Northeast
MBTA Lynn Commuter Rail Station
SGH led a multidisciplinary team to evaluate the condition of the facilities at the Massachusetts Bay Transportation Authority (MBTA) Lynn commuter rail station and recommended repairs.
Newton-Weston, MA
Riverside Park Pedestrian Bridge No. P34
Scope/Solutions
The bridge carries a pathway over the Charles River in Riverside Park, which is operated and maintained by the Department of Conservation and Recreation (DCR). SGH assessed the condition of the circa 1915 pony-truss bridge and was the engineer of record for the rehabilitation.
Our investigation included visual observations, structural analyses, and a scour evaluation, completed in collaboration with a geotechnical subconsultant.
Scour had damaged the west granite fieldstone abutment and we recommended closing the bridge until this abutment could be repaired. Since the east abutment showed no signs of scour or damage and had a proven history of good performance, we designed a new ashlar-granite-clad concrete structure for the new west abutment and retained the existing east abutment. Our rehabilitation design also included refurbishing the riveted steel superstructure and replacing deteriorated wood decking.
SGH worked with the contractor to develop construction sequencing for lifting the superstructure in one piece off its existing abutments, placing it in the adjacent park during rehabilitation of the superstructure, and resetting the rehabilitated structure back on the new west abutment and existing east abutment.
The engineering and construction team successfully completed the project as a MassDOT-Highway Accelerated Bridge Program project, in cooperation with DCR.
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Project Summary
2013
Completion Date
1M
Construction Value
Solutions
Repair & Rehabilitation
Services
Structures
Markets
Infrastructure & Transportation
Client(s)
Commonwealth of Massachusetts Department of Conservation and Recreation | Massachusetts Department of Transportation
Specialized Capabilities
Repair & Strengthening | Marine & Civil Works | Geotechnical
Key team members
Additional Projects
Northeast
MBTA Sullivan Square Station
SGH performed a structural safety evaluation, designed canopy and platform repairs, directed a multidisciplinary team in the design of station brightening options, and performed construction phase services during an on-call contract.