The number of bolts used in the connections of steel earth retaining beems (SERBs) used in excavation work is large because they are pressure-jointed with ordinary bolts. The number of bolts can be significantly reduced by changing to high-strength bolt tension joints. It is desirable to use high-strength bolt tension joints while utilizing the existing SERBs. In this study, cast-iron components were developed to be attached to the end plates and FEM analysis and structural experiments were conducted. As a result, it was confirmed that the stiffness and yield strength of the new joint structure with cast-iron components were equal to or greater than those of the conventional joint structure, and the time required to assemble the new structure was about 38% that of the conventional structure.
