Light overhanging double-column type bridge structure and erecting device

The invention belongs to the technical field of bridge construction, and particularly relates to a light overhanging double-column type bridge structure and an erecting device.The bridge structure comprises a first rectangular frame, a second sliding rail is fixedly connected to the upper end of the interior of the first rectangular frame, a first sliding table is slidably arranged at the lower end of the second sliding rail, and a second sliding table is fixedly connected to the lower end of the first sliding table; a third sliding rail is slidably arranged at the lower end of the second sliding table, supporting assemblies are arranged on the two sides of the lower end of the third sliding rail correspondingly, each supporting assembly comprises a fourth sliding table slidably arranged at the lower end of the third sliding rail, and the lower end of each fourth sliding table is fixedly connected with the output end of a first hydraulic rod; a sixth sliding table is driven to drive a clamping block of a clam