In this project, planting bars are used at the joints of new and old structures. ① Rebar planting process The rebar planting process is divided into 9 steps, including the original structure roughening treatment, drilling, hole cleaning, drying the hole wall, weighing and proportioning, mechanical mixing, glue injection, rebar preparation, rebar implantation, etc. A. The old concrete at the junction of new and old concrete shall be roughened before the original structure roughening treatment and rebar planting drilling.