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Патент USA US3020975

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Feb. 13, 1962
Filed Aug. 19, 1959
United States Patent G ice
Richard F. Keller, J12, 4448 49th St.
San Diego 15, Calif.
Filed Aug. 19, 1959, Ser. No. 834,901
1 Claim. (Cl. 175-422)
(Granted under Title 35, US. Code (1952), see. 266)
Patented Feb. 13, 1962
submerged pile to be removed, showing the pressurized
?uid ?ow cutting away the impacted soil supporting the
base of the pile;
FIG. 2 is a partial side elevation of the pile extractor;
FIG. 3 a bottom plan view of the pile extractor showing
the disposition of the nozzles and projections on the- lower
guide means.
Referring to the drawings where like reference numerals
The invention described herein may be manufactured
and used by or for the Government of the United States 10 refer to similar parts throughout the ?gures, FIG. 1 shows
a novel pile extractor l0 suspended by a pair of cables 12,
of America for governmental purposes without the pay
ment of any royalties thereon or therefor.
forming part of a bridle, from a crane or the like (not
shown). The extractor is shown positioned over a con
This invention relates to devices for removing piles and
ventional pile 14 to be extracted from ground 16, which
more particularly to a hydraulic device for extracting piles
15 in most instances is partially submerged.
driven in the earth, often partially under water.
Extractor 10 comprises a frame-like structure 18 in
The use of wooden piles as the supporting structure
for wharves, anchorages, and the like is an old established
practice. For the most part such piles were constructed
of specially treated wood, i.e., a trimmed tree trunk, al
lower rings 20, 21 respectively, ?xedly spaced apart by
used to a minor extent.
ring, it of necessity must be the lower ring 21 as will be
cluding one or more guide means, such as upper and
one or more rigid vertical standards 22, which may be
though, recently, reinforced concrete piles have been 20 pipe. Where the extractor is constructed with only one
Because of various marine in
sects, breakage, and other factors, replacement of piles
are a periodic necessity, the frequency of replacement of
wooden piles depending primarily on the particular water
apparent in this description. Suitable plates 19 and tubes
23 may be Welded to the frame for reinforcement. The
inner diameters of rings 20, 21 arev su?iciently larger than.
25 the diameter of the pile to permit the frame to be slidably
Heretofore the piles were removed by a crane hauling
up a chain wrapped around the piles which operation usu
ally necessitated the services of an under water diver.
This procedure was time consuming, and, frequently re
mounted and guided over the piles, but without excessive
clearance to enable the piling to be centered therein for
called blue clay bottom subsurface soils present a formidaé
are pivotally connected to clevises 28 attached to eyes on
a reason to be explained.
The upper portion of frame 18 includes a pair of ad
sulted in broken piles. If breakage occurred, in some 30 ditional vertical supports 24, which can be extensions of
vertical standards 22, secured to upper ring 20, and at
instances the remaining stub of the piles had to be aban
the other end hingedly connected at 26 to links 27 which
doned in the submerged position. Piles embedded in so
ble removal problem by the chain method.
The present invention utilizes a device having a plu
rality of ?uid jets designed to wash away the compacted
soil supporting, and entirely surrounding the base of the
embedded pile. The device comprises a frame having at
cables 12. Upper spacer ring 30 is clamped between links
27 and move therewith enabling the frame to be readily
lifted to a vertical position from a horizontally stowed
Lower ring 21 is of a hollow tubular construction hav
ing connected thereon a plurality of downwardly depend
40 ing nozzles 32, twelve such nozzles being illustrated in
standards. The frame is loosely slidable over the top
the drawing. The nozzles are preferably axially disposed
of the pile and is suspended by a crane or the like to
downwardly at an angle, all inclined in the same cir
control vertical movement during the lowering of the
least one guide means supported by one or more vertical
cumferential direction, and are also canted inwardly to
The lowermost guide means supports a plurality of jet 45 ward the pile. The lower ring serves as a manifold to
distribute the ?uid flow to the nozzles. The outer pe
nozzles extending generally parallel to the longitudinal
riphery of the lower ring has integrally mounted a plu
axis of the pile, the nozzles being connected by a conduit
rality of spaced downwardly and outwardly pointed pro
to a source of pressurized ?uid, preferably water. In the
jections 33 which are longer than nozzles 32 to protect
preferred embodiment, the lower guide means is a circular
the latter from damage by engagement with rocks, etc.
tube which forms a manifold for the jet nozzles. The
Lower ring 21 is supplied with pressurized water
vertical standards of the frame may be hollow and con
through pipes 22 and ?exible hoses 34 connected thereto
nected to the lower guide to serve as a conduit for the
adjacent the upper ring 20. The other end of hoses 34
pressurized water. The outer periphery of the lowermost
are connected to a source of pressurized water, i.e. pumps
guide means encircling the jet nozzles may be provided
with pointed projections to protect the nozzles and to 55 (not shown). Flexible hoses 34 are supported on the
extractor frame by a pair of semi-cylindrical guides 36
assist by cutting away the impacted ground surrounding
to vertical supports 24. The hoses permit the
the piling.
