| 主权项 |
1. A method for plastic pipe drilling when using an apparatus, which has a drilling device comprising a casing part manufactured from a plastic based material particularly for performing plastic pipe drilling and a drilling unit that is arranged at least during a drilling operation essentially inside the casing part, the drilling unit comprising a first drilling part for drilling a center hole and second drilling part for reaming the center hole for the casing part, the first drilling part and the second drilling part arranged at a drilling head of the drilling unit and being coupled mutually at least during a drilling operation in a power transmitting manner in order to carry out cooperation thereof for a rotational motion, a feeding motion and/or a hammering motion and removably or in a radially contrastable manner in connection with the casing part in order to enable removal of the first drilling part or the second drilling part together with the casing part from a drilled hole, and whereby a casing shoe is mounted at an end of the casing part in order to enable pulling of the casing part into the hole to be drilled by the drilling unit through the casing shoe, wherein a casing shoe provided with a working member is used in mounting the casing shoe, whereby the casing part is mechanically worked by upsetting or chipping by the working member in order to achieve a joint between the casing part and the casing shoe that transmits pulling in a longitudinal direction(s) of the drilling unit. |
