A transition piece for a wind turbine tower including a hollow frustoconical piece that is connected to an upper ring and a lower ring. The upper ring is connected to crossbars and the lower ring to radial columns. The transition piece also includes three connectors, each of them being connected to a crossbar, two radial columns and two connection profiles that keep the three connectors joined together, so that a pair of radial columns is arranged between a connector and the lower ring and the crossbars are arranged between the upper ring and a respective connector. The radial columns form an angle of between 65° and 75°, measured between the longitudinal axis of the corresponding radial column with the normal axis of the frustoconical piece.

Hoists, platforms and davits are described as well as methods of securing same to telecommunication and other towers. The hoists, platforms and davits may be secured to the towers on a temporary basis using clamps. The clamps may include brackets and cables. The cables may be attached to the brackets, may wrap around the outer surface/perimeter of the tower pole/leg and may use tension to keep the bracket in place.

Methods for onshore or offshore erecting an upstanding construction comprising longitudinal construction parts, comprising the steps of providing the longitudinal construction parts, transporting the longitudinal construction parts on a vehicle to an erection site, providing a crane for hoisting the longitudinal construction parts, using the crane for placing the respective longitudinal construction parts on top of each other on a construction base at the erection site, providing the construction base and/or the longitudinal construction parts with a support and guide facility for the crane, arranging that the crane is mountable on the support and guide facility, and mounting the crane on the support and guide facility of at least one of the construction base and the longitudinal construction parts that is placed on the construction base, so as to arrange that the crane is movable up and down along the support and guide facility of the construction.

A side saddle slingshot drilling rig includes a left and right substructure including a left and right lower box. The side saddle slingshot drilling rig includes a drill rig floor mechanically and pivotably coupled to the left and right lower boxes such that it is pivotably movable from a lowered position to a raised position. The drill rig floor includes a V-door. The V-door is positioned on the V-door side of the drill rig floor. The V-door side of the drill rig floor is oriented to face the right substructure. A mast coupled to the drill rig floor may include an open side, defining a mast V-door side. The mast V-door side may be oriented to face the right substructure. The mast may pivot into its raised position or may be a bootstrap mast.

An emergency restoration system is disclosed. The emergency restoration system including a base and a tower pivotally connected to the base. The tower including at least one tower section and at least one insulated tower section pivotally connected to the at least one tower section, the insulated tower section including at least one insulator pivotally connected thereto.

An emergency restoration system is disclosed. The emergency restoration system including a base and a tower pivotally connected to the base. The tower including at least one tower section and at least one insulated tower section pivotally connected to the at least one tower section, the insulated tower section including at least one insulator pivotally connected thereto.

A modular post for use in a barrier system comprises a post component and a base. The post component is configured to be attached or attachable on, to or in the base in a deployed configuration. The post component is configured to be housed within the base when the modular post is in a stored configuration. A method of using a modular post suitable for use in a barrier system is also provided. The method comprises providing a post component and a base. The post component is configured to be attached or attachable on, to or in the base in a deployed configuration. The post component is receivable or configured to be housed within the base when the modular post is in a stored configuration.

A method of assembling a structure, such as a wind turbine, is disclosed. The method comprises a step of providing a lifting arrangement comprising a gantry disposed over and/or directly above a rail, and lifting means coupled to the gantry. The method further comprises stacking portions of the structure by: conveyably disposing a first portion of the structure relative to the rail; lifting a second portion of the structure using the lifting means; disposing the first portion underneath the second portion by conveying the first portion along the rail; and lowering the second portion onto the first portion. Also disclosed is a corresponding system for assembling a structure, such as a wind turbine, and corresponding clamping and/or gripping system.

A flange element for a flange connection with a longitudinal centre axis A includes a flange part and an attachment part. The flange part has a front side with a front surface. The attachment part is adapted for secure attachment to a tubular element comprising a tower section of the tower structure for a wind turbine or a pipe element that is part of an offshare load bearing structure. The flange part is arranged radially on the inside of the flange element and is provided with a flange wedge. The flange wedge includes a flange wedge surface that is part of the front surface, and a flange heel including a flange heel surface that is part of the front surface. The flange wedge surface makes a wedge surface angle α1 and the flange heel surface makes a heel surface angle β with a plane P that is perpendicular to the longitudinal centre axis A of the flange element.

The present invention provides a reinforcing structure and method for reinforcing valve towers, mainly aiming at valve towers with three or more layers, wherein the four corners of the side face of each layer of a valve section of the valve tower are provided with connecting flanges, and connecting rods are used for connecting the corresponding connecting flanges of adjacent valve towers of the same bridge arm to realize lateral reinforcing. The connection modes of lateral reinforcing mainly include horizontal connection, interleaving connection and cross-layer connection. The invention provides various reinforcing solutions for flexible DC valve towers in the environment of long-term turbulence and strong vibrations, the reinforcing structure is simple and effective, high in reliability and operability, and easy to disassemble, and the stability and safety of the valve towers during transportation and operation are enhanced.