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Boring device for e.g. placing gas transporting pipe below road, has centering unit traversed through tubular shaft, and floating unit surrounding tubular shaft and supporting part of weight of device by boring mud during boring operation
Boring device for e.g. placing gas transporting pipe below road, has centering unit traversed through tubular shaft, and floating unit surrounding tubular shaft and supporting part of weight of device by boring mud during boring operation
The device has a reamer (1) comprising a tubular shaft (3) connected to tubular arms (4). A centering unit (11) is traversed through the shaft and fixed to the shaft, where interior (5) of the shaft communicates with interior (12) of the centering unit by channels (13). The interior of the centering unit communicates with the exterior by channels (14) traversing a wall (15) of the centering unit. A floating unit (16) surrounds the shaft, and supports a part of weight of the device by boring mud e.g. bentonite mud, during a boring operation. An independent claim is also included for a directed horizontal boring method.
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