Patent Application
20230046295
The present disclosure relates to pile driver modules, and an adaptive pile driver system for driving a pile at a worksite, wherein the pile driver system can be adapted to different situations by the piledriver modules.
Pile driving is used for a variety of applications, such as driving piles for foundations of buildings of varying sizes or smaller projects such as driving fence posts into the ground. These different applications impose different requirements on the pile driver used. Furthermore, the soil in which the pile is to be driven also gives rise to different requirements, e.g. if the pile is to be driven into sand it may be preferable to drive the pile by vibration, or if the pile is to be driven into clay it may be preferable to hammer or drill the pile.
Current pile drivers are normally configured to either drive a pile by vibration, hammering or drilling. The pile drivers are connected to a hydraulic system, which delivers the force needed for driving the pile. A draw back with current pile drivers is that they may be quite bulky, making it hard to gain access to some work sites. Furthermore, the terrain at some worksite does not allow the use of larger machinery as they risk tipping over or getting stuck. Even if it is possible to gain access with the pile driver, there is a risk that the pile driver is not suitable for the soil at the work site, as the pile driver may for example only be able to drill, where it would be more suitable to hammer or vibrate.
DE202015006358 U1 discloses a hand-held pneumatic pile driver with an exchangeable tool element. However, that disclosed hand-held pneumatic pile driver is reliant on an external source to deliver the air pressure. Furthermore, the hand-held pneumatic pile driver disclosed therein can only drive a pile by hammering.
Thus, it remains a problem to provide a simple, easy to handle, and easy to adapt pile driving system.
It is therefore the object of the invention to provide an improved pile driver system which is simple to use, easy to handle, and easy to adapt to a worksite.
In a first aspect of the invention the above and other objects are achieved by a drilling module for driving a pile along a first axis, wherein the drilling module is connectable to a drill rod and comprises:
a drill bit configured to drive the pile along the first axis, wherein the drill bit is configured to rotate with the drill rod when the drilling module is connected to the drill rod, wherein the drill bit comprises a first cutter configured for drilling along the first axis, wherein the first cutter is rotatable between a drilling position and a collapsed position, wherein in the drilling position a width of the drill bit in a plane perpendicular to the first axis corresponds to or exceeds a width of the pile in the plane perpendicular to the first axis, and wherein in the collapsed position the width of the drill bit in a plane perpendicular to the first axis is less than the width of the pile in a plane perpendicular to the first axis.
Consequently, by being able to reduce a width of the drill bit to less than the width of a pile allows for the drill module to be retracted through the pile when driving of the pile is done, thus the drill module may be reused for other piles.
The drilling module may be connectable to the drill rod via a threaded connection, a bayonet connections, a male-female connection, or a combination of these.
In the context of this invention a cutter is to be understood as any tool suitable for drilling through soil.
The first cutter may be connected to a base part of the drilling module via a pivot connection to allow for the first cutter to rotate. Preferably, the drilling module is provided with means for delimiting rotation of the first cutter to the collapsed position, the drilling position and positions there in-between, e.g. the drilling module may be provided with stop plates which the first cutter abuts at the collapsed position and the drilling position.
The drill bit may further comprise a second cutter, a third cutter, and/or a fourth cutter all movable between a drilling position and a collapsed position. Preferably, if the drill bit comprises more than one cutter the cutters may be central symmetric around the first axis.
The drill bit may comprise one or more stationary cutters, i.e. cutter which are fixed in position on the drill bit.
The drilling position being a position where in the first cutter is configured for drilling through soil. The collapsed position being a position allowing for the drill bit to be retracted/moved through a pile.
In an embodiment the first cutter is rotatable around an axis parallel to the first axis.
In an embodiment the first cutter is rotatable from the collapsed position to the drilling position by rotating the drill bit around the first axis in a first direction, and wherein the first cutter is rotatable from the drilling position to the collapsed position by counter-rotating the drill bit around the first axis in a second direction.
Consequently, a convenient and easy way of changing the position of the first cutter is achieved which may be carried out after a pile has been driven down by the drilling module.
In an embodiment the first cutter is rotatable around an axis perpendicular to the first axis.
In an embodiment the first cutter is rotatable from the drilling position to the collapsed position by moving the drill bit towards a pile being driven by the drill bit.
Consequently, a convenient and easy way of changing the position of the first cutter is achieved which may be carried out after a pile has been driven down by the drilling module.
