Abstract: A pile driver provided with a housing and at least one body connected with the housing so as to be moved back and forth over a predetermined path, the pile driver being further provided with a drive for moving the body back and forth over the path for the purpose of pile-driving, the pile driver comprising at least two parts movable relative to each other, respectively having at least a first type of sliding surface and at least a second type of sliding surface which during pile-driving slide along each other and between which there is a lubricant, wherein the first type of sliding surface is provided with polyether ether ketone.

Abstract: The invention relates to a coupling (8) for the releasable coupling of pipe parts, the coupling (8) comprising: a first pipe part (9), which on the inner circumference has two or more rows (18, 19) of lugs (13, 15); a second pipe part (10), which on the outer circumference has two or more rows (30, 31) of lugs (23, 24); wherein the lugs (13, 15, 23, 24) of each of the rows (18, 19, 30, 31) of the first pipe part (9) and of the second pipe part (10) have interspaces (12, 14, 25, 26) which are designed to allow lugs of one pipe part to pass the lugs of the other pipe part for sliding of the pipe parts (9, 10) into and out of one another in the axial direction, and wherein the pipe parts (9, 10), in the slid-together state, can be twisted in the tangential direction to make the lugs (13, 15) of the first pipe part (9) engage on the lugs (23, 24) of the second pipe part (10) for fixing of the pipe parts (9, 10) in the axial direction.

Abstract: The present invention relates to a device for passively reducing the noise vibrations in a liquid resulting from a sound source (62) which is arranged below the liquid level of a body of water (w), the device comprising a noise-insulating pipe (1) which is designed to be arranged around the sound source, wherein the pipe comprises a number of telescopically extendable and retractable pipe sections, (2,3,4) fastening means for attaching at least one first and one second pipe section to one another in extended and/or retracted position, wherein the fastening means are designed to allow the mutual displacement of the pipe sections in a starting position and to attach the pipe sections to one another in a fastening position, and wherein the fastening means are also designed to keep the first (2) and second pipe sections (3) substantially acoustically disconnected in the fastening position.

Abstract: The invention relates to a system for installing tubular foundation elements having open ends, in particular (mono)piles, in an underwater ground formation, comprising an hydraulic driver, an anvil, and an adaptor for transmitting energy from the anvil to the toe of the foundation element, which adaptor fits inside the tubular foundation element.

Abstract: The invention relates to a rudder for maneuvering a ship-like object, the rudder comprising a main rudder blade having an upstream end and a downstream end, the rudder being rotatably mountable to the ship-like object around a rotation axis that generally extends in a vertical plane. The main rudder blade extends generally upright. The rudder comprises two generally upright extending auxiliary rudder blades connected to the main rudder blade by transverse plates. At least one of the transverse plates is oriented generally obliquely upwards towards a downstream end. The transverse plates thereby follow the orientation of the flow of water below the upwards receding aft body of the ship.

Abstract: The present invention relates to a device for the passive reduction of the sound vibrations in a liquid resulting from a sound source arranged below the liquid level of a body of water, the device comprising an elongate tube which can be arranged over the sound source, the tube comprising an outer wall and inner wall, wherein the tube is designed to maintain a certain desired pressure in the intermediate space between the inner and outer wall. In this case, the pressure is reduced with respect to the ambient pressure. As a result of the reduced pressure, the sound vibrations will less readily travel to the outside and the noise level in the area around the tube is reduced.

Abstract: A suction tube device having a frame, a tube, a centrifugal pump which cooperates with the tube, and a cutter head at one end of the tube. The tube, centrifugal pump, and cutter head are supported by the frame. The centrifugal pump and the cutter head are each provided with a drive system, the drive systems of the centrifugal pump and of the cutter head each having at least one motor. A motor of the drive system of the cutter head and a motor of the drive system of the centrifugal pump are interchangeable with respect to each other.

Abstract: The invention relates to a template (10) for use in installing a plurality of foundation elements, in particular anchor piles (3), relative to one another in an underwater ground formation (2). The template (10) comprises a plurality of guides (11) for the foundation elements (3), which guides (11) are fixed relative to one another by means of a frame (12). At least one of the guides (11) comprises a sound-insulating sleeve (11A) for surrounding a foundation element (3) during driving.

Abstract: The invention relates to a method of installing foundation elements, in particular (mono)piles (2), in an underwater ground formation (3), by means of a driver (4), comprising the steps of placing a foundation element (2) on the underwater ground formation (3) and holding the foundation element (2) in place by means of a gripper (10) mounted on a surface vessel, placing a sleeve (6) for reducing noise input from the driver (4) about the foundation element (2), disengaging the gripper (10), lowering the sleeve (6) onto the ground formation (3), and placing the driver (4) on top of the foundation element (2). The sleeve (6) is held at least laterally with a guide (11) mounted on the surface vessel, at least when disengaging the gripper (10).

Abstract: An arrangement for installing building elements, such as piles and tunnel sections, into a ground formation, where a building element is provided. Two or more impact drivers for delivering blows to the element are mounted on or operatively connected to the element. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by utilizing a number of relatively small impact drivers.

Abstract: A tooth system for use in an earthmoving device, includes a tooth and an adapter onto which the tooth is mounted in a detachable fashion, the tooth including a longitudinally extending tooth web, a longitudinally extending tooth base and a longitudinally extending tooth head at a distance from the tooth base, the tooth base and tooth head also extending transversely with respect to the web. The adapter includes an adapter base intended to be fixed onto an earthmoving device, such as onto the teeth bars of a draghead, and an adapter head, a longitudinally extending undercut cavity being defined between the adapter base and the adapter head, wherein the tooth base is slidably fitted within the undercut cavity and wherein the adapter head is slidably fitted between the tooth base and the tooth head for mounting or dismounting the tooth with respect; to the front end of the adapter.

Abstract: A suction tube device having a frame, a tube, a centrifugal pump which cooperates with the tube, and a cutter head at one end of the tube. The tube, centrifugal pump, and cutter head are supported by the frame. The centrifugal pump and the cutter head are each provided with a drive system, the drive systems of the centrifugal pump and of the cutter head each having at least one motor. A motor of the drive system of the cutter head and a motor of the drive system of the centrifugal pump are interchangeable with respect to each other.

Abstract: A winch installation comprises a rotatably supported main winch device, such as a drum, for winding and unwinding an elongated flexible object such as a wire or cable. At least one auxiliary winch device is rotatably supported so as to be rotatable around the main winch device, said at least one auxiliary winch device being provided with at least one aperture for allowing the flexible object to pass from the circumference of the main winch device and outwardly with respect to the circumference of the auxiliary winch device, and control means for controlling the rotations of said winch device.

Abstract: A tooth system for use in an earthmoving device, includes a tooth and an adapter onto which the tooth is mounted in a detachable fashion, the tooth including a longitudinally extending tooth web, a longitudinally extending tooth base and a longitudinally extending tooth head at a distance from the tooth base, the tooth base and tooth head also extending transversely with respect to the web. The adapter includes an adapter base intended to be fixed onto an earthmoving device, such as onto the teeth bars of a draghead, and an adapter head, a longitudinally extending undercut cavity being defined between the adapter base and the adapter head, wherein the tooth base is slidably fitted within the undercut cavity and wherein the adapter head is slidably fitted between the tooth base and the tooth head for mounting or dismounting the tooth with respect; to the front end of the adapter.

Abstract: An arrangement for installing building elements, such as piles and tunnel sections, into a ground formation, which arrangement comprises such a building element is provided. Two or more impact drivers for delivering blows to the element are mounted on or operatively connected to the element. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by means of a number of relatively small impact drivers.