JP2011236651A - Reinforcement structure for tower structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the flexural capacity of a joint part between a tower structure supported by a foundation and the foundation.SOLUTION: Tension members 14A, 14B, to which tensioning forces are applied, are helically arranged on reinforcement members 12A, 12B that surround a tower structure 22 in such a way as to be in contact with the outside surface of the tower structure 22. The tensioning forces applied to the tension members 14A, 14B are transmitted to a foundation 20 through transmitting parts 16A, 16B, and the reinforcement members 12A, 12B are fixed to the foundation 20. Therefore, compressive stress occurred in a joint part 42 can increase the flexural capacity of the joint part 42 of the tower structure 22.

Description

  The present invention relates to a reinforcing structure for a tower-like structure that reinforces an existing tower-like structure.

As shown in FIG. 17, the columnar structure 500 of Patent Document 1 is constructed by configuring a peripheral wall by combining concrete panels 502 in the circumferential direction and the vertical direction.
When a tower-like structure having a large tower-like ratio (= structure height / structure width) such as the columnar structure 500 is supported on the base, the tower-like structure can be used when an earthquake or the like occurs. A large bending moment acts on the joint between the object and the base.
Therefore, as a measure for enhancing the earthquake resistance of the existing tower-like structure or repairing an old tower-like structure, a reinforcing technique for improving the bending strength of the joint is required.

JP 2008-101363 A

  In consideration of such facts, the present invention has an object to provide a reinforcing structure for a tower-like structure capable of improving the bending strength of the joint between the tower-like structure supported on the foundation and the foundation. .

  The invention according to claim 1 is a reinforcing structure for a tower-like structure that reinforces an existing tower-like structure supported on a base, and a reinforcing member that surrounds and contacts an outer surface of the tower-like structure; A tension member provided spirally on the member and provided with a tension force; and a transmission unit configured to transmit the tension force applied to the tension member to the base and fix the reinforcing member to the base.

In the invention described in claim 1, the reinforcing member surrounds the outer surface of the tower-like structure so as to be in contact with the outer surface of the tower-like structure. And the tension | tensile_strength force provided to the tension | tensile_strength member helically provided in the reinforcement member is transmitted to a base | substrate by a transmission part.
Therefore, the support force is joined as an external force by the compressive stress generated at the joint between the tower-like structure and the base (hereinafter referred to as “support joint”) when the tension applied to the tension member is transmitted to the base. The bending tensile stress caused by the bending moment acting on the part can be reduced. That is, the bending strength of the support joint can be improved.
Further, the reinforcing member is pressure-bonded to the tower structure by the tension member to which the tension force is applied, and the tower structure and the reinforcing member are integrated, so that the shear strength of the tower structure can be improved. .

According to a second aspect of the present invention, a groove in which the tension member is disposed is formed on the outer surface of the reinforcing member.
In the invention according to claim 2, since the groove in which the tension member is disposed is formed on the outer surface of the reinforcement member, the tension member can be disposed at an appropriate position on the outer surface of the reinforcement member. It is possible to prevent the shift.

The invention according to claim 3 is provided with the tension member that is wound clockwise with respect to the material axis of the tower-like structure and the tension member that is wound counterclockwise with respect to the material axis of the tower-like structure. .
In the invention according to claim 3, since the right-handed tension member and the left-handed tension member try to twist the tower-like structure in the opposite directions, the twist of the tower-like structure can be reduced or eliminated.

  Since this invention set it as the said structure, the bending strength of the junction part of the tower-like structure supported on the base | substrate and a base | substrate can be improved.

It is a perspective view which shows the reinforcement structure of the tower-shaped structure which concerns on the 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is explanatory drawing which shows the reinforcement method of the tower-like structure which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the groove | channel formed in the reinforcement member which concerns on the 1st Embodiment of this invention. It is an enlarged view which shows the fixing method of the tension member which concerns on the 1st Embodiment of this invention. It is an enlarged view which shows the fixing method of the tension member which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the effect | action of the reinforcement structure of the tower-like structure which concerns on the 1st Embodiment of this invention. It is a front view which shows the reinforcement structure of the tower-like structure which concerns on the 2nd Embodiment of this invention. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is a perspective view which shows the modification of the reinforcement structure of the tower-like structure which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the modification of the reinforcement structure of the tower-like structure which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the modification of the reinforcement structure of the tower-like structure which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows the modification of the reinforcement structure of the tower-shaped structure which concerns on embodiment of this invention. It is a perspective view which shows the modification of the reinforcement structure of the tower-shaped structure which concerns on embodiment of this invention. It is a perspective view which shows the modification of the reinforcement structure of the tower-shaped structure which concerns on embodiment of this invention. It is a perspective view which shows the conventional columnar structure.