The movement of the drill bit towards the pile may be achieved in a plethora of ways. In embodiments wherein smaller piles are driven by the drilling module, the drill bit rod may simply be pulled up together with the drill rod, this may be achieved via a user pulling up the drill rod, alternatively the drill rod may be pulled up by a jack, a crane or other external means. In some embodiments the drill bit may be pulled towards the pile by counter-rotating the drill bit, i.e. rotating the drill bit in an opposite direction relative to when a pile was being driven down.
In an embodiment the drilling module comprises a pilot drill configured to guide driving of the pile along the first axis, wherein the pilot drill extends longitudinally along the first axis.
Consequently, it is facilitated that the pile is driven in a straight direction, which may further increase structural capabilities of such a pile.
The pilot drill preferably extends beyond the first cutter to engage with the ground before the first cutter when driving down a pile. The pilot drill may be provided with a pilot cutter to enable the pilot drill to drill through the ground.
In an embodiment the drilling module comprises a centering device configured for being at least partly inserted into the pile being driven by the drilling module to center the drill bit relative to the pile.
Consequently, it may assure the pile is driven in a straight direction along the first axis. Furthermore, it may assure an even distribution of forces acting on the drill bit.
The centering device may have a similar cross-section to the pile being driven in a plane perpendicular to the first axis, preferably the similar cross-section of the centering device is uniformly scaled by reduction relative to the cross-section of the pile.
In an embodiment the drill bit is connectable to the drill rod in a releasable connection.
Having a releasable connection between the drill rod and the drill bit allows for easy exchange of the drill bit. Furthermore, the releasable connection may give the possibility of using the drill bit as a sacrificial drill bit.
In an embodiment the drill bit is formed with a track configured for facilitating movement of soil away from the bottom of the pile.
Having a track in the drill bit provides a path for soil to take away from the bottom of the pile. Furthermore, the track may help facilitating an upwards movement of soil moved away from the bottom of the pile. The upwards movement of soil is desirable as soil moved up may press down on the drill bit, the pile and/or the drill rod, thereby assisting in driving in the pile. The track provided may be a spiral path, thereby facilitating the movement of soil into the track while the drill bit rotates. In some embodiments the tracks may cooperate with a track in the drill rock, e.g. if the drill rod is an auger the track in the drill bit may lead soil to the helical screw blade of the auger.
In an embodiment the drill bit is formed with a protrusion configured for disturbing and loosening soil underneath the drill bit.
When drilling it may happen that the drill bit is not able to get a hold of soil to be moved, this may especially be prevalent in rocky soil, in such cases disturbing/loosening soil may help the drill bit in getting a hold on soil to be moved.
One or more protrusions may preferably be formed on the first cutter. In embodiments, wherein the drilling module comprises a pilot drill then one or more protrusions may be formed on the pilot drill.
In an embodiment of the pile driver module the drill bit comprises one or more wings, which is configured to extend beyond the pile, the one or more wing being configured for facilitating movement of soil away from the bottom of the pile.
Having wings may help facilitating an upwards movement of soil moved away from the bottom of the pile. The one or more wing may be formed as blades, configured for radiating away from the pile, that are set at a pitch to form at least part of a helical spiral. The drill bit may comprise one, two, three, four or more wings. In some embodiment the first cutter in the drilling position may acts as a wing facilitating movement of soil away from the bottom of the pile.
In a second aspect of the invention the above and other objects are achieved by a rock drilling module for driving a pile along a first axis, wherein the rock drilling module comprises:
an outer rock drill bit configured to drill an outer annular hole through rock with a diameter corresponding to or exceeding the pile in a plane perpendicular to the first axis, wherein the outer rock drill bit is connectable to a drill rod, wherein the outer rock drill bit is configured to rotate with the drill rod when connected to the drill rod,
an inner rock drill bit configured to drill an inner cylindrical hole through rock within the outer annular hole, wherein the inner rock drill bit is connectable to a drill rod, wherein the inner rock drill bit is configured to rotate with the drill rod when connected to the drill rod,
a rock cracking wedge configured to be inserted into the inner cylindrical hole to crack the rock in-between the inner cylindrical hole and the outer annular hole.
