Old Wheeler Lane Bridge
AI provided design and construction inspection services for the rehabilitation of the bridge carrying Old Wheeler Lane over Roaring Brook in the Town of Avon.
The existing 55-year-old structure was found to be structurally deficient and scour critical. The existing concrete beam superstructure was in poor condition and needed to be replaced. The substructure of the bridge was in good condition and worthy of preservation. However, the abutments and wing walls were founded on relatively shallow spread footings that were susceptible to undermining due to the effects of riverbed scour.
The new structure is made up of eight interior post-tensioned prestressed concrete deck units and two similar exterior beams with block-outs between the interior and exterior deck units to accommodate utility installation. New concrete sidewalks and end walls are incorporated into the superstructure, and a new wooden guide rail system was installed at all four corners of the bridge to improve aesthetics.
A Level 2 scour analysis was performed, and it was concluded that scour countermeasures were required for the stability of the structure. Scour mitigation was achieved by removal of 4 feet of riverbed material and installation of 3 feet of standard riprap on 1 foot of gravel fill. A geo-synthetic membrane was installed below the gravel fill. Native streambed material was placed on top of the riprap to replicate the pre-construction natural condition for restoration of native plant and wildlife species.
Old Wheeler Lane was closed to thru traffic during construction allowing the contractor unimpeded access to the bridge, thus minimizing construction duration and cost. The channel work was performed in two stages, utilizing temporary water handling measures to maintain stream flow.
Due to the proximity of the Roaring Brook Elementary School, construction activities proceeded on an accelerated schedule during the summer months while the school was out of session. All major construction was completed in just 10 weeks, and the road was reopened to traffic before the start of the school year.
- Bridge design
- Hydraulic & hydrologic analysis
- Scour analysis
- Cost estimate
- Construction inspection