JP6452349B2 - Bending reinforcement structure of existing tower structure - Google Patents

Description

  The present invention relates to a bending reinforcement structure for an existing tower structure.

  An existing tower structure, a plurality of reinforcing bands (main body fixing bands) that are attached to the existing tower structure at intervals in the vertical direction, and a plurality of rod-shaped members that connect adjacent reinforcing bands to each other A method for reinforcing a tower-like structure is known (see, for example, Patent Document 1).

  In addition, although it is not the reinforcement technique of the existing tower-like structure, patent document 2 is known as a newly built tower-like structure.

JP 2011-153451 A JP 2012-127083 A

  Although the technique disclosed in Patent Document 1 can increase the bending rigidity of the existing tower structure, there is room for improvement in order to increase the bending rigidity of the existing tower structure more efficiently.

  In view of the above facts, an object of the present invention is to efficiently increase the bending rigidity of an existing tower structure.

The bending reinforcement structure of the existing tower-like structure according to the first aspect includes an existing foundation, an existing tower-like structure standing on the existing foundation, and the existing tower-like structure at a plurality of positions spaced in the vertical direction. A reinforcing tensile wire connected to an object and having a lower end fixed to the existing foundation or ground.

According to the bending reinforcement structure of the existing tower-like structure according to the first aspect , the reinforcing tensile wire is connected to the existing tower-like structure at a plurality of positions spaced in the vertical direction, and the lower end portion is the existing foundation. Or fixed to the ground.

  Therefore, when a bending moment acts on the existing tower structure due to the earthquake, the reinforcing tensile wire resists the tensile force acting on the existing tower structure. On the other hand, the resistance force of the reinforcing tensile wire is small against the shearing force acting on the existing tower structure. Therefore, it is possible to increase the bending rigidity while suppressing an increase in the shear rigidity of the existing tower structure.

  Further, the lower end portion of the reinforcing tensile wire is fixed to the existing foundation or the ground. Thereby, the tensile force which acts on the existing tower-like structure is transmitted to the existing foundation or the ground via the reinforcing tensile wire. Therefore, the reinforcing tensile wire can more efficiently resist the tensile force acting on the existing tower structure. Therefore, the bending rigidity of the existing tower-like structure can be efficiently increased.

The bending reinforcement structure of the existing tower structure according to the second aspect is the bending reinforcement structure of the existing tower structure according to the first aspect , comprising a reinforcement frame newly installed around the existing tower structure, A lower end portion of the reinforcing tensile wire is fixed to the existing foundation or the new foundation via the reinforcing frame.

According to the bending reinforcement structure of the existing tower-like structure according to the second aspect , the lower end portion of the reinforcing tensile wire is fixed to the existing foundation or the newly-founded foundation via the reinforcement frame newly provided around the existing tower-like structure. Is done. As a result, when a bending moment acts on the existing tower structure due to the earthquake, the existing foundation separated from the existing tower structure via the tensile wire for reinforcement and the reinforcing frame is applied to the tensile force acting on the existing tower structure. Or it can be communicated to a new foundation.

  Therefore, the reinforcing tensile wire can more efficiently resist the tensile force acting on the existing tower structure. Therefore, the bending rigidity of the existing tower-like structure can be further increased efficiently.

  As described above, according to the bending reinforcement structure for an existing tower structure according to the present invention, the bending rigidity of the existing tower structure can be efficiently increased.