In a third aspect of the invention the above and other objects are achieved by an adaptive pile driver system for driving a pile at a worksite comprising:
a pile driver comprising:
a motor for providing a rotational force,
an electrical power unit that provides power to said motor,
a drill rod with a first end and a second end, the drill rod being adapted for extending within the pile in parallel with the pile, wherein the motor is configured to rotate the drill rod,
the system further comprising:
a vibrating module configured to drive the pile by vibrating the pile, said vibrating module is connectable to the drill rod, wherein said vibrating module is drivable by rotation of the drill rod when mounted,
a hammering module configured to drive the pile by hammering the pile, said hammering module is connectable to the drill rod, wherein said hammering module is drivable by rotation of the drill rod when mounted, and
a drilling module configured to drive the pile by drilling, said drilling module is connectable to the drill rod, wherein said drilling module is drivable by rotation of the drill rod when mounted,
wherein the pile driver is adaptable to the worksite where the pile is to be driven, by connecting one or more of pile driver modules to the drill rod.
Thereby, an improved pile driver system for drive a pile at a worksite is provided. The different modules allow for the pile driver to be adapted to the conditions at different work sites. Furthermore, since each module is connected to the drill rod and driven by the rotation of the drill rod, no additional hydraulics or wiring is needed to be added for the pile driver to drive a pile by drilling, hammering, or vibration. If prior to arriving at a work site soil tests have been performed, a user of the adaptive pile driver may also choose to only bring the relevant modules from the system to the work site, thereby alleviating transport of the pile driver.
The adaptive pile driver system may comprise any combination of the modules, i.e. the vibrating module, the hammering module, the drilling module, and the rock drilling module. The adaptive pile driver system may comprise three different modules, e.g. the hammering module, the drilling module, and the rock drilling module. In some embodiments the adaptive pile driver system comprises all four modules, i.e. the vibrating module, the hammering module, the drilling module, and the rock drilling module.
By a worksite is meant a place where work is to be performed by the pile driver, the worksite may be defined by the terrain and/or the soil types present at the work site.
Being able to use a drilling module for adapting the pile driver system gives large degree of flexibility to the pile driver system. Furthermore, since the drilling module is driven by rotation of the drill rod no external external/added power means are needed to be provided together with the drill bit. Furthermore, drilling is widely used in different soil types, giving a wide range of soil type the pile driver may work in.
Being able to use a rock drilling module for adapting the pile driver system allows for the pile driver to drive piles through rock, concrete, boulders and/or stones.
In an embodiment of the pile driver system, the pile driver comprises a footrest, allowing a user of the adaptive pile driver system to deliver a pressure for driving the pile.
Providing a footrest to the pile driver adds an extra way of driving the pile. Alternatively, or additionally, the pile driver may be provided with handles on which a user can press down.
In an embodiment of the pile driver system, the pile driver is a hand-held and/or hand actuated pile driver.
For smaller piles larger machinery is not needed as everything can be handled by a person. In such cases it is advantageous to have a hand-held pile driver to avoid bulky, cumbersome, and costly machinery. Such a hand-held driver may be provided with handles. The handles may further be provided with actuators for starting and turning off the electric motor.
In an embodiment of the pile driver system, the motor of the pile driver is configured to provide a vibrational and/or a hammering force for driving the pile.
By having the motor providing a vibrational and/or a hammering force, the motor may then assist or fully replace some of the pile driver modules in driving the pile, as sometimes adding a pile driver module to achieve a vibrational and/or hammering force may be excessive.
In an embodiment of the pile driver system the motor is an electric motor.
By having an electric motor an easy to handle pile driver is achieved. The electric motor assures that wiring or hoses for generators or hydraulics is obsolete or at least kept to a minimum. This removes the risk of failures in externally exposed wiring and hosing, which in some cases can pose a severe safety risk. Furthermore, the electric motor adds extra mobility and freedom to the pile driver, as the pile driver is not limited by hosing or wiring but can be moved freely around.
In a third aspect of the invention the above and other objects are achieved by a vibrating module for driving a pile along a first axis, where the vibrating module comprises:
a vibration device comprising:
a drill rod part being connectable to a drill rod, the drill rod part being configured to rotate with the drill rod when connected to the drill rod,
an eccentric mass connected to the drill rod part,
a transfer member connected to the drill rod part,
where the eccentric mass is in-between the drill rod and the pile when the drill rod part is connected to the drill rod, wherein the eccentric mass is configured to generate vibration when the drill rod rotates, wherein the transfer member is configured to transfer the generated vibrations to the pile.
