| 摘要 |
PROBLEM TO BE SOLVED: To provide a substructure that can be constructed by a relatively small construction and facilitates securing the verticality of a strut, and its construction method.SOLUTION: A substructure includes: a foundation outer pipe 1 formed by embedding a steel pipe of a sufficient length in the ground while an axis line is assumed as a vertical direction, in an improved ground G formed by improving the ground; an intra-pipe foundation part 5 with a top surface formed in an appropriate depth in the inside of the foundation outer pipe by a portion of the improved ground; a plurality of positioning protrusions 4 with the protrusion length adjustably provided in an upper end vicinity of the foundation outer pipe while projecting inside; and filling materials placed in the gap between a long object P and the basic outer pipe. A surface 20a of a foundation bottom plate 2 is horizontally maintained in the upper part of the intra-pipe foundation part, and a filler 6 is filled between the intra-pipe foundation part and a foundation bottom plate to fix the foundation bottom plate, and is supported while bringing the lower end (lower edge) P1 of a strut P into contact with the surface. |
