FLOOD PROTECTION FOR UNDERGROUND AIR VENTS

An assembly that fits within a ventilation shaft open to atmosphere and leading from underground ventilation ducts such as to subways prevents surface waters from flooding the underground ducts while maintaining the ventilation. The assembly fits in the ventilation shaft and houses a buoyant float i...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	WATERS, Louis, A., Jr
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BUILDING BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES CESSPOOLS EARTH DRILLING FENCING FIXED CONSTRUCTIONS FOUNDATIONS HYDRAULIC ENGINEERING MASTS MINING SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, ORDRAINING IN OR OF MINES OR TUNNELS SEWERAGE SEWERS SOIL SHIFTING SWIMMING OR SPLASH BATHS OR POOLS TENTS OR CANOPIES, IN GENERAL WATER SUPPLY
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