JP2013076227A - Seismic strengthening method and reinforcing piece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic strengthening method which, when a column-beam frame located between a room and an exterior floor is seismically strengthened with a reinforcing unit in an existing building with an exterior floor circumscribing a building body and projecting, allows entering and exiting between the room and the exterior floor without inconvenience and can suppress construction cost for seismic strengthening, and a reinforcing piece used for the method.SOLUTION: A reinforcing unit 20 is formed with reinforcing pieces 21 made by integrally molding a steel material 22 and a concrete part 23 covering the periphery of the steel material 22. The reinforcing piece 21 has a straight vertical side reinforcing part 21Va disposed in a direction along a height direction of an existing column 11, and the vertical side reinforcing part 21Va of the reinforcing piece 21 is supported by and fixed to a lower slab 3L of an outer wall side column-beam frame 10A.

Description

  The present invention relates to an earthquake-resistant reinforcement method in an earthquake-proof reinforcement work for existing buildings such as buildings and apartment houses, and a reinforcement piece used in this method.

  Among existing buildings such as buildings and apartment houses, there are buildings that are not built to meet the current building structure standards, and such buildings need to be strengthened to increase earthquake resistance. One example of a technique for increasing the seismic strength is the seismic reinforcement method disclosed in Patent Documents 1 to 3.

  In Patent Document 1, in an existing building, among square frame-shaped column beam frames composed of existing columns and existing beams, a plurality of reinforcing pieces are symmetrically formed in a portal frame shape on the inner side surface of the opening. A seismic reinforcement method is described in which a bonded reinforcing unit is inserted and fitted, and the reinforcing unit is fixed to the column beam frame and integrated. FIG. 27 is an explanatory view showing a state in which the column beam frame is reinforced by the seismic reinforcement method of Patent Document 1 in a cross-sectional view seen from the height direction of the column beam frame at a position passing through the existing beam on the upper side. As shown in FIG. 27, the seismic reinforcement method of Patent Document 1 is applied to a column beam frame 810A in which an existing column 811 protrudes outward (downward in FIG. 27) from an existing beam 816, and the reinforcement column of the reinforcement unit 820 is applied. The column beam frame 810A is reinforced by fixing 821L and 821L to the existing columns 811 and 811 on the left and right sides and the reinforcing beam 821H of the reinforcing unit 820 to the upper existing beam 816, respectively.

  Further, in Patent Document 2, in an existing building, a plurality of reinforcing pieces are formed in a square frame shape on the inner side surface of an opening portion of a square frame-shaped column beam frame composed of an existing column and an existing beam. A seismic reinforcement method is described in which a bonded reinforcing unit is inserted and fitted, and the reinforcing unit is fixed to the column beam frame and integrated.

  Further, in Patent Document 3, in an existing building, among square columnar beam frames made of an existing column and an existing beam, a steel material and its side are provided on the side surfaces of the existing columns on the left and right sides inside the opening. A seismic reinforcement method is described in which prismatic reinforcing units formed by covering the periphery with fiber reinforced concrete are respectively arranged, and the reinforcing units are fixed to the side surfaces of the existing columns and integrated. This construction method is applied to a column beam frame having no step between the outer side surface of the existing column and the outer side surface of the existing beam when the opening of the column beam frame is viewed from the height direction.

JP 2009-46966 A JP 2008-2091 A JP 2010-48032 A

  However, in the case where the existing building is an apartment house with a veranda that projects outwardly from the building body, the prior art has the following problems.

(1) In Patent Document 1, since the portal frame-shaped reinforcing unit is structured to be fitted into the inner side surface of the opening of the column beam frame and integrated with the column beam frame, the reinforcement beam on the upper side of the reinforcement unit is It protrudes downward from the existing beam on the upper side of the column beam frame, and the height to the reinforcement beam at the opening of the column beam frame provided with the reinforcement unit is lower than the height before the reinforcement unit is attached. For this reason, when a square frame-shaped reinforcing unit is attached to the opening of the column beam frame located between the living room and the veranda, a person such as a resident will have a head when entering and leaving the living room and the veranda. There is a possibility that the portion may hit the reinforcing beam on the upper side of the reinforcing unit, which may hinder the living.

  Further, the seismic reinforcement method of Patent Document 1 can be applied to a column beam frame having a structure in which an existing column protrudes outside the existing beam. In particular, as a floor of a veranda in an apartment house, a slab extends from the existing beam to the outside of the building body. It cannot be applied to a column beam frame with a protruding structure.

(2) Similar to Patent Document 1, Patent Document 2 also has a structure in which a rectangular frame-shaped reinforcing unit is fitted and attached to the inner side surface of the opening of the column beam frame, and the upper reinforcing beam of the reinforcing unit is a column. There is a risk of protruding downward from the existing beam on the upper side of the beam frame and hitting the head of the head on the reinforcing beam on the upper side of the reinforcing unit.

(3) In Patent Document 3, unlike Patent Documents 1 and 2, since the reinforcement unit cannot be attached to the existing beam on the upper side, the height of the opening to which the reinforcement unit is attached is the height before the attachment of the reinforcement unit. Maintained.

  However, in Patent Document 3, there is no step between the existing column and the existing beam, and the prismatic reinforcing unit is formed on the side surfaces of the existing columns on the left and right sides of the opening of the column beam frame located between the living room and the veranda. If attached, the reinforcing unit may protrude to the room side. Therefore, if seismic reinforcement is performed with this reinforcement unit, a remodeling work for the opening of the column beam frame may be required in addition to the seismic reinforcement work, and the construction cost becomes high. In addition, the field of view from the living room to the veranda through the opening of the column beam frame is blocked and narrowed by the prismatic reinforcing unit, so that the comfort in the room is impaired. Therefore, it is practically difficult to adopt the reinforcement of the column beam frame between the living room and the veranda with the prismatic reinforcement unit by the earthquake-proof reinforcement method of Patent Document 3 to increase the earthquake resistance.

  The present invention has been made in order to solve the above-described problems, and in an existing building having an outer floor portion that projects and circumscribes the building body, a column beam positioned between the room and the outer floor portion. When the frame is seismically reinforced with the reinforcement unit, it can be used for the seismic reinforcement method and its construction method which can go in and out between the room and the outer floor without any inconvenience and can suppress the construction cost of seismic reinforcement. An object is to provide a reinforcing piece.

  In order to solve the above problems, the seismic reinforcement method and the reinforcing piece of the present invention have the following configuration.

(1) An existing building comprising a building body constructed of a rectangular frame-shaped column beam frame composed of existing columns and existing beams, and a slab that circumscribes the building body and projects horizontally to the outside. Among the frames, in the seismic reinforcement method that strengthens the outer side column beam frame located between the interior of the building body and the slab with the reinforcement unit to increase the earthquake resistance of existing buildings, the reinforcement unit consists of steel and its surroundings. The reinforcement piece is formed of a reinforcement piece integrally formed with concrete covering the wall, and the reinforcement piece has a straight vertical side reinforcement portion arranged in a direction along the height direction of the existing column, and the vertical side reinforcement portion of the reinforcement piece Is supported and fixed to the lower slab of the outer wall-side column beam frame.
In addition, the slab of the present invention includes, for example, a platen that forms a floor structure that supports a vertical load on the surface, such as a veranda and a balcony, as well as a top floor fence including a one-story building, It means a plate material such as concrete slab that circumscribes and extends horizontally. In addition, when the building body is a building with two or more floors and the outer wall has a lower floor, there is no floor slab placed between the lower floor and the upper floor immediately above it, or there is no lower floor. Each of the foundation slabs placed on the top of the underground beam corresponds to the slab of the present invention.

