Uni-Systems Engineering, Inc.


Completed 2006

Location: Glendale, Arizona

Scope of Work: Design, Supply, Installation

Project Client: Hunt Construction


Architect: HOK Sport and Peter Eisenman

General Contractor: Hunt Construction Group

Structural Engineer: Walter P Moore

University of Phoenix Stadium is one of the busiest multi-purpose facilities in the country, with events scheduled most days of the year. The retractable field is a key factor in the facility's quick conversions between events. The field normally resides outdoors, on the south side of the facility where conditions for maintaining its natural grass playing surface are optimal. Inside the stadium, a clean, flat, well-positioned floor is exposed, ready for trade shows, concerts, and other events. On game days, the grass field is driven approximately 500 feet into the stadium in approximately on hour, and it's ready for action.

The staff of Uni-Systems Engineering designed, supplied, and installed the electro-mechanical drive system for the University of Phoenix Stadium retractable field. The 234-foot wide by 403-foot long field is 40 inches tall, weights 19 million pounds, and supports 2.2 acres of grass. The field has 542 wheel assemblies that roll along 13 steel rails embedded in the concrete floor. Seventy six of the wheels are driven by 1-horsepower electric motors, and the 42 wheels on the center rail are equipped with guide rollers to maintain the retractable field's position during movement.

Uni-Systems Engineering staff also designed, supplied, and installed the University of Phoenix Stadium retractable roof as well as powered truck, personnel, and field access doors at the south end of the stadium.

The operation and maintenance manual was awarded Distinguished and Best in Show Awards: Technical Publications for International Competition Society of Technical Communications (STC) in 2007.

University of Phoenix Stadium

Retractable Field