JP7062853B2 - Seismic retrofitting structure - Google Patents

Description

The present invention relates to a seismic retrofitting structure.

Reinforcing beams made of reinforced concrete, which are constructed along existing beams made of reinforced concrete and reinforce the existing beams, are known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 10-131516

By the way, there is a structure in which existing concrete walls are provided in a plurality of existing frames that are continuous in the vertical direction and the horizontal direction. When reinforcing such a structure, for example, it is conceivable to additionally reinforce a plurality of existing concrete walls.

However, it takes time and effort to reinforce a plurality of existing concrete walls.

In consideration of the above facts, an object of the present invention is to improve the proof stress of a plurality of existing concrete walls while improving the workability.

The seismic reinforcement structure according to the first aspect includes a plurality of existing frames in which existing concrete walls are provided in the frame, and the existing frame at the uppermost end of the plurality of existing frames, which are continuous in the vertical direction. It is provided on the upper existing beam to be configured, and is provided with a beam reinforcing portion that enhances the binding force of the existing concrete wall by the upper existing beam.

According to the seismic retrofitting structure according to the first aspect , the plurality of existing frames are continuous in the vertical direction, and existing concrete walls are provided in each of the frames. Further, among a plurality of existing frames continuous in the vertical direction, a beam reinforcing portion is provided on the upper existing beam constituting the existing frame at the uppermost end. This beam reinforcing portion enhances the binding force of the existing concrete wall by the upper existing beam.

Here, when the binding force of the existing concrete wall by the upper existing beam is low, the resistance of the upper existing beam to the shear deformation (rotational deformation) of the existing concrete wall at the time of an earthquake becomes small, and the existing concrete wall fully exerts its proof stress. You may not be able to.

On the other hand, in the present invention, as described above, the beam reinforcing portion is provided on the upper existing beam. This beam reinforcing portion enhances the binding force of the existing concrete wall by the upper existing beam. As a result, in the event of an earthquake, the existing concrete wall can fully exert its bearing capacity, so that the bearing capacity of the existing concrete wall is enhanced. In other words, the bearing capacity of the existing concrete wall can be highly evaluated by increasing the binding force of the existing concrete wall by the upper existing beam.

In addition, among a plurality of existing frames that are continuous in the vertical direction, by providing a beam reinforcing portion on the upper existing beam that constitutes the existing frame at the uppermost end, all the existing concrete walls that are continuous below the upper existing beam are restrained. Power is enhanced. As a result, the bearing capacity of all existing concrete walls continuous below the upper existing beam is enhanced.

As described above, in the present invention, the bearing capacity of a plurality of existing concrete walls can be increased without reinforcing each of the plurality of existing concrete walls. Therefore, in the present invention, it is possible to increase the proof stress of a plurality of existing concrete walls while improving the workability.

The seismic reinforcement structure according to the second aspect is located at both ends of a plurality of existing frames having existing concrete walls in the frame and a plurality of horizontally continuous frames, which are continuous in the horizontal direction. Each of the outer existing columns constituting the existing frame is provided with a column reinforcing portion for increasing the binding force of the existing concrete wall by the outer existing columns.

According to the seismic retrofitting structure according to the second aspect , the plurality of existing frames are continuous in the horizontal direction, and existing concrete walls are provided in the frames. Further, pillar reinforcing portions are provided at both ends of a plurality of existing frames that are continuous in the horizontal direction, and the outer existing columns constituting the existing frame are provided with column reinforcing portions. These column reinforcements enhance the binding force of the existing concrete wall by the existing outer columns.

Here, when the binding force of the existing concrete wall by the existing columns is low, the resistance of the existing frame to the shear deformation (rotational deformation) of the existing concrete wall at the time of an earthquake becomes small, and the existing concrete wall fully exerts its bearing capacity. May not be possible.

On the other hand, in the present invention, as described above, a column reinforcing portion is provided on the existing outer column. This column reinforcement enhances the binding force of the existing concrete wall by the existing outer column. As a result, in the event of an earthquake, the existing concrete wall can fully exert its bearing capacity, so that the bearing capacity of the existing concrete wall is enhanced. In other words, the bearing capacity of the existing concrete wall can be highly evaluated by increasing the binding force of the existing concrete wall by the existing pillar.

