• Ground Improvement
• Illinois DOT
• Hazelwood Schools
• Wentzville
• West Memphis
• St. Peters Rec Plex
• Sheboygan Police Station
• Lange-Stegman
• Kennett
• Bluffton Ethanol
• Wheeler Center
• Earth Retention
• Metrolink
• Warrenton Copper
• MoDot
• Centrum Properties
• Pinnacle Tunnel
• Metropolitan Sewer
• Drilled Shafts
• Pinnacle Casino
• Eads Bridge
• Driven Pile
• MCI WorldCom
• Ameren UE
• Augercast
• Proctor & Gamble
• Micropile
• St. Louis Zoo
• Cupples Station

Service: Earth Retention for Cut and Cover Tunnel
In order to install a pedestrian walkway that would connect downtown and the Edward Jones Dome to Laclede’s Landing and the Pinnacle Casino, a cut and cover tunnel was required to allow installation underneath the MLK bridge off ramp, Interstate 70, and 4th Street. Subsurface Constructors was contacted to provide a design-build solution. In order to limit schedule time on a project that could be very disruptive to heavy urban traffic, Subsurface designed a cantilevered system that would save tie back installation time and better facilitate a faster installation.

The tunnel length is approximately 440 feet and the excavation depth has a maximum depth of 30 feet. The plans call for 225 cantilevered soldier beams, some of which required splicing over the drilled shaft due to Interstate 70 overhead. Additionally, Subsurface installed drilled shafts to support temporary bridges upon which traffic will flow while the system is excavated and lagged to subgrade. Subsurface will install an electronic monitoring system to track the performance of the shoring system.

• Owner: Pinnacle Casino
• General Contractor: McCarthy Corporation
• Geotechnical Engineer: Geotechnology, Inc.
• Earth Retention Design/Builder: Subsurface Constructors, Inc.
• Equipment: Watson 3100, IMT AF-12