Análise da vibração ocupacional e de ruído na utilização de furadeiras na construção civil

Abstract

This study aims to evaluate the exposure to occupational vibration in hands and arms in drilling operations, as well as the noise level generated by them. Measurements were made with drills of different brands and potencies, as well as different drill diameters ranging from home equipment to professional equipment, totaling 1,080 holes in wood (MDF) and concrete.The results showed that the smaller drill bits tested showed lower HAV. And that the more powerful drills tended to generate lower levels of vibration. Also, from the results, it was possible to establish a ratio of the HAV per power of equipment, as well as a table of operation for each proposed scenario. It is concluded, therefore, that in the drilling in concrete, there is a medium vibration for the drill ø6mm, 238,43% greater for the drill of the same diameter in wood. For drill ø8mm, 199.54% larger than drill of the same diameter in wood. And for the drill ø10mm, 253.35% larger than the drill of the same diameter in wood. Therefore, when analyzing the vibration caused by drilling in concrete, regardless of the drill gauge, it is observed that it is on average 3.30 times larger than in wood (MDF). However, even when smaller, the values ​​obtained in MDF can exceed the normative limit of 5m/s². In relation to noise, when drilling concrete, the average levels found were, for the ø6mm drill, 269.14% larger than the same diameter drill for wood, 198.29% larger for the ø8mm drill than for wood drill, and 228.29% higher for the ø10mm drill than for wood. Finally, similarly, the noise level obtained when drilling concrete, regardless of the drill gauge, is on average 3.32 times higher than in wood (MDF).