JP2010048032A - Antiseismic reinforcing method and reinforcing piece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antiseismic reinforcing method and a reinforcing piece for reinforcing a column of an existing building without substantially affecting an opening part and an interior space of the existing building. <P>SOLUTION: In the antiseismic reinforcing method for seismically reinforcing the column 152, in particular, of a column-beam frame 15 comprising the column 152 and a beam 151 of the existing building, an opening-part-side face 15a of the column 152 arranged in the opening part of the column-beam frame 15 is held between reinforcing units 10 which are integrally inserted between upper and lower beams 151 in the state that free ends of I-shaped reinforcing pieces 20 are connected to each other. Each of the I-shaped reinforcing pieces 20 comprises a bottom member 21 which is in contact with the upper or the lower face of the beam 151, a vertical member 22 rising from the bottom member 21 at a right angle, and a concrete member 23 formed into a rectangular column in a manner of filling and wrapping the vertical member 22. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing method in an earthquake-proof reinforcing work for an existing building and a reinforcing piece used therefor.

Some existing buildings do not satisfy the current building standards, and there are many that need to increase seismic strength. As techniques for increasing the seismic strength of such existing buildings, there are two methods: a method of adding reinforced concrete walls and a method of adding steel braces.
However, in the method of adding reinforced concrete walls, the opening is covered with the wall surface, so that there is a problem that lighting in the room is affected.
Therefore, when it is desired to open the interior of a building, it is common to perform seismic reinforcement by a method of adding steel braces.

As a method of seismic reinforcement using such a steel brace, methods as shown in Patent Documents 1 to 3 can be cited.
In Patent Document 1, as a method for seismic reinforcement of an opening of an RC structure, a shear panel is suspended from the upper side of a rectangular frame that fits in the opening, and the lower side of the rectangular frame is provided with the shear panel as a vertex. A method is shown in which a brace that forms a hypotenuse of a triangle is provided from the lower side toward the shear panel so that the portion forms a triangular shape that is the base.

Patent Document 2 discloses a method of assembling with a bolt after a unit obtained by dividing a steel frame into a plurality of units is suspended in a building frame at a reinforcement site as a steel frame assembling method.
In addition, in Patent Literature 3, as a steel brace reinforcement method for seismic reinforcement, a steel frame brace attached with a brace that forms a hypotenuse so that the upper side becomes the bottom side of a rectangular frame that fits in the opening is incorporated into the opening. There is shown a method characterized by injecting an adhesive into the contact surface between the frame and the opening and bonding them.
Japanese Patent Publication No. 7-51803 No. 7-26520 Japanese Patent Laid-Open No. 11-71906

However, the prior art has the following problems.
(1) Since a part of the opening is blocked by the steel brace, the scenery from the window may be damaged.
A steel brace that reinforces an existing building is generally configured by inserting a brace so as to form a triangle with respect to the opening. This is because the frame is resistant to deformation by reinforcing it in a triangular shape, but the brace that forms the hypotenuse requires an appropriate thickness.
However, by providing such a steel brace in the opening, the field of view of the opening is blocked by the brace portion that forms the hypotenuse.
Thus, since the reinforcement using the braces forming the hypotenuse does not block the entire opening, the opening is secured, but when looking outside the window from the inside, the brace is damaged by the scenery. Moreover, although it looks strong in appearance, it may be damaged in terms of beauty.

(2) There is a possibility that it takes time and effort to transport and carry in the steel brace.
The size of a steel brace that reinforces an existing building is determined according to the opening. However, the opening in structures that require reinforcement, such as buildings, is often about 6m x 3m or larger, and the steel brace needs to be several meters in size. Is common.
Therefore, the weight of the steel brace itself is increased accordingly, and often has a weight of several tons, so that it is difficult to carry it manually.

For this reason, if a steel frame is manufactured separately to a certain size, then it is brought into the field, connected with bolts, and assembled, it takes a lot of time and special equipment is required, so work efficiency is poor.
Moreover, when attaching a steel brace from the exterior of a building, if it uses a heavy machine, it can be attached comparatively easily, However Depending on a structure, the attachment from the inside may be required. In this case, to bring the steel brace into the building, an opening of the size of the steel brace is required. If there is no entrance, a part of the building is dismantled to secure the entrance. After completion, you need to restore it again.

In addition, when a steel brace is inserted around the opening, if the opening is like an entrance to a building, a step will be created in the floor, which may cause problems such as obstacles to entry and exit or raising the entire floor. It was necessary to complete the construction.
As described above, in the conventional methods of Patent Documents 1 to 3, (1) a part of the opening is blocked and the scenery from the window is damaged, (2) a step is generated in the floor portion of the opening, and the like. There was a problem.

  Therefore, the present invention has been made to solve such a problem, and the seismic reinforcement method for reinforcing the pillars of the existing building without greatly affecting the opening and the indoor space of the existing building and An object is to provide a reinforcing piece.

In order to achieve the object, the seismic reinforcement method and the reinforcing piece according to the present invention have the following characteristics.
(1) In a seismic retrofitting method for seismic reinforcement of a column beam frame composed of columns and beams of an existing building, in particular, the column is arranged between the openings of the column beam frame, one end of the column The column beam frame is held by a reinforcing unit that is in contact with the upper surface of the beam and the other end is in contact with the lower surface of the beam, and is filled with a bonding agent between the column beam frame and the reinforcing unit. The reinforcing unit is integrated.
(2) In the seismic strengthening method for seismic reinforcement of a pillar beam frame composed of pillars and beams of an existing building, in particular, the pillar is arranged between the openings of the pillar beam frame with one end thereof The column beam frame and the reinforcement are filled with a bonding agent between the column beam frame and the reinforcement unit. The unit is integrated.
Therefore, the pillars are held by the reinforcement unit, so the reinforcement unit is small, cheap, lightweight and can be easily carried into the indoor space, no modification of the indoor space is required, and construction is completed in a short period of time. can do.
Further, it is possible to minimize the influence on the opening of the column beam frame, and to reinforce not only the outer pillars but also the indoor pillars while minimizing the influence on the indoor space.

