Precast concrete post tensioned segmented wind turbine tower
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-011/04
E04H-012/16
출원번호
US-0957596
(2013-08-02)
등록번호
US-9175670
(2015-11-03)
발명자
/ 주소
Lockwood, James D.
Lockwood, William D.
출원인 / 주소
Lockwood, James D.
대리인 / 주소
Holland & Hart, LLP
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
A post-tensioned precast segmental concrete tower has a stack of annular segments with uniform cross-sections which varies over the tower height. The transition between tower segments occurs in stages and is achieved using annular members or segments which support and anchor post-tensioning tendons
A post-tensioned precast segmental concrete tower has a stack of annular segments with uniform cross-sections which varies over the tower height. The transition between tower segments occurs in stages and is achieved using annular members or segments which support and anchor post-tensioning tendons that transfer loads passing through the tower as a result of a change in tower geometry. The tower segments are match cast against one another in fabrication to create tight matching opposing surfaces when placed into the tower and to create tight joints. The match casting eliminates the need for grout between precast segments, resulting in a faster tower erection time and high durability of the joints. All annular segments have horizontal joints and no vertical joints. The tower geometry simplifies the formwork system used to precast the segments, and the post-tensioning tendons tie all segments together and to the foundation.
대표청구항▼
1. A vertical precast concrete stepped tower adapted for supporting a wind turbine, comprising a base member positioned to support said tower,a first plurality of substantially identical precast concrete annular and cylindrical lower tower segments having the same diameter and supported by said base
1. A vertical precast concrete stepped tower adapted for supporting a wind turbine, comprising a base member positioned to support said tower,a first plurality of substantially identical precast concrete annular and cylindrical lower tower segments having the same diameter and supported by said base member to form a vertical stack of successive said lower tower segments,a first precast concrete annular and circular transition segment mounted on top of said stack of said lower tower segments, with said first transition segment having a frusto-conical outer surface,a second plurality of substantially identical precast concrete annular and cylindrical intermediate tower segments having a diameter smaller than said diameter of said lower tower segments,said annular intermediate tower segments arranged to form a second vertical stack of successive said intermediate tower segments on top of said first precast concrete transition segment,a second precast concrete annular and circular transition segment mounted on top of said stack of intermediate tower segments, with said second transition segment having a frusto-conical outer surface,a third plurality of substantially identical precast concrete annular and cylindrical upper tower segments having a diameter smaller than said diameter of said intermediate tower segments,said upper tower segments arranged to form a third vertical stack of successive upper tower segments on top of said second precast concrete transition segment, anda series of vertically extending post tensioning tendons positioned within a chamber defined by said first, second and third plurality of said annular tower segments and each said transition segment and connecting all of said annular tower segments and said annular transition segments together,match-cast annular joints between said annular tower segments, the joints comprising: a flat annular surface proximate an outer surface of the annular tower segments, andan inclined annular surface is contiguous with the annular flat surface and forms an obtuse angle with respect to the flat annular surface wherein the inclined annular surface is spaced apart from the outer surface of the annular tower segment. 2. A precast concrete tower according to claim 1 wherein adjacent said precast annular tower segments in each said stack and each said precast annular transition segment adjacent said tower segments are connected by annular match-cast opposing surfaces forming precision annular joints between all of said adjacent segments. 3. A precast concrete tower according to claim 2 wherein said annular match-cast opposing surfaces of all of said adjacent precast annular tower segments and all of said precast annular transition segments have interfitting tapered shear keys. 4. A precast concrete tower according to claim 1 wherein each said vertical stack of annular and cylindrical tower segments includes at least five of the corresponding said tower segments of the same diameter. 5. A vertical precast concrete stepped tower adapted for supporting a wind turbine, comprising a base member positioned to support said tower,a first plurality of substantially identical precast concrete annular and cylindrical lower tower segments having the same diameter and supported by said base member to form a vertical stack of successive said lower tower segments,a first precast concrete annular and circular transition segment mounted on top of said stack of said lower tower segments, with said first transition segment having a frusto-conical outer surface,a second plurality of substantially identical precast concrete annular and cylindrical intermediate tower segments having a diameter smaller than said diameter of said lower tower segments,said annular intermediate tower segments arranged to form a second vertical stack of successive said intermediate tower segments on top of said first precast concrete transition segment,a second precast concrete annular and circular transition segment mounted on top of said stack of intermediate tower segments, with said second transition segment having a frusto-conical outer surface,a third plurality of substantially identical precast concrete annular and cylindrical upper tower segments having a diameter smaller than said diameter of said intermediate tower segments,said upper tower segments arranged to form a third vertical stack of successive upper tower segments on top of said second precast concrete transition segment,adjacent said precast annular tower segments in each said stack and each said precast annular transition segment adjacent said tower segments being connected by annular match-cast opposing surfaces forming precision annular joints between all of said adjacent segments,said annular match-cast opposing surfaces of all of said adjacent precast annular tower segments and all of said precast annular transition segments having interfitting tapered shear keys,match-cast annular joints between said annular tower segments, the joints comprising: a flat annular surface that proximate an outer surface of the annular tower segments, andan inclined annular surface that is contiguous with the annular flat surface that forms an obtuse angle with respect to the flat annular surface anda series of vertically extending post tensioning tendons positioned within a chamber defined by said first, second and third plurality of said annular tower segments and each said transition segment and connecting all of said annular tower segments and said annular transition segments together. 6. A precast concrete tower according to claim 5 wherein said second precast concrete annular transition segment includes an inner annular portion receiving and confining said post tensioning tendons.
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이 특허에 인용된 특허 (10)
Zavitz, Bryant A.; Kirkley, Kevin L., Base support for wind-driven power generators.
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