US3417828A - Method for driving piles and similar objects - Google Patents

Method for driving piles and similar objects Download PDF

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Publication number
US3417828A
US3417828A US524773A US52477366A US3417828A US 3417828 A US3417828 A US 3417828A US 524773 A US524773 A US 524773A US 52477366 A US52477366 A US 52477366A US 3417828 A US3417828 A US 3417828A
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United States
Prior art keywords
hammer
pile
force
piston
impact
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Expired - Lifetime
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US524773A
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English (en)
Inventor
Hoite C Duyster
Joost W Jansz
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Bomag Menck GmbH
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Hollandse Beton Mij N V
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Publication of US3417828A publication Critical patent/US3417828A/en
Assigned to HOLLANDSCHE BETON GROEP N.V. reassignment HOLLANDSCHE BETON GROEP N.V. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: HOLLANDSCHE BETON MAATSCHAPPIJ N.V.,
Assigned to KOEHRING GMBH-MENCK DIVISION reassignment KOEHRING GMBH-MENCK DIVISION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HOLLANDSCHE BETON GROEP NV A CORP. OF THE NETHERLANDS
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
    • E02D13/10—Follow-blocks of pile-drivers or like devices
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/18—Placing by vibrating

Definitions

  • FIG. 6 9 ll L0 2 6 FIG. 2 FIG. 5 3 j ll-llll g 1 7 /6 4 l K? i 5 243E111 9 m FIG. 6
  • a pile driving apparatus having a resilient cap or shoe between the pile head and the hammer, said cap or shoe being precompre-ssible and maintainable in a particular state of precompression such that when the hammer strikes the cap, substantially no energy is lost by dissipation and the maximum impact force which is transmitted through the cap to the pile is less than the critical force at which the pile is damaged.
  • This invention relates to a method of driving piles and the like, in which use is made of a hammer, which is dropped from some height and trasmits its kinetic energy to the pile when the blow strikes the pile head.
  • the impact force created during the energy transmission from the hammer to the pile may in practice not exceed such a value that the pile head is shattered. In order that the pile may penetrate into the ground, the impact force should however at least reach a minimum value, which depends upon the nature of the ground. If the pile may not be subjected to tensile stresses, or may only be subjected to low tensile stresses, the energy transmission must occur within a minimum time period, which among other factors depends upon the pile length and the impact diagram.
  • cap a so-called cap is often used, a resilient, but if exceeding a certain compressive force, permanently deformable means, which is placed between the pile head and the hammer.
  • the cap comprises a steel jacket, retaining elastic material with stiff resilience, usually composed of hard wood, that must be loaded parallel to the fiber, in the form of a plug, with under it a soft wood filling, which should be loaded perpendicular to the fiber.
  • This cap is considered on the one hand to render a reasonable force distribution on the pile head by elastic deformation, and on the other hand to prevent the impact force, exerted on the pile, from exceeding a value, which is dangerous for the pile, by dissipating a portion of the energy by permanent deformation-scatter-of the wooden filling.
  • the soft wood filling soon loses its deformability so that it is necessary to periodically replace said filling.
  • both the resulting impact diagram and the duration of the impact among others depend upon the deformability of the filling, which decreases as a result of the hammering action, and are both by no means optimally favorable for reducing the aforesaid tensile stresses in the pile.
  • soft wood such as rubber and plastics
  • these disadvantages moreover require that for driving longer and heavier piles heavy hammers must be used.
  • an improved method of driving piles and the like is provided, and an apparatus which may be used for the purpose, in which the kinetic energy of the hammer is more completely utilized, because the useless consumption of energy in the initial and final periods of the impact is avoided and the necessity of dissipating energy by permanent deformation is eliminated by providing a resilient means between the hammer and the pile head, characterized by creating and maintaining a precompression in said resilient means, so that immediately from the beginning under each hammer blow the minimum required force, sufficient to overcome the ground resistance, will be available, while under the impact said resilient means is deformed to a relatively great extent, with a corresponding relatively small increase of the force.
  • FIGURE 1 schematically shows the graph of the force exerted on the pile during each striking action, plotted in a time-impact force diagram, when using the known cap.
