| 摘要 |
Method and device for boring holes (1) through layers of earth using a rotating, hollow control rod (5) connected to a bore crown (3). Fluid is flushed down through the control rod (5) so that loose drilled material is lifted up through the hole (1) between the control rod (5) and the wall of the hole. After drilling has been completed, the hole (1) is filled with cement (2), moistened with water and the control rod (5) is fed down through the hole under rotation, during which further cement is filled in the hole until the wall of the hole is cemented so that it is hard and flat. A bench drilling aggregate with separate rotation is used for drilling and the control rod is made up of a rotating, hollow rod, which cross-section has at least one corner or wing, is square and has somewhat smaller dimensions than the bore crown so that it guarantees a straight hole.<IMAGE> |
