Bowl-Scaffold Formwork Supports System Design And Construction Monitoring

In the past few decades,the construction industry has experienced rapid development.with the development of construction industry upgrade,the big span,Super High-rise,and all kinds of complicated structural type of buildings is becoming the norm,high formwork supports system,more and more applied to the construction site.In order to meet the technical requirements of rapid construction project,China has introduced Bowl-Scaffold,fastener scaffold,such as various forms of scaffold from abroad,where the Bowl-Scaffold used widely in actual engineering.But in recent years the country has repeatedly occurred formwork supports system collapse accidents due to design,improper construction and other aspects of reasons,the vast majority occurred in the process of concrete pouring.Therefore,engineers need pay particular attention to related design of formwork supports system and the change process of the whole support force and displacement in the concrete pouring process.In this paper,the detailed design and safety and stability checking work of the formwork supports system have been done based on the Suzhou Metro Line station main structure support projects in Hefei,to take different specifications.In the process of concrete pouring,analysis the force variation of each member Bowl-Scaffold formwork supports system through field monitoring.This paper put forward some suggestions of scaffold building according to rules.Finite element analysis and eigen value buckling analysis the force of entire scaffold in the process of concrete pouring by MIDAS and ANSYS.After study above,the conclusions follow as:(1)Standing tube was the overall state of compression on field monitoring and standing tube in the same axis all showed that the upper axial force is larger than the lower,which is because the constraint of diagonal bracing share part of the internal force that should have been passed down,so that the upright rod axial force data is larger than lower.Standing tube local subjected to tension because of the concrete uneven pouring.(2)Each standing tube axial force to be less than the theoretical design value under the actual load.(3)In the process of concrete pouring,horizontal arm change is more complex,The forced state is difficult to determined by the theory.(4)In the process of concrete pouring,the force and deformation of members in a reasonable range.Explained the entire scaffold is safe and reliable in the process of concrete pouring.(5)Finite element simulation results for each standing tube stress state consistent with the actual monitoring.But the value of simulation larger than the value of actual monitor,because the articulated point weaken the contribution horizontal arm to the standing tube Capacity.Eigenvalue buckling analysis obtained the weakest stiffness point of entire support system at the uppermost of standing tube.(6)Improve the design of the entire scaffold on the basis of studies,improved entire scaffold loading is reasonable.