The drill pipe is made up of 4.5 metre long rods that are stored on the drill rig. Once the first rod is in the ground, the drill carriage retracts and a new rod is loaded. The drill rig can carry up to 60 drill rods (270 metres) on board. The hydraulic rack and pinion drive provides sensitive advance and retraction of the drill pipe. The drive itself has a drag chain to protect the hydraulic lines. Once the drill head has reached its target, the retraction pulls lines and empty pipes into the drilled channel. During drilling, a bentonite flush is pumped through the drill pipe to the drill head. The mud exiting the drill head carries the dissolved solids out of the borehole and serves to stabilise the bore channel. The horizontal drilling rigs from AT-Boretec thus achieve distances of up to several hundred metres per day, depending on the soil.
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valuable advice about material selection. In this regard, it is not only the high stresses and strains during operations that play a role but also legal requirements, such as those established by the Machinery Directive”, reports Andreas Willmes from experience.
Smaller repairs such as the replacement of a damaged hose line are usually carried out by AT-Boretec's customers themselves, not least for reasons of time.
"HANSA‑FLEX's dense network of branches is a real plus for our customers here. Spare parts are available everywhere at short notice - both nationally and internationally."