Detachable cyclic utilization bottomless steel jacket box and construction method thereof

The invention relates to the field of bridge construction, in particular to a detachable cyclic utilization bottomless steel jacket box and a construction method of the detachable cyclic utilization bottomless steel jacket box. The detachable cyclic utilization bottomless steel jacket box is a bottomless closed cofferdam which is formed by connecting a plurality of independent box bodies arranged around an underwater bearing platform from bottom to top; each independent box body is defined by a plurality of box body unit faces; every two independent box bodies as well as every two box body unit faces are connected through a flange plate and a bolt; the flange plates are positioned at the inner side of the detachable cyclic utilization bottomless steel jacket box; a jacket box reinforced straight support and a jacket box reinforced inclined support which forms an acute-angle included angle with the jacket box reinforced straight support are arranged in each independent box body; two ends of each jacket box reinforced inclined support are intersected with adjacent box body unit faces of the same independent box body. By adopting the structure of the detachable cyclic utilization bottomless steel jacket box disclosed by the invention, a large-scale crane is not needed, the requirement on a place is not high, the detachable cyclic utilization bottomless steel jacket box can be recycled and reused, and the construction cost is reduced.