Construction technology of reaming once with raiseborer in large diameter staple shaft

Aiming at the problems such as low efficiency and poor safety in the construction of large diameter staple shafts，shaft reaming once with raiseborer was put forward.This paper introduces the selection，layout，transportation and installation of the equipment，the construction process and precautions of the pilot hole and raise hole.The technology has been applied in the shaft construction successfully in the coal，non-metallic minerals，hydropower and other underground engineering.Practice shows that the new technology realizes the safe economy and high efficient construction in large diameter staple shaft，through the selection of modular raiseborer，split-connected steel beams，spliced reamer and other equipment，transporting by the crawler chassis，hoisting by multiple sets of rock bolts installed in the roadway roof，reasonable arrangement of stabilizers，strict control of drilling parameters in the process of construction，based on the consideration of the machine's weight，size and lifting point.