It is an elevation view which shows the existing tower-like structure and the existing foundation to which the bending reinforcement structure of the existing tower-like structure which concerns on 1st Embodiment of this invention was applied. 2A is a cross-sectional view taken along line 2A-2A in FIG. 1, and FIG. 2B is a partially enlarged view of FIG. FIG. 2 is a partially enlarged view of FIG. 1. (A) is an elevation view schematically showing a bending deformation state of an existing tower structure to which the bending reinforcement structure of the existing tower structure according to the comparative example is applied, and (B) is a diagram of the present invention. It is an elevation view which shows typically the bending deformation state of the existing tower-like structure to which the bending reinforcement structure of the existing tower-like structure which concerns on one Embodiment was applied. It is an elevation view which shows the existing tower-like structure and the existing foundation to which the bending reinforcement structure of the existing tower-like structure which concerns on 2nd Embodiment of this invention was applied. FIG. 6 is a sectional view taken along line 6-6 of FIG. It is an elevation view which shows the existing tower-like structure and the existing foundation to which the modification of the bending reinforcement structure of the existing tower-like structure which concerns on 1st Embodiment of this invention was applied.

  Hereinafter, the bending reinforcement structure of the existing tower-like structure which concerns on one Embodiment of this invention is demonstrated, referring drawings.

  First, the first embodiment will be described.

  As shown in FIG. 1, a bending reinforcement structure (hereinafter simply referred to as “bending reinforcement structure”) 10 of an existing tower-like structure according to the first embodiment is erected on an existing foundation 14 and an existing foundation 14. The existing tower-like structure 16 and a plurality of reinforcing tensile wires 20 extending in the vertical direction along the outer surface of the existing tower-like structure 16 are provided.

  The existing foundation 14 is formed by digging the ground 12. Moreover, the existing foundation 14 is formed by reinforced concrete, for example. An existing tower structure 16 is erected on the existing foundation 14.

  The existing tower-like structure 16 is formed in a columnar shape with, for example, reinforced concrete. Moreover, the existing tower-like structure 16 is, for example, a chimney, and is formed in a cylindrical shape having a rectangular cross section as shown in FIG. As shown in FIG. 2B, a reinforcing tensile wire 20 is connected to each corner 16A of the existing tower-like structure 16 via a bracket 24 described later.

  In addition, the existing tower-like structure 16 may be formed by stacking a plurality of precast concrete cylindrical blocks, or may be formed by stacking a plurality of bricks. Moreover, the existing tower-like structure 16 is not limited to a cylindrical shape, and may be a solid tower-like structure.

  As shown in FIGS. 1 and 3, the reinforcing tensile wire 20 is disposed in pairs on both sides of the existing tower-like structure 16. Specifically, the reinforcing tensile wire 20 is disposed along each corner 16 </ b> A of the existing tower-like structure 16. These reinforcing tensile wires 20 are formed by connecting a plurality of tie rods 22 and are arranged from the top 16U of the existing tower-like structure 16 to the legs 16L.

  The tie rod 22 is formed of a rod-shaped member such as a PC steel rod or a reinforcing bar, for example. The adjacent tie rods 22 are connected via a bracket 24 so as to be able to transmit axial force to each other. That is, the reinforcing tensile wire 20 is connected to each corner 16 </ b> A of the existing tower-like structure 16 at a plurality of positions spaced in the vertical direction via the bracket 24.

  As shown in FIG. 2B, the bracket 24 is fixed to the existing tower structure 16 by post-construction. The bracket 24 has a base portion 26 fixed to the existing tower-like structure 16 and an attachment portion 28 to which the tie rod 22 is attached.

  The base part 26 is formed in a cross-sectional L shape by a steel plate or the like. The base portion 26 is arranged in a state where the corner portion 26 </ b> A is aligned with the corner portion 16 </ b> A of the existing tower-like structure 16.

  On the other hand, a post-construction anchor 30 is driven into the corner portion 16 </ b> A of the existing tower-like structure 16, and the base portion 26 is fixed to the post-construction anchor 30 with a nut 32. A gap between the base portion 26 and the corner portion 16A is filled with a filler 34 such as a non-shrink mortar.

  The attachment portion 28 has a pair of holding plates 28A facing each other. The pair of holding plates 28 </ b> A project outward from the corners 26 </ b> A of the base portion 26. An attachment ring 36 attached to an end portion of a tie rod 22 described later is inserted between the pair of holding plates 28A.

