Nippon Concrete Kogyo Kabushiki Kaisha

Hiroshi Endo

Chokichi Sugita

Atsumi Shibuya

This invention relates to prestressed concrete piles, poles or the like pillers covered with an outer shell of steel pipe on a circumferential surface of a cylinderical prestressed concrete tube or a piller shaped prestressed concrete pole at least one end of said steel pipe being in an independent state to the concrete article. The invention provides the joint effects of the good compressive strength of the said prestressed concrete tube or pole and the good bending strength and a small frictional surface resistance of the steel pipe. One of the advantages of providing the steel pipe as the outer shell of the said prestressed concrete tube or pole relates to increasing the compressive strength of the said concrete tube or pole by preventing the generation of lateral stress within the said concrete tube or pole in a radial direction.

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Chiba, Japan

Hiroshi Endo