  • FIGURES 2-5 show the principle of the device according to the present invention.
  • FIGURE 6 shows a time-impact force diagram obtained by using the device according to the invention, and also the theoretically optimum diagram.
  • FIGURES 7-9 are sections of various embodiments.
  • FIGURE 10 is a section of a complete hammer, with a built-in precompressed resilient means in accordance with the invention, in which the value of the precompres sion is automatically maintained.
  • FIGURE 11 is a partial view of the top of FIGURE 10 showing the control valve in a different position.
  • FIGURE 1 schematically represents a stroke diagram, in which the level P indicates the minimum force required to overcome the ground resistance, opposing the penetration of the pile, and P represents the maximum force that is, the force which should not be exceeded in order to prevent damage to the pile.
  • a material or combination of materials is selected, which is capable of resiliently receiving the entire fall energy of the hammer, thus enabled by the said precompression principle, whereby the maximum force created thereby, can be previously determined at a value which prevents damage to the pile.
  • FIGURE 6 The thereby obtained time-impact diagram is shown in FIGURE 6, wherein the theoretically optimum diagram is shown in the shaded portion.
  • the diagram clearly shows the following favorable characteristics:
  • the maximum value P of the diagram can previously and exactly be determined and with certainty be fixed below the critical value P (3)
  • the maximum impact force is not reached until after a relatively long time i so that only in relatively long piles do tensile stresses occur, which moreover in that case are not proportional to P but to the so much smaller value P P
  • the relatively long impact duration i the invariable minimum value of which may previously be determined, only in very long piles can tensile stresses of any significance exist, which in such case are proportional to P
  • the improved apparatus according to the invention is substantially based on the following principles:
  • FIGURE 2 shows an example hereof, in which the helical spring 4 is precompressed by tightening the bolts 5.
  • FIGURE 3 shows an example hereof, in which in a cylinder 7 under a piston 8 a gas 6 is precompressed, with a collar 9 of the cylinder 7 limiting the stroke length of the piston 8.
  • FIGURE 4 shows an example hereof, within a cylinder 7 under a piston 8 a liquid 10 being present, which is precompressed by a piston 12, on which in the housing 13 the spring 14 operates.
  • the collars 9 and 15 limit the stroke lengths of the respective pistons 8 and 12.
  • a flying piston 16 having on one side the incompressible, but readily deformable medium 10 and on the other side the gaseous medium 6. At one end of the housing 7 is closed by the piston 8, with the stroke length thereof being limited by the collar 9, as is indicated in FIGURE 5. The medium 10 is precompressed by means of the gas 6.
  • the stroke diagram of all the basic embodiments may be represented schematically as shown in FIGURE 6.
  • the buckling point A in the diagram will be at a pressure level P determined by the precompression.
  • the displacement to reach A is determined by the deformation of the stiff-elastic construction 1 as a result of the precompression, that is the elongation of the bolt in FIGURE 2, the deformation of the cylinder 7 and the collar 9 in FIGURES 3, 4 and 5. Since said censt uc i t 1, in view of the great forces, will be very stiff, the displacement to reach point A will be small, so that the graph 0A in the diagram will be very steep.
  • the following part AB of the graph is determined by the force required to deform the resilient construction, that is the spring 4 and 14 respectively in FIGURES 2 and 4 and the gas column 6 in FIGURES 3 and 5, so that the slope of AB can be adjusted within wide limits by the selection of materials and volumes.
  • the buckling point A will be above or at least close to the level P (FIGS. 1 and 6) which indicates the minimum force required to overcome the ground resistance opposing the penetration of the pile
  • the point B will remain below the level P which represents the force which should not be exceeded in order to prevent damage to the piles. Accordingly the pile cannot be damaged, even if the pile does not penetrate at all.
  • the deformation in the resilient means will proceed entirely elastic, so that in said means little or no energy is lost.
  • the steep onset of the graph 0A in the diagram according to FIGURE 6 has moreover the great advantage, that the extent of the deformation of the elastic means under the influence of the blow is limited in proportion to the energy transmission, so that the development of heat in the elastic means remains low, which is affirmed by experiments.
