HBM-IL 120 over Greenleaf Ave. Dual Bridge
Lake County/ FAP Route 342 (IL 120)
District I Structural Engineering Services
Illinois Department of Transportation
Contact: Ms. Helen Pazon 201 West Center Court, Schaumburg, IL 60196 /(847) 705-4523
Key Team Members
Moussa A. Issa, Project Manager Mahmoud A. Issa, Project Engineer Lisa Buntin, Rating Engineer John Saraceno, Structures Engineer
Description of Project
The HBM scope of improvements included the Phase II engineering services as described below:
- Review existing Phase I Documents including Bridge Condition Report (BCR), Project Report, Hydraulic Report and Drainage Report.
- Preparation of Type, Size and Location (TS&L) Plans
- Structural Analysis; Design; Structural Final Plans
- Specifications and special provisions, quantity calculations
- Phase III construction support
- Quality Assurance / Quality Control (QA/QC)
The existing dual bridge (WB SN 049-0125 and EB SN 049-0126) consists of two structures carrying three lanes of eastbound and three lanes of westbound IL Route 120 traffic over Greenleaf Avenue. The existing dual structures are four-span (37′-4″, 67′-4″, 67′-4″ and 34′-3″) bridges with a reinforced concrete deck on steel beams. The fascia beams supporting the deck and all interior beams for spans 2 and 3 are steel W36 sections. The interior beams for span 1 are steel W33 sections. The interior beams for span 4 are steel W30 sections. The reinforced concretedeck is 8″ thick in addition to a 2″ bituminous concrete overlay which was placed in 2000. Spans 1 and 4 are simply-supported, non-composite spans. Spans 2 and 3 are continuous, composite spans. S.N. 049-0125 (WB) measures (210′-9″ back-to-back of abutments) with an out-to-out width varying from 54′-9 1/2″ to 58′-11 3/8″. S.N. 049-0126 (EB) measures 210′-9″ (back-to-back of abutments) with an out-to-out constant width of 58′-0″. Both structures were built on a 1°20’17” skew angle. The substructures consistof open stub abutments founded on two staggered lines of circular concrete piles. Piers 1 & 2 for both structures and Pier 3 for S.N. 049-0125 (WB) are founded on two lines of circular concrete piles, while Pier 3 for S.N. 049-0126 (EB) is founded on spread footing only.
The bridge rehabilitation included the following:
- Complete removal and replacement of the existing bridge deck structure with an 8” thick deck and Type F parapets
- Removal and replacement of the existing expansion bearings at the abutments and expansion and fixed bearings at Piers 1 and 3 with Type I elastomeric bearing assemblies with fabricated steel extension to reach the desired elevation through a beam jacking operation after removal of the existing deck.
- Making the new deck composite at the positive moment regions by adding shear studs to all existing beams where not already installed.
- The framing of the bridge was not adjusted; thus, four expansion joints were still required. The type of expansion joint was changed to preformed joint strip seal from the silicone sealant that was previously used.
- Design calculations were performed on the existing structural steel beams to confirm their adequacy under new loads and moment and reaction tables were added in the plans.
- Installation of a new drainage system.
- Rehabilitation for the existing abutments and piers using structural repair of concrete and epoxy crack sealing.
- Removal and replacement of the abutment backwalls and top portions of all abutment wingwalls.
- Removal and replacement of bridge approach pavements.
- Removal and replacement of existing slopewalls for both structures and the portions in between both structures.