Sectional pier

Claim 1

FOR USE IN A SECTIONALIZED PIER STRUCTURE, A UNIT FOR CHAINWISE COUPLING COMPRISING A RECTANGULAR BLOCK HAVING A FIRST, GENERALLY PLANAR FACE, AND AN OPPOSITE FACE WITH CO-PLANAR, MARGINAL PORTIONS ON ITS FOUR SIDES EXTENDING DOWNWARDLY FROM SAID OPPOSITE FACE, AND DIAGONAL WEBS EXTENDING DOWNWARDLY FROM SAID OPPOSITE FACE, WITH RECESSED AREAS BOUNDED BY SAID PORTIONS AND SAID WEBS, SAID BLOCK HAVING PERFORATIONS IN SAID RECESSED AREAS, AND BORES IN CORNER AREAS COMMON TO ADJACENT PAIRS OF SAID MARGINAL PORTIONS, A RECTANGULAR TAB ON ONE SIDE OF SAID BLOCK, MEDIALLY THEREOF, EXTENDING THEREFROM, AND EXTENDING DEPTHWISE FROM SAID FIRST FACE TO A PLANE INWARDLY OF THE PLANE OF SAID MARGINAL PORTIONS, AND SAID TAB HAVING A RECTANGULAR, THROUGH OPENING DEPTHWISE, THE OPPOSITE SIDE OF SAID BLOCK FROM SAID ONE SIDE HAVING A RABBETED RECESS IN ITS UPPER CORNER, SIZED AND DISPOSED IN COMPLEMENTARY RELATION TO SAID TAB, INCLUDING A RECTANGULAR BOSS EXTENDING UPWARDLY THROUGH THE RECESS TO SAID FIRST PLANAR FACE AND ADAPTED TO MATE WITH THE OPENING IN THE TAB, WHEREBY THE RECESS OF ONE BLOCK MAY RECEIVE THE TAB OF ANOTHER, IN INTERLOCKING RELATION, AND THE OTHER TWO SIDES OF SAID BLOCK, RESPECTIVELY, HAVING A RECESS AND A TAB OF STRUCTURE IDENTICAL WITH THE FIRST MENTIONED RECESS AND TAB.