Method of forming consolidated earth columns by injection and th

Details Method of forming consolidated earth columns by injection and th Method of forming consolidated earth columns by injection and th

1991-07-26

1993-10-26

Corbin, David H.

Hydraulic and earth engineering

Foundation

Columnar structure

405239, 405262, 405269, E02D 534

Patent

active

052560040

ABSTRACT:
A method is provided for forming consolidated earth columns of cement grout or mortar, with reinforcement bars if required, e.g., for use in building foundations or in earth consolidation works in anchoring structures of excavation barriers, which significantly reduces the time taken to form the columns and improves productivity. The method includes the steps of injecting a consolidating grout when drilling into the earth. The drill may be left inside the column if a column with reinforcement bar is required. The plant to put the method into effect has a rotating joint manifold (6) at the upper end of the boring drill (11), equipped with tangentially arranged inlets which may be selectively inclined; and a group distributor body (15) placed at the lower end of the boring drill (11) above the boring tool that is equipped with grout flow devices. If columns with reinforcement bars are required, the boring drill (35) comprises a series of disposable shafts threaded externally at both ends; the lowest bar being equipped with a base piece (40) having a grout ejector nozzle. A formation of blades, constituting the drilling tool, is attached to the bottom of the base piece. The column is cylindrical in shape, with optional downwardly converging cone shaped projections (32, 65) protruding at fixed intervals.

REFERENCES:
patent: 2412239 (1946-12-01), Weber
patent: 3255592 (1966-06-01), Moor
patent: 3391544 (1968-07-01), Daczko
patent: 3742717 (1973-07-01), Wey
patent: 4624606 (1986-11-01), Nakanishi et al.

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