In addition, by providing column reinforcements on the outer existing columns that are located at both ends of a plurality of existing structures that are continuous in the horizontal direction and that constitute the existing frame, all existing concrete walls between the outer existing columns at both ends are restrained. Power is enhanced. As a result, the bearing capacity of all existing concrete walls between the outer existing columns at both ends is increased.

As described above, in the present invention, the bearing capacity of a plurality of existing concrete walls can be increased without reinforcing each of the plurality of existing concrete walls. Therefore, in the present invention, it is possible to increase the proof stress of a plurality of existing concrete walls while improving the workability.

The seismic retrofitting structure according to the third aspect is the seismic retrofitting structure according to the first aspect or the second aspect , and the plurality of existing structures are continuous in the horizontal direction and the vertical direction.

According to the seismic retrofitting structure according to the third aspect , the plurality of existing frames are continuous in the horizontal direction and the vertical direction. Thereby, in the present invention, it is possible to efficiently increase the proof stress of the existing concrete wall provided in each of the plurality of existing frames which are continuous in the vertical direction and the horizontal direction.

As described above, according to the seismic retrofitting structure according to the present invention, it is possible to improve the proof stress of a plurality of existing concrete walls while improving the workability.

It is an elevation view which shows the structure to which the seismic retrofitting structure which concerns on 1st Embodiment is applied. (A) is a cross-sectional view corresponding to the 2-2 line cross-sectional view of FIG. 1 showing an existing frame before the seismic retrofitting structure according to the first embodiment is applied, and (B) is a cross-sectional view corresponding to the first embodiment. It is a cross-sectional view taken along line 2-2 of FIG. 1 showing an existing frame to which the seismic retrofitting structure according to the above is applied. It is an elevation view which shows the structure to which the seismic retrofitting structure which concerns on 2nd Embodiment is applied. (A) is a cross-sectional view corresponding to FIG. 2 (A) showing an existing frame before the modification of the seismic retrofitting structure according to the first embodiment is applied, and (B) is a cross-sectional view according to the first embodiment. It is sectional drawing corresponding to FIG. 2 (B) which shows the existing frame to which the modification of the seismic retrofitting structure is applied. (A) is a cross-sectional view corresponding to FIG. 2 (A) showing an existing frame before the modification of the seismic retrofitting structure according to the first embodiment is applied, and (B) is a cross-sectional view according to the first embodiment. It is sectional drawing corresponding to FIG. 2 (B) which shows the existing frame to which the modification of the seismic retrofitting structure is applied. It is sectional drawing corresponding to FIG. 2A which shows the existing frame before the modification of the seismic retrofitting structure which concerns on 1st Embodiment is applied. It is sectional drawing corresponding to FIG. 2 (B) which shows the existing frame to which the modification of the seismic retrofitting structure which concerns on 1st Embodiment is applied.

(First Embodiment)
First, the first embodiment will be described.

(Existing structure)
FIG. 1 shows an existing structure (existing building) 10 having a plurality of layers to which the seismic retrofitting structure 40 according to the first embodiment is applied. The existing structure 10 includes an existing frame 20 that is continuous in the vertical direction and the horizontal direction. The arrow X shown in each figure indicates the vertical direction of the existing structure 10, and the arrow Y indicates the horizontal direction of the existing structure 10.

(Existing frame)
The existing frame 20 has a pair of existing columns 22 and upper and lower existing beams 24. The pair of existing columns 22 are made of steel frame, reinforced concrete, or steel reinforced concrete. Upper and lower existing beams 24 are erected on the pair of existing columns 22.

As shown in FIGS. 2A and 2B, the existing beam 24 is made of steel. More specifically, the existing beam 24 is formed of H-shaped steel. The existing beam 24 has a pair of upper flange portions 24A and lower flange portions 24B facing each other in the vertical direction, and a web portion 24C connecting the upper flange portion 24A and the lower flange portion 24B. Further, an existing slab 12 is provided on the existing beam 24. An existing concrete wall 30 is joined to the existing beam 24.

The existing beam 24 is not limited to the H-shaped steel, but may be an I-shaped steel or a C-shaped steel.

(Existing concrete wall)
As shown in FIG. 1, among a plurality of existing frames 20 that are continuous in the vertical direction (arrow X direction) and the horizontal direction (arrow Y direction), some of the existing frames 20 are in the frame (inside the structure). , The existing concrete wall 30 is provided. The existing concrete wall 30 is continuous in the vertical direction and the horizontal direction. Further, the plurality of existing concrete walls 30 that are continuous in the vertical direction are regarded as a multi-story wall.

