NL2012101C2 - Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground. - Google Patents

Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground. Download PDF

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Publication number
NL2012101C2
NL2012101C2 NL2012101A NL2012101A NL2012101C2 NL 2012101 C2 NL2012101 C2 NL 2012101C2 NL 2012101 A NL2012101 A NL 2012101A NL 2012101 A NL2012101 A NL 2012101A NL 2012101 C2 NL2012101 C2 NL 2012101C2
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Netherlands
Prior art keywords
movable mass
hydraulic
housing
providing
pipes
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NL2012101A
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Dutch (nl)
Inventor
Arend Gier
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Dieseko Group B V
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Publication of NL2012101C2 publication Critical patent/NL2012101C2/en

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    • 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

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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)

Description

Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground
The invention relates to a vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground, comprising a suspendable house in which a movable mass is provided that during use excites the unit into vibration, wherein the house is provided with a clamp that is connectable to the said pile, profile or other work-piece. The invention also relates to a method for driving or removing a pile, profile or other workpiece into or from the ground .
Such a vibratory unit and method are known from WO2013/051929. The known vibratory unit employs rotatable eccentric masses. Rotation of these masses causes that the unit will vibrate, and this vibration is used to drive the concerning workpiece into the ground or remove this workpiece from the ground. The frequency of vibration is limited by the rotational speed of the eccentric masses, which means that the operational efficiency of the known vibratory unit can be bothersome at times. To provide sufficient energy to the pile, profile or other workpiece the restricted frequency of vibration requires that rather large amplitudes of vibration are required. Another disadvantageous aspect of the known vibratory unit is that it is rather bulky.
It is an object of the invention to develop an alternative for the known vibratory unit which is less bulky, and which is suitable for application in dense areas, such as in inner cities.
It is another object of the invention to provide a vibratory unit which has improved operational efficiency.
It is still another object of the invention to provide a vibratory unit that employs lesser amplitudes of vibration .
Still another object of the invention is to provide a vibratory unit which has reduced risk of inducing damage to surrounding buildings or other objects.
These and other objects and advantages of the invention which may become apparent from the following disclosure, are attained with a vibratory unit and method for driving a pile, profile or other workpiece into the ground having the features of one or more of the appended claims.
According to a first aspect of the invention the vibratory unit is provided with a movable mass that is linearly displaceable within the house between the said house's upper and lower lids. This linearly displaceable movable mass comes in the place of the known rotatable eccentric masses of the known vibratory unit. Since according to the invention only one movable mass is required, the vibratory unit may be embodied in relatively modest dimensions.
Another aspect of the invention is that the movable mass is bidirectionally displaceable within the house. This allows that the movable mass is provided with a sinusoidal vibration or with a modified sinusoidal vibration, which is transferred to the house.
It is preferable that the movable mass is restricted in displaceability in a sideways direction that is transverse to the bidirectionally displaceability of the mass. The vibrational energy of the movable mass can thus be concentrated in the direction that best promotes the driving into the ground or removal from the ground of the concerning pile, profile or other workpiece.
Inducing movement and thus vibration to the movable mass can be arranged in many ways, however it is preferred that the movable mass delimits an upper room and lower room respectively, which rooms are arranged to receive an hydraulic fluid to exercise an hydraulic pressure on opposite sides of the movable mass. The application of hydraulic fluids for placing pressure on the movable mass is advantageous in terms of variability, rate of change of said variability and also the absolute amount of energy that can be provided to the movable mass . A beneficial arrangement of the vibratory unit of the invention has the feature that each of the house's upper and lower lids are provided with a protrusion which is ar ranged to snugly fit in a corresponding recess that is provided at a side of the movable mass that faces the concerning upper and lower lid respectively for the formation of the upper room and lower room respectively.
Further the vibratory unit of the invention is preferably provided with hydraulic piping and hydraulic valves to intermittently supply hydraulic fluid to opposite sides of the movable mass so as to induce a linear back-and-forth movement of said movable mass with respect to the house.
