NCCCO Drill Rig case studies
NCCCO Drill Rig · Put your knowledge to work in context.
The CCO Drill Rig Operator certification is a professional credential administered by the National Commission for the Certification of Crane Operators (CCO), a nonprofit organization founded in 1995. This certification is designed for operators of drill rigs-such as foundation drilling equipment-who must demonstrate the knowledge and skills required to perform their work safely. The NCCCO Drill Rig case studies are 5 cases and about 3,824 words.
1Pile Position Next to a Fill Slope, Gas Main, and Overhead Line
You are planning a 1.1 m diameter, 21 m deep bored pile for a bridge abutment on a former fill site. Geotechnical logs show 3 m of loose demolition fill over stiff clay, groundwater at 2.5 m, and a 200 mm abandoned gas main whose painted locate mark lies 4 m from the proposed pile center.
856 words, about 4 min2Night-Shift Inspection Findings on a Top-Drive Rotary Rig
A top-drive rotary rig has been on site for three weeks. At the start of the night shift, the operator reports the following: the rig sits on steel mats over crushed stone; a carpenter's level placed on the mat shows 1.8% cross-slope; the rig's electronic level reads 0.4° out of level; the mast has not been re-plumbed since the mats were reset.
833 words, about 4 min3Penetration Drop and Hole Deviation in Layered Rock
You are drilling a 1.2 m diameter, 26 m deep shaft with a crawler rotary rig using a soil auger and bentonite slurry. The upper 8 m is loose sand, 8–18 m is weathered sandstone, and below 18 m is hard limestone.
711 words, about 4 min4Lifting a Temporary Casing With the Rig's Certified Lifting Mode
A drill rig with a manufacturer-certified lifting mode is to lift a 6.0 m long, 1.0 m diameter temporary casing weighing 4.2 t. The rigging weighs 0.25 t.
675 words, about 3 min5Gas Service Strike During Shaft Drilling
During a 0.9 m diameter, 12 m deep shaft in a commercial lot, the auger penetrates a 100 mm plastic gas service at 2.8 m. The crew hears a hiss and smells gas.
749 words, about 4 min