seattle’s problem: replacing the viaducts3images.coroflot.com/user_files/individual_files/... ·...
TRANSCRIPT
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Seattle’s Problem: Replacing the Viaduct
As we all know, the Viaduct must eventually be torn down.
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There have been three proposals to deal with
this problem
• Build a new Viaduct• Build a tunnel• Replace the Viaduct with a surface road
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Two of these methods are very costly.
• Costly Construction by 2009– Viaduct replacement: $3.0 Billion– Tunnel-Bulkhead: $4.9 Billion
• Costly Disruption– Waterfront commerce shut down
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And the surface road option?
• doesn’t make any sense for traffic flow
• doesn’t make any sense for commerce
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We submit that there is another way to replace the
Viaduct
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The benefits of this method include
• Affordable Construction: $3.8 Billion*
• Very little downtown disruption
• Arterial flow maintained throughout the project
• No land acquisition required
*Based on current FST modular type construction methods from 1993 European source data. Data extrapolated to present day Washington State costs.
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Engineering criteria, and technology have
been developed
• There are several ongoing engineering projects, and there are construction projects using this technology.
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A proposal
We propose that the FHWA, WSDOT, and the City of Seattle, jointly fund an engineering
and cost feasibility study based on the following concept.
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The ELLIOT BAY
SUBMERGED FLOATING TUNNEL
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Like a floating bridge
The ELLIOT BAYSUBMERGED
FLOATING TUNNEL (EBSFT) is
anchored to the bottom.
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Unlike a floating bridge
EBSFT is protected from storms
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Like a tunnel
EBSFT uses traditional tunnel ventilation methods
South entranceventilation and
service structure
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Unlike a tunnel
EBSFT requires minimal digging and commercial disruption.
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Like a traditional suspension bridge
EBSFT issuspended.(off of the bottom)
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Unlike a traditional suspension bridge
EBSFT is in an environment
where loads are substantially
less than bridges.
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In this example we propose building the EBSFT using plastic composite methods
• Not like modular construction STF approach used to date.
• Flexible mono-structure– eliminates joints under water– can be towed into place– flexible enough to handle underwater and seismic
stresses – recycled flotation and ballast components can be
used
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Step1
• Build a facility on the northern tip of Harbor Island
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Step 2
• Weave cables, or other appropriate materials to create flexible tube tunnel structures.
• These tunnel structures are coated and covered with a flexible composite.
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Step 3
• Install deck beams. These beams act as foundation for the road beds.
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Step 4
• Add additional structural components• Build a composite filler with integral structural
flotation and ballast. (This filler connects the tunnels)
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Step 5
• As EBSFT is constructed, it is flooded and towed into place with tugs.
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Step 6
• EBSFT is anchored to the bottom and supplied with enough positive buoyancy to support the weight of traffic
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EBSFT cross section
South boundBallast tanks,bilges and pumps
Service and ventilation
Bilges
Integral composite flotationNorth bound
Integral composite ballast
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More Commerce
Other submerged floating tunnels could be produced at the Harbor
Island facility, and be towed to site.
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EBSFT Placement Options
EBSFT starts at Harbor Island
It could startat other
locations too
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Recap
• The benefits of Submerged Floating Tunnel Technology in Seattle– Affordable– Very little downtown disruption– Arterial flow maintained – No land acquisition required– New industry for the region
• The technology is ready and waiting
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We Request that the FHWA, WSDOT, and
the City of Seattle
jointly fund an engineering and cost feasibility study for the
ELLIOT BAY SUBMERGED FLOATING TUNNEL
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Source Documents
• http://www.fehrl.org/?m=32&id_directory=58– including: Forum of European National Highway Research
Laboratories Analysis of the submerged floating tunnel concept, Transport Research Laboratory Crowthorne, Berkshire, RG45 6AU, 1996 p10
• http://www.wsdot.wa.gov/BIZ/CONSTRUCTION/CostIndex/CostIndexPd f/constructioncosts.pdf
• http://seattlepi.nwsource.com/transportation/285955_viaduct21.html• http://www.fhwa.dot.gov/bridge/frp/frp1298.cfm• http://www.jeico.co.kr/cnc57ec1.html• http://www.wsdot.wa.gov/Projects/SR520Bridge/Photos/Damage.htm• http://testcf.wsdot.wa.gov/projects/sr16narrowsbridge/photolibrary/19
40/enlarged/?image=1940_2.jpg&description=desc2.htm• http://www.fhwa.dot.gov/bigdig.htm
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EBSFT
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Sometimes ideas just need to get out there!
Art & Invention focuses on creative consultancy and mechanical product development.Contact: Mark Adams, [email protected]
P.O. Box 11278 Bainbridge Island, WA 98110
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EBSFT
THANK YOU