To enable effective control of the vibratory unit of the invention it is preferred that the hydraulic piping connects the upper room and lower room independently from each other to an hydraulic pump. Advantageously then the hydraulic valves are provided in the hydraulic piping so as to arrange that at least one hydraulic valve is provided in the piping that connects to the upper room, and at least one hydraulic valve is provided in the piping that connects to the lower room.
Suitably a control unit is provided to arrange control of the hydraulic valves for the intermittent supply of hydraulic fluid to opposite sides of the movable mass. The control unit can arrange for vibration of the moving mass as a pure sinus, but also with modifications such as a larger positive amplitude than negative amplitude, or alternatively with a larger negative amplitude than positive amplitude. The selection of the type of vibration can be made depending on the type of operation, i.e. whether the pile, profile or workpiece has to be driven into the ground or removed from the ground.
By employing the method of the invention for driving a pile, profile or other workpiece into the ground, including the steps of: -providing a suspendable house with a clamp; -providing that the clamp is connected to the said pile, profile or other workpiece; -providing a movable mass to the suspendable house; and -providing that the movable mass is linearly dis- placeable within the house, it is possible to employ relatively high frequencies of vibration of the movable mass in the range of 20 - 200 Hz. These relatively high frequencies cause that the soil is fluidized which tremendously reduces the resistance against introduction or removal of any pile, profile or workpiece into or from the ground. These advantages are particularly attainable by providing hydraulic piping and hydraulic valves to intermittently supply hydraulic fluid to opposite sides of the movable mass so as to induce a linear back-and-forth movement of said movable mass with respect to the house. It is preferred then that at least one hydraulic valve is provided in the piping that connects to an upper room with reference to the movable mass, and at least one hydraulic valve is provided in the piping that connects to a lower room with reference to the movable mass, and by providing that the hydraulic valves in the piping to the upper room and to the lower room are controlled so as to intermittently supply hydraulic fluid to opposite sides of the movable mass. In this connection it is also preferred that the upper room and the lower room connect independently from each other to the hydraulic pump for the hydraulic fluid.
The invention will hereinafter be further elucidated with reference to the drawing of a nonlimiting exemplary embodiments of a vibratory unit according to the invention.
In the drawing: -figure 1 shows a side view of the vibratory unit of the invention; -figure 2 shows a frontal cross-sectional view of the vibratory unit of figure 1; -figures 3A, 3B and 3C depict vibrational curves that can be implemented with the vibratory unit of the invention -figure 4 shows a detailed view of piping connections shown in figure 2; -figure 5 shows a detailed view of piping connections alternative to the embodiemnt shown in figure 2 and figure 4.
Whenever in the figures the same reference numerals are applied, these numerals refer to the same parts.
With reference first to figure 1 a general side view of the vibratory unit 1 of the invention is shown. Such a vibratory unit is conventionally used for driving or removing a pile, profile or other workpiece 2 (see figure 2) into or from the ground.
Figure 2 shows that the vibratory unit 1 comprises a house 3 that connects through elastomeric connectors 4 with a frame 5 that has suspension means 6 for a crane or other machine. The house 3 can thus be suspended and moved to an intended position by means of such crane or machine. The elastomeric connectors 4 arrange that the frame 5 is decoupled from the vibrations of the house 3. At the bottom of the house 3 a clamp 7 is provided for connection to the pile, profile or other workpiece 2 which has to be driven into or removed from the ground. Vibrations of the house 3 transfer directly to the clamp 7 and thus to the pile, profile or other workpiece 2 connected to the clamp 7.
To arrange that the house 3 is brought into a vibrating condition a movable mass 8 is provided that during use excites the unit into vibration. According to the invention the movable mass 8 is linearly displaceable within the house 3, in particular between the said house's upper and lower lids (3', 3''). It is thus intended that the movable mass 8 is bidirectionally displaceable within the house 3 and preferably that the movable mass 8 is restricted in displace-ability in a sideways direction that is transverse to the bidirectionally displaceability of the mass. This can be inferred from the close fit of the movable mass 8 within the house 3, except for the room to maneuver between the lids 3', 3 " .
The movable mass 8 delimits an upper room 9 and a lower room 10 respectively, which rooms 9, 10 are arranged to receive an hydraulic fluid to exercise an hydraulic pressure on opposite sides of the movable mass 8. Figure 2 shows an embodiment in which each of the house's upper and lower lids 3', 3'' are provided with a protrusion 11, 12 wherein each protrusion 11, 12 is arranged to snugly fit in a correspond- ing recess 11', 12' that is provided at a side of the movable mass 8 that faces the concerning upper and lower lid 3', 3'' respectively. The said protrusions 11, 12 together with the corresponding recesses 11', 12' in the movable mass 8 thus form the upper room 9 and lower room 10 respectively. Since the mass 8 is movable and the protrusions 11, 12 are fixed to the upper lid 3' and lower lid 3'' of the house 3, the space that is occupied by the rooms 9 and 10 is variable.
