Pile foundation and pile foundation installation method

A pile foundation supported on a ground surface by a plurality of driving piles, for placing a structural object on top, the pile foundation comprising

• a pile foundation body comprising:
• a lower plate disposed on a bottom side;
• an upper plate disposed on a top side;
• and
• a support post that supports the lower plate and the upper plate substantially parallel at a predetermined interval, wherein
• the lower plate and the upper plate are provided with a plurality of pile holes through which the driving piles penetrate downward in a substantially radial pattern, and
• the pile foundation body comprises a thermally insulated pyramid-shaped frost heaving prevention pyramid on a bottom surface of the lower plate, an apex of the frost heaving prevention pyramid facing downward.

A pile foundation supported on a ground surface by a plurality of driving piles, for placing a structural object on top, the pile foundation comprising

• a pile foundation body comprising:
• a lower plate disposed on a bottom side;
• an upper plate disposed on a top side;
• and
• a support post that supports the lower plate and the upper plate substantially parallel at a predetermined interval, wherein
• the lower plate and the upper plate are provided with a plurality of pile holes through which the driving piles penetrate downward in a substantially radial pattern,
• the support post of the pile foundation body is formed in a single structure and disposed at a center, and four angle steels of a same type are used for each of the lower plate and the upper plate to surround and fix four upper side surfaces and four lower side surfaces of the rectangular-solid support post to form a substantially rectangular frame shape.