DRILLING DURING SHAFT-SINKING

A shaft sinking platform 11 has three potholes surmounted by tubes 20. A drilling boom in each of the tubes 20 is moved up and down by means of a winch 23. In the drilling position the boom is held by special clamps.

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Bibliographische Detailangaben
Hauptverfasser:	ALAN HUNT, BRUCE ALLEN GEORGE EDWARD FOSTER
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
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Beschreibung
Zusammenfassung:	A shaft sinking platform 11 has three potholes surmounted by tubes 20. A drilling boom in each of the tubes 20 is moved up and down by means of a winch 23. In the drilling position the boom is held by special clamps.