營建工程專案的執行過程存在有許多無法預期且不可避免的不確定因素，使得專案進度落後。因此，承包商或管理者須執行趕工計畫，可能導致成本增加、品質下降、意外風險增加等問題。許多的施工單位因業主要求工程的施工進度而進行趕工，因此疏忽營造施工安全管理問題，造成職業災害發生機率較一般行業為高。因此，本研究提出專案趕工之時間、成本、品質與安全的權衡模式來分析趕工問題，並以非線性二次曲線來分析工期與直接成本之關係。另外，也提出模糊趕工模式，以模糊理論來分析在趕工期間所面臨不確定性的趕工成本與施工安全性。最後本研究使用兩個案例來驗證明確型與模糊型兩種模式之應用，以期達到縮短工期、降低成本、提升施工品質與降低安全風險的目標。

On the execution of construction projects there are many unexpected and unavoidable factors, such that the project is behind the schedule. Therefore, the contractor or manager shall be implement catch-up plan, it result in increasing construction costs, reduction of quality, loss of construction safety and other issues. Many contrators due to the owner’s requirements to reduce the duration of construction works so as to neglect construction safety, it cause the construction occupational accidents higher than the other industry. Therefore, this study proposes a crashing project’s time, cost, quality and safety trade-off model to analyze crashing problem and nonlinear quadratic curve to analyze the relationship with the duration of the direct costs. In addition, a fuzzy crash mode, it using fuzzy theory to analyze the situation when execution crash plan facing uncertainty of crashing cost and construction safety. The last, using two cases in this study to show the certain model and fuzzy model , to shorten the construction duration, lower costs, improve construction quality and reduce the accident risks.

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