At present, the technology of CDG (Carriage of Dangerous Goods) by water is not mature enough in China. Hazardous chemicals loaded by containers sometimes fall into Yangtze River, which is a potential threat to the water quality and marine safety. According to the situation, this article designs a new automatic salvage pontoon used for salvaging containers in deep water, and describes the salvage pontoon from three aspects: pontoon control technology, container reinforcement technology and monitoring technology. Application of the S7-200PLC controls the submersible pump water and drainage in remote place, so as to control the salvage pontoon's ups and downs underwater. In order to ensure the safety and efficiency of underwater salvage, this article presents a new type of container spreader, the hanger applies magnechuck lockset and container fixture working together, which plays a dual fail-safe role for the containers reinforcement. Additionally, the automatic salvage pontoon applies ROV to monitor the circumstances and assist pontoon to salvage sediments in deep water.
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