The variability of the space occupied by the rooms 9, 10 is effectively used by providing hydraulic piping 13, 13', 13'', 14, 14', 14'' and hydraulic valves 15, 16 to intermittently supply hydraulic fluid to the rooms 9, 10 that are positioned on opposite sides of the movable mass 8 so as to induce a linear back-and-forth movement of said movable mass 8 with respect to the house 3. The piping 13, 14 that connects to the house 3 is extended through the movable mass 8 and eventually through the protrusions 11, 12 that extend in the recesses 11', 12' of the movable mass 8 so as to provide a fluid connection of the rooms 9, 10 with an hydraulic pump 17 that provides the energy for moving the movable mass 8. Figure 2 and the detail view of figure 4 show that the piping 13, 14 that eventually connects to the rooms 9, 10 is provided from the sides of the house 3. Figure 5 shows an alternative embodiment wherein the piping connects to the house 3 through the upper lid 3' and (not shown) under lid 3''.
As figure 2 shows the hydraulic piping 13, 13', 13'' connects the upper room 9 independent from the hydraulic piping 14, 14', 14'' of the lower room 10 with the hydraulic pump 17. It is further shown that the hydraulic valves 15, 16 are provided in the hydraulic piping so as to arrange that at least one hydraulic valve 15 is provided in the piping 13, 13', 13'' that connects to the upper room 9, and at least one hydraulic valve 16 is provided in the piping 14, 14', 14'' that connects to the lower room 10. A control unit 18 is provided to arrange control of the hydraulic valves 15, 16 to secure the intermittent supply of hydraulic fluid to opposite sides of the movable mass 8.
The operation of the vibratory unit of the invention can be explained as follows.
In operation the movable mass 8 may be subjected to a sinus shaped linear displacement with reference to the house 3. In a first part of the sinus hydraulic fluid moves from the hydraulic pump 17 through piping 14', valve 16 and piping 14 towards the lower room 10 to lift the movable mass 8 with reference to the lower lid 3'' of the house 3. Simultaneously hydraulic fluid leaves the upper room 9 via piping 13, valve 15 and return piping 13'' towards hydraulic pump 17. By arranging that the movable mass 8 is relatively heavy, this predominantly causes the house 3 to move downwards.
After a predetermined elapsed time the valve 15 is shut off and the movable mass 8 comes to a stop. This is then followed by opening the valve 15 to enable hydraulic fluid to flow from the hydraulic pump 17 through piping 13', valve 15 and piping 13 towards the upper room 9. Simultaneously the valve 16 for the lower room 10 is switched to a position that hydraulic fluid can leave the lower room 10 through the piping 14, said valve 16, and the return piping 14''. In combination with the hydraulic fluid flowing into the upper room 9 this predominantly causes the house 3 to move upwards.
After a second predetermined elapsed time the valve 16 is shut off and the movable mass 8 again comes to a stop. This is then followed by opening the valve 16 to enable hydraulic fluid to flow from the hydraulic pump 17 through piping 14', valve 16 and piping 14 towards the lower room 10 to again lift the movable mass 8 with reference to the lower lid 3'' of the house 3. This repeats the cyclus that started with the above-mentioned first part of the sinus.
By repeatedly switching the valves 15 and 16 subject to the control of control unit 18 hydraulic fluid is intermittently supplied to the upper room 9 and lower room 10 that are located on opposite sides of the movable mass 8. This intermittent supply of hydraulic fluid than causes the movable mass 8, and hence the house 3 to move and assume a vibration that corresponds to the durations of the intermittent supply of hydraulic fluid to said rooms 9, 10.
By controlling the duration of opening respectively closing off the valves 15, 16 it is possible to manipulate the shape of the sinusoidal vibration. Figure 3A shows a pure sinusoidal vibration. Figure 3B shows a sinusoidal vibration wherein a larger negative amplitude than positive amplitude is applied. This is useful for driving a pile, profile or workpiece into the ground. Figure 3C on the other hand shows that a larger negative amplitude than positive amplitude is applied. This is preferably selected when the pile, profile or workpiece has to be removed from the ground.
Although the invention has been discussed in the foregoing with reference to an exemplary embodiment of the apparatus of the invention, the invention is not restricted to this particular embodiment which can be varied in many ways without departing from the gist of the invention. The discussed exemplary embodiment shall therefore not be used to construe the appended claims strictly in accordance therewith. On the contrary the embodiment is merely intended to explain the wording of the appended claims without intent to limit the claims to this exemplary embodiment. The scope of protection of the invention shall therefore be construed in accordance with the appended claims only, wherein a possible ambiguity in the wording of the claims shall be resolved using this exemplary embodiment.