(3) In the seismic reinforcement method described in (2), the reinforcing unit includes an I-type reinforcing piece including a bottom member that abuts on an upper surface or a lower surface of the beam and a vertical member that rises at a right angle from the bottom member. The I-shaped reinforcing piece is inserted between the upper and lower beams so that the free ends are connected to each other.
Therefore, by adopting a method of assembling the reinforcement unit by combining the reinforcement pieces, the reinforcement unit can be downsized and its portability can be improved.
In addition, since the reinforcing unit is arranged so as to sandwich the side surface of the existing column, the structure is effective for the type of the floor type, and there is no step in the floor portion. Moreover, it can respond not only to the outdoors but also to the reinforcement of indoor pillars.

(4) In the seismic reinforcement method described in (2), the reinforcement unit is configured such that one side of the L-shaped reinforcement piece composed of two orthogonal sides comes into contact with the upper surface or the lower surface of the beam, It is characterized by being inserted between the upper and lower beams so that the tips are connected.
Therefore, since the contact area between one side of the L-shaped reinforcing piece and the upper or lower surface of the beam is large, not only the reinforcement of the existing column but also the corner of the opening of the column beam frame can be reinforced, and it can be reinforced at low cost. .

(5) In the seismic reinforcement method according to any one of (3) and (4), the I-type reinforcement piece or the L-type reinforcement piece is joined to the other I-type reinforcement piece or the L-type reinforcement piece. The joint portion comprises a bolt fastening side in which a bolt fastening hole is provided at the tip of the I-type reinforcing piece or the L-type reinforcing piece, and a plate in which a bolt insertion hole is provided, The I-type reinforcement pieces or the L-type reinforcement pieces are integrated as the reinforcement unit by applying the plate to the I-type reinforcement piece or the L-type reinforcement piece having a bolt fastening side and fastening with the bolts. It is characterized by that.

Therefore, the reinforcement piece is provided with a bolt fastening side joint, and the plate is fastened with an assigned bolt to form an integrated reinforcement unit. Thus, the necessary strength can be obtained when it is disposed on the column beam frame.
In addition, a method of measuring the size of an opening to be reinforced in an existing building in advance, producing a reinforcing piece that can constitute a reinforcing unit matched to the size at a factory, and carrying the reinforcing piece to the site. By adopting it, the transportation cost can be reduced as compared with the case of transporting the integral reinforcing unit.
Furthermore, when carrying in an existing building, it is difficult to be restricted by the opening, so there is a possibility that a dedicated carry-in entrance may not be required.

(6) In the earthquake-proof reinforcement method described in any one of (1) to (5), the thickness of the reinforcing unit is made thinner than the thickness of the pillar and the beam of the existing building. Features.
As a result, the reinforcement units attached to the plurality of column beam frames are in a state in which the columns are sandwiched between the adjacent reinforcement units. Therefore, in the portion sandwiched between the column reinforcement units, more than the simple addition of the columns and the reinforcement units. An effect will be obtained. For example, if there are adjacent units vertically and horizontally, the effect can be expected to be further enhanced.

(7) It is a reinforcement piece used for the earthquake-proof reinforcement method described in any one of (1) to (6).
Therefore, it is possible to configure an inexpensive reinforcement unit that is small in size and has good portability and can provide the required strength.

The following functions and effects can be obtained by the seismic reinforcement method and the reinforcing piece according to the present invention having such characteristics.
(1) Since the reinforcing unit is configured in an I shape or an L shape so as to sandwich the existing pillars, the number of openings can be reduced, and the appearance can be reinforced without greatly changing. The influence on the indoor space can be minimized. Further, the opening can be made larger than the reinforcement by the square frame-shaped or portal-shaped reinforcement unit.
(2) Reinforcement unit (precast member by combination of fiber concrete and steel frame) compared with reinforcement by square frame or portal type reinforcement unit by configuring reinforcement unit in I shape or L shape Therefore, the noise during construction and the construction period can be shortened, and earthquake-proof reinforcement can be performed at a low cost.

(3) The existing pillars in the room can be reinforced in particular from four sides by the I-shaped or L-shaped reinforcing unit. can get.
(4) Existing column beam frame and I-shaped or L-shaped reinforcing unit are joined by epoxy resin, so noise and vibration during construction compared to conventional anchor and stud joining , Less dust.

Next, an embodiment of the seismic reinforcement method and the reinforcing piece according to the present invention will be described with reference to the drawings.
Here, FIG. 1 is a schematic front view in which a reinforcement unit is constructed on an existing column beam frame, and FIG. 2 is an enlarged front view in which a reinforcement unit is constructed.

First, the configuration of the first embodiment will be described. As shown in FIGS. 1 and 2, the reinforcing unit 10 includes a bottom member 21 that comes into contact with the upper surface or the lower surface of the beam 151 of the existing column beam frame 15, a vertical member 22 that rises at a right angle from the bottom member 21, The I-type reinforcement piece 20 made of concrete I covering the vertical member 22 and the other I-type reinforcement piece 20 arranged symmetrically with the I-type reinforcement piece 20 in the vertical direction. By joining up and down so that the free ends are connected to each other and filling the opening inner surface 15a of the pillar 152 disposed between the openings of the column beam frame 15 with the bonding agent 50, It is a reinforcing member in which concrete is wound around a steel frame, which is configured in an I shape.
In addition, although the reinforcement unit 10 can also use what is comprised integrally, without dividing into 2 parts up and down, in a present Example, it demonstrates as what was divided into 2 parts.

As shown in FIGS. 3 and 4, the I-shaped reinforcing piece 20 includes a flat bottom member 21, and a vertical member 22 made of H-shaped steel welded so as to rise perpendicularly to the upper surface of the bottom member 21. It is so-called steel concrete composed of concrete 23 formed in a prismatic shape so as to bury the vertical member 22.
The concrete 23 wound around the vertical member 22 made of H-shaped steel may be used for general SRC (Steel Reinforced Concrete) construction or may be a fiber reinforced concrete. The upper end of the concrete 23 is exposed from the other end of the vertical member 22 opposite to the bottom member 21 as shown in FIG.

Bolt insertion holes for fixing the I-type reinforcing piece 20 to the beam 151 or the pillar 152 with the bolt 25 are provided in the bottom member 21 and the portion (joint portion) exposed from the concrete 23 of the vertical member 22.
Moreover, the front-end | tip part exposed from the concrete 23 of the vertical member 22 of both I type reinforcement pieces 20 is provided with the some bolt fastening hole 22b, and is a bolt fastening side. On the other hand, a plate 22a provided with a bolt insertion hole for fastening both the bolt fastening sides is separately prepared.

