Phoenix Project #2010
This project required the installation of 25 permanent tiebacks to support the newly install bulkhead at the Hy-Line Cruise Terminal. Anchors consisted of 40-foot long double corrosion protected (DCP) thread bar anchors with hot-dipped galvanized bearing plates, trumpets, and hardware for each anchor.
All tieback installations and testing were performed from atop floating work barges positioned along the newly installed bulkhead. Performing work safety on marine projects requires care planning and review of site logistics. Further, considerations for the changing tides need to be factored in during installation as adjustments to the work platform are continually made throughout the day. Paying close attention to the installation angle and constantly adjusting it with the tides is critical.
A geotechnical condition known as “running sands” was another major obstacle experience during anchor installations. A running sand condition can occur when drilling through sand layers beneath the water table, and results in sand constantly blowing back up into the drill casing. The solution for this project was the use of a drilling polymer which helped to stabilize the drill hole and maintain enough head pressure to prevent the sand from running into the casing.
Despite all of the geotechnical and logistical challenges faced, all anchors were successfully installed, tested, and locked off in a timely manner.