EXCAVATION METHOD OF DEEP HOLE AND DEVICE THEREOF

摘要

PURPOSE:To reduce the cost of construction for a deeply excavated hole by providing rotating and percussing driving sections to the base end of a spiral rod provided with a bit in which air outlet holes are bored to continue excavation while adding to the spiral rod. CONSTITUTION:Rotation and percussion are given to the base end of a spiral rod 1 having the front end provided with a bit 5 in which air outlet holes 9 and 10 are bored in the direction of the excavation and in the opposite direction by a rotating driving section 22 and a percussing driving section 26 on a slide 19 raising and lowering a body frame 14 in the vertical direction. In addition, excavation is made by the bit 5 while supplying air. After that, when the excavation is completed by one piece of the spiral rod 1, the spiral rod 1 is successively added to excavate. Excavated earth, etc., are collected from a a dust collecting port 61 additionally provided to a dust prevention cap 57 upward of an excavated hole section 73. According to the constitution, a deep hole excavation can be efficiently carried out.