摘要
某工程顶部共设有4榀片式主桁架,12榀片式次桁架,桁架跨度达34 m,最大重量达45 t;因结构自重较大,安装位置较高,利用液压提升器将桁架整体提升,可降低现场高空施工量和安装施工难度。提升平台最大下挠度约6.8 mm,杆件最大应力比约0.48,满足提升要求;吊具最大应力约223 MPa,最大变形约0.33 mm,满足提升施工要求。3榀桁架跨中最大下挠度约9.6 mm,结构杆件应力比均小于0.5,桁架最大提升反力约451 k N;单片桁架提升工况下最大变形约3.3 mm,杆件应力比均小于0.5,满足提升要求。
Four-frame primary truss and 12-frame assistant truss were used in a project, The truss span is 34m and the largest truss has a weight of 45t. Considering the heavy structure weight and high installation position, hydraulic lift was used to lift the whole truss to reduce the high-altitude construction workload and installation difficulty. The maximum down-warping deflection is about 5.8mm and the maximum stress ratio of lifting bar is about 0.48, which could satisfy the lifting requirements; the maximum stress of the lift is about 223MPa and the maximum deformation is about 0.33mm, which could also meet the lifting requirements. The maximum down-warping deflection of the midspan of three-frame truss is about 9.6mm, the stress ratio of structural member is less than 0.5 and maximum lifting reactive force is abOut 451kN; during single truss lifting, the maximum deformation is about 3.3mm and member stress ratio is less than 0.5, satisfying the lifting requirements.
作者
柴文静
张新爱
CHAI Wen-jing ZHANG Xin-ai(Baoding Vocational Technology Institute, 071000, Baoding, Hebei, China)
出处
《建筑技术》
北大核心
2017年第2期152-154,共3页
Architecture Technology
关键词
钢桁架
同步提升
最大下挠度
应力比
最大变形
steel truss
synchronous lifting
maximum down-warping deflection
stress ratio
maximum deformation
