Importance

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Abstract

A device for drilling a bore hole in the ground comprised of a rotary drive head and a hollow Connecting Rod Assembly on which the rotary drive head acts and which can be lowered into the hole in the ground through the rotary drive head. A tool head with several Drilling Hammers that work downwards and that are operated with a fluid driving medium are provided on the lower end of the Connecting Rod Assembly. In the case of an initial design form, a Rotary Connecting Head is located in the upper area of the Connecting Rod Assembly; a fluid driving medium under high pressure can be supplied to the upper end of the Connecting Rod Assembly through the rotary connecting head, and the rotary connecting head has a transition chamber in its Housing, sealed in the axial direction towards both sides and connected to an external Supply Line for the fluid operating medium. Several ring seals, grouped in stages in the axial direction and hydraulically pressure-balanced stage-by-stage, are provided in each case on both sides of the transition chamber. In the case of a second design form, the driving is done in an oscillatory fashion around a limited angle, which permits the use of flexible supply lines for the feed-in of scavenging and operating media and the discharge of excavated material.

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First Claim