Vibratory pile driving assembly

Abstract

A vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising: - a base element having a first connection member; - a second connection member; - at least two clamping devices arranged to clamp an end of a pile; - at least two vibrator devices releasably connected to the second connection member of the base element and spaced apart from each other, each vibrator devices arranged to oscillate a pile clamped by the clamping device; and - a lifting device rotatably connected to the second connection member of the base element, which is at a parallel axis of the axis of the first connection member, and wherein the lifting device comprises at least a lifting arm comprises a dampening element arranged to at least partially reduce the transmission of vibrations caused by the at least two vibrator devices to the lifting device.

Description

[0001] P138648PC00

[0002] Title: Vibratory pile driving assembly

[0003] TECHNICAL FIELD

[0004] The various aspects and examples thereof relate to a vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground.

[0005] Moreover, the invention also relates to a method for driving a pile into the ground by using the vibratory pile driving assembly. Additionally, the invention relates to a method for extracting a pile out of the ground by means of using the vibratory pile driving assembly.

[0006] BACKGROUND

[0007] Vibratory pile driving apparatus are widely used in the construction industry to drive or extract piles, sheet piles, or other structural elements into or out of the ground through the application of vibrational forces. The vibratory mechanism generates high-frequency vibrations that cause the pile clamped to the vibratory pile driving apparatus to oscillate. The oscillation of the pile causes the soil resistance around the pile to be significantly reduced, facilitating easier and more efficient insertion or extraction of the pile compared to traditional methods like impact hammers, while the amount of noise is heavily reduced.

[0008] In various vibratory pile driving apparatus designs, an upending arm is utilized to aid in the positioning of piles. Typically, piles are transported and initially laid out in a horizontal position, and the upending arm functions to rotate or pivot the pile from this horizontal orientation to a vertical one, which is necessary for driving it into the ground. The lifting or upending arm is generally mounted to a base frame or support structure that houses the vibratory motor and associated components. An example of such an apparatus is disclosed in the PCT application WO2023131623A1.

[0009] This prior art document discloses a vibratory pile driving apparatus wherein the lifting arm is connected to the base frame. In such configuration, the lifting arm operates through hydraulic or mechanical actuation, allowing it to pivot or rotate piles into the correct orientation. The rigid connection of the lifting arm to the base frame often results in the transmission of vibratory forces from the vibratory pile driving apparatus to the lifting arm and, consequently, to the crane. This is due to the specific configuration of the lifting arm. Since the vibrators are mounted on the base frame, the connection to the base frame makes the base frame to move excessively or vibrate when the vibrators are actuated. As a result, the lifting arm dimensions need to be of such a magnitude that thedimensions of the whole apparatus become large, while the driving force does not surpass of those of smaller dimensions.

[0010] Moreover, the dimensions of the whole vibratory pile driving apparatus of the prior art document result in a structure of a relatively large width. This adds extra burden to the stabbing and lifting operations, especially during the latter wherein the crane has to take an active role when lifting the vibratory pile driving apparatus, more especially when upending the pile.

[0011] Furthermore, the lifting arm described in this prior art document is widely spread around the vibrator devices, which results in having a relatively large base frame to accommodate all components connected thereto. The large, and thus relatively heavy components, may cause undue wear of the components of the vibratory pile driving apparatus according to the prior art. As a result, parts experiencing this wear, e.g. bearings, will need to be replaced often.

[0012] Additionally, the prior art apparatus has a relatively low center of gravity when driving a pile into the ground resulting in less efficient use of the downward force, as the downward force has a relatively small arm. This may affect how the vibrations are transmitted through the monopile, reducing the efficiency of the energy transferred from the apparatus to the monopile. This, on its turn, may slow down the process of driving the monopile in the ground. A lower center of gravity may also cause additional while wear and tear may occur since there might be an uneven distribution. Furthermore, since the center of gravity is relatively low, the aligning the apparatus with the pile is more tedious than when the center of gravity is higher, since a higher center of gravity may aid in keeping the pile vertical, especially if the setup compensates for lateral stability through the assembly.

[0013] SUMMARY

[0014] The various aspects and examples aim to counteract the above disadvantages, preferably while retaining the advantages. More specifically, the various aspects and examples aim to provide a vibratory pile driving assembly that is able to overcome or reduce the above-mentioned problems and to provide a vibratory pile driving assembly for effectively driving a pile into the ground and / or extracting a pile out of the ground.

[0015] A first aspect provides a vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground. The assembly comprises a base element having a first connection member. The assembly further comprises a second connection member and at least two clamping devices arranged to clamp an end of a pile. The assembly further comprises at least two vibrator devices releasably connected to the first connection member of the base element. The vibrator devices are spaced apart fromeach other. Each vibrator device of the at least two vibrator devices is arranged to oscillate a pile clamped by the clamping device. The assembly further comprises a lifting device rotatably connected to the second connection member. The lifting device comprises at least a lifting arm having a dampening element arranged to at least partially reduce the transmission of vibrations caused by the at least two vibrator devices to the lifting device. The present invention effectively reduces vibrations transmitted to a lifting arrangement, such as a crane, from the at least two vibrator devices by placing the dampening element on the lifting arm.

[0016] Advantageously, by providing the dampening element on the lifting arm a configuration has been provided that has a reduced complexity while simultaneously having a reduced weight compared to conventional vibratory pile driving assemblies. The reduced complexity and weight reduction may be attributed to the fact that due to the efficient reduction of transmitted vibrations towards the lifting arrangement, a more compact vibratory pile driving assembly may be provided. Furthermore, this allows for a versatile configuration, e.g. structure, wherein a lifting device may be provided that is less tall, i.e. has a smaller height, than the lifting devices of conventional vibratory pile driving assemblies, while allowing a modular arrangement to be built within the lifting arm. The reduced size, reduced complexity and the significant weight reduction allow for the vibratory pile driving assembly according to the various aspects and examples to be moved and stored more easily, especially when the vibratory pile driving assembly is transported to an offshore location. Additionally, the reduced weight of the lifting device may result in a higher center of gravity, compared to the center of gravity of conventional vibratory pile driving assemblies. This may allow for less energy consumption during use relative to known vibratory pile driving assemblies, causing the vibratory pile driving assembly to be more energy efficient during operation.

[0017] Furthermore, by providing a vibrator devices that are releasably connected to the base element, a modular vibratory pile driving assembly may be provided. This may allow for a varying amount of vibrator devices to be provided, depending on the application. For example, a large monopile may require a large number of vibrator devices compared to a smaller monopile to facilitate efficient driving of the pile into the ground. Furthermore, by having the vibrator devices releasably connected to the base element, they may be conveniently removed and exchanged in case of a defect or maintenance.

[0018] A vibratory pile driving assembly is an assembly arranged to drive a pile into the ground or extracting a pile out of the ground. The pile may be a monopile, i.e. a single pile that acts as the foundation for the structure placed on top of said pile. As a result, since only a single pile is used, the pile has a relatively large diameter compared to non-monopiles. In particular, the vibratory pile driving assembly may be used to drive a pile into the ground, or extracting a pile out of the ground, wherein the ground is at least partially submerged in a body of water. A body of water may be a lake, a river, a water way, a sea or an ocean. It will however be clear that a vibratory pile driving assembly may also be used outside a body of water.

[0019] In the context of the invention, it will be understood that clamping is any method of releasably and controllably connecting the pile to the clamping device. For example, this may comprise grabbing the pile by at least partially circumventing the outer contour of a pile on opposite ends of the circumference of the pile and providing a radially inward force such that the pile remains attached to the clamping device when the clamping device lifts the pile. Alternatively, in case the pile is a hollow pile having a circumferential wall, the clamping device may locally grab the circumferential wall on the outside and inside of the circumferential wall.

[0020] Preferably, the clamping device may grab the circumferential wall at multiple locations of the circumferential wall such as to better spread the force applied by the pile when being lifted on both the clamping locations and on the clamping device As an even further example of clamping, the clamping device may be inserted in a hollow pile and afterwards extending radially outward such that the clamping device exerts a radially outward force on the inside of the hollow pile, thereby releasably fixing the clamping device to the pile. Clamping the pile at an end may allow for upending the pile and / or moving the pile around, for example by lifting the base element using a crane or lifting device. The pile may comprise features that make it more convenient to facilitate clamping, such as a flange provided on the pile, for example around the circumference of the pile.

[0021] The dampening element provided in the lifting arm at least partially reduces the vibrations caused by the at least two vibrator devices to the lifting device should be understood as providing a dampening function such that, away from the at least two vibrator devices, the vibrations are at least partially and at least locally reduced due to the dampening element. In this context, away should be understood in the lifting arm at a distance from the vibrator devices, e.g. at a distal end such as an upper end of the lifting arm.

[0022] In an implementation of the vibratory pile driving assembly, the second connection member is attached to the base element. The first connection member and the second connection member are provided transverse relative to each other. This may facilitate a compact but durable configuration.In an implementation of the vibratory pile driving assembly, the second connection member is attached to the at least two vibrator devices. This may further reduce the transmission of vibrations to the lifting device.

[0023] In an implementation of the vibratory pile driving assembly, the at least two vibrator devices are provided parallel to each other. This configuration may result in an effective and compact design, allowing the vibrator devices to be synchronized such that destructive interference and unwanted vibrations, e.g. parasitic vibrations, may be reduced. This may increase the lifetime of the vibratory pile driving assembly while also reducing noise pollution.

[0024] In an implementation of the vibratory pile driving assembly, the at least two clamping devices are connected to each of the at least two vibrator devices via the base element. This alternative embodiment may facilitate vibration suppression and may provide for a compact design.

[0025] In an implementation of the vibratory pile driving assembly, the at least two vibrator devices are provided at an angle relative to each other, preferably while the at least two clamping devices are connected to each of the at least two vibrator devices. This provides a very compact design of the assembly, which enables easy repair of the assembly, as less intermediary parts are needed within the assembly.

[0026] In another implementation of the vibratory pile driving assembly, the lifting device is arranged to be rotated relative to the base element such as to move the assembly between a first position, wherein a vertical axis of the lifting device is substantially parallel to a longitudinal axis of the pile, and a second position wherein the vertical axis of the lifting device is substantially perpendicular to the longitudinal axis of the pile.

[0027] Advantageously, by providing a lifting device that is arranged to rotate relative to the base element, efficient positioning of the lifting assembly, and specifically the at least two clamping devices, relative to the pile may be facilitated. When the pile is in a horizontal position, e.g. the stabbing position, the vibratory pile driving assembly may effectively rotate such that the assembly can be stabbed into the pile to upend it.

[0028] During upending of the pile, e.g. when moving the pile to a vertical position, the lifting arm is arranged to rotate the vibratory lifting assembly to a vertical lifting position. Due to the location of the dampening element in the lifting arm, the dampening element is in direct line with for example the crane, allowing to at least partially dampen vibrations or movements such that upending the pile can be done safely. Furthermore, stresses, such as shear stress and strain, when upending may be reduced in at least some of the various components of the vibratory pile driving assembly, reducing wear and thus increasing the lifetime of said components.In a further implementation of the vibratory pile driving assembly, the lifting device comprises a lifting arm having a static part and a dynamic part, wherein the dampening element is provided in between the static part and the dynamic part. During upending of the pile, or when laying the pile down, the dynamic part of the lifting arm experiences most of the dynamic stresses, while the static part experiences a relatively continuous stress. By providing the dampening element in between the static part and the dynamic part, the sidedoad, e.g. shear stress, during the upending process on the static part may be reduced.

