One Washington Square

One Washington Square

One Washington Square

  • Design and installation of needle beam shoring system
  • Below grade waterproofing
  • Structural steel replacement
  • Location: Philadelphia, PA
  • Specialty Contractor: PULLMAN

One Washington Square, a historic high-rise building in downtown Philadelphia, needed a permanent solution to stop water infiltration in its basement. This issue lead to damage of structural steel beams and the surrounding slab.

PULLMAN, a licensee of STRUCTURAL TECHNOLOGIES’ products and technical support services, formed a design-build team to provide the most effective means of solving the structure’s issues. There were numerous penetrations in the slab varying in size, including two four-foot diameter openings. To address this damage, the penetrations were filled with hydraulic cement and then waterproofed.

An interior investigation also discovered corrosion on three structural beams that supported the façade above. This required the design and installation of a needle beam shoring system to support the façade during the structural repairs.

Access to the structural beams in the basement was challenging, requiring a custom decking system to be erected over the switch gears and transformers to allow for a safe working environment. Once all structural repairs were completed, below grade waterproofing was successfully installed to prevent any further water infiltration.

Through value-engineering, creative thinking and teamwork, the renovations made to the One Washington Square basement were completed on time. The team’s collaborative approach beginning with the investigation and unique ability to perform numerous specialty construction and restoration services led to the successful completion of this project.