Automatic BIM-based formwork quantification system

Building information modeling (BIM) has significantly enhanced the efficiency of quantity takeoff in construction projects. However, existing BIM-based tools for formwork quantification often lack critical functionalities particularly in handling element intersections, irregular geometries, and practical construction considerations. In addition, many current systems rely on manual reprocessing or require multiple software platforms to reflect updates to the BIM model, which limits their effectiveness in dynamic project environments characterized by frequent design revisions. This study presents the development of a fully automated BIM-based formwork quantification system (BFQS), created in collaboration with a general contractor and validated through real-world implementation. The system focuses specifically on quantifying formwork areas. BFQS operates within a single, integrated Revit-based platform and enables automatic, real-time updates of formwork quantities in both two-dimensional (2D) and three-dimensional (3D) environments. It incorporates advanced modeling logic to accommodate diverse on-site conditions, including stair formwork, intersection deductions, small openings, soft intersections, irregular geometries, and the exclusion of nonformwork elements such as lightweight partitions. By maintaining continuous synchronization with the BIM model, the system effectively facilitates project workflows where frequent design revisions occur, thereby enhancing accuracy and responsiveness throughout the design and construction phases. BFQS addresses key limitations of previous tools by incorporating practical parameter settings that reflect real-world construction conditions, contributing meaningfully to the advancement of BIM-based automation in formwork estimation.