SUBDIAGONAL AND MOUNTING ARRANGEMENT Russian patent published in 2010 - IPC E01D21/00 

FIELD: building.

SUBSTANCE: subdiagonal comprises racks and brace struts attached with their foots on head elements of a span, back braces integrating heads of the racks and brace struts, and tie beam integrating the racks. The novel is that the racks comprise pockets in the upper part. In lower part they contains jack beams and a hinge and bolster cap, jack columns and a footpiece having in side walls an out-of-round hole wherein vertically movable hinge of the rack cap, and wedging fits located between the bolster of the rack hinge and an upper plane of the span girt. The brace struts are attached to the bridge span by means of hinged holding bridges, and have hinged heads on their ends. The upper hinges are provided in the rack pockets, while the back braces are made in the form of reinforcing truss beams, and supplied with the hinged caps on their ends. The hinges of the holding bridges and the lower brace strut caps, as well as the upper back brace caps are connected with clamped U-bolts.

EFFECT: ensured technologically easy arrangement of the subdiagonal and controlled complete involvement in the hinged span.