Análise comparativa do levantamento de quantitativos entre o método manual e a plataforma BIM

Abstract

The quantitative survey is a very important step for the civil construction area, because it defines the scope of the project and the listing of the items related to the execution of the work, as well as the budget of the project. The precision of this stage can be a differential for the decision making by a client or a construction company, as it is a basis for the feasibility study. Currently, quantitative surveys are performed mostly by manual methods with the help of CAD tools, however, this process may present flaws and inaccuracies due to errors that propagate throughout the survey. Therewith, Building Information Modeling (BIM) technology, through its 3D modeling, automatic project update and error and interference identification, is able to quantify the materials and services of a project more accurately. So, the present project aims to perform a comparative analysis between the two methods. For this purpose, two different projects were selected, interpreted and analyzed for the case studies, one of them being the design of a house and the other of a building, applying the two types of quantitative survey, the manual with the aid of a CAD tool and the automatic with the platform BIM, which together have a value that exceeds 50% of the total of a work. It was sought to identify how much is and what are the reasons and the impacts of the difference between the two methods, pointing out the fastest and most accurate for the quantitative survey and, consequently, for the budget of a work. Thus, percentage variations of approximately 7% were found using BIM, with the main points of divergence in masonry and finishes.