Construction method of fire preventing and extinguishing channel on goaf target area ground

The invention discloses a construction method of fire preventing and extinguishing channel on the goaf target area ground. The construction method comprises the following steps: step 1, vertically performing primary drilling in a sandstone layer on the goaf target area ground to form a first drill h...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	JIA SHAOPING, SU MINGJIN, LI CHUANJIE, LI YOUJUN
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS SHAFTS TUNNELS
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