JP2017133248A - Base structure of tower structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base structure of a tower structure, which is a base structure of a tower structure, such as a prop, tower, etc., and in which, in the base structure comprising a column leg part fixed with unbound anchor to which prestress is subjected, generation of a crack on concrete is suppressed.SOLUTION: In a base having a structure where a base part 3b is formed on an upper part of footing parts 3a, onto an unbound anchor 5 which bridges a base plate 4 and an anchor plate 6 having a concentric circular shape to a tower structure 1 and to which prestress is subjected, vertical reinforcements 7a and 7b are arranged in parallel with a longitudinal direction of the unbound anchor. Lower end parts of the vertical reinforcements 7a and 7b extend to the footing parts 3a of a base 3. In order to suppress generation of crack, these are arranged, concrete is cast, and an outer peripheral surface of the base part 3b is covered with a reinforcement plate 11 so that pulling stress generated in concrete cast into the unbound anchor 5 is competed by confined effect.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation structure of a tower-like structure constructed up to a high position in the sky such as a pillar, a tower, a monument, etc. constructed on the ground, and particularly relates to a foundation structure using an unbonded anchor for introducing prestress. .

  There are various tower-like structures constructed on the ground, such as various towers, monuments, and chimneys. One of them is a tower for wind turbines, which is a column of wind turbines for wind power generation. At the top of the tower, there are a plurality of propeller blades (blades), and a generator that generates electricity by rotating the windmill, and a nacelle that becomes a heavy object such as a rotating mechanism that aligns the direction of the windmill with the windward Yes. Further, in order to stably increase the power generation efficiency, it is necessary to receive a stable wind, and it is desirable to place the top at a high position as much as possible. That is, in a windmill tower, it is necessary to extend a top part to a high position as much as possible, and to support a heavy article on the top part.

  In the tower-like structure, a large horizontal load is received by the wind in the sky. For this reason, a bending moment acts as a tipping moment on the foundation of the tower-like structure. In particular, in the tower for wind turbines, in addition to the horizontal load, a complex load is repeatedly applied by rotating the blades of the wind turbine, changing the direction of the wind turbine by the rotating mechanism, and the combination of these various loads. This may cause the windmill tower to fall over. In Japan, the overturning moment due to the seismic load is large, so a foundation structure that can handle earthquakes in addition to wind loads is desired.

  For example, a ground anchor combined pile method disclosed in Patent Document 1, a wind power generation tower disclosed in Patent Document 2, and Patent Document 3 disclosed as a proposal for a basic structure of a high-rise building or a tower-shaped structure. There is an anchor frame of the windmill tower. Further, in Patent Document 4, a column base hardware joined to the lower end of a steel column as a steel column base capable of securing anchor bolt fixing strength without increasing the size of the basic concrete is disclosed as basic concrete. A steel column base is disclosed which is fixed on foundation concrete with anchor bolts and nuts embedded therein.

  In addition, the applicant of the present application is a foundation structure of a tower-like structure such as a column or a tower, and in the foundation structure having a column base portion fixed by using an unbonded anchor that introduces prestress, the occurrence of cracks in the concrete is caused. The basic structure of the tower-like structure which suppresses as much as possible was proposed (refer patent document 5). The basic structure disclosed in Patent Document 5 is a tower-like structure in which the top portion extends to a high position in the sky, and at least an overturning moment, a horizontal force, and the like act by an external force acting on the top portion and the column base. In the basic structure of an object, the column base of the tower-like structure is fixed, an unbonded anchor for introducing prestress, a vertical bar arranged in a direction parallel to the unbonded anchor, and the vertical bar A hoop bar having a circumference arranged at an appropriate interval in the longitudinal direction of the vertical bar, and radial horizontal bars arranged in a direction intersecting the unbond anchor and the vertical bar, the unbond anchor and the vertical bar The concrete foundation is formed by driving concrete into the hoop bars and radial horizontal bars around the circumference.