[0029] In again another implementation of the vibratory pile driving assembly, the lifting device comprises a housing having a wall element, wherein the dampening element is securely connected to the wall element. Advantageously, this allows for the dampening element to be securely connected to the lifting device, such that during upending or laying down of the pile, or any other operations in which high loads are involved, the stresses transmitted towards the crane, or other lifting arrangement for lifting the vibratory pile driving assembly, are limited as these forces are at least partially mitigated by the housing while vibrations caused by the movement of the pile are partially dampened by the dampening elements.

[0030] In yet a further implementation of the vibratory pile driving assembly, the lifting device comprises a pair of plates arranged parallel to each other, and wherein the dampening element is provided in between facing surfaces of the pair of plates. The dampening element may be provided such that it is securely connected to at least one plate of the pair of plates, said at least one plate forming a wall element, wherein the pair of plates at least partially encapsulating a dampening element. This configuration may be particularly compact while still sufficiently dampening the vibrations transmitted to the lifting arm by the at least two vibrator devices. Additional plates, or wall elements, may be provided such as to cover the dampening element as an enclosing housing. This may increase the lifetime of the dampening element, as the dampening element may thus be protected from external influences such as the weather or impact from debris.

[0031] In yet a further implementation of the vibratory pile driving assembly, each of the at least two vibrator devices comprise a connection element. The lifting arm is attached to the at least two vibrator devices via the connection element. This configuration allows for a more accessible lifting arm, allowing for the vibratory pile driving assembly to be relatively quickly adjusted, e.g. the position of the vibratory pile driving assembly relative to a crane or other lifting arrangement, as opposed to having to reposition the complete vibratory pile driving assembly relative to the crane or other lifting arrangement.In yet a further implementation of the vibratory pile driving assembly, the connection element comprises an upstanding member having a hinge point arranged to rotatably connect the lifting arm to each of the at least two vibrator devices. This may even further improve the speed and convenience in which the vibratory pile driving assembly may be adjusted relative to the crane or other lifting arrangement, thus further reducing the total time needed to drive a pile or extract a pile from the ground.

[0032] In yet a further implementation of the vibratory pile driving assembly, the dampening element comprises a shock absorbing material arranged to deform during use, preferably an elastomeric material. Since the dampening element is provided in the lifting arm the dampening element does not rotate relative to the lifting arm when a pile is upended or laid down. As a result, the dampening element is only loaded in the axial direction of the lifting arm and does not experience significant, or any, transversal or shear loading. This may be in particular advantageous in case the shock absorbing material is an elastomeric shock absorbing material, as such a material may prove to cope with axial loading well.

[0033] In yet a further implementation of the vibratory pile driving assembly, the dampening element comprises a suppressor actuator arranged to be controllably activated, and wherein the suppressor actuator is arranged to expand and retract to dampen vibrations such as to at least partially reduce the transmission of vibrations caused by the at least two vibrator devices to the lifting device. This may be done by setting the suppressor actuator to a predetermined dampening position, such that a known amount of vibrations is dampened. Advantageously, this may allow the suppressor actuator to reduce the risk of sudden movements of the pile during upending, lifting or laying down the pile as sudden movements may damage either the pile or the surroundings of the pile.

[0034] The suppressor actuator may automatically adjust the amount of dampening provided, based on vibration data fed to the suppressor actuator. This data may be fed directly from the vibrator device or may be fed to by a sensor provided on the assembly. Using a sensor, a feedback loop may be used such that when the amounts of vibrations caused by the vibrator device increases, this is measured using the sensor and the suppressor actuator in response increases its dampening capacity and vice versa. Such a vibration suppressor device may be used to control the amount of suppression provided by selectively engaging each of a plurality of vibration suppressing components, e.g. an elastomeric shock absorbing material. In an expanded state, a minimal amount of vibration suppression is provided. However, when the suppressor actuator is adjusts to a retracted state, the shock absorbing capacity increases incrementally as more vibration suppressing components are used to dampen the vibration. In the retracted state, the maximum amountof vibration suppressing components is engaged, resulting in a maximum amount of vibration suppression provided by the suppressor actuator.

[0035] In yet a further implementation of the vibratory pile driving assembly, the lifting device comprises a lifting arm driving device arranged to angularly displace the lifting arm with respect to the base element and / or the at least two vibrator devices. The lifting arm driving device can be a hydraulic piston, which may be remotely controlled to expand and contract. In an expanded position, the lifting arm may be in line with a pile during use. In other words, a longitudinal axis of the lifting arm may be parallel to a longitudinal axis of a pile. In a retracted position, the lifting arm forms an angle with the pile during use, for example an angle of 90 degrees. In other words, the longitudinal axis of the lifting arm is not parallel to the longitudinal axis of the pile.

[0036] By having the lifting arm driving device control the angle between the lifting arm and the base element, it may be that external forces acting upon the lifting arm and / or the base element determine the angle between the lifting arm and the base element. Additionally, this may allow for determination of an expected angle between the lifting arm and the base element and / or as a way of determining faulty operation. For example, if a pile to be raised is stuck in a horizontal position and a lifting device is attempting to lift said pile using the assembly, the resulting forces of simultaneously raising the assembly while the pile is stuck prevents the lifting arm driving device from manipulating the angular displacement. Thus, such an embodiment may improve controllability and accuracy when upending and / or extracting a pile.

[0037] In yet a further implementation of the vibratory pile driving assembly, the lifting arm driving device comprises an upending mechanism arranged to move the assembly from a stabbing position, wherein the pile is in a horizontal position, into a vertical lifting position, wherein the pile is being upended by the assembly. The upending mechanism may comprise an actuator arranged to move the assembly from a stabbing position to the vertical lifting position. The actuator may be a hydraulic actuator to move the assembly from the stabbing position to the vertical lifting position by extending or contracting. Such an upending mechanism may allow the lifting arm driving device to accurately control the angle between the lifting arm and the base element.

[0038] In yet a further implementation of the vibratory pile driving assembly, the assembly comprises a sensor arranged to measure the angular position of the base element relative to the lifting arm. Such a sensor may be used to, but not limited to, monitor the upending process, the driving process or the removal process. Any abnormalities, e.g. an unexpected angular position of the base element relative to the lifting arm, may be detected using said sensor such that appropriate action, e.g. corrective action, may be taken. In casethe assembly comprises a lifting arm driving device, such a device may be used as a sensor, or the sensor may be integrated into the lifting arm driving device.

[0039] In yet a further implementation of the vibratory pile driving assembly, the assembly further comprises an inclination sensor arranged to measure the assembly and / or the pile inclination when the assembly is in use. Comparable to the sensor arranged to measure the angular position of the base element relative to the lifting arm, said inclination sensor may be used to detect abnormalities during use of the assembly, e.g. the inclination of the pile.

[0040] In yet a further implementation of the vibratory pile driving assembly, the lifting device comprises a crane connection tool at an upper end of the lifting device. The crane connection tool may facilitate releasably connecting the vibratory pile driving assembly to a crane or a lifting arrangement arranged to lift the vibratory pile driving assembly together with, or without, the pile. Opposite the upper end of the lifting device, the lifting device may be connected to the at least two vibrator devices. The dampening element is provided in the lifting arm of the lifting device between the at least two vibrator devices and the crane connection tool such that the vibrations caused by the at least two vibrator devices are reduced at the connection tool compared to the vibrations at the opposite end of the lifting device, where the lifting arms are connected to the vibrator devices.

[0041] In yet a further implementation of the vibratory pile driving assembly, the crane connection tool comprises a hoisting element to connect the vibratory pile driving assembly to a crane. For example, a ring may be provided on the lifting arm to which a hook can be attached. The hoisting element may advantageously facilitate a relatively convenient releasable connection between the assembly and a crane and allow the assembly to be used with various crane types.

[0042] In yet a further implementation of the vibratory pile driving assembly, the at least two clamping devices comprise a displacement mechanism for moving the clamping device in a linear direction. Moving the displacement mechanism in a linear direction, e.g. in a straight line parallel to the first connection member of the base element, may allow the assembly to adjust to different diameters of piles. When the clamping device comprises multiple clamping units, it may be possible to move each clamping unit individually in a linear direction or as a group. As a result, the vibratory pile driving assembly may be adapted to different diameters and types of piles, allowing for greater operational flexibility as a single assembly may be used on a wide range of piles. Additionally, this configuration may allow to have a relatively small clamping device compared to clamping devices that have a displacement mechanism moving the clamping device in a nondinear direction.Such a displacement mechanism that allows a movement of the clamping device in a linear direction may provide the possibility to move the clamping device in such a way that the connection with the pile may be done when at least a part of the clamping device is outside the pile, e.g. outside a ring or flange of the pile. This may allow the assembly to clamp piles of various geometries, and ensuring a secure grip of an individual clamping unit of an uneven or slightly deformed pile. This may allow for fast adjusting of the clamping mechanism relative to the pile, which may result in less downtime between driving or extracting various pile types, improving operational efficiency.

[0043] In yet a further implementation of the vibratory pile driving assembly, the each of the clamping devices comprise a first member, second member and an actuator, wherein the actuator is operably connected to the first member, such that when the actuator drives the first member in a first direction, the second member moves in a second direction, wherein the first direction and second direction are perpendicular to each other. Movement of the second member in the second direction because of movement of the first member in the first direction may be facilitated by having interfacing surfaces between the first and second direction. Said at least one of the interfacing surfaces may be provided at an angle such that when the first member is moved in first direction, e.g. a horizontal direction, the second member is pushed in the second direction, e.g. a vertical direction, by the angled interfacing surface.

[0044] Advantageously, such the at least two clamping devices may facilitate pretensioning of the pile such that a substantially even clamping pressure may be by the clamping device to the pile. An even clamping pressure may reduce the risk of damage to the pile compared to conventional clamping devices wherein the clamp connection may be too loose, i.e. not sufficient clamping pressure, or too tight, i.e. too much clamping pressure. As a further advantage, such at least two clamping devices may be provided relatively compact as the actuator only needs to drive in the first direction in a direction perpendicular to the longitudinal direction of a pile. A relatively small actuator may result in the clamping device being less prone to failure, since the nature of the vibrations in the vibratory pile driving assembly can affect larger actuators, such as vertical actuators moving in a direction parallel to a longitudinal axis of a pile.

[0045] For example, a section of the pile to be clamped, e.g. a flange of the pile, is provided in between the first member and a fixed component. The flange of the pile is provided below the first member, the second member is provided above the first member and has limited space to move further upward. Both the first and second member have an angled interfacing surface facing the other member. When moving in the first member in the first direction, the first member comes in to contact with the flange and the secondmember while pushing the second member upward. Due to the angled surfaces, the second member is slowly pressed upwards. The members are provided such that the first member comes in to contact with the pile before the second member can no longer move further upward. Thus, the pile is being pre-tensioned. When the first member is further moved in the first direction, the force provided by the first member on the flange remains limited as long as the second member still has room to move upward. However, once the second member can no longer move upward, further movement in the first direction causes the first member to press downward, causing a force on the flange of the pile such that the pile is clamped between the first member and the fixed component.

[0046] In yet a further implementation of the vibratory pile driving assembly, the clamping device further comprises a first clamp body and a second clamp body moveably connected to the base element or to each of the at least two vibrator devices, such that the first clamp body and the second clamp body are moveable between the first position wherein the first clamp body and the second clamp body are extended, and a second position wherein the first clamp body and the second clamp body are retracted such that the first clamp body and the second clamp body clamp the end of a pile.

[0047] The first clamp body and the second clamp body may be provided on opposite sides of a wall of a pile or on opposite sides of a flange of a pile in the clamping direction such that the wall of the pile or the flange of the pile is clamped between the first clamp body and the second clamp body. Allowing pre-tensioning on both sides of the wall of a pile, or the flange of a pile, allows for greater control and may allow for even more effective pretensioning, for example in case of a locally deformed pile.

