Rapid construction method for secondary lining of small-section tunnel

A rapid construction device for a secondary lining of a small-section tunnel, comprising:

• a steel bar transport vehicle (1), a wheel type dump truck (2), a customized inverted arch formwork (3), a self-propelled gantry crane (4), an electric flat car (5), a portal arch wall formwork trolley (6), and a concrete pump truck (7);
• the steel bar transport vehicle (1) comprises a transport flat plate, a power vehicle head and traveling wheels, wherein a supporting and blocking structure is arranged on the transport flat plate according to a shape and a single-time transportation amount of steel bars to be transported, so as to stabilize the steel bars during classified stacking and transporting;
• after a hole is drilled, the steel bars are hoisted to the steel bar transport vehicle (1) through a working well, and transported to the hole to be close to a cleaned area;
• the wheel type dump truck (2) unloads the steel bars in the hole;
• a gantry crane structure is provided at an upper portion of the wheel type dump truck (2), and angle-adjustable rubber wheels are provided at a lower portion of the wheel type dump truck (2) to walk on structural surfaces with different radians;
• after being transported to a storage position by the steel bar transport vehicle (1), the steel bars are lifted, transferred and placed by the wheel type dump truck (2), so as to be stacked according to use sequence;
• the customized inverted arch formwork (3) is an integral steel formwork matched with a shape of a secondary lining inverted arch;
• two rails are arranged on annular ribs of the customized inverted arch formwork (3) along a tunnel direction, and adjacent formworks are butted by flanges;
• the self-propelled gantry crane (4), the electric flat car (5) and the customized inverted arch formwork (3) are used as a travelling platform for removing, hoisting, transferring and installing the customized inverted arch formwork (3);
• travelling wheels are arranged at bottom portions of the self-propelled gantry crane (4) and the electric flat car (5), and types and rail pitches of the travelling wheels are matched with the rails arranged on the customized inverted arch formwork (3);
• the portal arch wall formwork trolley (6) comprises a frame system and a formwork system, wherein the frame system has a portal structure;
• travelling wheels are connected to a bottom of the frame system through vertical oil cylinders to lift the portal arch wall formwork trolley (6);
• the formwork system is integrally sleeved on a periphery of the frame system, and comprises a top mold and a side mold with a hinged node therebetween;
• the formwork system is connected to the frame system through a hydraulic oil cylinder to support and retract the formwork system;
• the concrete pump truck (7) transport concrete from a tank car pump to a pouring site, and a size of the concrete pump truck (7) is designed according to a tunnel section size;
• during construction, the concrete pump truck (7) synchronously moves with a working face, and is located at a tail of the portal arch wall formwork trolley (6) closest to a hole entrance;
• a pumping distance is no less than four flow segments;
• during pouring, an inverted arch is poured before an arch wall, both are poured from a far end to a near end.