Abstract:The phaseⅠcontainer terminal renovation project in Luojing port area of Shanghai Port is the country's first systematic port renovation project.It adheres to green,intelligent,and resource integration principles,retaining old pre-stressed high-strength concrete (PHC) pile foundations and sinking new piles into the old ones to minimize marine geological disturbance.In view of the problems that the qualification rate of the upgraded pile sinking in the old port area is limited by the distance between the new and old pile foundations at least 40 cm,the measurement error of underwater obstacles and the performance of the piling ship,the process optimization research to improve the accuracy of the short-range pile sinking is carried out,and the new technology “LiDAR scanning measurement and 3D modeling” is used to simulate the collision,and the vibrating pile sinking construction technology and the full-rotation piling ship are introduced to reasonably avoid the collision problem,so as to realize the early prediction of the collision risk before construction,and the reasonable adjustment of the pile position to achieve accurate interspersing.Measures to replace PHC pipe piles with steel pipe piles are developed for special pile positions.The final pile foundation unit project alignment rate and pass rate are more than 95%.The technical system successfully solves the problem of pile sinking under complex conditions,and provides key technical support and practical experience for the green and intelligent upgrading and transformation of old terminals.
