1 is again shown in this form of the invention however filler blocks 90 having a profile similar to the filler blocks 84 are provided however the filler blocks 90 extend longitudinally the approximate length of the encasement e to form a cylindrical edge surface 91 a nail or pin 76 is again driven through the pole pieces 46 and 48 to secure such pole pieces to the element m 1 suitable sealing means not shown are provided underneath the wrapping bands 53 referring now to fig2 there is shown a metallic structural element m 2 of generally v shaped transverse cross section similar to that shown in fig1 17 and 18 in fig1 however the element m 2 is shown provided with a pair of filler blocks 92 and 94 secured to the exterior surfaces of the legs of such element and a third filler block 96 of semicylindrical profile the filler blocks 92 94 and 96 cooperate to define a cylindrical edge surface 98 for receiving the encasement e a nail or pin 76 is extended through the pole pieces 46 and 48 into the filler block 96 referring now to fig2 there is shown a cylindrical metallic columnar element m which is driven into the earth 100 and extends upwardly through a body of water the lower portion of an encasement e of the type described hereinabove the foam 54 and seal band 53 is covered with a hand packed quantity of concrete or.