  The mounting ring 36 is fixed to the pair of holding plates 28 </ b> A by bolts 38 and nuts 40. Thus, the end portion of the tie rod 22 is attached to the bracket 24 so as to be able to transmit the axial force.

  In addition, the fixing method of the bracket 24 with respect to the existing tower-like structure 16 can be changed suitably. Further, the shape and arrangement of the bracket 24 can be changed as appropriate.

  As shown in FIG. 3, a plurality of brackets 24 are provided at each corner 16 </ b> A of the existing tower-like structure 16 with an interval in the vertical direction. Then, the reinforcing tension wire 20 is formed by stretching the tie rod 22 between the adjacent brackets 24.

  Here, as shown in FIG. 1, the lower end portion 20 </ b> L of the reinforcing tensile wire 20 is embedded in the existing foundation 14 and fixed to the existing foundation 14. Thereby, the tensile force F acting on the reinforcing tensile wire 20 due to the bending moment M is transmitted to the existing foundation 14. An anchor 42 for retaining is provided at the lower end portion 20L of the reinforcing tensile wire 20.

  Next, the operation of the first embodiment will be described.

  As shown in FIG. 1, according to the bending reinforcing structure 10 according to the present embodiment, a pair of reinforcing tensile wires 20 are provided on both sides of the existing tower-like structure 16. Each reinforcing tensile wire 20 extends in the vertical direction along each corner 16A of the existing tower structure 16 and is connected to the existing tower structure 16 via a plurality of brackets 24 spaced in the vertical direction. Has been. Furthermore, the lower end portion 20L of each reinforcing tensile wire 20 is fixed to the existing foundation 14.

  Thereby, when the bending moment M acts on the existing tower-like structure 16 by the earthquake, one reinforcing tensile wire 20 resists the tensile force F acting on the existing tower-like structure 16 by the axial force. Therefore, bending deformation of the existing tower-like structure 16 is suppressed. That is, in this embodiment, the bending rigidity of the existing tower-like structure 16 can be increased by providing the reinforcing tensile wire 20 in the existing tower-like structure 16.

  Here, if the shear rigidity of the existing tower-like structure 16 increases with bending reinforcement of the existing tower-like structure 16, the seismic force input to the existing tower-like structure 16 may increase and become a problem. is there.

  On the other hand, since the reinforcing tensile wire 20 in the present embodiment is a wire extending in the vertical direction, the resistance to the shearing force acting on the existing tower structure 16 is small. Therefore, an increase in the shear rigidity of the existing tower structure 16 is suppressed.

  As described above, in this embodiment, it is possible to increase the bending rigidity of the existing tower structure 16 while suppressing the increase in the shear rigidity of the existing tower structure 16. Therefore, the existing tower-like structure 16 can be efficiently bent and reinforced.

  4A shows an existing tower-like structure 16 to which the bending reinforcement structure 100 according to the comparative example is applied. In the existing tower-like structure 16, each of the pair of reinforcing tensile wires 20 is connected only to the top 16 U of the existing tower-like structure 16 and the existing foundation 14.

  In this case, when the existing tower-like structure 16 is bent and deformed, the intermediate portion 20 </ b> M of one reinforcing tensile wire 20 approaches the existing tower-like structure 16. Therefore, the resistance force of the reinforcing tensile wire 20 to the tensile force F acting on the existing tower structure 16 is reduced.

  On the other hand, FIG. 4B shows an existing tower-like structure 16 to which the bending reinforcement structure 10 according to this embodiment is applied. In the existing tower structure 16, each of the pair of reinforcing tensile wires 20 is connected to the existing tower structure 16 via a plurality of brackets 24 spaced in the vertical direction.

  Thereby, when the existing tower-like structure 16 is bent and deformed, the intermediate portion 20M of one reinforcing tensile wire 20 does not approach the existing tower-like structure 16, and the outer side surface of the existing tower-like structure 16 It is held with a predetermined interval in between.