(2) In the seismic retrofitting method described in (1), the vertical side reinforcement part is arranged on the outer side surface of the existing column with respect to each of the existing columns on both the left and right sides. It is applied along the height direction on each outer side surface of each, and the vertical reinforcement part of the reinforcement piece is inserted and fitted between the upper slab and the lower slab of the outer wall side column beam frame, It is characterized by being fixed to the upper slab and the lower slab, and to be joined and fixed to the additional hit.
(3) In the seismic reinforcement method described in (1) or (2), the reinforcing unit is a reinforcing piece having a linear horizontal reinforcing portion disposed in a direction along the existing beam of the outer wall side column beam frame. At least one set is included, the horizontal reinforcement is large enough to be placed on the outer side of the existing beam on the upper side, and the horizontal reinforcement is placed outside the existing beam on the upper side of the outer wall-side column beam frame. Arranged at positions facing the side and the lower surface of the upper slab, and joined and fixed to the upper slab, and the reinforcing unit is arranged on the outer side of each existing column on the left and right sides by the horizontal reinforcement part The front end portions of the vertical reinforcing portions are connected to each other upward to form a symmetrical gate-shaped frame shape.
(4) The seismic reinforcement method described in (3) is characterized in that the horizontal side reinforcing portion is disposed in the outer side surface of the upper existing beam.
(5) In the seismic reinforcement method described in any one of (1) to (4), the vertical reinforcing portion of the reinforcing piece has at least one end at a position facing the slab with respect to the height direction. A support part having a surface larger than the cross section of the vertical side reinforcement part in the horizontal direction is formed, and the reinforcement piece is fixed by joining the support part to the slab.
(6) In the seismic reinforcement method described in (5), the support portion is provided at the lower end in the height direction of the vertical reinforcement portion, and the reinforcement piece is attached to the lower slab with an anchor bolt or an adhesive. It is characterized by being bonded to and fixed.

(7) In the seismic reinforcement method described in (3) or (4), the reinforcing piece having the horizontal side reinforcing portion has two sets, and the reinforcing unit has one set of reinforcing pieces having the horizontal side reinforcing portion, The vertical side reinforcing portions are connected to each other at the top, and the other pair of reinforcing pieces having the horizontal side reinforcing portions is used to connect the front ends of the vertical side reinforcing portions at the bottom to form a symmetrical left-right frame. It is formed in a shape.
(8) In the seismic strengthening method described in any one of (2) to (7), the extra striking is formed below the width of the outer side surface of the existing column with respect to the width direction along the existing beam. It is characterized by.
(9) In the seismic reinforcement method described in any one of (3) to (8), the reinforcing piece is formed integrally with the vertical reinforcing portion and the horizontal reinforcing portion orthogonal to the L-shaped shape. It is characterized by.
(10) In the seismic reinforcement method described in any one of (1) to (9), the reinforcement unit is configured by connecting a plurality of reinforcement pieces at a joint portion, and the joint portion is an adjacent reinforcement piece. The tip portions of the steel materials exposed from the end portions are connected and connected by bolting.
(11) In the seismic reinforcement method described in (10), the joint is filled with grout around the ends of the connected steel materials, and the side surfaces of adjacent reinforcing pieces sandwiching the joint are substantially flush. It is formed in the shape.
(12) In the seismic reinforcement method described in any one of (1) to (11), the reinforcing piece is a precast member manufactured in advance in a factory, and the reinforcing unit is installed on the outer wall-side column beam frame. A plurality of reinforcing pieces selected corresponding to the shape are assembled and assembled at an earthquake-proof reinforcement site of an existing building.
(13) A reinforcing piece for use in the seismic reinforcement method described in any one of (1) to (12).

  The operation and effect of the seismic reinforcement method and the reinforcing piece of the present invention having the above-described configuration will be described.

(1) An existing building comprising a building body constructed of a rectangular frame-shaped column beam frame composed of existing columns and existing beams, and a slab that circumscribes the building body and projects horizontally to the outside. Among the frames, in the seismic reinforcement method that strengthens the outer side column beam frame located between the interior of the building body and the slab with the reinforcement unit to increase the earthquake resistance of existing buildings, the reinforcement unit consists of steel and its surroundings. Reinforcement piece formed integrally with concrete (fiber reinforced concrete etc.) covering the reinforcement, and the reinforcement piece has a linear vertical reinforcement part arranged in the direction along the height direction of the existing pillar, and is reinforced Since the vertical reinforcing part of the piece is supported and fixed to the lower slab of the outer wall-side column beam frame, for example, in addition to the veranda provided on each floor, the veranda on the top floor For existing buildings such as multi-storey apartment houses with fences provided at opposite positions, a reinforcement unit formed of reinforcement pieces with vertical reinforcements is installed at least on the outdoor side of existing columns Therefore, it does not occupy a part of the indoor space or the frame of the outer wall side column beam frame. Therefore, even if a reinforcement unit is installed in an existing building, the existing outer floor (veranda, balcony) that can be in and out of the room through the opening of the exterior beam-side column beam frame, that is, a slab that circumscribes the building body and projects horizontally to the outside. Etc.) and the interior of the building (existing building) can be enhanced by the reinforcement unit so that the reinforcement unit does not get in the way when people enter and leave the room.

  In addition, when retrofitting an existing building as described above, for example, it is not necessary to demolish and reinforce existing outer floors such as verandas and balconies, and the existing outer floors are removed and restored. Construction costs are no longer required, and seismic reinforcement construction costs can be reduced. In particular, if the existing building is a multi-storey apartment house, the veranda on each floor is provided with an evacuation exit (evacuation route) stipulated by the Fire Service Act. If (outer floor) is demolished temporarily, an alternative evacuation route is required separately. In the seismic retrofitting method of the present invention, the veranda can be used as it is during the seismic retrofitting work, so there is no need for an alternative evacuation route. It can be carried out.

  Therefore, in an existing building with an outer floor part that is circumscribed by the building body, when the column beam frame located between the room and the outer floor part is seismically reinforced by the reinforcing unit, the room and the outer floor part It is possible to enter and exit without any inconvenience, and it is possible to suppress the construction cost of seismic reinforcement.

(2) In the seismic strengthening method described in claim (1), the vertical side reinforcing portion is disposed on the outer side surface of the existing column with respect to each of the existing columns on the left and right sides, Insert the vertical reinforcement of the reinforcement piece between the upper slab and the lower slab of the outer wall-side column beam frame on the outer side of each existing column along the height direction. It is characterized by being fitted and fixed to the upper slab and the lower slab, and joined and fixed to the additional slab, so that the vertical reinforcement part of the reinforcement piece protrudes to the indoor side of the building body In the field of view from the room to the outer floor through the opening of the outer wall-side column beam frame, the area blocked by the construction of the reinforcing unit can be kept relatively small. Or even if it constructs a reinforcement unit, the field of view to an outer floor part can also be prevented from being blocked by the reinforcement unit. Moreover, even if a reinforcement unit is constructed, the reduction of the area that can be taken into the room from the opening of the outer wall-side column beam frame can be kept relatively small. It is also possible to prevent the lighting from being blocked by the reinforcing unit. Therefore, for a person such as a resident, securing of the habitability can be maintained.

  In addition, the reinforcing unit does not protrude to the indoor side of the building main body, is fixed to the upper slab and the lower slab outside the outer wall side column beam frame, and for each existing column on the left and right sides, It is fixed by being joined to the additional strike integrally made on each outer side surface. Therefore, it is not necessary to replace the fittings such as windows and doors that open and close the opening of the outer wall-side column beam frame of the building body with new fittings having different sizes in accordance with the reinforcement by the reinforcement unit. Therefore, since the remodeling work of the opening part of the outer wall side column beam frame accompanying replacement of the joinery is unnecessary, the entire construction cost for the seismic reinforcement can be suppressed at a low cost.

(3) In the seismic reinforcement method described in (1) or (2), the reinforcing unit is a reinforcing piece having a linear horizontal reinforcing portion disposed in a direction along the existing beam of the outer wall side column beam frame. At least one set is included, the horizontal reinforcement is large enough to be placed on the outer side of the existing beam on the upper side, and the horizontal reinforcement is placed outside the existing beam on the upper side of the outer wall-side column beam frame. Arranged at positions facing the side and the lower surface of the upper slab, and joined and fixed to the upper slab, and the reinforcing unit is arranged on the outer side of each existing column on the left and right sides by the horizontal reinforcement part The vertical side reinforcements are connected to each other at the top to form a symmetrical gate-shaped frame shape. When responding to (direction fluctuation) Compared to, reinforcing the strength by the reinforcing units (reinforcing rigidity) increases, shockproof building body that is reinforced with a reinforcing unit, also supports the roll (horizontal swinging), improved. In addition, when a person such as a resident enters and exits between an outer floor such as a veranda or a balcony and a room of a building body, among the reinforcing units, the horizontal reinforcing portion of the reinforcing piece located above the head If the head is higher than the person's head, the head does not hit the horizontal reinforcing part of the reinforcement unit, and the reinforcement piece is not at the foot and does not catch the foot. For this reason, it is possible to maintain the comfort of living.

