A stealth pole includes a plurality of canister sections, each of the plurality of canister sections including a spine, a first splice plate located on a first end of the spine, a second splice plate located on a second end of the spine, and a canister cover that covers the spine, the first splice plate and the second splice plate. A method for reinforcing the stealth pole includes removing the canister cover from at least one of the plurality of canister sections; attaching a plurality of stiffener members to the first splice plate and the second splice plate; and applying tension, compression or a combination thereof to the plurality of stiffener members. The plurality of stiffener members reinforce the spine of the canister section. A reinforced stealth pole is also described.

A stealth pole includes a plurality of canister sections, each of the plurality of canister sections including a spine, a first splice plate located on a first end of the spine, a second splice plate located on a second end of the spine, and a canister cover that covers the spine, the first splice plate and the second splice plate. A method for reinforcing the stealth pole includes removing the canister cover from at least one of the plurality of canister sections; attaching a plurality of stiffener members to the first splice plate and the second splice plate; and applying tension, compression or a combination thereof to the plurality of stiffener members. The plurality of stiffener members reinforce the spine of the canister section. A reinforced stealth pole is also described.

A method for pretensioning a tower of a wind power installation, comprising the steps: providing a tensioning device having an adapter element and/or a foundation arrangement and a tensioning element, and/or an adapter element and/or a foundation arrangement, fastening a lower end of a tensioning element a fastening means of the adapter element, fastening an upper end of a tensioning element to an upper end of the tower, tensioning the tensioning element at the lower end of the tensioning element and/or at the upper end of the tensioning element, wherein the tensioning of the tensioning element is effected by reduction of a clearance between the foundation and the adapter element.

A method for pretensioning a tower of a wind power installation, comprising the steps: providing a tensioning device having an adapter element and/or a foundation arrangement and a tensioning element, and/or an adapter element and/or a foundation arrangement, fastening a lower end of a tensioning element a fastening means of the adapter element, fastening an upper end of a tensioning element to an upper end of the tower, tensioning the tensioning element at the lower end of the tensioning element and/or at the upper end of the tensioning element, wherein the tensioning of the tensioning element is effected by reduction of a clearance between the foundation and the adapter element.

The object is attained by a method of erecting a wind turbine tower having a plurality of tower segments which are tensioned by means of tensioning members. A plurality of tensioning members is provided and a fixing unit is fixed at an end of the tensioning members. Fixing of the fixing unit is effected by placing a multi-part wedge unit at a free end of the tensioning members which comprise a plurality of tensioning wires. A sleeve is fitted over the wedge unit and a pulling tab is fixed on or at the sleeve. The pulling tab has an opening. A cable is fixed at or in the hole in the pulling tab. The cable with the fixing unit and thus the tensioning members is pulled upwardly. The fixing unit is fixed at a segment of the tower, that is to be fixed. The sleeve is removed before the tensioning member is braced.

The object is attained by a method of erecting a wind turbine tower having a plurality of tower segments which are tensioned by means of tensioning members. A plurality of tensioning members is provided and a fixing unit is fixed at an end of the tensioning members. Fixing of the fixing unit is effected by placing a multi-part wedge unit at a free end of the tensioning members which comprise a plurality of tensioning wires. A sleeve is fitted over the wedge unit and a pulling tab is fixed on or at the sleeve. The pulling tab has an opening. A cable is fixed at or in the hole in the pulling tab. The cable with the fixing unit and thus the tensioning members is pulled upwardly. The fixing unit is fixed at a segment of the tower, that is to be fixed. The sleeve is removed before the tensioning member is braced.

An apparatus and a method for relieving a tension strand, in particular a tension strand of a prestressed tower, preferably a prestressed concrete tower of a wind power plant. Furthermore, the disclosure relates to a method for dismantling a prestressed tower and to the use of an apparatus. The apparatus comprises a first anchoring unit with a first tension strand receptacle for a first section of the tension strand, a second anchoring unit with a second tension strand receptacle for a second section of the tension strand, and a lifting unit which is configured to change a spacing between the first and second anchoring unit.

An apparatus and a method for relieving a tension strand, in particular a tension strand of a prestressed tower, preferably a prestressed concrete tower of a wind power plant. Furthermore, the disclosure relates to a method for dismantling a prestressed tower and to the use of an apparatus. The apparatus comprises a first anchoring unit with a first tension strand receptacle for a first section of the tension strand, a second anchoring unit with a second tension strand receptacle for a second section of the tension strand, and a lifting unit which is configured to change a spacing between the first and second anchoring unit.

A method for retaining tension in a stressed tendon cast in a reinforced concrete structure includes removing concrete from the structure to expose the tendon, attaching a re-anchoring clamp to the exposed tendon, the re-anchoring clamp comprising two partial sections assembled to enclose the tendon, pouring grout around the re-anchoring clamp and allowing the grout to substantially cure.

A method for retaining tension in a stressed tendon cast in a reinforced concrete structure includes removing concrete from the structure to expose the tendon, attaching a re-anchoring clamp to the exposed tendon, the re-anchoring clamp comprising two partial sections assembled to enclose the tendon, pouring grout around the re-anchoring clamp and allowing the grout to substantially cure.