Design And Application Of New Asymmetric Hydraulic Jacking Formwork For Super High-rise Building

Super high-rise building is an effective way to balance the limited land area and insufficient space at the present stage.However,due to the significant differences in design and construction between super high-rise building and conventional building,its form is complex and changeable,which brings great challenges to construction technology.Affected by the high-altitude working environment,the safety problems of traditional construction technology need to be solved,hydraulic jack-up formwork came into being.In the actual application process,the hydraulic jacking formwork is continuously iterated and upgraded according to the change of building structure form,and develops from standard structure to asymmetric structure.In this paper,a new type of asymmetric hydraulic jacking formwork is designed,and its feasibility is studied by means of theoretical research,finite element simulation and engineering application.It will have certain guiding significance for further improvement of the key technology of super high-rise hydraulic jacking formwork.The main research work is as follows :(1)Structural design of new asymmetric hydraulic jack-up formwork.This paper studies the characteristics of the new asymmetric hydraulic jack-up formwork in practical application from the aspects of working principle,structure and construction principle.By innovatively proposing a new type of asymmetric hydraulic jack-up formwork,its adaptability and safety in variable structural forms are solved.(2)Research on mechanical model of new asymmetric hydraulic jack-up formwork.This paper analyzes the stress form and failure mode of the main components of the new asymmetric hydraulic jack-up formwork,simplifies the complex structure,and puts forward the mechanical model of the main components,which provides theoretical support for the application of the new asymmetric hydraulic jack-up formwork in the field of super high-rise building construction technology.(3)Finite element simulation analysis of new asymmetric hydraulic lifting formwork.Combined with the practical application of hydraulic jack-up formwork in Zhenjiang Suning project,a new asymmetric hydraulic jack-up formwork structure model is established,and various working conditions are applied.The finite element calculation and analysis of the structure are carried out by Midas Gen software.The application of the new asymmetric hydraulic jack-up formwork in practical engineering is simulated,and the stress and deformation distribution differences of the support column and box girder when the hydraulic jack-up formwork is arranged asymmetrically are analyzed,which provides guidance for the design of jack-up and support system.At the same time,the key components of the hydraulic formwork,such as steel formwork,hanger system and hydraulic cylinder,are checked for safety,which verifies the safety of the new asymmetric hydraulic jacking formwork system in the construction application process..(4)Application system design of new asymmetric hydraulic jack-up formwork.Based on the demand of asymmetric hydraulic jack-up formwork hydraulic jack-up formwork in super high-rise building construction,this paper puts forward the basic design principles of the formwork,analyzes the preconditions that need to be considered in the design of the formwork and the requirements that must be met in the construction application,and systematically puts forward the design model of each unit in the new asymmetric hydraulic jack-up formwork,such as support and jack-up,steel platform,formwork,hanger and synchronous jack-up control,which provides reference for the application of the new asymmetric hydraulic jack-up formwork to various super high-rise building projects.