The reamer is simply pulled through the existing bore path to enlarge the hole. In this installation, the bore path must be enlarged to accommodate the conduit and a reamer is attached to cut a larger diameter hole. The bore path is typically enlarged to one and a half size the conduit that is being installed. The Pilot Bore, Reamer, & ConduitĪ typical midsize directional drill uses a 4-inch drill bit to drill a pilot bore. The drilling crew always can determine the exact depth and location of the drill bit. An experienced directional drilling crew can navigate and steer the drill bit up, down, right, left, and a combination of varying degrees of each to drill the desired horizontal bore path. The locator then gathers and interprets the information and then gives directions to the directional drill operator on which way to steer the drill bit. The directional drill bit is tracked by a sonde, or radio detection device, housed within its extended connection to the directional drill pipe, the depth and pitch is sent to the surface and received by the walkover locating device. The directional drilling crew are in radio communication with each other throughout the entire process. The entrance pit is used to contain and manage the drilling fluids. ![]() The horizontal bore begins with the directional drill bit entering the entrance pit. Before the drilling begins, the crew pre-plans the bore path to carefully avoid obstructions such as other underground utilities. This area can be strategically placed away from congestion and business activities. A small area is needed to set up the equipment. ![]() As demonstrated in this video, conduits such as water, sewer, fiber, electric, and gas can be installed under very busy intersections without disruption of traffic. Directional drilling is used to install conduits under obstacles such as roads, buildings, and wetlands.
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