JP7127244B2 - Seismic reinforcement structure - Google Patents

Description

The present invention relates to a seismic reinforcing structure.

There is known a seismic reinforcement structure in which an existing concrete wall is additionally reinforced (see, for example, Patent Documents 1 and 2).

JP-A-8-49329 JP 2005-220591 A

However, with the earthquake-resistant reinforcement structure described above, the range of additional concrete reinforcement increases according to the size of the existing concrete wall, so there is a possibility that construction will take time and effort.

SUMMARY OF THE INVENTION In view of the above facts, it is an object of the present invention to improve the workability and increase the strength of an existing concrete wall.

A seismic reinforcement structure according to a first aspect includes an existing frame having a pair of existing columns, upper and lower existing beams erected on the pair of existing columns, an existing concrete wall provided on the existing frame, and the and an additional reinforcing part provided on at least one of the existing column and the existing beam.

According to the quake-resistant reinforcement structure according to the first aspect , the existing frame has a pair of existing columns and upper and lower existing beams constructed over the pair of existing columns. In addition, existing concrete walls are provided on the existing frame. At least one of the existing columns and existing beams of the existing frame is provided with an additional reinforcing part (an additional concrete reinforcing part).

Here, if the existing concrete wall has a low binding force due to the existing frame, the resistance of the existing frame to the existing concrete wall is reduced, and the existing concrete wall may not be able to fully demonstrate its bearing strength.

On the other hand, in the present invention, as described above, at least one of the existing columns and the existing beams of the existing frame is provided with additional reinforcing parts. By reinforcing (stiffening) at least one of the existing columns and the existing beams with the additional reinforcing part, the force of restraining the existing concrete wall by the existing frame is increased. As a result, the existing concrete wall can fully exhibit its bearing strength in the event of an earthquake, so the bearing strength of the existing concrete wall is increased. In other words, by increasing the binding force of the existing concrete wall by the existing frame, the bearing strength of the existing concrete wall can be evaluated highly.

In addition, in the present invention, as compared with the case where the entire surface of an existing concrete wall is additionally reinforced, the reinforced range can be narrowed, so workability is improved. Furthermore, according to the present invention, since the wall thickness of the existing concrete wall is not increased, the impact on the interior of the room upon completion of seismic reinforcement can be reduced.

As described above, the present invention can improve the workability, reduce the impact on the interior of the room, and increase the strength of the existing concrete wall.

A seismic reinforcement structure according to a second aspect is the earthquake resistance reinforcement structure according to the first aspect , wherein the additional reinforcing portion is provided over the entire length of at least one of the existing beam and the existing column.

According to the seismic reinforcement structure according to the second aspect , the additional reinforcing part is provided over the entire length of at least one of the existing beam and the existing column. This further increases the binding force of the existing concrete wall by the existing frame. Therefore, the bearing strength of the existing concrete wall is further increased.

A seismically reinforced structure according to a third aspect is the seismically reinforced structure according to the second aspect , wherein the existing beams are steel-framed and embedded in the additional reinforcement portion, and the additional reinforcement portion includes a beam main reinforcement. is buried.

According to the earthquake-resistant reinforcement structure according to the third aspect , the existing beams are made of steel and are embedded in the additional reinforcing part. Further, the beam main reinforcement is embedded in the additional reinforcing portion. In other words, the steel beams are made of steel reinforced concrete by the additional reinforcing parts and the beam main bars. This further increases the binding force of the existing concrete wall by the existing frame. Therefore, the bearing strength of the existing concrete wall is further increased.

As described above, according to the earthquake-resistant reinforcement structure according to the present invention, it is possible to increase the yield strength of existing concrete walls while improving workability.

It is the elevation view which looked at the outer peripheral part of the existing structure which concerns on 1st embodiment from the outside. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; FIG. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing an existing frame to which the seismic reinforcing structure according to the first embodiment is applied; FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing an existing frame to which the seismic reinforcing structure according to the second embodiment is applied; (A) is a cross-sectional view corresponding to FIG. 2 showing a modification of the existing beam, and (B) is a cross-sectional view corresponding to FIG. 2 showing a modification of the earthquake-resistant reinforcement structure. (A) is a cross-sectional view corresponding to FIG. 2 showing a modification of the existing beam, and (B) is a cross-sectional view corresponding to FIG. 2 showing a modification of the earthquake-resistant reinforcement structure. (A) is a cross-sectional view corresponding to FIG. 2 showing a modification of the existing beam, and (B) is a cross-sectional view corresponding to FIG. 2 showing a modification of the earthquake-resistant reinforcement structure.

