Foundations are the first part of building a structure, and failing to properly engineer the base of a building renders subsequent actions pointless. To assist in accurate and strong anchors, Boart Longyear has introduced a new DeltaBase (DB) 95 model, a self-propelled drill rig aimed at the foundation construction market.
Based on a tracked platform for stability and grip on construction sites, the DB 95 leaves a minimal footprint while moving the 10,000-lb (22,050-kg) machine around difficult terrain. The pendulum crawler base, balanced at one end by the motor and the drill at the other, requires no stabilizer jacks.
Possible applications include tieback and soil-nail drilling. Tieback applications are most often used to hold retaining walls against the pressure from material behind them, to support temporary walls during foundation construction, or to secure hillsides next to roadways. Soil nails transfer forces into the soil or loose rock material and can stabilize slopes, anchor support structures, and hold guy wires for towers. In both cases, the DB 95 drills into the ground and inserts a temporary casing. The anchor is then inserted and the temporary casing removed to be used again.
Such varied applications mean that the DB 95 must use a mast design with wide range of movements. The MasterLink system from Boart Longyear allows quick setup by maintaining exact and consistent drilling angles as the mast articulates. As one hole is finished, the machine can retract and move to the next location, keeping the same angle between the holes.
Several drill head options are available including a percussive drill with three heads; a hydraulic drifter, which is a rotational drill; and a dual rotor, which has two rotary heads, one turning an inner rod and the other turning the outer casing in the other direction. All are available in different sizes and configurations.
Power for the complex hydraulic systems comes from a Deutz TCD 2013 L04 2V four-cylinder diesel, developing 105 kW (141 hp), which powers the 300-L/min (80-gal/min) axial piston pump. Maximum torque of 15,000 N·m (11,000 lb·ft) applies across the range of heads. Onboard controls are supplemented by remote driving controls, enabling the operator to get a better view of the site, co-workers, and drill angles as necessary.