WO2011110749A1 - Method in connection with a foundation for tower-like structures and a foundation for tower-like structures - Google Patents

Method in connection with a foundation for tower-like structures and a foundation for tower-like structures Download PDF

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Publication number
WO2011110749A1
WO2011110749A1 PCT/FI2011/050212 FI2011050212W WO2011110749A1 WO 2011110749 A1 WO2011110749 A1 WO 2011110749A1 FI 2011050212 W FI2011050212 W FI 2011050212W WO 2011110749 A1 WO2011110749 A1 WO 2011110749A1
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WO
WIPO (PCT)
Prior art keywords
foundation
tower
structures
steel
steel tendons
Prior art date
Application number
PCT/FI2011/050212
Other languages
French (fr)
Inventor
Kari Tuominen
Original Assignee
Peikko Group Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peikko Group Oy filed Critical Peikko Group Oy
Priority to EP11752916A priority Critical patent/EP2545222A1/en
Publication of WO2011110749A1 publication Critical patent/WO2011110749A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/16—Prestressed structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/32—Foundations for special purposes
    • E02D27/42—Foundations for poles, masts or chimneys
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
    • E04H12/02—Structures made of specified materials
    • E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/728—Onshore wind turbines

Definitions

  • the invention relates to a method in connection with a foundation for tower-like structures, in which method the tower and the foundation are formed as steel-reinforced concrete structures.
  • the invention also relates to a foundation for tower-like structures, in which the tower and the foundation are formed as steel-reinforced concrete structures.
  • the invention relates to tower-like structures made from a concrete material, such as smokestacks, wind turbine towers and other high, mast-like structures.
  • post-stressing methods are often used, i.e. methods using anchor tendons.
  • the fundamental idea of the method is illustrated, for example, in the certified product declaration no. 84 of the Concrete Association of Finland.
  • the goal of the method is to decrease deformations in the tower and, at the same time, to increase the bending moment capacity of the tower.
  • the purpose of the invention is to provide a method in connection with a foundation for tower-like structures and a foundation for tower-like struc- tures, by which the disadvantages of prior known art can be eliminated. This is achieved by a method and a foundation according to the invention.
  • the method according to the invention in connection with a foundation for tower-like structures is characterized in that the steel tendons of the tower are guided to the edges of the foundation and anchored to the edges of the foundation and that post-stressing of the tower and the foundation is carried out simultaneously.
  • the foundation for tower-like structures according to the invention is characterized in that the steel tendons of the tower are guided to the foundation, adapted to extend to the edges of the foundation and anchored to the edges of the foundation.
  • An advantage of the invention is the simplicity, along with which is achieved significant saving in costs during the construction stage of the tower in comparison to previously used technology. Further, an advantage of the invention is that the disadvantages associated with the capillary pumps that appeared in connection with prior known art can be eliminated in a particularly effective manner.
  • Fig. 1 shows a structure according to the invention as a principle drawing viewed from the side
  • Fig. 2 shows a structure according to Fig. 1 as a principle drawing viewed from the top
  • Fig. 3 shows a structure according to Figs. 1 and 2 as a perspective drawing viewed from the upper oblique
  • Fig. 4 shows an upper part of the tower of a structure according to Figs. 1-3, as a side drawing viewed on a larger scale
  • Fig. 5 shows a detail of Fig. 1 as a drawing viewed on a larger scale
  • Fig. 6 shows a structure according to Figs. 1-5 as a perspective drawing viewed from the upper oblique
  • Fig. 7 shows an example of an anchoring application for steel tendons as a principle drawing viewed from the side.
  • Figs. 1-6 show in principle a tower-like structure and a foundation for a tower-like structure according to the invention.
