Abstract: This invention relates to a concrete pile having a steel plate, of a semi-cylindrical shape,integrally fixed at the outer periphery thereof. The steel plate has a number of connectors protruding beyond the inner surface so as to thrust into concrete. The connectors are formed by performing the incomplete blanking of the steel plate. When the concrete pile is subjected to a concentrated load or a large bending moment, it can be reinforced by means of the steel plate. The operation of attaching a waling to the concrete pile can be also easily performed through means of the steel plate.

Abstract: This invention relates to a method of constructing a continuous wall for supporting earth by continuously setting a number of steel sheet piles, in which a hole is bored with a screw auger, a sheet pile is sunk into the said hole with the boring, a joint of the said sheet pile is engaged with a corresponding joint of the following sheet pile, the said following sheet pile is sunk with the boring of a hole for the said following sheet pile with the said screw auger, and these operations are repeated; and further into the said holes concrete is placed or concrete piles are sunk as required.