Construction technology of steel concrete combination continuous beam for a long-span bridge crossing railway by dragging method

When a new railway is selected and designed,the bridge crossings over old railway,highway,urban road and river are inevitable.In the construction of these bridges,the key point is how to reduce and eliminate the disturbance of bridge construction on old railways or rivers.During the construction of the long-span bridge in Qinshen railway over Shenshan railway,the construction technology of total assembling and dragging steel beam unilaterally with reverse wheel is adopted with the normal work of existing railway.The out mold board is erected on bracket using intensity of steel beam itself and concrete of bridge board is continuously cast.The problem of such difficulty is solved and experience is obtained for similar bridge construction.