[0048] Alternatively, the first clamp body may be provided on a first side of the base element while the second clamp body is provided on a second side of the base element. Providing multiple clamping bodies around the circumference of the pile, during use, may allow for further spreading of the clamping pressure provided over the pile. This may further reduce the chance of damaging the pile. In both examples, the first clamp body and the second clamp body may be provided having a first and a second member such as to pretension the pile or only one of the first clap body and the second clamp body may comprise a first and a second member for pre-tensioning.

[0049] In yet a further implementation of the vibratory pile driving assembly, each of the at least two vibrator devices comprises a driving system and a number of sets of eccentric masses, wherein each of the number of sets of eccentric masses are rotatably mounted on a corresponding vibrator device, and wherein the driving system is arranged to drive each set of eccentric masses of the number of sets of eccentric masses of the corresponding vibrator device individually, such that an eccentric moment of each set ofeccentric masses of the number of sets of eccentric masses of the corresponding vibrator device is rotatably controllable by a driving force applied by the driving system.

[0050] Advantageously, by controlling a number of sets of eccentric masses in a vibrator device, the eccentric moment of a vibrator device may be controlled per set of eccentric masses. When a plurality of sets of eccentric masses is provided, i.e. by having a number larger than 2, each of the sets may be driven at the same frequency, by driving them at the same rotational speed by the driving system, or at a different frequencies by driving them at different speeds by the driving system. A larger driving force would correspond to a larger result in a higher frequency and vice versa. When the plurality of sets of eccentric masses are driven in phase with each other the total eccentric moment, which may be understood as the amplitude of the vibration caused by a corresponding vibratory device, is at a maximum.

[0051] When a smaller eccentric moment is needed, e.g. in order to prevent damage to the pile, the sets can be driven out of phase, e.g. at an angle of 90 degrees relative to each other. Furthermore, providing multiple sets of eccentric masses that may each be driven individually may result a vibrator device comprising the multiple sets to produce high frequency vibrations without the need for mechanically connecting the multiple sets, significantly reducing the complexity of the system resulting in a more efficient assembly. As an example, when the eccentric masses rotate in symmetry, 100% of the eccentric moment is provided by the vibrator devices, while if the eccentric masses rotate 180 degrees out of phase, 0% of the eccentric moment is provided.

[0052] In a further advantage, having a number of sets of eccentric masses may allow for a compact design and may allow for the vibrator devices to start and stop without generating low frequency vibrations, which may cause damage to the surrounding of the vibrator device such as the crane and a supporting assembly such as a vessel or rig.

[0053] Furthermore, this may provide for control over the vibratory frequency of each of the vibrator devices, such that it is possible to fine-tune the force with which the pile is vibrated to the driving conditions, e.g. the soil conditions or characteristics of the pile.

[0054] A vibratory pile driving assembly having a number of sets of eccentric masses may be considered an improved alternative for vibrator devices with a variable eccentric moment, which have the number of sets of eccentric masses mechanical connected. The eccentric moment may be adjusted by changing the weights of the eccentric masses using a mechanical device inside the vibrator device. A disadvantage is that changing the weights of the eccentric masses causes extensive wear, that may require significant maintenance, compared to the vibrator device as described.In yet a further implementation of the vibratory pile driving assembly, the number of sets of eccentric masses of a vibrator device of the at least two vibrator devices comprises an even number of sets of equally eccentric masses, and wherein the even number of sets of equally eccentric masses have a horizontal and / or vertical configuration.

[0055] A second aspect provides for a mmethod for driving a pile into the ground, comprising the steps;

[0056] a) providing a vibratory pile driving assembly, preferably the pile driving assembly previously described, comprising a lifting device connected to the at least two vibrator devices, wherein the at least two vibrator devices are spaced apart from each other, and wherein the lifting device comprises at least a lifting arm comprising a dampening element;

[0057] b) centering the vibratory pile driving assembly with respect to the pile, c) connecting each of the at least two clamping devices to an open end of the pile, when the pile is in horizontal position, while controlling the angular position of the clamping device with respect to the lifting arm,

[0058] d) upending the pile at a lift point on the lifting arm,

[0059] e) lifting the pile, and

[0060] 1) vibratory driving the pile into the soil.

[0061] Advantageously, driving a pile into the ground using a vibratory pile driving assembly as described above, may allow for a cost-effective method of driving a pile while simultaneously having a reduced environmental impact compared to conventional pile driving assemblies. This is due to the relatively small vibratory pile driving assembly compared to conventional pile driving assemblies while still being capable of driving or extracting a comparably sized pile. Simultaneously, the vibratory pile driving assembly may be used to upend and lift a pile from a stored location, or horizontal position, to the pile driving location without the need of additional tools. The use of the vibratory pile driving assembly as described may also be beneficial as less deck space may be required when operations are performed offshore since no other tools are needed and deck space may be saved. Said deck space may be used for other purposes or to load more piles, further improving efficiency of the pile driving operation.

[0062] In an implementation of the method for driving a pile into the ground, the method further comprises between the step e) and 1) the step of positioning the pile at target location.

[0063] A third aspect provides for a method for extracting a pile out of the ground, comprising the steps;

[0064] a) providing a vibratory pile driving assembly as previously described,b) centring the pile upending device with respect to the pile to be extracted out of the ground,

[0065] c) connecting each of the at least two clamping devices to an open end of the pile, d) vibrating the pile, such that the pile becomes loose and can be extracted. The advantages of the method of extracting the pile out of the ground using the vibratory pile driving assembly as previously described are comparable to that of the method of driving the pile, e.g. a more efficient process due to the reduced size of the vibratory pile driving assembly compared to the known pile driving assemblies.

[0066] In an implementation of the method for extracting a pile out of the ground, the method further comprises the step:

[0067] - down-ending the pile, such that the pile is changed from vertical orientation to horizontal orientation.

[0068] In a fourth aspect there is provided for a vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising:

[0069] - a vibrator device mounted within a vibrator device housing;

[0070] - a suppressor device;

[0071] - at least two clamping devices configured to engage with a pile;

[0072] - wherein the clamping device comprises a displacement mechanism for moving the clamping device in a linear direction; and

[0073] - wherein the clamping device further comprises a first member, a second member and an actuator, wherein the actuator is operably connected to the first member, such that when the actuator drives the first member in a first direction, the second member moves in a second direction, wherein the first direction and second direction are perpendicular to each other.

[0074] Movement of the second member in the second direction because of movement of the first member in the first direction may be facilitated by having interfacing surfaces between the first and second direction. Said at least one of the interfacing surfaces may be provided at an angle such that when the first member is moved in first direction, e.g. a horizontal direction, the second member is pushed in the second direction, e.g. a vertical direction, by the angled interfacing surface.

[0075] Advantageously, such at least two clamping devices may facilitate pretensioning of the pile such that a substantially even clamping pressure may be by the clamping device to the pile. An even clamping pressure may reduce the risk of damage to the pile compared to conventional clamping devices wherein the clamp connection may be too loose, i.e. not sufficient clamping pressure, or too much, i.e. too much clampingpressure. As a further advantage, such the at least two clamping devices may be provided relatively compact as the actuator only needs to drive in the first direction in a direction perpendicular to the longitudinal direction of a pile. A relatively small actuator makes the clamping device less prone to failure, since the nature of the vibrations in the vibratory pile driving assembly can affect larger actuators, such as vertical actuators moving in a direction parallel to a longitudinal axis of a pile.

[0076] For example, a section of the pile to be clamped, e.g. a flange of the pile, is provided in between the first member and a fixed component. The flange of the pile is provided below the first member, the second member is provided above the first member and has limited space to move further upward. Both the first and second member have an angled interfacing surface facing the other member. When moving in the first member in the first direction, the first member comes in to contact with the flange and the second member while pushing the second member upward. Due to the angled surfaces, the second member is slowly pressed upwards. The members are provided such that the first member comes in to contact with the pile before the second member can no longer move further upward. Thus the pile is being pre-tensioned. When the first member is further moved in the first direction, the force provided by the first member on the flange remains limited as long as the second member still has room to move upward. However, once the second member can no longer move upward, further movement in the first direction causes the first member to press downward, causing a force on the flange of the pile such that the pile is clamped between the first member and the fixed component.

[0077] In an implementation of the vibratory pile driving assembly, the clamping device further comprises a first clamp body and a second clamp body moveably connected to the first connection member of the base element, such that the first clamp body and the second clamp body are moveable between the first position wherein the first clamp body and the second clamp body are extended, and a second position wherein the first clamp body and the second clamp body are retracted such that the first clamp body and the second clamp body clamp the end of a pile.

[0078] The first clamp body and the second clamp body may be provided on opposite sides of a wall of a pile or on opposite sides of a flange of a pile in the clamping direction such that the wall of the pile or the flange of the pile is clamped between the first clamp body and the second clamp body. Allowing pre-tensioning on both sides of the wall of a pile, or the flange of a pile, allows for greater control and may allow for even more effective pretensioning, for example in case of a locally deformed pile.

[0079] Alternatively, the first clamp body may be provided on a first side of the base element while the second clamp body is provided on a second side of the base element.Providing multiple clamping bodies around the circumference of the pile, during use, may allow for further spreading of the clamping pressure provided over the pile. This may further reduce the chance of damaging the pile. In both examples, the first clamp body and the second clamp body may be provided having a first and a second member such as to pretension the pile or only one of the first clap body and the second clamp body may comprise a first and a second member for pre-tensioning.

[0080] In another implementation of the vibratory pile driving assembly, the first member and second member each comprise an interfacing surface, wherein the interfacing surface of the first member and the interfacing surface of the second member are angled relative to a bottom surface and top surface of the corresponding first member and second member respectively. The first member and second member can be moved with respect to one another, such that the first and second member move from the first position to the second position. The bottom surface and top surface of the first member and second member are in contact with the pile and / or the first connection member of the base element. Having angled surfaces may allow perpendicular movement in the first direction and second direction of the first member and second member respectively while only needing to drive one of the members in a direction. For example, when the first member is driven in the first direction, a horizontal direction, the angled interface surfaces may cause the second member to move in the second direction, in a vertical direction. Such a configuration may advantageously provide a relatively simple mechanism for pre-tensioning the pile by the clamping device. This may reduce the complexity of maintenance and / or of replacing components.

[0081] In yet another implementation of the vibratory pile driving assembly, the clamping device comprises a lever system having a rotational point about which the lever system rotates for operating the clamping device. A lever system may be used to operate the clamping device from a central, or remote, position on the vibratory pile driving assembly. This may be in particular be advantageous when the clamping device comprises a plurality of clamping units, e.g. pairs of first clamp bodies and second clamp bodies, provided around the circumference of a pile during use.

[0082] In again another implementation of the vibratory pile driving assembly, the lever system comprises a first lever element connected to the clamping device; a second lever element connected to an actuator; and wherein the actuator is configured to move the second lever element to cause the first lever element to retract the clamping device.

[0083] Multiple first lever elements may be connected to a single actuator, and multiple second lever elements may be connected to a first lever element and a corresponding clamping unit of the clamping device. By operating the actuator, all the clamping device may be expandedand retracted simultaneously. Such a design may be relatively compact, allowing for a compact clamping device.

[0084] In yet a further implementation of the vibratory pile driving assembly, the assembly further comprising a control system configured to operate the displacement mechanism to retract the clamping device. Such a control system may be used to program the operation of the clamping device, e.g. to control the movement of the clamping device. Once the operation of the clamping device is programmed, the clamping device may have an expected movement, e.g. a signal may be send by the clamping device to retract the clamping device. If then the control system is arranged to measure the position of the clamping device, it may also compare the actual position of the clamping device, e.g. expanded, to an expected position of the clamping device, e.g. retracted. Differences between the expected position and actual position may be an indication of unexpected behaviour of the vibratory pile driving assembly, e.g. due to faulty components or obstacles. These differences may than be used to prevent, possibly further, damage, e.g. by stopping the driving of the actuator for expanding or retracting the clamping device.

