FEED DEVICE FOR FEEDING CONCRETE AND GAS INTO THE DRILL STRINIG OF DRILLING UNIT DURING THE FORMATION OF A CONCRETED BOREHOLE AND METHOD FOR FORMING A CONCRETE BOREHOLE

摘要

The invention relates to a feed device for feeding concrete and gas into the drill string of a drilling unit during the formation of a concreted borehole, having a drill string connection for connection to the drill string, a concrete connection for connection to a concrete conveying unit, a gas connection for connection to a pressure gas source, a line arrangement via which the concrete connection and the gas connection are in communication with the drill string connection, a concrete valve which is provided in the line arrangement and with which a communication between the concrete connection and the drill string connection can be shut off, and a gas valve which is provided in the line arrangement and with which a communication between the gas connection and the drill string connection can be shut off. It is thereby provided that the concrete valve comprises a mechanical actuation element for actuating the gas valve, whereby the mechanical actuation element is arranged so that the gas valve shuts off when the concrete valve is opened. The invention also relates to a method for forming a concreted borehole by means of this feed device.