Joint construction for runway slabs of prestressed concrete

Claim 1

A JOINT CONSTRUCTION FOR RUNAWAY SLABS, PARTICULARLY FOR AIRPORT RUNAWAYS OF PRESTRESSED CONCRETE HAVING RUNAWAY SECTION WITH PROXIMATE END PORTIONS DEFINING A GAP THEREBETWEEN AND INCLUDING A PLURALITY OF STRUCTURAL CASINGS OF CAST STEEL OR THE LIKE DISPOSED ALONG THE ENDS OF SAID SECTIONS AND COEXTENSIVE THEREWITH, SAID CASINGS BEING ARRANGED IN OPPOSED COOPERATING PAIRS, WITH EACH SAID CASING HAVING A SUBSTANTIALLY VERTICALLY DISPOSED FRONT END WALL EXTENDING PROXIMATE AND SUBSTANTIALLY PARALLEL TO THE FRONT END WALL OF THE OPPOSITE CASING OF SAID PAIR WITH A SPACE THEREBETWEEN CORRESPONDING TO THE WIDTH OF SAID GAP, THE FRONT END WALL OF EACH SAID CASING HAVING AN UPPER FLANGE EXTENDING LATERALLY AWAY FROM THE GAP AND TERMINATING IN A LIP EXTENDING UPWARDLY TO THE LEVEL OF THE WEARING SURFACE OF THE SLAB AND DEFINING AN UPWARDLY OPENING RECESS PROXIMATE TO TOP OF AND ON BOTH SIDES OF SAID JOINT AND COEXTENSIVE THEREWITH, A BRIDGING PLATFORM IN SAID RECESS, EACH SAID CASING BEING PROVIDED WITH AT LEAST ONE UPWARDLY OPENING BOX SHAPED PROJECTION EXTENDING REARWARDLY FROM THE FRONT END WALL AND AWAY FROM THE JOINT AND TERMINATING IN A SUBSTANTIALLY VERTICALLY DISPOSED REAR END WALL SPACED FROM SAID FRONT END WALL, SAID PROJECTION OF EACH OF SAID PAIR OF CASINGS DEFINING AN UPWARDLY OPENING TRANSVERSELY ACROSS SAID PAVEMENT JOINT AND AT LEAST ONE LONGITUDINAL TENSION MEMBER ANCHORED TO SAID REAR END WALL OF EACH SAID CASING.