Análise do método de trabalho em um posto de ensacamento na mineração: um estudo de caso com enfoque ergonômico e operacional

Abstract

This study aimed to analyze the work method of a bagging station in the mining industry through the integrated application of ergonomic assessment tools and time study, with the purpose of proposing improvements to reduce physical workload and enhance operational performance. The methodology included the application of the Rapid Entire Body Assessment (REBA) method, the Nordic Musculoskeletal Questionnaire, and time study techniques, enabling a comprehensive evaluation of the physical and organizational demands of the activity. The results revealed high ergonomic risk levels, particularly associated with pronounced trunk flexion during the manual handling of 25 kg bags, with REBA scores classified as high risk. The Nordic Questionnaire indicated recurrent complaints in the lower back region at the end of the workweek, corroborating the findings of the postural analysis. The time study showed that the operational cycle is short and highly repetitive, with an average duration ranging from 3.90 to 4.25 minutes, intensifying cumulative physical overload throughout the workday. In response to these findings, low-cost and highly feasible ergonomic and organizational improvements were proposed, considering the company’s constraints regarding layout modifications and major investments. The main intervention highlighted is the adaptation of the transport cart, including base height elevation and the introduction of a sliding surface, aiming to reduce manual load lifting and the biomechanical demands imposed on the operator. The proposed measures are aligned with the principles of Regulatory Standard NR-17 and are expected to contribute to the reduction of fatigue, musculoskeletal discomfort, and ergonomic risk, thereby supporting the sustainability of operational performance.