(4) In the seismic reinforcement method described in (3), the horizontal side reinforcing portion is arranged in the plane of the outer side surface of the upper existing beam. The height is the same as the height before construction of the reinforcement unit, and when a person goes in and out between the room and the outer floor through the opening of the column wall frame on the outer wall, the person It does not hit the horizontal reinforcement of the reinforcement unit.

(5) In the seismic reinforcement method described in any one of (1) to (4), the vertical reinforcing portion of the reinforcing piece has at least one end at a position facing the slab with respect to the height direction. A support part having a surface larger than the cross section of the vertical side reinforcement part in the horizontal direction is formed, and the reinforcement piece is fixed by joining the support part to the slab. It can be fixed to the slab while being stably supported by a wide seating surface. Moreover, workability | operativity when fixing a reinforcement piece to a slab improves.

(6) In the seismic reinforcement method described in (5), the support portion is provided at the lower end in the height direction of the vertical reinforcement portion, and the reinforcement piece is attached to the lower slab with an anchor bolt or an adhesive. When the existing building is shaken by an earthquake, the reinforcement piece is supported by the lower slab in a stable state, especially when the shake is large. It becomes difficult for the unit to be separated from the outer wall-side column beam frame due to shaking.

(7) In the seismic reinforcement method described in (3) or (4), the reinforcing piece having the horizontal side reinforcing portion has two sets, and the reinforcing unit has one set of reinforcing pieces having the horizontal side reinforcing portion, The vertical side reinforcing portions are connected to each other at the top, and the other pair of reinforcing pieces having the horizontal side reinforcing portions is used to connect the front ends of the vertical side reinforcing portions at the bottom to form a symmetrical left-right frame. Since it is formed into a shape, the reinforcement strength (reinforcement rigidity) of the reinforcement unit is sufficient for pitching and rolling as well as shaking in the direction in which pitching and rolling are combined. The existing building reinforced by the reinforcement unit will be a building with excellent earthquake resistance (seismic strength).

(8) In the seismic strengthening method described in any one of (2) to (7), the extra striking is formed below the width of the outer side surface of the existing column with respect to the width direction along the existing beam. Therefore, the reinforcing piece having the vertical side reinforcing portion can be arranged close to the center side in the width direction of the existing column, and in the outer wall side column beam frame after the construction of the reinforcing unit, the opening in the frame It can suppress that the magnitude | size of becomes smaller than the magnitude | size before construction of a reinforcement unit.

(9) In the seismic reinforcement method described in any one of (3) to (8), the reinforcing piece is formed integrally with the vertical reinforcing portion and the horizontal reinforcing portion orthogonal to the L-shaped shape. Therefore, the L-shaped reinforcing piece can be placed at the corner where the existing column and the existing beam cross in the outer wall side column beam frame. The connection between the L-shaped reinforcing piece and the other reinforcing pieces can be performed while avoiding the corners between the columns and the existing beams, so that the workability at this time is improved.

(10) In the seismic reinforcement method described in any one of (1) to (6), the reinforcement unit is configured by connecting a plurality of reinforcement pieces at a joint portion, and the joint portion is an adjacent reinforcement piece. Since the front ends of the steel materials exposed from the ends are connected by bolting and connected, the front ends of the steel materials can be connected by other connecting means such as welding, but reinforcement The pieces can be connected more securely and securely, and the connection work at this time is different from other connection means such as welding, and does not require a special dedicated device and can be easily performed with a general-purpose tool. Can do.

(11) In the seismic reinforcement method described in (10), adjacent joint pieces that are filled with grout (fiber reinforced grout, etc.) around the ends of the connected steel materials and sandwich the joints in the joints. The side surfaces of the outer wall side column beam frame are inserted between the upper slab and the lower slab in a reinforcing unit composed of a plurality of reinforcing pieces. When inserting and fixing to the upper slab and the lower slab, the reinforcement unit that connects the concrete (fiber reinforced concrete, etc.) of adjacent reinforcement pieces sandwiching the joints with the grout According to the size, it can be fixed to the outer wall-side column beam frame without any gaps.

  That is, in an existing building, when there are multiple exterior wall side beam frames with the same design dimensions in the building body, each exterior wall side beam frame generally includes a dimensional error of several millimeters. May be formed. Therefore, even if a specific outer wall-side column beam frame is measured and a reinforcement unit is configured using a plurality of reinforcement pieces that are formed in advance based on the measured outer wall-side column beam frame, the size of the reinforcement unit However, among other non-specific outer wall-side column beam frames, the size of the actual outer wall-side column beam frame may not exactly match. Alternatively, even if the reinforcement unit is configured by using a plurality of reinforcement pieces including a reinforcement piece formed in advance with a fixed length, including a reinforcement piece that has been subjected to additional work such as cutting at an earthquake-proof reinforcement site of an existing building, the reinforcement unit The size of may not exactly match the size of the actual exterior beam-side column beam frame.

  In the seismic reinforcement method of the present invention, for example, in an outer wall-side column beam frame, reinforcement pieces according to the positions of the corners at the four corners of the existing columns on the left and right sides, the upper slab and the lower slab intersecting with these existing columns And a joint portion of adjacent reinforcing pieces is disposed at a position away from the corner portion. And after connecting the front-end | tip parts of the steel materials exposed from the edge part of an adjacent reinforcement piece by bolting, a fiber reinforcement grout is filled into the circumference | surroundings of the connected front-end | tip parts of the steel materials. As a result, the fiber reinforced concrete of adjacent reinforcement pieces sandwiching the joint is connected by the fiber reinforced grout, and the size of the reinforcing unit is adjusted by the actual outer wall side column beam frame size and the fiber reinforced grout filling part Thus, the reinforcing unit can be fixedly inserted into the actual outer wall-side column beam frame so as to be fitted and fixed in a state where a certain reinforcing strength (reinforcing rigidity) can be secured in the reinforcing unit.

(12) In the seismic reinforcement method described in any one of (1) to (11), the reinforcing piece is a precast member manufactured in advance in a factory, and the reinforcing unit is installed on the outer wall-side column beam frame. Since the reinforcement piece selected according to the shape is assembled and assembled at the seismic reinforcement site of the existing building, the reinforcement piece can be manufactured in a mass production system at the factory. Can be manufactured at low cost.

(13) Since the reinforcing piece is characterized by being used in the seismic reinforcement method described in any one of (1) to (12), the reinforcing piece can be reduced in size and improved in portability. Therefore, it is possible to efficiently carry in the work of bringing in an existing building to which seismic reinforcement is performed and the work of assembling the reinforcement unit. Therefore, when performing seismic retrofitting work that reinforces existing buildings and increases seismic strength with a reinforcing unit composed of reinforcing pieces, the seismic retrofitting work can be performed efficiently and the construction period is shorter. As a result, the cost for the seismic reinforcement work can be reduced.