  Further, in Non-Patent Document 1, a method for designing a columnar reinforcing bar of a rising portion (pedestal) of a footing foundation is described. Regarding the design of an anchor bolt, a connecting member joined to a bolt lower end with a nut or the like. Examine whether the stress caused by (anchoring) satisfies the concrete tolerance and the tolerance of the anchoring member itself, and whether the anchor bolt surface adheres to the concrete It is supposed to be.

  Further, in Non-Patent Document 2, the design is made with a smaller allowable pulling force determined by the cone-shaped fracture of the headed anchor bolt and a smaller allowable value of the anchor bolt member itself.

Japanese Patent Publication No. 5-59219 JP 2002-122066 A JP 2004-278400 A Japanese Patent Laid-Open No. 5-25832 Japanese Patent No. 4242445

Chimney structure design and construction guidelines (Japan Architecture Center) Various structural design guidelines (Architectural Institute of Japan)

  The support structure by the pile method disclosed in Patent Document 1 is mainly a building, which resists the buoyancy generated in the building by receiving a tipping moment due to a horizontal force caused by wind, earthquake, etc. Thus, when a complicated overturning moment occurs, reliability may not be ensured. Further, in the wind power generation tower disclosed in Patent Document 2, a tower body formed by stacking hollow cylinders and a prestressed concrete reinforcing member having a T-shaped cross section along the outer periphery on the base side of the tower body. The reinforcing member is coupled and fixed to the foundation and the tower body. In addition, an anchor frame disclosed in Patent Document 3 includes a pair of upper and lower ring-shaped anchor plates, a plurality of connection members that connect the pair of upper and lower anchor plates at a predetermined interval, and the connection between the connection members. A plurality of anchor bolts and a plurality of struts connected to the lower surface of the lower anchor plate for positioning the pair of upper and lower anchor plates at a predetermined height on the foundation, the connecting member and the struts Is made of steel pipe.

  In the basic structure disclosed in Patent Document 2 and Patent Document 3, a pedestal that is a base pedestal protruding from the center of the base member is formed, and a tower is fixed to the pedestal. And anchor bolts and struts. However, since the driven concrete and the anchor bolt are joined with adhesive force, if the falling moment is loaded and this adhesion breaks, the concrete will crack, and if the allowable stress of the concrete is exceeded, There is a risk of damaging the concrete. For this reason, it is desirable that the foundation has a structure that does not have adhesion between the anchor bolt and the concrete, and has a structure using an unbonded anchor that reduces the load on the concrete by changing the load transmission mechanism.

  Moreover, in the steel column base disclosed in Patent Document 4, the tensile force of the anchor bolt is transmitted to the reinforcing bar by satisfying the dimensional condition according to the present invention for the load generated in the horizontal direction in the concrete, and the cone It is said that the size of the foundation can be reduced by preventing the destruction of the state. However, the failure mechanism of concrete foundations is not limited to cone-like failure. Especially, in the tower for wind power generation, as mentioned above, heavy objects may be installed at the top of the tower. It is thought that the destruction mechanism works. Therefore, in the invention described in Patent Document 4, as the foundation structure of the tower-like structure in which the top portion extends to a high position in the sky like a windmill tower, there is a possibility that sufficient durability cannot be provided. In particular, it can be said that the rupture mechanism in a tower for wind power generation cannot secure sufficient strength only by cone-shaped fracture, which is a problem in the steel column base described in Patent Document 4.

  In addition, as disclosed in Non-Patent Document 5 and Non-Patent Document 6, the conventional tower-like structure foundation structure includes anchor bolts attached to concrete with reference to the pointers and the like, and nuts or the like at the lower end thereof. The connecting member (anchor ring) to be joined together is arranged at the rising part (pedestal) of the footing foundation, and is designed on the basis of resisting the overturning moment received from the upper structure by the columnar structure.

  The support structure of a tower-like structure (tower) typified by a chimney is a structure in which a pedestal that is a base pedestal protruding from the center of the base member is formed, and the tower is fixed to this pedestal. The fixing portion is composed of the anchor bolt and the connecting member (anchor ring) in the placed concrete. In addition, it is designed on the assumption that the concrete and the anchor bolt are bonded and joined. When a falling moment is loaded, a tensile force is transmitted through the concrete to the vertical reinforcing bars arranged beside the anchor bolt.

