Retaining wall and method of constructing same

Claim 1

IN THE METHOD OF CONSTRUCTING A RETAINING WALL ON UNSTABLE GROUND ALONG THE BERM LINE OF A BODY OF WATER, THE STEPS COMPRISING: STABILIZING SAID GROUND BY SINKING EDGEWISE INTO SAID GROUND ALONG SAID BERM LINE A ROW OF PILES IN THE FORM OF UPSTANDING CORRUGATED LOWER SHEETS OF LIGHT WEIGHT AND RIGID, MINERAL FIBER-CEMENT MATERIAL, UNTIL THE ORRUGATIONS OF SAID LOWER SHEETS EXTEND DOWNWARDLY A SUBSTANTIAL DISTANCE BELOW A SURFACE OF SAID GROUND AND UPWARDLY A SUBSTANTIALLY SHORTER DISTANCE ABOVE SAID SURFACE, CASTING-IN-PLACE ON SAID SURFACE AND ALONG EXPOSED SURFACES OF SAID PILES AN ELONGATED FOOTING A SELF-SETTING CEMENTITIOUS MATERIAL AND FORMING THEREIN AN UPWARDLY OPEN AND LONGITUDINALLY EXTENDING KEYWAY, INSTALLING LONGITUDINALLY IN SAID KEYWAY THE LOWER EDGES OF A ROW OF UPSTANDING CONTIGUOUS CORRUGATED UPPER SHEETS OF LIGHT WEIGHT AND RIGID, MINERAL FIBER-CEMENT MATERIAL, WITH THE CORRUGATIONS OF SAID UPPER SHEETS EXTENDING UPWARDLY AND WITH END CORRUGATIONS OF SAID UPPER SHEETS OVERLAPPING CORRUGATIONS, AND EMBEDDING THE LOWER EDGES OF SAID UPPER SHEETS IN SAID KEYWAY BY FILLING THE SPACE THEREIN ON BOTH SIDES OF SAID UPPER SHEETS WITH SELFSETTING CEMENTITIOUS MATERIAL.