It is a front view which shows roughly the existing building reinforced earthquake-proof with the reinforcement unit of the earthquake-proof reinforcement method which concerns on Embodiment 1. FIG. In FIG. 1, it is AA arrow sectional drawing. 1. It is a BB arrow sectional drawing in FIG. It is a front view which shows roughly the existing building before earthquake-proof reinforcement. It is CC sectional view taken on the line in FIG. In FIG. 4, it is DD sectional view taken on the line. It is the figure which decomposed | disassembled and showed the reinforcement unit used with the earthquake-proof reinforcement method which concerns on Embodiment 1 for every reinforcement piece. FIG. 9 is a cross-sectional view of the reinforcement piece of the reinforcement unit used in the earthquake-proof reinforcement method according to Embodiments 1 to 3 common to the arrows EE and FF in FIG. 7. It is explanatory drawing which shows the structure of the junction part of the reinforcement unit which concerns on Example 1. FIG. It is explanatory drawing which shows the structure of the junction part of the reinforcement unit which concerns on Example 2. FIG. It is process drawing of the construction method by the earthquake-proof reinforcement construction method concerning Embodiment 1, and is the 1st process drawing which shows the state before providing a reinforcement unit in an outer wall side column beam frame. FIG. 12 is a process diagram illustrating a second process, following FIG. 11. FIG. 13 is a process diagram illustrating a third process, following FIG. 12. FIG. 14 is a process diagram illustrating a fourth process, following FIG. 13. FIG. 15 is a process diagram illustrating a fifth process, following FIG. 14. FIG. 16 is a process diagram illustrating a sixth process, following FIG. 15; It is explanatory drawing of the existing building reinforced earthquake-proof with the earthquake-proof reinforcement method concerning the modification 1. FIG. It is the figure which decomposed | disassembled and showed the reinforcement unit used with the seismic reinforcement construction method which concerns on Embodiment 2 for every reinforcement piece. It is process drawing of the construction method by the earthquake-proof reinforcement construction method concerning Embodiment 2, and is a figure which shows the state before filling the connection part of a reinforcement piece with a fiber reinforcement grout. It is a front view which shows roughly the existing building reinforced earthquake-proof with the reinforcement unit of the earthquake-proof reinforcement method which concerns on Embodiment 2. FIG. It is explanatory drawing of the existing building reinforced earthquake-proof with the earthquake-proof reinforcement method which concerns on the modification 2. FIG. It is the figure which decomposed | disassembled and showed the reinforcement unit used with the seismic reinforcement construction method which concerns on Embodiment 3 for every reinforcement piece. It is explanatory drawing which shows the junction part of the reinforcement unit used with the earthquake-proof reinforcement method concerning Embodiment 3. FIG. It is a reinforcement unit used with the earthquake-proof reinforcement method concerning Embodiment 3, and is a figure which shows the state before filling the connection part of a reinforcement piece with a fiber reinforcement grout. It is a front view which shows roughly the existing building reinforced earthquake-proof with the reinforcement unit of the earthquake-proof reinforcement method which concerns on Embodiment 3. FIG. It is explanatory drawing of the existing building reinforced earthquake-proof with the earthquake-proof reinforcement method concerning the modification 3. It is explanatory drawing shown in the cross-sectional view which looked at the mode which reinforced the column beam frame by the earthquake-proof reinforcement construction method of patent document 1 from the height direction of the column beam frame in the position which passes along the upper existing beam.

  Hereinafter, Embodiment 1 thru | or 3 is demonstrated in detail based on drawing about the earthquake-proof reinforcement construction method and reinforcement piece which concern on this invention. In Embodiments 1 to 3, the case where the existing building is a multi-storey apartment house provided with a veranda on the top floor (not shown) in addition to the veranda provided on each floor will be described. In addition, the description of the seismic reinforcement method and the reinforcing piece of the present invention exemplifies a specific room and its veranda located between the upper floor and the lower floor on the floor with a part of the apartment house for convenience of explanation. An explanation will be given based on the examples.

(Embodiment 1)
First, an existing building that performs seismic reinforcement will be briefly described with reference to FIGS. FIG. 4 is a front view schematically showing an existing building before the seismic reinforcement. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4, and FIG. 6 is a cross-sectional view taken along the line DD in FIG.

  As shown in FIGS. 4 to 6, the existing building 1 includes, as a veranda 4, a slab 3 made of reinforced concrete that circumscribes the building body 2 and projects horizontally outward. The building body 2 is constructed in the form of a skeleton of the entire apartment building by a rectangular frame shape made of reinforced concrete with a rectangular frame made of the existing columns 11 and 11 on both the left and right sides and the existing beams 16 and 16 on both the upper and lower sides. Among the beam frames 10, the outer wall side column beam frame 10 </ b> A is located between the room (the specific room RM or the like) of the building body 2 and the slab 3 that is the floor of the outdoor veranda 4.

  That is, in FIG. 4, when viewed from the specific room RM (see FIG. 5), the outer wall side columnar frame 10 </ b> A includes the existing columns 11, 11 on both the left and right sides and the upper existing beam positioned above the specific room RM. 16 (16U) and a lower existing beam 16 (16L) which becomes the upper existing beam 16 in the room immediately below the specific room RM. In the present embodiment, as shown in FIG. 5, the existing column 11 and the existing beam 16 are formed in the same plane with no step on the outer end surface opposite to the specific chamber RM. Further, the upper slab 3 (3U) forming the veranda 4 on the floor directly above the specific room RM is circumscribed with the upper existing beam 16 (16U) in an integral structure and projects horizontally toward the outside of the building body 2. ing. Similar to the upper slab 3 (3U), the lower slab 3 (3L) forming the veranda 4 communicating with the specific room RM is circumscribed with the above-described lower existing beam 16 (16L) in an integrated structure, It protrudes horizontally toward the outside of the main body 2 and is disposed substantially parallel to the upper slab 3 (3U) on the floor directly above the specific room RM.

  FIG. 1 is a front view schematically showing an existing building that is seismically reinforced by a reinforcement unit of the seismic reinforcement method according to the present embodiment. However, in order to make the figure easy to see, FIG. 1 shows the slab in a cross-sectional view with the handrail portion of the veranda 4 omitted. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 7 is an exploded view of the reinforcing unit used in the seismic reinforcement method according to the present embodiment for each reinforcing piece, and FIG. 8 is a cross-sectional view of the reinforcing piece shown in FIG. Since the existing building 1 is a building that does not meet the current building structure standards, it needs to be reinforced by the reinforcing unit 20 described below to increase the earthquake resistance.

  Next, the reinforcing unit 20 will be described.

  First, an outline of the construction of the reinforcing unit 20 will be described. As shown in FIG. 1 to FIG. 3 and FIG. 7, in the present embodiment, the reinforcing unit 20 includes two reinforcing pieces 21 </ b> I (21) and two reinforcing pieces 21 </ b> L (21) that are bilaterally symmetrical. It is assembled and assembled into a shape. When the existing building 1 is reinforced by the reinforcing unit 20, the building body 2 is provided with additional reinforcements 15 and 15 made of fiber-reinforced concrete on the outer side surfaces 11a and 11a of the existing pillars 11 and 11 on the left and right sides, respectively. It is applied along the vertical direction VT and is integrated with each of the existing pillars 11 and 11.

  That is, in the reinforcing unit 20, the reinforcing piece 21 (21I) has a linear vertical reinforcing portion 21Va disposed in the direction VT along the height direction of the existing pillar 11, as will be described later. The vertical side reinforcing portion 21Va of the reinforcing piece 21 is arranged on the outer side surface 11a of the existing column 11 with respect to the existing columns 11 and 11 on both the left and right sides, and the vertical side reinforcing portion 21Va is arranged on the outer wall side column beam frame 10A. The lower slab 3 (3L) is supported and fixed. Specifically, the vertical reinforcement 21Va of the two reinforcement pieces 21, that is, the vertical reinforcement 21Va of the reinforcement piece 21I and the vertical reinforcement 21Va of the reinforcement piece 21L are provided on the outer wall with respect to the existing pillars 11 on the left and right sides, respectively. It is inserted and fitted between the upper slab 3 (3U) and the lower slab 3 (3L) of the side beam frame 10A, and is inserted into the upper slab 3 (3U) and the lower slab 3 (3L). In addition to being fixed, the adhesive 33 is bonded and fixed to the additional strikes 15 and 15 on both the left and right sides.

  Further, the reinforcing piece 21 includes at least one set of reinforcing pieces having a linear horizontal reinforcing portion 21Ha disposed in the direction HL along the existing beam 11 of the outer wall side column beam frame 10A. The horizontal side reinforcing portion 21Ha of the reinforcing piece 21L is disposed at a position facing the outer side surface 16a of the existing beam 16U on the upper side of the outer wall side column beam frame 10A and the lower surface 3Ua of the slab 3 (3U), and the adhesive 33 Thus, the upper slab 3 (3U) is joined and fixed. The reinforcement unit 20 connects the horizontal reinforcement parts 21Ha and 21Ha of the two reinforcement pieces 21L so as to face each other, thereby connecting the two reinforcement pieces respectively disposed on the outer side surfaces 11a of the existing pillars 11 and 11 on the left and right sides. The top end portions of the 21L vertical reinforcing portion 21Va are connected to each other at the upper side to form a symmetrical gate-shaped frame shape. Thus, in order to increase the seismic strength of the building body 2, the reinforcing unit 20 is constructed on the outdoor side of the outer wall side column beam frame 10 </ b> A of the building body 2, and the building body 2 is reinforced.

