Scope of Project:
The project consisted of various foundation and shoring systems, roadway improvements, and a pedestrian walkway along 10th Street and Duquesne Boulevard. Brayman designed and constructed a pair of 500 foot long walls consisting of 48” diameter tangent pipe piles, driven to depths of 55 feet, supporting a 20 foot deep excavation for the new pedestrian walkway. This retaining wall system was a cost savings alternative to using the as-designed reinforced concrete caisson walls.
Brayman also redesigned the bridge foundation system and installed 9” diameter micropiles where limited vibrations were allowed. Four 150 ton load tests were successfully performed on these micropiles. Significant shoring was required in order to excavate for the new bridge abutments and to support the complex lateral loading conditions from the adjacent building caissons.
Yet another specialty foundation requirement was to provide excavation support for construction of a new pump room with only 22’ of available headroom. The shoring system utilized 9” diameter drilled micropiles, which were reinforced with an inner 7” OD pipe, as well as timber lagging, and an extensive waler and bracing system.
Brayman’s value engineered retaining wall alternative saved $1 million and reduced this fast-track construction project schedule by 2 months. |