  On the other hand, for a wind turbine tower or the like, the natural period of the superstructure can be determined by fixing the legs. When it is desired to achieve this complete fixation or a state close to this, it is conceivable to use an unbonded anchor and to have a structure in which a tension force (prestress) is applied to the anchor bolt after the concrete is driven. In addition, a rotating machine such as a windmill may prestress the bolt for the purpose of preventing fatigue failure of the foundation bolt that is constantly subjected to load fluctuations.

  When prestress is applied using an unbonded anchor, tensile load acts on the concrete around the unbonded anchor in the vertical direction below the anchoring part (anchor ring) of the unbonded anchor and in the crossing direction (horizontal direction) of the unbonded anchor. Therefore, a stress state different from anchor bolts expected to adhere to concrete that does not apply prestress will occur, and if there is a lack of reinforcing bars necessary for prestressing, immediately after prestressing Even under normal load on the tower structure, cracks occur in the concrete, and when the cracks progress, the concrete may break along the unbonded anchors. The structure that resists the tipping moment of the leg by this structure transmits a tensile force through the concrete to the vertical reinforcing bars arranged in parallel to the anchor bolts, and the radial horizontal bars have a tipping moment. Resists horizontal tensile force generated on the compression side.

  Therefore, as disclosed in Patent Document 5, even when pre-stress is introduced using an unbonded anchor, the foundation does not cause harmful cracks in the concrete and can sufficiently resist the overturning moment. The above-mentioned problem was solved by using a tower-like structure base structure in consideration of the shape and the arrangement of reinforcing bars.

  The present invention relates to the improvement of the foundation structure disclosed in Patent Document 5, for example, in the case where the reinforcing bars are overcrowded when constructing the foundation structure according to Patent Document 5, the same effect is obtained. It is desired to simplify the construction by another method that can be expected.

  Therefore, the present invention is a foundation structure in which pre-stress is introduced and concrete is driven using an unbonded anchor, and the construction is simplified to prevent harmful cracks occurring in the concrete, and the falling moment It aims at providing the foundation structure of the tower-like structure which can fully resist.

  As a technical means for achieving the above object, the foundation structure of the tower-like structure according to the present invention is such that the top part extends to a high position in the sky, and the external force acting on the top part and the column base part, In the foundation structure of the tower structure where at least a tipping moment, horizontal force, etc. act, the unbond anchor for fixing the column base part of the tower structure and introducing prestress is in a direction parallel to the unbond anchor. The confining effect is imparted to the outer vertical stripes and the inner vertical stripes that reach the footing portion and the concrete that is driven into the unbond anchors by concentrically placing the unbond anchors between them. It consists of reinforcing members, and concrete foundation is formed by driving concrete into the unbond anchors, vertical bars and reinforcing members. It is characterized by a door.

  In the state where the tower-like structure is supported by the unbonded anchor introduced with the prestress, there is no adhesion between the unbonded anchor and the concrete, so that the load is not transmitted. However, the concrete surrounded by the unbonded anchor bolts and the anchor ring at the lower end where pre-stress is introduced is firmly integrated to transmit the load to the anchor ring. In this case, compressive stress is generated in the vertical direction of the concrete, while tensile stress is generated simultaneously to try to expand the concrete in the horizontal direction intersecting with the compressive stress. Further, as a reaction force to the foundation due to the external force acting on the top, a further vertical compressive stress is added to the compressive stress by the prestress introduction in the compression side concrete portion due to the overturning moment. Similarly, the tensile stress in the horizontal direction is further increased. These tensile stresses are resisted by the confining effect by the reinforcing member. The confining effect is a phenomenon in which the proof stress and toughness are improved when the concrete is axially compressed, and this effect is imparted by the reinforcing member. By providing this confining effect, the expansion of concrete is prevented as much as possible, and the occurrence of cracks is suppressed.