Next, the construction method of the reinforcement unit 10 of this 1st Embodiment is demonstrated. First, the vertical direction of the corresponding opening of an existing building to be seismically reinforced is measured, the size of the reinforcing unit 10 is determined, and the I-type reinforcing pieces 20 and 20 are manufactured at the factory.
That is, the bottom member 21 is welded to the vertical member 22, the steel material processed by drilling the bolt fastening holes 22b is placed in the mold, and the concrete 23 is poured into the mold to be solidified. The I-shaped reinforcing piece 20 is obtained from the frame.
In addition, the I-type reinforcement pieces 20 and 20 may be manufactured in advance if there is a possibility that they are frequently used with the same dimensions.

The necessary number of completed I-shaped reinforcement pieces 20 and 20 are carried into the existing building, and the adhesive 50 is injected into the opening inner surface 15a of the pillar 152 at the site, and the I-type reinforcement pieces 20 and 20 are bolted at the upper and lower portions. 25, the plate 22a is attached to the bolt fastening side of both I-shaped reinforcing pieces 20, and a high tension bolt is connected and fastened from the bolt insertion hole to the bolt fastening hole 22b.
As a method of connecting the I-type reinforcement pieces 20 and 20, welding or adhesion may be considered, and such a joining method is not denied. However, if the purpose of seismic reinforcement is assumed, the reinforcement unit 10 is It is preferable to join them mechanically. When welding or the like is performed, a welding machine or a power source is required locally, and there is a problem such as extra costs. Therefore, it is more advantageous to be able to easily perform the fastening with bolts or the like.

FIG. 5 shows a detailed view of a portion B which is a joint portion of the I-type reinforcing piece 20 shown in FIG. As described above, the joint portion of the I-shaped reinforcing pieces 20 and 20 is fastened by applying the plate 22a to the tip of the vertical member 22 and inserting the high-tensile bolt into the bolt insertion hole and the bolt fastening hole 22b.
And the part of the fiber reinforced concrete additional part 18 exposed from the concrete 23 of the I type reinforcement pieces 20 and 20 is formed. That is, the periphery of the fiber reinforced concrete additional portion 18 may be covered with a mold, and the fiber reinforced concrete may be poured and cured therein. The portion of the fiber reinforced concrete additional portion 18 may be composed of non-shrink mortar, but in this embodiment, a tough grout is used.

When the pillar 152 constitutes a corner of an existing building, the reinforcing unit 10 is attached to the adjacent opening inner surface 15a of the pillar 152 to reinforce the pillar 152 as shown in FIG. To do.
Although not shown, when the pillar 152 exists in the indoor space, the pillar 152 can be reinforced by attaching the reinforcing unit 10 to the four opening inner surfaces 15 a of the pillar 152.

Since this first embodiment has the above-described configuration and adopts the above construction method, the following effects can be expected.
First, since the reinforcing unit 10 is attached to the pillar 152 of the existing building and the pillar 152 is reinforced, the reinforcing unit is not only provided in the opening of the column beam frame on the outer periphery of the existing building, but in the four sides of the pillars arranged indoors. Can be attached to reinforce this pillar.
At this time, the interior space is not partitioned or the height of the space is not reduced, and the seismic reinforcement can be efficiently performed without greatly affecting the usability of the interior space.

Further, since the reinforcing unit 10 is small, it is possible to perform seismic reinforcement while minimizing the influence on the opening and appearance of the existing building.
In addition, by dividing the reduced reinforcing unit 10 into units of the I-shaped reinforcing piece 20, a member having a weight of several tons can reduce the weight to the level of two hundred kilograms. It is effective for improvement.
If the weight of the I-shaped reinforcing piece 20 is in the range of 200 kilograms, it can be easily carried in manually and can be easily ridden on a cart or the like, so that portability is improved. Furthermore, since it can be sized to fit into the elevator, there is an advantage that it is not necessary to provide a carry-in entrance in order to carry in the reinforcing unit 10.

If it is this size, the entrance / exit provided in the existing building can be used, and there are also cases where an opening for carrying in large equipment is usually provided. Can be considered almost irrelevant.
In addition, when the length of the passage is required to be transported, the number of cases that can be limited is considered to be reduced.

Furthermore, since it can be easily assembled with bolts or the like, it is not necessary to arrange an operator with special skills. For example, when welding is necessary, it is necessary that an operator with welding technology needs to be present at the site, and there are various problems such as securing a power source for welding, which is not necessary.
In addition, assembly in a short time is possible, and there is an effect of shortening the construction time. Since the plate 22a is attached to the bolt fastening hole 22b provided in the vertical member 22 of the reinforcing unit 10 and tightened, there is no fear of lack of strength, and in the reinforcement at the time of earthquake, particularly force is applied to the joint portion of the column and the beam. However, since the I-shaped reinforcing piece 20 is fixed to the beam 151 by the bottom member 21, both the beam 151 and the column 152 are reinforced, so there is no shortage in strength.

Further, in terms of structural strength, the structure in which the braces are provided and the case where the steel brace having a truss shape is provided are stronger. Therefore, the thickness of the frame of the I-type reinforcing piece 20 is There is a possibility of becoming thicker.
However, the case where the frame of the reinforcing unit 10 is somewhat thicker than the case where the reinforcing member crosses the opening diagonally does not give a sense of pressure, resulting in a view from the window. It is hard to damage. In addition, even when the reinforcement unit 10 is constructed outside the existing building, it is difficult to understand if it is seismically reinforced, even when it is constructed inside, rather than in the case of a brace or truss shape. There is no risk of damage.

According to the seismic reinforcement method and the reinforcing piece of Example 1 described above, the following excellent actions and effects can be obtained.
That is, in the seismic reinforcement method for seismically reinforcing the column beam frame 15 composed of the columns 152 and the beams 151 of the existing building, the side surface on the opening side of the columns 152 arranged between the openings of the column beam frame 15. 15a includes a bottom member 21 that comes into contact with the upper surface or the lower surface of the beam 151, a vertical member 22 that rises perpendicularly from the bottom member 21, and a concrete 23 that is formed in a prismatic shape so as to bury the vertical member 22. Since the I-type reinforcing piece 20 is sandwiched between the upper and lower beams 151 so as to be connected to each other so that the free ends of the I-shaped reinforcing pieces 20 are integrated, the opening side of the column beam frame By adopting a method of assembling the reinforcement unit by combining the reinforcement pieces on the side of the pillar, the reinforcement unit is downsized and has an effect on the exterior of the existing building and the interior space. Lost and be earthquake-proof reinforcement, and can increase the portability of the reinforcing unit.