device to oscillate during operation presently to be de
A principal object of this invention is to provide a device
for extracting piles which utilizes pressurized ?uid uni
In operation, extractor 19 is lifted by a crane through
formly distributed around the base of the embedded pile. 60
cables 12 and slid over the particular pile to be removed,
Another object is to provide such a device which will
being guided by lower ring 21 and upper ring 20 if two
guide itself on the piles and be self-aligning.
rings ‘are used. The pressurized water passes through
Still further objects are to provide a hydraulic pile ex
hoses 34 and vertical standards 22 to lower ring 21 which
tractor that will remove piles quicker, with less personnel,
distributes the flow to the jet nozzles 32. The water
and therefore more economically.
emitted from the jets is directed downwardly and toward
Other objects and many of the attendant advantages
the pile to loosen the earth immediately surrounding the
of this invention will be readily appreciated as the same
embedded end of the pile. The guide rings ensure that
becomes better understood by reference to the following
the extractor will travel parallel to the pile throughout
detailed description when considered in connection with
any inclination of the pile, and that the nozzles will always
the accompanying drawings wherein:
be in close proximity thereto. The inclined disposition of
FIG. 1 is a front elevation of the novel pile extractor
the nozzles causes the jet discharge to assume a swirling
device, partially in section, suspended over a partially
?ow, in the direction of arrow 38 (FIG. 3), which ?ow
keeps the loosened soil particles in motion. The soil
particles being in suspension are gradually ?oated up
wardly with the water out the pile socket, preventing any
tendency of the particles to settle back and recompact
against the pile. As the extractor is lowered against the
sub-surface, projections 33 on the lower ring serve as
blades to cut and break away soil particles, i.e. rocks
around the pile too hard or dense to be removed solely
a swirling jet ?ow which enables a more e?icient cutting
of the soil from the base of the pile.
Obviously many modi?cations and variations of the
present invention are possible in the light of the above
teachings. It is therefore to be understood that within
the scope of the appended claim the invention may be
practiced otherwise than as speci?cally described.
I claim:
A hydraulic pile extractor comprising a frame including
by the hydraulic ?ow from the nozzles. In addition, the 10 vertically spaced upper and lower rings capable of sliding
projections, being longer, protect the nozzles from damage
from rocks and the like. The projections are peripherally
spaced apart to permit passage of the upward ?ow with
the loosened soil. As the extractor is worked toward the
bottom of the pile, the extractor may be slightly raised
and dropped repeatedly against the bottom to assist the
cutting action of projection 33. The swirling jet ?ow
from the inclined nozzles causes the extractor to rotate,
being permitted by ?exible hoses 34, and the extractor
assumes a new position when repeatedly dropped taking
a fresh “bite” in the soil. The rate of descent of the
extractor will depend to a large extent on the nature of
longitudinally over an embedded pile to be extracted,
means for suspending the frame around the pile, said
upper ring being pivotaliy mounted on the frame about an
axis transversely of the pile and capable of being pivoted
by the suspending means, said lower ring supporting a
plurality of downwardly-directed jet nozzles, the lower
ring being hollow to form a manifold for said nozzles, a
portion of said frame providing a conduit means connect
ing the lower ring to a source of pressurized water, all of
said nozzles being axially inclined radially toward the
pile and canted in the same circumferential direction, said
rings centering the extractor around the pile and main
the subsoil. In practice, piles have been removed within
taining the nozzles in close proximity thereto, whereby the
seven minutes.
nozzles direct multiple jet ?uid streams against the soil
surrounding the base of the pile to create a swirling flow
As the impacted ground around the embedded piling
is loosened, the high pressure water emitting from the
nozles tends to exert an upward pressure, thus reducing
the pull that may be required by a crane or the like to lift
the pile. In most cases, the pile ?oats free out of its
socket without the assistance of a crane.
around the pile.
References Cited in the ?le of this patent
The novel pile extractor effectively removes piles
quickly without the danger of breakage or the need of
O‘Marr _____________ ..__ Mar. 14, 1922
Bignell _______________ __ Oct. 4, 1927
Rotinoff _____________ __ Apr. 12, 1932
divers. The extractor is installed over the upper end of
Bignell _______________ __ Aug. 1, 1944
Germany _____________ .._. Oct. 18,1930
France _______________ __ Nov. 3, 1958
the pile and is guided along the pile, regardless of any
inclination, to maintain the jet nozzles in close proximity
to the pile. The jet nozzles are axially inclined to cause
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