  Moreover, the foundation structure of the tower-shaped structure which concerns on invention of Claim 2 forms the concrete foundation part of the said foundation with the footing part and the base part raised from this footing part, The said reinforcement member is the said base. It consists of a reinforcing plate that covers the outer peripheral surface of the part, and is characterized by imparting a confining effect to the concrete of the pedestal part.

  By covering the outer peripheral surface of the pedestal portion with a reinforcing plate, a confining effect is imparted to the concrete constituting the pedestal portion.

  In addition, the foundation structure of the tower-like structure according to the invention of claim 3 is that the plate material is an iron plate, and the foundation structure of the tower-like structure according to the invention of claim 4 is that the plate material is a reinforcing fiber material. Each is characterized by a certain thing.

  The material of the reinforcing plate is not particularly limited as long as it can exhibit a confining effect, but may be an iron plate or a reinforcing fiber material.

  Moreover, the foundation structure of the tower-shaped structure which concerns on invention of 5th aspect WHEREIN: The said reinforcement member consists of a reinforcement cylinder distribute | arranged in the state which surrounds the said outer vertical reinforcement, The concrete of the part enclosed by this reinforcement cylinder is used. It is characterized by providing a confining effect.

  An iron pipe is used as the reinforcing member, and the reinforcing member is disposed at a position covering the outer vertical bars, and exerts a confining effect on the concrete driven into the inner portion of the outer vertical bars. Unlike the reinforcing plate surrounding the pedestal portion described above, this iron pipe is embedded in the concrete driven into the pedestal portion. For this reason, since it does not depend on the size of the pedestal portion, this structure may be a structure in which the pedestal portion is not particularly formed on the concrete foundation portion, in which case rainwater can be discharged. It is formed on a flat surface or an inclined surface that is inclined as much as possible.

  Moreover, the foundation structure of the tower-like structure which concerns on invention of Claim 6 consists of the PC steel wire distribute | arranged to the state in which the said reinforcing member surrounds the said outer vertical reinforcement, The concrete of the part enclosed by this PC steel wire It is characterized by giving a confining effect.

  A PC steel wire is disposed along the circumference on the outside of the outer vertical bars so as to surround the outer vertical bars. In order to introduce prestress with this PC steel wire, for example, a structure in which one end portion of the PC steel wire is set at a position embedded in the pedestal portion and the other end portion is exposed on the outer peripheral surface of the pedestal portion is used. Is applied to the PC steel wire. In addition, this PC steel wire arrange | positions an appropriate number in a perpendicular direction.

  Moreover, the foundation structure of the tower-shaped structure which concerns on invention of Claim 7 has arrange | positioned the said unbond anchor on the leg lower periphery of the tower-shaped structure which should be supported, It is characterized by the above-mentioned.

  In order to arrange unbond anchors efficiently, the structure is arranged on the circumference centered on the column cross-section center position of the tower-like structure, and a pair of unbond anchors are arranged in parallel in the radial direction of the arc. It is arranged. In this case, it is preferable to arrange the vertical stripes at a position sandwiching the unbonded anchor.

  Moreover, the basic structure of the tower-like structure according to the invention of claim 8 is characterized in that the tower-like structure is a column base for wind power generation.

  The foundation structure according to the present invention is particularly suitable for supporting the column base portion of the wind turbine tower. There are various types of basic structures that support chimneys and various towers, etc., all of which take into account the overturning moment and horizontal force. It is not designed to resist fatigue loads due to. In the foundation structure according to the present invention, by arranging the PC steel wire, it is possible to resist the tensile stress of the concrete foundation portion acting in the direction intersecting with the unbonded anchor. It will be suitable for the basis of.

  According to the basic structure of the tower-like structure according to the present invention, even after the prestress is introduced, the vertical bars arranged against the unbond anchor resist the stress acting on the concrete, and Since the expansion of the concrete is suppressed by the confining effect by the reinforcing member, the cracking of the concrete due to the applied load due to the external force and the fatigue load due to the repetition after the prestress is introduced can be prevented and the breakage can be prevented.

  Moreover, according to the basic structure of the tower-like structure which concerns on invention of Claims 2-4, a reinforcement board can be used as a formwork and a confining effect can be exhibited. In addition, the concrete can be driven in easily. In addition, it can be easily applied to existing foundations.