Next, the configuration of the second embodiment will be described. In the second embodiment, the configuration of the reinforcing unit is changed to an L-shaped reinforcing piece, and the method of installing the reinforcing unit in an existing building is changed. Therefore, only this change part is demonstrated.
As shown in FIG. 7, the reinforcing unit 110 has one side of an L-shaped reinforcing piece 30 composed of two orthogonal sides abutting against the upper surface or the lower surface of the beam 151 of the existing column beam frame 15, and the other side being The columns 152 arranged between the openings of the column beam frame 15 are connected to the opening inner surface 15a by filling the bonding agent 50, and the upper ends of the L-shaped reinforcing pieces 30 and 30 are connected to each other so that the free ends thereof are connected to each other. It is a reinforcing member that is inserted between the beams 151 and 151 and has a U-shaped configuration, in which concrete is wound around a steel frame.

  The L-shaped reinforcing piece 30 is a so-called steel concrete composed of a concrete 33 formed by joining H-shaped steel members 31 and 32 at a right angle and forming a prismatic shape so as to fill the H-shaped steel members 31 and 32. is there. The material of the concrete 33 wound around the H-shaped steel members 31 and 32 is the same as that of the first embodiment. And the edge part of the H-section steel member 31 of the side contact | abutted to the pillar 152 is exposed from the concrete 33, and forms the junction part.

And the bolt hole for fixing the H-shaped steel members 31 and 32 to the beam 151 and the pillar 152 with the volt | bolt 25 is provided in the required position of the H-shaped steel members 31 and 32.
In addition, a bolt fastening hole 22b is formed at the end of the H-shaped steel member 31 on the side in contact with one of the pillars 152 in the same manner as in the first embodiment, and a bolt insertion hole is provided in this end. The applied plate 22a is applied, and a high tension bolt is inserted and connected from the bolt insertion hole to the bolt fastening hole 22b.

Since the construction method of the reinforcing unit 110 configured as described above is substantially the same as that of the first embodiment, the description thereof is omitted.
According to the seismic reinforcement method and the reinforcing piece using the reinforcing unit 110 of the second embodiment, the following excellent actions and effects can be obtained.
That is, in the seismic strengthening method for seismic reinforcement of the pillar beam frame 15 composed of the pillar 152 and the beam 151 of the existing building, particularly the pillar, the opening of the pillar 152 disposed between the openings of the pillar beam frame 15. The side surface 15a on the part side is filled with an H-shaped steel member 31 that comes into contact with the upper or lower surface of the beam 151, an H-shaped steel member 32 that rises perpendicularly from the H-shaped steel member 31, and the H-shaped steel members 31 and 32. The L-shaped reinforcing piece 30 made of concrete 33 formed in a prismatic shape so as to be wound is sandwiched between the upper and lower beams 151 so that the free ends of the L-shaped reinforcing pieces 30 are connected to each other. Since the contact area with the beam 151 can be made larger than the contact area of the first embodiment, in addition to the effects of the first embodiment, the corner portions of the beam 151 and the pillar 152 are further reinforced. Can .

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, the concrete used for the reinforcing units 10 and 110 does not prevent the use of a member such as a high-toughness fiber-reinforced cement composite material mixed with high-strength fibers. Furthermore, you may comprise only a steel frame or a lightweight steel frame, without winding with concrete.
Moreover, although the division | segmentation number of the reinforcement unit 10 is set to 2 in the present Example, it does not prevent dividing a straight line part into 3 divisions or 4 divisions.

In addition, as for the bonding agent 50 filled between the reinforcing units 10 and 110 and the column beam frame 15, an adhesion method using an epoxy resin is given as an example, but for this construction method, for example, non-shrink mortar is filled. And does not prevent fixing.
In this case, the management of the clearance between the reinforcing units 10 and 110 and the column beam frame 15 becomes a problem. For example, by inserting a non-shrink mortar plate, inserting a steel material or a mesh material, the clearance is managed and bonded. It is considered that the strength can be secured by using the agent.
Moreover, the combination of the joining part in the said Example 1 and Example 2, and the assembly order of a reinforcement piece is not limited to the said embodiment.

It is the schematic front view which constructed the reinforcement unit in the existing column beam frame of Example 1. FIG. It is the enlarged front view which constructed the reinforcement unit of Example 1. FIG. It is sectional drawing which follows the AA line shown in FIG. It is a schematic front view of the reinforcement piece which comprises the reinforcement unit of Example 1. FIG. It is detail drawing of the B section which is a junction part of the reinforcement pieces shown in FIG. It is sectional drawing in the case of constructing a reinforcement unit in the existing building which has the existing pillar in a corner | angular part of Example 1. FIG. It is sectional drawing which constructed the reinforcement unit in the existing column beam frame of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 110 Reinforcement unit 15 Column beam frame 15a Opening inner surface 151 Existing beam 152 Existing column 18 Non-shrink mortar addition part 20 I type reinforcement piece 21 Bottom member 22 Vertical member 22a Plate 22b Bolt fastening hole 23 Concrete 30 L type reinforcement piece 31 32 H-shaped steel member 33 Concrete 42 Vertical member 50 Bonding agent

  The present invention relates to a reinforcing method in an earthquake-proof reinforcing work for an existing building and a reinforcing piece used therefor.

Some existing buildings do not satisfy the current building standards, and there are many that need to increase seismic strength. As techniques for increasing the seismic strength of such existing buildings, there are two methods: a method of adding reinforced concrete walls and a method of adding steel braces.
However, in the method of adding reinforced concrete walls, the opening is covered with the wall surface, so that there is a problem that lighting in the room is affected.
Therefore, when it is desired to open the interior of a building, it is common to perform seismic reinforcement by a method of adding steel braces.

As a method of seismic reinforcement using such a steel brace, methods as shown in Patent Documents 1 to 3 can be cited.
In Patent Document 1, as a method for seismic reinforcement of an opening of an RC structure, a shear panel is suspended from the upper side of a rectangular frame that fits in the opening, and the lower side of the rectangular frame is provided with the shear panel as a vertex. A method is shown in which a brace that forms a hypotenuse of a triangle is provided from the lower side toward the shear panel so that the portion forms a triangular shape that is the base.

