以六標準差改善營造業流程噴漿作業之研究

Cement Mortar Spraying Process Quality Improvement by Six Sigma Methodology

李國樑(Kuo-Liang Lee)

《清雲學報》 32卷1期 (2012/01) Pp. 15-28

https://doi.org/10.7049/JCYU.201201.0017

摘要

本研究是以個案研究的方式展現六標準差管理針對營造業噴漿流程進行改善。依照六標準差管理DMAIC（Define-Measure-Analyze-Improve-Control）的方法論，本研究之步驟，首先將問題清楚定義，接著再利用六標準差管理的工具－流程圖展開找出噴漿作業的輸入及輸出變數，並透過因果矩陣圖來找出關鍵輸入因素。再利用統計方法，例如：變異數分析（ANOVA）和Fisher's LSD檢定來驗證真正影響的因素為何及利用失效模式分析進行改善以防止關鍵輸入變數失效。最後則是透過施工過程的重新規範，如：訂定明確的噴嘴仰角操作規劃且設定抽查的機制，讓員工在操作不易發生錯誤，除此之外，藉由管制計畫來有效的管控水泥攪拌的均勻度、噴頭的清洗頻率、水泥與砂配合比例等關鍵變數以降低各關鍵因素發生錯誤的頻率。本研究專案小組透過六標準差管理的討論機制發展出新的改善方法，成功的降低不良發生率，同時也驗證了六標準差品質改善手法確實提供了本研究實質之效益。

關鍵字

六標準差 ； 噴漿作業 ； 個案分析 ； 品質改善 ； 營建業

並列摘要

This research demonstrated a cement mortar spraying process quality improvement project using Six Sigma methodology. Based on the Six Sigma DMAIC approach, the quality problem was defined at first. Secondly, the input and output variables are explored by Six Sigma tools. Thirdly, statistical tools, such as ANOVA and Fisher's Least Significant Difference (LSD) Test, were used to validate what the key point input variables (KPIVs) are and Failure Mode and Effect Analysis was used to improve the process. Finally, the control method was utilized control key point input variables such as nozzle elevation, cement mixing uniformity, frequency of nozzle cleaning and the proportion of cement and sand in order to avoiding variation happened again in process. The quality improvement team succeeded reducing cement mortar spraying process defective yield in this case. The result of studies proved that the Six Sigma methodology is feasible and efficiency to implement on construction engineering quality improvement. It is worthy of introducing this methodology into the construction engineering fields.

並列關鍵字

Six Sigma ； cement mortar spraying process ； case study ； quality improvement ； construction industry