This utility model discloses a structure for a secondary lining in a mined tunnel that also serves as a
shield tunneling starting reaction device. It includes a first primary support, a first secondary lining inside the first primary support, a second secondary lining on the sides of the first primary support and the first secondary lining,
mortar anchor bolts on the outer side of the second secondary lining, a second primary support outside the second secondary lining, a
shield machine front face on the right side of the first primary support, fiberglass anchor bolts inside the
shield machine front face, and a concrete island platform at the bottom of the inner wall of the first secondary lining. The unit price of concrete is much lower than that of steel, and by utilizing the stress characteristics of concrete, costs are saved. Using a
reinforced concrete structure reduces the structural dimensions and
working space of the steel support, avoiding large-scale excavation. Furthermore, the
reinforced concrete ring beam can later serve as a permanent secondary lining structure, reducing subsequent demolition,
cutting, and other procedures and labor costs, further saving costs.