The existing concrete wall 30 is, for example, a bearing wall, a seismic wall, or a miscellaneous wall. The existing concrete wall 30 is arranged between the pair of existing columns 22 and between the upper and lower existing beams 24. As shown in FIGS. 2 (A) and 2 (B), the existing concrete wall 30 is made of reinforced concrete, and a plurality of wall bars 32 are embedded therein. Further, the existing concrete wall 30 is joined to the upper and lower existing beams 24 via, for example, a stud 26.

The existing concrete wall 30 of the present embodiment is also joined to the pair of existing pillars 22, but the existing concrete wall 30 does not have to be joined to the pair of existing pillars 22.

As shown in FIG. 1, a plurality of existing frames 20 provided with existing concrete walls 30 (hereinafter referred to as “existing frame with walls 20X”) are arranged in a rectangular shape in an elevation view. Further, in an elevation view, the existing frame 20 in which no concrete wall (existing concrete wall) is provided on the outer periphery of the existing frame 20X with a plurality of walls (hereinafter referred to as "wall-less existing frame 20Y"). Is provided.

The plurality of wallless existing frames 20Y are continuously arranged in the vertical direction or the horizontal direction along the outer peripheral portion of the plurality of walled existing frames 20X, and surround the plurality of walled existing frames 20X. As described above, there is no concrete wall in the frame (inside the frame) of the existing frame 20Y without walls, and an opening is formed. The seismic retrofitting structure 40 according to the present embodiment is applied to these existing wall-mounted frames 20X.

(Seismic retrofitting structure)
The seismic retrofitting structure 40 has a plurality of beam reinforcing portions 62. The plurality of beam reinforcing portions 62 are the upper existing beams 24 (hereinafter, “upper existing beam 24U”) constituting the existing frame 20 at the uppermost end (top floor) of the plurality of wall-mounted existing frames 20X continuous in the vertical direction. "). Further, in the present embodiment, among the plurality of existing walled frames 20X continuous in the vertical direction, in the plurality of existing frames 20 at the uppermost end (top floor), the plurality of upper existing beams 24U continuously connected in the horizontal direction are used. Beam reinforcing portions 62 are provided respectively.

(Beam reinforcement)
As shown in FIG. 2B, the beam reinforcing portion 62 is a boosting reinforcement portion for reinforcing the existing upper beam 24U. The beam reinforcing portion 62 is formed in a rectangular cross section. The upper existing beam 24U is buried inside the beam reinforcing portion 62. Further, a plurality of upper end beam main bars 64, a plurality of lower end beam main bars 66, and a plurality of connecting bars 68 and 69 are embedded in the beam reinforcing portion 62.

The upper end beam main bar 64 is embedded in the upper corner portion of the beam reinforcing portion 62, respectively. Further, the lower end beam main bar 66 is embedded in the lower corner portion of the beam reinforcing portion 62, respectively. The upper end beam main bar 64 and the lower end beam main bar 66 are arranged along the upper existing beam 24U, and both ends thereof are connected to a pair of existing columns 22 (see FIG. 1). The upper end beam main bar 64 and the lower end beam main bar 66 are examples of the beam main bar.

The connecting bars 68 are arranged on both sides of the upper existing beam 24U, respectively. Each connecting bar 68 is embedded over the beam reinforcing portion 62 and the existing slab 12, and joins the beam reinforcing portion 62 and the existing slab 12. Further, the connecting bar 69 is bent into an L shape. Each connecting bar 69 is embedded over the beam reinforcing portion 62 and the existing concrete wall 30, and joins the beam reinforcing portion 62 and the existing concrete wall 30. The connecting bars 68 and 69 are connected to the existing slab 12 or the existing concrete wall 30 via, for example, a post-construction anchor such as a chemical anchor (not shown).

Due to the beam reinforcing portion 62 configured in this way, the upper existing beam 24U is made of steel-framed reinforced concrete. As a result, the binding force of the existing concrete wall 30 by the upper existing beam 24U is enhanced. More specifically, the restraining force of the upper existing beam 24U that restrains the shear deformation (rotational deformation) of the existing concrete wall 30 at the time of an earthquake from above is enhanced.

(Action)
Next, the operation of the first embodiment will be described.

