Produtividade variável em obras de terraplenagem de vias urbanas com diferentes níveis de interferências: um estudo de caso

Abstract

Delays in road works result in financial loss. The productivity of the services is necessary to calculate the deadlines, which can vary significantly depending on the ambience and type of work. Productivity indexes can be found in the usual Composition by Unit Price (CPU) tables, prepared by agencies such as Caixa Econômica and infrastructure agencies in states and municipalities. However, this productivity estimate may not be representative when in ambiences with a high degree of interferences, as in the case of road works in large urban areas. The Municipality of Fortaleza, state of Ceará, is responsible for the road infrastructure works in its area. A project in the Canindezinho neighborhood, in this city, served as a case study to assess the impact of three different variables that can impact productivity: road width, underground connections and overhead wires. The study analyzed separately the correlation of productivity of several stretches with the variation of these three characteristics. The service analyzed, specifically, was the ground cut. For this, the excavated volumes and the time used in the excavation service were calculated. The conclusions were that the Unit Production Ratio (RUP) varies with the street width following, with R² of 0.716, an exponential function. The other two variables – underground connections and overhead wiring – resulted in variations of 23.49 and 29.38%, respectively, for more in the RUP, meaning a decrease in productivity. With these results and the equation of the variation of the RUP by the width of the street, a tool was created to assist in decision-making in the planning of the works. It is a spreadsheet that has as input the characteristics of the road to be executed and, as data output, productivity and service end dates.