Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1990-05-29
1991-02-12
Taylor, Dennis L.
Hydraulic and earth engineering
Foundation
Columnar structure
405233, 405232, E02D 534
Patent
active
049920022
ABSTRACT:
An apparatus for forming an in-ground concrete piling includes an elongate hollow mandrel which can be driven into the ground with a pile driver. A cupped foot, having a larger cross-sectional area than the mandrel, is placed beneath the mandrel before it is driven into the ground, and openings located near the bottom of the mandrel permit grout placed in the mandrel to flow into the space between the mandrel and the foot. A hollow sheath which slidably fits over the foot is attached to the bottom of an annular collar which slidably fits over the mandrel, forming a seal to prevent escape of grout from the openings while the mandrel is being filled. In use the mandrel is filled with grout before it is driven into the ground. Thereafter, during driving, the grout flows out of the openings in the bottom of the mandrel into the space around the mandrel, which is created by the foot. The column of grout in the mandrel acts as a static pressure head which forces the grout out of the mandrel into the surrounding space with a high volumetric flow rate as fast as the space is created.
REFERENCES:
patent: 1157443 (1915-10-01), Stewart
patent: 1477567 (1923-12-01), Lancaster
patent: 2010778 (1935-08-01), Stechert
patent: 3084518 (1963-04-01), Hochstrasser
patent: 3851485 (1974-12-01), Steding
patent: 3869869 (1975-03-01), Pao Chen
patent: 4018056 (1977-04-01), Poma
patent: 4618289 (1986-10-01), Federer
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