A system and method for installing a post-tensioning tendon (130) in an equipment tower (100). A sheave frame (196) attaches to anchor rods (140), and a pulley (198) is mounted to the sheave frame through which a hoisting cable (197) is passed for connection to an end (138) of the tendon to lift the tendon to the anchor rods. A carriage assembly (150) having a shank (152) and a bearing plate platform (154) extending transversely from the shank for receiving a bearing plate (170) is attached to the tendon. The carriage assembly includes a deflecting surface (158) to deflect the carriage assembly away from the installed bearing plate upon lowering after tendon attachment. A pair of hydraulic jacks (210) tension the tendon to a desired load.

A system and method for installing a post-tensioning tendon (130) in an equipment tower (100). A sheave frame (196) attaches to anchor rods (140), and a pulley (198) is mounted to the sheave frame through which a hoisting cable (197) is passed for connection to an end (138) of the tendon to lift the tendon to the anchor rods. A carriage assembly (150) having a shank (152) and a bearing plate platform (154) extending transversely from the shank for receiving a bearing plate (170) is attached to the tendon. The carriage assembly includes a deflecting surface (158) to deflect the carriage assembly away from the installed bearing plate upon lowering after tendon attachment. A pair of hydraulic jacks (210) tension the tendon to a desired load.

A modular drilling rig system includes multiple components. The system is transfigurable between a transport mode and an operational mode, and includes a drilling rig mast which is positionable in a vertical orientation; and a base structure adapted to be positioned on a surface near the well centre to support the drilling rig mast thereon. The base structure includes two elongated members that are connected to each other by a cross beam; and a displacement system to displace the drilling rig with respect to the surface in a horizontal direction. The displacement system is configured to displace the two elongated members of the base structure together in order to displace the drilling rig, and is configured such that the two elongated members can be displaced with respect to each other when the two elongated members are not connected to each other.

A mechanism for lowering a pole, such as a light pole, is disclosed. The mechanism includes a base arranged to rotate about a vertical axis of a pole portion, and an engaging portion arranged to rotate about an operating axis. The operating axis is in the order of 115 relative to the vertical axis. A pole member is fixed to an arm of the engaging portion.

A mechanism for lowering a pole, such as a light pole, is disclosed. The mechanism includes a base arranged to rotate about a vertical axis of a pole portion, and an engaging portion arranged to rotate about an operating axis. The operating axis is in the order of 115 relative to the vertical axis. A pole member is fixed to an arm of the engaging portion.

Methods and systems for assembling a modular ornamental pole. Pole sections can be joined without visible seams by inserting a pole splice fixedly connected to an interior of a first pole section into an interior of a second pole section and then fixedly connecting the second pole section to the pole splice. The pole splice is preferably a length of pole fixedly attached on its exterior to shims with dimensions closely matching the dimensions of pole section hollow interiors (transverse to a long axis of the pole sections), such that the pole splice contacts the interiors of first and second pole sections in multiple substantially separated locations to thereby prevent lateral movement of the pole sections with respect to each other.

A utility tower lifting apparatus and method for raising a lattice tower in addition to carried transmission cables without disturbing the tower foundation, disconnecting the cables, or requiring de-energization of the transmission lines.

This application relates to hinged tower segments and transport methods, and particularly to methods and apparatus for transporting and storing hinged segments of steel wind turbine towers. The wind turbine tower comprises a plurality of cylindrical vertical tower sections, which in the finished tower are mounted on top of one another. The vertical section of the tower has a longitudinal axis and comprises a plurality of wind turbine tower segments, the tower segments have vertical and horizontal edges and combine to form a complete vertical tower section by joining along their edges. Adjacent vertical tower sections are joined to each other along the horizontal edges of the wind turbine tower segments. Hinges are secured between tower segments and the tower segments rotated about the hinged axis to make them suitable for transport or storage. A method of assembling a tower section is discussed.

The present invention provides a tower section for a wind turbine which includes at least two tower elements stacked and arranged edge-to-edge at a joining plane, each tower element includes at least two wall segments, connected to one another by first connectors. The tower section further includes second connectors each extending astride the two adjacent tower elements along the longitudinal direction. Each second connector extends in the longitudinal extension of a first connector and has a width increasing, from the first connector, from a first width substantially equal to the width of the first connector to a second width strictly larger than the first width, the second width being reached before the joining plane starting from the first connector.

A method of modular pole construction an elongate modular pole structure is disclosed. A first step of the method involves providing hollow tapered pole section modules, each module having a first open end and an opposed second open end. A cross-section of the second end is less than a cross-section of the first end. The modules are stacked to form an elongated modular pole structure of a selected length by mating the second end of a first module with the first end of a second module. The first and second modules may have different structural properties, such that poles having desired structural properties can be constructed by selectively combining modules having differing structural properties.