The present invention relates to a fixing device for a sea floor having a twist structure for installing an offshore structure, comprising: a column member to which an offshore structure is coupled; a ground adhesion member which is placed on a sea floor and to which the column member is fixed; and a pile member which is coupled to the ground adhesion member and is inserted into the sea bed. The pile member includes: a main spiral pile which is arranged in the center portion of the ground adhesion member; and multiple twist spiral piles which are arranged in the edge portion of the ground adhesion member to surround the main spiral pile. Therefore, the present invention enables the secure installation of the offshore structure even on the soft ground or an irregular sea floor.
展开▼