Patent Document 2 discloses a method of assembling with a bolt after a unit obtained by dividing a steel frame into a plurality of units is suspended in a building frame at a reinforcement site as a steel frame assembling method.
In addition, in Patent Literature 3, as a steel brace reinforcement method for seismic reinforcement, a steel frame brace attached with a brace that forms a hypotenuse so that the upper side becomes the bottom side of a rectangular frame that fits in the opening is incorporated into the opening. There is shown a method characterized by injecting an adhesive into the contact surface between the frame and the opening and bonding them.
Japanese Patent Publication No. 7-51803 No. 7-26520 Japanese Patent Laid-Open No. 11-71906

However, the prior art has the following problems.
(1) Since a part of the opening is blocked by the steel brace, the scenery from the window may be damaged.
A steel brace that reinforces an existing building is generally configured by inserting a brace so as to form a triangle with respect to the opening. This is because the frame is resistant to deformation by reinforcing it in a triangular shape, but the brace that forms the hypotenuse requires an appropriate thickness.
However, by providing such a steel brace in the opening, the field of view of the opening is blocked by the brace portion that forms the hypotenuse.
Thus, since the reinforcement using the braces forming the hypotenuse does not block the entire opening, the opening is secured, but when looking outside the window from the inside, the brace is damaged by the scenery. Moreover, although it looks strong in appearance, it may be damaged in terms of beauty.

(2) There is a possibility that it takes time and effort to transport and carry in the steel brace.
The size of a steel brace that reinforces an existing building is determined according to the opening. However, the opening in structures that require reinforcement, such as buildings, is often about 6m x 3m or larger, and the steel brace needs to be several meters in size. Is common.
Therefore, the weight of the steel brace itself is increased accordingly, and often has a weight of several tons, so that it is difficult to carry it manually.

For this reason, if a steel frame is manufactured separately to a certain size, then it is brought into the field, connected with bolts, and assembled, it takes a lot of time and special equipment is required, so work efficiency is poor.
Moreover, when attaching a steel brace from the exterior of a building, if it uses a heavy machine, it can be attached comparatively easily, However Depending on a structure, the attachment from the inside may be required. In this case, to bring the steel brace into the building, an opening of the size of the steel brace is required. If there is no entrance, a part of the building is dismantled to secure the entrance. After completion, you need to restore it again.

In addition, when a steel brace is inserted around the opening, if the opening is like an entrance to a building, a step will be created in the floor, which may cause problems such as obstacles to entry and exit or raising the entire floor. It was necessary to complete the construction.
As described above, in the conventional methods of Patent Documents 1 to 3, (1) a part of the opening is blocked and the scenery from the window is damaged, (2) a step is generated in the floor portion of the opening, and the like. There was a problem.

  Therefore, the present invention has been made to solve such a problem, and the seismic reinforcement method for reinforcing the pillars of the existing building without greatly affecting the opening and the indoor space of the existing building and An object is to provide a reinforcing piece.

In order to achieve the object, the seismic reinforcement method and the reinforcing piece according to the present invention have the following characteristics.
(1) In the seismic strengthening method of a column beam frame composed of columns and beams of an existing building, in particular, the columns are seismically strengthened with a reinforcing unit , the reinforcing unit winds concrete around the steel material using steel as a bone. The side surface of the column arranged between the openings of the column beam frame is in contact with the upper surface of the lower beam. , sandwiched by two reinforcing units other end abuts against the lower surface of the upper beam, between the reinforcing unit and said post, by filling a bonding agent, to integrate the reinforcing unit and said post It is characterized by that.
(2) In the seismic reinforcement method of the column beam frame composed of columns and beams of an existing building, in particular, the column is seismically reinforced with the reinforcement unit , the reinforcement unit connects two reinforcement pieces to each other at the ends. Each reinforcing piece is formed by winding concrete around steel and using steel as a bone, inside the existing building , and opening the column beam frame. the side pillars are located between the parts, one end is sandwiched by two reinforcing units other end to the upper surface abutting the lower beam is brought into contact with the lower surface of the upper beam, and the reinforcing unit and said post The column and the reinforcing unit are integrated by filling a bonding agent between them.
Therefore, the pillars are held by the reinforcement unit, so the reinforcement unit is small, cheap, lightweight and can be easily carried into the indoor space, no modification of the indoor space is required, and construction is completed in a short period of time. can do.
Further, it is possible to minimize the influence on the opening of the column beam frame, and to reinforce not only the outer pillars but also the indoor pillars while minimizing the influence on the indoor space.

(3) In Seismic Retrofit described in (2), the reinforcing unit includes abutting the bottom member to the lower surface of the upper surface or the upper beam of the lower beam, vertical members which rises perpendicularly from the bottom member The two I-shaped reinforcing pieces are inserted between the lower beam and the upper beam so that the free ends of the I-shaped reinforcing pieces are connected to each other.
Therefore, by adopting a method of assembling the reinforcement unit by combining the reinforcement pieces, the reinforcement unit can be downsized and its portability can be improved.
In addition, since the reinforcing unit is arranged so as to sandwich the side surface of the existing column, the structure is effective for the type of the floor type, and there is no step in the floor portion. Moreover, it can respond not only to the outdoors but also to the reinforcement of indoor pillars.

(4) In Seismic Retrofit described in (2), the reinforcing unit includes two L-shaped reinforcing piece consists of two orthogonal sides, the two L-shaped reinforcing piece, one side the lower It is in contact with the upper surface of the side beam or the lower surface of the upper beam, and is inserted between the lower beam and the upper beam so that the tips of the other side are connected to each other. .
Therefore, since the contact area between one side of the L-shaped reinforcing piece and the upper or lower surface of the beam is large, not only the reinforcement of the existing column but also the corner of the opening of the column beam frame can be reinforced, and it can be reinforced at low cost. .

(5) In the seismic reinforcement method according to any one of (3) and (4), the I-type reinforcement piece or the L-type reinforcement piece is joined to the other I-type reinforcement piece or the L-type reinforcement piece. The joint portion comprises a bolt fastening side in which a bolt fastening hole is provided at the tip of the I-type reinforcing piece or the L-type reinforcing piece, and a plate in which a bolt insertion hole is provided, The I-type reinforcement pieces or the L-type reinforcement pieces are integrated as the reinforcement unit by applying the plate to the I-type reinforcement piece or the L-type reinforcement piece having a bolt fastening side and fastening with the bolts. It is characterized by that.

