Drills and blasts earth and rock excavations to construct underground shafts and tunnels for projects, such as roads, railways, and waterways...
Drills and blasts earth and rock excavations to construct underground shafts and tunnels for projects, such as roads, railways, and waterways: Sets up pneumatic drilling machinery and moves lever controlling drilling action to drill blastholes in $T3tunnel heading$T1 according to spacing, angle, and depth of hole specified by SUPERVISOR, TUNNEL HEADING (construction). Loads blastholes and fires powder charges to loosen earth and rock [BLASTER (any industry)]. Wedges, nails, or bolts timber or steel retaining structures to prevent cave-ins. May work in caissons. When concerned with erection of breast boards (timber bracing) to shore tunnel heading, may be designated Breast Worker (construction).
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