  Next, the reinforcement piece 21 which comprises the reinforcement unit 20 is demonstrated using FIG. 1 thru | or FIG. 3, FIG. 7, and FIG. The reinforcing unit 20 is formed of a reinforcing piece 21 in which a steel material 22 and a concrete portion 23 covering its periphery are integrally formed. Specifically, as shown in FIG. 8, the reinforcing piece 21 covers the periphery of the steel material 22 that is H-shaped steel except for a flat portion on one side with a concrete portion 23 made of fiber-reinforced concrete in this embodiment. This is an integrally molded member. In addition, the concrete part 23 may be made of concrete such as a general SRC (Steel Reinforced Concrete) other than the fiber reinforced concrete. The reinforcement piece 21 is a precast member manufactured in advance at the factory, and the reinforcement unit 20 is configured to replace the plurality of reinforcement pieces 21 selected according to the installation shape on the outer wall-side column beam frame 10 </ b> A of the existing building 1. It is assembled and assembled at the seismic reinforcement site.

  In the present embodiment, as shown in FIG. 7, the reinforcing unit 20 includes two types of reinforcing pieces 21, i.e., an I-shaped reinforcing piece 21 </ b> I and an L-shaped reinforcing piece 21 </ b> L. The reinforcing piece 21L is substantially the same with only the shape being different. That is, the reinforcing piece 21 </ b> I has a linear vertical reinforcing portion 21 </ b> Va disposed in the direction VT along the height direction of the existing pillar 11, and is a member corresponding to one side of the reinforcing unit 20. The steel material 22 of the reinforcing piece 21I is formed of a straight H-shaped steel.

  The reinforcing piece 21L includes a vertical side reinforcing part 21Va and a linear horizontal side reinforcing part 21Ha arranged in the direction HL along the existing beam 16, and the vertical side reinforcing part 21Va and the horizontal side reinforcing part 21Ha. Are members integrally formed orthogonal to the L-shape and correspond to the two sides of the reinforcing unit 20. The steel material 22 of the reinforcing piece 21L is formed by making straight H-shaped steels orthogonal to each other in an L shape. The horizontal side reinforcing portion 21Ha is formed in a size that can be arranged in the surface of the outer side surface 16a with respect to the existing beam 16 (16U) on the upper side.

  On the vertical side reinforcing portion 21Va of the reinforcing piece 21I, a flat plate-like supporting portion 27 having a surface larger than the cross section of the vertical side reinforcing portion 21Va in the horizontal direction HL is formed at least at one side end facing the slab 3. Has been. Specifically, the support portion 27 is made of steel and is provided on the lower end side in the height direction VT of the vertical reinforcing portion 21Va. In the present embodiment, the support portion 27 has a through hole (not shown) through which the anchor bolt 32 is inserted. Yes. The reinforcing piece 21I has a joining portion 25 that is not covered with the concrete portion 23 and is exposed at the tip end portion 22T of the steel material 22 at the upper end side in the height direction VT in the vertical reinforcing portion 21Va.

  Further, the reinforcing piece 21L includes, in the vertical side reinforcing portion 21Va, a joint portion 25 that is not covered with the concrete portion 23 and is exposed only at the tip portion 22T of the steel material 22 at the lower end side in the height direction VT, and a horizontal side reinforcing portion. In 21Ha, it has the junction part 25 which is not covered with the concrete part 23, and the front-end | tip part 22T of the steel material 22 was exposed in the opposite edge part of the side orthogonal to the vertical side reinforcement part 21Va.

  The reinforcing unit 20 is configured by connecting a plurality of reinforcing pieces 21 (reinforcing pieces 21I, reinforcing pieces 21L) at the joining portions 25, and the joining portions 25 are steel members 22 exposed from the ends of the adjacent reinforcing pieces 21 and 21. , 22 are connected to each other by connecting the tip portions 22T and 22T with bolts.

  Here, the structure of the joint portion 25 that connects the adjacent reinforcing pieces 21 and 21 by bolting will be described with reference to the first embodiment and the second embodiment.

[Example 1]
FIG. 9 shows the structure of the joint portion of the reinforcing unit according to the first embodiment. In this embodiment, as shown in FIG. 7 and FIG. 9, among the reinforcing pieces 21 and 21 to be connected adjacent to each other, the front end portion 22T of the steel material 22 of one reinforcing piece 21 can be screwed with the bolt 31. The screw hole 22H is formed in a single place or a plurality of places (FIG. 7 shows a single place). Moreover, the rib 22J which has the through-hole which can penetrate the volt | bolt 31 in the front-end | tip part 22T of the steel material 22 of the other reinforcement piece 21 is single place or multiple places (FIG. 7 and FIG. 9 is shown by a single place), The tip portion 22T is provided in an integral structure. The one reinforcing piece 21 and the other reinforcing piece 21 are connected by a bolt fastening portion 26 in which the bolt 31 is inserted into the through hole of the rib 22J and screwed into the screw hole 22H.

[Example 2]
FIG. 10 shows the structure of the joint portion of the reinforcing unit according to the second embodiment. In this embodiment, as shown in FIG. 10, two flat plate portions facing each other in parallel are formed at the respective tip portions 22T and 22T of the H-shaped steel materials 22 and 22 of the reinforcing pieces 21 and 21 to be connected side by side. The 1st through-hole which lets the volt | bolt 31 penetrate is formed in the intermediate connection part to connect in the single location or multiple locations (2 locations in this embodiment). The two splice plates 24 have the same number of second through holes as the first through holes at the same pitch.

  In order to connect the reinforcing pieces 21 and 21 to each other, as shown in FIG. 10, the tip portions 22T and 22T of the steel materials 22 and 22 of the reinforcing pieces 21 and 21 to be connected adjacent to each other are made to face each other. On the plane of the intermediate connection portion between the portions 22T and 22T, the splice plate 24 is brought into contact with the tip portions 22T and 22T across each other. At this time, one splice plate 24 may be brought into contact with one side plane of the intermediate connection portion, or two splice plates 24 may be brought into contact with both side planes of the intermediate connection portion. Then, the connection between the one reinforcing piece 21 and the other reinforcing piece 21 is performed by inserting a bolt 31 such as a high tension bolt into the through hole of the splice plate 24 and the through hole of the intermediate connection part of the tip 22T. The bolt 31 and the nut are connected by a bolt fastening portion 26 that is fastened.

  Next, the construction method of the reinforcing unit 20 will be described with reference to FIGS. 1 to 3 and FIGS. 11 to 16. FIG. 11 is a process diagram of a construction method using the seismic reinforcement method according to the first embodiment, and is a first process diagram showing a state before the reinforcement unit is provided on the outer wall-side column beam frame. FIG. 12 is a process diagram illustrating the second process subsequent to FIG. 11. FIG. 13 is a process diagram illustrating a third process following FIG. 12. FIG. 14 is a process diagram illustrating the fourth process subsequent to FIG. 13. FIG. 15 is a process diagram showing the fifth process following FIG. 14. FIG. 16 is a process diagram illustrating the sixth process subsequent to FIG. 15.

  First, as the first step, in the outer wall side column beam frame 10A, the position and the width with respect to the direction (width direction) HL along the existing beam are determined for the additional striking 15 applied to the outer side surface 11a of the existing column 11 (see FIG. 11). . The additional hit 15 may be applied to the entire outer side surface 11a of the existing column 11, but preferably, the width of the additional hit 15 is equal to or less than the width of the outer side surface 11a of the existing column 11 (in this embodiment, the width of the additional hit 15). Is smaller than the width of the outer side surface 11a), and the additional hit 15 is preferably arranged at the center of the existing column 11 in the width direction HL. The reason is that the reinforcing piece 21 having the vertical reinforcing portion 21Va can be arranged close to the center side in the width direction HL of the existing column 11, and in the outer wall side column beam frame 10A after the construction of the reinforcing unit 20, It is because it can suppress that the magnitude | size of an opening part becomes smaller than the magnitude | size before the construction of the reinforcement unit 20 inside.

