连接构造对混凝土管节接头受力特性影响研究

Research on the influence of connection structure on the mechanical characteristics of concrete pipe joints

随着顶管施工技术迅猛发展,顶管法施工已广泛应用于长距离、大断面以及各种复杂地质条件下的管道建设,对顶管的结构安全提出了新的挑战。顶管接头由于特殊的连接构造而成为顶管结构中相对薄弱的一环,故对管节接头受力特性的研究就十分必要而且具有重要意义。为改善顶管接头及管节的受力状况,基于重庆市观景口水利枢纽2号无压隧洞实际管节接头结构建立了数值分析模型,获得了衬垫、套环的厚度及材料的泊松比、弹性模量等物理参数对混凝土顶管接头受力特性的影响规律,并为顶管接头设计中衬垫和套环的材料选择和尺寸设置提出了参考建议。

With the rapid development of pipe jacking construction technology,pipe jacking method has been widely used in pipeline construction under long distance,large section and various complicated geological conditions,which presents new challenges to the structure safety of pipe jacking.Pipe jacking joint is a relatively weak link in pipe jacking structure because of its special connection structure,so it is very necessary and significant to study the mechanical characteristics of pipe joint.To improve the stress of the pipe fittings and pipe joint,based on the actual socket joint structure of#2 non-pressure tunnel of the Guanjingkou Multi-purpose Project in Chongqing City,numerical analysis model is established,and obtained the thickness of the liner,thimble and material physical parameters such as Poisson’s ratio and elastic modulus of concrete pipe jacking joint the influence law of mechanical characteristics,and for the top liner in the design of pipe joint and lantern ring material selection and size set reference suggestions are put forward.