CROSS JOINT FOR ORTHOTROPOUS SLAB OF BRIDGE SUPERSTRUCTURE AND METHOD OF MAKING IT Russian patent published in 2008 - IPC E01D1/00 E01D12/00 

FIELD: construction.

SUBSTANCE: invention pertains to bridge construction and can be used in making cross joints of an orthotropous slab of a bridge superstructure. The cross joint of an orthotropous slab of a bridge superstructure consists of floor plate, adjoining parts of trapezoid longitudinal stringers with diaphragms-stopper plugs and straps. On the lateral walls of the longitudinal stringers and straps, there are coaxial openings, in which there are high-strength bolts. In the gap between the adjoining parts of the trapezoid longitudinal stringers there are flat insertions, with cross-section thickness equal to the thickness of the walls of the trapezoid longitudinal stringers and whose upper ends are welded to the lower plane of the floor plate. In the insertions and floor plates there are coaxial openings, in which there are high strength bolts, and in the lower horizontal part of the adjoining parts of trapezoid longitudinal stringers there are access holes. The flat insertion can have a necked part with coves. The floor plates can be one-sided, as well as two-sided. The method of making a cross joint for an orthotropous slab involves welding diaphragm-stopper plugs to the trapezoid longitudinal stringers, grooving the edges, welding the branches of longitudinal edges to the floor plate, leaving break-ups on each side of the joint. After welding the ends of the floor plate together, flat insertions with carved edges are placed with a gap relative the butt-end walls of trapezoid longitudinal edges, joined together by adjacent parts of the walls of trapezoid longitudinal stringers and flat insertions using straps and high strength bolts, with tightening them by a force, less than the designed. After that, the upper parts of the flat insertions are welded along the whole contour with a solid throat welding to the lower plane of the floor plate. Sequential welding of longitudinal edges is done in the broken-up spots and all the high strength bolts are tightened using the designed force. Carving the edges of the trapezoid and flat insertions is done at an angle of (55±3)°. Break-ups during welding branches of longitudinal edges to the floor plate are done with length not less than 200 mm. High strength bolts are tightened by a force which is 60-70% of the designed force. Flat insertions with carved edges are put relative the butt-end walls of the trapezoid longitudinal stringers with a gap not less than 10 mm.

EFFECT: simplification of coupling edges when they are misaligned.

9 cl, 4 dwg