Therefore, the reinforcement piece is provided with a bolt fastening side joint, and the plate is fastened with an assigned bolt to form an integrated reinforcement unit. Thus, the necessary strength can be obtained when it is disposed on the column beam frame.
In addition, a method of measuring the size of an opening to be reinforced in an existing building in advance, producing a reinforcing piece that can constitute a reinforcing unit matched to the size at a factory, and carrying the reinforcing piece to the site. By adopting it, the transportation cost can be reduced as compared with the case of transporting the integral reinforcing unit.
Furthermore, when carrying in an existing building, it is difficult to be restricted by the opening, so there is a possibility that a dedicated carry-in entrance may not be required.

(6) In the earthquake-proof reinforcement method described in any one of (1) to (5), the thickness of the reinforcing unit is made thinner than the thickness of the pillar and the beam of the existing building. Features.
As a result, the reinforcement units attached to the plurality of column beam frames are in a state in which the columns are sandwiched between the adjacent reinforcement units. Therefore, in the portion sandwiched between the column reinforcement units, more than the simple addition of the columns and the reinforcement units. An effect will be obtained. For example, if there are adjacent units vertically and horizontally, the effect can be expected to be further enhanced.

(7) It is a reinforcement piece used for the earthquake-proof reinforcement method described in any one of (1) to (6).
Therefore, it is possible to configure an inexpensive reinforcement unit that is small in size and has good portability and can provide the required strength.

The following functions and effects can be obtained by the seismic reinforcement method and the reinforcing piece according to the present invention having such characteristics.
(1) Since the reinforcing unit is configured in an I shape or an L shape so as to sandwich the existing pillars, the number of openings can be reduced, and the appearance can be reinforced without greatly changing. The influence on the indoor space can be minimized. Further, the opening can be made larger than the reinforcement by the square frame-shaped or portal-shaped reinforcement unit.
(2) Reinforcement unit (precast member by combination of fiber concrete and steel frame) compared with reinforcement by square frame or portal type reinforcement unit by configuring reinforcement unit in I shape or L shape Therefore, the noise during construction and the construction period can be shortened, and earthquake-proof reinforcement can be performed at a low cost.

(3) The existing pillars in the room can be reinforced in particular from four sides by the I-shaped or L-shaped reinforcing unit. can get.
(4) Existing column beam frame and I-shaped or L-shaped reinforcing unit are joined by epoxy resin, so noise and vibration during construction compared to conventional anchor and stud joining , Less dust.

Next, an embodiment of the seismic reinforcement method and the reinforcing piece according to the present invention will be described with reference to the drawings.
Here, FIG. 1 is a schematic front view in which a reinforcement unit is constructed on an existing column beam frame, and FIG. 2 is an enlarged front view in which a reinforcement unit is constructed.

First, the configuration of the first embodiment will be described. As shown in FIGS. 1 and 2, the reinforcing unit 10 includes a bottom member 21 that comes into contact with the upper surface or the lower surface of the beam 151 of the existing column beam frame 15, a vertical member 22 that rises at a right angle from the bottom member 21, The I-type reinforcement piece 20 made of concrete I covering the vertical member 22 and the other I-type reinforcement piece 20 arranged symmetrically with the I-type reinforcement piece 20 in the vertical direction. By joining up and down so that the free ends are connected to each other and filling the opening inner surface 15a of the pillar 152 disposed between the openings of the column beam frame 15 with the bonding agent 50, It is a reinforcing member in which concrete is wound around a steel frame, which is configured in an I shape.
In addition, although the reinforcement unit 10 can also use what is comprised integrally, without dividing into 2 parts up and down, in a present Example, it demonstrates as what was divided into 2 parts.

As shown in FIGS. 3 and 4, the I-shaped reinforcing piece 20 includes a flat bottom member 21, and a vertical member 22 made of H-shaped steel welded so as to rise perpendicularly to the upper surface of the bottom member 21. It is so-called steel concrete composed of concrete 23 formed in a prismatic shape so as to bury the vertical member 22.
The concrete 23 wound around the vertical member 22 made of H-shaped steel may be used for general SRC (Steel Reinforced Concrete) construction or may be a fiber reinforced concrete. The upper end of the concrete 23 is exposed from the other end of the vertical member 22 opposite to the bottom member 21 as shown in FIG.

Bolt insertion holes for fixing the I-type reinforcing piece 20 to the beam 151 or the pillar 152 with the bolt 25 are provided in the bottom member 21 and the portion (joint portion) exposed from the concrete 23 of the vertical member 22.
Moreover, the front-end | tip part exposed from the concrete 23 of the vertical member 22 of both I type reinforcement pieces 20 is provided with the some bolt fastening hole 22b, and is a bolt fastening side. On the other hand, a plate 22a provided with a bolt insertion hole for fastening both the bolt fastening sides is separately prepared.

Next, the construction method of the reinforcement unit 10 of this 1st Embodiment is demonstrated. First, the vertical direction of the corresponding opening of an existing building to be seismically reinforced is measured, the size of the reinforcing unit 10 is determined, and the I-type reinforcing pieces 20 and 20 are manufactured at the factory.
That is, the bottom member 21 is welded to the vertical member 22, the steel material processed by drilling the bolt fastening holes 22b is placed in the mold, and the concrete 23 is poured into the mold to be solidified. The I-shaped reinforcing piece 20 is obtained from the frame.
In addition, the I-type reinforcement pieces 20 and 20 may be manufactured in advance if there is a possibility that they are frequently used with the same dimensions.

The necessary number of completed I-shaped reinforcement pieces 20 and 20 are carried into the existing building, and the adhesive 50 is injected into the opening inner surface 15a of the pillar 152 at the site, and the I-type reinforcement pieces 20 and 20 are bolted at the upper and lower portions. 25, the plate 22a is attached to the bolt fastening side of both I-shaped reinforcing pieces 20, and a high tension bolt is connected and fastened from the bolt insertion hole to the bolt fastening hole 22b.
As a method of connecting the I-type reinforcement pieces 20 and 20, welding or adhesion may be considered, and such a joining method is not denied. However, if the purpose of seismic reinforcement is assumed, the reinforcement unit 10 is It is preferable to join them mechanically. When welding or the like is performed, a welding machine or a power source is required locally, and there is a problem such as extra costs. Therefore, it is more advantageous to be able to easily perform the fastening with bolts or the like.