Embodiments of the present invention will be described with reference to the drawings. In the embodiment of the present invention, an example of reinforcing an existing tower structure formed of reinforced concrete is shown. However, embodiments of the present invention are various tower structures such as concrete, steel, and wooden. Can be applied to the reinforcement of
First, a first embodiment of the present invention will be described. As shown in the perspective view of FIG. 1, FIG. 2 which is AA sectional view of FIG. 1, and the front view of FIG. 3 (c), the reinforcing structure 10 of the tower-like structure of the first embodiment is reinforced. As a base constructed on the ground 18 having panel-like structures 12A and 12B as members, a plurality of PC steel strands 14A and 14B as tension members, and fixing portions 16A and 16B as transmission portions The existing tower-like structure 22 supported on the foundation 20 made of reinforced concrete is reinforced.

The tower-like structure 22 is formed of reinforced concrete and is a cylindrical structure having a shape that tapers upward from the upper surface of the foundation 20.
As shown in FIG. 2, the structures 12A and 12B are substantially formed in a shape obtained by dividing a cylindrical member covering the lower outer peripheral surface of the tower-like structure 22 into left and right parts in plan view, and are formed of reinforced concrete. Has been. The structures 12 </ b> A and 12 </ b> B are arranged around the tower-like structure 22 so that the inner wall faces the lower outer surface of the tower-like structure 22 (encloses the outer surface of the tower-like structure 22). As shown in FIG. 2, in the state of FIG. 1, a gap is formed between the side end surface 24A of the structure 12A and the side end surface 24B of the structure 12B.

  As shown in FIG. 1, spiral grooves 26A and 26B are formed on the outer surfaces of the structures 12A and 12B. Then, wires 14A and 14B are spirally provided in the grooves 26A and 26B from PC steel in a state where tension is applied. The PC steel stranded wire 14 </ b> A is provided clockwise (clockwise) upward with respect to the material axis of the tower-like structure 22, and the PC steel stranded wire 14 </ b> B is provided with respect to the material axis of the tower-like structure 22. It is provided in a left-handed direction (counterclockwise) upward.

As shown in the perspective view of FIG. 4 (a), the depth of the groove 26A is deeper than the sum of the depth of the groove 26B and the diameter of the PC steel wire 14A. Since the PC steel stranded wire 14B is disposed on the outside of the steel plate, as shown in the perspective view of FIG. 4 (b) and the cross-sectional view of FIG. 4 (c), the PC steel stranded wire 14A and the PC steel stranded wire 14B Interference of the stranded wires 14A and 14B can be prevented at the places where the crossing points. For convenience of explanation, the side end surfaces 24A and 24B of the structures 12A and 12B are omitted in FIGS.
In addition, as shown in FIG.4 (c), the PC steel strand 14B may be made to protrude from the outer surface of structure 12A, 12B, and does not need to protrude. If the wire 14B is protruded from the outer surface of the structures 12A and 12B from the PC steel, vortex excitation caused by Karman vortices generated on the leeward side of the structures 12A and 12B can be reduced.

  As shown in FIG.1 and FIG.3 (c), PC steel strand 14A, 14B is the state in which tension | tensile_strength was provided and the foundation 20 by fixing | fixed part 16A, 16B provided in the lower part of the foundation 20 at the lower end part. The upper ends are fixed to the structures 12A and 12B by the fixing portions 28A and 28B provided on the upper portions of the structures 12A and 12B. Thereby, the tension applied to the wires 14 </ b> A and 14 </ b> B from the PC steel is transmitted to the foundation 20 by the fixing portions 16 </ b> A and 16 </ b> B, and the structures 12 </ b> A and 12 </ b> B are fixed to the foundation 20.

