EXPANDING DRILL DEVICE

Abstract: the invention relates to an expanding drill device for expanding a pilot bore produced from a starting point to a target point in the ground along a specified drilling line by moving the expanding drill device () along the specified drilling line in order to produce a bore in the ground or in rock for introducing a pipeline or a supporting system into the expanded bore, comprising: a housing (); a drill head () that has a cutting wheel () which is arranged on the drill side () of the expanding drill device () so as to be rotatably mounted and driven about a rotational axis and relative to the housing and on which at least one drill tool () for loosening the ground or the rock is arranged; and a drill-side connection for producing a connection to a pipe section located in the pilot bore on the drill side, wherein the drill side () centrally has at least one receiving chamber () for the loosened ground or the loosened rock, said receiving chamber being connected to a material conveyor device of the expanding drill device () for the loosened ground or the loosened rock via at least one removal opening (); the drill side () has at least one drill chamber () that is equipped with the cutting wheel (), which is arranged about the receiving chamber (); the cutting wheel () has an annular design and is rotatably arranged about the central receiving chamber (); and the receiving chamber () is connected to the drill chamber () via at least one conveyor opening () so that the loosened ground or the loosened rock can be conveyed into the receiving chamber () through the conveyor opening (). according to the invention, at least one crusher () is provided in the drill chamber (); the crusher () has crusher strips () on the rotatable cutting wheel () which move together with the cutting wheel () and crusher strips () on the receiving chamber () side facing the drill chamber () which are rigidly arranged together with the receiving chamber (); and the crusher strips () are arranged relative to one another such that a crusher gap () is produced between the crusher strips.

Inventor(s): Lutz ZUR LINDE, Tobias ENGEL

CPC Classification: E21B7/28 (Enlarging drilled holes, e.g. by counterboring)

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