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(11) | EP 1 072 754 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Ground removing device |
(57) A device for removing ground (2) comprises a plurality of interconnected jetting
units accommodated next to each other at the leading side of the ground removing device.
Each jetting unit has a jetting chamber (78) which is open at the leading side thereof.
Each jetting chamber (78) comprises a wall at the trailing side thereof. Further,
each jetting unit comprises a first duct (86) for feeding jetting fluid to a jetting
device in the jetting chamber (78), a second duct (87) for feeding jetting fluid to
the jetting chamber (78), and a third duct (68, 90) for removing a ground/fluid mixture
from the jetting chamber (78). The ground removing device is pulled through the ground
by pulling means (12), which comprise one or more drill strings (14; 62; 112) or casing
strings (16). |