Mejoramiento de la vía que une el sector Huapante Chico, hasta el Barrio San Isidro - Andagualo, Parroquia de San Andrés del Cantón Santiago de Píllaro Tungurahua con la finalidad de mejorar la vialidad del sector

Abstract

The current project proposes the improvement of the road alignments that connects the Huapante Chico zone with the San Isidro – Andagualo neighborhood located in the San Andrés district of the Santiago de Píllaro city, Tungurahua province. The intervention section has an approximate length of 4.3 kilometers. The project aims to improve the traffic flow conditions of this crucial and primary mobility artery, considering that this roadway facilitates the transportation of farm products from the local area to the main markets of the city and the province. Currently, the road visualizes a significant deterioration over its asphalt surface layer which in short term generates adverse conditions for the safe and uninterrupted vehicle traffic. The main objective is to define a geometrical and structured solution that ensures continuous service and the capacity to meet future demand. The methodology used includes topographic surveying using GNSS, and an inventory in which 2,444 points were recorded, a mountainous land with steep slopes were also confirmed as well. A seven-day vehicles circulation test was held and as a result it was realized that an average of 355 vehicles per hour pass by the roadway daily and it was projected that within the latest 20 years a number of 981 vehicles will pass by per day. All the projections were developed using TPDA. A laboratory test also identifies that three out of the five samples were sandy silts of low density (ML & A - 4), one sample of clayey sand (SC and A-4), and one silty sand (SM and A-2-4), with CBR values ranging from 5.2% to 14.2%. Considering the results, a horizontal and vertical alignment and the road section were redesigned. The proposal includes two 3-meter lanes, 0.5-meter shoulders on both sides of the road, a −2% cross slope, triangular ditches measuring 1.11 meters wide by 0.3 meters deep, cut slopes with an H:V ratio of 1:1, and fill slopes with a V:H ratio of 1:1.5. The structure of the flexible pavement includes a 10-cm asphalt surface, a 15-cm base layer, and a 20-cm subbase, giving a total thickness of 45 centimeters, with a referential budget of USD 1,697,706.04. It was concluded that the road fosters socio-economic progress of the region and improves accessibility and safety