Tunnel overlapping type prefabricated lining structure

The utility model discloses a tunnel overlapping type prefabricated lining structure which comprises a waterproof filling layer, a first prefabricated lining layer and a second prefabricated lining layer which are sequentially arranged along the inner side wall of a tunnel primary support from inside to outside. The waterproof filling layer comprises a waterproof plate arranged along the inner side wall of the tunnel primary support and a pea gravel filling layer arranged between the waterproof plate and the first prefabricated lining layer in a filling mode, and a gap is formed between the first prefabricated lining layer and the second prefabricated lining layer. And the first prefabricated lining layer and the second prefabricated lining layer are fixedly connected through a steel arch. The utility model has the advantages of simple structure, reasonable design, low cost, convenience in construction and installation, material saving, capability of effectively reducing self weight under the condition of ens