  Therefore, the reinforcing tensile wire 20 can efficiently resist the tensile force F acting on the existing tower structure 16. Therefore, the bending rigidity of the existing tower-like structure 16 can be increased efficiently.

  Furthermore, in the present embodiment, the lower end portion 20L of the reinforcing tensile wire 20 is fixed to the existing foundation 14. Therefore, the tensile force F acting on the existing tower-like structure 16 is transmitted to the existing foundation 14 via the reinforcing tensile wire 20.

  Thereby, the reinforcing tensile wire 20 can resist the tensile force F acting on the existing tower-like structure 16 more efficiently. Therefore, the bending rigidity of the existing tower structure can be increased efficiently.

  Furthermore, by attaching the reinforcing tensile wire 20 to each corner 16A of the existing tower-like structure 16, the bending rigidity of the existing tower-like structure 16 can be improved in a well-balanced manner. Moreover, since the reinforcing tensile wire 20 can be easily attached to the corner portion 16A of the existing tower-like structure 16, the workability is improved.

  Next, a second embodiment will be described. In addition, the thing of the same structure as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 5, in the bending reinforcing structure 50 according to the second embodiment, the reinforcing tensile wire 20 is fixed to the existing foundation 14 via the reinforcing frame 60.

  Specifically, the reinforcing frame 60 is newly installed around the existing tower structure 16 when the existing tower structure 16 is bent and reinforced. The reinforcing frame 60 is, for example, a three-dimensional frame that surrounds the existing tower structure 16, and the edge of the existing tower structure 16 is cut so that the shear rigidity of the existing tower structure 16 does not increase. Yes.

  Each reinforcing frame 60 has a pair of columns 62 raised from the existing foundation 14 and a truss beam 64 installed on the pair of columns 62. The truss beam 64 includes an upper chord member 64A, a lower chord member 64B, a pair of bundle members 64C, and a plurality of diagonal members 64D.

  The pair of pillars 62 are disposed on both sides of the existing tower-like structure 16 at an interval from the existing tower-like structure 16 in an elevational view (side view). Support. The pair of pillars 62 is raised from the outer periphery of the existing foundation 14.

  The truss beam 64 is formed in a trapezoidal shape in which the upper chord material 64A is shorter than the lower chord material 64B. The upper chord member 64A and the lower chord member 64B are connected by a pair of bundle members 64C and a plurality of diagonal members 64D.

  The pair of bundle members 64C support both ends of the upper chord member 64A in the longitudinal direction on both sides of the existing tower-like structure 16 in an elevational view. The lower end portion 20L of the reinforcing tensile wire 20 is connected to the joint J between the pair of bundle members 64C and the upper chord member 64A.

  As shown in FIG. 6, the column 62 is formed of H-section steel. The column base 62L of the column 62 is disposed to face the corner 16A of the existing foundation 14. A pair of brackets 66 </ b> A and 66 </ b> B extending along the side surface of the existing foundation 14 are provided on the column base 62 </ b> L of the column 62.

  Each bracket 66A, 66B is fixed to the existing foundation 14 by a plurality of post-installed anchors 68 and nuts 69. Further, a filler 70 such as a non-shrink mortar is filled between the brackets 66A and 66B and the existing base 14.

  Next, the operation of the second embodiment will be described.

  As shown in FIG. 5, when a bending moment M acts on the existing tower structure 16 due to an earthquake, a tensile force F is input to the reinforcing tensile wire 20. This tensile force F is transmitted to the existing foundation 14 via the reinforcing frame 60. Therefore, the bending rigidity of the existing tower-like structure 16 can be increased efficiently.

  In addition, the pair of columns 62 in the reinforcing frame 60 are arranged on both sides of the existing tower structure 16 with an interval from the existing tower structure 16 in an elevational view. Thereby, when the bending moment M acts on the existing tower-like structure 16 by the earthquake, the tensile force F acting on the existing tower-like structure 16 is changed to the existing tower shape via the reinforcing tensile wire 20 and the reinforcing frame 60. It is transmitted to the existing foundation 14 away from the structure 16.