Thereby, a simple pile driving module capable of driving a pile by vibration is provided. By having the pile driving module connectable to the drill rod allows for easy addition and removal of the pile driver module. Having the pile driver module easy to add and remove allows for a pile driver to be adapted on-site at a work site.
Furthermore, the pile driver module may be installed at a desired position on a drill rod, thus allowing for the vibration module to deliver down the hole vibration. Having the vibration generated as a result of rotation generated by the drill rod also removes the need for extra hydraulic or wiring,
In a fourth aspect of the invention the above and other objects are achieved by a hammering module for driving a pile along a first axis, wherein the hammering module comprises:
a drill rod part being connectable to a drill rod, the drill rod part being configured to rotate with the drill rod,
a hammer element comprising a top surface and a bottom surface, wherein the bottom surface forms one or more bottom ledges,
a force device connected to the top surface of the hammer element, said force device being configured to store and release mechanical energy,
a stationary element with a top surface comprising one or more top ledges complementary to the bottom ledges of the hammer element, and wherein the top surface of the stationary element is engaged with the bottom surface of the hammer element, and
wherein the hammer element is configured to rotate relative to the stationary, wherein rotation of the hammer element relative to the stationary element moves the hammer element along a bottom ledge, wherein the movement of the hammer element along the bottom ledge stores mechanical energy in the force device, wherein the stored mechanical energy is released when the hammer element rotates past the bottom ledge, wherein the released mechanical energy, wherein the released mechanical energy is configured for being delivered to drive the pile.
In a fifth aspect of the invention the above and other objects are achieved by a method for adapting a pile drive at a work site, the method comprising the steps of:
assessing the work site;
providing a pile driver system as described above;
dependent on the assessment of the work site, adapting the pile driver by connecting either a vibrating module, a hammering module, a drilling module, a rock drilling module, or a combination of these to the pile driver.
The assessment of the work site may be carried out by prior soil sampling of the work site. Alternatively, the assessment of the work site may be carried out using the knowledge of the user of the pile driver. The adaptation of the pile driver is carried out by connecting one or more pile driver modules to the drill rod dependent on the assessment of the work site.
The above and/or additional objects, features, and advantages of the present invention, will be further elucidated by the following illustrative and non-limiting detailed description of embodiments of the present invention, with reference to the appended drawings, wherein:
In the following description, reference is made to the accompanying figures, which show by way of illustration how the invention may be practiced.
Referring to
The electrical power unit may be a battery or any other unit capable of delivering energy to the motor. Preferably, the electrical power unit is a rechargeable battery.
The electric motor is configured for rotating a drill rod 2. The drill rod 2 may be any standard drill rod used for drilling in soil. The drill rod 2 may have a small diameter such as 2 cm or 3 cm, or a larger diameter such as 14 cm or 15 cm. The drill rod 2 extends longitudinally between a first end and a second end. The drill rod 2 is configured to rotate around a longitudinal rotation axis R1. The drill rod 2 may be rotated clockwise or counter-clockwise around the longitudinal rotation axis R1. The drill rod 2 may be modular and comprise a plurality of drill rod parts 21 connected together. In some cases, the length of one drill rod part 21 may be enough to form the full drill rod 2. The drill rod parts 21 may be inter-connected by threaded connections, bayonet connections, male and female connectors, or a combination of these. The drill rod parts 21 forming the drill rod 2 may also be of different lengths, allowing for a length of the drill rod 2 to be easily adaptable. The drill rod 2 may be a smooth drill rod 2, alternatively the drill rod 2 may be provided as an auger. The auger 2 may facilitate transport of soil through the pile 3.
The pile driver 1 is configured for driving the pile 3. The pile 3 in the shown embodiment is a pipe pile 3, though the invention is not limited to only pipe piles, but may be used for sheet piles, screw piles, secant piles, etc. The pile 3 chosen may depend on the needed function of the pile 3, conditions at the work site, and how it is to be driven into the soil, e.g. if the pile is to be driven by vibration, drilling, hammering or a combination of these.
The pile driver 1 further comprises a footrest 4. The footrest 4 allowing a user of the pile driver 1 to apply a pressure onto the pile 3. The footrest 4 in the shown embodiment is formed as a plate, which allows the user to step onto the plate to deliver a pressure to the pile 3. Alternatively, or additionally, pressure may be delivered to the pile 3 via hand-rests provided on the pile driver 1.