  Next, a method for reinforcing a tower structure using the reinforcing structure 10 will be described. 3A to 3C, the existing tower shape supported by the foundation 20 by the reinforcing method of the tower-like structure having the reinforcing member arranging step, the tension member arranging step, the tensioning step, and the reinforcing member fixing step. An example of reinforcing the structure 22 is shown. First, as shown in the front view of FIG. 3A, the structures 12A and 12B are placed on the upper surface of the foundation 20 so that the inner wall surfaces of the structures 12A and 12B are in contact with the outer surface of the tower-like structure 22. The outer surfaces of the tower-like structure 22 are surrounded by the structures 12A and 12B (reinforcing member arranging step).

  Next, as shown in the front view of FIG. 3B, a PC steel wire 14A is spirally provided in the groove 26A formed in the structures 12A and 12B (strain member placement step). Next, the upper and lower ends of the PC steel wire 14A are simultaneously pulled by a tensioning device such as a hydraulic jack, and the lower end of the PC steel wire 14A is applied to the fixing portion 16A in a state where tension is applied to the PC steel wire 14A. It fixes to the foundation 20, and fixes the upper end part of the wire 14A from PC steel to the structures 12A and 12B in the fixing part 28A (tensioning process).

As shown in the enlarged view of FIG. 5, the fixing portion 16 </ b> A fixes the lower end portion of the PC steel strand 14 </ b> A to the foundation 20 on the male screw provided at the lower end portion of the PC steel strand 14 </ b> A. The nut 34 is screwed in and tightened through the anchor plate 32 disposed in the notch 30 formed in.
As shown in the enlarged view of FIG. 6, the fixing of the upper end portion of the PC steel strand 14 </ b> A in the fixing portion 28 </ b> A to the male screw provided at the upper end portion of the PC steel strand 14 </ b> A This is done by screwing and tightening a nut 34 via an anchor plate 32 disposed in a notch 36 formed on the upper surface of the bodies 12A, 12B. As shown in FIG. 6, the upper portions of the structures 12A and 12B are formed on the upper end surfaces of the structures 12A and 12B from the ceiling surface of the notches 38 formed on the upper outer peripheral surfaces of the structures 12A and 12B. A through hole 40 penetrating to the bottom surface of the notch 36 is formed. And the upper end part of 14 A of strands is inserted in this through-hole 40 from PC steel.

Next, as shown in FIG. 3C, the PC steel strand 14B is provided in a spiral shape in the grooves 26B formed in the structures 12A and 12B (tension member placement step). Next, the upper and lower ends of the PC steel wire 14B are simultaneously pulled by a tension device such as a hydraulic jack, and the lower end of the PC steel wire 14B is applied to the fixing portion 16B in a state in which tension is applied to the PC steel wire 14B. It fixes to the foundation 20, and fixes the upper end part of the wire 14B from PC steel to the structures 12A and 12B in the fixing part 28B (tensioning process).
Fixing to the base 20 at the lower end of the PC steel strand 14B in the fixing unit 16B is performed in the same manner as the fixing in the fixing unit 16A described with reference to FIG. Further, fixing to the structures 12A and 12B at the upper end portion of the PC steel strand 14B in the fixing portion 28B is performed by the same method as the fixing in the fixing portion 28A described with reference to FIG.

  And the tension | tensile_strength process performed with respect to wire 14A, 14B from PC steel gives tension | tensile_strength to 14A, 14B from PC steel, and transmits this tension | tensile_strength to the foundation 20. FIG. Thus, the structural bodies 12A and 12B are fixed to the foundation 20 (reinforcing member fixing step).

Next, the operation and effect of the first embodiment of the present invention will be described. In the tower-like structure reinforcing structure 10 and the tower-like structure reinforcing method of the first embodiment, as shown in the cross-sectional view of FIG. 7, PC steel wires 14A and 14B (not shown) are applied. By transmitting the tension force to the foundation 20, a compressive stress is generated at a joint portion between the tower-like structure 22 and the foundation 20 (hereinafter referred to as “support joint portion 42”).
Moreover, since structure 12A, 12B is crimped | bonded to the tower-like structure 22 by 14 A, 14B from PC steel to which tension | tensile_strength was provided (arrow 44), tension | tensile_strength provided to 14A, 14B from PC steel Can be effectively transmitted to the foundation 20 via the structures 12A and 12B and the tower-like structure 22.
Accordingly, the bending tensile stress P generated due to the bending moment M acting on the support joint 42 as an external force due to the compressive stress generated in the support joint 42 can be reduced. That is, the bending strength of the support joint 42 can be improved.

