Blankevoort

Claim 1

THAT METHOD OF CONSTRUCTING TUBULAR CONCRETE SECTIONS BELOW AND ABOVE WATER, COMPRISING, FLOODING THE INTERWALL SPACE OF A VERTICAL, TUBULAR, DOUBLE-WALLED FLOAT UNTIL ONE END RESTS ON A SUBMERGED BOTTOM PLATE, LOWERING A DOUBLE-WALLED MOULD WITHIN THE INNER WALL OF SAID FLOAT, TO REST ON THE PLATE, FILLING WITH CONCRETE THE INTERSPACE BETWEEN SAID MOULD WALLS, MOVING SAID MOULD UPWARDLY RELATIVELY TO THE FLOAT WHILE POURING CONCRETE INTO THE UPPER INTERWALL PORTION OF THE MOULD THUS EVACUATED, EXPELLING WATER FROM THE INTERWALL SPACE OF SAID FLOAT TO GRADUALLY RAISE SAID FLOAT RELATIVELY TO SAID MOULD, CONTINUING THE UPWARD MOVEMENT OF SAID MOULD IN AND RELATIVELY TO SAID FLOAT WHILE POURING CONCRETE AS AFORESAID UNTIL THE SECTION IS COMPLETED, TILTING THE FLOAT AND COMPLETED TUBULAR SECTION AS A UNIT INTO HORIZONTAL FLOATING POSITION, AND AXIALLY TRANSLATING SAID SECTION OUT OF SAID FLOAT.