Drilling first tier tiebacks Shoring Installation Initially, soldier pile installation by drilling was specified due to concern over vibrations. Schnabel proposed driving soldier piles using a variable moment hammer to limit installation vibrations. The design team, including design consultants for the House of the Temple, permitted all 115 soldier piles to be driven with real-time continuous vibration monitoring performed at all adjacent buildings. At the House of the Temple, vibrations were minimal with readings of 0.01-0.05 in/sec (0.25-1.27 mm/sec) recorded at distances of 50100 ft (15-30 m) from the soldier pile operation. The vibrations peaked at the c a r r i a g e hous e and Campbe l l townhouse structures while the soldier piles were penetrating a stiff layer of soil. During these peaks in vibration, the existing cracks on the structures were monitored in real time. Installation proceeded while closely observing the penetration rate of the pile and the existing conditions of the structures. Schnabel allowed piles that hit refusal Piles hit refusal at 35 ft (10.5m) Piles driven to final depth DEEP FOUNDATIONS * MAR/APR 2023 * 75