地下埋藏式压力钢管无内支撑安装变形分析  

Deformation Analysis of Underground Embedded Penstock without Inner Support during Installation Period

作　　者：汪剑国 伍鹤皋[1] 石长征[1] 彭鹏 彭智祥 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]成都阿朗科技有限责任公司,四川成都611130

出　　处：《水力发电》2016年第12期50-55,共6页Water Power

基　　金：国家自然科学基金资助项目(51409194)

摘　　要：以某水电站超大型地下埋藏式压力钢管为研究对象,分别考虑钢管两侧混凝土同时水平上升和存在高差浇筑两种情况,对钢管在混凝土浇筑阶段的受力变形进行有限元数值分析。计算结果表明,两种浇筑方式下内外支撑的布置对钢管变形规律影响不大,最大变形出现在钢管底部,数值上均满足规范对钢管变形的控制要求;内支撑和拉杆的轴向应力较小,在减小钢管变形上的作用不大。因此,建议取消内支撑而保留拉杆作为防止钢管产生移位的固定措施,以顺利实施钢管自动化焊接、安装和混凝土浇筑,提高施工效率,节省工程投资。The finite element numerical analysis is adopted to calculate the stress and deformation of large underground embcddcd penstock of a hydropower station under the stage of concrctc pouring, in which, two pouring schemes of concrete horizontal rising and concrete rising with height difference in both sides arc considered. The calculation results find that, （a） the layout of inner and external supports has little effect on thc deformation law of penstock under two pouring schemes, the position of maximum deformation locates at the bottom, and the value of which is satisfied within the control of specifications; and （b） the fact of small axial stress of inner support and external pull rod shows these supporting measures just play a small function in rcducing the deformation of penstock. So it is suggested that the inner support can be canceled and the pull rod can be preserved as a fixed measure to prevent shift of penstock, in this case the automatic welding, installation and concrete pouring can be implied successfully to improve construction efficiency and save investment.

关 键 词：地下埋藏式压力钢管 混凝土浇筑 自动化焊接 内支撑 变形分析 

分 类 号：TV314[水利工程—水工结构工程]