Abstract
Excavation for the PPG Headquarters complex in Pittsburgh, Pa. was critical because the site is adjacent to three historically important buildings. Soil nailing, a method of in situ earth reinforcement, was used at these three areas. One method, which had been tested at the University of California, involves use of shotcrete and wire mesh to support the excavation face with reinforcing members grouted into the soil mass behind the face. This, however, was not satisfactory for the Pittsburgh site, so a modified method was used. Columns were drilled, pressure grouted and reinforced; then the reinforcing nails were drilled and pressure grouted. No movement of the three buildings was detected during excavation and construction of the new buildings.
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