Patent ID: 8387941

Claim:
An upper-bearing movable formwork, comprising: left and right landing legs ( 7 ), respectively fixed on upper left and right sides of a pier shaft; left and right vertical and horizontal transfer mechanisms ( 9 ); a bearing device; and a formwork system; wherein the left and right vertical and horizontal transfer mechanisms ( 9 ) are respectively disposed on the left and right landing legs ( 7 ) and move horizontally along the left and right landing legs ( 7 ); the bearing device includes left and right main girders ( 1 ), respectively fixed on the left and right vertical and horizontal transfer mechanisms ( 9 ); and two groups of left and right guide girders ( 2 ), respectively fixedly connected to front and back ends of the left and right main girders ( 1 ); the formwork system includes: a bottom formwork ( 6 ), an inner formwork ( 3 ), and left and right formworks, in which, two ends of the bottom formwork ( 6 ) are respectively fixed on two opposite inner sides of the left and right main girders ( 1 ); the inner formwork ( 3 ) is centrally disposed on the bottom formwork ( 6 ); and the left and right formworks are respectively disposed on the bottom formwork ( 6 ), and located at left and right sides of the inner formwork ( 3 ), and gaps for forming the concrete box girder are disposed between left and right outer sides of the left and right formworks and the inner formwork ( 3 ); characterized in that: the bottom formwork further comprising: left and right bottom formwork struts ( 14 ), the bottom formwork ( 6 ) is formed by connecting the left and right bottom formworks ( 6 a ), ( 6 b ) disposed symmetrically with respect to an axis of the concrete box girder through a bolt; an inner web plate is respectively disposed on two opposite sides of the left and right main girders ( 1 ), and left and right bottom formwork connecting hinge supports ( 11 ) and bottom formwork strut connecting hinge supports ( 13 ) are respectively disposed on the inner web plate, two ends of the bottom formwork ( 6 ) are respectively hinged with the left and right bottom formwork connecting hinge supports ( 11 ), and the left and right bottom formwork struts ( 14 ) are respectively hinged with lower surfaces of the left and right bottom formworks ( 6 a ), ( 6 b ) and the bottom formwork connecting hinge supports ( 13 ) on the inner web plate of the left and right main girders ( 1 ).