  Moreover, according to the foundation structure of the tower-shaped structure which concerns on invention of Claim 5, installation of the reinforcement member by an iron pipe is performed simply, construction of a concrete foundation is made simple, and a confinement effect is exhibited by this iron pipe. be able to.

  Moreover, according to the foundation structure of the tower-like structure which concerns on invention of Claim 6, a confinement effect can be exhibited with a PC steel wire.

  Moreover, according to the basic structure of the tower-shaped structure which concerns on invention of Claim 7, it can be made to resist reliably with respect to the load which acts in any direction irrespective of the direction by the external force which acts on a tower-shaped structure. .

  In addition, according to the tower-structure basic structure according to the invention of claim 8, even if a load from a rotating machine or the like is applied, the tower structure is not collapsed, and especially for wind power generation that requires a complicated load. It is suitable to be used for the foundation that supports the column base.

1 is a schematic cross-sectional view of a foundation provided with a structure according to a first embodiment of the present invention. It is sectional drawing cut | disconnected along the AA line in FIG. It is a schematic perspective view of the principal part of the foundation structure which concerns on embodiment shown in FIG. The modification of the basic structure which concerns on 1st Embodiment is shown. It is a schematic sectional drawing of the foundation provided with the structure concerning 2nd Embodiment of this invention. It is sectional drawing cut | disconnected along the AA in FIG. It is a schematic perspective view of the principal part of the basic structure which concerns on embodiment shown in FIG. It is sectional drawing of the outline of the foundation provided with the structure concerning 3rd Embodiment of this invention. It is sectional drawing cut | disconnected along the AA line in FIG. It is a schematic perspective view of the principal part of the foundation structure which concerns on embodiment shown in FIG. It is a schematic perspective view explaining the arrangement | positioning state of the unbonded anchor of the foundation structure which concerns on this invention. It is a figure explaining the outline of distribution of the load which acts on the circumference of the unbond anchor which introduced prestress.

  Hereinafter, the basic structure of the tower-like structure according to the present invention will be specifically described based on the illustrated preferred embodiment. 1 to 3, FIG. 4 to FIG. 4 shows a modification of the first embodiment, FIGS. 5 to 7 show the second embodiment, FIGS. 8 to 10 show the third embodiment, Each is shown.

  The outline of the foundation provided with the structure based on 1st Embodiment of this invention shown in FIG. 1 is shown, and the state which is supporting the tower-like structures 1, such as the column base part for wind power generation, is shown. A foundation 3 is disposed on a pile 2 driven into the ground of the construction site of the tower-like structure 1. In this embodiment, the foundation 3 is formed in a shape including a footing portion 3a and a pedestal portion 3b.

  As shown in FIG. 3, the tower-like structure 1 is fixed to an annular base plate 4 via unbonded anchors 5. As shown in FIGS. 3 and 11, the unbond anchor 5 is stretched over the base plate 4 and the anchor plate 6 so that prestress is introduced. The base plate 4 and the anchor plate 6 are formed in a circular shape as shown in FIGS. 2 and 3, and a pair of unbonded anchors 5 are arranged in the radial direction of the circular shape, and these pairs are arranged on the circumference. Are arranged along. Note that the center of the base plate 4 or the like is substantially coincident with the column cross-sectional center C of the tower-like structure 1. Longitudinal stripes 7 a and 7 b are arranged in parallel with the unbond anchor 5. The lower ends of the vertical bars 7a and 7b reach the footing part 3a of the foundation 3, and are joined to the bar arrangement 3c arranged in the footing part 3a. The vertical bars 7a and 7b are provided with an outer vertical bar 7a on the outer side and an inner vertical bar 7b on the inner side with the anchor bolt 5 in between.

  As shown in FIGS. 1 to 3, the pedestal portion 3 b is formed in a cylindrical shape, and is wound so as to cover the outer peripheral surface with a reinforcing plate 11 as a reinforcing member. As the reinforcing plate 11, an iron plate, a fiber reinforcing material or the like that can be expected to provide a confining effect is used.

