预制装配地铁车站支吊架竖向连接双向容错支座设计

Design of Vertical Bi-Directional Position Error Tolerant Support of Prefabricated Metro Station Supports and Hangers

预制装配式结构可提高施工效率以及结构抗震与耐久性能。目前,国内地铁车站中开始使用预制装配结构。支吊架的预埋套筒连接可避免后锚固易损伤混凝土、锚固质量不易控制等问题,其容错设计是该技术应用的关键。为此,首先提出了一种与预埋套筒及下部竖向支吊架构件连接的双向容错支座的结构形式,该支座包括与预埋套筒连接的n形板及与下部竖向构件连接的顶座,通过在n形板顶板分别设置两个方向长孔实现双向容错;其次,提出了该支座的有限元建模方法,分析了设计荷载下支座的应力分布及变形性能,研究了该支座的安全储备及套筒预埋误差对其变形性能影响;最后,通过试验分别研究了支座三个方向的承载能力和变形性能。研究表明,提出的预制装配地铁车站支吊架竖向连接双向容错支座满足其设计荷载下的应力及变形需求,且具有较好的安全储备。

The pre-fabricated structure can improve construction efficiency and structural seismic and durability performance.At present,pre-fabricated structures have been used in domestic metro stations.The pre-embedded sleeve connection of the support and hanger can avoid problems caused by post anchoring such as damage to concrete and difficult control of anchoring quality,and its position error tolerant design is the key to the application of this technology.Therefore,this paper first proposed a structural form of bi-directional position error tolerant support connecting the pre-embedded sleeve and the lower vertical support hanger member.The support consists of a n-shaped plate connected with the pre-embedded sleeve and a top seat connected with the lower vertical member.Bi-directional position error tolerance can be achieved by setting long bolt holes in two directions in the support;Secondly,the finite element model with the given support mechanical parameter is established to analyze the stress distribution and deformation performance of the bearing under the design load,and the safety reserve of the support and the influence of the pre-embedded error of the sleeve on its deformation performance is studied;Finally,the bearing capacity and deformation performance of the support in three directions are studied through experiments,and the results show that the vertical connection bi-directional position error tolerant support of the pre-fabricated metro station supportsand hangers proposed in this paper can meet the stress and deformation requirements of the design load, andhas a good safety reserve.