Fort (M-85) Street Bascule Bridge

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Brian Newman
5 years ago
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1 Fort (M-) Street Bascule Bridge

2 DESIGN Overview History Geotech/Substructures Superstructure Aesthetics CONSTRUCTION Steel and Machinery Fabrication Existing Bridge Removal Road Reconstruction Bridge Replacement Leaf Launch QUESTIONS/LESSONS LEARNED

3 Rouge River

4 Overview Existing Bridge, 0 Years Old Extensive Deterioration End of Useful Life

5 History Rouge River enlarged in 0- for Ford River Rouge Plant Dredged X Depth & X Width Destabilized Bridge Subpiers

6 Double-Leaf Bascule Lanes of Traffic Trolley Lines - Sidewalks Feet Betw. Trunnions Feet Overall Foot Wide Channel, Reduced to Feet

7 0- Dredging Bascule Piers - Wide - Long Feet below Water Line Abutments Timber Piles Feet Long or fetch up on hard pan -foot Channel

8 Construction Challenges Utiltiy Tunnels -0 Michcon Gas Tunnel - Detroit Edison Tunnel

9 Pier Foundations Four -Foot Square Caissons Intent Foot Into Hardpan Terminated above Hardpan or Rock No Documentation of: Hydrogen Sulfide Gas Artesian Water

10 Things To Consider: Effects of Large Fill Areas Major Dredging Appropriate Geotechnical Investigation

New Bridge Requirements Provide -ft navigation Channel Accomodate traffic Lanes & Pedestrian/Bikeways Minimize ROW Impacts Avoid Tunnels and

11 New Bridge Requirements Provide -ft navigation Channel Accomodate traffic Lanes & Pedestrian/Bikeways Minimize ROW Impacts Avoid Tunnels and Existing Subpiers Provide a Striking Visual Enhancement to the Community Result: An -ft Wide, -ft Rolling-Lift Bascule with an Overhead Counterweight

12 00 Alignment Option Realign Fort Street Pros: Fort is Primary Movement At Oakwood Intersection Cons: Very High ROW Costs

13 00 Alignment Option Retain Existing Alignment Pros: Minimal ROW Costs Cons: Oakwood Fort St. Fort St. Oakwood is Primary Movement At Oakwood Intersection Accommodate Tunnels and Existing Subpiers

14 0 Global Stability Factor of Safety = 0. to (Assuming No Resisting Force from Bridge)

15 0 Geotechnical Investigation Use Pile Supported Concrete Slab to Support Fill, Road, Live Load Ft. Wide by Ft. Long by Ft. Thick Supported by Steel Piles HP X Determined to be Most Efficient Method to Achieve F.S. of.

16 New Single-Leaf Rolling-Lift Bascule -Ft Span (-Ft Channel) -Ft Wide -Ft Deep Half-Through Trusses Five -Ft Traffic Lanes Two -Ft Sidewalks Rolling Dead Load Total Dead Load Rolling Moment Wind Moment Half-Filled Steel Grid Deck with -Inch Overpour Stringers at about - Centers Floorbeams at - Centers Total Leaf Weight is Million lbs -,000 Kips -,00 Kips - -,000 Ft-Kips to +,000 Ft-Kips - -,000 Ft-Kips to +,000 Ft-Kips

17 Bascule Pier Foundation Options Large Diameter Drilled Shafts - Limited Locations - Artesian Water - High Costs Steel Piles Driven to Rock HP X 0 - Minimal Individual Footprints - Large Capacity Per Pile - Cost Effective

18 Steel Piles HP x 0

19 Bascule Pier Foundation Piles: HP x 0 Fenders: HP x Fender Whaler: W X

20 Deck Steel Grid with pcf Lightweight Concrete Half-fill and over-fill 0

21 Walkway Deck Steel Plate with Thermal Spray Slip Resistant Surface, Galvanized

22 Superstructure Single-Leaf Bascule Rolling-Lift, Most Efficient Shortest Span for Channel Reduced Area for Wind & Ice Reduced Friction During Operation

23 Two Steel Pony Trusses Feet Deep Feet Long

24 Chords: x 0 Welded Boxes Web Members: W-Shapes & -Plate Weldments Jeff Victor

25 Segmental Girders Web: x Top Flange: x Bottom Flange: ½ x Yield Strength: 0 ksi

26 Tread & Track Castings High Strength I-Shape Steel Castings 0 Wide x Deep Yield Strength: ksi Shear Lugs: ⅝ x Tread Radius: - ½ Length of Travel: -

27 Track Castings Shear Lugs spaced at Center-to-Center Thick Web