  Concrete is driven into the unbonded anchor 5 and the vertical bars 7a and 7b spanned between the base plate 4 and the anchor plate 6 in a state where prestress is introduced to form the footing portion 3a and the pedestal portion 3b. After the concrete is cured, the reinforcing plate 11 covers the outer peripheral surface of the pedestal portion 3b, and the reinforcing plate 11 is fastened to the pedestal portion 3b by an appropriate fastening means. Prior to placing concrete, the reinforcing plate 11 may be disposed as a mold for forming the pedestal portion 3b and the concrete may be driven.

  In the foundation structure configured as described above, for example, the concrete around the unbond anchor 5 into which prestress is introduced in order to fix the wind turbine tower, the longitudinal direction of the unbond anchor 5 as shown by the broken line in FIG. A tensile load acts on the direction intersecting with the longitudinal direction. Although the concrete of the pedestal portion 3b tends to expand due to these tensile loads, the reinforcing plate 11 exerts a confining effect that suppresses the expansion and prevents the expansion. Therefore, the generation of cracks due to the expansion of the concrete is suppressed and the breakage is prevented.

  Also, when a horizontal load received by wind or earthquake acts as a tipping moment, a load similar to the above is applied, and in addition, a horizontal tensile force is applied to the concrete foundation on the compression side due to the tipping moment. . The reinforcing plate 11 resists the horizontal tensile stress generated in the surrounding concrete by the confinement effect, and the occurrence of cracks in the concrete is suppressed as much as possible, and breakage is prevented.

  FIG. 4 shows a modification of the embodiment shown in FIG. 3, and has a structure in which the pedestal 3b is formed in a regular octagon. The shape of the pedestal portion 3b can be formed in a regular polygonal column shape in addition to the cylindrical shape. In this case, each side surface is covered with the reinforcing plate 12. In addition, concrete can be driven by forming a form frame with the reinforcing plate 12 so as to form these regular polygons.

  Next, a second embodiment shown in FIGS. 5 to 7 will be described. In addition, the same code | symbol is attached | subjected about the site | part same as 1st Embodiment shown in FIGS. 1-3.

  In the basic structure according to the second embodiment, a reinforcing cylinder 14 such as an iron pipe is disposed as a reinforcing member at a position surrounding the outer vertical bars 7b of the portion facing the unbond anchor 5. Then, concrete is driven into the unbonded anchor 5 and the longitudinal bars 7a and 7b and the reinforcing cylinder 14 which are stretched over the base plate 4 and the anchor plate 6 with prestress introduced, and the footing portion 3a and the pedestal portion 3b are connected. Form.

  In this second embodiment, when the concrete of the pedestal portion 3b is about to expand due to the tensile load shown by the broken line in FIG. 12, the reinforcing cylinder 14 is confined with respect to the portion of the concrete surrounded by the reinforcing cylinder 14. By exhibiting the effect, the expansion is prevented, the occurrence of cracks in the concrete of this portion is suppressed, and the breakage is prevented.

  Next, a third embodiment shown in FIGS. 8 to 10 will be described. In addition, the same code | symbol is attached | subjected about the site | part same as 1st Embodiment shown in FIGS. 1-3.

  In the third embodiment, a PC steel wire 16 is disposed in the pedestal portion 3b so as to surround the outer vertical bars 7a of the portion facing the unbond anchor 5. One fixing tool 16a of the PC steel wire 16 is disposed at a position facing the outer vertical stripe 7a, and one end portion of a sheath (not shown) through which the PC steel wire 16 is inserted from the fixing tool 16a is disposed. One fixing portion 16a is embedded in the pedestal portion 3b, and the other end portion of the sheath is exposed to the outer peripheral surface of the pedestal portion 3b. For example, as shown in FIG. 9, a part of the pedestal portion 3 b is bulged in the radial direction, a seat surface 17 is formed at an end portion thereof, and the other fixing tool 16 b is disposed on the seat surface 17.

