摘要
Abstract
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Key words
ultra-wide box girder/multi-truss plate/combined hanging basket/stress distribution/deflection deformation分类
交通工程
