| 摘要 |
<p>The present invention relates to a device for boring the ground by combining a PRD construction method with an RCD construction method and a method thereof. The device comprises: a PR hammer and bit for blow-boring using air pressure; a PR discharge barrel for discharging broken pieces using water pressure; and a PR rod capable of water supply and air supply. A hole of a large diameter is quickly bored by small equipment by implementing a new percussion rotary drill and reverse circulation drill(PR) method for boring by combining the PRD method with the RCD method. Therefore, the PR hole boring device and method increase the efficiency of the entire boring processes.</p> |
