The application discloses a tunnel surface
subsidence based step-by-step construction device and construction method. The application belongs to the technical field of
tunnel construction. The device comprises a plurality of top support molds, a plurality of
insertion point type
insertion units are arranged between two adjacent top support molds, each top support mold and each
insertion point type insertion unit are installed on an
assembly beam, a driving type transmission mechanism for driving the top support mold to move along the length direction of the
assembly beam is installed on the
assembly beam, and a plurality of vertical hydraulic cylinders are installed on the lower end of the assembly beam along the length direction of the assembly beam. The method is to apply the above device to step-by-step reinforcement of the tunnel. The core design of
active support, multi-point reinforcement and step-by-step advancement is adopted in the application, so that the whole process of surface
subsidence in
tunnel construction is realized, and fine control is achieved. The application has stability, high efficiency, safety and economy, and is especially suitable for
tunnel construction under complex geological conditions such as
karst, and can effectively guarantee the
engineering quality and the safety of the surrounding environment.