AVALIAÇÃO DO PROJETO DE DRENAGEM DA OBRA DE RESTAURAÇÃO, AUMENTO DE CAPACIDADE E DUPLICAÇÃO DA RODOVIA MGC-491 / ENTRº BR-381

Abstract

The MGC-491 - Varginha / Entrº BR-381 - Três Corações duplication, capacity building and restoration project was carried out by a company located in Belo Horizonte. Due to the few visits in the field and often for lack of necessary information, the situations presented in the project end up diverging from the reality found at the time of execution. The problem is that ideas, statistical data, graphs and analysis create a scenario, which, while convincing, does not represent reality. To the detriment of this, the present study dealt with the methods of designing the devices of current works of art and the procedures necessary to carry out the hydrological studies. In addition, a field survey was carried out to verify the condition of workability of the existing 0.40 m diameter sewers, and a case analysis of the design guidelines for these devices, with notes for possible solutions by virtue of the convention adopted for not using this diameter, because it has a limited flow capacity and presents difficulties in maintenance and cleaning. The hydraulic capacity of these devices was verified and the solution suggestions presented to maintain, replace or remove the aforementioned culverts were investigated based on the calculated flows for the contribution sub-basins. The collection and analysis of the geographic data were based on UTM coordinates taken from Google Earth and from topographic charts presented by the Brazilian Institute of Geography and Statistics (IBGE); the rainfall data were analyzed according to data obtained by the National Water Agency (ANA). The result found in the field study for the 0,40m diameter culverts was that 52% should continue with the orientation of following the one specified in the project, to be maintained; 25% to be suitable with 0.60 m, 0.80 m or 1.20 m shackles, and the remaining 23%, with exclusion orientation of the established extension, being gutters for collecting the flowing and discharge in other existing sewers and / or designed with larger shackles. Based on the results found, it was verified that the changes can be executed without loss of the hydraulic condition. However, it had a major financial impact. These changes need to be, and have been, implemented so that the execution is standardized as established by the City Hall and the local Department of Edification and roads.