ENSAIO ESTÁTICO E DINÂMICO DE PROTEÇÕES COLETIVAS CONTRA QUEDAS DE ALTURA EM CANTEIROS DE OBRAS

Work safety in a construction site concerning the protection against falling from heights consists, most of the times, by a collective protection equipment called body guard and baseboard (GwF). There are several ways to build it, which leads to distinct results in terms of accident prevention performance. The purpose of this article is to do tests of static and dynamic resistance in GwF systems based on the NR18 and NBR 14.718 (2001), which determines the standards for definitive body guard. This article is the result of a research project that aims to assess the quality of the collective protection on construction sites. This experimental research began through the development of a device for performing dynamic and static tests, since the equipment available so far did not allow testing of the varied conditions where the GwF are situated in the construction sites. After the validation of the test equipment, eight different types of GwF were tested. Three different situations were tested considering that the NR18 does not specify clearly the conditions, so the criteria of NBR 14.718, were used because they are best defined, but more demanding. Among the results, after the materials evaluation used in the manufacture, fixing method and clearence of the GwF system, it is possible to observe observed that , in the static test, only 25% of GwF tested resisted to the static force of 80 kg and none resisted to the static force of 150 kg , recommended by NR18 . In the dynamic test, 75 % of GwF resisted the impact of 700 J, however one of the sets has broken, in other words, they would not have served its function of supporting workers.