m,并在工程实践中取得良好效果。
Movable Formwork is mainly used for the construction of medium and small span bridges. The status quo of the study and engineering examples of the organic prestressing tech- nique at home and abroad are analyzed and compared, with the focus on introducing the relevant research and application condition abroad. The technique is the one that draws upon the muscle control theory in biology and the research achievements in automatic control domain to upgrade and improve the external prestressing technique. With the aid of sensors and control devices, the stress level and elongation amount of prestressing tendons can be automatically adjusted according to the load variation; therefore, it can reduce the structural deformation of the movable formwork and minimize the pre-tensioning force. To make the most of the advantages of organic prestress- ing, some foreign enterprises have added new structural forms, light specialist devices and timber formwork system in the movable formwork design. The integrated application of these measures makes the economic span length accruing to 70~90 m, and obtain sound application effect in actual projects.
出处
《世界桥梁》
北大核心
2015年第3期54-58,74,共6页
World Bridges
关键词
桥梁
大跨度移动模架
有机预应力
设计
施工
bridge
long-span movable formwork
organic prestressing
design
construction
