Study On Construction Quality Improvement Of Inter-story Isolation System Based On Six Sigma

With the rapid development of China's economy,the level of urbanization continues to rise,and all regions have vigorously developed infrastructure construction,and built a large number of comprehensive terminals through which subways and high-speed railways pass.Based on the terminal's requirements for comfort,safety and large space,a large number of floor isolation systems will be constructed.At present,the size of the isolation support used in domestic buildings is mostly below 1.0m.The construction enterprises have insufficient experience reserves for the construction of the lower pier of the large-diameter isolation support and the installation of the isolation support.Does the original process meet the future needs? It is not yet known that this issue urgently needs further study.In this paper,the lower piers of a layered seismic system with a bearing diameter of 1.5m in an airport terminal are used as research vectors.By combining Six Sigma and quality control methods to study the quality of the lower piers in the process,the distance from the previous layer is found.The key factors of the quality of seismic system,and find the corresponding control measures.In the early stage of the study,Six Sigma was combined with existing quality control methods,a quality management system was established in the prior control stage,and the plan was optimized to reduce the process error rate.Introduce the DMAIC improvement process in the quality control of the incident,through the definition,measurement,analysis,improvement and control of defects,find the key factors and their control measures,and finally achieve the purpose of quality control.Afterwards,quality control collects the process results and forms an experience file.In this paper,this method is used to improve the quality problems of the supporting layer of the pier under the seismic isolation system of an airport.In the initial plan of the project,the steel bar and steel bar avoidance,the adjustment of the concrete ratio,the column top grouting,the positioning measures of the embedded parts and the concrete vibration are proposed.Five optimization measures such as pounding holes.VOC / VOB is used to determine the number of hollowing and cracking in the lower strut joint layer.Through brainstorming and flow chart,find out all possible factors,use the qualitative analysis in the original quality management method for preliminary screening,and use FMEA's quick-win measures to quickly solve the maintenance time and maintenance method,and find possible key factors as a table Temperature difference and template height.Using multiple regression analysis,find the regression curve between the difference in surface temperature and the height of the template and the hollowing and cracking of the combined layer,and pass the P value test to find the key factors.Using matrix graph,linear fitting,binary and ternary fitting,find the improvement measures that meet the target requirements for grouting when the difference in surface temperature is ?5 ?.Time series analysis,I-MR chart analysis and two-sample T-test analysis were performed on the samples before and after improvement,which proved that the quality improved significantly.After improvement,the average value of hollowing and cracking of a single bonding layer has changed from 1.77 to 0.44,which has reached the target requirement.The final results show that the difference between the large-diameter layered seismic system and the previous layered seismic system is that the top joint layer is hollow and cracked,which is mainly due to the excessive temperature difference of the lower support pier.The measure to solve this problem is to measure the temperature difference of the surface temperature,and to ensure that the temperature difference of the surface temperature of this part is controlled within a certain range during grouting.