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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。
The top of a project has a total of 4 榀 slice main truss, 12 榀 slice truss, truss span of 34 m, the maximum weight of 45 t; due to the larger structure, the installation location is higher, the use of hydraulic hoist the whole truss Enhance, can reduce the amount of high-altitude construction site and the difficulty of installation and construction. The maximum downward deflection of the platform is about 6.8 mm, and the maximum stress ratio of the rod is about 0.48, which meets the lifting requirements. The maximum stress of the spreader is about 223 MPa and the maximum deformation is about 0.33 mm, which meets the requirements of hoisting construction. The maximum deflection of the truss was about 9.6 mm, the stress ratio of the structural members was less than 0.5, and the maximum lifting reaction force of the truss was about 451 kN. The maximum deformation of the truss was about 3.3 mm in the lifting condition, 0.5, to meet the lifting requirements.