  • materials may be used, which without precompression would soon be unusable because of heating.
  • FIGURE 7 shows a basic drawing according to the invention, in which the gas of FIGURE 3 is replaced by a cylindrical element 17 of soft rubber or similar material, which is retained between steel plates 18, linked by one or more bolts 5, and in which a uniform precompression is created without deformation by a binding 19 with a string which is wound under stress, or a strip of an elastic material such as rubber.
  • FIGURE 8 shows a suitable further development of the principle of FIGURE 4, in which the core 20 of rubber or similar material is enclosed by a hollow metal cylinder 21, composed of adjacent thin radial lamellas, bearing upon the metal edges 22.
  • the hollow cylinder 21 is wrapped with a string or similar strip of elastic material 19 under stress. With sufficient load the core 20 can push the lamellas 21 of the cylinder apart against the force exerted by the material 19.
  • FIGURE 9 shows a suitable further development according to the principle of FIGURE 3, in which, however, the gaseous medium 6 is precompressed in a deformable envelopment 23 of rubber or similar material, which is supported on all sides by the housing 7 and the therein located piston 8, with the displacement of which is limited by the collar 9.
  • FIGURES 10 and 11 show a complete pile driving apparatus according to the invention, of which the hammer incorporates the precompressed resilient means, with means whereby the value of said precompression is automatically maintained.
  • the hammer is provided at its lower end with the resilient means according to the principle of FIGURE 5, in which the space with the liquid medium 10 being connected thru a conduit 24, incorporating a non return valve 25, scaling in both directions, with the space 26 above the piston 27 in a vertical bore in the hammer 3.
  • the piston 27 is carried by a hollow piston rod 28 which is integral with or fixed to the end wall 29 of a housing 30 in which the hammer 3 moves, the bot tom of the housing 30 being provided with an anvil plate 31, and guiding means 32 for the pile 2.
  • the hollow piston rod 28 is provided at the lower end with openings 33 communicating with the space 26 above the piston 27, and is connected at its upper end to a three-way control valve 34 carried by the end wall 29.
  • the three-way control valve can be operated to connect the hollow piston rod through a conduit 35 with a pump for pumping and compressing the liquid medium (FIGURE or to a conduit 36 (FIGURE 11) discharging into the liquid supply tank.
  • the spaces or conduits 10, 24, 26, 28, 35 and 36 are continuously filled with the liquid medium.
  • the liquid in the space 10 also serves as a seal to prevent leakage of the compressed gas 6.
  • the hammer 3 can fall freely in the housing 30 under the force of gravity, the liquid medium being expelled from the space 26 without causing resistance, since the channels and conduits are of sufficiently -large dimensions.
  • the hammer 3 In its lowermost position, the hammer 3, through its ram 8 which projects below the bottom of the hammer, hits the anvil plate 31 and transmits its kinetic energy to the pile 2.
  • a relatively thin plate of a suitable material may be located between the anvil plate 31 and the pile 2 to ensure a uniform force distribution on the pile head. During this impact the precompressed resilient means situated at the bottom of the hammer 3, will function according to the diagram of FIG- URE 6.
  • the hammer 3 will more or less bounce up in its housing 30, at the time of impact an impulse is produced to operate the three-way control valve 34 to change its position back to that shown in FIGURE 10, whereby the space 26 above the piston 27 is again pressurized by the pump and the hammer 3 is moved.
  • a communication is established via the non return valve 25 and the conduit 24 with the liquid filled space 10 below the piston 16.
  • a return valve 25 of such construction that it will only open until a preliminary determined and adjustable pressure valve, and provided that this value is below the pressure which must be created in space 26 in order to move the hammer 3 upwards, it is possible to ensure that, during each upward movement of the hammer 3, the desired pressure of the liquid medium in the space 10 will be automatically maintained or restored .prior to the next impact.
  • the herein described method is adaptable to a fully automatically operating hammer.