The pile driver 1 may be a hand-held pile driver and/or a hand actuated pile driver. To facilitate it being a hand-held pile driver, the pile driver 1 may be provided with handles for holding the pile driver 1 during operation of the pile driver 1. To facilitate it being a hand actuated pile driver the handles may be provided with an actuator for starting and stopping the electric motor of the pile driver 1, e.g. push buttons or levers. Alternatively, the pile driver 1 may be controllable by a remote control unit. Furthermore, the pile driver 1 may be configured to be mounted on larger machinery, e.g. an excavator or a drill rig.
The pile driver 1 can be adapted to different work site conditions, e.g. soil type. Adaptation of the pile driver 1 is achieved by connecting a combination of different pile driver modules to the drill rod 2 of the pile driver system 1. The pile driver modules may be connected to the pile driver 1 independently of each other, so the pile driver modules do not impose restrictions on each other. In the following text a more in-depth explanation of different modules for the pile driver system is given.
Drilling Module
In the embodiment shown
The drill bit 51 is connected to a drill rod part 21 of the drill rod 2. The connection between the drill bit 51 and the drill rod part 21 may be achieved by a threaded connection, bayonet connection, or male and female connectors or any other suitable connection. Alternatively, the drill bit 51 may be provided as an integral part of a drill rod part 21, wherein the drill rod part 21 may be connected to other drill rod part 21 of the drill rod 2 by a threaded connection, bayonet connection, or male and female connectors or any other suitable connection. When the drill bit 51 is connected to the drill rod part 21 it is able to rotate with the drill rod 2, thereby facilitating drilling with the drill bit 51. Furthermore, having a threaded connection or a male-female connection between the drill bit 51 and the drill rod part 21 allows for disconnecting the drill bit 51 from the drill rod part 21, without needing to have access to the drill bit 51. This is especially an advantage, if the drill bit 51 is a sacrificial drill bit 51, which is to be left in the soil together with the pile. The disconnection between the drill bit 51 and the drill rod 2 when there is a threaded connection may happen by rotating the drill rod 2 counter-clockwise, e.g. if the threaded connection between the drill bit 51 and the drill rod 2 is achieved with a right-handed thread, the drill rod 2 may be rotated counter-clockwise to disconnect the drill bit 51. In the case of a male-female connection between the drill bit 51 and the drill rod 2 the disconnection may happen by simply pulling up the drill rod 2, e.g. if the drill bit 51 is provided with a female connector and the drill rod is provided with a male connector or vice versa.
In the embodiment shown
If the pile driver 1 have not been provided with a drilling module 5, the pile 3 may be closed off at the bottom to assure soil does not enter the pile 3. The pile 3 may be closed off by a flat plate at the bottom of pile 3. Alternatively, the pile 3 may be closed with a conical shaped plate at the bottom, to facilitate the pile 3 being pressured, vibrated, or hammered into the soil.
Referring now to
The drilling module comprises a drill bit 51. The drill bit 51 is configured to rotate with the drill rod 2 when the drilling module 5 is connected to the drill rod 2. The drill bit 51 comprises a first cutter 511 configured for drilling along the longitudinal rotation axis R1. The drill bit 51 further comprises a second cutter 512 configured for drilling along the longitudinal rotation axis R1. The first cutter 511 and the second cutter 512 are rotatable between a drilling position and a collapsed position. When the first cutter 511 and the second cutter 512 are in the drilling position a width of the drill bit 51 in a plane perpendicular to the longitudinal rotation axis R1 corresponds to or exceeds a width of the pile 3 in the plane perpendicular to the longitudinal rotation axis R1. When the first cutter 511 and the second cutter 512 are in the collapsed position the width of the drill bit 51 in a plane perpendicular to the longitudinal rotation axis R1 is less than the width of the pile 3 in a plane perpendicular to the longitudinal rotation axis R1.
In the shown embodiment the drilling module 5 further comprises a pilot drill 52. The pilot drill 52 is configured to guide driving of the pile 3 along the longitudinal rotation axis R1. The pilot drill 52 extends longitudinally along the longitudinal rotation axis R1. The pilot drill 52 extends beyond the first cutter 511 and the second cutter 512. The pilot drill 52 is configured to rotate with the drill rod 2 when the drilling module 5 is connected to the drill rod. The pilot drill 52 comprises a pilot cutter 521 at a longitudinal end of the pilot drill 52. The pilot cutter 521 allows the pilot drill 52 to drill through soil.
