The outstanding characteristics of the recent wind power market at home and abroad are summed up by the large scale of complexes and the large scale of turbines, especially the offshore wind power market is rapidly growing as a way to overcome difficulties in securing land on the ground due to the depletion of good land positions around the world and rising civil petitions. Although offshore wind power generation is advantageous to large areas because it does not incur much costs to purchase land compared to land wind power generation, since the cost of installing lower structures is high, innovative technologies for installing substructure must be secured in order to create large offshore wind power plants and secure competitiveness in the offshore wind market. In order to lead the global offshore wind power market, it is urgent to secure leveling technology to secure seniority when installing lower structures.
In this paper, among the various substructure of offshore wind power generators, it was intended to study leveling tools that could be applied to jacket-type structures and installed in jacket-type structures and in jacket files to level the substructure. The tightening performance of the jacket file of the leveling tool for securing the verticality of the lower structure was studied through the test, and the tightening performance test was performed using a leveling tool prototype and a separate device for performance evaluation. The leveling tool consists of a gripper part consisting of a clamping hydraulic cylinder and clamping pad, and a leveling part consisting of a leveling cylinder and a leveling sensor, which requires an intensive study of the gripper part to analyze the tightening performance. The gripper part tightening performance test of the leveling tool aims to achieve the optimum tightening performance required by the load of the jacket file.