  • the transferred energy can be regulated during the operation by modifying the drop height, which could, for example, be accomplished by producing the impulse for changing the three way control valve 34 from the position shown in FIGURE 10 to the position shown in FIGURE 11, before the end of the upward movement of the hammer 3.
  • Externally operated means may be provided for adjusting when said impulse is automatically created.
  • a further refining for increasing the efficiency of the apparatus consists in providing an accumulator in the supply conduit 35, so that the intermittently required maximum output from the pump can be obtained by a continuous output, from a smaller pump.
  • a method for driving a pile comprising applying an impact force to a regulable resistancedevice interposed between theforce and a pile to be driven, adjusting the resistance in said device such that upon initial application of the force to the device, the force is unyieldingly resised such that the force builds up to a predetermined intensity above a particular minimum value, after which the force is transmitted to the pile by said device at an intensity level below a predetermined maximum value as established by the magnitude of resistance adjustment.
  • Apparatus for the driving of a pile by the blows of a hammer comprising means in the path of the hammer for receiving the blows therefrom and for transmitting, to the pile to be driven, a force which has a value between a predetermined minimum and a predetermined maximum, said means comprising a regulable and precompressible device adjusted to a predetermined elas tic resistance for receiving the energy of the blows and for transmitting said energy to the pile as a force which has a value between said minimum and maximum.
  • said regulable and precompressible device includes a compressible substance and means for precompressing the substance to a preestablished degree whereby the latter has a predetermined elastic resistance for transmitting the energy of the blows to the pile.
  • said precompressible device includes a cap containing a compressible substance.
  • Apparatus according to claim 5 wherein the means for precompressing the substance comprises at least one elastic tie connection.
  • said cap comprises an upper and a lower plate, said elastic material being retained between said plates, at least one tie bolt connecting said plates so that a precompression of the elastic material may be effected.
  • said precompression device includes a hollow metal cylinder comprising adjacent thin radial lamellas, which are centered by edges, said rubber core being disposed in the cylinder, said prestressed elastic material encircling said cylinder.
  • said precompressible device includes a cap, said substance being a gaseous substance, and a rubber container in said cap for containing the gaseous substance.
  • said precompressible device includes a'cap, said substance being a gaseous substance, said cap defining a space for said gaseous substance, said means for precompressing the substance including a piston closing said space in part and in contact with the gaseous substance, and means for displacing the piston to regulate the pressure of the gaseous substance in said space.
  • Apparatus according to claim 3 wherein said hammer and said precompressible device are constituted as a unitary assembly which includes a housing containing said hammer and said precompressible device.
  • said precompressible device defines a space containing said compressible substance which is a gaseous medium, said precompressing means comprising a piston bounding said space in part and in contact with the gaseous medium therein, and means for displacing the piston under the pressure of a liquid medium to regulate the pressure of the gaseous medium in said space.
  • Apparatus according to claim 16 wherein said space and piston are contained in the hammer which moves up and down, and said precompressing means includes means for regulating the pressure of said liquid medium, which acts on the piston, during each upward movement of the hammer.
  • said precompressing means comprises a valve means for controlling the supply of the liquid medium to the piston and the means for regulating the pressure of the liquid medium includes a non-return valve between said piston and the valve means for maintaining the pressure of the liquid acting on the piston at a constant value during upward movement of the hammer.