Claims (16)

1. Trilinrichting (1) voor het drijven of verwijderen van een paal, profiel of ander werkstuk (2) in of uit de grond, omvattende een ophangbaar huis (3) in welke een beweegbare massa (8) is voorzien die tijdens gebruik de inrichting in trilling brengt, waarbij het huis (3) is voorzien van een klem (7) die verbindbaar is met genoemde paal, profiel of ander werkstuk (2), met het kenmerk, dat de beweegbare massa (8) binnen het huis (3) lineair verplaatsbaar is.A vibrating device (1) for driving or removing a pole, profile or other work piece (2) in or from the ground, comprising a suspension housing (3) in which a movable mass (8) is provided which the device during use vibrates, the housing (3) being provided with a clamp (7) connectable to said post, profile or other workpiece (2), characterized in that the movable mass (8) within the housing (3) can be moved linearly. 2. Trilinrichting (1) volgens conclusie 1, met het kenmerk, dat de beweegbare massa (8) bidirectioneel binnen het huis (3) verplaatsbaar is.Vibrating device (1) according to claim 1, characterized in that the movable mass (8) can be moved bidirectionally within the housing (3). 3. Trilinrichting (1) volgens conclusie 1 of 2, met het kenmerk, dat de beweegbare massa (8) in een zijdelingse richting beperkt in verplaatsbaarheid is welke dwars verloopt op de bidirectionele verplaatsbaarheid van de massa (8).Vibrating device (1) according to claim 1 or 2, characterized in that the movable mass (8) in a lateral direction is limited in displaceability which runs transversely to the bi-directional displaceability of the mass (8). 4. Trilinrichting (1) volgens een der voorgaande conclusies 1-3, met het kenmerk, dat de beweegbare massa (8) een bovenkamer (9) en een onderkamer (10) begrenst, welke kamers (9, 10) zijn ingericht om een hydraulische vloeistof te ontvangen voor het uitoefenen van een hydraulische druk op tegenovergelegen zijden van de beweegbare massa (8).A vibrating device (1) according to any one of the preceding claims 1-3, characterized in that the movable mass (8) defines an upper chamber (9) and a lower chamber (10), which chambers (9, 10) are arranged to receive hydraulic fluid for applying hydraulic pressure to opposite sides of the movable mass (8). 5. Trilinrichting (1) volgens een der voorgaande conclusies 1-4, met het kenmerk, dat het huis (3) boven- en onderdeksels (3', 3'') bezit die voorzien zijn van een uitsteeksel (11, 12) welke is ingericht om nauwkeurig te passen in een corresponderende uitsparing (11', 12') die voorzien is aan een zijde van de beweegbare massa (8) welke gericht is naar het desbetreffende boven- respectievelijk onderdeksel (3', 3'') voor het vormen van de bovenkamer (9) en onderkamer (10) .Vibrating device (1) according to one of the preceding claims 1-4, characterized in that the housing (3) has upper and lower covers (3 ', 3' ') which are provided with a protrusion (11, 12) which is adapted to fit accurately into a corresponding recess (11 ', 12') provided on one side of the movable mass (8) which is directed towards the respective upper and lower cover (3 ', 3' ') forming the upper chamber (9) and lower chamber (10). 6. Trilinrichting (1) volgens een der voorgaande conclusies 1-5, met het kenmerk, dat deze is voorzien van hydraulische pijpen (13, 13', 13'', 14, 14', 14'') en hydraulische kleppen (15, 16) voor het intermitterend toevoeren van hydraulische vloeistof naar tegenovergelegen zijden van de beweegbare massa (8) voor het opwekken van een lineaire heen-en-weergaande beweging van genoemde beweegbare massa (8) ten opzichte van het huis (3).Vibrating device (1) according to one of the preceding claims 1-5, characterized in that it is provided with hydraulic pipes (13, 13 ', 13' ', 14, 14', 14 '') and hydraulic valves (15) 16) for intermittently supplying hydraulic fluid to opposite sides of the movable mass (8) for generating a linear reciprocating movement of said movable mass (8) relative to the housing (3). 