AIR DUCT GUIDE

PROBLEM TO BE SOLVED: To prolong a ventilation air duct in a tunnel in accordance with an excavated length of the tunnel. SOLUTION: A joint air duct 15 attached so as to communicate an air feed steel pipe line 2 which is composed of pipes having a predetermined length, and which is led from a blower...

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Bibliographische Detailangaben
Hauptverfasser:	HIRAYAMA HIROYASU, HATORI SHUNJI, HOTTA TOSHIAKI
Format:	Patent
Sprache:	eng
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS MINING SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prolong a ventilation air duct in a tunnel in accordance with an excavated length of the tunnel. SOLUTION: A joint air duct 15 attached so as to communicate an air feed steel pipe line 2 which is composed of pipes having a predetermined length, and which is led from a blower in the outside into the inside of the tunnel, with a suction hose 1 which is laid in the tunnel and which can be moved toward the working face of the tunnel as the latter is advanced, is covered with multiple cylinders 20 consisting of a plurality of cylinders 21 assembled in a telescopic structure. Further, a part of the cylinders 21 is slidably extended as the suction hose 1 is moved toward the working face, and accordingly, the multiple cylinders 20 are prolonged over a predetermined length of one of the pipes of the air feed pipe line 2.