INSIDE/OUT ISSUE 45
SPRING
NEWSLETTER
APRIL 2012
Overcoming Challenges for a Seismically Sound Structure Modernizing a facility that is more than 90 years old will inevitably pose challenges. The upgrade of Berth 10 at the Port of Cristobal in the Republic of Panama certainly met the criteria of a challenging project. Dealing with the existing poor ground conditions complicated the project and was one of the bigger obstacles in developing this successful project, and working on a very busy terminal in a very constrained area The Berth 10 project upgraded the existing 90-year-old berth structure to permit the berthing of postpresented additional issues. Completed Panamax vessels and the usage of post-Panamax rail-mounted quay cranes. in summer 2011, this design/build The upgrade was also essential because the Port of effort on which BergerABAM teamed Cristobal is a growing container trans-shipping center. The with Intercoastal Marine, Inc., (IMI) involved the upgrade BergerABAM and IMI team strove to keep the project on of an existing 130-meter-long berth and a 240-meter-long schedule by developing innovative and rapid construction extension for rail-mounted, post-Panamax container crane techniques, but the ground conditions at the site posed operations. For those not familiar with the term, posta significant risk to all aspects of the project. Existing Panamax refers to ships that do not fall within size limits geotechnical information and additional investigations for passage through the Panama Canal. Size limits and confirmed a deep layer of loose sandy soils that were requirements for ships traversing the Panama Canal are susceptible to liquefaction during an earthquake. As with based on the Canal’s width and depth; however, this will any modernization project, seismic design is important, but change with the completion of the new third locks project at it was even more so on this project because the soft, loose, the Canal in 2015. sandy layer of soil was unstable under even a moderatelevel earthquake. Liquefaction would have devastating The upgrade of Berth 10 was imperative because modern results. A moderate seismic event could produce lateral berths require high-speed, rail-mounted, ship-to-shore spreading and slope failures at the berth structures and container cranes to efficiently load and unload ships. (continued on page 2)
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