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

(existing structure)
FIG. 1 shows an existing structure (existing building) 10 before application of an earthquake-resistant reinforcement structure 40 according to this embodiment. The existing structure 10 has an existing frame 20 and an existing concrete wall 30 .

The existing frame 20 and the existing concrete wall 30 are arranged on the outer periphery of the existing structure 10 . That is, the existing frame 20 of the present embodiment is a perimeter frame (existing perimeter frame), and the existing concrete wall 30 of this embodiment is an outer wall (existing concrete outer wall). Note that the existing concrete wall 30 is not limited to an outer wall, and may be an inner wall.

(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, reinforced concrete, or steel-reinforced concrete. Upper and lower existing beams 24 are laid over the pair of existing pillars 22 .

As shown in FIG. 2, the existing beam 24 is of steel construction. More specifically, the existing beams 24 are made of H-section steel. The existing beam 24 has a pair of upper flange portion 24A and lower flange portion 24B that face each other in the vertical direction, and a web portion 24C that connects the upper flange portion 24A and the lower flange portion 24B. Moreover, the existing slab 12 is provided on the existing beam 24 . An existing concrete wall 30 is joined to the existing beam 24 .

The existing beams 24 are not limited to H-section steel, and may be I-section steel or C-section steel.

(existing concrete wall)
The existing concrete wall 30 is, for example, a load-bearing wall, an earthquake-resistant wall, or a rough wall. The existing concrete wall 30 is made of reinforced concrete, and has a plurality of wall reinforcements 32 embedded therein. The existing concrete walls 30 are arranged outside the upper and lower existing beams 24 and are joined to the side surfaces of the upper and lower existing beams 24, respectively.

The joint structure between the existing concrete wall 30 and the upper and lower existing beams 24 has the same configuration. Therefore, the joint structure between the upper portion of the existing concrete wall 30 and the upper existing beam 24 will be described below, and the joint structure between the lower portion of the existing concrete wall 30 and the lower existing beam 24 will be omitted.

The upper portion of the existing concrete wall 30 is joined to the side surface of the existing beam 24 via a concrete joint 34 . The concrete joint 34 is provided over the entire length of the existing beam 24 . Also, the concrete joint portion 34 is provided over the upper portion of the existing concrete wall 30 and the web portion 24</b>C of the existing beam 24 . The concrete joint 34 is made of reinforced concrete, and a plurality of connection bars 36 are embedded therein.

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

Note that the reinforcement arrangement of the concrete joint portion 34 can be changed as appropriate. Although not shown, the left and right ends of the existing concrete wall 30 are joined to a pair of existing columns 22, respectively.

(Earthquake-resistant reinforcement structure)
FIG. 3 shows the existing frame 20 (see FIG. 1) to which the earthquake-resistant reinforcing structure 40 according to this embodiment is applied. The earthquake-resistant reinforcement structure 40 has an additional reinforcement portion (additional concrete reinforcement portion) 42 provided on the existing upper beam 24 .

(Increase reinforcement part)
The additional reinforcing part 42 covers the inner side surface (the side opposite to the existing concrete wall 30 ) and the lower surface of the upper existing beam 24 . Further, the additional reinforcement part 42 is provided over the entire length of the existing beam 24 and both ends thereof are connected to the pair of existing columns 22 . The cross-sectional area of the existing beam 24 is increased by the additional reinforcing portion 42 .

The additional reinforcing part 42 is made of reinforced concrete, and has a plurality of connecting bars 44 and 46 and a plurality of reinforcing bars 48 embedded therein. The connecting muscle 44 is bent in an L shape. One end of this connection bar 44 is connected to the upper portion of the existing concrete wall 30 via a post-installed anchor such as a chemical anchor (not shown). Also, the other end of the connection bar 44 is connected to the existing slab 12 via, for example, a post-installed anchor. The additional reinforcing part 42 is joined to the existing concrete wall 30 and the existing slab 12 by the connection bar 44 .

The connection bars 46 are arranged below the existing beams 24 . One end of this connecting bar 46 is connected to the upper portion of the existing concrete wall 30 via, for example, a post-installed anchor. Further, the other end of the connection bar 46 is embedded in the additional reinforcing portion 42 . The connecting bar 46 joins the existing concrete wall 30 and the additional reinforcing portion 42 . A plurality of reinforcing bars 48 are arranged along the material axis direction of the existing beam 24 .

The cross-sectional area of the existing beam 24 is increased by the additional reinforcing portion 42 configured in this way. In addition, the binding force of the existing beams 24 on the upper part of the existing concrete wall 30 is increased.