  When constructing a foundation with this structure, concrete is driven into the unbonded anchor 5 and the longitudinal bars 7a and 7b and the PC steel wire 16 which are stretched over the base plate 4 and the anchor plate 6 in a state where prestress is introduced. The footing part 3a and the base part 3b are formed. Then, after the concrete that has been driven in is cured, the PC steel wire 16 is tensioned and fixed by the fixing tool 16b to introduce prestress.

  In the foundation structure according to the third embodiment, when the concrete of the pedestal portion 3b is about to expand due to the tensile load indicated by the broken line in FIG. 12, the PC is compared with the portion of the concrete surrounded by the PC steel wire 16. The steel wire 16 exerts a confining effect to prevent expansion, thereby suppressing the occurrence of cracks in the concrete in this portion and preventing breakage.

  In any of the embodiments described above, so-called fiber concrete in which short fibers such as synthetic fibers and steel fibers are mixed into the concrete to be driven can also be used, and cracks are resisted against the tensile force applied to the concrete. Can be further suppressed.

  In the embodiment described above, the base plate 4 or the like is circular and the unbonded anchor 5 is arranged on the circumference. However, depending on the cross-sectional shape of the tower-like structure 1, other shapes are used. It can also be arranged. In addition, although two / pair unbonded anchors 5 are arranged in the radial direction, three / pairs or more may be arranged.

  Moreover, in any embodiment, although it demonstrated as a basic structure suitable for the tower of wind power generation, it is not restricted to this, As a basic structure of the tower-like structure extended to the high position of the sky like a monument or a chimney It can also be used.

  According to the tower structure according to the present invention, the column base is fixed by using an unbonded anchor introduced with pre-stress, and resists the tensile stress that occurs when the tipping moment is transmitted to the concrete. It becomes a basic structure suitable for a tower for a wind turbine in which a large horizontal load repeatedly acts, can be prevented from collapsing as much as possible, and can contribute to extending the useful life of the tower-like structure.

1 tower-like structure 2 pile 3 foundation
3a Footing part
3b Base 4 Base plate 5 Unbonded anchor 6 Anchor plate
7a, 7b longitudinal bars
11 Reinforcement plate (reinforcement member)
12 Reinforcement plate (reinforcement member)
14 Reinforcing cylinder (reinforcing member)
16 PC steel wire (reinforcing member)
16a Fixing tool
16b Fixing tool
17 Seat

Claims (8)

In the basic structure of the tower-like structure in which the top part extends to a high position in the sky and at least a falling moment and a horizontal force act on the top part and the column base part by an external force,
An unbond anchor for fixing the column base portion of the tower structure, for introducing prestress,
Outer vertical stripes and inner vertical stripes that are parallel to the unbond anchors and arranged concentrically at positions sandwiching the unbond anchors, and reach the footing part,
It consists of a reinforcing member that gives a confining effect to the concrete driven into the unbond anchor,
A foundation structure of a tower-like structure, wherein concrete is formed by driving concrete into the unbond anchors, vertical bars, and reinforcing members. Forming the concrete foundation portion of the foundation with a footing portion and a pedestal portion raised from the footing portion;
The foundation structure of a tower-like structure according to claim 1, wherein the reinforcing member is made of a reinforcing plate that covers an outer peripheral surface of the pedestal portion, and provides a confining effect to the concrete of the pedestal portion.   The base structure of the tower-like structure according to claim 2, wherein the plate material is an iron plate.   The tower structure according to claim 2, wherein the plate material is a reinforcing fiber material.   2. The tower according to claim 1, wherein the reinforcing member includes a reinforcing cylinder arranged in a state of surrounding the outer vertical bars, and provides a confining effect to the concrete surrounded by the reinforcing cylinder. The basic structure of the structure.   The said reinforcement member consists of a PC steel wire arranged in the state surrounding the said outside vertical streak, and gives a confinement effect to the concrete of the part enclosed by this PC steel wire. The basic structure of the tower structure.   The foundation structure of a tower-like structure according to any one of claims 1 to 6, wherein the unbonded anchor is arranged on a circumference below the legs of the tower-like structure to be supported.   The tower structure according to any one of claims 1 to 7, wherein the tower structure is a column base for wind power generation.

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