logging in or signing up UNDER SEA TUNNELS loudiiichakkiii Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 109 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: January 09, 2012 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript UNDER SEA TUNNELS : UNDER SEA TUNNELS WHAT IS UNDERSEA TUNELLS : WHAT IS UNDERSEA TUNELLS An undersea tunnel is a tunnel which is partly or wholly constructed under a body of water. They are often used where building a bridge or operating a ferry link is impossibleSURVEY WORKS : SURVEY WORKS Establishment of new control points (horizontal and vertical) near the work area. Bathymetric surveys Alignment and level control of the trench by an automation system during excavation.PowerPoint Presentation: Controlled immersion of a tube was performed by combination of different survey equipments The position of the immersion barge was determined by RTK-GPS survey methodConstruction of Undersea Tunnel: Construction of Undersea Tunnel STEP : 1 Temporary Earth Retaining Structures (TERS) are installed along the proposed tunnel alignment to provide a dry area for tunnel construction at a later stage.Sand Filling within TERS: Sand Filling within TERS STEP : 2 To reduce pressure acting on the retaining structures. Sea water is subsequently pumped out.Excavation and Strutting works : Excavation and Strutting works STEP : 3 Excavation to tunnel base level (at 20m below mean sea level) is carried out in layers, with struts installed progressively to support the temporary earth retaining walls. Tunnel Base Tunnel Wall Construction Construction : Tunnel Base Tunnel Wall Construction Construction STEP : 4 The tunnel base, walls and roof are constructed in stages with the progressive removal of struts. Waterproofing membranes are added.Tunnel Roof Construction: Tunnel Roof Construction Protective concrete slab is constructed on top of the tunnel roof.Backfilling of Tunnel Box: Backfilling of Tunnel Box STEP : 5 On completion of the tunnel box construction, the completed tunnel is backfilled with sand up to sea bed level.Completed Tunnel Box: Completed Tunnel Box STEP : 6 The temporary earth retaining structures are removed Sea water is allowed to flow above the completed level.INTERIOR STRUCTURE OF TUNNELS : INTERIOR STRUCTURE OF TUNNELS List of notable examples : List of notable examples EXISTING TUNNELS Seikan Tunnel Channel Tunnel Eiskund Tunnel TUNNEL UNDER PLANNING Tunnel from Russia to AlaskaSeikan Tunnel : Seikan Tunnel runs between the islands of Hoshu and Hokkaido in Japan . world's longest undersea railway tunnel 53.9 km long when non-undersea portions of the tunnel are also measuredstructure of Seikan Tunnel : structure of Seikan Tunnel Typical tunnel cross section. (1) Main tunnel, (2) service tunnel, (3) pilot tunnel, (4) connecting galleryChannel Tunnel: Channel Tunnel It is a rail link between England and France world's longest undersea portion railway tunnel It measures 37.9 km longEiksund Tunnel: Eiksund Tunnel A new world record for deepest under-sea tunnel was set in Norway on the 31st May of this year A depth of 266 m under mean sea level was reachedRussian Bering Sea tunnel : Russian Bering Sea tunnel The world’s longest under planning tunnel will run under the sea in the Bering Strait and connect Russia directly to Alaska In total, the proposition calls for 6,000 km of infrastructure. Conservative estimates put the project completion time at around thirteen years.Advantage : Advantage One such advantage would be that a tunnel would still allow shipping to pass. A low bridge would need to be an opening or swing bridge to allow shipping to pass, which can cause traffic congestion.Disadvantage : Disadvantage Tunnels require far higher costs of security and construction than bridges. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
UNDER SEA TUNNELS loudiiichakkiii Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 109 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: January 09, 2012 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript UNDER SEA TUNNELS : UNDER SEA TUNNELS WHAT IS UNDERSEA TUNELLS : WHAT IS UNDERSEA TUNELLS An undersea tunnel is a tunnel which is partly or wholly constructed under a body of water. They are often used where building a bridge or operating a ferry link is impossibleSURVEY WORKS : SURVEY WORKS Establishment of new control points (horizontal and vertical) near the work area. Bathymetric surveys Alignment and level control of the trench by an automation system during excavation.PowerPoint Presentation: Controlled immersion of a tube was performed by combination of different survey equipments The position of the immersion barge was determined by RTK-GPS survey methodConstruction of Undersea Tunnel: Construction of Undersea Tunnel STEP : 1 Temporary Earth Retaining Structures (TERS) are installed along the proposed tunnel alignment to provide a dry area for tunnel construction at a later stage.Sand Filling within TERS: Sand Filling within TERS STEP : 2 To reduce pressure acting on the retaining structures. Sea water is subsequently pumped out.Excavation and Strutting works : Excavation and Strutting works STEP : 3 Excavation to tunnel base level (at 20m below mean sea level) is carried out in layers, with struts installed progressively to support the temporary earth retaining walls. Tunnel Base Tunnel Wall Construction Construction : Tunnel Base Tunnel Wall Construction Construction STEP : 4 The tunnel base, walls and roof are constructed in stages with the progressive removal of struts. Waterproofing membranes are added.Tunnel Roof Construction: Tunnel Roof Construction Protective concrete slab is constructed on top of the tunnel roof.Backfilling of Tunnel Box: Backfilling of Tunnel Box STEP : 5 On completion of the tunnel box construction, the completed tunnel is backfilled with sand up to sea bed level.Completed Tunnel Box: Completed Tunnel Box STEP : 6 The temporary earth retaining structures are removed Sea water is allowed to flow above the completed level.INTERIOR STRUCTURE OF TUNNELS : INTERIOR STRUCTURE OF TUNNELS List of notable examples : List of notable examples EXISTING TUNNELS Seikan Tunnel Channel Tunnel Eiskund Tunnel TUNNEL UNDER PLANNING Tunnel from Russia to AlaskaSeikan Tunnel : Seikan Tunnel runs between the islands of Hoshu and Hokkaido in Japan . world's longest undersea railway tunnel 53.9 km long when non-undersea portions of the tunnel are also measuredstructure of Seikan Tunnel : structure of Seikan Tunnel Typical tunnel cross section. (1) Main tunnel, (2) service tunnel, (3) pilot tunnel, (4) connecting galleryChannel Tunnel: Channel Tunnel It is a rail link between England and France world's longest undersea portion railway tunnel It measures 37.9 km longEiksund Tunnel: Eiksund Tunnel A new world record for deepest under-sea tunnel was set in Norway on the 31st May of this year A depth of 266 m under mean sea level was reachedRussian Bering Sea tunnel : Russian Bering Sea tunnel The world’s longest under planning tunnel will run under the sea in the Bering Strait and connect Russia directly to Alaska In total, the proposition calls for 6,000 km of infrastructure. Conservative estimates put the project completion time at around thirteen years.Advantage : Advantage One such advantage would be that a tunnel would still allow shipping to pass. A low bridge would need to be an opening or swing bridge to allow shipping to pass, which can cause traffic congestion.Disadvantage : Disadvantage Tunnels require far higher costs of security and construction than bridges.