  If the width and construction position of the additional striking 15 are determined, the inner width dimension between the additional striking 15, 15 applied to the existing pillars 11, 11 on both the left and right sides is grasped. Further, in the height dimension between the lower surface 3Ua of the upper slab 3 (3U) and the upper surface 3La of the lower slab 3 (3L) and the outer side surface 16a of the upper existing beam 16 (16U), the height direction The thickness dimension of VT is grasped by measuring. Based on the inner width dimension, height dimension, and thickness dimension, the shape (reinforcing piece 21I, reinforcing piece 21L) of the reinforcing piece 21 used to constitute the reinforcing unit 20 and the size and quantity of the reinforcing piece 21 are determined. .

  Next, as a second step, as shown in FIG. 12, the increased hits 15, 15 having a width smaller than that of the existing pillar 11 are arranged in the width direction HL of the outer side faces 11 a, 11 a of the existing pillars 11, 11 on the left and right sides. In the center, along the height direction VT, it is applied to the entire area between the lower surface 3Ua of the upper slab 3 (3U) and the upper surface 3La of the lower slab 3 (3L). As shown in FIGS. 3 and 8 to be referred to, the additional striking 15 has a thickness that can secure an adhesive surface 15a having a size such that the contact surface 21a of the reinforcing piece 21 does not protrude at least to the outside (upper side in FIG. 3). The existing pillar 11 is placed by a well-known technique.

  Next, as a third step, as shown in FIG. 13, at the corners of the lower slab 3 (3 L), the outer side surface 11 a of the existing column 11, and the bonding surface 15 a of the additional hit 15, the support portion 27. The reinforcing piece 21I (21) is disposed so that is disposed on the lower surface 3Ua of the lower slab 3 (3L). In this state, the anchor bolt 32 is driven into and joined to the lower slab 3 (3L) from a through hole (not shown) of the support portion 27 to fix the reinforcing piece 21 and to fix the reinforcing piece 21 with the adhesive 33. The contact surface 21a is bonded and fixed to the bonding surface 15a of the additional hit 15. In the present embodiment, as shown in FIG. 2, the anchor bolt 32 has a male screw formed in its shaft portion, a through hole of the support portion 27 of the reinforcing piece 21I (21), and the lower slab 3 (3L). The lower slab 3 (3L) is sandwiched between the reinforcing piece 21L (reinforcing piece 21) disposed on the opposite side of the supporting portion 27 (on the veranda 4 side of the floor immediately below the specific room RM). The H-shaped steel material 22 is inserted through the flat plate portion. The reinforcing bolt 21I (21) is fixed to the lower slab 3 (3L) by fastening the shaft and the nut of the anchor bolt 32 penetrating the flat plate. The reinforcement piece 21I is applied to each of the existing pillars 11 on the left and right sides.

  For example, an epoxy resin adhesive is used as the adhesive 33. Examples of the anchor bolt 32 include an anchor bolt that can be integrally joined to the concrete slab 3 such as a hole-in anchor bolt or an adhesive anchor bolt. Instead of the anchor bolt 32, an epoxy resin adhesive may be used to join and fix the support portion 27 of the reinforcing piece 21I to the lower surface 3Ua of the lower slab 3 (3L).

  Next, as a fourth step, as shown in FIG. 14, the reinforcing piece 21 is formed at the corners of the upper slab 3 (3 U), the outer side surface 11 a of the existing column 11, and the bonding surface 15 a of the additional hit 15. The reinforcing piece 21L (21) is arranged so that the corner is arranged. Specifically, in the reinforcing piece 21L, the vertical reinforcing portion 21Va is arranged in a direction facing the outer side surface 11a of the existing column 11 with the contact surface 21a facing the bonding surface 15a of the additional hit 15. The horizontal reinforcing portion 21Ha is disposed in a direction facing the outer side surface 16a of the upper existing beam 16 (16U) with the contact surface 21a facing the lower surface 3Ua of the upper slab 3 (3U). The In this state, the joint portion 25 between the tip portion 22T of the steel material 22 of the reinforcement piece 21L and the tip portion 22T of the steel material 22 of the reinforcement piece 21I that has already been fixed in the third step is connected by the bolt fastening portion 26 described above. It joins and the reinforcement piece 21I and the reinforcement piece 21L are connected. The reinforcement piece 21L is applied to each of the existing pillars 11 on the left and right sides.

  In the fourth step, of the reinforcing pieces 21L, 21L located on the left and right sides, the tip 22T of the steel material 22 of one reinforcing piece 21L and the tip 22T of the steel material 22 of the other reinforcing piece 21L face each other. The left and right reinforcing pieces 21L, 21L are arranged. In the fifth step, as shown in FIG. 15, the tip 22T of the steel member 22 of one reinforcing piece 21L and the tip of the steel member 22 of the other reinforcing piece 21L are disposed. The joint part 25 with 22T is joined by the bolt fastening part 26, and the four reinforcement pieces 21 are connected. Thus, the four reinforcing pieces 21 including the left and right reinforcing pieces 21I and 21I and the left and right reinforcing pieces 21L and 21L are connected to each other by the bolt fastening portions 26 to form a symmetrical gate shape. After the four reinforcing pieces 21 are assembled in a gate shape, an adhesive 33 is provided between the contact surface 21a of the horizontal reinforcing portion 21Ha of the reinforcing piece 21L and the lower surface 3Ua of the upper slab 3 (3U). The horizontal reinforcing portion 21Ha of the reinforcing piece 21L is fixed to the upper slab 3 (3U).

  Next, as the sixth step, at the three joint portions 25 (see FIG. 15) in which the four reinforcing pieces 21 are connected, the front end portion 22T and the bolt fastening portion 26 of the steel material 22 are exposed, and the fiber reinforced grout 29 is exposed. Are filled around the tip portions 22T and 22T of the connected steel materials 22 and 22 and cured. The fiber reinforced grout 29 is a liquid filler that is injected to fill cavities, voids, and gaps in construction work, and is a fluid non-shrink mortar mixed with synthetic fibers. In addition to the fiber-reinforced grout 29, for example, cement-based, mortar-based, synthetic resin-based grout may be used. As shown in FIG. 16, the side surfaces of the adjacent reinforcing pieces 21, 21 sandwiching the joint portion 25 are formed in substantially the same plane by the fiber reinforcing grout 29, and the adjacent reinforcing pieces 21, 21 vertical side reinforcement parts 21Va and 21Va and horizontal side reinforcement parts 21Ha and 21Ha are connected without a level | step difference.

  Further, as shown in FIG. 1, the periphery of the support portion 27 of the reinforcing piece 21 </ b> I and the head of the anchor bolt 32 is also covered with the fiber reinforcing grout 29. As a result, the support portion 27 and the anchor bolt 32 can be prevented from being rusted, and if the support portion 27 and the anchor bolt 32 are left exposed to the outside, a person may be caught on their feet and injured. This has the effect of ensuring safety and preventing the deterioration of the design of the design. Thus, the reinforcing unit 20 is constructed on the outdoor side of the outer wall side column beam frame 10A of the building body 2.

  The operation and effect of the seismic reinforcement method and the reinforcing piece according to the present embodiment having the above-described configuration will be described. In the seismic reinforcement method according to this embodiment,

(1) An existing building body 2 constructed by a rectangular frame-shaped column beam frame 10 composed of an existing column 11 and an existing beam 16, and an existing slab 3 that circumscribes the building body 2 and projects horizontally outward. In the building 1, the outer wall side column beam frame 10 </ b> A located between the room RM of the building body 2 and the slab 3 in the column beam frame 10 is reinforced by the reinforcing unit 20 to increase the seismic strength of the existing building 1. In the seismic reinforcement method to be enhanced, the reinforcing unit 20 is formed by a reinforcing piece 21 integrally formed with a steel material 22 and a concrete portion 23 covering the periphery thereof, and the reinforcing piece 21 extends in a direction along the height direction VT of the existing pillar 11. It has a linear vertical reinforcing portion 21Va to be arranged, and the vertical reinforcing portion 21Va of the reinforcing piece 21 (21L) is supported and fixed to the lower slab 3 (3L) of the outer wall side column beam frame 10A. Is For example, in addition to the veranda 4 provided on each floor, an existing building such as a multi-storey apartment house provided with a fence provided at a position facing the veranda 4 on the top floor. 1, the reinforcing unit 20 formed of the reinforcing piece 21 (21I, 21L) having the vertical reinforcing portion 21Va is constructed at least on the outdoor side (the veranda 4 side) of the existing pillar 11, and the space of the room RM It does not occupy a part or the frame of the outer wall side column beam frame 10A. Therefore, even if the reinforcement unit 20 is applied to the existing building 1, the slab 3 circumscribing the building main body 2 and projecting horizontally to the outside, that is, the existing outside that can enter and exit the room RM through the opening of the outer wall side columnar frame 10A. Seismic strength of the building body 2 (existing building 1) by the reinforcing unit 20 so that the reinforcing unit 20 does not get in the way when a person goes in and out between the floor (veranda, balcony, etc.) 4 and the room RM. Can be increased.

