Reinforced concrete structures for railway crossings

Claim 1

IN A CONCRETE SLAB FOR USE AS A RAILROAD LEVEL CROSSING UNIT HAVING A PAIR OF PARALLEL GROOVES SPACED FROM ITS OUTER EDGES AND ADAPTED FOR THE MOUNTING THEREIN OF THE RAILS OF A RAILROAD TRACK WITH THE HEADS OF THE RAILS BEING FLUSH WITH THE SURFACE OF SAID SLAB, A REINFORCING STRUCTURE EMBEDDED IN SAID SLAB COMPRISING IN COMBINATION: (A) A PAIR OF THREE-DIMENSIONAL HAIRPIN MAT STRUCTURES HAVING UNEQUAL SHANKS, SAID STRUCTURES BEING DISPOSED WITH THE SURFACES FORMED BY THEIR LONGER SHANKS IN PARALLEL AND CLOSELY SPACED FROM THE LOWER SURFACE OF SAID SLAB AND WITH THE SURFACES FORMED BY THEIR SHORTER SHANKS EACH BEING CLOSE TO AND SPACED FROM THE BOTTOM OF ONE OF SAID GROOVES, TO FORM THE LOWER REINFORCEMENT OF SAID SLAB, (B) A THREE-DIMENSIONAL TRAPEZOIDAL MAT STRUCTURE BEING OPEN AT THE LONG SIDE AND HAVING EXTERNALLY SLOPING SIDES TERMINATING IN HORIZONTAL BASES, SAID TRAPEZOIDAL STRUCTURE BEING DISPOSED BETWEEN SAID GROOVES WITH SAID BASES LOCATED EACH BENEATH THE BOTTOM OF ONE OF SAID GROOVES, (C) A THREE-DIMENSIONAL INVERTED U-SHAPED MAT STRUCTURAL ALSO DISPOSED BETWEEN SAID GROOVES AND HAVING A CENTRAL SURFACE CLOSE AND PARALLEL TO THE CENTRAL SURFACE OF SAID TRAPEZOIDAL STRUCTURE, TO FORM THEREWITH THE UPPER REINFORCEMENT OF SAID SLAB, SAID USHAPED STRUCTURE HAVING SIDE SURFACES BEING PARALLEL AND CLOSE TO THE INNER SIDES OF SAID GROOVES, AND (D) A PAIR OF THREE-DIMENSIONAL RECTANGULAR MAT STRUCTURES DISPOSED EACH WITHIN ONE OF THE END SPACES OF SAID SLAB OUTSIDE OF SAID GROOVES.