In addition, since the structures 12A and 12B are crimped to the tower-like structure 22 by the wires 14A and 14B from the PC steel to which tension is applied, the tower-like structure 22 and the structures 12A and 12B are integrated. The shear strength of the tower-like structure 22 can be improved.
Moreover, as shown in FIG. 1, since the PC steel strands 14A and 14B are provided in the grooves 26A and 26B formed on the outer surfaces of the structures 12A and 12B, the appropriate outer surfaces of the structures 12A and 12B are provided. The PC steel wires 14A and 14B can be arranged at the positions, and the wires 14A and 14B can be prevented from being displaced from the arranged PC steel.

  Further, the PC steel stranded wire 14A provided in a clockwise direction (clockwise) upward with respect to the material axis of the tower-like structure 22 and the left-hand direction upward with respect to the material axis of the tower-like structure 22 Since the PC steel strand 14B provided in the (counterclockwise) direction tries to twist the tower-like structure 22 in the opposite direction to the material axis of the tower-like structure 22, the PC steel strands 14A, 14B It is possible to reduce or eliminate the twist of the tower-like structure 22 that occurs when a tension force is applied to one of the two.

  Further, since the structures 12A and 12B are crimped to the tower structure 22 by the wires 14A and 14B from the PC steel to which tension is applied, the structure is formed on the outer surface of the tower structure 22 without using an adhesive or the like. 12A and 12B can be fixed. In this case, the outer surface of the tower-like structure 22 can be obtained by filling a filler such as grout between the outer surface of the tower-like structure 22 and the inner wall surfaces of the structures 12A and 12B or by sandwiching an elastic body. The degree of adhesion of the inner wall surfaces of the structures 12A and 12B can be increased.

Moreover, since the tower-like structure 22 is formed of concrete, prestress is introduced in the material axis direction of the tower-like structure 22 by the PC steel wires 14A and 14B to which tension is applied. Thereby, the tensile stress which acts on the axial direction of the tower-like structure 22 is reduced. Therefore, the crack resistance and tensile strength of the tower-like structure 22 can be improved as compared with a configuration in which prestress is not introduced in the material axis direction of the tower-like structure 22.
Further, prestress is introduced in the circumferential direction of the tower-like structure 22 by the PC steel wires 14A and 14B to which tension is applied. Thereby, the tower-like structure 22 is restrained in the circumferential direction and a confining effect is exhibited. Therefore, the compressive yield strength of the tower-like structure 22 can be improved as compared with the configuration in which prestress is not introduced in the circumferential direction of the tower-like structure 22.
The bending tensile stress generated in the tower-like structure 22 due to the bending moment acting on the tower-like structure 22 is reduced by the prestress in the material axis direction introduced into the tower-like structure 22. The bending compressive stress generated in the tower-like structure 22 due to the bending moment acting on the tower-like structure 22 is reduced by the circumferential prestress introduced into the object 22, so that the bending of the tower-like structure 22 is reduced. Yield can be improved.

The first embodiment of the present invention has been described above.
In the first embodiment, the example in which the reinforcing members are the structural bodies 12A and 12B that are almost similar to the shape obtained by dividing the cylindrical member into the left and right parts in a plan view is shown. Any member that can surround and touch the outer surface of the structure 22 can be used. Further, a plurality of reinforcing members may be stacked up and down, or three or more reinforcing members may surround the outer surface of the tower-like structure 22, or in the circumferential direction of the tower-like structure 22. Reinforcing members may be interspersed.
If the outer surface of the tower-like structure 22 is surrounded by a large number of reinforcing members, the size and weight of the reinforcing members can be reduced, and the complexity of carrying and installing the reinforcing members can be reduced. it can. Moreover, since it becomes possible to surround the outer surface of various tower-like structures with different structural cross-sectional sizes, it is possible to standardize the reinforcing member.

In the first embodiment, the example in which the reinforcing members (structures 12 </ b> A and 12 </ b> B) are arranged on the outer surface of the lower portion of the tower-like structure 22 has been described. For example, a reinforcing member may be arranged over the entire outer surface of the tower-like structure 22 like a tower-like structure reinforcing structure 74 (see FIG. 11) described later. May be. If it does in this way, the bending proof stress of the tower-like structure 22 whole surrounded by the reinforcement member can be improved.
Moreover, although the example which formed the reinforcing member (structure 12A, 12B) with the reinforced concrete was shown, the reinforcing member can improve the shear strength of the tower-like structure 22 by uniting with the tower-like structure 22. For example, it may be formed of high-strength concrete, fiber-reinforced concrete, steel, or resin.