In the shown embodiment the drilling module 5 comprises a centering device 53. The centering device 53 is inserted into the pile 3. The centering device centers the drilling module 5 relative to the pile 3. The centering device 53 is provided as a ring extending along an inner circumference of the pile 3. The centering device 53 restricts movement of the drilling module 5 in a plane perpendicular to the longitudinal rotation axis R1. The centering ring 53 also keeps the drill rod 2 centered relative to the pile 3.
In the shown embodiment the drill rod 2 is provided as an auger 2. The auger 2 comprises a helical screw blade 21 extending longitudinally along the longitudinal rotation axis R1. The auger 2 extends within the pile 3. In the shown embodiment the helical screw blade 21 extends towards the inner circumference of the pile. In the shown embodiment, the helical screw blade 21 stops a distance from the inner circumference of the pile 3. In other embodiments, the helical screw blade 21 extends so no to little distance separates the helical screw blade 21 and the inner circumference of the pile. Having no distance, or a small distance which does not allow soil to pass through in-between the inner circumference of the pile 3 and the helical screw blade 21, may be useful for lifting soil up through the auger 2.
Referring now to
The drilling module 5 comprises a first cutter 511 and a second cutter 512. The first cutter 511 and the second cutter 512 each comprises a plurality of protrusions 5111, 5121. The plurality of protrusions may facilitate drilling by the first cutter 511 and the second cutter 512 by disturbing and loosening soil underneath the first cutter 511 and the second cutter 512. The first cutter 511 and the second cutter 512 are pivotally connected to a base 58 of the drilling module 5. The pivotal connections 571, 572 between the base 58 and the first cutter 511 and the second cutter 512 allows the first cutter 511 and the second cutter 512 to rotate around an axis parallel to a first axis A1. Where the drilling module 5 is configured for driving a pile 3 along the first axis A1.
In the shown embodiment the first cutter 511 and the second cutter 512 are rotated to a drilling position. In the drilling position the first cutter and the second cutter abut a stop plate 56. Furthermore, the first cutter 511 and the second cutter 512 extend beyond an outer circumference of a centering device 53 in the drilling position. The stop plate 56 prevents further rotation of the first cutter 511 and the second cutter 512 in a first direction. By rotating the first cutter 511 and the second cutter 512 in a second direction, opposite the first direction, the first cutter 511 and the second cutter 512 moves from the drilling position to the collapsed position. In the collapsed position the first cutter 511 and the second cutter 512 does not extend beyond an outer circumference of the centering device 53.
The centering device 53 is provided as a ring. The centering device 53 being configured for being at least partly inserted into a pile 3. Extending from an inner circumference of the centering device 53 are two ridges 531. In some embodiments the centering device 53 comprise one ridge, three ridges, or four ridges. The ridges 531 are engaged with corresponding grooves 581 in the base 58 of the drilling module 5. The engagement between the grooves 581 and the ridges 531 prevents the centering device 53 from rotating relative to the base 58 of the drilling module 5. Furthermore, a bottom surface of the centering device 53 rests on a shelf 582 formed in the base 58. Preferably, the base 58 is formed with a plurality of shelfs 582 on which the bottom surface of the centering device 53 can rest. The shelf 582 prevents movement of centering device 53 relative to the base 58 in one direction along the first axis A1.
The base 58 of the drilling module 5 is provided with a center hole 55 for receiving a drill rod 2. When the drill rod 2 has been received in the center hole 55 it is rotatably locked relative to the drilling module by a suitable connection, e.g. by inserting a bolt or a clip through the base 58 and the drill rod 2.
The drilling module further comprises a pilot drill 52. The pilot drill 52 is configured to guide driving of a pile 3. The pilot drill 52 extends beyond the first cutter 511 and the second cutter 512. The pilot drill 52 is configured to rotate with the drill rod 2 when the drilling module 5 is connected to the drill rod. The pilot drill 52 comprises a pilot cutter 521 at a longitudinal end of the pilot drill 52. The pilot cutter 521 allows the pilot drill 52 to drill through soil.