  Therefore, the reinforcing tensile wire 20 can more efficiently resist the tensile force F acting on the existing tower-like structure 16. Therefore, the bending rigidity of the existing tower-like structure 16 can be further increased efficiently.

  Furthermore, when the reinforcement frame 60 is newly installed, the existing tower structure 16 is more efficiently adjusted by appropriately adjusting the interval (stance) S between the pair of columns 62 according to the bending rigidity required for the existing tower structure 16. Can be bent and reinforced.

  In addition, although the example which fixes the column base part 62L of the pillar 62 to the existing foundation 14 was shown in FIG. 5, it is not restricted to this. For example, a foundation may be newly installed around the existing foundation 14, and the column base 62L of the column 62 may be fixed to the newly installed foundation. Further, the shape, arrangement, structure, and the like of the reinforcing frame 60 can be changed as appropriate.

  Next, modified examples of the first and second embodiments will be described. In the following, various modified examples will be described taking the first embodiment as an example, but these modified examples are also applicable to the second embodiment as appropriate.

  In the said 1st Embodiment, although the example which fixed the lower end part 20L of the tension wire 20 for reinforcement to the existing foundation 14 was shown, it is not restricted to this. For example, as shown in FIG. 7, the lower end portion 20L of the reinforcing tensile wire 20 may be directly fixed to the ground 12 using a ground anchor 80 or the like.

  Moreover, in the said 1st Embodiment, although the example which has arrange | positioned the tension | tensile_strength wire 20 for reinforcement over the leg part 16L from the top part 16U of the existing tower-like structure 16 was shown, it does not restrict to this. The reinforcing tensile wire 20 may be disposed, for example, from the intermediate portion of the existing tower-like structure 16 to the leg portion 16L.

  Moreover, in the said 1st Embodiment, although the example which has arrange | positioned the tension | tensile_strength wire 20 for reinforcement along the corner | angular part 16A of the existing tower-like structure 16 was shown, it is not restricted to this. The arrangement and number of reinforcing tensile wires 20 can be changed as appropriate.

  Moreover, in the said 1st Embodiment, although the example which formed the tension | tensile_strength wire 20 for reinforcement by connecting the some tie rod 22 was shown, it does not restrict to this. For example, the reinforcing tensile wire may be formed by a single tie rod. The reinforcing tensile wire may be, for example, a PC steel wire or a wire rope.

  Moreover, in the said 1st Embodiment, although the example which has arrange | positioned the tension wire 20 for reinforcement on the outer side of the cylindrical existing tower-like structure 16 was shown, the tension wire for reinforcement is the cylindrical existing tower-like structure 16. You may arrange inside.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

DESCRIPTION OF SYMBOLS 10 Bending reinforcement structure of existing tower structure 12 Ground 14 Existing foundation 16 Existing tower structure 20 Reinforcing tensile wire 20L Lower end part 50 Bending reinforcement structure reinforcement structure of existing tower structure 60 Reinforcement frame

Claims (2)

With existing foundations,
An existing tower-like structure erected on the existing foundation;
A plurality of brackets provided in the existing tower-like structure at intervals in the vertical direction,
A plurality of first bar-like members that are respectively stretched between the adjacent brackets , and a second bar-like member that extends downward from the lowermost bracket and is fixed to the existing foundation or ground. A tensile wire,
Bending reinforcement structure of existing tower-like structure comprising With existing foundations,
An existing tower-like structure erected on the existing foundation;
Reinforced tensile wire that is connected to the existing tower-like structure at a plurality of positions spaced in the vertical direction and whose lower end is fixed to the existing foundation or ground,
A reinforcing frame newly installed around the existing tower-like structure;
With
The lower end portion of the reinforcing tensile wire is fixed to the existing foundation or the new foundation via the reinforcing frame.
Bending reinforcing structure existing tower-like structure.

Images