Guide beam type bridging machine for passing through tunnel

The utility model relates to a guide beam type bridging machine for passing through a tunnel, which comprises a main machine frame and a lower guide beam, wherein the main machine frame comprises a main beam. A back turning landing leg, a back landing leg, a front landing leg and an advancing landing leg are orderly installed on the main beam from the back end to the front end. The main beam is provided with a track which is provided with a ran front and a back hanging beam carriers and the middle position is provided with four reels. The lower guide beam is provided with a front landing leg of the lower guide beam, a back landing leg positioned at the back end and a roller landing leg of the lower guide beam. The advancing landing leg of the main beam is supported on the lower guide beam. The machine is suitable for the normal construction of a concrete box beam bridge with a large tonnage, and moreover, the utility model can pass through a double-track tunnel by being carried by a tyre vehicle for conveying beams through automatically reducing the sectional dimension of the bridging machine under the condition of no disassembly, saving the operation time and the production cost. The primary structure member is of a folding type, which can reach the purpose of reducing the transverse width of the cross section and the longitudinal height of the cross section of the bridging machine and the utility model can automatically make room for a box beam to pass through.