  In the first embodiment, the PC steel wires 14A and 14B are provided on the outer surfaces (outside) of the structures 12A and 12B. However, the number and arrangement of the PC steel wires 14A and 14B are appropriately set. Just decide. Also, PC steel strands 14A and 14B may be provided inside the structures 12A and 12B.

Moreover, in 1st Embodiment, although the tension | tensile_strength member showed the wire 14A, 14B from PC steel, the tension member should just be a linear member which can provide tension | tensile_strength reliably. It is preferable to use a PC steel material such as a PC steel strand or a PC steel wire as the tension member.
Moreover, although the upper and lower ends of the wires 14A and 14B were simultaneously pulled from the PC steel and tension was applied to the wires 14A and 14B from the PC steel, the lower ends of the wires 14A and 14B from the PC steel were anchor plates. 32 and a nut 34 to be fixed to the foundation 20, and the upper ends of the PC steel wires 14A and 14B may be pulled to apply tension to the PC steel wires 14A and 14B. The upper end portion of 14B is fixed to the structures 12A and 12B by the anchor plate 32 and the nut 34, and the lower end portion of the PC steel wires 14A and 14B is pulled to apply tension to the PC steel wires 14A and 14B. Also good.

In the first embodiment, the example in which the grooves 26A and 26B formed on the outer surfaces of the structures 12A and 12B are spiral is shown, but any spiral shape may be used. The ratio of prestress introduced into the material axis direction and the circumferential direction of the tower-like structure 22 is determined by the inclination of the spiral shape.
Moreover, as shown in FIG.3 (c), PC steel strands 14A and 14B arrange | positioned in the foundation 20 are the joining surfaces (henceforth "joining surface 46") of the foundation 20 and the tower-like structure 22. As shown in FIG. ) May be disposed obliquely with respect to the joint surface 46, or may be disposed in a spiral shape with a perpendicular to the joint surface 46 as a pivot axis.

  Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and are appropriately omitted. As shown in the front view of FIG. 8, in the tower-like structural member reinforcing structure 48 of the second embodiment, block bodies 50A to 50D as transmission members are placed on the upper surfaces of the structural bodies 12A and 12B. As shown in FIG. 9 which is a BB sectional view of FIG. 8, the block bodies 50 </ b> A to 50 </ b> D have a substantially circular arc shape obtained by dividing a cylindrical member into four parts in plan view, and are formed of reinforced concrete. Yes.

The block bodies 50 </ b> A to 50 </ b> D are arranged around the tower-like structure 22 so that the inner wall faces the outer surface of the tower-like structure 22. That is, the block bodies 50 </ b> A to 50 </ b> D surround the outer surface of the tower structure 22 so as to be in contact with the outer surface of the tower structure 22.
As shown in FIG. 9, with the block bodies 50A to 50D surrounding the outer surface of the tower-like structure 22, the side end face 52A of the block body 50A, the side end face 52B of the block body 50B, and the side end face 52B of the block body 50B A gap is formed between the side end face 52C of the block body 50C, the side end face 52C of the block body 50C, the side end face 52D of the block body 50D, and the side end face 52D of the block body 50D and the side end face 52A of the block body 50A. Yes.

Both ends of steel rods 62 that pass through substantially horizontal through holes 58 and 60 formed in the tower-like structure 22 for repair are fixed to the block bodies 50A and 50C by nuts 56 via anchor plates 54. ing. Both ends of steel rods 68 passing through substantially horizontal through holes 64 and 66 formed in the tower-like structure 22 for repair are fixed to the block bodies 50B and 50D by nuts 56 via the anchor plates 54. ing.
The steel rod 62 and the steel rod 68 have a circular cross section and are substantially orthogonal in a plan view. Further, as shown in FIG. 10, which is a CC cross-sectional view of FIG. 9, the steel bar 68 is disposed below the steel bar 62.

  As shown in FIG. 8, spiral grooves 70A and 70B are formed on the outer surfaces of the block bodies 50A to 50D, respectively. The grooves 70A and 70B and the grooves 26A and 26B of the structures 12A and 12B are connected in a state where the block bodies 50A to 50D surround the outer surface of the tower-like structure 22. The grooves 70A and 70B are formed to a depth that can prevent the interference of the wires 14A and 14B from the PC steel where the PC steel strand 14A and the PC steel strand 14B intersect, like the grooves 26A and 26B. Has been.

