營造廠投標前，仰賴工程估算人員自身的經驗根據業主提供的圖說進行預算工項數量計算，並參考各個預算工項的單價，再加上工程間接費用，編列成本估算，以便進行投標。營造廠得標後，仰賴工程估算人員自身的經驗將預算工項拆解成細項估算工項，並根據業主提供的圖說進行細項估算工項數量計算，再參考各個細項估算工項的單價，編列工程量清單，以便進行分包。由於我國尚未制定預算及細項估算工項數量計算規則，工程估算人員沒有計算規則可以依循，常有計算方法不一致的問題，倘若工程估算人員自身的經驗不足，容易導致漏項。因此，預算及細項估算工項數量計算規則乃工程估算的重要依據。到目前為止，已有不少研究提出應用BIM於成本估算的研究架構。然而，目前尚未制定符合預算及細項估算工項數量計算需求之BIM元件建模規則，以致於應用BIM計算之預算及細項估算工項數量可能無法符合預算及細項估算編列需求。
為了解決上述問題，本研究根據英國皇家特許測量師學會（Royal Institution of Chartered Surveyors，簡稱RICS）制定的NRM 1及NRM 2（New Rules of Measurement）分析預算及細項估算工項數量計算所需資訊，並建立預算及細項估算工項數量資訊知識本體模型展示預算及細項估算工項數量計算所需資訊與BIM元件之關聯，透過SWRL規則語言推論預算及細項估算工項數量計算需要之元件屬性資料，對應LOD規範並分類，發展符合預算及細項估算工項數量計算需求之BIM元件建模規則，針對不易建立之BIM元件，發展Dynamo模組協助建立，以便透過BIM整合預算及細項估算工項數量資訊，最後建構可彙整預算及細項估算工項資訊之Access資料庫，產出符合預算及細項估算編列需求之資訊。

For the bid preparation of the construction company, the cost engineers estimate the quantity of work items by the drawing provided by the owner and his own experience. Based on the work item’s quantity, unit price and the indirect expense of the project, the budget of the project can be calculated. After the construction company is awarded the contract, the cost engineers have to analysis the budget work items, and divide them into detailed measurement work items. The bills of quantity are produced by the quantity and the unit price of the detailed measurement work items for the procurement. However, there is no proper specification for the calculation of the budget and detailed measurement work item’s quantity. The engineers can only complete the calculation with their own experiences. The inconsistent of calculation might appear when the engineers are inexperienced. The Building Information Modeling (BIM) has been used to produce specific information for cost estimation in many research. However, the required information of the budget and detailed measurement work items are still hard to obtain from BIM model, if there is no related model development specification.
This study uses BIM to integrate the budget and detailed measurement work items. First, the budget and detailed measurement work items are analyzed according to NRM to identify the quantity information required. Then the relationships between work items and BIM elements are presented by the ontology model developed according to the required quantity information identified. Next, the Dynamo modules are developed to facilitate the BIM model that can provide the quantity information required by the budget and detailed measurement work items. Finally, the Access database that can help construction managers to generate information for the budget and detailed measurement work items is developed.

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