Silos with internal cones:

		Duisburg, Germany, cement plant
		Mannersdorf, Austria, cement plant
		Vernasca, Italy, cement plant

 

other References:

Egg Shaped Digesters Standart Digesters BIMA-Digesters Climbing formwork - Steel Climbing formwork - Wood Self excavating tanks/shafts Segment formwork Water Towers Windmill Towers Telecommunications Towers Other Towers Funnels Silos with internal cones Special Structures Tunnel