  The PC steel stranded wires 14A and 14B are fixed to the base 20 at the fixing portions 16A and 16B provided at the lower portion of the foundation 20 with the tension applied, and the upper ends of the block bodies 50A to 50D. It is fixed to the block bodies 50A to 50D at fixing portions 72A and 72B provided at the upper part. The fixing mechanism of the fixing units 72A and 72B is the same as the fixing mechanism of the fixing units 28A and 28B provided on the upper portions of the structures 12A and 12B.

  Next, the operation and effect of the second embodiment of the present invention will be described. In the tower-like structure reinforcing structure 48 of the second embodiment, substantially the same effect as that of the tower-like structure reinforcing structure 10 of the first embodiment can be obtained.

Moreover, by installing the block bodies 50A to 50D on the upper surfaces of the structures 12A and 12B, the vertical components of the tension applied to the PC steel strands 14A and 14B are converted into the block bodies 50A to 50D and the steel rods 62 and 68, respectively. , And can be effectively transmitted to the foundation 20 via the tower-like structure 22.
That is, in the tower-like structure reinforcing structure 10 according to the first embodiment, the tower-like structures 22A and 12B are tower-like due to the frictional force between the outer surface of the tower-like structure 22 and the inner wall surfaces of the structures 12A and 12B. While the vertical component of the tension applied to the wires 22A and 14B from the PC steel is transmitted to the structure 22, the tower-like structure reinforcement structure 48 of the second embodiment has this transmission mechanism. In addition, since the vertical component of the tension applied to the wires 14A and 14B from the PC steel is directly applied to the tower-like structure 22 from the steel bars 62 and 68, the wires are applied to the wires 14A and 14B from the PC steel. The vertical component of tension can be effectively transmitted to the foundation 20.

The second embodiment of the present invention has been described above.
In the second embodiment, the vertical component of tension applied to the wires 14A and 14B from the PC steel is transferred to the tower structure 22 by the two steel rods 62 and 68 penetrating the tower structure 22. Although an example of adding is shown, when it is desired to further increase the force transmission efficiency, the number of steel bars 62 and 68 may be increased or a prismatic shape may be used. When increasing the number of the steel bars 62 and 68, it is necessary to fully consider the strength reduction of the tower-like structure 22 due to the cross-sectional defect.

Moreover, in 2nd Embodiment, although the block bodies 50A-50D as a transmission member showed the example mounted in the upper surface of structure 12A, 12B, the tower-like structure shown to the perspective view of FIG. As shown in the reinforcing structure 74, a transmission member may be placed on the top upper surface 82 of the tower-like structure 22.
As shown in FIG. 11, in the reinforcing structure 74, the structures 12A and 12B are placed on the upper surface of the foundation 20, and the structures 12C and 12D are placed on the upper surfaces of the structures 12A and 12B. , 12F are placed on the upper surfaces of the structures 12C, 12D. The structural bodies 12C to 12F have the same configuration as the structural bodies 12A and 12B, are substantially in the shape of a cylindrical member divided into two equal parts in a plan view, and are formed of reinforced concrete.

  The structures 12A to 12F are arranged around the tower-like structure 22 so that the inner wall faces the outer surface of the tower-like structure 22 (surrounds the outer surface of the tower-like structure 22). Further, a gap is formed between the side end surfaces of the opposing structures 12A to 12F. Thus, the entire outer surface of the tower-like structure 22 is covered with the structures 12A to 12F.

Spiral grooves 26A and 26B are formed on the outer surfaces of the structures 12A to 12F to form the spiral grooves 76A and 76B in a state where the structures 12A to 12F surround the outer surface of the tower structure 22, respectively. Yes. A PC steel strand 14A is disposed in the groove 76A, and a PC steel strand 14B is disposed in the groove 76B. In this way, the PC steel strands 14A and 14B are spirally provided on the structures 12A to 12F in a state where tension is applied.
The PC steel stranded wire 14 </ b> A is provided clockwise (clockwise) upward with respect to the material axis of the tower-like structure 22, and the PC steel stranded wire 14 </ b> B is provided with respect to the material axis of the tower-like structure 22. It is provided in a left-handed direction (counterclockwise) upward.

