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13.4.3.4 Immersed tube tunnel. The segments of the immersed tube tunnel are made of C45 concrete, and the segments are mostly prefabricated but cast in place for the connection part (approach) of the tunnel to the artificial islands. The assessment covers only the prefabricated segments of tunnel. The extrados of the segment is physically ... Visit website
Immersed tube tunnels are used in situations where building a bridge is undesirable, unsightly, or environmentally unacceptable, to provide road, rail, or utilities across bodies of water. As such, these tunnels are extremely rare, with just over a hundred having been constructed worldwide. At WSP, we have been involved with multiple immersed ... Visit website
Abstract. Immersed tube tunnels are composed of prefabricated sections placed in trenches that have been dredged in river or sea bottoms. The sections are usually constructed at some distance from the tunnel location and made watertight with temporary bulkheads. They are then floated into position over the trench, lowered into place, and joined ... Visit website
Immersed tube tunnels; Summary; Added; Modified; Illustrated; List; Ranking; Media; Reports; Diagram; Literature; Most Important Structures in this Category. entry with pictures new entry (30 days) updated entry (14 days) # Name Country length; 1: Marmaray Tunnel: Turkey 13600 m 2: Westerschelde Tunnel: Netherlands 6600 m 3: Transbay Tube: Visit website
The 1.7 mile-long Fort Mc Henry Tunnel considered the most expensive tunnel project at that time—at $750 million—involved the construction of 32 immersed tube elements. Visit website
BART - Transbay Tube (San Francisco County, California) Built 1969; Opened 1974. Tunnel under San Francisco Bay on BART. Open to traffic. Baytown Tunnel (Harris County, Texas) Built 1953, Closed 1995, Demolished 1997-1999 due to the deepening of the Houston Ship Canal. Lost Tunnel under Houston Ship Channel on TX 146. Replaced a new bridge. Visit website