  • the tower is presented in general with the reference numeral 1 and, respectively, the foundation with the reference numeral 2.
  • the steel tendons 3 of the tower 1 i.e. the pre-/post-stressing steel tendons, are guided to the edges of the plate formed by the foundation 2.
  • the steel tendons 3 are anchored to the edges of the plate formed by the foundation 2.
  • An essential characteristic of the method according to the invention is, further, that post-stressing of the tower 1 and the foundation 2 is carried out simultaneously. Stressing can be carried out by any device known per se, for example, by a hydraulic jack. The factors related to stressing are known per se to the person skilled in the art, thus the factors in question are not presented in greater detail in this connection.
  • the steel tendons 3 of the tower 1 are guided continuously from the tower 1 to the plate-like foundation 2 such that the steel tendons 3 turn from a vertical position into a horizontal position.
  • the steel tendons 3 extend onward in a horizontal position to the edges of the foundation 2.
  • the steel tendons 3 are anchored to the edges of the plate formed by the foundation 2.
  • the steel tendons 3 are stress strands that can be any elements known per se.
  • the steel tendons can be individual tendon stands or tendon strand groups made up of several tendon strands.
  • the steel tendons 3 are anchored to the edges of the plate functioning as the foundation 2 by any suitable anchoring means.
  • Fig. 7 shows an example of anchoring known per se.
  • Fig. 7 the same reference numerals are used at corresponding points as in Figs. 1-6.
  • the reference numeral 4 is used to designate the duct, in which the steel tendons run, and the reference numeral 5 to designate in general the anchoring means, by which the steel tendons are anchored into the concrete.
  • the anchoring means is also shown with the reference numeral 5 in Figs. 1-6.
  • the invention uses thus a tendon stressing method known per se, in which anchor tendons are used.
  • tendon stressing method the tendon force is transferred into the structure by an anchoring frame and anchor- ing plate.
  • the steel tendons are locked to the anchoring plate by wedges. Locking can be carried out, for example, by the hydraulic jack used in stressing.
  • Anchors can be either active anchors or fixed, i.e. passive anchors. After stressing, the steel tendons are protected from corrosion using injection mortar, wherein adhesion between the tendon steel and the structure is also created.
  • Placement of the steel tendons 3 can be formed freely according each particular situation.
  • the example of Figs. 1-6 shows a solution optimally suited for the situation in question, in which the foundation 2 is formed from a circular plate and the steel tendons turn from the tower 1 to the horizontal direc- tion and extend onwards in the horizontal direction radially and at even intervals from the lower part of the tower 1 toward the edges of the plate formed by the foundation 2.
  • the example according to Figs. 1-6 is, however, not the only alternative, rather the steel tendons 3 can be freely adapted in any suitable position depending on the situation in question and the foundation.
  • the steel tendons 3 can be placed on the upper surface of the foundation or on the lower surface of the foundation.
  • the example of Figs. 1-6 shows a third alternative that is a combination of the previous examples, i.e. a structure, in which the steel tendons 3 are placed on the upper and lower surfaces of the foundation 2.
  • the embodiment example of the invention presented above is not intended to limit the invention in any way, rather the invention can be completely freely modified within the scope of the claims.
  • the number of steel tendons can naturally vary freely according to each particular situation.
  • the foundation 2 is formed from a circular plate. However, this is not the only possibility, rather plates of another type of shape are also possible.

Abstract

The object of the invention is a method in connection with a foundation for tower-like structures and a foundation. The tower (1) and the foundation (2) are formed as steel-reinforced concrete structures. The steel tendons (3) of the tower (1) are guided to the edges of the foundation (2) and anchored to the edges of the foundation (2). Post-stressing of the tower (1) and the foundation (2) is carried out simultaneously.

