| 摘要 |
The tube anchor, for use in mining and/or tunneling, has a hollow anchor body (1) and a threaded outer profile (2). The threading is a trapezoid spiral, with an axially parallel foot zone (4) and back (3). The flanks are pitched at an angle (alpha ) of 30-45[deg]. The axial extension (a) of the foot zone is 0.1-0.04 times the diameter (d) of the anchor body. |
