Resource-based Takt Time Evaluation of Construction operations: case study

The application of the BIM strategy has marked a step of capital importance of the evolution of the construction sector. BIM allows the creation of three-dimensional models of a building construction project, particularly integrating construction geometrical modelling and analytics relating to project costs and times. Therefore, project managers can develop a complete and systemic model and vision of the project, from design stage to construction stage, for the management of even a single construction operation, allowing the timely monitoring and resolution of any technical problem or safety issue. BIM-based tools can help project and construction managers to implement Lean production philosophy application in the construction sector, or "Lean Construction". This production philosophy is based on the optimization of construction processes, the creation of continuous production flows and the efficiency improvement of the value chain. Unlike the traditional approach, the Lean approach aims at reducing waste and maximizing process efficiency. One important indicator of project efficiency is Takt Time. Takt Time is the time needed to complete a specific project operation, and its evaluation is of capital importance in the context of Lean construction. Data and information provided by BIM models can be used to identify the optimal Takt time, providing valuable information about project duration, organization of timely operations and use of construction equipment. The proposed procedure was applied to a case study of construction of a school building, making possible the quick identification of the most efficient construction site organization, and allowing to create an optimized and coherent project schedule that reflects the dynamics of actual construction processes.