2013

Project Partners

Dewberry

Description

As a sub-consultant to Dewberry, MP Engineers (MP) provided inspections, design services, construction plans, specifications, cost estimates, and construction support services for two bridge superstructure replacements on the Garden State Parkway. The improvements consisted of demolition of three existing main lane line superstructures and reconfiguring them to one lane exit ramps. The existing structures were heavily skewed, four simple span bridges with multi-column pier bents and stub abutments. The proposed structures consisted of two simple spans and two continuous spans in an effort to eliminate the number of deck joints. This superstructure replacement also required a design of wider pier caps and bridge seats along with reconstructing portions of the abutments and implementing Mechanically Stabilized Earth wing walls. MPE coordinated MPT patterns with the staging of new bridge structures. Bridge design included different staging plans that maintained traffic in three lanes in each direction of the main line and single-lane traffic on existing ramps at all time. MPE designed a new bridge deck profile, cross-slope, curb, and sidewalk as per NJTA and AASHTO standards. Highway drainage was designed as per NJTA standards. A full seismic analysis of the existing substructure was conducted and a load rating report was prepared. Included in the prepared drawings were demolition plans and construction staging for both the substructures and superstructures construction. The design also required a developed girder arrangement that overcomes obstacles that arise when dealing with a curved bridge, large skew and continuous spans. MPE prepared final design drawings for ADP and PS&E submission. Project estimates were prepared utilizing RSMeans system. The estimates were updated every three months throughout the duration of the project. MPE also provided construction support services, responded to RFIs and reviewed shop drawings.