摘要
圆形沉井和矩形沉井是给排水工程中最为常见的两种沉井,与桥梁工程中的沉井相比,给排水沉井有其独到的结构特点。结合ANSYS软件计算结果及现场实测数据,分析了这两种类型沉井在初始下沉工况和下沉到位工况的受力状况。结果表明,自重荷载和局部支撑面积是控制侧壁竖向弯曲的重要因素,竖向刚度的突变导致井壁出现"缩颈"现象,在"缩颈"部位产生应力集中。合理地选择施工工艺,以及加强下沉阶段的施工控制措施可有效改善沉井结构在下沉阶段的受力状况,凸显沉井在受力性能和经济方面的优势。
Circular and rectangular caissons are the most common forms in water supply and sewerage engi-neering.Compared with the deep-water foundations of major bridge,the drainage open caisson has its unique characteristics.Combined the calculated results of ANSYS with the field data,such two types of open caisson sinking in the initial stage and the design position are analyzed in this paper.The results show that gravity load and the area of local support are important factors to control vertical bending stress.Because of the stiffness varying in vertical direction,sidewall appears a necking down phenomenon.It will lead to stress concentration when the caisson sinking to design position.Based on the results,a reasonable construction technology and proper control measures could effectively improve the stress conditions of the caisson structure.With a series of practical guidelines,the open caisson would have a great advantage in mechanical behavior,economically and technically.
出处
《结构工程师》
北大核心
2014年第4期155-161,共7页
Structural Engineers
关键词
给排水沉井
结构分析
施工控制
现场监测
open caisson of sewerage engineering
structure analysis
construction control
field monitoring
