The drilling rig includes a first substructure and a second substructure. The second substructure is positioned generally parallel to and spaced apart from the first substructure and generally the same height as the first substructure. The drilling rig further includes a drill floor coupled to the first and second substructures, where the drill floor positioned substantially at the top of the first and second substructures.

A hoisting system for the installation of a wind turbine wherein said hoisting system comprises measures to achieve a load bearing connection to the tower of the wind turbine and comprises measures to move the hoisting system up and down along the tower wherein the hoisting system, when it is fixed to an already installed part of the wind turbine tower with said load bearing connection, is arranged to install or remove any of a tower segment, a nacelle, a generator, a hub, and a blade in one or more combined hoists or in a single hoist.

A system for raising a mast includes a primary cylinder and an actuator. The primary cylinder has a first end coupled to the mast and a second end coupled to a lifting base. The primary cylinder actuates from a retracted position to an extended position to at least partially raise the mast. The actuator actuates from a retracted position to an extended position to at least partially raise the mast, thereby moving the first end of the primary cylinder or the second end of the primary cylinder toward a pivot point between the mast and the lifting base.

The present disclosure relates to systems and methods for providing self-standing, self-supporting, rapid-deployable (S4RD) towers for communications and similar applications, and in particular to ballast base systems that enable the self-standing, self-supporting, rapid-deployable features while eliminating the need for a permanent foundation for the tower. Novel and inventive tower designs, wherein a user may climb through an interior volume of the tower while using the tower structure as both ladder and man cage, are also disclosed.

A self-installing offshore column stabilized semi-submersible platform has at least one vertical buoyant ballastable column, a telescoping keel tank or stiffened damper plate movably connected with the vertical column that extends and retracts relative to a lower end thereof, and a non-collapsible turbine tower or a tilt and telescoping tower coupled to an upper end of the vertical column that telescopes and reciprocates relative thereto between a horizontal retracted position and an axially extended vertical position. A wind turbine with blades is coupled to a top portion of the tower assembly. The relative position and weight of the keel tank or damper plate is selectively adjustable to raise or lower the center of gravity of the entire mass of the semi-submersible platform including the wind turbine and tower assembly with respect to the center of buoyancy of the platform.

A mobile tower for transportation to and rapid deployment at remote sites where the mobile tower can be engaged with the ground, the mobile tower including an extendable and retractable tower secured to a mobile support structure including a frame having a plurality of rapidly deployable outriggers, wherein the tower includes three series of pivotally interconnected tower sections or segments, sections or segments of which engage with segments of each of the other series when the tower is assembled; the mobile tower including a plurality of guy wires secured between the extendable and retractable tower and the respective outriggers to stabilize the tower after the tower is assembled. The guy wires are preferably secured to the extendable and retractable tower at first and second connecting positions that are displaced from one another about an outer perimeter. Methods of deploying the mobile tower are also disclosed.

A mobile tower for transportation to and rapid deployment at remote sites where the mobile tower can be engaged with the ground, the mobile tower including an extendable and retractable tower secured to a mobile support structure including a frame having a plurality of rapidly deployable outriggers, wherein the tower includes three series of pivotally interconnected tower sections or segments, sections or segments of which engage with segments of each of the other series when the tower is assembled; the mobile tower including a plurality of guy wires secured between the extendable and retractable tower and the respective outriggers to stabilize the tower after the tower is assembled. The guy wires are preferably secured to the extendable and retractable tower at first and second connecting positions that are displaced from one another about an outer perimeter. Methods of deploying the mobile tower are also disclosed.

A section of concrete intended to form a mast for a windmill, the section extending along a longitudinal direction and including a first flange and a second flange, wherein the section is composed of several portions distributed along the longitudinal direction, the portions including a first portion with a first extremity and a second extremity opposed to each other in the longitudinal direction, the first portion including the first flange at its first extremity, the second extremity of the first portion is connected by a connecting interface to another portion continuing the first portion, and a second portion with a first extremity and a second extremity opposed to each other in the longitudinal direction, the second portion including the second flange at its second extremity.

A wind turbine tower, wind turbine tower installation apparatus and methods of erecting a wind turbine tower. The wind turbine tower installation apparatus has a frame having a guide for positioning the apparatus on an installed portion of a tower, a platform for supporting wind turbine components on the frame, and a mechanism for transversely positioning the supported wind turbine component in alignment with the tower. A lifting mechanism is provided for moving the apparatus longitudinally up and down the tower. The apparatus further has an adaptor frame defining a collar for receiving and aligning the free end of the installed portion of the tower and the adjacent end of the subsequent tower section. The wind turbine support tower has a mating interface having complimentary sleeve portions one of which has a radially displaceable locking ring for engaging a radially extending feature of the other sleeve portion.

A pole gin including a first portion having a first strap attachment configured to secure the pole gin to a utility pole at a first location and a second portion having a second strap attachment configured to secure the pole gin to the utility pole at a second location spaced from the first location. The first portion and the second portion can be adjustable relative to one another to vary a distance between the first location and the second location.