According to the seismic retrofitting structure 40 according to the first embodiment, the plurality of existing walled frames 20X are continuous in the vertical direction, and the existing concrete walls 30 are provided in the frame. Further, among the plurality of existing walled frames 20X, the upper existing beam 24U constituting the walled existing frame 20X at the uppermost end is provided with a beam reinforcing portion 62, respectively. These beam reinforcing portions 62 enhance the binding force of the existing concrete wall 30 by the upper existing beam 24U.

Here, when the binding force of the existing concrete wall 30 by the upper existing beam 24U is low, the resistance of the upper existing beam 24U to the shear deformation of the existing concrete wall 30 at the time of an earthquake becomes small, and the existing concrete wall 30 has sufficient proof stress. It may not be possible to exert it.

On the other hand, in the present embodiment, as described above, the beam reinforcing portion 62 is provided on the upper existing beam 24U. The beam reinforcing portion 62 enhances the binding force of the existing concrete wall 30 by the upper existing beam 24U. More specifically, the upper existing beam 24U suppresses the shear deformation (rotational deformation) of the existing concrete wall 30 at the time of an earthquake from above. As a result, in the event of an earthquake, the existing concrete wall 30 can sufficiently exert its proof stress, so that the proof stress of the existing concrete wall 30 is enhanced. In other words, the yield strength of the existing concrete wall 30 can be highly evaluated by increasing the binding force of the existing concrete wall 30 by the upper existing beam 24U.

Further, when the binding force of the existing concrete wall 30 by the upper existing beam 24U is increased, the binding force of the existing concrete wall 30 directly below (lower floor) of the existing concrete wall 30 is also increased. Therefore, in the present embodiment, the binding force of all the existing concrete walls 30 continuous below the upper existing beam 24U is enhanced. That is, the yield strength of all the existing concrete walls 30 continuous below the upper existing beam 24U is enhanced.

As described above, in the present embodiment, it is possible to increase the proof stress of the plurality of existing concrete walls 30 without reinforcing each of the plurality of existing concrete walls 30 that are continuous in the vertical direction. Therefore, in the present embodiment, it is possible to increase the yield strength of the plurality of existing concrete walls 30 while improving the workability.

Further, in the present embodiment, in the existing frame 20 at the uppermost end of the plurality of existing frames 20 which are continuous in the vertical direction, the beam reinforcing portions 62 are provided on the plurality of upper existing beams 24U which are continuous in the horizontal direction. As a result, the binding force of all the existing concrete walls 30 continuous below the plurality of upper existing beams 24U continuous in the horizontal direction is enhanced. As a result, the proof stress of all the existing concrete walls 30 continuous below the plurality of upper existing beams 24U continuous in the horizontal direction is enhanced.

As described above, in the present embodiment, it is possible to efficiently increase the proof stress of the existing concrete wall 30 provided in the frame of the existing frame 20X having a plurality of walls continuously in the vertical direction and the horizontal direction.

(Second embodiment)
Next, the second embodiment will be described. In the second embodiment, the members and the like having the same configuration as that of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 3 shows an existing structure 10 composed of a plurality of layers to which the seismic retrofitting structure 50 according to the second embodiment is applied. The seismic retrofitting structure 50 according to the second embodiment has a plurality of column reinforcing portions 52.

The plurality of column reinforcing portions 52 are located at both ends of a plurality of horizontally continuous walled existing frames 20X, and are provided on the outer existing columns 22 (hereinafter referred to as “outer existing columns 22S”) constituting the existing frame 20. Has been done. Further, in the present embodiment, in the plurality of existing frames 20 at both ends of the plurality of existing frames 20 that are continuous in the horizontal direction, the column reinforcing portions 52 are provided on the plurality of outer existing columns 22S that are continuous in the vertical direction.

Although not shown, the column reinforcing portion 52 is, for example, an additional striking reinforcing portion for additional striking reinforcement of the outer existing column 22S, similarly to the beam reinforcing portion 62 in the first embodiment.

(Action)
Next, the operation of the second embodiment will be described.

According to the seismic retrofitting structure 50 according to the second embodiment, the plurality of existing frames 20 are continuous in the horizontal direction, and the existing concrete walls 30 are provided in the frames. Further, column reinforcing portions 52 are provided on the outer existing columns 22S which are located at both ends of a plurality of existing frames 20 which are continuous in the horizontal direction and constitute the existing frame 20. By these column reinforcing portions 52, the binding force of the existing concrete wall 30 by the outer existing column 22S can be enhanced.

