Rehabilitation of the Red Bank Road Bridge over Hoover Reservoir. Presented By: Doug Stachler, P.E.

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1 Rehabilitation of the Red Bank Road Bridge over Hoover Reservoir Presented By: Doug Stachler, P.E.

2 Project Organization Owner Delaware County Engineers Office Design Consultant CH2M HILL Contractor Double Z Construction Geotechnical Subconsultant BBC&M Survey Subconsultant Canter Surveying

3 Project Background Bridge carries local traffic over Hoover Reservoir Recreational boat waterway Drinking water source for the City of Columbus Popular Bicycle Route

4 Project Background Existing Bridge Built in 1954 Total Bridge Length = 182 Bridge Width = 26-0 (f/f barrier) 3-Span Steel Rolled Beam Bridge Standard Jointed Type Abutments Located within limits of 1200-foot sag vertical curve

5 Purpose of Project Deterioration of Bridge Deck & Steel Beams

6 Purpose of Project Deterioration of Concrete Curbs & Steel Railing

7 Purpose of Project Steel Railing Anchored into Concrete Curb Anchorage for the Bridge Railing is IMPORTANT

8 Purpose of Project Deterioration of Abutment Backwalls

9 Factors Attributed to Bridge Deterioration 55 Years of Ohio Winters Low Point of Sag Vertical Curve Located on Bridge Over-the-deck Drainage

10 Project Goals Replace existing bridge deck and rolled beams Convert existing jointed type abutment to semiintegral type Remove abutment backwall but patch and reuse existing abutment pile cap

11 Project Goals Provide a new bridge deck with increased width Meet current roadway design standards Provide additional safety for bicyclists

12 Project Goals Reuse as much of existing piers as possible

13 Project Goals Modify roadway profile to shift low point of sag vertical curve off of the bridge Location of Low Point on Existing Profile

14 Project Goals Keep all proposed work above the Ordinary High Water Mark (OHWM) to avoid necessary permits with the Army Corps of Engineers

15 Project Approach Traditional Bridge Design Process Red Bank Bridge Design Process Design Superstructure Design Superstructure Design Substructure NO Is Existing Substructure Design Sufficient? YES Design Foundation NO Is Existing Foundation Design Sufficient? YES Design Complete Design Complete

16 Superstructure Replacement Original Bridge New Bridge Steel Rolled Beams Size Fy Spacing W33x ksi 7-4 W33x ksi 8-8 Bridge Deck F/F Curb or Barrier Overhang Total Superstructure Depth ½ ¾ Over-the-deck drainage system with steel tube railing allows the total out-to-out deck dimension to match the face-to-face barrier dimension Use Steel Drip Strip rather than Concrete Curb and Gutter Increase design live load to HS-25 & design for 60 psf FWS New superstructure is composite design

17 Modified Twin Steel Tube Railing

18 Pier Design Increased bridge deck width required the existing pier caps to be replaced and widened Pier cap cantilever increased by 21 Pier cap depth increased by approximately 6

19 Pier Design Developed a structural model of existing pier columns and existing pier footing Structural properties of existing pier members was based on original construction plans Geotechnical investigations performed to verify existing footing elevations and soil bearing capacity for existing footings Finite element analysis confirmed capacity of existing spread footings

20 Abutment Design Existing deteriorated backwalls were removed and replaced with semi-integral integral abutment diaphragm Top portion of existing abutment beam seats, and existing wingwalls were removed and replaced

21 Abutment Design Abutment pile cap was widened and 4 new piles were added to accommodate the widened superstructure

22 Roadway Profile Adjustment New pier caps and new abutment seats easily allowed for adjustments to roadway profile. Sag vertical curve was slightly adjusted to relocate the low point of the sag to just beyond the forward approach slab Allowed for runoff to be collected into a catch basin rather than over the side of the structure Although over-the-side runoff still exists

23 Manage Runoff Water Quality Worked with City of Columbus Watershed Department and recommended ODOT approved BMP s Low cost exfiltration trenches used on curbed bridge approaches to minimize contaminant- laden runoff to protect the water quality in the reservoir

24 Challenges During Construction Special care had to be taken to keep all construction debris, stormwater runoff, and hazardous chemicals out of the reservoir Demolished the existing deck by sawing deck into small slabs that could be removed with hydraulic excavators Beams were also cut into short sections and then removed Existing overlay was left on the deck surface to prevent the slab from breaking up under the weight of the demo equipment Pier false-work was designed to accommodate both the removal of the pier caps and for supporting the new pier caps

25 Project Cost Federal Funding Secured = $1,426,440 Final Engineer Cost Estimate = $965,000 Contract Award = $914,357 6 bids received Competitive and tightly clustered bids Throughout construction there were no design-related change orders and the overall project was under the contract amount

26 Project Complete

27 Summary Improved the safety for travelling public Repaired existing deterioration while at the same time, provided remedies to help mitigate future deterioration to new bridge Reused as much of existing bridge as possible to make project cost-effective All done while being conscientious about maintaining water quality in the reservoir