In view of the current cross influence between the coastal bridge and the general earth-rock seawall in the deep silty foundation in the coastal area,by the pile type comparison (bored pile,large-diameter thin-walled pile and U-shaped prestressed sheet pile) and pile foundation layout scheme comparison and selection (closed row,2 times pile diameter interval and all-round arrangement) and other in-depth comparative analysis,combined with vertical bearing capacity and horizontal bearing capacity calculation and comparison,a new type of ribbed structure seawall structure with double row long and short densely packed pile foundation is proposed.The deep silt foundation is all-round solidified and strengthened in shallow layer.The new structure can effectively avoid the adverse impact of the settlement of the general earth embankment on the negative frictional resistance of the pier of the coastal bridge,effectively ensure the safety of the bridge,and at the same time save the construction period of the cross section bridge and the cross section seawall.Through the analysis of monitoring data such as actual settlement after completion,it is considered that the new structure effectively ensures the safety of the bridges at the intersection.