During construction of the Miami Children's Hospital, Keller used multiple techniques while controlling construction disturbance to hospital operations, staff, and patients.
Construction of a six-story, 48,000 ft2 critical-care bed tower directly adjacent to an existing, operational critical-care facility required proactive mitigation measures to avoid impacting the operating facility.
The existing wing required underpinning in low headroom conditions prior to construction of the new tower. Limited as-built information, overhead constraints, underground utilities, and restricted working conditions further complicated the scope of work. Faced with a fast-paced schedule and multiple contractors working in a small site, Keller designed a constructible and safe solution using jet grouting and permeation grouting.
Keller conducted permeation grouting beneath the existing slab to stabilize the soils prior to excavation. Due to the geotechnical conditions, a sodium-silicate grout was selected as the grouting material. Afterwards, an excavation support wall was constructed using vertical and battered jet grouted columns. A real-time data acquisition (DAQ) system was employed to display and record jet grouting parameters during construction, allowing engineers to verify the quality of construction.