(OSHA) Innovative concrete drill jig reduces silica exposures

A University of California ergonomics team has designed an innovative concrete drill jig that is proving to be highly effective in limiting worker exposures to respirable crystalline silica, as well reducing fatigue and risk of musculoskeletal injuries. It also increases productivity – a bonus for McCarthy Building Company, Inc., which is using the jig in renovating an historic building in downtown San Francisco. The jig can drive multiple large hammer drills at different angles and heights, and is mounted on a base that allows it to move easily around a construction site. A vacuum collects dust generated by the drill bit.

When a laborer drilled into concrete using a pneumatic rock drill by hand, the team measured silica dust levels that were 14 times higher than the recommended exposure limit set by the National Institute for Occupational Safety and Health. But with the jig and dust-capturing device, the exposure level is below the recommended exposure limit. The jig is one of many ways employers can limit worker exposures to silica. For more information on the project, visit the OSHA Website