| 摘要 |
The invention relates to a method and apparatus for plastic pipe drilling, which apparatus has a drilling device (1 ) that consists of a casing part manufactured from a plastic based material and a drilling unit (3) that exists inside the casing part, which drilling unit (3) includes first drilling means for drilling a center hole and second drilling means (5) for reaming the center hole for the casing part (2). The drilling means (4, 5) are coupled mutually in power transmitting manner during drilling and they are removable from each other or arranged to be contractible radially, in order to enable removal of the drilling means from a drilled hole. A casing shoe (8) is being mounted at an end of the casing part (2) for pulling of the casing part (2) into the hole to be drilled by the drilling unit (3). The casing shoe (8) is provided with working means (X), whereby the casing shoe (8) is being mounted at the end of the casing part (2) by cutting threads in the casing part (2), in order to achieve a joint (Y) between the casing and the casing shoe (2, 8) that transmits pulling in a longitudinal direction of the drilling unit (3). |