  As described in FIG. 4 of the first embodiment, the grooves 26A and 26B prevent the interference of the PC steel strands 14A and 14B at the place where the PC steel strand 14A and the PC steel strand 14B intersect. It is formed to the depth that can be. The PC steel stranded wire 14B may or may not protrude from the outer surfaces of the structures 12A to 12F. If the wire 14B is projected from the outer surface of the structures 12A to 12F from the PC steel, vortex excitation caused by Karman vortices generated on the leeward side of the structures 12A to 12F can be reduced.

As shown in FIG. 12 and FIG. 13 which is a cross-sectional view in which the vicinity of the top of the tower-like structure 22 is divided vertically, the upper surfaces 78 and 80 of the structures 12E and 12F, and the top upper surface 82 of the tower-like structure 22 Are flush and form a horizontal plane. And the annular block body 84 as a transmission member is mounted in the upper surfaces 78 and 80 of the structures 12E and 12F, and the top upper surface 82 of the tower-like structure 22. As shown in FIG. That is, the lower surface of the block body 84 is in contact with both the upper surfaces 78 and 80 of the structures 12E and 12F and the top upper surface 82 of the tower structure 22. The block body 84 is formed of reinforced concrete.
In addition, the upper surfaces 78 and 80 of the structures 12E and 12F may not be in contact with the lower surface of the block body 84. For example, a gap may be formed between the upper surfaces 78 and 80 of the structures 12E and 12F and the lower surface of the block body 84, or the upper surfaces 78 and 80 of the structures 12E and 12F and the lower surface of the block body 84 may be formed. And may be far apart.
Since the grooves formed on the outer surface of the block body 84 and the configuration of the fixing unit provided on the upper portion of the block body 84 are the same as those of the block bodies 50A to 50D, the same reference numerals are given and description thereof is omitted.

The PC steel stranded wires 14A and 14B are fixed to the base 20 by fixing portions 16A and 16B provided at the lower portion of the foundation 20 in a state in which tension is applied, and the upper ends are attached to the upper portion of the block body 84. The fixing unit 72A, 72B provided is fixed on the block body 84.
Therefore, in the tower-like structure reinforcing structure 74, the PC steel is transferred from the structures 12A to 12F to the tower-like structure 22 by the frictional force between the outer surface of the tower-like structure 22 and the inner wall surfaces of the structures 12A to 12F. The vertical component of tension applied to the stranded wires 14A and 14B is transmitted, and the vertical component of tension applied to the wires 14A and 14B from the PC steel is added to the tower structure 22 directly from the block body 84. Therefore, the vertical component of tension applied to the wires 14 </ b> A and 14 </ b> B from the PC steel can be effectively transmitted to the foundation 20.

The first and second embodiments of the present invention have been described above.
In the first and second embodiments, an example in which the structure to be reinforced is the tower-like structure 22 supported on the foundation 20 has been shown. However, the tower-like structure of the first and second embodiments is shown. The structural reinforcement structures 10, 48, and 74 can be applied to tower structures of various uses and scales. For example, the reinforcing structures 10, 48, and 74 can be applied to tower-like structures such as a tower for wind power generation, a chimney, a transmission line tower, an airfield control tower, a television tower, and a tower-like building.
Moreover, although the example which used the foundation as the foundation 20 was shown, it is not restricted to this, For example, the structure is supported on the sea bottom through a structure, the rooftop of a building, a pile, or a structure placed on the ocean, or It is good also as a structure which floats and is arrange | positioned. Moreover, you may make it fix a tension | tensile_strength member to a ground with an anchor | base using a base as a ground.

In the first embodiment, the upper ends of the stranded wires 14A and 14B of the PC steel are fixed to the structures 12A and 12B by the fixing portions 28A and 28B provided at the upper portions of the structures 12A and 12B. In the embodiment, the upper end portions of the PC steel wires 14A and 14B are fixed to the block bodies 50A to 50D and 84 by the fixing portions 72A and 72B provided on the upper portions of the block bodies 50A to 50D and 84, respectively. The PC steel strand may be wound around the upper parts of the structures 12A and 12B and the upper parts of the block bodies 50A to 50D and 84.
For example, as shown in the perspective view of FIG. 14, the PC steel stranded wires 14A and 14B are replaced with one PC steel stranded wire 86, and the PC steel stranded wire 88 is formed in an annular groove 88 formed in the upper part of the structures 12A and 12B. The wire 86 may be fixed to the structures 12A and 12B by winding the wire 86. FIG. 14 shows a fixing method for the structural bodies 12A and 12B, but the same fixing method may be used for the block bodies 50A to 50D and 84 as well.

