Pre-supporting structure of expressway tunnel rock stratum transition area

The utility model relates to the technical field of tunnel rock stratum transition area construction, in particular to an expressway tunnel rock stratum transition area pre-supporting structure which comprises a supporting assembly, and height adjusting and controlling walking assemblies are arranged at the four corners of the lower side of the supporting assembly. The tunnel rock stratum transition area can be comprehensively supported through the supporting assembly, the top supporting plate, the first side supporting plate, the second side supporting plate and the lower supporting plate are of an arc-shaped splicing structure, and when the top supporting plate is stressed, force can be transmitted to the first side supporting plate, the second side supporting plate and the lower supporting plate; therefore, the overall supporting stability and safety of the tunnel rock stratum transition area are high, the use height of the supporting assembly can be adjusted and controlled through the height adjusting and