7. Trilinrichting (1) volgens een der conclusies 4- 6, met het kenmerk, dat de hydraulische pijpen (13, 13', 13'', 14, 14', 14'') de bovenkamer (9) en onderkamer (10) onafhankelijk van elkaar met een hydraulische pomp (17) verbinden .Vibrating device (1) according to one of claims 4 to 6, characterized in that the hydraulic pipes (13, 13 ', 13' ', 14, 14', 14 '') the upper chamber (9) and lower chamber (10) ) independently of each other with a hydraulic pump (17). 8. Trilinrichting (1) volgens conclusie 6 en 7, met het kenmerk, dat de hydraulische kleppen (15, 16) voorzien zijn in de hydraulische pijpen (13, 13', 13'', 14, 14', 14'') teneinde te bewerkstelligen dat ten minste één hydraulische klep (15) is voorzien in de pijpen (13) die in verbinding staan met de bovenkamer (9) en ten minste één hydraulische klep (16) is voorzien in de pijpen (14) die in verbinding staan met de onderkamer (10).Vibrating device (1) according to claims 6 and 7, characterized in that the hydraulic valves (15, 16) are provided in the hydraulic pipes (13, 13 ', 13' ', 14, 14', 14 '') to cause at least one hydraulic valve (15) to be provided in the pipes (13) communicating with the upper chamber (9) and at least one hydraulic valve (16) to be provided in the pipes (14) communicating stand with the lower chamber (10). 9. Trilinrichting (1) volgens een der conclusies 6- 8, met het kenmerk, dat een regeleenheid (18) is voorzien voor het verschaffen van regeling van de hydraulische kleppen (15, 16) voor het intermitterend toevoeren van hydraulische vloeistof naar tegenovergelegen zijden van de beweegbare massa (8) .Vibratory device (1) according to one of claims 6 to 8, characterized in that a control unit (18) is provided for providing control of the hydraulic valves (15, 16) for intermittently supplying hydraulic fluid to opposite sides of the movable mass (8). 10. Werkwijze voor het drijven of verwijderen van een paal, profiel of ander werkstuk (2) in of uit de grond, omvattende de stappen van: - het verschaffen van een ophangbaar huis (3) met een klem (7); - het erin voorzien dat de klem (7) verbonden is met genoemde paal, profiel of ander werkstuk (2); - het voorzien van een beweegbare massa (8) in het ophangbare huis (3), gekenmerkt door - het erin voorzien dat de beweegbare massa (8) lineair binnen het huis (3) verplaatsbaar is.A method for driving or removing a pole, profile or other work piece (2) into or out of the ground, comprising the steps of: - providing a hanging housing (3) with a clamp (7); - providing that the clamp (7) is connected to said post, profile or other workpiece (2); - providing a movable mass (8) in the suspension housing (3), characterized by - providing that the movable mass (8) is linearly movable within the housing (3). 11. Werkwijze volgens conclusie 10, gekenmerkt door erin te voorzien dat de beweegbare massa (8) bidirectioneel verplaatsbaar is binnen het huis (3).A method according to claim 10, characterized in that the movable mass (8) is bidirectionally displaceable within the housing (3). 12. Werkwijze volgens conclusie 10 of 11, gekenmerkt door het erin voorzien dat de beweegbare massa (8) in een zijwaartse richting die dwars staat op de bidirectionele verplaatsbaarheid van de massa (8) in verplaatsbaarheid beperkt is .Method according to claim 10 or 11, characterized in that the movable mass (8) is limited in displaceability in a lateral direction that is transverse to the bi-directional movability of the mass (8). 