- Category: Foundation Systems, Underground Storage Tanks (UST) Installations
- Underground Storage Tank Installations : Installation of rectangular cofferdam. Picture shown is for a 86' x 16' x 16' deep cofferdam for (2) – 20,000 gallon tanks end to end.
NSI team has completed over 1,000 cofferdams for UST installations. Each installation requires construction of a bracing frame template to guide the sheet insertion and act as bracing. Steel bracing beams serve two purposes. They act as guides for sheet pile installation and then as bracing to keep the sheet piles in place once the excavation is complete. Then sheets are driven partially to form the coffer. The sheet piles are then driven to project depth. Each project varies in complexity and engineering detail.