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Method for magnification of bore hole in e.g. clay floor and laying of pipeline into enlarged bore hole, involves rotating outer fitting opposite to direction of inner fitting, and inserting pipeline into bore hole at drilling device
Method for magnification of bore hole in e.g. clay floor and laying of pipeline into enlarged bore hole, involves rotating outer fitting opposite to direction of inner fitting, and inserting pipeline into bore hole at drilling device
The method involves pulling and rotating an inner sleeve fitting (1) of a drilling device (2) by a drill string (4) in a bore hole (3). An outer sleeve fitting (5) is rotated by a drilling engine (6) in the drilling device opposite to a rotation direction of the inner sleeve fitting. A secured pipeline (7) is inserted into an enlarged bore hole (8) at the drilling device. Drilling liquid (9) is pumped into an annular space (10) between the pipeline and a wall of the enlarged bore hole at a rear part of the drilling device through a nozzle (11). An independent claim is also included for a drilling device.
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