A pole assembly which includes a pole, a hub being placed on the pole, the hub having a plurality of enclosed channels formed therein, a plurality of arm assemblies with each arm assembly having a vertical segment designed to fit within a respective channel and an arm extending outwardly from the vertical segment, and a finial designed to sit on top of an upper end of the pole, the finial having a spirit level incorporated therein.

A cell tower is manufactured from a steel plate that is pressed into a polygon form, such as a 12-sided polygon or a 16-sided polygon. The tower is designed for direct embedding into the ground or attachment to a buried portion. The base portion contains apertures sized to permit the installation of an equipment rack directly into the interior of the tower. Other apertures in the tower provide handholes for installation of the equipment, backup batteries, and cabling. The top section of the cell tower includes mounting members for one or more sets of cellular radio antennas and/or microwave antennas. The antennas, and associated remote radio units, are mounted to the top of the cell tower and are hidden from view by one or more shrouds. The shrouds provide a visible barrier, but have minimal impact on the radio frequency characteristics.

A wind turbine tower is provided with a plurality of tower segment which are placed one on top of the other in order to form the tower. A lower tower segment has a lower end face, and in the lower region of the lower tower segment, the lower tower segment has a plurality of recesses and through-bores between the lower end face of the lower tower segment and a base of the recesses. The recesses are designed to receive a leveling unit for leveling the lower tower segment. The recesses are preferably provided on the inner face of the lower tower segment and provide an effective possibility for receiving leveling units.

A pushing-out apparatus for an extendible mast includes a mast storing unit, a mast pushing-out unit and a mast pushing-out driving unit. The storing unit stores an extendible mast including stages of foldable trusses in a state that the stages are folded. The pushing-out unit is stored in the storing unit around the stage-folded mast stored in the storing unit. The driving unit moves the pushing-out unit to a projecting position in an outside of the storing unit while the stages of the mast are folded, sequentially extend out the folded stages of the mast stored in the storing unit by the pushing-out unit from the storing unit and push out the extended stages from the pushing-out unit of the projecting position in a side of the pushing-out unit opposing to the storing unit.

A pushing-out apparatus for an extendible mast includes a mast storing unit, a mast pushing-out unit and a mast pushing-out driving unit. The storing unit stores an extendible mast including stages of foldable trusses in a state that the stages are folded. The pushing-out unit is stored in the storing unit around the stage-folded mast stored in the storing unit. The driving unit moves the pushing-out unit to a projecting position in an outside of the storing unit while the stages of the mast are folded, sequentially extend out the folded stages of the mast stored in the storing unit by the pushing-out unit from the storing unit and push out the extended stages from the pushing-out unit of the projecting position in a side of the pushing-out unit opposing to the storing unit.

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.

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.

A wind turbine with a tower, a nacelle and a yaw bearing, wherein the yaw bearing is arranged and prepared for rotating the nacelle relative to the tower around a yaw axis is provided. The yaw bearing has a first yaw bearing component which is fixed to the tower, a second yaw bearing component which is fixed to the nacelle, and at least one sliding component which is located between the first yaw bearing component and the second yaw bearing component. The wind turbine is prepared and arranged for housing at least one lifting device for lifting the nacelle relative to the tower such that the sliding component can be removed. Furthermore, a method of lifting the nacelle relative to the tower is provided. Thus, the sliding component may be removed and the removed sliding component may be replaced by a re-placement sliding component.

A wind turbine with a tower, a nacelle and a yaw bearing, wherein the yaw bearing is arranged and prepared for rotating the nacelle relative to the tower around a yaw axis is provided. The yaw bearing has a first yaw bearing component which is fixed to the tower, a second yaw bearing component which is fixed to the nacelle, and at least one sliding component which is located between the first yaw bearing component and the second yaw bearing component. The wind turbine is prepared and arranged for housing at least one lifting device for lifting the nacelle relative to the tower such that the sliding component can be removed. Furthermore, a method of lifting the nacelle relative to the tower is provided. Thus, the sliding component may be removed and the removed sliding component may be replaced by a re-placement sliding component.

A system for repairing dents in a wind turbine tower section may generally include a dent repair tool having a tool hub and a plurality of arms configured to extend radially outwardly from the tool hub towards an inner surface of the tower section. The tool may also include a linear actuator configured to linearly actuate a plunger of the actuator arm relative to the tool hub such that the plunger applies a radially outward force against the inner surface of the tower section at or adjacent to a location of a dent formed in the tower section. In addition, the system may include a load sensor configured to provide an indication of a load associated with the radially outward force applied against the inner surface of the tower section by the plunger and a controller configured to monitor the load based on signals received from the load sensor.