  • said assembly comprises a hollow piston fixed in said housing, said valve means being a three-way valve coupled to the hollow piston for selectively supplying the same with pressurized liquid medium or withdrawing the pressurized liquid medium, said hammer being slidably mounted on said hollow piston, said hammer having a passageway connecting the hollow piston with the movable piston via said non-return valve, said hammer having a chamber surrounding the hollow piston which is adapted for receiving the pressurized liquid medium to raise the hammer.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
US524773A 1965-02-03 1966-02-03 Method for driving piles and similar objects Expired - Lifetime US3417828A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714789A (en) * 1970-12-29 1973-02-06 Bolt Associates Inc Automatically self-regulating variable-stroke, variable-rate and quiet-operating pile driver method and system
DE2240385A1 (de) * 1971-08-23 1973-03-01 Bolt Associates Inc Verfahren zur steuerung der kraft beim eintreiben eines pfahls und geraet zur durchfuehrung des verfahrens
US3788402A (en) * 1970-12-29 1974-01-29 Bolt Associates Inc Automatically self-regulating variable-stroke, variable-rate and quiet-operating pile driver apparatus
US3797585A (en) * 1971-10-18 1974-03-19 B Ludvigson Apparatus for generating a pressure wave in an elongated body operatively connected to a drop hammer
US3991833A (en) * 1974-11-20 1976-11-16 Ruppert Robert W Pile hammer cushion apparatus
US4082032A (en) * 1974-11-13 1978-04-04 Raymond International, Inc. Control of hydraulically powered equipment
JPS5374703A (en) * 1976-12-15 1978-07-03 Takashi Takee Method and device for preventing ground from being vibrated by impact
US4098355A (en) * 1977-01-27 1978-07-04 Raymond International Inc. Underwater hammer with circumferential flow seal
US4102408A (en) * 1976-02-25 1978-07-25 Birger Ludvigson Pile driving device
US4226287A (en) * 1977-07-15 1980-10-07 Hollandsche Beton Groep N.V. Apparatus for pile driver cushion recoil
US4262755A (en) * 1977-04-15 1981-04-21 Koehring Gmbh Shock absorbing pile driver
US4362216A (en) * 1976-11-02 1982-12-07 Hollandsche Beton Groep N.V. Pile driving apparatus
US4465145A (en) * 1975-12-20 1984-08-14 Koehring Gmbh Cushioned drive cap for a pile driver
DE3336684A1 (de) * 1983-10-08 1985-05-02 Friedhelm 4390 Gladbeck Schwarz Hydraulisches schlagwerkzeug
US6257352B1 (en) 1998-11-06 2001-07-10 Craig Nelson Rock breaking device
US20040226752A1 (en) * 2001-07-02 2004-11-18 Sandvik Tamrock Oy Impact device
US20070181320A1 (en) * 2006-02-06 2007-08-09 Robert Mason Fence Post Driver and Remover
WO2020153838A1 (en) 2019-01-21 2020-07-30 Itrec B.V. Pile driving methods and systems for driving a pile
NL2023210B1 (en) 2019-03-28 2020-10-06 Itrec Bv Pile driving method and system for driving a pile.
WO2020263096A1 (en) 2019-06-28 2020-12-30 Ihc Holland Ie B.V. Pile-driver assembly and method for driving a pile into the ground
US11859532B2 (en) * 2020-11-21 2024-01-02 Alexandra Leonidovna Zhmudyak Vibratory plate and its engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660403A (en) * 1950-05-02 1953-11-24 W E Williams Posthole forming machine
US2972871A (en) * 1957-01-03 1961-02-28 Jr Edward W Foley Apparatus for driving a pile shell
US3001515A (en) * 1958-04-26 1961-09-26 Delmag Machinenfabrik Reinhold Method of driving piles
US3100382A (en) * 1959-03-26 1963-08-13 Muller Ludwig Coupler for coupling a pile member to a pile driver
US3106258A (en) * 1959-04-25 1963-10-08 Muller Ludwig Driving device for pile members
US3312295A (en) * 1965-09-23 1967-04-04 Jr Albert G Bodine Method and apparatus for fluid injection in vibratory driving of piles and the like
US3316722A (en) * 1964-09-22 1967-05-02 Union Metal Mfg Co Pile driving mandrel construction and method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660403A (en) * 1950-05-02 1953-11-24 W E Williams Posthole forming machine