FIG. 5 shows a detailed view of a portion B which is a joint portion of the I-type reinforcing piece 20 shown in FIG. As described above, the joint portion of the I-shaped reinforcing pieces 20 and 20 is fastened by applying the plate 22a to the tip of the vertical member 22 and inserting the high-tensile bolt into the bolt insertion hole and the bolt fastening hole 22b.
And the part of the fiber reinforced concrete additional part 18 exposed from the concrete 23 of the I type reinforcement pieces 20 and 20 is formed. That is, the periphery of the fiber reinforced concrete additional portion 18 may be covered with a mold, and the fiber reinforced concrete may be poured and cured therein. The portion of the fiber reinforced concrete additional portion 18 may be composed of non-shrink mortar, but in this embodiment, a tough grout is used.

When the pillar 152 constitutes a corner of an existing building, the reinforcing unit 10 is attached to the adjacent opening inner surface 15a of the pillar 152 to reinforce the pillar 152 as shown in FIG. To do.
Although not shown, when the pillar 152 exists in the indoor space, the pillar 152 can be reinforced by attaching the reinforcing unit 10 to the four opening inner surfaces 15 a of the pillar 152.

Since this first embodiment has the above-described configuration and adopts the above construction method, the following effects can be expected.
First, since the reinforcing unit 10 is attached to the pillar 152 of the existing building and the pillar 152 is reinforced, the reinforcing unit is not only provided in the opening of the column beam frame on the outer periphery of the existing building, but in the four sides of the pillars arranged indoors. Can be attached to reinforce this pillar.
At this time, the interior space is not partitioned or the height of the space is not reduced, and the seismic reinforcement can be efficiently performed without greatly affecting the usability of the interior space.

Further, since the reinforcing unit 10 is small, it is possible to perform seismic reinforcement while minimizing the influence on the opening and appearance of the existing building.
In addition, by dividing the reduced reinforcing unit 10 into units of the I-shaped reinforcing piece 20, a member having a weight of several tons can reduce the weight to the level of two hundred kilograms. It is effective for improvement.
If the weight of the I-shaped reinforcing piece 20 is in the range of 200 kilograms, it can be easily carried in manually and can be easily ridden on a cart or the like, so that portability is improved. Furthermore, since it can be sized to fit into the elevator, there is an advantage that it is not necessary to provide a carry-in entrance in order to carry in the reinforcing unit 10.

If it is this size, the entrance / exit provided in the existing building can be used, and there are also cases where an opening for carrying in large equipment is usually provided. Can be considered almost irrelevant.
In addition, when the length of the passage is required to be transported, the number of cases that can be limited is considered to be reduced.

Furthermore, since it can be easily assembled with bolts or the like, it is not necessary to arrange an operator with special skills. For example, when welding is necessary, it is necessary that an operator with welding technology needs to be present at the site, and there are various problems such as securing a power source for welding, which is not necessary.
In addition, assembly in a short time is possible, and there is an effect of shortening the construction time. Since the plate 22a is attached to the bolt fastening hole 22b provided in the vertical member 22 of the reinforcing unit 10 and tightened, there is no fear of lack of strength, and in the reinforcement at the time of earthquake, particularly force is applied to the joint portion of the column and the beam. However, since the I-shaped reinforcing piece 20 is fixed to the beam 151 by the bottom member 21, both the beam 151 and the column 152 are reinforced, so there is no shortage in strength.

Further, in terms of structural strength, the structure in which the braces are provided and the case where the steel brace having a truss shape is provided are stronger. Therefore, the thickness of the frame of the I-type reinforcing piece 20 is There is a possibility of becoming thicker.
However, the case where the frame of the reinforcing unit 10 is somewhat thicker than the case where the reinforcing member crosses the opening diagonally does not give a sense of pressure, resulting in a view from the window. It is hard to damage. In addition, even when the reinforcement unit 10 is constructed outside the existing building, it is difficult to understand if it is seismically reinforced, even when it is constructed inside, rather than in the case of a brace or truss shape. There is no risk of damage.

According to the seismic reinforcement method and the reinforcing piece of Example 1 described above, the following excellent actions and effects can be obtained.
That is, in the seismic reinforcement method for seismically reinforcing the column beam frame 15 composed of the columns 152 and the beams 151 of the existing building, the side surface on the opening side of the columns 152 arranged between the openings of the column beam frame 15. 15a includes a bottom member 21 that comes into contact with the upper surface or the lower surface of the beam 151, a vertical member 22 that rises perpendicularly from the bottom member 21, and a concrete 23 that is formed in a prismatic shape so as to bury the vertical member 22. Since the I-type reinforcing piece 20 is sandwiched between the upper and lower beams 151 so as to be connected to each other so that the free ends of the I-shaped reinforcing pieces 20 are integrated, the opening side of the column beam frame By adopting a method of assembling the reinforcement unit by combining the reinforcement pieces on the side of the pillar, the reinforcement unit is downsized and has an effect on the exterior of the existing building and the interior space. Lost and be earthquake-proof reinforcement, and can increase the portability of the reinforcing unit.

Next, the configuration of the second embodiment will be described. In the second embodiment, the configuration of the reinforcing unit is changed to an L-shaped reinforcing piece, and the method of installing the reinforcing unit in an existing building is changed. Therefore, only this change part is demonstrated.
As shown in FIG. 7, the reinforcing unit 110 has one side of an L-shaped reinforcing piece 30 composed of two orthogonal sides abutting against the upper surface or the lower surface of the beam 151 of the existing column beam frame 15, and the other side being The columns 152 arranged between the openings of the column beam frame 15 are connected to the opening inner surface 15a by filling the bonding agent 50, and the upper ends of the L-shaped reinforcing pieces 30 and 30 are connected to each other so that the free ends thereof are connected to each other. It is a reinforcing member that is inserted between the beams 151 and 151 and has a U-shaped configuration, in which concrete is wound around a steel frame.

  The L-shaped reinforcing piece 30 is a so-called steel concrete composed of a concrete 33 formed by joining H-shaped steel members 31 and 32 at a right angle and forming a prismatic shape so as to fill the H-shaped steel members 31 and 32. is there. The material of the concrete 33 wound around the H-shaped steel members 31 and 32 is the same as that of the first embodiment. And the edge part of the H-section steel member 31 of the side contact | abutted to the pillar 152 is exposed from the concrete 33, and forms the junction part.

