Full-circle secondary lining inverted arch construction formwork system for long-distance tunnel and formwork transporting method

A formwork transporting method for full-circle secondary lining inverted arch construction of a long-distance tunnel, comprising adopting a cantilever gantry crane (2) and a transportation flat car (3) for formwork transporting, wherein travel rails of the cantilever gantry crane (2) and the transportation flat car (3) are integrated on a customized steel formwork (1), and there is no other rail;

• the formwork transporting method comprises specific steps of:
• S1:
• installing the cantilever gantry crane (2) at a hole entrance;
• hoisting the customized steel formwork (1) by a cantilever part outside the hole, and rotating for 90 degrees;
• S2:
• starting a longitudinally-moving hoist;
• moving a first formwork to pass through columns of the cantilever gantry crane (2), and transporting to a cantilever part in the hole;
• then rotating the first formwork by 90 degrees;
• S3:
• lowering the first formwork by the cantilever part in the hole;
• meanwhile, extending an oblique supporting rod out of the first formwork for supporting, in such a manner that longitudinal rails (103) integrated on the first formwork are aligned with the rails of the cantilever gantry crane (2);
• S4:
• repeating the steps S1-S3, thereby installing a second formwork, and connecting flanges (105) of the first formwork and the second formwork;
• S5:
• repeating the steps S1-S4, thereby installing residual formworks;
• using the transportation flat car (3) when the formworks are more than a certain amount, so as to improve efficiency;
• S6:
• reinforcing the formworks with steel pipe supports (7) and turn buckles (8), and pouring concrete;
• withdrawing the oblique supporting rod to a formwork surface as soon as concrete pouring is finished, and then curing;
• S7:
• removing the steel pipe supports (7) and the turn buckles (8), and installing a secondary cantilever gantry crane (2) at the hole entrance;
• S8:
• hoisting the first installed formwork by a cantilever part at the hole entrance, and rotating by 90 degrees;
• starting the longitudinally-moving hoist, moving the first installed formwork to pass through the columns of the cantilever gantry crane (2), and transporting to a cantilever part at the other end;
• then rotating the first installed formwork by 90 degrees and placing on the transporting flat car (3);
• S9:
• moving the transportation flat car (3) to the secondary cantilever gantry crane (2), hoisting the first installed formwork by a cantilever part at one end, and rotating by 90 degrees;
• starting the longitudinally-moving hoist;
• moving the first installed formwork to pass through the columns of the cantilever gantry crane (2), and transporting to a cantilever part at the other end;
• lowering the first installed formwork to finish transportation and installation;
• and
• S10:
• repeating the steps S8 and S9;
• transporting, installing, supporting and reinforcing the residual formworks, and pouring concrete.