English：

In view of the difficulties and high safety risks of large steel bridge installation in limitedoffshore spaces, this paper takes the installation of large steel bridge in actual project as an example. Keypoints for steel bridge layout design and hoisting construction in limited offshore spaces are systematicallyexplained and analyzed, from the comparison of steel bridge layout design schemes, crane vesselselection, steel bridge rotation, the anchoring and displacement of crane vessel and so on. Theconclusion shows that the steel bridge layout should be considered in combination with the hoistingconstruction method, and the more feasible, economical and convenient solution should be selected.Compared with the rotating crane vessel, the fixed crane vessel is more suitable for offshore hoistingconstruction with frequent displacement in a limited space. The fixed crane vessel can realize the rotationof the steel bridge during hoisting process by rotating the hook. The anchoring and displacement of thecrane vessel should be scientifically and reasonably planned and strictly followed in combination with theconstruction conditions.