Device and method for disassembling and assembling low-clearance supporting truss of overwater cast-in-place beam

The invention relates to the technical field of bridge construction, and provides an overwater cast-in-place beam low-clearance supporting truss disassembling and assembling device and method.The device comprises a barge, a carrying pole frame and hoisting equipment, and the carrying pole frame comprises a balance beam, a connecting base, a stand column and a base; the balance beam is connected to the top ends of the stand columns through connecting bases. The connecting seat comprises a first rotating assembly; the first rotating assembly is used for rotating the balance beam around the stand column. The bottom ends of the stand columns are connected to the barge through bases. The base comprises a second rotating assembly; the second rotating assembly is used for achieving rotation of the stand column on the barge around the second rotating assembly on the vertical face so as to achieve conversion of the stand column between the horizontal state and the vertical state. And the hoisting equipment is arranged