If the equipment cannot fit into the allowable entry area, the owner/engineer should be contacted to resolve the problem. Fencing should be installed to restrict access and ensure public and worker safety. The work areas should be laid out in accordance with the specifications and traffic control plans. While the equipment is being set up, the entry and exit areas should be delineated using traffic cones and construction tape or flagging. ![]() Care must be exercised to avoid contact with underground utilities during stake-down, and to ensure sufficient reaction can be developed for thrust and pullback. Machines often are staked down, using the powered rotating augers located on either side of the spindle at the front. If the entry point is within a paved area, the pavement must be removed using a jackhammer or concrete saw, depending on the owner/engineer's requirements. A small pit usually is excavated over the entry point, using a backhoe or shovel. The entry angle usually is between eight degrees and 16 degrees, although entry angles of up to 20 degrees have been used on some large diameter projects. Depending on the rig size and entry angle, this distance may be 3 feet to 20 feet behind the entry point. Getting Started The drill rig is off-loaded and positioned over the bore centerline a sufficient distance behind the entry point to allow for the carriage height and entry angle, such that the drill bit will enter the ground at the correct location and angle.
0 Comments
Leave a Reply. |