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1. WO2011006526 - TELESCOPIC TOWER ASSEMBLY AND METHOD

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[ EN ]

Claims

1. Method of erecting a structure on a site using a plurality of substantially coaxial telescopic sections (2, 3, 4),

the method being characterized in that it comprises:

a first step of placing or constructing an innermost one (4) of said plurality of sections (2, 3, 4) in position on the site,

a second step of placing or constructing, in position on site, (4), one or more substantially coaxial sections around said innermost section, so as to form two or more substantially coaxial telescopic sections, each of said coaxial telescopic sections having an inner and/or an outer coaxially adjacent section,

a third step of fitting a plurality of jacking tendons (5) between lower jacking points (7) of a first one of said telescopic sections (3, 4), and upper jacking points (6) of a second one of said telescopic sections, said first and second telescopic sections being coaxially adjacent,

a fourth step of attaching a tendon jack (8) to one or more of said plurality of jacking tendons (5),

a fifth step of operating the tendon jacks (8) to apply tension to the jacking tendons (5) such that the weight of the first section (3, 4) is supported by the upper jacking points of the second section (2), and

a sixth step of operating said tendon jacks to lift the first section (3, 4) with respect to the second section (2).

2. Method according to claim 1 , further comprising a seventh step of securing a lower part of the first section (3, 4) to an upper part of the second section (2).

3. Method according to claim 1 or 2, wherein

the second step is performed so as to form three or more substantially coaxial telescopic sections comprising two or more pairs of coaxially adjacent sections,

the third to sixth or seventh steps are performed for each of the two or more pairs of coaxially adjacent sections.

4. Method according to one of claims 1 to 3, wherein the structure is a tower for supporting a top-mounted element (40, 44) on an uppermost one of the telescopic sections, and wherein the method further comprises an eighth step, performed before the sixth step, of placing the top-mounted element into position on a predetermined one of the telescopic sections.

5. Method according to one of claims 4, wherein the top-mounted element is a wind-turbine generator unit 40.

6. Method according to claim 5, wherein the eighth step comprises fitting the wind turbine generator unit (40) to the top of the predetermined telescopic section and fitting turbine blades (41 ) such that the rotation plane of turbine blades (41 ) is maintained at an angle from the operational rotation plane of the blades (41 ) during the lifting subsequently performed in the sixth step, and wherein the method further comprises a ninth step of moving the rotation plane of the turbine blades (41 ) to their operational rotation plane during or after the execution of sixth step once the predetermined telescopic section has been raised above a height at which the turbine blades (41 ), when in their operational rotation plane, are clear of obstructions.

7. Method according to one of claims 1 to 6, wherein the second step of constructing comprises assembling the or each coaxial section (2, 3, 4) from a plurality of pre-fabhcated segments (21 , 22, 23).

8. Method according to claim 7, wherein the second step further comprises fastening the pre-fabricated segments together using tensionable lateral connecting elements (25, 26).

9. Method according to one of claims 1 to 8, wherein the sections (2, 3, 4) are made of concrete.

10. Method according to one of claims 1 to 9, the method further comprising a sequence of dismantling steps including performing some or all of said first to ninth steps in reverse so as to dismantle the structure.

11. Method according to one of claims 1 to 6, wherein the first and/or second step of constructing comprises providing a mould, former or shuttering, and casting the sections (2, 3, 4).

12. Method according to one of claims 1 to 11 , further comprising a preliminary step of constructing a foundation (1 ) for the structure, the foundation having a recessed access area for permitting access to the underside of at least some of the plurality of telescopic sections (3, 4) placed or constructed in the first or second steps.

13. Pre-fabricated tower section segment (21 , 22, 23) for joining with one or more other similar tower segments (21 , 22, 23) to form a section of the height of a tower structure, the section being for joining with other similar sections to form the tower structure,

the tower segment being characterised in that it comprises:

upper jacking points (6) and/or lower jacking points (7) for attaching jacking tendons (5),

one or more first mating surfaces for fixably engaging with corresponding mating surfaces of the other similar tower segments (21 , 22, 23), segment fastening points (25) for attaching first tensioning means (26) such that the or each first mating surface is tensionably secured to a corresponding mating surface of the other similar tower segments (21 , 22, 23),

one or more second mating surfaces for, when the tower segment is fixably engaged with the other similar tower segments to form the section of the height of the tower structure, fixably engaging with corresponding mating surfaces of an adjacent upper and/or a lower section of the tower structure, and

section fastening points for attaching second tensioning means such that the or each second mating surface is tensionably secured to a

corresponding mating surface of the adjacent upper and/or lower section of the tower structure.

14. Prefabricated tower section segment (21 , 22, 23) according to claim 13, wherein said upper jacking points (6) and/or said lower jacking points (7) are implemented as a flange provided at or near an upper and/or lower edge, respectively, of the tower segment , the or each flange comprises openings for tensionably accommodating the jacking tendons (5).

15. Tower structure comprising a plurality of pre-fabhcated tower section segments (21 , 22, 23) according to claim 13 or 14 and assembled using a method according to one of claims 1 to 12.