ABSTRACT
For pipelines buried under the sea, the disadvantages will exist either they are placed on the seabed or embedded in the seabed. For instance, corrosion on pipes is inevitable in both conditions, besides the buoyancy and the wave loading have great influence on the pipes because of shallow buried. In addition the sinking ship or other accidents might endanger the safety of the pipes as well. The jacking pipes can overcome the above shortcomings in some ways. The buried depth of the jacking pipes is usually deeper than that of the shallow buried pipes. Therefore the risk of the physical damage from surroundings or accidents can be reduced. Since all excavations are underground, the construction has very low environmental impact and it does not affect navigation and other operations on the sea. Moreover, the pipe-jacking method has slight disturbance in the seabed to ensure the soil cover maintaining compacted at the most extent. According to the demands and conditions of the project, good adaptability of large diameter steel pipes, complicated stratums, mixed straight and curved jacking, and low cost, all of
these factors indicated that the pipe-jacking method was the best choice at that time.
