Tool for forming earth holes having fixed walls and method therefor
A tool comprises two coaxial casings, a leading and a trailing ones, connected by a tubular element provided with ports for discharging a fixing material into a hole. The leading casing comprises a cylindrical portion, and frontal and rear conical tips provided with spiral tapered surfaces intended for consolidating soil. The trailing casing has a cylindrical portion of a greater diameter than that of the cylindrical portion of the leading casing. In the trailing casing there is provided an axial duct communicating with a cavity of the coupling element for supplying a fixing material. A method of forming holes having fixed walls includes formation of a pilot hole using the leading casing, and subsequent formation of a hole of a predetermined diameter using the trailing casing in the advancing sinking of a pilot hole. After the well has been sunk to a full depth, the tool is lifted until it leaves the pilot hole, the fixing material is fed into the pilot hole, and the secondary sinking of the hole is accomplished, while pressing the fixing material into walls and a bottom of the hole.
- Assignee:
- Dnepropetrovsky Inzhenerno-Stroitelny Institut (Union of Soviet Socialist Republics)
- Patent Number(s):
- US 4496011
- OSTI ID:
- 5675131
- Country of Publication:
- United States
- Language:
- English
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