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

According to the earthquake-resistant reinforcement structure 40 according to the present embodiment, the existing frame 20 has a pair of existing columns 22 and upper and lower existing beams 24 constructed over the pair of existing columns 22 . An existing concrete wall 30 is provided on the existing frame 20 . The existing beam 24 on the upper side of the existing frame 20 is provided with an additional reinforcing part 42 .

Here, for example, when the binding force of the existing concrete wall 30 by the upper existing beam 24 is low, the resistance force of the existing frame 20 against the existing concrete wall 30 becomes small. More specifically, the resistance of the existing beams 24 to shear deformation of the existing concrete walls 30 during an earthquake is reduced. Therefore, the existing concrete wall 30 may not be able to exhibit its bearing strength sufficiently.

As a countermeasure against this, in this embodiment, the existing beam 24 on the upper side is provided with an additional reinforcing portion 42 . By reinforcing (stiffening) the existing beam 24 on the upper side with the additional reinforcing portion 42 , the binding force of the existing beam 24 to the existing concrete wall 30 is increased. As a result, the existing concrete wall 30 can sufficiently exert its bearing strength in the event of an earthquake, so that the bearing strength of the existing concrete wall 30 is increased. In other words, by increasing the binding force of the existing concrete wall 30 by the existing beams 24 on the upper side, the bearing strength of the existing concrete wall 30 can be evaluated highly.

As described above, in this embodiment, the bearing strength of the existing concrete wall 30 can be increased without reinforcing the existing concrete wall 30 by additional reinforcement. In addition, in this embodiment, compared to the case where the entire surface of the existing concrete wall 30 is additionally reinforced, the reinforced range can be narrowed. Therefore, workability is improved.

Furthermore, if the entire surface of the existing concrete wall 30 is additionally reinforced, the wall thickness of the existing concrete wall 30 will be increased, so there is a possibility that the room (room space) will become narrower. In contrast, in this embodiment, the strength of the existing concrete wall can be increased without increasing the wall thickness of the existing concrete wall 30, that is, without narrowing the room.

Further, the additional reinforcing part 42 is provided over the entire length of the existing beam 24 . As a result, the force of binding the existing concrete wall 30 by the existing beams 24 is increased. Further, the additional reinforcing part 42 is connected to the pair of existing pillars 22 . As a result, the binding force of the existing beams 24 on the upper portion of the existing concrete wall 30 is further enhanced. Therefore, the bearing strength of the existing concrete wall 30 can be further increased.

Further, in this embodiment, an additional reinforcing part 42 is provided on the existing beam 24 on the upper side. Shear deformation (rotational deformation) of the existing concrete wall 30 during an earthquake is suppressed from above by the existing beams 24 on the upper side. As a result, in this embodiment, the binding force of the existing beams 24 to the existing concrete wall 30 can be efficiently increased compared to the case where the additional reinforcement part 42 is provided only on the existing beams 24 on the lower side. Therefore, in this embodiment, the bearing strength of the existing concrete wall 30 can be efficiently increased.

(Second embodiment)
Next, a second embodiment will be described. In addition, in the second embodiment, members having the same configuration as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 4 shows the existing frame 20 (see FIG. 1) to which the seismic reinforcing structure 50 according to the second embodiment is applied. The earthquake-resistant reinforcement structure 50 has an additional reinforcing portion 52 provided on the existing upper beam 24 . Due to the additional reinforcing part 52, the upper existing beam 24 is a steel-reinforced concrete structure (SRC structure).

Specifically, the additional reinforcement portion 52 includes a plurality of top beam main reinforcements 54, a plurality of bottom beam main reinforcements 56, a plurality of shear reinforcements 57, a plurality of connection reinforcements 58 and 59, and a plurality of reinforcements 60. and A plurality of upper end beam main reinforcements 54 are embedded in the upper part of the additional reinforcing part 52 in, for example, two rows and three stages. Similarly, the plurality of lower end beam main reinforcements 56 are embedded in the lower part of the additional reinforcement portion 52 in, for example, two rows and three stages. The upper end beam main reinforcement 54 and the lower end beam main reinforcement 56 are arranged along the material axis direction of the existing beam 24, and both ends are connected to a pair of existing columns 22 (see FIG. 1). These top beam main reinforcement 54 and bottom beam main reinforcement 56 are surrounded by a plurality of shear reinforcements 57 . A plurality of shear reinforcing bars 57 are arranged at intervals in the material axis direction of the existing beam 24 . The upper end beam main reinforcement 54 and the lower end beam main reinforcement 56 are examples of beam main reinforcements.