[0085] In a fifth aspect there is provided for a vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising:

[0086] - a vibrator device mounted within a vibrator device housing;

[0087] - wherein the vibrator device comprises a driving system and a number of sets of eccentric masses;

[0088] - wherein each of the number of sets of eccentric masses is rotatably mounted on the vibrator device, and wherein the driving system is arranged to drive each set of eccentric masses of the number of sets of eccentric masses individually, such that an eccentric moment of each set of eccentric masses of the number of sets of eccentric masses is rotatably controllable by a driving force applied by the driving system.

[0089] Advantageously, by controlling a number of sets of eccentric masses in a vibrator device, the eccentric moment of a vibrator device may be controlled per set of eccentric masses. When a plurality of sets of eccentric masses is provided, i.e. by having a number larger than 2, each of the sets may be driven at the same frequency, by driving them at the same rotational speed by the driving system, or at a different frequencies by driving them at different speeds by the driving system. A larger driving force would correspond to a larger result in a higher frequency and vice versa. When the plurality of sets of eccentric masses are driven in phase with each other the total eccentric moment, which may be understood as the amplitude of the vibration caused by a corresponding vibratory device, is at a maximum. When a smaller eccentric moment is needed, e.g. in order to prevent damage to the pile, the sets can be driven out of phase, e.g. at an angle of 90 degreesrelative to each other. Furthermore, using multiple sets of eccentric masses that may each be driven individually may result a vibrator device comprising the multiple sets to produce high frequency vibrations without the need for mechanically connecting the multiple sets, significantly reducing the complexity of the system resulting in a more efficient assembly.

[0090] In a further advantage, having a number of sets of eccentric masses may allow for a compact design and may allow for the vibrator devices to start and stop without generating low frequency vibrations, which may cause damage to the surrounding of the vibrator device such as the crane and a supporting assembly such as a vessel or rig.

[0091] Furthermore, this may provide for control over the vibratory frequency of each of the vibrator devices, such that it is possible to fine-tune the force with which the pile is vibrated to the driving conditions, e.g. the soil conditions or characteristics of the pile.

[0092] A vibratory pile driving assembly having a number of sets of eccentric masses may be considered an improved alternative for vibrator devices with a variable eccentric moment, which have the number of sets of eccentric masses mechanical connected. The eccentric moment may be adjusted by changing the weights of the eccentric masses using a mechanical device inside the vibrator device. A disadvantage is that changing the weights of the eccentric masses causes extensive wear, that may require significant maintenance, compared to the vibrator device as described.

[0093] In an implementation of the vibratory pile driving assembly, the number of sets of eccentric masses of the vibrator device comprises an even number of sets of equally eccentric masses, and wherein the even number of sets of equally eccentric masses have a horizontal and / or vertical configuration. This may allow for a compact vibrator device, which may result in a more compact vibratory pile driving assembly.

[0094] In another implementation of the vibratory pile driving assembly, the assembly further comprises a control system arranged to control the driving force applied by the driving system, such that the rotational speed of each of the number of sets of eccentric masses is individually controlled. Advantageously, such a control system may be used to coordinate the rotational speed of each of the number of sets of eccentric masses, such that the combined resulting vibratory force such that the oscillation of the pile can be controlled using combined vibrational patterns due to the frequency and amplitude of the vibrations of individual sets of eccentric masses. Thus the control system may be used to simplify the input an operator of the vibratory pile driving assembly needs to provide to operate the assembly. Furthermore, if vibration measurement sensors are provided, e.g. on the pile or the assembly, a feedback loop may be provided such that the vibrations generated by the eccentric masses of the vibrator devices may be even further analysed and processed such that destructive resonance frequencies may be avoided and abnormal behaviour, e.g. due tofaulty equipment, may be quickly recognized by the control system and measures may be taken, e.g. by turning off the vibrator devices and / or adjusting the rotation speed accordingly.

[0095] In again another implementation of the vibratory pile driving assembly, the control system is arranged to control the rotational angle of each of the number of sets of eccentric masses relative to each other, such that each of the number of sets of eccentric masses rotates at substantially the same speed. This may prevent unwanted phase differences, or drifting out of phase of the sets of eccentric masses, by the control system. Unwanted phase differences between the eccentric masses, e.g. due to drifting or mechanical anomalies, may result in unplanned vibrations that may result in damaging or wear of the pile or the assembly. Rotating out of phase, e.g. unplanned or unknowingly due to a lack of control of the rotational angle, may also reduce the vibrational force provided by a vibrator device as the vibrations caused by the eccentric masses may interfere and cancel each other. Thus, by controlling the rotational angle between the number of sets of eccentric masses may ensure that no such interference occurs unplanned.

[0096] In yet another implementation of the vibratory pile driving assembly, each set of eccentric masses comprises an even number of eccentric masses, and wherein all eccentric masses of the set of eccentric masses rotate synchronously. Advantageously, this may result in a vibrator device providing a sufficiently strong vibratory force, resulting in oscillation of the pile, without the need of providing a single, larger, eccentric mass. As a result, the vibrator device experiences less wear and the design may be more compact.

[0097] In yet another implementation of the vibratory pile driving assembly, the angular sensor is provided for controlling the rotational movement of the eccentric masses of the vibrator device. Advantageously, an angular sensor may be used to measure the position of the eccentric mass, allowing for the control system to more accurately control the rotational movement of a corresponding eccentric mass. For example, the position of the eccentric mass along its circular trajectory may be determined, such that the sets of eccentric masses may be driven faster or slower to have a predetermined phase between sets. This may advantageously be used to control the eccentric moment, e.g. the amplitude of the vibration provided by the corresponding set..

[0098] In yet another implementation of the vibratory pile driving assembly, a speed sensor is provided to measure the speed of the eccentric masses. Advantageously, the speed sensor may be used to measure the rotational speed of the eccentric mass, allowing for the control system to more accurately control the rotational speed of a corresponding eccentric mass. This may advantageously be used to control the rotational speed of the correspondingset of eccentric masses, e.g. the frequency of the vibration provided by the corresponding set.

[0099] In a sixth aspect there is provided for a connector device for connecting and / or disconnecting hydraulic connections to a pile driving device, the connector device comprising:

[0100] - a body having a first end and a second end;

[0101] - a first coupling mechanism at the first end, configured to connect to a first hydraulic element;

[0102] - a second coupling mechanism at the second end, configured to connect to a pile driving device;

[0103] - an internal passage within the body, providing fluid communication between the first hydraulic element and the second hydraulic element;

[0104] - a locking mechanism to secure the hydraulic connection between the first end and the second end. The connector device may advantageously be used to provide a relatively quick and safe way of connecting hydraulic power packs, which may be used to drive various components of a pile driving assembly, between different types of pile driving assemblies. For example, in a vibratory pile driving assembly the connector may facilitate connecting the power packs to the vibrator devices, for driving said vibrator devices.

[0105] However in non-vibratory pile driving assemblies, where the vibrator device is absent, the power packs may be conveniently be connected to other components for powering them.

[0106] In an implementation of the connector device, the first coupling mechanism comprises a number of connection elements for allowing a number of hydraulic connections to be connected to each of the number of connection elements. Advantageously, this may be used in case multiple power packs, each having their own hose or piping, need to be connected, disconnected and / or reconnected. Using the connector device, all hoses and / or piping may be connected to the connector device, which may on its turn connect using a single connection to a pile driving device component, e.g. a vibrator device of a vibratory pile driving device.

[0107] In a further implementation of the connector device wherein a sealing mechanism within the internal passage is provided arranged to prevent fluid leakage. Leakage of fluid may result in a loss of power provided by a hydraulic power pack that is connected to the connector device. Thus preventing leakage of fluid may ensure stable operation without sudden power loss.

[0108] In an implementation, the dampening element comprises an oscillatory counterbalance unit. The oscillatory counterbalance unit comprises at least an elastic element connected to the lifting device arranged to control the dampening of the liftingdevice. The elastic elements may act absorb vibrations from the at least two vibrator devices, and may significantly reduce the kinetic energy, e.g. the vibrations, from the at least two vibrator devices transferring into the lifting means or crane lines, which can cause destabilization when the claimed assembly is used in an offshore installation project. Such an oscillatory counterbalance unit may be provided as the only dampening means or in combination with additional dampening means. An example of a oscillatory counterbalance unit is an active and / or a passive tunned mass damper assembly.

[0109] In an implementation, the oscillatory counterbalance unit comprises a number of elastic elements provided at a distance from each other such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed by each elastic element of the number of elastic elements. Advantageously, by providing a number of elastic elements at a distance from each other, e.g. parallel, in series or a combination thereof, more kinetic energy may be absorbed and the oscillatory counterbalance unit may more effectively dampen out vibrations from the at least to vibrator devices towards the lifting means.

[0110] In an implementation, at least one elastic element of the number of elastic elements each comprise a mass, such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed. In the context of the invention, a mass should be understood as a dedicated, relatively heavy component, for the purpose of absorbing the vibrations, and not as any component having a mass. Providing a mass to at least one elastic element of the number of elastic elements may further facilitate more effective damping of the vibrations caused by the vibrators to the lifting arm.

[0111] In an implementation, the oscillatory counterbalance unit is provided within the lifting device and / or connected to an external surface of the lifting device. This configuration provides a rather simple and durable assembly, that can withstand significant operational stresses and environmental impacts, ensuring reliable performance and extended service life even under demanding conditions.

[0112] In an implementation, the oscillatory counterbalance unit further comprises a damping mass device connected to the elastic element. The damping mass device comprises a load-bearing element configured to support a dampening load, a coupling member for connecting the load-bearing element to a lifting mechanism, and a safety link operatively provided at an opposite end of the coupling member. Moreover, the safety link comprises a slotted hole that is substantially elongated in the vertical direction such that vertical displacement of the damping mass device is permitted. This configuration, using a safety link, provides a controlled failure mechanism and additional operational safety in case of unexpected damage to the assembly, in particular the oscillatory counterbalance unit. In ascenario in which the load-bearing element is no longer capable of maintaining a connection with the lifting mechanism, e.g. due to damage to the load-bearing element, the safety link is arranged to maintain the connection such that the assembly may safely be brought to a location for repair.

[0113] In an implementation, the oscillatory counterbalance unit comprises an actuator, e.g. an suppressor actuator, connected to the lifting device to actively counteract at least a portion of the vibration energy of the assembly. Such an actuator may work similar to the suppressor actuator of the dampening element as previously disclosed, and may have similar advantages.

[0114] In an implementation, the actuator is actively controlled by means of a control system configured to generate control signal to actively adjust the motion of the actuator. This may advantageously allow the control of the actuator to be automated, which may reduce workload and may facilitate more accurate use of the actuator.

[0115] In an implementation, the oscillatory counterbalance unit comprises a sensor to detect at least one dynamic parameter of the assembly, the at least one dynamic parameter of the assembly being the acceleration, displacement, velocity, load or a combination thereof. Advantageously, by measuring a dynamic parameter of the assembly may allow for an accurate determination of the state of the assembly such that the actuator may be adjusted accordingly.

[0116] In an implementation, the lifting device comprises a connection tool to connect the assembly to a lifting arrangement, and wherein the oscillatory counterbalance unit is connected to the connection tool and / or the lifting arm. For the oscillatory counterbalance unit to work efficiently, it should be provided closely to the object that requires the reduced vibrations, e.g. the connection tool and / or the lifting arm. Thus, advantageously, the dampening effect of the oscillatory counter balance unit is further improved by forming in connection, preferably a direct connection, with the connection tool and / or lifting arm.