Description

Method in connection with a foundation for tower-like structures and a foundation for tower-like structures
The invention relates to a method in connection with a foundation for tower-like structures, in which method the tower and the foundation are formed as steel-reinforced concrete structures. The invention also relates to a foundation for tower-like structures, in which the tower and the foundation are formed as steel-reinforced concrete structures.
The invention relates to tower-like structures made from a concrete material, such as smokestacks, wind turbine towers and other high, mast-like structures.
The problems of tower-like structures are created by their thin structure and the varying load caused by wind. Because the load varies, in an unstressed structure, concrete cracks open and close continuously. Together with water there is a danger that capillary pumps will be created along the cracks. In concrete structures, this can lead to speedy erosion and thereby to significant repair costs and, in the worst case, even to dangerous situations.
In towers with concrete structures, post-stressing methods are often used, i.e. methods using anchor tendons. The fundamental idea of the method is illustrated, for example, in the certified product declaration no. 84 of the Concrete Association of Finland. The goal of the method is to decrease deformations in the tower and, at the same time, to increase the bending moment capacity of the tower.
Up until this time, tower foundations have been non-stressed solu- tions provided with ordinary reinforcement steel. In such a structure, the steel tendons of the tower are anchored in the foundation and, in this case, the different details of the solution are expensive and difficult to implement.
The purpose of the invention is to provide a method in connection with a foundation for tower-like structures and a foundation for tower-like struc- tures, by which the disadvantages of prior known art can be eliminated. This is achieved by a method and a foundation according to the invention. The method according to the invention in connection with a foundation for tower-like structures is characterized in that the steel tendons of the tower are guided to the edges of the foundation and anchored to the edges of the foundation and that post-stressing of the tower and the foundation is carried out simultaneously. The foundation for tower-like structures according to the invention is characterized in that the steel tendons of the tower are guided to the foundation, adapted to extend to the edges of the foundation and anchored to the edges of the foundation.
An advantage of the invention is the simplicity, along with which is achieved significant saving in costs during the construction stage of the tower in comparison to previously used technology. Further, an advantage of the invention is that the disadvantages associated with the capillary pumps that appeared in connection with prior known art can be eliminated in a particularly effective manner.
In the following, the invention is described in greater detail by way of example depicted in the accompanying drawing, wherein
Fig. 1 shows a structure according to the invention as a principle drawing viewed from the side,
Fig. 2 shows a structure according to Fig. 1 as a principle drawing viewed from the top,
Fig. 3 shows a structure according to Figs. 1 and 2 as a perspective drawing viewed from the upper oblique,
Fig. 4 shows an upper part of the tower of a structure according to Figs. 1-3, as a side drawing viewed on a larger scale,
Fig. 5 shows a detail of Fig. 1 as a drawing viewed on a larger scale,
Fig. 6 shows a structure according to Figs. 1-5 as a perspective drawing viewed from the upper oblique, and
Fig. 7 shows an example of an anchoring application for steel tendons as a principle drawing viewed from the side.
Figs. 1-6 show in principle a tower-like structure and a foundation for a tower-like structure according to the invention. In the figures, the tower is presented in general with the reference numeral 1 and, respectively, the foundation with the reference numeral 2.
In Figs. 1-6, the steel tendons are designated with the reference numeral 3. For purposes of clarity, no other reinforcement bars are designated in the figures. To the person skilled in the art it is, however, natural that the structure has along with it all necessary reinforcements and other comparable elements, thus the factors in question are not shown in the figures. For purposes of clarity, the accompanying figures depict as visible only those elements that are essential for the invention.
According to the essential idea of the invention, the steel tendons 3 of the tower 1 , i.e. the pre-/post-stressing steel tendons, are guided to the edges of the plate formed by the foundation 2. The steel tendons 3 are anchored to the edges of the plate formed by the foundation 2.
An essential characteristic of the method according to the invention is, further, that post-stressing of the tower 1 and the foundation 2 is carried out simultaneously. Stressing can be carried out by any device known per se, for example, by a hydraulic jack. The factors related to stressing are known per se to the person skilled in the art, thus the factors in question are not presented in greater detail in this connection.
As can be seen from Figs. 1-6, the steel tendons 3 of the tower 1 are guided continuously from the tower 1 to the plate-like foundation 2 such that the steel tendons 3 turn from a vertical position into a horizontal position. In the foundation 2, the steel tendons 3 extend onward in a horizontal position to the edges of the foundation 2. The steel tendons 3 are anchored to the edges of the plate formed by the foundation 2.
The steel tendons 3 are stress strands that can be any elements known per se. The steel tendons can be individual tendon stands or tendon strand groups made up of several tendon strands. The steel tendons 3 are anchored to the edges of the plate functioning as the foundation 2 by any suitable anchoring means. Fig. 7 shows an example of anchoring known per se.
In Fig. 7, the same reference numerals are used at corresponding points as in Figs. 1-6. In Fig. 7, the reference numeral 4 is used to designate the duct, in which the steel tendons run, and the reference numeral 5 to designate in general the anchoring means, by which the steel tendons are anchored into the concrete. The anchoring means is also shown with the reference numeral 5 in Figs. 1-6.
In relation to Fig. 7, it must be noted that the anchoring solution presented in Fig. 7 is only a principle example known per se, the purpose of which is to clarify the anchoring to the edges of the foundation of the steel tendons used in the invention. The invention is in no way limited to the example in question, rather any suitable anchoring solution can be used in connection with the invention.
The invention uses thus a tendon stressing method known per se, in which anchor tendons are used. In above-said tendon stressing method, the tendon force is transferred into the structure by an anchoring frame and anchor- ing plate. The steel tendons are locked to the anchoring plate by wedges. Locking can be carried out, for example, by the hydraulic jack used in stressing. Anchors can be either active anchors or fixed, i.e. passive anchors. After stressing, the steel tendons are protected from corrosion using injection mortar, wherein adhesion between the tendon steel and the structure is also created.
The tendon stressing method presented above and all the factors related thereto are well-known to the skilled person in the art, thus the factors in question are not presented in greater detail in this connection.
Placement of the steel tendons 3 can be formed freely according each particular situation. The example of Figs. 1-6 shows a solution optimally suited for the situation in question, in which the foundation 2 is formed from a circular plate and the steel tendons turn from the tower 1 to the horizontal direc- tion and extend onwards in the horizontal direction radially and at even intervals from the lower part of the tower 1 toward the edges of the plate formed by the foundation 2. The example according to Figs. 1-6 is, however, not the only alternative, rather the steel tendons 3 can be freely adapted in any suitable position depending on the situation in question and the foundation.
The steel tendons 3 can be placed on the upper surface of the foundation or on the lower surface of the foundation. The example of Figs. 1-6 shows a third alternative that is a combination of the previous examples, i.e. a structure, in which the steel tendons 3 are placed on the upper and lower surfaces of the foundation 2.
The embodiment example of the invention presented above is not intended to limit the invention in any way, rather the invention can be completely freely modified within the scope of the claims. The number of steel tendons can naturally vary freely according to each particular situation. In the example shown in the figures, the foundation 2 is formed from a circular plate. However, this is not the only possibility, rather plates of another type of shape are also possible.