A plurality of connection bars 58 are embedded over the upper portion of the additional reinforcing portion 52 and the existing slab 12 to join the additional reinforcing portion 52 and the existing slab 12 . A plurality of connection bars 59 are embedded across the lower portion of the additional reinforcing portion 52 and the upper portion of the existing concrete wall 30 to join the additional reinforcing portion 52 and the existing concrete wall 30 . Also, the plurality of reinforcing bars 60 are arranged along the material axis direction of the existing beam 24 .

The cross-sectional area of the existing beam 24 is increased by the additional reinforcing portion 52 configured in this manner. In addition, the force of binding the existing concrete wall 30 by the existing beams 24 is enhanced.

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

According to the earthquake-resistant reinforcement structure 50 according to the present embodiment, the existing beam 24 on the upper side is provided with the additional reinforcement portion 52 . By reinforcing (stiffening) the existing beam 24 on the upper side with the additional reinforcement portion 52 , the binding force of the existing beam 24 to the existing concrete wall 30 is increased. Therefore, the bearing strength of the existing concrete wall 30 is enhanced.

In addition, by embedding a plurality of upper end beam main reinforcements 54 and lower end beam main reinforcements 56 in the additional reinforcing part 52 and replacing the existing steel-framed beams 24 with steel-reinforced concrete, the existing beams 24 restrain the existing concrete wall 30. further enhanced. Therefore, the bearing strength of the existing concrete wall 30 can be further increased.

(Modification)
Next, modified examples of the first embodiment and the second embodiment will be described. Various modifications will be described below using the first embodiment as an example, but these modifications can also be appropriately applied to the second embodiment.

In the first embodiment, the existing concrete wall 30 is arranged outside the existing beams 24, but the first embodiment is not limited to this. For example, as shown in FIG. 5(A), the existing concrete wall 30 may be placed between the upper and lower existing beams 24 . In addition, in FIG. 5A, illustration of the existing beam 24 on the lower side is omitted.

Specifically, FIG. 5A shows the existing beam 24 on the upper side. An existing concrete wall 30 is arranged below the lower flange portion 24B of the existing beam 24 . A stud 26 is joined to the lower flange portion 24B of the existing beam 24 by welding or the like. The existing beam 24 and the existing concrete wall 30 are joined via this stud 26 .

Here, the existing beam 24 is reinforced by an additional reinforcing portion 62, for example, as shown in FIG. 5(B). Specifically, the additional reinforcement portion 62 is formed to have a rectangular cross section. The existing beam 24 is embedded inside the additional reinforcing portion 62 . A plurality of upper end beam main reinforcements 64 , a plurality of lower end beam main reinforcements 66 , and a plurality of connection reinforcements 68 and 69 are embedded in the additional reinforcement portion 62 .

The upper end beam main reinforcements 64 are embedded in the upper corners of the additional reinforcement portions 62 . In addition, the lower end beam main reinforcing bars 66 are embedded in the lower corners of the additional reinforcement portions 62 . The upper end beam main reinforcement 64 and the lower end beam main reinforcement 66 are arranged along the existing beam 24, and both ends are connected to a pair of existing columns 22 (see FIG. 1). The upper end beam main reinforcement 64 and the lower end beam main reinforcement 66 are examples of the beam main reinforcement.

The connection bars 68 are arranged on both sides of the existing beam 24, respectively. Each connecting muscle 68 is embedded over the additional reinforcing portion 62 and the existing slab 12 to join the additional reinforcing portion 62 and the existing slab 12 . Also, the connecting muscle 69 is bent in an L shape. Each connection bar 69 is embedded across the additional reinforcing portion 62 and the existing concrete wall 30 to join the additional reinforcing portion 62 and the existing concrete wall 30 .

The existing beam 24 is made of a steel-framed reinforced concrete structure by the additional reinforcing part 62 configured in this way. As a result, the force of binding the existing concrete wall 30 by the existing beams 24 is increased. Therefore, the bearing strength of the existing concrete wall 30 is enhanced.

Next, in the first embodiment, the existing beams 24 are made of steel, but the first embodiment is not limited to this. For example, as shown in FIG. 6A, the existing beam 70 may be made of reinforced concrete.

Specifically, the existing beam 70 is made of reinforced concrete. Also, the existing beam 70 is formed to have a rectangular cross section. The width of the existing beam 70 is made equal to the wall thickness of the existing concrete wall 30 . Top beam main reinforcements 72 are embedded in upper corners of the existing beams 70, respectively. Bottom beam main reinforcements 74 are embedded in the lower corners of the existing beams 70, respectively. Further, shear reinforcing bars 76 surrounding the upper end beam main reinforcing bars 72 and the lower end beam main reinforcing bars 74 are embedded in the existing beams 70 .

