Statistics: Suspended Slab 680,000 sf. Columns 2,342 ea. Shear, Stair & Elevator Walls 236,000 csf.
Client:
Nordic / PCL Joint Venture MCC Project Manager:
Chris Moes MCC Project Engineer:
Chris Moes, Ben Sugiyama MCC Superintendent:
Chris Moes, Ben Sugiyama
Office Buildings / Structural Frames
Example: Job # 383 - Gap World Headquarters, San Francisco, CA
Project Description:
The GAP Headquarters building is comprised of 160,000 square feet of below grade parking and 19 levels of office space above grade. The perimeter walls of the basement area is constructed of shotcrete against a steel pile-wood lagging retention system.
Portions of the foundation are below the water level of the San Francisco Bay directly across the embarcadero from the project site. The foundations were saw cut through a rat slab, dug neat and a temporary retention system was installed to hold back the differing soils encountered during structural the excavation. During structural excavation numerous old wood piers were encounter, which were either removed or cut off to facilitate the foundation system.
The lower parking garage levels consisted of perimeter shotcrete walls, interior columns and shear walls supporting an 8” to 10” thick suspended slab with capitals.
The major portion of the project was the cast-in-place elevator core which started from a large mat foundation in the center of the site. Due to schedule and hoisting constraints it was necessary to form the core utilizing a self-climbing wall forming system. The system that was used for this project was designed using steel form panels attached to a self-climbing electric screw jacking system. This method allowed the entire forming system to be raised at one time without the use of the project tower crane.
The 10” structural slabs in between the core walls were delayed and cast later to minimize their impact on the critical path schedule items.
In addition to the core walls and basement areas, numerous planter walls and curbs were constructed throughout the project.
To combine the structural concrete core with the structural steel elements it was necessary to install numerous steel embeds to facilitate the connection between the two systems.
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