Building system

Claim 1

REINFORCED CONCRETE STRUCTURAL UNITS ADAPTED TO BE JOINED TOGETHER UNDER PESSURE, EACH UNIT HAVING REINFORCING RODS EMBEDDED THEREIN AND A FACE ADAPTED TO ABUT A FACE OF ANOTHER UNIT, AND IN COMBINATION MEANS FOR JOINING UNITS TOGETHER WITH SAID FACES IN ABUTTING RELATION, COMPRISING A SCREW THREADED END OF A REINFORCING ROD EXPOSED IN A RECESS IN A FACE OF ONE UNIT IN LINE WITH A SCREW THREADED END OF A REINFORCING ROD EXPOSED IN A RECESS IN THE ABUTTING FACE OF ANOTHER UNIT, SAID ENDS TERMINATING WITHIN SAID RECESSES, THE THREADS ON SAID ENDS BEING TURNED ON THE SAME HAND BUT BEING RESPECTIVELY OF DIFFERENT PITCH, A TURNBUCKLE ELEMENT HAVING OPPOSITE ENDS ADAPTED TO BE THREADED ON THE RESPECTIVE THREADED ROD ENDS AND HAVING A SURFACE THEREON ADAPTED TO BE ENGAGED BY A TOOL FOR TURNING IT TO SCREW AND UNSCREW IT ON SAID ROD ENDS, SAID RECESSES BEING ADAPTED TO RECEIVE SAID TURNBUCKLE ELEMENT SCREWED ON SAID ROD ENDS, SAID TUNNBUCKLE ELEMENT BEING ADAPTED TO BE SCREWED ONTO THE ROD END HAVING THE FINER THREADS AND TO BE COMPLETELY RECEIVED IN THE RECESS ASSOCIATED THEREWITH, SAID TURNBUCKLE ELEMENT BEING ADAPTED TO BE SCREWED ALONG THE ROD HAVING THE FINER THREADS AND ADVANCED INTO THREADED ENGAGEMENT WITH THE ROD IN THE RECESS IN THE OTHER UNIT, AND THE UNIT THAT INCLUDES THE ROD END WITH THE FINER THREADS, HAVING AN OPENING THROUGH ITS SIDE INTO THE RECESS THEREIN FOR INSERTION OF A TOOL TO ENGAGE AND TURN SAID TURNBUCKLE ELEMENT FOR SCREWING IT ALONG SAID ROD ENDS.