A telescopic mast includes: a tubular main body in which a power supply signal wire is embedded; one or more tubular sections coupled to be withdrawn from or insertable into the tubular main body; one or more coupling members which are provided at the top ends of the tubular main body and the tubular sections to fix or release the coupling between the tubular main body and the tubular sections during a withdrawn or insertion operation of the tubular sections; and a power supply coupling member which is connected to the power supply signal wire embedded in the tubular main body to supply power thereto.

A telescopic mast includes: a tubular main body in which a power supply signal wire is embedded; one or more tubular sections coupled to be withdrawn from or insertable into the tubular main body; one or more coupling members which are provided at the top ends of the tubular main body and the tubular sections to fix or release the coupling between the tubular main body and the tubular sections during a withdrawn or insertion operation of the tubular sections; and a power supply coupling member which is connected to the power supply signal wire embedded in the tubular main body to supply power thereto.

In a preferred embodiment of the invention there is a post comprising a plurality of poles 5 located in and extending from a ground surface adjacent to one another. A sleeve 1 is arranged around the poles 5 so that the sleeve and poles combine to provide a shaft. In this embodiment each pole has a tapered ground-engaging end 6 and the sleeve has a large compartment 2 for two of the poles 5 and a small compartment 3 for one of the poles.

In a preferred embodiment of the invention there is a post comprising a plurality of poles 5 located in and extending from a ground surface adjacent to one another. A sleeve 1 is arranged around the poles 5 so that the sleeve and poles combine to provide a shaft. In this embodiment each pole has a tapered ground-engaging end 6 and the sleeve has a large compartment 2 for two of the poles 5 and a small compartment 3 for one of the poles.

A utility pole system that provides for easy temperature inspection of the fiberglass reinforced plastic utility pole. The system may include utility pole and a sleeve arranged around the pole, and a temperature sensor positioned underneath the sleeve.

Provided is a wind turbine component for a wind turbine, in particular for a wind turbine tower and/or a rotor blade, to a wind turbine tower, to a rotor blade, to a wind turbine and to a method for producing a wind turbine component. Provided is a wind turbine component for a wind turbine, in particular for a wind turbine tower and/or a rotor blade, comprising a first wall element with a first inner surface and a first outer surface arranged opposite the latter, a corrugated structural element, wherein the structural element is arranged on the first inner surface or on the first outer surface, wherein the first wall element is connected to the structural element.

The invention relates to a fastening element for fastening a hollow composite pole to the ground at a location where a slit-formed opening is present in the ground, wherein the fastening element has a lower end portion that is configured for being positioned in the slit-formed opening, wherein a conical portion of the composite pole is abutting a conical upper portion of the fastening element.

A telescopic mast includes: a tubular main body in which a power supply signal wire is embedded; one or more tubular sections coupled to be withdrawn from or insertable into the tubular main body; one or more coupling members which are provided at the top ends of the tubular main body and the tubular sections to fix or release the coupling between the tubular main body and the tubular sections during a withdrawn or insertion operation of the tubular sections; and a power supply coupling member which is connected to the power supply signal wire embedded in the tubular main body to supply power thereto.

A telescopic mast includes: a tubular main body in which a power supply signal wire is embedded; one or more tubular sections coupled to be withdrawn from or insertable into the tubular main body; one or more coupling members which are provided at the top ends of the tubular main body and the tubular sections to fix or release the coupling between the tubular main body and the tubular sections during a withdrawn or insertion operation of the tubular sections; and a power supply coupling member which is connected to the power supply signal wire embedded in the tubular main body to supply power thereto.

A composite crossarm fixed on a pole body of a transmission pole is disclosed. The composite crossarm includes: a core rod, an insulating layer and a load-bearing member. The insulating layer and the load-bearing member cover and are fixed to an outer peripheral surface of the core rod. The load-bearing member is positioned in a middle region of the core rod connected to the pole body, and the insulating layer is positioned in regions of the core rod other than the middle region. A transmission pole using the above composite crossarm is also disclosed. In the above manner, the load-bearing member is arranged at a position where the core rod is connected to the pole body in advance. On one hand, the core rod is able to be connected to the pole body without providing with a hole. On the other hand, the load caused by the fixed connection is applied on the load-bearing member directly, with no damage to the insulating layer. Both the load-bearing member and the insulating layer cover and are fixed on the outer peripheral surface of the core rod, so that the core rod is protected from external corrosion, to ensure the mechanical properties of the composite crossarm.