Hampton Roads Bridge Tunnel Expansion: Overview Of Tunnel .
Hampton Roads Bridge Tunnel Expansion:Overview of Tunnel Construction MethodsFebruary 21, 2018James S. UtterbackHRBT Project DirectorVirginia Department of Transportation
Ten Hampton Roads TunnelsChesapeake ChannelTunnel (1964)Hampton RoadsBridge-Tunnel(1957 & 1976)Thimble ShoalTunnel (1964)Monitor-MerrimacMemorial BridgeTunnel (1992)MidtownTunnel(1962 & 2016)2/21/2018DowntownTunnel(1952 & 1987)22
2/21/2018 9 tunnels are steel-shell immersed tubes 1 tunnel is concrete-box immersed tube Future tunnel #11 at Thimble Shoal will be bored 1965196019551950Midtown Tunnel #2Monitor-MerrimacDowntown Tunnel #2Hampton Roads #2Midtown Tunnel #1Thimble Shoal #1& Chesapeake #1Hampton Roads #1Downtown Tunnel #165 Years of Tunneling in Hampton Roads3
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Proposed Tunnel Alignment(Hampton Side)2/21/201855
Proposed Tunnel Alignment(Norfolk Side)2/21/201866
Proposed Lane Configurationfor Tunnel and Approach Bridges 2 1 1 concept in each direction: 2 free General Purpose lanes 1 full-time HOT lane 1 peak-hour HOT lane on left shoulder2/21/20187
Tunnel Considerations Landside work has risks but is largely conventional Tunnel work is less conventional and will generate greater risksfrom a contracting standpoint E.g. Midtown Tunnel contract’s limit of liability was tested against apotential scenario involving construction impacts to existing tunnel This is a rare location where both immersed-tube and boredtunnel construction methods are feasible All ten Hampton Roads tunnels to date have been immersed tubes Until recently, bored tunnels were not feasible in soft soils But recent advances in technology now make bored tunnelspossible in soft soils These methods were directly compared in the nearby ThimbleShoal Tunnel procurement in 20152/21/20188
Immersed-Tube Tunneling (ITT)Images property of respective owners.2/21/20189
New Midtown Tunnel SectionUtilityCorridorJet FansEgressCorridorImages propertyof respective owners.2/21/201810
Parallel Thimble Shoal Tunnel(initial concept)Proposed ThimbleShoal ChannelTunnel (SB Traffic)#2 IslandExisting ThimbleShoal ChannelTunnel (NB Traffic)Approximate Edgeof Existing Island#1 Island11
Bored TunnelingTunnel boring machine “Bertha,” recently at work in SeattleImages propertyof respective owners.2/21/201812
Interior of SR99 Tunnel in Seattle(57.5’ external diameter, 52’ internal diameter)2/21/201813
Key Differences between Boredand Immersed-Tube Tunneling Alignment ITT alignment must be further away from existing tunnel (HamptonRoads typical practice about 200 feet) Bored tunnel can be much closer to existing facilities (estimate onother projects about one diameter 50 feet) Geotechnical ITT method has limited concern for soil properties, since soil alongtunnel path is dredged out and removed Bored method is specifically tailored to local soil properties Environmental and Permitting Section 408 coordination with marine stakeholders / federal channel Section 103 concurrence for offshore disposal of ITT spoils Joint permit covering upland disposal of bored-tunnel spoils2/21/201814
Immersed Tunnel Considerations Concept design Approx. 7,500 ft. longApprox. 3.5 million cubic yards dredged materialDredged trench approx. 90 ft. wide with 3:1 side slopes Navigational considerations at channel Trench dredgingPlacement & screeding of gravel beddingImmersion of tunnel elementsPlacement of cover fill Other navigational considerations 2/21/2018Barge transport of dredged material for ocean disposalIsland expansion (fill & armor stone)Limited additional geotechnical investigation is anticipated15
Bored Tunnel Considerations Concept design Approx. 8,300 ft. longDeeper than immersed-tube tunnel because more cover is needede.g. for buoyancy control – therefore tunnel is longer4% roadway grades likely require island expansion lengthwiseApprox. 1 million cubic yards excavated tunnel materialGround improvement at islands to support weight of tunnel boringmachine Navigational considerations 2/21/2018Additional geotechnical investigationsIsland expansion (fill & armor stone)16
Procurement Milestones and Next Steps Initial outreach to industry in April 2017 Follow-up with potential proposers in January/February 2018 Firms expressed interest in both tunnel-construction methodsMilestonesRequest for QualificationsQualifications DueShortlist AnnouncementRequest for ProposalsContract AwardProject Completion2/21/2018Target DateDecember 15, 2017March 2, 2018April 2018Spring 2018Early 2019202417
Questions?18
Feb 21, 2018 · Downtown Tunnel #1 Hampton Roads #1 Midtown Tunnel #1 Thimble Shoal #1 & Chesapeake #1 Hampton Roads #2 Downtown Tunnel #2 Monitor-Merrimac Midtown Tunnel #2 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 65 Years of Tunneling in
Downtown Tunnel #1 Hampton Roads #1 Midtown Tunnel #1 Thimble Shoal #1 & Chesapeake #1 Hampton Roads #2 Downtown Tunnel #2 Monitor-Merrimac Midtown Tunnel #2 1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020 9 tunnels are steel-shell immersed tubes
Future tunnel #11 at Thimble Shoal will be bored tunnel Settlers Landing in Hampton to I-564 Norfolk (9.5 Miles) I-64 improvements include 6 lanes of highway and construction of 4 lane bridge/tunnel New 4 lane HRBT tunnel will s
The Chesapeake Bay Bridge Tunnel, shown in a 2000 file photo. (Steve Earley Virginian-Pilot file photo) View full-size photo Buy Pilot photos RELATED Meetings set on Bay Bridge-Tunnel toll increase - Jul. 18 Bay Bridge-Tunnel moves toward higher toll, expansion - May. 31 Chesapeake Bay Bridge-Tunnel to offer big discount - Feb. 13
The Hampton Roads Connector Partners (HRCP) is hereby authorized under section 101(a)(5)(D) of the Marine Mammal Protection Act (MMPA; 16 U.S.C. 1371(a)(5)(D)) to harass marine mammals incidental to the Hampton Roads Bridge-Tunnel (HRBT) Expansion Project, Hampton-Norfolk, Virginia
Hampton Roads Transit (HRT). This budget reflects 17.5 million in operating revenues, 83.0 million in non-operating revenues, and 100.5 million in expenses. We trust you will find this document informative and useful. HRT's mission is to connect Hampton Roads through high quality, safe, efficient, and sustainable transportation services.
Hampton Roads as either excellent or good, while 46 percent rated economic conditions as fair or poor. This portion rating the regional economy as excellent or good was the highest in 2015 and only decreased slightly this year. Life in Hampton Roads is not without its challenges and Hampton Roads residents continue to have
Roads in Malaysia are classified into two broad categories, namely Federal Roads and State Roads. 2.1 Federal Roads Federal roads are all roads declared under the Federal Roads Ordinace (1959) and the major interurban roads joining the state capitals and roads leading to points of entry to and exit from the country.
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