Referring briefly
Rock Drilling Module
Referring now to
The rock drilling module 8 further comprises an inner rock drill bit 82 configured to drill an inner cylindrical hole 842 through rock 84 within the outer annular hole 841. The inner rock drill bit 82 is connectable to a drill rod 2, and the inner rock drill bit 82 is configured to rotate with the drill rod 2 when connected to the drill rod 2. In the shown embodiment the inner rock drill bit 82 comprises one inner rock cutter 821 configured to drill through rock 84, concrete, stone and/or boulders. The inner rock cutter 821 is configured to drill an inner cylindrical hole 842, where a center longitudinal axis of the inner cylindrical hole 842 coincides with the first axis A1. In other embodiments the inner rock drill bit 82 comprises two rock cutters, three rock cutters, four rock cutters, or more. Furthermore, in the shown embodiment the inner rock drill bit 82 extends beyond the outer rock drill bit 81 along the first axis A1, thus allowing the inner rock drill bit 82 to act as a pilot for the outer rock drill bit 81. In an embodiment the inner rock drill bit 82 is configured to guide driving of the pile 3 along the first axis A1.
The rock drilling module 8 further comprises a rock cracking wedge 83. The rock cracking wedge 83 is configured to be inserted into the inner cylindrical hole 842 to crack the rock 84 in-between the inner cylindrical hole 842 and the outer annular hole 841. In the shown embodiment, the rock cracking wedge 83 is connected to the inner rock drill bit 82 and configured to follow the movement axial movement along the first axis A1 of the inner rock drill bit 82. The rock cracking wedge 83 comprises an outer wedge 831. The outer wedge 831 is formed by two wedge parts 8311. In the shown embodiment the two wedge parts 8311 are opposed each other. The two opposing wedge parts 8311 are movable relative to each other in a plane 5 perpendicular to the first axis A1. The outer wedge 831 is movably connected to the inner rock drill bit 82 to allow axial along the first axis A1 relative to the inner rock drill bit 82. The outer wedge 831 being formed with a hollow conical structure with a circular top opening at the top of the conical structure and a circular bottom opening at the bottom of the conical structure. Preferably, the inner rock drill bit 821 is configured to drill the inner cylindrical hole 842 with a diameter exceeding a diameter of the circular top opening and less than a diameter of the circular bottom opening. Arranged at least partly within the outer wedge 831 is an inner wedge 832. The inner wedge 832 is fixedly connected to the inner rock drill bit 82, i.e. the inner wedge 832 is connected to prevent relative movement in-between the inner wedge 832 and the inner rock drill bit 82. The inner wedge 832 being formed as a conical structure, wherein a diameter of the base of the conical structure of the inner wedge 832 exceeds a diameter of the circular top opening of the outer wedge 831. Consequently, the outer wedge 831 is prevented from sliding past the inner wedge 832. In the shown embodiment, a conical shapes are used to achieve this effect, however the inner and outer wedges 831, 832 may assume any shapes which prevent the outer wedge 831 from sliding past the inner wedge 832.
During operation of the rock drilling module 8 the outer rock drill bit 81 forms the annular hole 841 in the rock 84 and the inner rock drill bit 82 forms the inner cylindrical hole 842. As the rock drilling module 8 is further drilled into the rock 84, the outer wedge 831 reaches and is partly inserted into the inner cylindrical hole 842. Further, drilling of the rock drilling module 8 results in the outer wedge 831 being axially moved relative to the inner rock drill bit 82 along the first axis A1 until it abuts the inner wedge 832. Further, drilling of the rock drilling module 8 results in the two wedge parts 8311 outer wedge 831 being moved away from each other by the inner wedge, resulting in a horizontal force being delivered to the rock 84, thus cracking the rock 84 in-between the inner cylindrical hole 842 and the outer annular hole 841.
In other embodiments, the outer wedge 831 may be formed in one part of resilient material allowing for the outer wedge 831 to be expanded by the inner wedge 832 in order to deliver a force to material in-between the inner cylindrical hole 842 and the outer annular hole 841. In yet other embodiments, the outer wedge 831 is formed with an outer protrusion on an interior side of the conical structure of the outer wedge 831. The inner wedge 832 may then be formed with an inner protrusion on an outer side of the conical structure of the inner wedge 832. During operation when the inner wedge 832 is rotating relative to the outer wedge 831, the inner protrusion is also rotating relative to the outer protrusion. As the outer wedge 831 is moved towards the inner wedge 832 so are the inner protrusion and the outer protrusion. At some point the outer protrusion and the inner protrusion will collide with each other. The collision between the inner protrusion and outer protrusion deforms the outer wedge 831 and results in a force being delivered to the material in-between the inner cylindrical hole 842 and the outer annular hole 841.
