Hydraulic and earth engineering – Foundation – Columnar structure
Patent
1996-05-08
1998-03-10
Taylor, Dennis L.
Hydraulic and earth engineering
Foundation
Columnar structure
173 1, 175 19, 405228, E02D 702
Patent
active
057253293
ABSTRACT:
A linear vibratory pile driver apparatus, system and method for using the apparatus to drive or to pull pilings. The apparatus is comprised of a lifting shaft isolated from but slideably mounted within a piston assembly which piston assembly is attached to a frame assembly. There is a cylinder assembly attached to a reaction mass and the piston assembly is vibratorily positioned within the cylinder assembly and vibratorily driven by hydraulic fluid at a selectable frequency thereby vibrating the piston/frame assembly (the piston assembly and the attached frame assembly) relative to the cylinder/reaction mass assembly (the cylinder assembly and the attached reaction mass). A clamp device such as jaws is attachable to a clamp-end of the frame assembly and the lifting shaft is attachable to a cable of a lifting apparatus such as a crane. The frequency of the vibration and the power of the vibration, which power is related to the pressure and the amount of hydraulic fluid and thus to the stroke length of the pistion, may be varied independently. By positioning the piston toward either the clamp-end or the cable end, and by adjusting the power, i.e., the stroke length, the linear vibratory pile driver may function as a hammer and a vibrator concurrently. Lowering the frequency of the vibrations and with the position of the piston toward one end or the other will result in the apparatus functioning as a hammer for either driving or pulling a pile.
REFERENCES:
patent: 3714789 (1973-02-01), Chelminski
patent: 3721095 (1973-03-01), Chelminski
patent: 4382475 (1983-05-01), Suzuki
patent: 4534419 (1985-08-01), Vural
patent: 5088564 (1992-02-01), Kobayashi
patent: 5168939 (1992-12-01), Schroeder
Dishong George W.
Taylor Dennis L.
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