Vermeer steers clear through it - The Vermeer ROCKFIRE AS system is a patent pending steerable pneumatic rock drilling system designed to drill and steer in rock when used with Vermeer NAVIGATOR horizontal directional drills.
Available on the D24x33 and larger horizontal directional drills, Rockfire AS systems open up new markets for drilling contactors to complete short to medium length bores in varying rock formations.
Feature: Impact Cutting Technology
Benefit: One of the most efficient method of cutting hard rock with a bit, this system has comparable production rates to other rock drilling methods on the market today.
Feature: Steerable Impact Bits
Benefit: A variety of bit styles are available for differing rock formations and steering characteristics and can tackle rock up to 40,000 psi. While certain ground formations can diminish steering capabilities, field reports are very positive on the AS4's ability to steer. Common steering capabilities range in the 4-6% range per 15 ft. stem. Impact bits cost less than similar sized tri cone roller bits used with other rock drilling methods.
Feature: Uses Conventional Drill Stem
Benefit: Benefit 1: The machine does not have to be used as a dedicated rock drilling system or have the drill stem changed out when going from rock to conventional drilling. Benefit 2: Standard Firestick drill stem, with its high torque and flow capabilities, allows the same drill to open the hole as to make the pilot bore. Benefit 3: If hole opening will be required, the conventional drill stem does not limit drilling fluid flow like dual rod systems. Benefit 4: This system does not require an inner drive rod through the drill stem that restricts flow and needs regular maintenance. Benefit 5: Conventional drill stem has a better bend radius and does not limit the machine's rod carrying capacities.
Feature: The AS4 Hammer Assembly with Bit is only 66" in Length
Benefit: Smaller size reduces the physical space required for machine setup.
Feature: The AS4 Uses Standard Transmitters
Benefit: Allows bore depths to the limit of standard locating transmitters (potentially 70 ft.). Some competitive systems utilizing 4" cutting bits and inner drive shafts must use "mini" transmitters, limiting bore depths to 10-15 ft.