Inspection well thermal insulation material filling structure for tunnel center deeply-buried ditch

The utility model discloses a filling structure of an inspection well thermal insulation material for a tunnel center deeply-buried ditch, which comprises an inspection well mouth provided with a steel ladder stand, a check ring is arranged on the inner wall of the lower part of the inspection well mouth, an oil-immersed wood plate is placed on the check ring, and a thermal insulation material block is filled in the inspection well mouth above the oil-immersed wood plate. An inspection well cover plate is arranged on the top surface of the thermal insulation material block, the thermal insulation material block is divided into a front part and a rear part which are equal in size along the central longitudinal section of the inspection well mouth, the front thermal insulation material block is close to the steel ladder stand, and the rear thermal insulation material block is close to the rear wall of the inspection well mouth; a plurality of small thermal insulation material blocks are respectively filled betw