Integral Lifting Technology And Construction Simulation Of Large-span Steel Truss

The method of integral lifting is a construction method of steel structure installationwhich is widely used in China in recent years. It has the advantages of high mountingaccuracy, safety and reliability, the short construction period, and so on.And it also shows thegreat advantage and development prospect in technique.Through the analysis on the hydraulic integral lifting and synchronous control principle,the characteristics of hydraulic integral lifting technology was illustrated by composing ofhydraulic lifting system. In this paper, the skiing park project of Wandamao in Harbin wastaken as the research background. The large-span steel truss roof applied integral liftingtechnology in this project. On the basis of the construction thoughts of integral lifting, theconstruction process of integral lifting was analyzed.From two aspects of system design andsystem arrangement, the hanging points design, layout and the lifting equipment installationwere studied. The speed control and synchronous control method in integral lifting wasanalyzed and the promotions after integral lifting was expounded in the paper. Theengineering used the adjustment of the frame pole length to solve the installation problem ofthe slope in the project. The horizontal displacement control system was adopted to solve theproblem of large horizontal displacement during lifting. It shows certain guiding significancefor similar engineering practice.Using Midas/Gen software, both synchronous lifting and non synchronous lifting wereanalysed, and the strength of members in non synchronous lifting were checked. When thenumber6lifting point is not synchronized, the maximum stress ratio of the structuralmember is0.81lower than1, and the members have a certain margin of safety, which meetsthe design requirements. On the basis of the lifting frame and concrete modeling analysis, thestrength of lifting frames ware checked, it is seen that the maximum stress ratio of the liftingbracket is0.92lower than1, and the position of the connecting member is in the middle link..Using ABAQUS software, force and deformation of the lifting sling were analyzed. It is seen that the spreader the maximum stress is347.8MPa, the maximum displacement of thespreader is6mm, which meets the requirements of strength and rigidity. Moreover, thestrength and stiffness of the lifting node were checked. It is seen that part region of the jointgo into the plastic zone, which can not meet the requirements of the design. Recommendedplus two seal plate in the first node of H section steel plate on both sides.Combined with the engineering example, the lifting points’ layout of structure wasstudied. Comparing with all kinds of lifting point layout, finally the scheme two was choseas the best one. And in view of the additional stress of construction process, the calculationmethod was proposed. Taking0.9as the bar stress ratio control index, the190memberswhich exceed the standard were replaced.