METHOD OF TRENCHLESS PIPELINING MAINLY UNDER WATER BARRIERS AND PROTECTED AREAS Russian patent published in 2008 - IPC E02F5/18 

FIELD: mining.

SUBSTANCE: invention concerns construction and mining and can be applied in long-distance trenchless pipelining. The method involves drifting by directed drilling of a rathole and its subsequent expanding, drawing a draw tube in a form of a sequential drill pipe column into the well, drawing a pipeline into the expanded well with the help of a draft unit 6 located at the other end of the well. Drifting and expanding of the well is implemented by a drilling rig 5 from the high bank 1, with a mouth 7 formed, by drilling of vertical and sloping 9 sections, followed by a horizontal section under the bed of a water barrier 2, then the well is equipped with casing pipes. With casing pipes as conductors, the expanded well is drifted further with steady rise ending after the protected zone in the floodplain. The well is expanded by a turbodrill with a step-face bit connected to the draft unit 6 by a flexible link. The pipeline is drawn by the drilling pipe column with the help of the drilling rig 5 and draft unit 6.

EFFECT: expands possible distance and depth of pipelining under various obstacles.

8 cl, 7 dwg