Improved masts for solar pile driving machines are provided that incorporate inline drilling as well as alignment and assembly devices that enable greater positional accuracy than possible with conventional equipment. In some cases, a jig, holder, or other device on the mast of the machine can be used to place a bearing assembly for a single-axis tracker while the foundation is being installed. Also disclosed are various multi-piece foundation piles that enable positional adjustment between below and above-ground components to compensate for misalignment.

A percussion device that includes: an input side; an output side; at least one drive transmitter; a drive transmitter pathway; a percussion impactor; and a percussion anvil; where: the drive transmitter pathway is a circumferential pathway around a longitudinal axis of the percussion device; the drive transmitter pathway includes at least one tooth section including a lift section and a lead section; the at least one tooth section is essentially one wavelength of a sawtooth wave; the lift section is inclined away from a base of the drive transmitter pathway; the lead section is a section of the tooth section which abruptly returns to the base of the drive transmitter pathway; the input side is rotationally isolated from the percussion impactor; the percussion anvil is attached to, or forms part of, the output side; the percussion impactor includes an impact end and a force input end which are longitudinally opposite terminal ends of the percussion impactor; and the impact end faces the percussion anvil; such that: when in use, and the output section is free to rotate, the at least one drive transmitter and the drive transmitter pathway are configured to act co operatively to transfer the rotational motion of the input side to the output side; and when in use and limited or no rotation of the output side is possible, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to increase, maintain or decrease the distance between the percussion impactor and the percussion anvil; wherein the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to accept rotational motion from the input side and transmit a percussive and/or rotational motion to the output side.

A percussion device that includes: an input side; an output side; at least one drive transmitter; a drive transmitter pathway; a percussion impactor; and a percussion anvil; where: the drive transmitter pathway is a circumferential pathway around a longitudinal axis of the percussion device; the drive transmitter pathway includes at least one tooth section including a lift section and a lead section; the at least one tooth section is essentially one wavelength of a sawtooth wave; the lift section is inclined away from a base of the drive transmitter pathway; the lead section is a section of the tooth section which abruptly returns to the base of the drive transmitter pathway; the input side is rotationally isolated from the percussion impactor; the percussion anvil is attached to, or forms part of, the output side; the percussion impactor includes an impact end and a force input end which are longitudinally opposite terminal ends of the percussion impactor; and the impact end faces the percussion anvil; such that: when in use, and the output section is free to rotate, the at least one drive transmitter and the drive transmitter pathway are configured to act co operatively to transfer the rotational motion of the input side to the output side; and when in use and limited or no rotation of the output side is possible, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to increase, maintain or decrease the distance between the percussion impactor and the percussion anvil; wherein the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to accept rotational motion from the input side and transmit a percussive and/or rotational motion to the output side.

A method for installing a pile, in particular a monopile for a wind turbine, in a soil, comprising the method steps: driving the pile into the soil using a vibration device; andcompacting soil material surrounding a lateral surface of the pile.

A pile driving apparatus (1) for driving a pile (2) info ground comprises: a vertical guide mast (3); a support carriage (4) displaceable along the mast (3); a vibration hammer (10); a rotator coupling (20) and a tilt coupling (30) connected between the support carriage (4) and the vibration hammer (10). The vibration hammer (10) further comprises first clamping means (12) arranged at the side of a hammer main body (11), adapted for holding and clamping a pile at any position along the length of such pile; and the vibration hammer (10) further comprises second clamping means (13) arranged at the lower end of the hammer main body (11), adapted for holding and clamping a pile at a top end of the pile.

A pile driving apparatus (1) for driving a pile (2) info ground comprises: a vertical guide mast (3); a support carriage (4) displaceable along the mast (3); a vibration hammer (10); a rotator coupling (20) and a tilt coupling (30) connected between the support carriage (4) and the vibration hammer (10). The vibration hammer (10) further comprises first clamping means (12) arranged at the side of a hammer main body (11), adapted for holding and clamping a pile at any position along the length of such pile; and the vibration hammer (10) further comprises second clamping means (13) arranged at the lower end of the hammer main body (11), adapted for holding and clamping a pile at a top end of the pile.

Improved masts for solar pile driving machines are provided that incorporate inline drilling as well as alignment and assembly devices that enable greater positional accuracy than possible with conventional equipment. In some cases, a jig, holder, or other device on the mast of the machine can be used to place a bearing assembly for a single-axis tracker while the foundation is being installed. Also disclosed are various multi-piece foundation piles that enable positional adjustment between below and above-ground components to compensate for misalignment.

Improved masts for solar pile driving machines are provided that incorporate inline drilling as well as alignment and assembly devices that enable greater positional accuracy than possible with conventional equipment. In some cases, a jig, holder, or other device on the mast of the machine can be used to place a bearing assembly for a single-axis tracker while the foundation is being installed. Also disclosed are various multi-piece foundation piles that enable positional adjustment between below and above-ground components to compensate for misalignment.

A foundation treatment method for piling a foundation structure by penetrating a hardpan layer, i.e., a Deep Slurry Mixing method, comprising following steps: disturbing, by a mechanical device, a location where the foundation structure is to be piled, so that the mechanical device penetrates the hardpan layer of a natural foundation; then injecting clay slurry into the hardpan layer of the natural foundation by a pumping device, an improved foundation is formed after mixing; and piling the foundation structure. The method can change soil property of the original natural foundation, break the hardpan layer, reduce piling resistance of the steel plate cylinder or similar foundation structure, reduce uneven force during the piling process and improve driveability.

The present invention relates to an attachment for drilling and/or foundation work, in particular a casing oscillator or casing rotator, comprising a receiving apparatus for clamping at least one pipe and a drive for generating a rotational movement of the clamped pipe, wherein the attachment comprises at least one integral control unit for an independent carrying out of control functions of the attachment.