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In order to overcome the influence of shallow seas, low headroom and existing bridge structure on the construction of jet grouting piles, the construction technology of mobile working platform + jet grouting with connecting rods at sea was studied and put into practical application, based on the contraction practice of the East Artificial Island of Shenzhen-Zhongshan Link. Engineering practice shows that: 1) the construction technology of mobile working platform + jet grouting with connecting rods effectively solves the technical problems in jet grouting pile construction at sea and the working platform has a wider applicable range; 2) the dynamic speed control system based on theoretical calculation formulae can better ensure the quality of jet grouting pile construction, and the deviation rate of cement dosage is only 2.4% ; 3) the impact of the construction process on the existing bridge structure is mainly manifested in horizontal displacement in the down-bridge direction and the deformation value fluctuates in the range of -1.3 ~1.7 mm, which meets the high requirements for deformation control of extremely sensitive buildings (structures). [ABSTRACT FROM AUTHOR]

：In order to build an island in the sea area of deep silt stratum under the existing expressway bridge and realize the purpose of filling construction to ensure the safety of the bridge, taking the construction of the east artificial island of Shenzhen Zhongshan Link as an example, the backfilling direction and thickness of the island reclamation were determined by numerical analysis method, and the key construction technology method of " constructing isolation steel sheet pile first, then laying sand quilt, and then backfilling sand symmetrically in layers" was proposed. Through the automatic monitoring of the whole process, it is found that the cumulative changes of settlement and displacement of expressway bridge piers are less than1mm, which realizes the safety protection of existing bridges by island reclamation construction in sea area. The results show that the construction technology of island reclamation in the sea area is feasible and the influence on the settlement of adjacent buildings is controllable. The research results can be used for reference for similar projects. [ABSTRACT FROM AUTHOR]