  In addition, when the above-described existing building 1 is seismically reinforced, for example, it is not necessary to destroy the existing outer floor 4 such as a veranda or a balcony and perform the reinforcement work, and the existing veranda 4 (outer floor 4). This eliminates the need for construction costs for the removal and restoration thereof, and can reduce construction costs for seismic reinforcement. In particular, when the existing building 1 is a multi-storey apartment building, the veranda 4 on each floor is provided with an evacuation exit (evacuation route) stipulated by the Fire Service Act. If the veranda 4 is temporarily demolished, an alternative evacuation route is required separately. In the seismic strengthening method according to the present embodiment, the veranda 4 can be used as it is during the seismic strengthening work period, so an alternative evacuation route is unnecessary, and seismic strengthening is performed while ensuring the safety of residents through existing evacuation exits. Can be done.

  Therefore, in the existing building 1 provided with the veranda 4 that circumscribes the building body 2, the column beam frame 10 (outer wall side column beam frame 10 </ b> A) positioned between the room RM and the outer floor portion 4 is a reinforcing unit. When the seismic reinforcement is carried out at 20, the room RM and the veranda 4 can be entered and exited without inconvenience, and the construction cost of the seismic reinforcement can be suppressed.

(2) In the seismic reinforcement method described in (1), the vertical side reinforcement portion 21Va is disposed on the outer side surface 11a of the existing column 11 with respect to the existing columns 11 and 11 on both the left and right sides, respectively, Is applied to the outer side surfaces 11a and 11a of the existing pillars 11 and 11 on both the left and right sides along the height direction VT, and the vertical side reinforcing portion 21Va of the reinforcing piece 21 (21I and 21L) is connected to the outer wall side. It is inserted and fitted between the upper slab 3U (3) and the lower slab 3L (3) of the column beam frame 10A, and is fixed to the upper slab 3U and the lower slab 3L. The vertical reinforcing part 21Va of the reinforcing piece 21 (21I, 21L) does not protrude to the room RM side of the building body 2 and is open to the outer wall side column beam frame 10A. Part The view from the room RM through the veranda 4 can be suppressed relatively small area to be cut off by application of the reinforcing unit 20. Alternatively, even if the reinforcement unit 20 is installed, the view to the veranda 4 can be prevented from being blocked by the reinforcement unit 20. Moreover, even if the reinforcement unit 20 is constructed, a reduction in the area that can be taken into the room RM from the opening of the outer wall-side column beam frame 10A can be suppressed to a relatively small level. It is possible to prevent the lighting from being blocked by the reinforcing unit 20. Therefore, for a person such as a resident, securing of the habitability can be maintained.

  In addition, the reinforcing unit 20 does not protrude to the room RM side of the building body 2 and is fixed to the upper slab 3 (3U) and the lower slab 3 (3L) outside the outer wall-side column beam frame 10A. At the same time, the existing pillars 11 on both the left and right sides are joined and fixed to the additional strikes 15 and 15 integrally formed on the respective outer side surfaces 11a and 11a. Therefore, it is not necessary to replace the fittings such as windows and doors that open and close the opening of the outer wall side column beam frame 10 </ b> A of the building body 2 with new fittings having different sizes in accordance with reinforcement by the reinforcement unit 20. Therefore, since the remodeling work of the opening part of the outer wall side column beam frame 10A associated with the replacement of the joinery is not required, the entire construction cost for the seismic reinforcement can be suppressed at a low cost.

(3) In the seismic reinforcement method described in (1) or (2), the reinforcing unit 20 is a linear horizontal reinforcing portion 21Ha arranged in the direction HL along the existing beam 16 of the outer wall side column beam frame 10A. Including at least one set of reinforcing pieces 21 (21L) having the horizontal side reinforcing portion 21Ha with respect to the existing beam 16 on the upper side so that the horizontal side reinforcing portion 21Ha can be disposed on the outer side surface 16a. The upper side slab 3U (3) is disposed at a position facing the outer side surface 16a of the upper existing beam 16U (16) on the upper wall side column beam frame 10A and the lower surface 3Ua of the upper slab 3U (3). The vertical reinforcing part 2 is arranged such that the reinforcing unit 20 is arranged on the outer side surfaces 11a, 11a of the respective existing pillars 11, 11 on the left and right sides by the horizontal side reinforcing part 21Ha. Since the front ends of Va and 21Va are connected to each other at the upper side to form a left-right symmetric gate-shaped frame shape, only the existing pillars 11 and 11 on both the left and right sides are reinforced and pitched (vertically The strength of reinforcement (reinforcement rigidity) by the reinforcement unit 20 is greater than that in the case of dealing with (direction fluctuation), and the seismic resistance of the building body 2 reinforced by the reinforcement unit is lateral (swing in the horizontal direction). Corresponding to and improving. In addition, when a person such as a resident enters and exits between the outer floor 4 such as a veranda or a balcony and the room RM of the building body 2, the reinforcing piece 21 </ b> L located above the reinforcing unit 20. If the horizontal reinforcing portion 21Ha of (21) is at a position higher than the head, the head does not hit the horizontal reinforcing portion 21Ha of the reinforcing unit 20, and the reinforcing piece 21 is not at the foot and hooks the foot. Therefore, it is possible to maintain the comfort of living for a person such as a resident.

(4) In the seismic reinforcement method described in (3), the horizontal-side reinforcing portion 21Ha is arranged in the surface of the outer side surface 16a of the upper existing beam 16U (16). The height of the opening of the beam frame 10A is the same as the height before construction of the reinforcing unit 20, and when a person goes in and out between the room RM and the veranda 4 through the opening of the outer wall side column beam frame 10A, The head does not hit against the horizontal reinforcing part 21Ha of the overhead reinforcing unit 20.

(5) In the seismic reinforcement method described in any one of (1) to (4), the vertical-side reinforcing portion 21Va of the reinforcing piece 21 has at least a position facing the slab 3 with respect to the height direction VT. A support portion 27 having a surface larger than the cross section of the vertical reinforcing portion 21Va in the horizontal direction HL is formed at one end, and the reinforcing piece 21 is fixed by joining the supporting portion 27 to the slab 3. Therefore, the reinforcing piece 21 can be fixed to the slab 3 while being stably supported by the wide seating surface of the support portion 27. Moreover, workability | operativity when fixing the reinforcement piece 21 to the slab 3 becomes good.

(6) In the seismic reinforcement method described in (5), the support portion 27 is provided on the lower end side in the height direction VT of the vertical side reinforcement portion 21Va, and the reinforcement piece 21 (21I) is the anchor bolt 32 or the adhesive 33. Therefore, when the existing building 1 is shaken by an earthquake, the reinforcing piece 21 (21I) is in a stable state because the support portion 27 is fixed by being joined to the lower slab 3L (3). The reinforcement unit 20 is supported by the lower slab 3L, and in particular, when a large vibration occurs, the reinforcing unit 20 is difficult to separate from the outer wall-side column beam frame 10A due to the vibration.

(8) In the seismic reinforcement method described in any one of (2) to (7), the additional hit 15 is less than the width of the outer side surface 11a of the existing column 11 with respect to the width direction HL along the existing beam 16. Since it is formed, the reinforcing piece 21 (21I, 21L) having the vertical side reinforcing portion 21Va can be arranged close to the center side in the width direction HL of the existing column 11, and the reinforcing unit 20 In the outer wall side column beam frame 10 </ b> A after construction, the size of the opening in the frame can be suppressed from becoming smaller than the size before construction of the reinforcing unit 20.