Here, when the binding force of the existing concrete wall 30 by the existing column 22 is low, the resistance of the existing frame 20 to the shear deformation (rotational deformation) of the existing concrete wall 30 at the time of an earthquake becomes small, and the existing concrete wall 30 has a proof stress. It may not be fully exerted.

On the other hand, in the present embodiment, as described above, the column reinforcing portion 52 is provided on the outer existing column 22S. The column reinforcing portion 52 enhances the binding force of the existing concrete wall 30 by the outer existing column 22S. As a result, in the event of an earthquake, the existing concrete wall 30 can sufficiently exert its proof stress, so that the proof stress of the existing concrete wall 30 is enhanced. In other words, the yield strength of the existing concrete wall 30 can be highly evaluated by increasing the binding force of the existing concrete wall 30 by the outer existing pillar 22S.

Further, by providing column reinforcing portions 52 on the outer existing columns 22S that are located at both ends of the plurality of existing frames 20 that are continuous in the horizontal direction and that constitute the existing frame 20, all the outer existing columns 22S at both ends are provided. The binding force of the existing concrete wall 30 is enhanced. As a result, the yield strength of all the existing concrete walls 30 between the outer existing columns 22S at both ends is enhanced.

As described above, in the present embodiment, the proof stress of the plurality of existing concrete walls 30 can be increased without reinforcing the plurality of existing concrete walls 30 respectively. Therefore, in the present embodiment, it is possible to increase the yield strength of the plurality of existing concrete walls 30 while improving the workability.

Further, in the present embodiment, in the plurality of existing frames 20 at both ends of the plurality of existing frames 20 that are continuous in the horizontal direction, the column reinforcing portions 52 are provided on the plurality of outer existing columns 22S that are continuous in the vertical direction. As a result, the binding force of all the existing concrete walls 30 between the outer existing columns 22S at both ends is enhanced. As a result, the yield strength of all the existing concrete walls 30 on the outer existing columns 22S at both ends is enhanced.

As described above, in the present embodiment, the proof stress of the existing concrete wall 30 provided in each of the plurality of existing frames 20 that are continuous in the vertical direction and the horizontal direction can be efficiently increased.

(Modification example)
Next, modifications of the first embodiment and the second embodiment will be described. In the following, various modifications will be described mainly by taking the first embodiment as an example, but these modifications can be appropriately applied to the second embodiment.

In the first embodiment, the upper existing beam 24U is made of steel, but the embodiment is not limited to this. For example, as shown in FIG. 4A, the upper existing beam 70 may be made of reinforced concrete.

Specifically, the upper existing beam 70 is formed in a rectangular cross section. The width of the upper existing beam 70 is the same as the wall thickness of the existing concrete wall 30. Upper end beam main bars 72 are embedded in the upper corners of the upper existing beam 70, respectively. Further, a lower end beam main bar 74 is embedded in each of the lower corners of the upper existing beam 70. Further, in the upper existing beam 70, a shear reinforcing bar 76 surrounding the upper end beam main bar 72 and the lower end beam main bar 74 is embedded.

The upper existing beam 70 is reinforced by the beam reinforcing portion 82, for example, as shown in FIG. 4 (B). The beam reinforcing portion 82 is a boosting reinforcement portion for reinforcing the existing upper beam 70 by boosting. The beam reinforcing portions 82 are provided on both sides of the upper existing beam 70 and the existing concrete wall 30, respectively.

Each beam reinforcing portion 82 covers the side surface of the upper existing beam 70 over the entire surface, and also covers the upper wall surface of the existing concrete wall 30. Further, a plurality of connecting bars 68 and 69 are embedded in each beam reinforcing portion 82. The connecting bars 68 and 69 are connected to the existing slab 12 or the existing concrete wall 30 via, for example, a post-construction anchor such as a chemical anchor (not shown). Further, a plurality of reinforcing bars 84 are embedded in the lower part of each beam reinforcing portion 82. The plurality of reinforcing bars 84 are arranged along the material axis direction of the upper existing beam 70.

By reinforcing the upper existing beam 70 by the beam reinforcing portion 82 configured in this way, the binding force of the existing concrete wall 30 by the upper existing beam 70 is enhanced. Therefore, the yield strength of the existing concrete wall 30 is enhanced.

Further, for example, FIG. 5A shows an upper existing beam 80 made of reinforced concrete. The upper existing beam 80 is formed in a rectangular cross section. The width of the upper existing beam 80 is wider than the wall thickness of the existing concrete wall 30.

