天津石化总公司的大件在海上过驳后,由驳船载运进入海河,被顶推到称为港池的临时码头内。龙门吊机横跨港池,将大件吊起,然后通过轨道使吊机后移并把大件卸在运输车辆上。当龙门吊机负重走行时,受力最大的一台车辆转向架的荷载达到85吨。如此巨大的集中压力是一般地基所不能承受的,而 Tianjin Petrochemical Corporation bulky at sea after barge, carried by the barge into the Haihe River, was pushed to a temporary dock called the harbor pool. Gantry cranes cross the harbor basin and lift large pieces, then move the crane backwards through the rails and unload large pieces onto the transport vehicle. When the gantry cranes carry heavy loads, the load of one of the busiest bogies reaches 85 tons. Such a huge concentration of stress is generally based on the foundation can not afford, however