HBM-IL 120 over Greenleaf Ave. Dual Bridge

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.