Claims

Claims
1. A method in connection with a foundation for tower-like structures, in which method the tower (1 ) and the foundation (2) are formed as steel- reinforced concrete structures, characterized in that the steel tendons (3) of the tower (1 ) are guided to the edges of the foundation (2) and anchored to the edges of the foundation (2) and that post-stressing of the tower (1 ) and the foundation (2) is carried out simultaneously.
2. A method according to claim 1 , characterized in that tendons strands are used as the steel tendons (3).
3. A method according to claim 1 , characterized in that the steel tendons (3) of the tower are guided to the upper surface of the foundation (2).
4. A method according to claim 1 , characterized in that the steel tendons (3) of the tower (1 ) are guided to the lower surface of the foundation (2).
5. A method according to claim 1 , characterized in that the steel tendons (3) of the tower (1 ) are guided to the upper surface and lower surface of the foundation (2).
6. A foundation for tower-like structures, in which the tower (1) and the foundation (2) are formed as steel-reinforced concrete structures, characterized in that the steel tendons (3) of the tower (1 ) are guided to the foundation (2), adapted to extend to the edges of the foundation (2) and anchored to the edges of the foundation (2).
7. A foundation for tower-like structures according to claim 6, characterized in that the steel tendons (3) are tendon strands.
8. A foundation for tower-like structures according to claim 6, char- acterized in that the steel tendons (3) of the tower (1 ) are guided to the lower surface of the foundation (2).
9. A foundation for tower-like structures according to claim 6, characterized in that the steel tendons (3) of the tower (1 ) are guided to the upper surface of the foundation (2).
10. A foundation for tower-like structures according to claim 6, characterized in that the steel tendons (3) of the tower (1 ) are guided to the upper surface and lower surface of the foundation (2).
PCT/FI2011/050212 2010-03-12 2011-03-11 Method in connection with a foundation for tower-like structures and a foundation for tower-like structures WO2011110749A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11752916A EP2545222A1 (en) 2010-03-12 2011-03-11 Method in connection with a foundation for tower-like structures and a foundation for tower-like structures

