超宽箱梁多桁片组合挂篮施工技术研究  

作　　者：徐荣鹏[1] 郑涛 

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]重庆城建控股(集团)有限责任公司,重庆400013

出　　处：《科技创新与应用》2024年第29期173-177,共5页Technology Innovation and Application

摘　　要：该施工技术采用前上横梁、后上横梁将4片三角式主桁架主纵梁连接成整体形成多桁片组合挂篮。组合式挂篮的多片纵梁能有效地分配悬浇混凝土荷载,能避免由于梁段过重导致的主纵梁局部失稳现象,降低已浇节段混凝土的拉压应力(锚点抗拉反力和中支点承压力)。且梁段浇筑时,底模平台的底纵梁共同受力,协调变形,能有效防止挂篮前面发生扭转失稳,提高整体横向稳定性。多桁片组合挂篮总重约177 t,占最大节段重量的39.3%,具有自重轻,刚度大、变形小,结构简单,受力明确等特点,能有效解决超宽截面梁段在挂篮悬臂施工时的应力分布和挠度变形问题。由于使用通用设备,具有较好的参考意义。In this construction technology,the front upper beam and the rear upper beam are used to connect four triangular main truss longitudinal beams to form a multi-truss composite hanging basket.The multiple longitudinal beams of the combined hanging basket can effectively distribute the suspended concrete load,avoid the local instability of the main longitudinal beam caused by the overweight of the beam section,and reduce the tensile and compressive stress of the cast segment concrete(anchor tensile reaction force and middle fulcrum bearing pressure).When the beam section is cast,the bottom longitudinal beam of the bottom formwork platform is subjected to common force and coordinated deformation,which can effectively prevent torsional instability in front of the hanging basket and improve the overall lateral stability.The total weight of the multi-truss combined hanging basket is about 177 t,accounting for 39.3%of the maximum segment weight,which has the characteristics of light weight,large stiffness,small deformation,simple structure,clear force and so on.It can effectively solve the problem of stress distribution and deflection deformation of ultra-wide cross-section beam during the cantilever construction of hanging basket.Due to the use of general equipment,it has a good reference significance.

关 键 词：超宽箱梁 多桁片 组合挂篮 应力分布 挠度变形 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]