Sliding Construction Technology of Prestressed Inverted Triangular Pipe Truss Steel Roof
The Canton Fair Exhibition Hall phase Ⅳ exhibition hall expansion project is located in the core area of the city,with a complex environment and multiple structural interactions of railways,tunnels,and pavilions.The project has a large volume,complex structure,and high construction difficulty,with a total construction period of only 644 days,which is the shortest construction period of similar projects and puts great pressure on project performance.The steel roof structure of the exhibition hall is a prestressed inverted triangular pipe truss structure with a large volume of steel structures.In response to the characteristics and difficulties of this roof steel structure,research has been carried out from the aspects of shortening the construction period and efficient construction,and an innovative of ultra-long large-span steel truss segmented rhythmic sliding construction technology has been proposed,which means that the auxiliary concrete structures on both sides of the exhibition hall are constructed first and a sliding support system is provided,the sliding of the steel structure roof and the synchronous construction of the main concrete structure of the lower second floor of the exhibition hall have achieved the early insertion and installation of the exhibition hall steel roof,and the construction of various professional plans and facades has been interspersed,greatly shortening the construction period of key lines.The large-span steel truss assembly technology based on prefabricated and self stable high-altitude platforms is developed,achieving rapid assembly of ultra-long large-span heavy-duty steel trusses into units.Aiming at the characteristics of different elevations on both sides of the main structure as a sliding support system,a two-way sliding track is designed,and a needle roller slipper and a power system are developed to ensure the safety and stability of the sliding.The application of inverted triangle prestressed steel strand rapid threading and tensioning technology has solved the technical problems of ultra-long prestressed steel strand threading and tensioning and high-altitude sliding.The hydraulic synchronous control system and intelligent construction monitoring ensure that the stress and strain of the sliding of the large-span super heavy steel truss roof are controllable,and the simulation process is carried out smoothly according to the plan.
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