[0117] In an implementation, the oscillatory counterbalance unit is connected to lifting arrangement by means of the damping mass device and / or the connection tool. Connecting the oscillatory counterbalance unit to the lifting arrangement via the damping mass device and / or the connection tool enables highly effective reduction of vibrations transmitted toward the crane, improving operational safety and stability. This configuration provides a compact and structurally simple integration that reduces dynamic loads and fatigue on the lifting arrangement. Additionally, it may facilitate easy retrofit to existing lifting systems without requiring major structural modifications.

[0118] BRIEF DESCRIPTION OF THE DRAWINGSThe various aspects and examples thereof will now be discussed in conjunction with drawings. In the drawings:

[0119] Figure 1 shows an isometric view of an example of a vibratory pile driving assembly;

[0120] Figure 2 shows a first side view of the example of the vibratory pile driving assembly of Figure 1;

[0121] Figure 3 shows a second side view of the example of the vibratory pile driving assembly of Figure 1;

[0122] Figure 4 shows a close up of a cross sectional view of the example of the vibratory pile driving assembly of Figure 1;

[0123] Figures 5A-5C show a cross sectional view of at least two clamping devices of an example of a vibratory pile driving assembly, showing different stages of clamping a pile;

[0124] Figure 6 shows a schematic view of a connector device for a pile driving arrangement;

[0125] Figure 7 shows an isometric view of a further example of a vibratory pile driving assembly; and

[0126] Figure 8 shows a side view of the example of the vibratory pile driving assembly of Figure 7 in which some components are cut for illustrative purposes.

[0127] Figure 9 shows a front cut-away view of a part of a vibratory pile driving assembly;

[0128] Figure 10 shows a side cut-away view of a part of a vibratory pile driving assembly of Figure 9;

[0129] Figure 11 shows a perspective cut-away view of a part of a vibratory pile driving assembly of Figure 9

[0130] Figure 12 shows a front cut away view of a part of a vibratory pile driving assembly; and

[0131] Figure 13 shows a side cut-away view of a part of a vibratory pile driving assembly.

[0132] DETAILED DESCRIPTION

[0133] Figure 1, 2 and 3 show a vibratory pile driving assembly 100 for driving a pile (not depicted) into the ground and / or extracting a pile out of the ground. The assembly 100 comprises a second connection member 106 and a base element 102 having a first connection member 104. In the example, the base element 102 is depicted as a disc-shaped base element 102 in which the first connection member 104 is towards the bottom of thebase element 102 and the second connection member 106 is towards the top of the base element 102. The assembly 100 comprises at least two clamping devices 108 connected to the first connection member 104, e.g. the bottom of the base element 102. The clamping device 108 is arranged to clamp an end of a pile. In the shown example, the clamping device 108 is provided around the circumference of the base element 102. In such a configuration, it is advantageous that the circumference of the base element 102 has a comparable size relative to the circumference of a cross-section of a pile, e.g. a cross-section of the pile perpendicular to the longitudinal axis of the pile. This allows the clamping device 108 to clamp the end of a pile around the circumference of said pile, allowing for an even distribution of forces.

[0134] In order to position the clamping device 108 of the example relative to a pile, the clamping device 108 comprises a displacement mechanism 140 for moving the clamping device 108 in a linear direction. In the context of the invention, a linear direction should be understood as a direction along a straight line. In the shown example, the straight line is parallel to the first connection member 104 of the base element 102. It will however be clear that the linear direction may be orientated differently as well, depending on the shape of the base element 102 and its orientation relative to the pile. For example, if a base element 102 has been provided with a different shape than the disc-shaped base element 102 of Figs 1-3, the linear movement may be perpendicular to the first connection member 104 of the base element 102 or under and angle relative to the first connection member 104. The displacement mechanism 140 may be a hydraulically powered, mechanically powered or electrically powered, this may for example depend on the size and / or weight of the pile to be clamped. Positioning the clamping device 108 relative to a pile may be in particular useful when needing to subsequently needing to grab piles of different geometry. For example, after grabbing a pile having a first circumference, the clamping device 108 may be adjusted to grab a pile having a second circumference, being a smaller, larger or differently shaped circumference.

[0135] Referring to Figures 4, 5A-5C, an example of at least two clamping devices 108 has been depicted, in which the clamping device 108 comprises a first member 142, a second member 144 and an actuator 146. Both the first member 142 and second member 144 are made from a rigid and hard material, such that they do not significantly deform or wear during use, e.g. stainless steel. The first member 142 and second member 144 each comprise a mating surface 156. The mating surface 156 is provided such that, during use, the first member 142 and second member 144 can slide relative to each other such that the interfacing surfaces 156, in the shown example mating surfaces 156, of the corresponding members 142, 144 are in to contact with each other. Therefore, the mating surfaces 156 ofthe example are provided as relatively smooth mating surfaces 156 such that no unnecessary friction is present between the first member 142 and the second member 144 when said members slide relatively to each other over the mating surfaces 156.

[0136] The mating surface 156 of the first member 142 and the mating surface 156 of the second member 144 of the example are angled relative to a bottom surface 158 and top surface 160 of the corresponding first member 142 and second member 144 respectively. Specifically, the mating surfaces 156 in the example are angled equally relative to the horizon, i.e. the mating surfaces of the first member 142 both form a same angle relative to the horizon. It will be clear that the angles of the mating surfaces 156 relative to the bottom surface 158 and the top surface 160 of the corresponding first member 142 and second member 144 respectively. The first member 142 and second member 144 can be moved with respect to one another, such that the first member 142 and the second member 144 move from the first position to the second position, wherein the bottom surface 158 of the first member 142 is in contact with the pile and the top surface 160 of the second member 144 is in contact with the base element 102. In the example, the first member 142 and second member 144 maybe moved in the first direction DI and second direction D2, and vice versa, using actuator 146.

[0137] The actuator 146 is operably connected to the first member 142, such that when the actuator 146 drives the first member 142 in a first direction DI, the second member 144 moves in a second direction D2. The first direction DI and second direction D2 are perpendicular to each other. Due to the angled mating surfaces 156, it is possible to drive only one of the first member 142 and second member 144 using the actuator 146 in the first direction DI such that the other member of the first member 142 and second member 144 moves in the second, perpendicular, direction D2. It will be clear that, due to clamping device 108 being able to clamp and unclamp a pile, the actuator 146 can drive the first and second member 142, 144 both in forward as backward in the first direction DI and second direction D2.

[0138] Reference is made to Figs. 5A-5C, in operating of the clamping device 108 is depicted in various stages in a cross-sectional view. The clamping device 108 is arranged for clamping a pile 300 having a flange 302, but it will be clear that when the clamping device 108 is used for piles without a flange, the clamping device 108 may be arranged to clamp in a horizontal direction as opposed to the vertical direction as currently depicted.

[0139] In Figure 5A, the pile 300 is not yet clamped, but the clamping device 108 is aligned such that the pile may be clamped. The first member 142 and second member 144 are not yet in to contact with the flange 302 of the pile 300 and the first connection member 104 of the base element 102 and no force is exerted on the flange 302. In the example, theclamping device 108 further comprises a first clamp body 142, e.g. the first member 142, and a second clamp body 150 moveably connected to the first connection member 104 of the base element 102. The first clamp body 142 and the second clamp body 150 are arranged to assume a first position and a second position. In the first position, the first clamp body 142 and the second clamp body 150 are extended and the pile is not clamped. In the second position, the first clamp body 142 and the second clamp body 150 are retracted such that the first clamp body 142 and the second clamp body 150 clamp the end of a pile. In Figure 5 A, the first clamp body 142 and second clamp body 150 are still in the first position but both bodies 142 and 150 are prepositioned to clamp the pile 300 at the flange 302.

[0140] In Figure 5B, the actuator 146 has been partially retracted such that the bottom 158 of the first member 142 is in contact with the flange 302 of the pile 300 while the second member 144 is not yet in contact with the base element 102. Due to the angled mating surfaces 156, the first member 142 has been moved downward slightly, e.g. parallel to the second direction D2, such that it came in to contact with the flange 302. However, due to there still being space above the second member 144 and the base element 104, the flange is not yet clamped.

[0141] Turning to Figure 5C, the actuator 146 has been retracted even further, moving the first member 142 even further in the first direction DI. Due to the angled mating surfaces 156, and the presence of the flange 302 below the first member 142, the second member 144 is pressed upwards in the second direction D2. Once the second member 144 is no longer able to move further upward, due to it coming in to contact with the base element 102, further movement of the first member 142 in the first direction DI causes a downward force on the flange 302 of the pile 300 such that the flange 302 is clamped between the first clamp body 142, i.e. the first member 142, and second clamp body 150. This is the second position of the first clamp body 142 and the second clamp body 150 in which both are retracted and the pile 300 is clamped.

[0142] In order to move the second clamp body 150 from the extended position to the retracted position, an example of the clamping device 108 has been shown in Fig. 4, wherein the second clamp body 150 is in a extended position. The clamping device 108 comprises a lever system 162 having a rotational point 164 about which the lever system 162 rotates for operating the clamping device 108. Operating the clamping device 108 in the shown example means that the second clamp body 150 may be changed from an extended position to a retracted position by actuating the lever system 162 around its rotational point 164.

[0143] This is done in the example by providing the lever system 162 comprising out of a linking of lever elements. Specifically, the lever system 162 comprises a first leverelement 166 connected to the clamping device 108, a second lever element 168 connected to an actuator 170. The actuator 170 is configured to move the second lever element 168 such as to cause the first lever element 166 to retract the clamping device. In the depicted example, the clamping device 108 comprises multiple second clamp bodies 150 that may each be operated with a corresponding lever system 162. All lever systems 162 of the example are connected to a central actuator 170, said actuator 170 being a piston. By expanding or retracting the piston 170, all lever systems 162 expand or retract corresponding second clamp bodies 150. Since all second clamp bodies 150 are driving by the same device, and are mechanically coupled, it may be ensured that all second clamp bodies 150 of the clamping device 108 operate is substantially the same way, facilitating clamping a pile with an evenly spread force. It should be mentioned that the level system can be modified so that a single actuator (not depicted) operates each of the clamping devices 108 individually.

[0144] Referring to Figures 1, 2 and 3, the assembly 100 further comprises at least two vibrator devices 110, in the shown example four vibrator devices 110 are provided. Each vibrator device 110 is arranged to oscillate a pile clamped by the clamping device 108. Oscillation of the vibrator device may be provided by a set of eccentric masses being powered to rotate around an axis of rotation. The eccentric masses, i.e. masses having their centre of mass provided away from the axis of rotation, may be provided in different shapes and weights.

[0145] Increasing the mass of the eccentric masses and / or providing the centre of mass is further away from the axis of rotation, the larger force of oscillation will be. The larger to oscillation force, the more forceful the pile may be driven or removed from the soil. Since increasing the mass of the eccentric masses and providing the centre of mass further away from the axis of rotation commonly also results in larger vibration devices 110, it will be clear to the skilled person that a balance needs to be found between the size of the vibrator devices 110, and thus the pile driving assembly 100, and the oscillatory force. The frequency of oscillation depends on the speed of rotation of the eccentric masses, wherein a higher rotational speed around the axis of rotation results in a higher frequency of rotation. A higher frequency of oscillation may increase the speed at which a pile may be driven or extracted from the soil.

