Itrec

A pile driving method for driving a pile, e.g. a hollow and open ended pile, e.g. a large diameter pile having an outer diameter of at least 5 meters, e.g. a monopile of an offshore wind turbine, into the soil, e.g. into the seabed. Use is made of a pile driving system which comprises a drive head member and a liquid fillable drop tank with a capacity to hold at least 50m3 of a liquid therein. A lift system brings the drop tank into an initial height position and a quick release of the lift system causes the drop tank to falls down onto an energy transfer assembly for transfer of energy from the falling drop tank to the drive head member.

A crane has a crane boom which is provided with a tagline system for controlling a load lifted by the crane, e.g. a wind turbine rotor blade in horizontal orientation. The tagline system comprises four laterally spaced elongated guide members extending along the crane boom and four tagline assemblies which each comprise a tagline, a tagline winch therefor, and a respective travelling block mounted on a respective guide member for travel along the guide member.

Installing a blade on a horizontal axis rotational hub of an offshore wind turbine. Use is made of a blade installation device that is temporarily installed on the offshore wind turbine. A mounting part is mounted on the foundation of the offshore wind turbine and/or on a lower portion of the wind turbine mast. A crane mast is erected vertically and is supported by the mounting part. The crane mast is configured to be composed of crane mast segments that are stackable one-by-one onto one another. A crane mast lifting unit is operated to repeatedly perform lifting actions in the process of erecting the crane mast. The blade installation device further comprises a hoist system with a crane boom that is mounted to a top end of the crane mast, a winch, and a winch driven cable.

A gripper supported by or configured to be supported by the loader boom of a loader of a mobile land rig for wellbore drilling and/or other wellbore related activities, comprising a main shaft provided with at least one jaw set comprising two adjacent jaws each pivotally mounted via a respective jaw base thereof on the main shaft and an actuator mechanism causing synchronized pivotal motion in opposed pivotal directions of the first and second jaws about the main shaft. The jaw set actuator mechanism comprises a gear wheel rotating around an axle radially to the main shaft and meshing with toothings on the jaw bases, and a jaws actuator exerting a relative pulling or pushing force between the first jaw and the second jaw.

A slew bearing for rotatably supporting an object on a base about a slew axis. The slew bearing comprises a stationary ring and a rotary ring part. The stationary ring part is provided with a stationary raceway member forming a stationary raceway surface oriented substantially perpendicular to the slew axis. The rotary ring part is provided with a rotary raceway member forming a rotary raceway surface. Rolling elements are provided between the stationary raceway surface and the rotary raceway surface. The slew bearing further comprises an elastically compressible resilient insert sandwiched either between the rotary raceway member and the rotary ring part or between the stationary ring part and the stationary raceway member. The slew bearing further comprises an axial load sensor for monitoring an axial load on the slew bearing by measuring a distance over the resilient insert.

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Zusammenfassung wird geladen …

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