Modelo para seleção de motoniveladoras durante a elaboração de orçamentos

• Autor(a) principal: Rebouças, Guilherme Paiva
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/36507
• topic: Transportes; Orçamento; Equipamentos - Seleção; Máquinas para terraplenagem - Custos; Selection of motor graders; Budget; Technical characteristics; Hourly cost

A roadbuilding has considerable costs in its design and especially in its execution. One of the main causes is the extensive use of heavy equipment in these works, both for earthmoving and paving services. However, although the costs related to the equipment represent one of the most relevant itens of a roadbuilding budget, there are a small number of research related to the improvement in the equipment selection process. In addition, there is a great difficulty in associating the technical characteristics provided by the manufacturers with productivity and hourly costs of using the equipment. This work aims to develop a model that assists in the selection of a specific type of earthmoving equipment (the motor graders), during the elaboration of budgets, based on the technical characteristics of the operational weight, maximum power and width of the blade, besides of productivity and costs criterias. Initially, the equations and parameters adopted in calculating the production and hourly costs of a motor grader were determined. A survey of motor graders commercialized in the local Fortaleza/CE market was carried out, gathering their acquisition values and their technical characteristics (operational weight, maximum power and blade width) required to calculate production and hourly costs. Applying the deterministic equations and adopted parameters, the production and hourly costs of each motor grader used in the sample were then calculated. Subsequently, through the sample of 17 machines of different models and brands and through the statistical method of regression and correlation analysis were determined the mathematical equations of production estimation and hourly costs, which gave origin to the proposed model. The result obtained for the developed model, based on the used evaluation method, was satisfactory and indicates that the model is adequate and allows the Cost Engineer to perform the selection of a motor grader directly, resorting only to the manufacturer's specifications.