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20105250A FI122076B (en) 2010-03-12 2010-03-12 Method for foundation of tower-like structures and foundation of tower-like structures
FI20105250 2010-03-12

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WO2011110749A1 true WO2011110749A1 (en) 2011-09-15

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WO (1) WO2011110749A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014021927A2 (en) * 2012-08-03 2014-02-06 Lockwood James D Precast concrete post tensioned segmented wind turbine tower
WO2016116645A1 (en) * 2015-01-22 2016-07-28 Ingecid Investigación Y Desarrollo De Proyectos, S.L. Concrete tower
US9670909B2 (en) 2013-08-19 2017-06-06 Wobben Properties Gmbh Wind turbine foundation and wind turbine
JP2017125359A (en) * 2016-01-15 2017-07-20 三井造船株式会社 Foundation structure of towering structure

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498013A (en) * 1972-05-12 1974-01-24
EP0960986A2 (en) * 1998-05-27 1999-12-01 Wilfried Arand Process and device for the construction of tall, hollow, towerlike structures of two hundred meters height and more, specially wind generator towers
EP1262614A2 (en) * 2001-06-01 2002-12-04 Oevermann GmbH & Co. KG, Hoch- und Tiefbau Prestressed concrete tower
EP1705313A2 (en) * 2004-03-24 2006-09-27 Peem, spol. s.r.o. Reinforced console column and the method of its production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS498013A (en) * 1972-05-12 1974-01-24
EP0960986A2 (en) * 1998-05-27 1999-12-01 Wilfried Arand Process and device for the construction of tall, hollow, towerlike structures of two hundred meters height and more, specially wind generator towers
EP1262614A2 (en) * 2001-06-01 2002-12-04 Oevermann GmbH & Co. KG, Hoch- und Tiefbau Prestressed concrete tower
EP1705313A2 (en) * 2004-03-24 2006-09-27 Peem, spol. s.r.o. Reinforced console column and the method of its production

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014021927A2 (en) * 2012-08-03 2014-02-06 Lockwood James D Precast concrete post tensioned segmented wind turbine tower
WO2014021927A3 (en) * 2012-08-03 2014-05-30 Lockwood James D Precast concrete post tensioned segmented wind turbine tower
US9175670B2 (en) 2012-08-03 2015-11-03 James D. Lockwood Precast concrete post tensioned segmented wind turbine tower
US9670909B2 (en) 2013-08-19 2017-06-06 Wobben Properties Gmbh Wind turbine foundation and wind turbine
WO2016116645A1 (en) * 2015-01-22 2016-07-28 Ingecid Investigación Y Desarrollo De Proyectos, S.L. Concrete tower
JP2017125359A (en) * 2016-01-15 2017-07-20 三井造船株式会社 Foundation structure of towering structure

Also Published As

Publication number Publication date
EP2545222A1 (en) 2013-01-16
FI20105250A0 (en) 2010-03-12
FI122076B (en) 2011-08-15

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