Patent ID: 8550187
Filing Date: 2013-10-08
Classification: E02D

Abstract:
1. A drilling apparatus for working the ground, the apparatus comprising: a drill drive for driving a drill string in a rotating manner, a construction material hose to carry a construction material to be pumped through the drill string and into the ground, a rotary feedthrough arranged above the drill drive and on an upper side of the drill string and positioned coaxially with the drill string for passing the construction material from the construction material hose into an interior of the drill string, a first line connection connecting the construction material hose to the rotary feedthrough, a second line connection connecting to the drill string, the second line connection is further coupled to the first line connection via the rotary feedthrough, wherein the rotary feedthrough includes a rotary device adapted to actively rotate the second line connection relative to the first line connection so that a rotary motion of the drill string is compensated actively to prevent bending or winding of the construction material hose around the drill string or the drill drive, a controller configured to control the rotary device to compensate for the rotation of the drill drive such that the rotary device is synchronized diametrically opposed to the drill drive, and a rotation pick-up for determining the rotational speed and the direction of rotation of the drill string, wherein the rotation pick-up is connected with the controller.