On January 22, 2003, the Port of Manzanillo, Mexico, felt the shock wave from the 7.8 magnitude earthquake centered at Colima 50 kilometers to the east. This caused a 75-mm misalignment of the adjacent OPI and SSA berths. The misalignment was at the expansion joint between the berths and distorted the crane rails so the two SSA cranes, which were parked on the OPI berth, were stranded.
Liftech designed a remodel to a 1,500-foot container wharf for the Port of Oakland at Berths 32/33 and a new 250-foot wharf extension to Berth 30. This $20 million construction project allows 100-foot rail span container cranes to travel from the Berth 30 wharf to the Berths 32/33 wharf. In addition, sheet piling was installed at the toe of the embankment to allow the berth to be dredged to elevation -55 feet. Without the remodel, Berths 32/33 could only accommodate 34-foot rail span cranes, and the cranes could not travel between Berths 32/33 and Berth 30.
Many wharves have nonlinear berths that meet at a corner. It is often economical to share cranes between these berths. To share, cranes must transfer between them. Transfer methods range from shuttle systems that move the cranes between the berths to curved rails that the cranes gantry on. Recently, the most popular method has been the curved rail.
At the Middle Harbor Terminal, a problem existed with the wharf batter piles. Some batter piles would intrude into the ship berth if the berth were to be dredged to a deeper depth. Liftech prepared a study to determine which piles should be replaced and then designed the installation of the replacement piles.
Liftech conducted an extensive wharf and crane study to help the Port of Oakland in their overall planning. Liftech calculated the ultimate wheel load capacity of all crane rail girders, waterside and landside, at all dockside container wharves for current and future channel depths. Liftech also calculated the wheel loads of all the dockside container cranes at the port. The port can use the calculated capacities to determine which cranes can be relocated from one wharf to another.
Liftech designed a new 3,600-foot container wharf for the Port of Oakland at Berths 57-59. This $90 million construction project gives the port a state-of-the-art facility designed to resist the highest probable earthquakes with minimum damage. The wharf serves six new container cranes for which Liftech provided design and fabrication review.
The original 1900-foot-long wharf consisted of a waterside sheet pile bulkhead tied back to sheet pile deadmen and an independent crane runway supported on steel H piles. The 1993 earthquake induced soil liquefaction, settlement, and lateral spreading. The entire length of wharf and crane runway rotated and translated with significant damage to about 560 feet of the middle portion.