Study On The Mechanism Of Stress Overhanging Scaffold In High-rise Building Construction

With the extensive development of our country high-rise,super high-rise buildings,along with the high-rise building construction scaffolding techniques have also been developed,due to the development of construction technology and technical requirements of the scaffold is not synchronous,resulting in scaffold accidents in China have occurred from time to time,and gradually become obstacles to building technology in our country's health,sustainable development obstacles.Although the scaffold research started in the eighty's of last century,due to frequent accidents caused by scaffold reasons in the construction practice in the practical engineering,scaffold safety gradually obtained the engineering circles,academia,scaffolding technology also gradually get rid of the free workers according to experience the erection of the problem.The introduction of fastener scaffold,enable the building construction in our country the most common bamboo scaffolding fastener scaffold gradually being replaced,fastener scaffold has gradually become the main form of our country's building construction scaffold.Through the summary of our country in recent years the scaffold accident,and the related accidents are analyzed and summarized,and Research on Construction in different construction process under live load,analyze the actual loading equipment weight function and other projects taking place,find out the load has an important effect on the stability of the whole frame,and carry on the reasonable combination of the cantilever scaffold,find out by the mechanism of force under normal loading conditions,and reasonable pass the bar force approach;this paper analyzes the construction units commonly used cantilevered scaffolding forms,various erection erection method of structure form,lap side parts,a cantilevered frame numerical analysis model is simulated and analyzed using finite element method software,the establishment of Overhanging Scaffold models,analysis of the various bars,affect parts arrangement mode on the bearing capacity of structure stabilityThis paper draws the following conclusions by numerical simulation:(1)set scissors,scaffolding,scaffolding is greater than the carrying capacity of not setting scissors scaffold,set inside and outside pole scissors,the bearing capacity of more than just set up outside scaffold pole scaffolding scissors,has a significant impact and scissors angle to the scaffold bearing capacity.(2),scaffolding setting wall connecting piece,bearing capacity of scaffolding scaffolding than did the settings even wall pieces,even the wall member is arranged to greater density,bearing capacity of scaffolding is bigger also,is a single wall load area is small,the scaffold stabilized bearing capacity more.(3),horizontal scissors setting and not on the bearing capacity of the scaffold did not affect the basic.(4),the vertical bar between the bracing setting can significantly affect the bearing capacity of the scaffold stabilized,relative to the vertical bar between the bracing scaffold is not set,set the bracing scaffold bearing capacity increase obviously,and not synchronous high set of braces scaffold stability bearing capacity have significant effects,each set a high bearing capacity when the root diagonal bracing scaffold relatively greater than a BBK setting bracing scaffold for maximum carrying capacity.Combined with the engineering examples,by scaffolding scaffolding erection of checking a height of not more than 18m,is used in 48*3.5mm steel,step 1.8m,span 1.5m is the most economical erection scheme,in meet the requirements of the construction of the cost of materials,artificial mechanical,period is relatively reasonable.