[0146] In the example, the number of sets of eccentric masses 154 of a vibrator device 110 of the at least two vibrator devices 110 comprises an even number of sets of equally eccentric masses 154. The even number of sets of equally eccentric masses 154 have a horizontal and vertical configuration, for example the sets of eccentric masses 154 may be positioned above each other, e.g. vertically, adjacent to each other, e.g. horizontal, or acombination of both. Positioning the sets of eccentric masses horizontally and / or vertically 154 within a vibrator device 110 allows for a more efficient transference of oscillatory forces to the pile, as the interference between the sets of eccentric masses 154 is minimized. Said inference may occur when the vibrations caused by the oscillation of an individually set of eccentric masses within a vibratory device is at least partially cancelled by the vibrations of another eccentric masses. This may for example occur when the sets of eccentric masses 154 rotate out of phase, or by the positioning of the sets of eccentric masses 154 relative to each other.

[0147] The assembly 100 of the example further comprises a control system arranged to control the driving force applied by the driving system, such that the rotational speed of each of the number of sets of eccentric masses 154 is individually controlled. This may be done by providing a driving member to each set of eccentric masses 154, wherein the driving member forms a mechanical connection between the driving system and the eccentric mass. By increasing / decreasing the speed of driving means, the phase between sets of eccentric members 154 and their corresponding frequency may be adjusted. The control system may be arranged to allow for manual control of the driving force by a user, e.g. using direct input such as a lever or using a graphical user interface, using a programmed feedback mechanism, or a combination of any of these elements. Adjusting the driving force may be advantageous to have greater control over the driving or the extracting of a pile. Too much driving force, may result an excessive wear of the assembly 100, damage to the pile, or excessive noise pollution to the surrounding of the pile and the pile driving assembly 100. Insufficient driving force may result in a low oscillatory frequency, which may result in an unnecessary lengthy process of driving or removing the pile. An efficient frequency may depend on the sediment being driven or extracted from, e.g. the hardness of the soil, the size of the pile and other parameters. In the example, the control system is arranged to control the rotational angle of each of the number of sets of eccentric masses 154 relative to each other, such that each of the number of sets of eccentric masses 154 rotates at substantially the same speed. The vibrator devices 110 may be driven by hydraulic power packs. Said hydraulic power packs provide an hydraulic fluid under pressure. The pressurized hydraulic fluid may be used to drive the eccentric masses 154 of the vibrator devices 110.

[0148] The rotational angle between each of the number of sets of eccentric masses 154 should be understood as the angle between a set and a second set over the full rotation. If the angle is 0 or 360 degrees, the sets of eccentric masses are in the same orientation around their corresponding axis of rotation. An angle of 180 degrees would correspond in leading or lagging half a rotation with a reference set of eccentric masses. By manipulatingthe rotational angle between eccentric masses, the amplitude of the vibrations caused by oscillation of the vibrator device 110 may be affected. When the eccentric masses 154 of a vibrator device 110 are rotation synchronously, e.g. having an angle of 0 or 360 degrees, the amplitude of the oscillation of the vibrator device 110 is at its maximum, resulting in strong vibrations. When the eccentric masses 154 of a vibrator device 110 are at an angle of rotation with respect to each other, the amplitude of the oscillation is less due to interference. In the example, each set of eccentric masses 154 comprises an even number of eccentric masses 154 rotating synchronously, resulting in a maximum vibratory force applied to the pile.

[0149] To provide further control over the vibrations provided to the pile by the vibrator device 110, a speed sensor is provided to measure the speed of the eccentric masses 154 as an example. This may allow the operator of the vibratory assembly device 100 to monitor behaviour to see if there are any anomalies that may indicate damage to the assembly 100 or pile. Furthermore, the sensor may be used as an input for the control system such that the driving system 152 can be controlled based on the rotational speed of the eccentric masses 154. The speed of the eccentric masses 154 may be measured, using the sensor, directly or indirectly. Directly meaning that the speed of the eccentric masses 154 themselves are measured, while indirectly may be done by measuring a driving member, acting as a device to transfer the rotational force from the driving system 152 to the eccentric masses 154, or measuring other secondary characteristics such as power provided to the driving system. A combination of direction measurements with any number of indirect measurements is also possible, resulting in a more accurate total result.

[0150] The four vibrator devices 110 are spaced apart from each other. In the example, the four vibrator devices 110 are provided parallel to each other. Each vibrator device 110 is arranged to oscillate a pile clamped by the clamping device 108. In the example, each of the four vibrator devices 110 comprises a driving system 152 and a number of sets of eccentric masses 154. Each of the number of the sets of eccentric masses 154 is rotatably mounted to a corresponding vibrator device 110. The driving system 152 of each vibrator device 110 of the four vibrator devices 110 is arranged to drive each set of eccentric masses of the number of sets of eccentric masses of the corresponding vibrator device 110 individually, such that an eccentric moment of each set of eccentric masses of the number of sets of eccentric masses of the corresponding vibrator device 110 is rotatably controllable by a driving force of the driving system 152.

[0151] In the example, the assembly 100 comprise an inclination sensor arranged to measure the assembly 100 and the pile inclination when the assembly 100 is in use. Data from the inclination sensor may be provided to an operator driving or extracting a pile, suchthat the operator may verify correct and safe operation. Alternatively, the data provided by the sensors may be used for controlling the operation itself, e.g. as input for the lifting arm driving device 132. In the example, the assembly 100 comprises a sensor arranged to measure the angular position of the base element 102 relative to the lifting arm 114. In the shown example, this sensor is an encoder provided on the driving device 132, however it may be clear that other sensors may be used as well.

[0152] The assembly 100 comprises a lifting device 112 rotatably connected to the four vibrator devices 110. The lifting device 112 comprises at least a lifting arm 114, in the shown example four lifting arms 114 have been provided. Providing a plurality of lifting arms 114 allows for an even distribution of forces during use, e.g. when a pile is suspended from the vibratory pile driving assembly 100. This may allow for smaller dimensioned arms 114, compared to less lifting arms 114 arranged to carry the same amount of weight during use. Each of the lifting arms 114 comprises a dampening element 116 arranged to at least partially reduce the transmission of vibrations caused by the four vibrator devices 110 to the lifting device 112. This is due to the dampening element 116 being provided in the lifting arm 114 between the vibrator device 110, to which the lifting arm 114 is attached, and the connection tool 136.

[0153] Each of the four vibrator devices 110 comprises a connection element 126. The lifting arms 114 are attached to the four vibrator devices 106 via the connection element 126. Each connection element 126 comprises an upstanding member 128 having a hinge point 130 arranged to rotatably connect the lifting arm 114 to each of the four vibrator devices 106. In the example, the vibrator device 110 of a lifting arm 114 is connected to the corresponding lifting arm 114 at a lower end thereof, while the connection tool 136 is provided at an upper end 138, opposite the lower end, of the lifting arm 114.

[0154] The lifting device 112 of the example comprises a connection tool 136 at an upper end 138 of the lifting device 112. Specifically, the connection tool 136 is provided at an upper end 138 of each of the four lifting arms 114 of the example. A hoisting element 172 is provided in connection tool 136, to connect the assembly 100 to a lifting arrangement (not depicted) such as a crane. The hoisting element 172 is provided above and in between the lifting arms 114, towards the middle of the base element 102 of the assembly 100 such that the when the assembly 100 is lifted in a vertical direction, i.e. upwards, without a pile and is suspended from the lifting arrangement the first connection member 104 of the base element 102 faces the earth and is substantially parallel to the horizon. In other words, by providing hoisting element 172 towards the top of the vibratory pile driving assembly, along its longitudinal axis, and towards the middle of the assembly, in a plane from whichthe longitudinal axis extends transversely, the forces are evenly distributed through the lifting arms 114, and thus the lifting device 112.

[0155] In the example, the lifting device 112 comprises a housing 118 having a wall element 120. Specifically, each lifting arm 114 of the four lifting arms 114 of the lifting device 112 comprises a plurality of dampening elements 116. Each of these dampening element 116 is securely connected to a wall element 120 provided in each lifting arm 114. To protect the dampening elements 116 from the environment, e.g. external impact from debris and / or the weather, the lifting arm 114 of the lifting device 112 comprises pairs of plates 122. Each plate of the pair of plates 122 arranged parallel to each other. The dampening elements 116 are provided between facing surfaces of the pairs of plates 122. In the shown example, each lifting arm 114 comprises two dampening elements 116, and both of these dampening elements 116 are provided between a pair of plates 122. Thus, a total of two pairs of plates 122 are provided per lifting arm 114 making a total of eight pairs of plates 122 for the lifting device 112. In the shown example, both of the plates 122 of each pair of plates 122 acts as a wall element 120 to which a corresponding dampening element 116 is attached. In the depicted example, the dampening element 116 is securely attached to the corresponding lifting arm 114, facilitating dampening of the vibrations caused by the vibrator devices 110 towards the hoisting element 172 and thereby the crane.

[0156] In the example, each dampening element 116 comprises a shock absorbing material that is arranged to deform during use. In the shown example, the shock absorbing material is an elastomeric material. The dampening element 116 comprises a suppressor actuator 174, that in the shown example also acts as an upending actuator, arranged to be controllably activated. The suppressor actuator 174, also known as upending cylinder, is arranged to enable rotation of the lifting device 112 relative to the base element and / or to the vibrator devices 110. Additionally, the suppressor actuator 174 can be arranged to expand and retract to dampen vibrations such as to at least partially reduce the transmission of vibrations caused by the four vibrator devices 106 to the lifting device 112. When dampening, the suppressor actuator 174 is arranged to automatically adjust the amount of dampening provided, based on vibration data fed to the suppressor actuator 174. In the example, this data is fed directly from the vibrator device 110. Additionally, the suppressor actuator 174 comprises a sensor such that a feedback loop may be used to control the amount of dampening provided. The vibration suppressor device 174 is arranged to selectively engage each of a plurality of vibration suppressing components, e.g. an elastomeric shock absorbing material. In an expanded state, a minimal amount of vibration suppression is provided. However, when the suppressor actuator 174 is adjusts to a retracted state, the shock absorbing capacity increases incrementally as more vibrationsuppressing components are used to dampen the vibration. In the retracted state, the maximum amount of vibration suppressing components are engaged which results in a maximum amount of vibration suppression provided by the suppressor actuator 174.

[0157] The lifting device 112 of the example is arranged to be rotated relative to the base element 102 such as to move the assembly 110 between a lifting position and a stabbing position, e.g. when upending a pile. In the lifting position, a vertical axis of the lifting device 112 is substantially parallel to a longitudinal axis of the pile. In the stabbing position, the vertical axis of the lifting device 112 is substantially perpendicular to the longitudinal axis of the pile. Specifically, in the example, the lifting arms 114 are rotatable lifting arms 114 configured to move the assembly 100 from the stabbing position, wherein a clamped pile is in a horizontal position, into a vertical lifting position, wherein the clamped pile is being upended by the assembly 100. The lifting device 112 comprises a lifting arm driving device 132 arranged to angularly displace the lifting arms 114 with respect to the base element 102 and the four vibrator devices 110. In the example, the lifting arm driving device 132 comprises an upending mechanism, e.g. hydraulic pistons, arranged to move the assembly 100 from the stabbing position to the horizontal position. In the example, the assembly 100 comprises a control system configured to operate the displacement mechanism 140 to retract the clamping device 108 such that a pile may be clamped.

