The walking-type double-guide girder bridge erecting machine is mainly used for bridge mark construction of prefabricated beam. This kind of bridge erecting machine has the advantages of both one machine and two uses, which can set up highway beam and railway beam. The bridge machine adopts the triangle truss as the main load-bearing guide beam, and adopts the balance type through hole when erecting the single-line railway beam, which greatly improves the working efficiency. When erecting the highway beam, walking through hole is adopted, which is easy to operate, safe and reliable. (2) When erecting railway Bridges, the bridge and tunnel connection difficulties can be solved, and the synchronous laying of tunnel mouth girder and aluminum rail mould can be realized; (3) The bridge machine through simple replacement, can realize the two-way beam frame, save construction equipment, improve work efficiency; (4) The front leg of the bridge is narrow, and it is suitable for bridge erection with a small turning radius. Arc bridge with a minimum turning radius of 400m can be erection. Need to solve the problem: with the rapid development of transportation industry in our country, a growing number of railways, highways built gradually open, bridge erecting equipment in construction projects become an indispensable important constituent, esteem can overcome the connection problem of equipment such as iron dual-use, tunnels is particularly important, this product can meet the above to aluminum casting mould, but also has high technology content, construction is more flexible, compared with existing products via safer, low cost advantages, will become the development direction of the same products. The following problems are put forward :(1) highway abutment is wide, railway abutment is narrow, how is the combination of railway abutment used? (2) how to overcome the equipment and bridge of aluminum alloy casting mold. Between the transmission difficulties, in the railway construction through the tunnel, feed beam, beam, tunnel beam. 3. In the construction of aluminum alloy mold for railway bridge track-laying, standard railway line should be laid directly in order to overcome the shortcoming that there is no need to erect temporary railway line and bridge back.