Construction Technology for Accumulative Extension and Synchronous Jacking of Large-span Hyperboloid Steel Grid
The steel grid structure of the roof at Poyang Railway Station comprises an orthogonal quadrangular pyramid with flat sides and a slightly elevated middle section,creating a two-directional hyperboloid shape.Challenges arose during the assembly and placement of the welded large-span hyperboloid sphere roof steel grid structure,including welding and assembly operation at heights,organization of regional cross-construction,and stringent safety management requirements.To tackle these challenges,drawing on insights from the overall synchronous jacking technology for grid structure construction,the paper proposes an accumulative extension and overall synchronous jacking method.This method commences from the middle area of the waiting hall,progressing towards both sides until the entire grid structure is fully assembled.Ultimately,the entire structure is synchronously jacked to the predetermined height,with an accumulative jacking distance of 21.59 meters.Using this technology to put the grid in place can ensure both construction quality and safety,offering a valuable reference for the construction of similar special-shaped curved-surface steel grids.
NETL
NSTL
万方数据
