This article provides suggestions of control measures for implementing root piles embedded in bedrock. The control measures included the use of the rockdrill to check the elevations of the overburden and continuity of the resistant layer, and to determine the average drilling time to reach design lengths by separating the bedrock into equivalent regions so that the length of the pile embedded in the rock is not shorter than the design. In order to collect the data used in the evaluation of the executive stages of the piles, changes were made to the accompanying table suggested by ABEF (Brazilian Association of Foundations Engineering and Geotechnics). From assessing the obtained data, it was found that the subsoil of the project consists initially of weathered soil followed by granite bedrock, and could be divided into four different geotechnical regions. The use of the rockdrill proved to be a good control tool, ensuring greater precision with regard to the location of the overburden. The analysis of the data of 91 root piles showed that most were drilled in less than two hours, where 70% presented the equivalent of one meter of rock drilled in 20 minutes, providing greater safety in the length actually drilled in bedrock.
Subjects: None provided
Author: Marilia D. Silva, Civil Engineering, Roberto Q. Coutinho, University Professor and Myckelle M. S. Ferreira, Civil Engineering
Publisher: DFI, EFFC