Pile driving using a hydraulic actuator

Details Pile driving using a hydraulic actuator Pile driving using a hydraulic actuator

Filed on

1987-07-30

Date issued

1992-02-25

Examiner

Eley, Timothy V.

Patent Class

Tool driving or impacting

SubClass

Processes

Other Related Categories

173 20, E21B 700

Type

Patent

Status

active

Patent number

050904850

Description

ABSTRACT:
A system is described for efficiently driving a pipe or pile into the ground. The resonant frequencies of the pile are determined, and a hydraulic actuator is controlled to apply a series of time-spaced shocks to the top of the pile, where each shock has a duration and form tuned to maximize the response at a given resonance. Such shocks result in a greater velocity of the pile at its lower end, than from very short duration shocks such as those of a hammer. In certain soils the hydraulic actuator applies resonant continuous sinusoidal vibrations to the pile, and, upon completion of installation, a refusal test of the installed pile is conducted by applying very brief and spaced shocks by the actuator that simulates hammer blows. Underwater pile driving by a hydraulic actuator avoids the need for additional special watertight structures for the apparatus. An underwater reaction mass equivalent is obtained by coupling an underwater collar or sail to the actuator, where the collar uses water resistance, in the form of hydrodynamic added mass and damping, to resist vertical motion. Integral with the system is relatively simple instrumentation which yields mechanical independence, and other in situ data, which provides information on actual down hole field conditions, and thus allows more efficient utilization of the equipment.

REFERENCES:
patent: 4058175 (1977-11-01), Holland
patent: 4377355 (1983-03-01), Chelminski
patent: 4534419 (1985-08-01), Vural
patent: 4574888 (1986-03-01), Vogen
patent: 4653593 (1987-03-01), Lindberg

Affiliated with

Also associated with

Rating

Pile driving using a hydraulic actuator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Pile driving using a hydraulic actuator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pile driving using a hydraulic actuator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1886924