Vibrating Module
In the embodiment shown
In either direct or in-direct connection with the drill rod part 21 of the vibrating device is an eccentric mass 61. The eccentric mass 61 being eccentric relative to the drill rod part 21 on which it is connected. The eccentric mass 61 is connected so as to rotate with the drill rod part 21 of the vibrating device. The eccentric mass 61 is placed in-between the drill rod 2 and the pile 3. Rotation of the eccentric mass 61 around the drill rod 2 generates vibrations. The vibrations generated by the eccentric mass 61 are transferred to the pile 3 via a transfer member 62. The transfer member 62 is configured for contacting the pile 3 and transferring vibrations generated by the eccentric mass 61 to the pile 3. Alternatively, the eccentric mass 61 may contact the pile 3 directly, thereby also acting as the transfer member 62. The transfer member 62 may be formed with an arm 621 extending from the drill rod 2 to the pile 3. The transfer member 62 may also comprise a contacting element 622 for contacting the pile 3. The contacting element 622 may be formed as an annular element, where the annular element has an outer diameter equal to an inner diameter of the pile 3, thereby assuring a uniform contact to the pile 3. If the transfer member 62 is formed with an arm 621 extending from the drill rod 2 to the pile 3, the arm 621 may be bendable to allow the arm to deform in response to changes in the surface of the pile 3, e.g. if a thread, bent or bump is present on the pile 3. In the embodiment shown in
Referring
Arranged at a second longitudinal end of the vibrating module 6 is a further eccentric mass 63. The further eccentric mass 63 is arranged protruding form a further drill rod part 211. When the further drill rod part 211 starts to rotate the further eccentric mass 63 also rotates around the first axis A1, thus creating an eccentric force. The further eccentric mass 63 is configured to be in-between the drill rod 2 and the pile 3. In the shown embodiment, the further eccentric mass 63 directly contacts and transfers the eccentric force to the pile 3.
Hammering Module
In the embodiment shown
A more detailed view of an embodiment of the hammering module 7 is shown on
Referring to
The hammer element 71 comprises a top surface 711 connected to the spring 72. Furthermore, extending from the top surface 711 is a hammer protrusion 712. The hammer protrusion 712 extends from the surface 711 and into the spring 72, thus restricting movement of the spring 72 relative to the hammer element 71 in a plane perpendicular to the first axis A1. The hammer element 71 further comprises a bottom surface, not shown. The bottom surface forms one or more bottom ledges 713.
The hammering module 7 further comprises a stationary element 73 with a top surface, not shown, forming one or more top ledges 731 complementary to the bottom ledges 713 of the hammer element 71. The top surface of the stationary element 73 is engaged with the bottom surface of the hammer element 71. In some embodiments, the pile 3 is closed off at the bottom and the stationary element 73 is arranged resting on the bottom of the pile 3.
The hammer element 71 is configured to rotate relative to the stationary element 73. The rotation of the hammer element 71 relative to the stationary element 73 moves the hammer element 71 along the one or more top ledges 731. The movement of the hammer element 71 along the bottom ledge 731 stores mechanical energy in the force device 72. In the shown embodiment the hammer element 71 is moved towards the drill rod part 21, thus resulting in a compression of the spring 72. The stored mechanical energy is released when the hammer element 71 rotates past the one or more top ledges 731. The released mechanical energy is configured for being delivered to drive the pile 3.
Specific embodiments of the invention have now been described. However, several alternatives are possible, as would be apparent for someone skilled in the art. For example, the pile 3 do not need to be a pipe pile 3, e.g. if only the hammering module 7 is connected to the pile driver 1 the pile 3 does not need to be hollow.
Furthermore, though not shown on the drawings any combination of the modules described herein may be used for adapting a pile driver according to the invention.
Such and other obvious modifications must be considered to be within the scope of the present invention, as it is defined by the appended claims.
In particular, it is to be understood that other embodiments may be utilized, and structural and functional modifications may be made without departing from the scope of the present invention.
It should be emphasized that the term “comprises/comprising” when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2050113-6 | Feb 2020 | SE | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2021/052565 | 2/3/2021 | WO |
