| 摘要 |
A back reamer apparatus is configured to be attached to a pipe section of a drilling rig for back reaming and compacting a pilot bore. The back reamer apparatus includes a body having a front end configured to be coupled to the pipe section, and at least three planar side walls configured to form a pyramid-shaped section which is tapered downwardly toward the front end of the body to compact the soil and form an enlarged bore upon rotation of the body by the drilling rig. The body is formed to include an internal passageway for receiving a drilling fluid. Each of the side walls is formed to include at least one aperture in communication with the passageway to permit the drilling fluid to pass through the at least one aperture formed in each side wall.
|
