| 摘要 |
In the region of its insertion end, the draw body (6a-6d) has a screw line-formed part (6a) of greater dia. externally than the internal dia. of the casing (7). The casing and draw body are driven into the material using a cable-less drilling machine, the chuck of which has an adaptor which fits onto the shaft (6a) of the draw body. Once inserted by rotation, a draw tool (12-14) is threaded on to the shaft end, and exerts an axially outwardly directed force against the draw body. The transition part between the shaft (6a) and the screw-line (6b) deform the casing as it is anchored in the material. |