13. Werkwijze volgens een der voorgaande conclusies 10-12, gekenmerkt door het voorzien in kamers (9, 10) die in gericht zijn voor het ontvangen van een hydraulische vloeistof voor het uitoefenen van een hydraulische druk op tegenovergelegen zijden van de beweegbare massa (8).A method according to any one of the preceding claims 10-12, characterized by providing chambers (9, 10) adapted to receive a hydraulic fluid for exerting a hydraulic pressure on opposite sides of the movable mass (8) ). 14. Werkwijze volgens een der voorgaande conclusies 10-13, gekenmerkt door het voorzien in hydraulische pijpen (13, 13', 13'', 14, 14', 14'') en hydraulische kleppen (15, 16) voor het intermitterend toevoeren van hydraulische vloeistof naar tegenovergelegen zijden van de beweegbare massa (8) voor het opwekken van een lineaire heen-en-weergaande beweging van genoemde beweegbare massa (8) ten opzichte van het huis (3).A method according to any one of the preceding claims 10-13, characterized by providing hydraulic pipes (13, 13 ', 13' ', 14, 14', 14 '') and hydraulic valves (15, 16) for intermittent feeding of hydraulic fluid to opposite sides of the movable mass (8) for generating a linear reciprocating movement of said movable mass (8) relative to the housing (3). 15. Werkwijze volgens een der conclusies 13-14, gekenmerkt door het voorzien dat de kamers (9, 10) een bovenka mer (8) en een onderkamer (10) omvatten en dat genoemde kamers onafhankelijk van elkaar met een hydraulische pomp (17) in verbinding staan.A method according to any one of claims 13-14, characterized in that the chambers (9, 10) comprise an upper chamber (8) and a lower chamber (10) and said chambers independently of each other with a hydraulic pump (17) be connected. 16. Werkwijze volgens conclusie 15, gekenmerkt door het voorzien dat ten minste één hydraulische klep (15) voorzien is in de pijpen (13) die verbinding verschaffen met de bovenkamer (9), en ten minste één hydraulische klep (16) is voorzien in de pijpen (14) die verbinding verschaffen met de onderkamer (10), en door erin te voorzien dat de hydraulische kleppen (15, 16) in de pijpen naar de bovenkamer (9) en onderkamer (10) geregeld worden voor het intermitterend toevoeren van hydraulische vloeistof naar tegenovergelegen zijden van de beweegbare massa (8).A method according to claim 15, characterized in that at least one hydraulic valve (15) is provided in the pipes (13) providing connection to the upper chamber (9), and at least one hydraulic valve (16) is provided in the pipes (14) providing connection to the lower chamber (10), and by providing that the hydraulic valves (15, 16) in the pipes are controlled to the upper chamber (9) and lower chamber (10) for intermittently supplying hydraulic fluid to opposite sides of the movable mass (8).
NL2012101A 2014-01-17 2014-01-17 Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground. NL2012101C2 (en)

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NL2012101A NL2012101C2 (en) 2014-01-17 2014-01-17 Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground.

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NL2012101A NL2012101C2 (en) 2014-01-17 2014-01-17 Method and vibratory unit for driving or removing a pile, profile or other workpiece into or from the ground.

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051929A1 (en) * 2011-10-06 2013-04-11 Dieseko Group B.V. Vibratory Pile Driver and Method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013051929A1 (en) * 2011-10-06 2013-04-11 Dieseko Group B.V. Vibratory Pile Driver and Method

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