Single track U -shaped track girder system of a formula of striding all

The utility model discloses a single track U -shaped track girder system of a formula of striding all, it includes: double -phasely be used for walk going orbital roof beam case (1) as the vehicle to the setting, the setting is in two roof beam case (1) belows and bottom plate (2) of connecting two roof beam case (1) bottom, this bottom plate (2) with two roof beam case (1) form the U -shaped structure on the cross section, the setting is in in the space that the U -shaped structure is enclosed and lie in the sparse maintenance platform (3) on the bottom plate, and the setting is used for supporting below bottom plate (2) pier (6) of bottom plate (2). The utility model discloses a track girder system all its transverse rigidity is good with stability, wherein is provided with the sparse platform that overhauls to can be simultaneously for cable and equipment provide installation space, moreover construction convenience, view effectual, satisfy the service function requirement.