- 期刊
- OpenAccess
BIM數量計算方法之比較
COMPARISONS OF BIM-BASED QUANTITY TAKEOFF METHODS
摘要
近年來，建築資訊模型(BIM)於工程數量計算上之成效逐漸彰顯，國內業界與學界大都以Autodesk Revit建模並進行數量，亦有學者結合Revit 與Autodesk QTO 進行數量計算，然對於是否需要加入QTO 進行數量計算，仍有多項問題尚待釐清，例如為結合QTO 之步驟、結合QTO 計算結果之差異以及搭配QTO 之優缺點等，故本研究分別就Revit 單獨進行數量計算與Revit 結合QTO 進行數量計算之方法進行探討。研究結果顯示，單獨以Revit 進行數量計算時，雖不必轉換模型至QTO 中，但會面臨篩選條件與數量計算公式設定上之限制，且須將各個元件分別建立明細表進行計算，再手動加總；而當Revit 結合QTO 進行數量計算時，雖可將全部數量計算於同一表單中，但每次模型更動時，則需要重新匯出模型至QTO 中，不過因其可透過以工項資訊(例如混凝土)做為分類之搜尋條件，而整合於同一表單中，將提高與成本估算軟體PCCES 結合之可行性。最後，本研究亦指出上述兩種方法，皆無法產生公共工程所需之數量計算書，亦即將BIM 運用至數量計算之實務運用上，尚有極大的改善空間。
並列摘要
In recent years, the benefits of applying Building Information Modeling (BIM) to support quantity takeoffs have been significantly recognized. Autodesk Revit is one of the most popular software packages adopted for quantity takeoffs. Autodesk QTO is another easily-accessible package that can be combined with Revit to facilitate quantity takeoffs. Whether or not to combine with QTO remains questions to be answered. The objective of this study is to compare the two quantity takeoffs methods, namely, ＂only-Revit＂ and ＂Revit-with-QTO＂. The results show that the only-Revit method has restrictions in filtering quantity takeoff items and in setting quantity takeoff formulas. Moreover, the quantity takeoffs of a particular cost item (e.g., concrete) associated with each BIM object (e.g., column or beam) are generated separately, thus requiring further effort to sum up those individual results. On the other hand, the Revitwith- QTO method can obtain the total quantities of a cost item associated with all BIM objects in one time, thus facilitating its favorable integration with a cost estimation software package (e.g., PCCES). However, if the BIM model is revised, the Revit-with-QTO method requires to convert the BIM model to QTO again and repeat the quantity takeoffs process. Lastly, this study indicates that both method fail to produce a quantity takeoff report (required for all public construction projects) for double-checking its calculation process. This finding implies that applying BIM to support quantity takeoffs still needs further improvement.