Construction detail Column & Coping Detail, ring of 25 X 25 cms. of No. 2 @ 10 in extremes and @ 15 in between SONOTUBO of 45 cms., ring of 25 X 25 cms. of No. 2 @ 10 in extremes and @ 15 in between, for the foundation chain, from axis 1 to 9 is (30 x 15) cms. with 6 var.3 / 8 "@ 25 cms.