Once the loads were transferred from the masonry walls, those old structures were removed and the new moment-resisting frame system was installed. The moment-resisting frame system—composed of UC356x406 columns and UB356x406 beams with bolted moment-resisting connections—was supported on the hotel’s second-floor masonry walls.
A second series of hydraulic jacks were located atop the moment-resisting frame system; when these jacks were pressurized, the loads of the trusses were transferred from the temporary towers to the permanent moment-resisting frame system, the temporary towers were dismantled, and the façade was lowered back to its original position. During jacking, jack loads, pressures and jack strokes had to be carefully and continuously monitored, with loads being increased incrementally to a final value of the order of 350 tonnes.
Although the original steel hangers that connect the façade to the trusses exhibited signs of corrosion, a survey of the 1910 steelwork satisfied the design team that the hangers were still able to support the façade and thus they were simply repaired and repainted to prevent further damage.
As each half of the façade was raised and lowered, gauges monitored the deflection of the trusses and a series of 30 or so survey prisms were temporarily attached to the exterior of the façade so that any movement could be monitored in three-dimensions via infrared surveying devices. Movement of the façade was limited to 1 mm in any direction.
Considerable steelwork around the perimeter of The Savoy’s basement was replaced due to water-related corrosion and new galvanized steel was installed to prevent further corrosion damage. Existing elevators were refurbished and additional elevators were installed providing access to all floors. A large ornate steel and glass cupola was installed in the ceiling of the River Restaurant to bring light from the inner courtyard into the hotel.