Thermal insulation pavement structure of highway tunnel

The utility model relates to the field of highway tunnel heat preservation structures, in particular to a highway tunnel heat preservation pavement structure. The heat preservation pavement structure is installed on a tunnel filling layer on a tunnel inverted arch and comprises bottom plates, flat top plates and heat preservation materials, the multiple bottom plates are laid on the tunnel filling layer, the flat top plates are assembled on the bottom plates in a one-to-one correspondence mode, and gaps between the bottom plates and the flat top plates are filled with the heat preservation materials. And the highway tunnel thermal-insulation pavement structure is formed. By adopting the prefabricated thermal insulation pavement bottom plate, the thermal insulation pavement flat top plate and the thermal insulation material and adopting an assembly type construction mode, the structure not only can meet the stress requirement of a tunnel structure, but also can prevent the tunnel bottom from being frozen, impr