The existing beam 70 is reinforced by an additional reinforcing portion 82, for example, as shown in FIG. 6(B). The additional reinforcing parts 82 are provided on both sides of the existing beam 70 and the existing concrete wall 30, respectively. Each additional reinforcing part 82 covers the entire side surface of the existing beam 70 and also covers the upper wall surface of the existing concrete wall 30 . Further, the above-described plurality of connection bars 68 and 69 are embedded in each additional reinforcing portion 82 . Furthermore, a plurality of reinforcing bars 84 are embedded in the lower portion of each additional reinforcement portion 82 . A plurality of reinforcing bars 84 are arranged along the material axis direction of the existing beam 70 .

By reinforcing the existing beam 70 with the additional reinforcing portion 82 configured in this manner, the binding force of the existing beam 70 to the existing concrete wall 30 is increased. Therefore, the bearing strength of the existing concrete wall 30 is increased.

Further, for example, FIG. 7A shows an existing beam 70 made of reinforced concrete. This existing beam 70 is formed to have a rectangular cross section. The width of this existing beam 70 is made wider than the wall thickness of the existing concrete wall 30 .

The existing beam 70 is reinforced by an additional reinforcing portion 92, for example, as shown in FIG. 7(B). The additional reinforcing parts 92 are provided on both sides of the existing concrete wall 30 and below the existing beams 70, respectively. A plurality of connecting bars 94 and a plurality of reinforcing bars 96 are embedded in the additional reinforcement portion 92 .

The plurality of connection muscles 94 are bent in an L shape. Each connection bar 94 is embedded over the upper portion of the existing concrete wall 30 and the existing beam 70 to join the existing concrete wall 30 and the existing beam 70 . A plurality of reinforcing bars 96 are arranged along the material axis direction of the existing beam 24 .

By reinforcing the existing beam 70 with the additional reinforcing part 92 configured in this way, the binding force of the existing beam 70 to the existing concrete wall 30 is increased. Therefore, the bearing strength of the existing concrete wall 30 is enhanced.

Next, in the above-described first embodiment, the additional reinforcement portion 42 is provided over the entire length of the existing beam 24 , but the additional reinforcement portion can also be partially provided in the existing beam 24 .

Further, in the above-described first embodiment, of the upper and lower existing beams 24, only the upper existing beam 24 is provided with the additional reinforcement portion 42, but the above-described first embodiment is not limited to this. The additional reinforcing part can be provided on at least one of the upper and lower existing beams 24 . Further, the additional reinforcing part may be provided in each existing frame that is continuous in at least one of the vertical direction and the horizontal direction.

Further, the additional reinforcing part can be provided on at least one of the pair of existing columns 22, for example. That is, the additional reinforcing part can be provided on at least one of the existing beam 24 and the existing column 22 . It should be noted that well-known additional reinforcement can be appropriately adopted for the additional reinforcement portion of the existing column 22 .

Further, the shape and arrangement of the additional reinforcement portion can be changed as appropriate. Furthermore, the number, arrangement, and shape of reinforcing bars embedded in the additional reinforcing portion can be changed as appropriate.

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. It goes without saying that various aspects can be implemented without departing from the scope.

10 Existing structure 20 Existing frame 22 Existing column 24 Existing beam 30 Existing concrete wall 40 Seismic reinforcement structure 42 Additional reinforcement part 50 Seismic reinforcement structure 52 Additional reinforcement part 54 Top beam main reinforcement (beam main reinforcement)
56 Bottom beam main reinforcement (beam main reinforcement)
62 Additional reinforcing part 64 Top beam main reinforcement (beam main reinforcement)
66 Bottom beam main reinforcement (beam main reinforcement)
70 Existing beam 82 Additional reinforcing part 92 Additional reinforcing part

Claims (3)

an existing structure having a pair of existing columns and upper and lower existing beams erected on the pair of existing columns;
an existing concrete wall provided on the existing frame;
an additional reinforcing part provided along the existing beam for additional reinforcement of the existing beam ;
a connection bar embedded across the existing concrete wall and the additional reinforcing portion;
Seismic reinforcement structure with The additional reinforcing part is provided over the entire length of the existing beam,
The seismic reinforcement structure according to claim 1. The existing beam is made of steel and is embedded in the reinforcement part,
A beam main reinforcement is embedded in the additional reinforcing part,
The seismic reinforcement structure according to claim 2.

Images