Patent ID: 7470093

Claim:
A seawall element comprising: an elongated tubular member formed as a unit of plastic material having a cylindrical hollow elliptic or oval-shaped cross section of substantially uniform wall thickness and open at each end thereof; said tubular member having slidably mating interlocking male ball and female pocket portions along the length of either side, respectively, of said tubular member for interlocking two side by side said tubular members together by slidable overlapping engagement lengthwise one said tubular member to another without additional external fastening or connecting means therebetween; each said tubular member including two spaced opposing plate receiving slots positioned on an outer surface of said tubular section and oriented, when two of said tubular members are interlockingly engaged one to another, to slidably receive a plate to form a generally triangular concrete reinforcing cavity between each two interlocked said tubular members.