Bermingham Reverse Circulation Drills
Berminghammer drills represent the most ruggedly designed and extensively field-tested all-purpose drills in the foundation industry. Berminghammer drills can be used in almost every type of drilling application and specialize in Down-the-Hole- Hammer applications. There is simply no better choice for foundation contractors than a Berminghammer drill.
Productive drilling occurs when the majority of the time spent on-site is devoted to actually drilling. Many competitor drill rigs involve time draining activities such as: long rig-up times, difficult and time consuming pile placement, adding more and splicing piles. Bermingham drilling systems are intelligently designed to minimize these deficiencies and maximize production rates through hard rock. Bermingham’s leads are most often designed to allow for one stroke, meaning that there is no slow installation of additional drill string and no pile splicing necessary. Berminghammer drilling systems are the most maneuverable on the market thanks to the patented combination with the Vertical Travel Lead. This maneuverability greatly decreases setup time so that the majority of time is spent drilling. The Berminghammer lead systems in conjunction with our hydraulic drills, drill string, impact hammer and custom rotary bits allow for execution of drilling, driving and rock socketing efficiently and seamlessly.
Reverse Circulation Drilling
‘Reverse Circulation’ drilling involves the supply of air down through the drill-string to decrease the ‘effective density’ of the water in the center of the drill-string. Operating much like an ‘air-lift’, the drilling spoils are carried out of the hole through this rising column lower-density air/water mixture (see Figure below). Reverse Circulation requires that the outer annular area of the casing be kept full of water in order to provide the hydraulic head required to effectively ‘push’ the central column of air/water/spoils up and out of the hole through the central pipe of the drill-string. Reverse Circulation is an effective drilling technique for a wide range of hole diameters including very large holes – up to 3-m diameter and larger. It is also effective for very deep holes, and holes drilled into hard-rock. Another advantage of Reverse Circulation is the ability to control/direct the drilling spoils by simply directing the discharge pipe to the desired site location or even to a dedicated barge (for environmentally sensitive, overwater applications). This cannot be accomplished with direct circulation which allows water and cuttings to spill out of the top of the pile. Reverse Circulation can be used in conjunction with rotary drilling bits as well as Down-the-Hole-Hammer applications. The Berminghammer Reverse Circulation Drills are particularly well suited to Down-the-Hole-Hammer applications due to their simple, rugged design and construction.