The present invention relates, among other things, to a method for manufacturing a downer hole drilling equipment for drilling plastic pipes. The downer hole drilling rig has a drilling device for performing drilling using a drilling unit 3 with a plastic pipe 2, the drilling unit having a first drilling means 4 for drilling a central hole and A drilling device, such as a second drilling means 5 for expanding the central hole for the plastic pipe 2, is included in the drilling head. The plastic pipe (2) is a drilling unit (3) such as a second drilling means (5) or a casing shoe (8) coupled with a second drilling means in a manner that transmits force in at least the longitudinal direction (s) of the drilling device It is arranged to be pulled into the hole to be excavated by the influence of the force from the hole to the hole. The drilling unit (3) and the plastic pipe (2) are, for the drilling unit (3), a skirt part at the opposite end (II) of the drilling device, such as a second drilling means (5) or casing shoe (8). They are joined together by (z), the skirt portion has an inner protruding assembly (x) in the radial direction (r), and by pressing the skirt portion (z) together in the radial direction (r), the end of the plastic pipe ( A contact surface K is formed along the outer surface of I) in the longitudinal direction s, to pull the plastic pipe 2 into the hole to be excavated by the influence of the force transmitted from the contact surface. The present invention on the other hand also relates to a downer hole drilling rig for being manufactured according to the method.
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