In a method of installing a pile in the sea bottom by means of a pile guide which has a frame and at least an upper and a lower pair of cooperating guide members, wherein the upper pair and the lower pair are located at a distance from each other in vertical direction. Each pair of guide members comprises a passive guide member and an active guide member. The passive guide members are moved to respective fixed initial guiding positions with respect to the frame and the active guide members are moved to the pile until the passive and the active guide members engage the pile, after which the pile is hold between the upper pair of guide members and between the lower pair of guide members during driving the pile into the sea bottom, during which the actual forces between the pile and the respective guide members are determined.

A method for foundation of a transformer platform having at least four piles (12), in which precisely one pile driver (1) is brought to the location, the pile driver (1) is supported on the seabed (9) by means of extendable supporting legs (7), driving jigs (11) are attached to the pile driver (1), the piles (12) are inserted through the associated driving jigs (11), the piles (12) are successively driven into the seabed (9) whilst maintaining the position of the pile driver (1), upper ends of the piles (12) driven into the seabed (9) are arranged level with or above the associated driving jig (11), the supporting legs (7) of the pile driver (1) are retracted and the pile driver (1) is moved away from the location.

The invention relates to a method of building a foundation (1) comprising a steel monopile (2) and a precast concrete part (3) on top of the monopile (2), comprising:arranging a support structure (12) inside the monopile (2), the support structure (12) having a plurality of rods (16) extending radially with respect to a longitudinal axis of the monopile; bringing the concrete part (3) above the monopile (2), with supporting columns (13) interposed between the support structure (12) and the concrete part (3), wherein reinforcement bars (14) protruding from a bottom surface (9) of the precast concrete part (3) extend downwardly beyond the support structure (12) by passing between the rods (16) of the support structure (12); arranging tendons (15) between the support structure (12) and the concrete part (3) and tensioning the tendons (15); andpouring concrete into an upper part of the monopile (2).

The invention relates to a method of building a foundation (1) comprising a steel monopile (2) and a precast concrete part (3) on top of the monopile (2), comprising:arranging a support structure (12) inside the monopile (2), the support structure (12) having a plurality of rods (16) extending radially with respect to a longitudinal axis of the monopile; bringing the concrete part (3) above the monopile (2), with supporting columns (13) interposed between the support structure (12) and the concrete part (3), wherein reinforcement bars (14) protruding from a bottom surface (9) of the precast concrete part (3) extend downwardly beyond the support structure (12) by passing between the rods (16) of the support structure (12); arranging tendons (15) between the support structure (12) and the concrete part (3) and tensioning the tendons (15); andpouring concrete into an upper part of the monopile (2).

A double-acting hydraulic impact hammer includes a drop weight and an inner hydraulic piston. The drop weight is arranged to be driven in an upward and downward direction and the drop weight acts on a pile during its downward motion. The piston has a voided internal area defining a piston volume which is arranged to receive a piston rod and along which the piston extends and retracts axially. The piston volume is in sealed hydraulic communication with the hollow rod volume to form a first volume which changes size as the piston moves along the piston rod whereby the application of hydraulic pressure to the first volume biases the piston towards its extended position. The hammer includes a bore and a collar. The collar forms an outer piston having a working surface which when exposed to hydraulic fluid has sufficient surface area to lift the piston and the drop weight.

A sheet piling for mandrel-installed engagement with an identical adjacent sheet piling. The mandrel has a guide hook and a rotating toe protector. The sheet piling has a female interlocking feature with a pair of hooks and an engagement hook for releasably engaging the mandrel guide hook. The sheet piling also has a male interlocking feature with a pair of hooks configured to engage the pair of female hooks of an adjacent sheet piling in a multi-piling wall structure.

A sheet piling for mandrel-installed engagement with an identical adjacent sheet piling. The mandrel has a guide hook and a rotating toe protector. The sheet piling has a female interlocking feature with a pair of hooks and an engagement hook for releasably engaging the mandrel guide hook. The sheet piling also has a male interlocking feature with a pair of hooks configured to engage the pair of female hooks of an adjacent sheet piling in a multi-piling wall structure.

A ground mounting assembly includes one or a plurality of posts, each attached to at least one stabilizing plate or scoop pyramid. The post may be driven into the ground and then lifted to deploy plates into a locking mechanism, or driven into the ground by a pile driver with plate held in place, released, and driven further and deployed into a locking mechanism, or driven into the ground and double pounded inside the post to drive reinforcing plate into slotted winglets, or driven, double pounded and rotated to extend the reinforcing plates horizontally from the pole or pile. The post also can used as a mooring in harbors, lakes, or at sea. A system based on a double pounder pile driven mono pole, optionally extendable in length, is also described.

A ground mounting assembly includes one or a plurality of posts, each attached to at least one stabilizing plate or scoop pyramid. The post may be driven into the ground and then lifted to deploy plates into a locking mechanism, or driven into the ground by a pile driver with plate held in place, released, and driven further and deployed into a locking mechanism, or driven into the ground and double pounded inside the post to drive reinforcing plate into slotted winglets, or driven, double pounded and rotated to extend the reinforcing plates horizontally from the pole or pile. The post also can used as a mooring in harbors, lakes, or at sea. A system based on a double pounder pile driven mono pole, optionally extendable in length, is also described.

An apparatus and a method for attenuating water pressure pulses generated during sea piling when a percussion mechanism is used, including the stage of driving at least one pile into an earth by a percussion mechanism, while along at least a part of its axial extension, the pile is surrounded by water and at least partly by a tubular outer sleeve; and at least one gas-filled space is provided between the inner periphery of the outer sleeve and the outer periphery of the pile. The apparatus includes mechanisms for providing the gas-filled space.