Further, in the first embodiment, an example in which the PC steel strands 14A and 14B whose turning directions are opposite to each other is provided on the structures 12A and 12B, but as shown in the perspective view of FIG. The structure bodies 12A and 12B are divided into two layers, and the PC steel stranded wire 14A is inserted into a groove 26A formed on the outer surface of the structures 12A and 12B (hereinafter referred to as “structure bodies 90A and 90B”) disposed inside. A PC steel wire 14B may be provided in a spiral shape in a groove 26B formed on the outer surface of the structures 12A and 12B (hereinafter referred to as “structures 92A and 92B”) provided in a spiral shape. .
In the perspective view of FIG. 15 (a), the PC steel stranded wire in which the outer surface of the tower-like structure 22 is surrounded by the structures 90A and 90B so as to be in contact with the outer surface of the tower-like structure 22, and tension is applied. A state in which 14A is spirally provided on the structures 90A and 90B is shown. Further, in the perspective view of FIG. 15B, the PC steel to which tension is applied by surrounding the outer surfaces of the structures 90A and 90B with the structures 92A and 92B so as to contact the outer surfaces of the structures 90A and 90B. The state where the stranded wire 14B is spirally provided on the structures 92A and 92B is shown.
The examples shown in FIGS. 15A and 15B can also be applied to the reinforcing structures 48 and 74 of the tower-like structure shown in FIGS.

  In the first and second embodiments, an example in which the shape of the tower-like structure 22 is cylindrical has been shown, but the cross-section of the tower-like structure to be reinforced may have any shape. For example, the cross section of the tower-like structure may be a circle, an ellipse, a triangle, a square, a rectangle, or a polygon. Further, the shape of the tower-like structure may be a cone shape. An example of a cylindrical tower-like structure 94 having a circular structural section is shown in the perspective view of FIG. 16A, and a cylinder having a regular hexagonal structural section is shown in the perspective view of FIG. An example of a cylindrical tower-like structure 96 is shown, and in the perspective view of FIG. 16C, an example of a cylindrical tower-like structure 98 having a regular octagonal cross section is shown.

Further, in the first and second embodiments, the nut 34 is screwed into the male screw provided at the end of the PC steel stranded wires 14A and 14B via the anchor plate 32 and tightened, so that the PC steel Although an example in which the ends of the wires 14A and 14B are fixed is shown, the ends of the wires 14A and 14B may be fixed from PC steel by other methods such as a fixing method using a wedge.
In addition, the term “spiral” used in the description of the first and second embodiments means a spiral space curve formed when moving at a constant speed in the axial direction while rotating on a cylindrical surface. However, spiral spiral lines are also included in the spiral, which are formed when the rod advances on the prismatic surface, the conical surface, and the pyramid surface while traveling at a constant speed in the axial direction. Further, the helical twist of the stranded wires 14A and 14B of the PC steel may be less than 360 degrees in plan view.

  As mentioned above, although 1st and 2nd embodiment of this invention was described, this invention is not limited to such embodiment at all, You may use combining 1st and 2nd embodiment, Needless to say, the present invention can be implemented in various modes without departing from the gist of the present invention.

10, 48, 74 Tower-like structure reinforcing structures 12A-12F, 90A, 90B, 92A, 92B Structure (reinforcing member)
14A, 14B, 86 PC steel strand (tension member)
16A, 16B Fixing part (transmission part)
20 Foundation
22, 94, 96, 98 Tower-like structure 26A, 26B, 76A, 76B Groove

Claims (3)

In the reinforcing structure of the tower-like structure that reinforces the existing tower-like structure supported on the base,
A reinforcing member that surrounds and contacts the outer surface of the tower-like structure;
A tension member spirally provided on the reinforcing member and provided with a tension force;
A transmission unit for transmitting the tension applied to the tension member to the base and fixing the reinforcing member to the base;
A reinforcing structure of a tower-like structure having   The reinforcing structure for a tower-like structure according to claim 1, wherein a groove in which the tension member is disposed is formed on an outer surface of the reinforcing member.   The tower according to claim 1, wherein the tension member that is wound clockwise with respect to the material axis of the tower-like structure and the tension member that is wound counterclockwise with respect to the material axis of the tower-like structure are provided. Reinforcement structure of a shaped structure.

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