US2972871A (en) * 1957-01-03 1961-02-28 Jr Edward W Foley Apparatus for driving a pile shell
US3001515A (en) * 1958-04-26 1961-09-26 Delmag Machinenfabrik Reinhold Method of driving piles
US3100382A (en) * 1959-03-26 1963-08-13 Muller Ludwig Coupler for coupling a pile member to a pile driver
US3106258A (en) * 1959-04-25 1963-10-08 Muller Ludwig Driving device for pile members
US3316722A (en) * 1964-09-22 1967-05-02 Union Metal Mfg Co Pile driving mandrel construction and method
US3312295A (en) * 1965-09-23 1967-04-04 Jr Albert G Bodine Method and apparatus for fluid injection in vibratory driving of piles and the like

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714789A (en) * 1970-12-29 1973-02-06 Bolt Associates Inc Automatically self-regulating variable-stroke, variable-rate and quiet-operating pile driver method and system
US3788402A (en) * 1970-12-29 1974-01-29 Bolt Associates Inc Automatically self-regulating variable-stroke, variable-rate and quiet-operating pile driver apparatus
DE2240385A1 (de) * 1971-08-23 1973-03-01 Bolt Associates Inc Verfahren zur steuerung der kraft beim eintreiben eines pfahls und geraet zur durchfuehrung des verfahrens
US3721095A (en) * 1971-08-23 1973-03-20 Bolt Associates Inc Controllable force method and system of driving piles
US3797585A (en) * 1971-10-18 1974-03-19 B Ludvigson Apparatus for generating a pressure wave in an elongated body operatively connected to a drop hammer
US4082032A (en) * 1974-11-13 1978-04-04 Raymond International, Inc. Control of hydraulically powered equipment
US3991833A (en) * 1974-11-20 1976-11-16 Ruppert Robert W Pile hammer cushion apparatus
US4465145A (en) * 1975-12-20 1984-08-14 Koehring Gmbh Cushioned drive cap for a pile driver
US4102408A (en) * 1976-02-25 1978-07-25 Birger Ludvigson Pile driving device
US4362216A (en) * 1976-11-02 1982-12-07 Hollandsche Beton Groep N.V. Pile driving apparatus
JPS5374703A (en) * 1976-12-15 1978-07-03 Takashi Takee Method and device for preventing ground from being vibrated by impact
US4098355A (en) * 1977-01-27 1978-07-04 Raymond International Inc. Underwater hammer with circumferential flow seal
US4314613A (en) * 1977-04-15 1982-02-09 Koehring Gmbh Pile-driving recoil damping device
US4262755A (en) * 1977-04-15 1981-04-21 Koehring Gmbh Shock absorbing pile driver
US4226287A (en) * 1977-07-15 1980-10-07 Hollandsche Beton Groep N.V. Apparatus for pile driver cushion recoil
DE3336684A1 (de) * 1983-10-08 1985-05-02 Friedhelm 4390 Gladbeck Schwarz Hydraulisches schlagwerkzeug
US6257352B1 (en) 1998-11-06 2001-07-10 Craig Nelson Rock breaking device
US20040226752A1 (en) * 2001-07-02 2004-11-18 Sandvik Tamrock Oy Impact device
US7013996B2 (en) * 2001-07-02 2006-03-21 Sandvik Tamrock Oy Impact device
US20070181320A1 (en) * 2006-02-06 2007-08-09 Robert Mason Fence Post Driver and Remover
WO2020153838A1 (en) 2019-01-21 2020-07-30 Itrec B.V. Pile driving methods and systems for driving a pile
US12123159B2 (en) 2019-01-21 2024-10-22 Itrec B.V. Pile driving methods and systems for driving a pile
NL2023210B1 (en) 2019-03-28 2020-10-06 Itrec Bv Pile driving method and system for driving a pile.
WO2020263096A1 (en) 2019-06-28 2020-12-30 Ihc Holland Ie B.V. Pile-driver assembly and method for driving a pile into the ground
US12123160B2 (en) 2019-06-28 2024-10-22 Iqip Holding B.V. Pile-driver assembly and method for driving a pile into the ground
US11859532B2 (en) * 2020-11-21 2024-01-02 Alexandra Leonidovna Zhmudyak Vibratory plate and its engine

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Publication number Publication date
NL6501373A (enrdf_load_stackoverflow) 1966-08-04

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Owner name: KOEHRING GMBH-MENCK DIVISION, WERNER-VON-SIEMENSST

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HOLLANDSCHE BETON GROEP NV A CORP. OF THE NETHERLANDS;REEL/FRAME:003990/0070

Effective date: 19820202