The upper existing beam 80 is reinforced by the beam reinforcing portion 92, for example, as shown in FIG. 5 (B). The beam reinforcing portions 92 are provided on both sides of the existing concrete wall 30 and on the lower side of the upper existing beam 80, respectively. A plurality of connecting bars 94 and a plurality of reinforcing bars 96 are embedded in the beam reinforcing portion 92.

The plurality of connecting bars 94 are bent in an L shape. Each connecting bar 94 is embedded over the upper part of the existing concrete wall 30 and the upper existing beam 80, and joins the existing concrete wall 30 and the upper existing beam 80. Further, the plurality of reinforcing bars 96 are arranged along the material axis direction of the upper existing beam 80. The connecting bar 94 is connected to the existing slab 12 or the existing concrete wall 30 via, for example, a post-construction anchor such as a chemical anchor (not shown).

By reinforcing the upper existing beam 80 by the beam reinforcing portion 92 configured in this way, the binding force of the existing concrete wall 30 by the upper existing beam 80 is enhanced. Therefore, the yield strength of the existing concrete wall 30 is enhanced.

Further, for example, in FIG. 6, the existing concrete wall 30 is provided on the outside of the steel-framed upper existing beam 24U. The existing concrete wall 30 is, for example, an outer wall. The existing concrete wall 30 is joined to the side surface of the upper existing beam 24U.

Specifically, the upper portion of the existing concrete wall 30 is joined to the side surface of the upper existing beam 24U via the concrete joint portion 34. The concrete joint portion 34 is provided over the entire length of the upper existing beam 24U. Further, the concrete joint portion 34 is provided over the upper portion of the existing concrete wall 30 and the web portion 24C of the upper existing beam 24U. The concrete joint portion 34 is made of reinforced concrete, and a plurality of connecting bars 36 are embedded therein.

The connecting bar 36 is bent in a C shape and is arranged between the upper part of the existing concrete wall 30 and the upper existing beam 24U. Further, a plurality of connecting bars 36 are arranged at intervals in the material axis direction of the upper existing beam 24U. One end side of each connecting bar 36 is joined to the upper existing beam 24U by welding or the like. Further, the other end side of each connecting bar 36 is embedded in the existing concrete wall 30. The upper existing beam 24U and the existing concrete wall 30 are joined by the concrete joint portion 34 in which the plurality of connecting bars 36 are embedded in this way.

The upper existing beam 24U is reinforced by the beam reinforcing portion 42, for example, as shown in FIG. 7. The beam reinforcing portion 42 is an additional reinforcement portion (additional concrete reinforcement portion) that covers the inner side surface (opposite side of the existing concrete wall 30) and the lower surface of the upper existing beam 24U. Further, the beam reinforcing portion 42 is provided over the entire length of the upper existing beam 24U, and both ends thereof are connected to a pair of existing columns 22. The beam reinforcing portion 42 increases the cross-sectional area of the upper existing beam 24U.

The beam reinforcing portion 42 is made of reinforced concrete, and a plurality of connecting bars 44 and 46 and a plurality of reinforcing bars 48 are embedded therein. The connecting bar 44 is bent into an L shape. One end of the connecting bar 44 is connected to the upper part of the existing concrete wall 30 via, for example, a post-construction anchor such as a chemical anchor (not shown). Further, the other end of the connecting bar 44 is connected to the existing slab 12 via, for example, a post-construction anchor. The beam reinforcing portion 42 is joined to the existing concrete wall 30 and the existing slab 12 by the connecting bar 44, respectively.

The connecting bar 46 is arranged below the upper existing beam 24U. One end of the connecting bar 46 is connected to the upper part of the existing concrete wall 30 via, for example, a post-construction anchor. Further, the other end of the connecting bar 46 is embedded in the beam reinforcing portion 42. The existing concrete wall 30 and the beam reinforcing portion 42 are joined by the connecting bar 46. Further, the plurality of reinforcing bars 48 are arranged along the material axis direction of the upper existing beam 24U.

By reinforcing the upper existing beam 24U by the beam reinforcing portion 42 configured in this way, the binding force of the existing concrete wall 30 by the upper existing beam 24U is enhanced. Therefore, the yield strength of the existing concrete wall 30 is enhanced.