[0158] Figures 7 and 8 illustrates an embodiment wherein the assembly 100 comprises most of the same structural elements as in the lifting device of Figures 1-3. It should be noted that the assembly 100 as shown in Figures 7 and 8 operates in the same way as the one described in relation to Figures 1-3. The assembly 100 of Figures 7 and 8 show a base element 102 having a central upstanding structure with a first connector element 104 having a upstanding element comprising a connection element 126. The lifting device 112 is connected to the first connector element 104 via the connection element 126. Each connection element 126 comprises an upstanding member 128 having a hinge point 130 arranged to rotatably connect the lifting arm 114 to each of the vibrator devices 110 via the first connector element 104. In this example there is an even number of twelve vibrator devices 110. The skilled person will appreciate that the number of vibrator devices is not limited to the total number of this example. The lifting device 112 of the example comprises a number of the second connection member 106 provided around the base element 102. The base element 102 of the example comprises a tubular body having a number of second connection members 102 provided about said tubular body, wherein each of the number of vibratory devices 110 are connected to each of the second connection members 106. The second connection members 106 of the example comprise a pair of sets of parallel plates wherein the vibratory device 110 will be mounted and locked by means of a securingmember 115. The skilled person will appreciate that the securing member 115 of the example can be a screw and a nut, a wedge assembly, a releasable pin or any other suitable securing device. The second connection members 106 of the example are comprise a pair of vertically spaced apart connection points.

[0159] The lifting device of this example further comprises an array of vibratory devices 110 provided in a circular configuration, around the base element 102, wherein each of the vibratory devices are provided at an angle from each other, and wherein a connecting element 121 is provided in-between each pair of vibratory devices 110. In the example the displacement mechanism 140 of the clamping device 108 is slidably connected to the lower end of the vibrator device 110. The clamping device 108 and the displacement mechanism are the same as shown and described in Fig. 4. Still, it should be noted that each of the clamping devices 108 might comprise an individual displacement mechanisms or actuator configured to move the second lever element 168 such as to cause the first lever element 166 to retract the clamping device 108.

[0160] Turning to Fig. 6, a connector device 200 for connecting and / or disconnecting hydraulic connections to a pile driving device 100, the connector device 200 comprising a body 202 having a first end 204 and a second end 206. The connector device 200 further comprises a first coupling mechanism 208 at the first end 204, configured to connect to a first hydraulic element such as a hydraulic power pack 216. Additionally, the connector device 200 comprises a second coupling mechanism 210 at the second end 206, configured to connect to a pile driving device such as a vibratory pile driving assembly 100. An internal passage 212 is provided within the body 202 of the connector device 200, providing fluid communication between the first hydraulic element and the second hydraulic element. This may allow forming a connection between an hydraulic power pack and the vibrator devices 110 for driving the vibrator devices 110 using the hydraulic power pack 216.

[0161] A locking mechanism 210 is provided to secure the hydraulic connection between the first end 204 and the second end 206, preventing accidentally disconnection of the hydraulic connection. Such a connect device 200 may be used to relatively quickly connect and disconnect an hydraulic power pack to different pile driving assemblies, e.g. a vibratory pile driving assembly wherein the power pack are used to drive the vibrator devices 110 or a non-vibratory pile driving assembly where the power packs may be used otherwise. The first coupling mechanism comprises a number of connection elements for allowing a number of hydraulic connections to be connected to each of the number of connection elements, such that multiple power packs may be connected to the pile driving assembly. In the example, a sealing mechanism 214 within the internal passage 212 is provided arranged to preventfluid leakage of the hydraulic liquid, such that loss of power may be at least partially mitigated.

[0162] Figures 9 to 13 all illustrate an example wherein the lifting device 112 of the vibratory pile driving assembly 100, is shown. The lifting device as shown in Figures 9 to 13 comprises the features of the lifting device 112 as per the rest of the Figures, especially the lifting device 112 of Figures 1-3, 7 and 8. The lifting device 112 further comprises an oscillatory counterbalance unit 400. The oscillatory counterbalance unit 400 as embodied is provided within the lifting device 112 and / or connected to an external surface of the lifting device 112.

[0163] The oscillatory counterbalance unit 400, as depicted, comprises a number of elastic elements 404 connected to the lifting device 112 at one end. At the other end, the elastic elements 404 are elastically connected to a damping mass device 402. The number of elastic elements 404 are provided at a distance from each other, in the shown example a vertical distance. The damping mass device 402 as embodied comprises a top and a bottom part connected by an intermediate part. The top part of the damping mass device 402 comprises a coupling member 403 for connecting the lifting device 112, and as a consequence the vibratory pile driving assembly 100, to a lifting mechanism 410. The bottom part of the damping mass device comprises a safety link 401 in a form of an elongated opening or slotted hole, in the vertical direction, which is connected to a hinge pin such that vertical displacement of the damping mass device 402 is permitted. This allows that in case of partial or full failure, a controlled response absorption of the kinetic force can be controlled, wherein the rest of the elements or parts of the vibratory pile driving assembly 100 and the associated lifting device will be protected.

[0164] As illustrated in Figure 9, the lifting arm 112 comprises the dampening elements 116 provided between facing surfaces of the pairs of plates 122. The oscillatory counterbalance unit 400 is provided in the space in-between the inner pairs of plates 122. The top part of the lifting arm 112 comprises the coupling member 403, which houses, at least partially, the oscillatory counterbalance unit 400. At each side of the coupling member 403 a number of connecting plates 406 are provided at a location near the upper end 138 of the lifting device 112, which coincides with the lower end of the coupling member 403. Each of the connecting plates 406 serves a secure and / or rigid connection for each of the elastic elements 404. The lifting mechanism 410 is herewith embodied as a shackle, which is releasably connected to the lifting device 112 via a locking pin 420. The damping mass device 402 is locked into position by means of a fitting element 412 which is provided with the in the space in-between the inner pairs of plates 122 to securely insert and connect the damping mass device 402 into the lifting arm 114. The fitting element 412 of the examplecomprises a number of internally protruding ring elements that are provided to restrict axial (vertical) movement of the damping mass device 402.

[0165] The damping mass device 402, as shown in figure 10, comprises a body element having a number of concentric elements 422. The concentric elements 422 as embodied comprise a through openings to accommodate the elongated bodies of each of the elastic elements 404. Moreover, the external surface of the body element of the damping mass device 402 comprises a number of locking elements 415, in the form of protruding latches. The locking elements 415 are spaced apart from each other in the vertical direction around the lower part of the damping mass device 402. The locking elements 415 cooperate with a pair of spaced apart engaging surfaces of the fitting element 412, said engaging surfaces are formed as a substantially ring-shaped edges.

[0166] The shown elastic elements 404 comprise an elongated body having a tapered or conical shape in the shown example. Each elastic elements 404 is at one end fixedly connected to the connecting plate 406, and at the opposite side to a provided a head member. The head member is of a slightly larger dimension than the adjacent narrower part of the tapered or conical shape of each of the elastic elements 404. The head member is releasably connected to the damping mass device 402, and more specially to one of the concentric elements 422 of the damping mass device 402.

[0167] Figures 12 and 13 additionally illustrate a number of hydraulic and / or supply cables 440, arranged to provide the necessary hydraulic fluid, electrical power, and / or control signals required for operating various components of the vibratory pile driving assembly 100. In the shown example, these cables ensure a continuous and reliable connection between the control system, the vibrator devices 110 and the displacement mechanisms 140, thereby enabling proper functioning of the clamping, vibration, lifting, and damping systems during both pile driving and extraction operations.

[0168] In summary, the various aspects and implementations thereof relate to the following examples:

[0169] Bl. A vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising:

[0170] - a vibrator device mounted within a vibrator device housing;

[0171] - a suppressor device;

[0172] - at least two clamping devices configured to engage with a pile;

[0173] - wherein the clamping device comprises a displacement mechanism for moving the clamping device in a linear direction; and

[0174] - wherein the clamping device further comprises a first member, a second member and an actuator, wherein the actuator is operably connected to the first member,such that when the actuator drives the first member in a first direction, the second member moves in a second direction, wherein the first direction and second direction are perpendicular to each other.

[0175] B2. The assembly of example Bl, wherein the clamping device further comprises a first clamp body and a second clamp body moveably connected to the first connection member of the base element, such that the first clamp body and the second clamp body are moveable between the first position wherein the first clamp body and the second clamp body are extended, and a second position wherein the first clamp body and the second clamp body are retracted such that the first clamp body and the second clamp body clamp the end of a pile.

[0176] B3. The assembly of example Bl or B2, wherein the first member and second member each comprise a mating surface, wherein the mating surface of the first member and the mating surface of the second member are angled relative to a bottom surface and top surface of the corresponding first member and second member respectively, and wherein the first member and second member can be moved with respect to one another, wherein the bottom surface and top surface of the first member and second member are in contact with the pile and / or the first connection member of the base element.

[0177] B4. The assembly according to any of the examples B1-B3, wherein the clamping device comprises a lever system having a rotational point about which the lever system rotates for operating the clamping device.

[0178] B5. The assembly according to example B4, wherein the lever system comprises a first lever element connected to the clamping device; a second lever element connected to an actuator; and wherein the actuator is configured to move the second lever element to cause the first lever element to retract the clamping device.

[0179] B6. The assembly according to any of the examples B1-B5, further comprising a control system configured to operate the displacement mechanism to retract the clamping device.

[0180] Cl. A vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising:

[0181] - a vibrator device mounted within a vibrator device housing;- wherein the vibrator device comprises a driving system and a number of sets of eccentric masses;

[0182] - wherein each of the number of sets of eccentric masses is rotatably mounted on the vibrator device, and wherein the driving system is arranged to drive each set of eccentric masses of the number of sets of eccentric masses individually, such that an eccentric moment of each set of eccentric masses of the number of sets of eccentric masses is rotatably controllable by a driving force applied by the driving system.

[0183] C2. The assembly of example Cl, wherein the number of sets of eccentric masses of the vibrator device comprises an even number of sets of equally eccentric masses, and wherein the even number of sets of equally eccentric masses have a horizontal and / or vertical configuration.

[0184] C3. The assembly of example Cl or C2, wherein the assembly further comprises a control system arranged to control the driving force applied by the driving system, such that the rotational speed of each of the number of sets of eccentric masses is individually controlled.

[0185] C4. The assembly of example C3, wherein the control system is arranged to control the rotational angle of each of the number of sets of eccentric masses relative to each other, such that each of the number of sets of eccentric masses rotates at substantially the same speed.

[0186] C5. The assembly according to any of the examples Cl -C4, wherein each set of eccentric masses comprises an even number of eccentric masses, and wherein all eccentric masses of the set of eccentric masses rotate synchronously.

[0187] C6. The assembly according to any of the examples Cl - C5, wherein an angular sensor is provided for controlling the rotational movement of the eccentric masses of the vibrator device.

[0188] C7. The assembly according to any of the examples Cl - C6, wherein a speed sensor is provided to measure the speed of the eccentric masses.

[0189] DI. A connector device for connecting and / or disconnecting hydraulic connections to a pile driving device, the connector device comprising:- a body having a first end and a second end;

[0190] - a first coupling mechanism at the first end, configured to connect to a first hydraulic element;

[0191] - a second coupling mechanism at the second end, configured to connect to a pile driving device;

[0192] - an internal passage within the body, providing fluid communication between the first hydraulic element and the second hydraulic element;

[0193] - a locking mechanism to secure the hydraulic connection between the first end and the second end.

[0194] D2. The connector device of example DI, wherein the first coupling mechanism comprises a number of connection elements for allowing a number of hydraulic connections to be connected to each of the number of connection elements.

[0195] D3. The connector device of example DI or D2, wherein a sealing mechanism within the internal passage is provided arranged to prevent fluid leakage.

[0196] El. The vibratory pile driving assembly according to any of the examples Bl - C7, wherein the assembly further comprises:

[0197] - a lifting device rotatably connected to the second connection member, and wherein the lifting device comprises at least a lifting arm comprises a dampening element arranged to at least partially reduce the transmission of vibrations to the lifting device, wherein the dampening element comprises an oscillatory counterbalance unit, said oscillatory counterbalance unit comprises at least an elastic element connected to the lifting device arranged to control the dampening of the lifting device.

