Research On Critical Quality Control Point Of Formwork Support Frame Based On Construction Field Data

Lots of technical code and management measures has been implemented for safety of steel tubular scaffold with couplers,but formwork support frame accident still happens and Causes a large number of casualties and property losses.In this paper,through the investigation of the field data of the formwork support,we find the weak points in the actual construction to provide specific direction for the quality management of the formwork support frame and reduce the occurrence of the quality and safety accidents.In addition,this paper provides a new engineering quality research method which is based on the construction field data.In this paper,the relevant specifications and construction technology of formwork support engineering are sorted out,and the construction site data which is need to collected and the “standard value” of the related elements of the support frame engineering are obtained.Through the investigation of 22 projects,we collected the actual construction site data to get the “actual value".Then,the data of "real value" are pre-processed and standardized,and the element whose “actual value” is so different from the “standard value” is obtained according to the average value.Then cluster analysis is used to divide the elements into similar clusters and the appropriate number of clusters is chosen.Through the comprehensive analysis of average value ranking and clustering results,we get critical quality control point of formwork support as follows: coupler head,coupler torque,tie member,the horizontal tube connection,base plate of upright tube,upright tube spacing,lift height,horizontal diagonal bracing,treatment of height difference;secondary concern: sweep the gap,pipe quality and adjustable forkhead.These are the critical quality control points in the actual construction of the formwork support frame.By analysing the causes the of the 34 supporting frames accidents,the weak point of the supporting frame is obtained.Then we compare the obtained weak point with the actual weak points based on the construction site data,the similarities and differences between the two are analyzed,and the conclusion is verified.