And the bolt hole for fixing the H-shaped steel members 31 and 32 to the beam 151 and the pillar 152 with the volt | bolt 25 is provided in the required position of the H-shaped steel members 31 and 32.
In addition, a bolt fastening hole 22b is formed at the end of the H-shaped steel member 31 on the side in contact with one of the pillars 152 in the same manner as in the first embodiment, and a bolt insertion hole is provided in this end. The applied plate 22a is applied, and a high tension bolt is inserted and connected from the bolt insertion hole to the bolt fastening hole 22b.

Since the construction method of the reinforcing unit 110 configured as described above is substantially the same as that of the first embodiment, the description thereof is omitted.
According to the seismic reinforcement method and the reinforcing piece using the reinforcing unit 110 of the second embodiment, the following excellent actions and effects can be obtained.
That is, in the seismic strengthening method for seismic reinforcement of the pillar beam frame 15 composed of the pillar 152 and the beam 151 of the existing building, particularly the pillar, the opening of the pillar 152 disposed between the openings of the pillar beam frame 15. The side surface 15a on the part side is filled with an H-shaped steel member 31 that comes into contact with the upper or lower surface of the beam 151, an H-shaped steel member 32 that rises perpendicularly from the H-shaped steel member 31, and the H-shaped steel members 31 and 32. The L-shaped reinforcing piece 30 made of concrete 33 formed in a prismatic shape so as to be wound is sandwiched between the upper and lower beams 151 so that the free ends of the L-shaped reinforcing pieces 30 are connected to each other. Since the contact area with the beam 151 can be made larger than the contact area of the first embodiment, in addition to the effects of the first embodiment, the corner portions of the beam 151 and the pillar 152 are further reinforced. Can .

In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, the concrete used for the reinforcing units 10 and 110 does not prevent the use of a member such as a high-toughness fiber-reinforced cement composite material mixed with high-strength fibers. Furthermore, you may comprise only a steel frame or a lightweight steel frame, without winding with concrete.
Moreover, although the division | segmentation number of the reinforcement unit 10 is set to 2 in the present Example, it does not prevent dividing a straight line part into 3 divisions or 4 divisions.

In addition, as for the bonding agent 50 filled between the reinforcing units 10 and 110 and the column beam frame 15, an adhesion method using an epoxy resin is given as an example, but for this construction method, for example, non-shrink mortar is filled. And does not prevent fixing.
In this case, the management of the clearance between the reinforcing units 10 and 110 and the column beam frame 15 becomes a problem. For example, by inserting a non-shrink mortar plate, inserting a steel material or a mesh material, the clearance is managed and bonded. It is considered that the strength can be secured by using the agent.
Moreover, the combination of the joining part in the said Example 1 and Example 2, and the assembly order of a reinforcement piece is not limited to the said embodiment.

It is the schematic front view which constructed the reinforcement unit in the existing column beam frame of Example 1. FIG. It is the enlarged front view which constructed the reinforcement unit of Example 1. FIG. It is sectional drawing which follows the AA line shown in FIG. It is a schematic front view of the reinforcement piece which comprises the reinforcement unit of Example 1. FIG. It is detail drawing of the B section which is a junction part of the reinforcement pieces shown in FIG. It is sectional drawing in the case of constructing a reinforcement unit in the existing building which has the existing pillar in a corner | angular part of Example 1. FIG. It is sectional drawing which constructed the reinforcement unit in the existing column beam frame of Example 2. FIG.

DESCRIPTION OF SYMBOLS 10, 110 Reinforcement unit 15 Column beam frame 15a Opening inner surface 151 Existing beam 152 Existing column 18 Non-shrink mortar addition part 20 I type reinforcement piece 21 Bottom member 22 Vertical member 22a Plate 22b Bolt fastening hole 23 Concrete 30 L type reinforcement piece 31 32 H-shaped steel member 33 Concrete 42 Vertical member 50 Bonding agent

Claims (7)

In the seismic retrofitting method for seismic reinforcement of pillars and beams, which are composed of pillars and beams of existing buildings,
The side surface of the column disposed between the openings of the column beam frame is sandwiched by a reinforcing unit whose one end is in contact with the upper surface of the beam and the other end is in contact with the lower surface of the beam. A seismic strengthening method characterized in that the column beam frame and the reinforcing unit are integrated by filling a bonding agent between the reinforcing unit and the reinforcing unit. In the seismic retrofitting method for seismic reinforcement of pillars and beams, which are composed of pillars and beams of existing buildings,
The side surface of the column arranged between the openings of the column beam frame is sandwiched by a reinforcement unit having one end abutting against the upper surface or the lower surface of the beam and the other end connected to each other, and the column beam frame and the reinforcement unit The column beam frame and the reinforcing unit are integrated by filling a bonding agent between them. In the seismic reinforcement method described in claim 2,
The reinforcing unit includes an I-type reinforcing piece composed of a bottom member that contacts the upper surface or the lower surface of the beam and a vertical member that rises at a right angle from the bottom member, and the free ends of the I-type reinforcing piece are connected to each other. A seismic reinforcement method that is inserted between the upper and lower beams. In the seismic reinforcement method described in claim 2,
The reinforcing unit is inserted between the upper and lower beams so that one side of an L-shaped reinforcing piece composed of two orthogonal sides is in contact with the upper or lower surface of the beam and the tips of the other side are connected to each other. Seismic reinforcement construction method characterized by that. In the seismic reinforcement method according to claim 3 or claim 4,
The I-type reinforcement piece or the L-type reinforcement piece is provided with a joint portion that joins the other I-type reinforcement piece or the L-type reinforcement piece,
The joint portion includes a bolt fastening side in which a bolt fastening hole is provided at a tip of the I-type reinforcing piece or the L-type reinforcing piece, and a plate in which a bolt insertion hole is provided.
The I-type reinforcement pieces or the L-type reinforcement pieces are integrated as the reinforcement unit by applying the plate to the I-type reinforcement piece or the L-type reinforcement piece having a bolt fastening side and fastening with the bolts. Seismic reinforcement construction method characterized by that. In the seismic reinforcement method according to any one of claims 1 to 5,
The seismic reinforcement method, wherein the thickness of the reinforcing unit is thinner than the thickness of the pillar and the beam of the existing building.   A reinforcing piece for use in the seismic reinforcement method according to any one of claims 1 to 6.

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