Evaluation and control of respirable silica exposure during lateral drilling of concrete.
Cooper-MR; Susi-P; Rempel-D
J Occup Environ Hyg 2012 Feb; 9(2):D35-D41
The primary objective of this case study was to compare silica exposure during lateral concrete drilling using (1) the usual, manual method with a pneumatic rock drill (Figure 1); (2) a movable jig that supports a pneumatic rock drill and increases the distance between the operator and the point of dust generation (Figure 2); and (3) the same jig equipped with a dust shroud and LEV system (Figure 3). A secondary objective was to determine whether use of the jig reduced noise exposure to the drill operator due to the increased distance created by the jig between the point of noise generation and the worker. Future studies will evaluate the ergonomic impact of the jig. Drilling was performed under "experimental conditions" intended to mimic those experienced by laborers on actual job sites. Test conditions were designed so that the independent variables were the use, or lack of use, of the vacuum dust control system, and use, or lack of use, of the jig. A single experienced laborer operated the tested equipment during all experimental trials.
Construction; Construction-workers; Construction-equipment; Construction-industry; Construction-materials; Concretes; Silica-dusts; Power-tools; Silicon-compounds; Respirable-dust; Quartz-dust; Employee-exposure; Silicosis; Exposure-assessment; Exposure-levels; Exposure-limits; Particle-aerodynamics; Case-studies; Dust-control; Dust-control-equipment; Dust-exposure; Pneumatic-equipment; Pneumatic-tools; Road-construction; Noise-control; Vacuum-equipment
Michael Cooper, The Lippy Group, LLC, 1380 Grizzly Peak Blvd., Berkeley, CA 94708
Cooperative Agreement; Construction
Journal of Occupational and Environmental Hygiene
CPWR-The Center for Construction Research and Training, Silver Spring, Maryland