Next, in the first embodiment, the beam reinforcing portion 62 is reinforced by additional striking, but the first embodiment is not limited to this. The beam reinforcing portion may be, for example, rib reinforcement or the like, as long as the binding force of the existing concrete wall 30 by the upper existing beam 24U can be increased. Similarly, in the second embodiment, the column reinforcing portion 52 is reinforced by additional striking, but the second embodiment is not limited to this. The column reinforcing portion may be, for example, a cover plate reinforcement or the like, as long as the binding force of the existing concrete wall 30 by the outer existing column 22S can be increased.

Next, in the first embodiment, the beam reinforcing portion 62 is provided on each of the plurality of horizontally continuous upper existing beams 24U, but the beam reinforcing portion 62 is a plurality of horizontally continuous upper existing beams 24U. It can be provided in at least one. Similarly, in the second embodiment, the column reinforcing portion 52 is provided on each of the plurality of outer existing columns 22S continuous in the vertical direction, but the column reinforcing portion 52 is provided with the plurality of outer existing columns continuous in the vertical direction. It can be provided in at least one of 22S.

Next, in the first embodiment, the plurality of existing walled frames 20X are continuous in the horizontal direction, but the existing walled frames 20X may not be continuous in the horizontal direction. That is, the existing structure 10 may be configured only by a row of existing walled frames 20X that are continuous in the vertical direction. Similarly, in the second embodiment, the plurality of existing walled frames 20X are continuous in the vertical direction, but the existing walled frame 20X does not have to be continuous in the vertical direction. That is, the existing structure 10 may be configured only by a row of existing walled frames 20X that are continuous in the horizontal direction.

Further, in the first embodiment, a plurality of wallless existing frames 20Y are provided on the outer periphery of a plurality of walled existing frames 20X that are continuous in the vertical direction and the horizontal direction, and these wallless existing frames 20Y are appropriately used. It can be omitted. That is, all of the existing structure 10 may be a seismic retrofitting structure 40, or a part of the existing structure 10 may be a seismic retrofitting structure 40. Further, for example, in FIG. 1, walled existing frames 20X may be provided on both sides of a plurality of horizontally continuous walled existing frames 20X instead of wallless existing frames 20Y.

Further, in the second embodiment, a plurality of wall-less existing frames 20Y are provided on the outer periphery of a plurality of wall-existing existing frames 20X that are continuous in the vertical and horizontal directions, but these wall-less existing frames 20Y are appropriately used. It can be omitted. That is, all of the existing structure 10 may be a seismic retrofitting structure 50, or a part of the existing structure 10 may be a seismic retrofitting structure 50. Further, for example, in FIG. 3, wallless existing frames 20Y are provided above and below a plurality of walled existing frames 20X that are continuous in the vertical direction. However, instead of wallless existing frames 20Y, walled existing frames 20X are provided. It may be provided.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate. Of course, it can be carried out in various embodiments as long as it does not deviate.

10 Existing structure 20 Existing frame 20X Walled existing frame (existing frame)
22 Existing column 22S Outer existing column 24U Upper existing beam 30 Existing concrete wall 40 Seismic reinforcement structure 42 Beam reinforcing part 50 Seismic reinforcement structure 52 Column reinforcing part 62 Beam reinforcing part 70 Upper existing beam 80 Upper existing beam 82 Beam reinforcing part 92 Beam reinforcement Department

Claims (3)

Multiple existing frames that are continuous in the vertical direction and have existing concrete walls inside the frame,
Of the plurality of existing frames, a beam reinforcing portion provided only on the upper existing beam constituting the existing frame at the uppermost end and increasing the binding force of the existing concrete wall by the upper existing beam, and a beam reinforcing portion.
Among the plurality of existing frames, a connecting bar embedded over the existing concrete wall and the beam reinforcing portion of the existing frame on the top floor, and
Seismic retrofitting structure with. Multiple existing frames that are continuous in the horizontal direction and have existing concrete walls inside the frame,
A column reinforcing portion located at both ends of a plurality of horizontally continuous existing frames and provided only on the outer existing columns constituting the existing frame to increase the binding force of the existing concrete wall by the outer existing columns.
Of the plurality of existing frames, connecting bars embedded over the existing concrete walls and column reinforcing portions of the existing frames at both ends, and
Seismic retrofitting structure with. The plurality of existing frames are continuous in the horizontal direction and the vertical direction.
The seismic retrofitting structure according to claim 1 or 2.

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