ROCK ANCHORS â THEN AND NOW - Geosystems, LP
ROCK ANCHORS â THEN AND NOW - Geosystems, LP
ROCK ANCHORS â THEN AND NOW - Geosystems, LP
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Sept<br />
2003<br />
3.1 Drilling<br />
Now:<br />
• Diamond drilling only for reinforced concrete or<br />
very weak structures<br />
• Use down-the<br />
the-hole hole hammer<br />
– Deviation control<br />
– Speed<br />
– Vibrations/pneumatic fracture<br />
• MWD