Bed Leveling Technique with Underwater Rail Suspended on Barge and Positioned by GPS in Deep Water Channel Regulation Works at Estuary of Yangtze River

The paper introduces the bed leveling technique with underwater rail suspended on barge and positioned by GPS in deep water channel regulation works at estuary of Yangtze River.The key points are work principle,preparation of construction,construction process,technical requirements and construction problems under particular conditions.The results show that average 450 m2 foundation bed can be leveled a day,at most 600 m2 foundation bed a day.The construction technology has surpassed conventional technology and the quality of leveling can satisfy the quality requirements of the project at estuary of Yangtze River.