[0198] E2. The assembly of example El, wherein the oscillatory counterbalance unit comprises a number of elastic elements provided at a distance from each other such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed by each elastic element of the number of elastic elements.

[0199] E3. The assembly of example E2, wherein at least one elastic element of the number of elastic elements comprise a mass, such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed.E4. The assembly according to any of the examples E2-E3, wherein the oscillatory counterbalance unit is provided within the lifting device and / or connected to an external surface of the lifting device.

[0200] E5. The assembly according to any of the examples E2-E4, wherein the lifting device is arranged to be rotated relative to the base element such as to move the vibratory pile driving assembly between a first position, wherein a vertical axis of the lifting device is substantially parallel to a longitudinal axis of the pile, and a second position wherein the vertical axis of the lifting device is substantially perpendicular to the longitudinal axis of the pile.

[0201] E6. The assembly according to any of the examples E2-E5, wherein the lifting device comprises a lifting arm having static part and a dynamic part, wherein the dampening element is provided in between the static part and the dynamic part.

[0202] E7. The assembly according to any of the examples E2-E6, wherein the oscillatory counterbalance unit further comprises a damping mass device connected to the elastic element, the damping mass device comprises a load-bearing element configured to support a dampening load, a coupling member for connecting the lifting device to a lifting mechanism, and a safety link operatively provided at a vertical distance of the coupling member.

[0203] E8. The assembly according to example E7, wherein the safety link comprises a slotted hole that is substantially elongated in the vertical direction such that vertical displacement of the damping mass device is permitted.

[0204] E9. The assembly according to any of the examples E2-E8, wherein the oscillatory counterbalance unit comprises an actuator connected to the lifting device to actively counteract at least partially the transmission of vibrations to the lifting device.

[0205] E10. The assembly according to example E9, wherein the actuator is actively controlled by means of a control system configured to generate a control signal to actively adjust the motion of the actuator.

[0206] Ell. The assembly according to example E9 or E10, wherein the oscillatory counterbalance unit comprises a sensor to detect at least one dynamic parameter of theassembly, the at least one dynamic parameter of the assembly being the acceleration, displacement, velocity, load or a combination thereof.

[0207] E12. The assembly according to any of the examples E2-E11, wherein the lifting device comprises a connection tool to connect the assembly to a lifting arrangement, and wherein the oscillatory counterbalance unit is connected to the connection tool and / or the lifting arm.

[0208] E13. The assembly according to example E12, wherein the oscillatory counterbalance unit is connected to lifting arrangement by means of the damping mass device and / or the connection tool.

Claims

Claims1. A vibratory pile driving assembly for driving a pile into the ground and / or extracting a pile out of the ground, the assembly comprising:- a base element having a first connection member;- a second connection member;- at least two clamping devices arranged to clamp an end of a pile;- at least two vibrator devices releasably connected to the first connection member of the base element and spaced apart from each other, each vibrator devices arranged to oscillate a pile clamped by the clamping device; and- a lifting device rotatably connected to the second connection member, and wherein the lifting device comprises at least a lifting arm comprises a dampening element arranged to at least partially reduce the transmission of vibrations caused by the at least two vibrator devices to the lifting device.

2. The assembly according to claim 1, wherein the dampening element comprises an oscillatory counterbalance unit, said oscillatory counterbalance unit comprises at least an elastic element connected to the lifting device arranged to control the dampening of the lifting device.

3. The assembly according to claim 2, wherein the oscillatory counterbalance unit comprises a number of elastic elements provided at a distance from each other such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed by each elastic element of the number of elastic elements.

4. The assembly of claim 3, wherein at least an elastic element of the number of elastic elements comprise a mass, such that at least part of the vibrations caused by the at least two vibrator devices to the lifting arm is absorbed.

5. The assembly according to any of the claims 3-4, wherein the oscillatory counterbalance unit is provided within the lifting device and / or connected to an external surface of the lifting device.

6. The assembly according to any of the claims 3-5, wherein the lifting device is arranged to be rotated relative to the base element such as to move the vibratory pile driving assembly between a first position, wherein a vertical axis of the lifting device is substantially parallel to a longitudinal axis of the pile, and a second position wherein thevertical axis of the lifting device is substantially perpendicular to the longitudinal axis of the pile.

7. The assembly according to any of the claims 3-6, wherein the lifting device comprises a lifting arm having static part and a dynamic part, wherein the dampening element is provided in between the static part and the dynamic part.

8. The assembly according to any of the claims 3-7, wherein the oscillatory counterbalance unit further comprises a damping mass device connected to the elastic element, the damping mass device comprises a load-bearing element configured to support a dampening load, a coupling member for connecting the lifting device to a lifting mechanism, and a safety link operatively provided at a vertical distance of the coupling member.

9. The assembly according to claim 8, wherein the safety link comprises a slotted hole that is substantially elongated in the vertical direction such that vertical displacement of the damping mass device is permitted.

10. The assembly according to any of the claims 3-9, wherein the oscillatory counterbalance unit comprises an actuator connected to the lifting device to actively counteract at least partially the transmission of vibrations to the lifting device.

11. The assembly according to claim 10, wherein the actuator is actively controlled by means of a control system configured to generate a control signal to actively adjust the motion of the actuator.

12. The assembly according to any of the claims 10-11, wherein the oscillatory counterbalance unit comprises a sensor to detect at least one dynamic parameter of the assembly, the at least one dynamic parameter of the assembly being the acceleration, displacement, velocity, load or a combination thereof.

13. The assembly according to any of the claims 3-12, wherein the lifting device comprises a connection tool to connect the assembly to a lifting arrangement, and wherein the oscillatory counterbalance unit is connected to the connection tool and / or the lifting arm.

14. The assembly according to claim 13, wherein the oscillatory counterbalance unit is connected to lifting arrangement by means of the damping mass device and / or the connection tool.

15. The assembly according to according to any of the preceding claims, wherein the second connection member is attached to the base element, and wherein the first connection member and second connection member are provided transverse relative to each other.

16. The assembly according to any of the preceding claims, wherein the second connection member is attached to the at least two vibrator devices.

17. The assembly according to claim 16, wherein each of the at least two vibrator devices comprise a connection element, and wherein the lifting arm is attached to the at least two vibrator devices via the connection element.

18. The assembly according to claim 17, wherein the connection element comprises an upstanding member having a hinge point arranged to rotatably connect the lifting arm to each of the at least two vibrator devices.

19. The assembly according to any of the preceding claims, wherein the at least two clamping devices are connected to each of the at least two vibrator devices.

20. The assembly according to claim 19, wherein the at least two clamping devices are connected to each of the at least two vibrator devices via the base element.

21. The assembly according to any of the preceding claims, wherein the lifting device is arranged to be rotated relative to the base element such as to move the vibratory pile driving assembly between a first position, wherein a vertical axis of the lifting device is substantially parallel to a longitudinal axis of the pile, and a second position wherein the vertical axis of the lifting device is substantially perpendicular to the longitudinal axis of the pile.

22. The assembly according to any of the preceding claims, wherein the lifting device comprises a lifting arm having a static part and a dynamic part, wherein the dampening element is provided in between the static part and the dynamic part.

23. The assembly according to any of the preceding claims, wherein the lifting device comprises a housing having a wall element, wherein the dampening element is securely connected to the wall element.

24. The assembly according to any of the preceding claims, wherein the lifting device comprises a pair of plates arranged parallel to each other, and wherein the dampening element is provided in between facing surfaces of the pair of plates.

25. The assembly according to any of the preceding claims, wherein the dampening element comprises a shock absorbing material arranged to deform during use, preferably an elastomeric material.

26. The assembly according to any of the preceding claims, wherein the dampening element comprises a suppressor actuator arranged to be controllably activated, and wherein the suppressor actuator is arranged to expand and retract to dampen vibrations such as to at least partially reduce the transmission of vibrations caused by the at least two vibrator devices to the lifting device.

27. The assembly according to any of the preceding claims, wherein the lifting device comprises a lifting arm driving device arranged to angularly displace the lifting arm with respect to the base element and / or the at least two vibrator devices.

28. The assembly according to claim 27, wherein the lifting arm driving device comprises an upending mechanism arranged to move the assembly from a stabbing position, wherein the pile is in a horizontal position, into a vertical lifting position, wherein the pile is being upended by the assembly.

29. The assembly according to any of the preceding claims, wherein the assembly further comprises an inclination sensor arranged to measure the assembly and / or the pile inclination when the assembly is in use.

30. The assembly according to any of the preceding claims, wherein the assembly comprises a sensor arranged to measure the angular position of the base element relative to the lifting arm.

31. The assembly according to any of the preceding claims, wherein the lifting device comprises a connection tool at an upper end of the lifting device.

32. The assembly according to claim 31, wherein the connection tool comprises a hoisting element to connect the assembly to a lifting arrangement.

33. The assembly according to any of the preceding claims, wherein the at least two clamping devices comprise a displacement mechanism for moving the clamping device in a linear direction.

34. The assembly according to claim 33 wherein each of the at least two clamping devices comprises a first member, a second member and an actuator, wherein the actuator is operably connected to the first member, such that when the actuator drives the first member in a first direction, the second member moves in a second direction, wherein the first direction and second direction are perpendicular to each other.

35. The assembly according to claim 34, wherein each of the at least two clamping devices further comprises a first clamp body and a second clamp body moveably connected to the base element or to each of the at least two vibrator devices, such that the first clamp body and the second clamp body are moveable between the first position wherein the first clamp body and the second clamp body are extended, and a second position wherein the first clamp body and the second clamp body are retracted such that the first clamp body and the second clamp body clamp the end of a pile.

36. The assembly according to any of the preceding claims, wherein each of the at least two vibrator devices comprises a driving system and a number of sets of eccentric masses, wherein each of the number of sets of eccentric masses is rotatably mounted on a corresponding vibrator device, and wherein the driving system is arranged to drive each set of eccentric masses of the number of sets of eccentric masses of the corresponding vibrator device individually, such that an eccentric moment of each set of eccentric masses of the number of sets of eccentric masses of the corresponding vibrator device is rotatably controllable by a driving force applied by the driving system.

37. The assembly according to claim 36, wherein the number of sets of eccentric masses of a vibrator device of the at least two vibrator devices comprises an even number of sets of equally eccentric masses, and wherein the even number of sets of equally eccentric masses have a horizontal and / or vertical configuration.

38. The assembly according to any of the preceding claims, wherein the at least two vibrator devices are provided parallel to each other.

39. The assembly according to any of the claims 1-37, wherein the at least two vibrator devices are provided at an angle relative to each other.

40. Method for driving a pile into the ground, comprising the steps;a) providing a vibratory pile driving assembly, preferably the pile driving assembly according to any of the preceding claims, comprising a lifting device connected to the at least two vibrator devices, wherein the at least two vibrator devices are spaced apart from each other, and wherein the lifting device comprises at least a lifting arm comprising a dampening element;b) centering the vibratory pile driving assembly with respect to the pile, c) connecting each of the at least two clamping devices to an open end of the pile, when the pile is in horizontal position, while controlling the angular position of the clamping device with respect to the lifting arm,d) upending the pile at a lift point on the lifting arm,e) lifting the pile, and1) vibratory driving the pile into the soil.

41. The method of claim 40, wherein between the step e) and 1) the method comprises positioning the pile at target location.

42. Method for extracting a pile out of the ground, comprising the steps;a) providing a vibratory pile driving assembly according to a preceding claim 1-39,b) centring the pile upending device with respect to the pile to be extracted out of the ground,c) connecting each of the at least two clamping devices to an open end of the pile, d) vibrating the pile, such that the pile becomes loose and can be extracted.

43. The method of claim 42, wherein the method further comprises the step:- down-ending the pile, such that the pile is changed from vertical orientation to horizontal orientation.

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