Research On Construction Technology Of Large Diameter Ultra-High Steel Tube Concrete Jack-Up Construction

Gradually over the past 20 years,concrete filled steel tube structure is applied to building structure,especially in high-rise building structure,with the increase of building height,steel tube high strength concrete and the application of steel tube high strength concrete structure will also get rapid development.Concrete filled steel tube structure is formed in the concrete filled steel tube and a new type of composite structure.Because of the concrete filled steel tube structure can more effectively play advantage of the two materials of the steel and concrete respectively,at the same time overcome the shortcomings of the prone to local buckling of steel tubular structure.It is quite common in recent years,pumping concrete,the water is not difficult,created and widely used in our country fall behind not non-vibrating concrete construction method,high more simplify the process of on-site pouring concrete and construction.There are temporary watering holes at the bottom of the string,concrete filled with concrete pump bottom-up method,quick,and ensure the quality of water.But due to construction technology of steel tube concrete in steel pipe concrete is poured in the coagulation,cast not intuitive to check quality,in the absence of nondestructive testing method at present,must be determined by the correct construction technology and strengthening the management of the construction process,to achieve the purpose of controlling the quality of finished product,so the correct selection of the construction technology and construction process management is very important,even is the only means of quality control.In this paper,through experimental analysis for concrete mix proportion parameter index,the parameters of the concrete pump and so on.Guarantee for the late large area construction of concrete filled steel tube column.And install concrete in concrete-filled steel tube top overflow time control lever,operators can facilitate precontrol concrete overflow from the overflow hole time,effectively solve the concrete overflow problem.Concrete filled steel tube has been solved by the PDCA circulation principle,the jack-up construction quality problems.In this paper,through a series of research,a certain achievement has been made to obtain technical progress,and the application of research results and engineering practice.However,due to the limited level of the author and the depth of the study,some content of the discussion and the evidence is not enough in-depth,hope in the future work can continue to dig deep and thinking.