Foundation structure and foundation construction method

A B S T R A C T Footing beam (1) making up a strip footing made of reinforced concrete has rectangular cross-sectional shape, being taller than it is wide, and has encased therewithin pair(s) of upper and lower main reinforcements (11, 12) and stirrup(s) (13); and footing slab (2) also making up same has approximately quarter-circle fan-shaped cross-sectional shape which is convex as viewed from above where it emerges to either side at a lower portion of the footing beam (1). Surface(s) of footing slab (2), such surface(s) being convex as viewed from above, is/are formed by causing at least a portion of footing slab form(s) (20), having approximately quarter-circle arcuate cross-section, to be left in place and cast into concrete. Set within footing beam (1) are at least two paired anchor bolts (3), which are respectively encased within cylindrical sheaths (31) in such fashion as to prevent grabbing thereof by concrete, and the respective lower ends of which are linked together in integral fashion by way of anchor plate(s) (32). SELECTED DRAWING: FIG. I 91 13 1f 200