Rediseño de la pista de pretensado para la producción de prefabricados de la planta de Riobamba de la unión cementera nacional UCEM S. A.

Abstract

The Union Cementera Nacional UCEM S.A. has had a manufacturing plant for prestressed concrete elements in the city of Riobamba since 2007. It was suitable for producing concrete sleepers; however, it has yet to be planned to continue making these products due to low demand. Therefore, this research aimed to redesign this plant to be adapted to the production of new and varied models of prestressed prefabricated elements. The methodology based on the German standards VDI 2221 and VDI 2225 was used to address an appropriate solution, which turned out to be a very effective tool when proposing different options to satisfy the objectives and subsequently choosing the best resource through a quantitative analysis based on the advantages and disadvantages of each model. After selecting the best model for the project, the calculations corresponding to the structural design based on the NEC (Ecuadorian Construction Standard), the AISC 360-22 standard (American Institute of Steel Construction), the design calculations of mechanical elements were based on the book on Machine Design by Robert L. Norton and the book on Mechanical Engineering Design by Richard G. Budynas and J. Keith Nisbett, the calculations were subsequently verified using SAP 2000 and ANSYS software. The maximum capacity demand factor obtained in all structural elements was 0.685, and a safety factor 2 for mechanical components under the maximum required loads. In conclusion, it was possible to meet all the Unión Cementera Nacional S.A requirements, reaching an optimal and effective design