Foundation having cylindrical shell and construction method therefor
AssigneeSeiko Kogyo Co., Ltd.
InventorMitsuhiro Kunito
Life of this patent
Estimating the term…
Abstract
A foundation comprising (1) a cylindrical shell made of a cast-in-place concrete placed into a ring-like groove which is formed by excavation of the soil at the place of installation of the foundation, leaving a columnar soil located radially inward with respect to the ring-like groove without discharging the soil, and (2) an internal solidified soil formed by solidifying the columnar soil surrounded by the cylindrical shell with a chemical hardener, and a construction method therefor.
Claims15
A foundation for supporting a superstructure thereon, comprising:
- a cylindrical shell made of a cast-in-place concrete placed into a ring-like groove which is formed by excavation of the soil at a place of installation of the foundation, leaving a columnar soil radially inwardly of said ring-like groove without discharging the columnar soil;
- an internal solidified soil formed by solidifying said columnar soil surrounded by said cylindrical shell with a chemical hardener;
- and
- a covering slab, made of a concrete placed in situ, disposed on an upper surface of said internal solidified soil, said covering slab being fixed to an upper part of said cylindrical shell such that said internal solidified soil is isolated from external soil, and invasion of flowing water into said internal solidified soil is thereby prevented.
A method of constructing a foundation having a cylindrical shell, comprising the steps of:
- excavating a ring-like groove in the soil at a place of installation of the foundation in such a manner as to leave a columnar soil radially inwardly with respect to said ring-like groove;
- placing concrete into said ring-like groove to form a cylindrical shell;
- mixing and stirring a chemical hardener with said columnar soil surrounded by said cylindrical shell so as to form an internal solidified soil;
- placing concrete in situ on an upper surface of said internal solidified soil to form a covering slab;
- and
- fixing said covering slab to an upper part of said cylindrical shell such that said internal solidified soil is isolated from external soil, and invasion of flowing water into said internal solidified soil is thereby prevented.
A method of constructing a foundation having a cylindrical shell, comprising:
- mixing and stirring a chemical hardener with a soil of the ground in a wider range of the soil than a location at which a cylindrical outer shell portion is to be disposed, so as to carry out solidification treatment of the soil inside and outside of said location of said cylindrical outer shell portion;
- excavating a ring-like groove at said location while leaving said solidified soil radially inwardly with respect to said location of said cylindrical outer shell portion;
- placing concrete into said ring-like groove so as to form said cylindrical shell;
- placing concrete in situ on said solidified soil to form a covering slab;
- and
- fixing said covering slab to an upper part of said cylindrical shell such that said solidified soil located within said cylindrical shell is isolated from external soil, and invasion of flowing water into said solidified soil located within said cylindrical shell is thereby prevented.
Dependencies are inferred from the claim text.