(9) In the seismic reinforcement method described in any one of (3) to (8), the reinforcing piece 21 (21I, 21L) has an L-shaped vertical reinforcing portion 21Va and a horizontal reinforcing portion 21Ha. The L-shaped reinforcing piece 21L can be arranged at the corner where the existing column 11 and the existing beam 16 intersect in the outer wall side column beam frame 10A. Even when connecting to the other reinforcing piece 21, it is possible to connect the L-shaped reinforcing piece 21 </ b> L and the other reinforcing piece 21, avoiding the corners of the existing pillar 11 and the existing beam 16. Workability is improved.

(10) In the seismic reinforcement method described in any one of (1) to (6), the reinforcing unit 20 is configured by connecting a plurality of reinforcing pieces 21 (21I, 21L) at the joint portion 25, and joining The portion 25 is characterized in that the tip portions 22T and 22T of the steel materials 22 and 22 exposed from the ends of the adjacent reinforcing pieces 21 and 21 are connected and connected by bolts 31 at the bolt fastening portion 26. Therefore, the reinforcement pieces 21 and 21 can be more securely connected to each other, and the connection work at this time is different from other connection means such as welding, and does not require a special dedicated device. Can be done easily with a simple tool.

(11) In the seismic reinforcement method described in (10), a fiber reinforced grout 29 is filled in the joints around the tips 22T and 22T of the connected steel materials 22 and 22 and the joints 25 are sandwiched between them. Since the side surfaces of the combined reinforcing pieces 21 and 21 are formed in substantially the same plane, the reinforcing unit 20 including the four reinforcing pieces 21 is used to form the slab 3U (upper slab 3U) of the outer wall side column beam frame 10A. 3) Concrete between adjacent reinforcement pieces 21 sandwiching the joint 25 when inserted and fitted between the lower slab 3L (3) and fixed to the upper slab 3U and the lower slab 3L The reinforcing unit 20 in which the portions 23 and 23 are connected by the fiber reinforced grout 29 is fixed to the outer wall side column beam frame 10A without any gaps in accordance with the size of the outer wall side column beam frame 10A. It can be.

  That is, in the existing building 1, when there are multiple exterior wall side beam frames with common design dimensions in the building body, each exterior wall side beam frame generally has a dimensional error of several millimeters. It may be formed including. Therefore, even if a specific outer wall-side column beam frame is measured and a reinforcement unit is configured using a plurality of reinforcement pieces that are formed in advance based on the measured outer wall-side column beam frame, the size of the reinforcement unit However, among other non-specific outer wall-side column beam frames, the size of the actual outer wall-side column beam frame may not exactly match. Alternatively, even if the reinforcement unit is configured by using a plurality of reinforcement pieces including a reinforcement piece formed in advance with a fixed length, including a reinforcement piece that has been subjected to additional work such as cutting at an earthquake-proof reinforcement site of an existing building, the reinforcement unit The size of may not exactly match the size of the actual exterior beam-side column beam frame.

  In the seismic reinforcement method according to the present embodiment, for example, in the outer wall side column beam frame 10A, the left and right existing columns 11, 11, the upper slab 3U (3) intersecting with these existing columns 11, 11, and the lower slab Reinforcing pieces 21L (21) are arranged in accordance with the positions of the corners at the four corners of 3L (3), and joints 25 of adjacent reinforcing pieces 21 are arranged at positions away from the corners. And after connecting the front-end | tip parts 22T and 22T of the steel materials 22 and 22 exposed from the edge part of the adjacent reinforcement pieces 21 and 21 by the bolt fastening part 26 by bolt 31 fastening, it connected to the junction part 25. The fiber reinforced grout 29 is filled around the tip portions 22T and 22T of the steel materials 22 and 22. Thereby, the concrete parts 23 and 23 of the adjacent reinforcement pieces 21 and 21 sandwiching the joint part 29 are connected by the fiber reinforcement grout 29, and the size of the reinforcement unit 20 is the same as the size of the actual outer wall side column beam frame 10A. The fiber reinforced grout 20 is adjusted at the filling portion, so that the reinforcement unit 20 is inserted into the actual outer wall-side column beam frame 10A and fitted, and a certain reinforcement strength (reinforcement rigidity) is secured in the reinforcement unit 20. It can be fixed in the completed state.

(12) In the seismic reinforcement method described in any one of (1) to (11), the reinforcing piece 21 is a precast member manufactured in advance in a factory, and the reinforcing unit 20 includes the outer wall side column beam frame 10A. Since the plurality of reinforcing pieces 21 (21I, 21L) selected corresponding to the installation shape are assembled and configured at the seismic reinforcement site (specific room RM) of the existing building 1, Since the reinforcing piece 21 can be manufactured in a mass production system at a factory, the reinforcing piece 21 can be manufactured at a low cost.

(13) Since the reinforcing piece is characterized by being used in the seismic reinforcement method described in any one of (1) to (12), the reinforcing piece can be reduced in size and improved in portability. Therefore, it is possible to efficiently carry in the work of bringing in an existing building to which seismic reinforcement is performed and the work of assembling the reinforcement unit. Therefore, when performing seismic retrofitting work that reinforces existing buildings and increases seismic strength with a reinforcing unit composed of reinforcing pieces, the seismic retrofitting work can be performed efficiently and the construction period is shorter. As a result, the cost for the seismic reinforcement work can be reduced.

(Embodiment 2)
Hereinafter, the seismic reinforcement method according to the second embodiment will be described with reference to FIGS.
In the first embodiment, the reinforcing unit 20 is configured by assembling two reinforcing pieces 21I (21) and two reinforcing pieces 21L (21) in a gate shape.
On the other hand, in the seismic reinforcement method according to the second embodiment, the reinforcing unit 120 is configured by assembling four reinforcing pieces 21L (21) in a symmetrical left-right frame shape.
That is, the first embodiment and the second embodiment differ in the shape of the reinforcing unit 120 and the number of reinforcing pieces 21I and 21L used for the configuration of the reinforcing unit 120, but the other parts are the same as in the first embodiment. It is the same.
Therefore, the description will focus on the parts different from the first embodiment, and the description of the others will be simplified or omitted.

  FIG. 18 is an exploded view of the reinforcing unit used in the seismic reinforcement method according to the second embodiment for each reinforcing piece. FIG. 19 is a process diagram of a construction method using the seismic reinforcement method according to the second embodiment, and is a diagram showing a state before the fiber reinforced grout is filled in the connection portion of the reinforcement piece. FIG. 20 is a front view schematically showing an existing building that is seismically reinforced by the reinforcing unit of the seismic reinforcement method according to the second embodiment.

  In the reinforcing unit 120, as shown in FIG. 18, the vertical reinforcing portion 21Va of the reinforcing piece 21 (21L) is supported and fixed to the slab 3 (3L) on the lower side of the outer wall side columnar frame 10A. The outer wall side column beam frame 10A has a straight vertical reinforcing portion 21Va arranged in the direction VT along the height direction of the existing column 11, and a straight line arranged in the direction HL along the existing beam 11. Four reinforcing pieces 21L (21) each having a horizontal horizontal reinforcing portion 21Ha are used in two sets (one set includes two reinforcing pieces 21L). As shown in FIG. 19, the four reinforcing pieces 21 </ b> L are connected by bolt fastening portions 26 at the four joint portions 25. The four reinforcing pieces 21L are inserted by inserting the four vertical reinforcing portions 21Va between the upper slab 3 (3U) and the lower slab 3 (3L) of the outer wall-side column beam frame 10A. Are fixed to the slab 3 (3U) and the lower slab 3 (3L), and are arranged on the outer side surface 11a of the existing column 11 with respect to the existing columns 11 and 11 on both the left and right sides, It is bonded and fixed to the bonding surfaces 15a and 15a of the additional hits 15 and 15 on the left and right sides, respectively.

  Further, in one set of the reinforcing pieces 21L out of the two sets of reinforcing pieces 21L, the horizontal side reinforcing portion 21Ha has the outer side surface 16a of the existing beam 16U on the upper side of the outer wall side column beam frame 10A and the slab 3 (3U). It is arrange | positioned in the position which opposes each lower surface 3Ua, and is joined and fixed to the upper slab 3 (3U) with the adhesive agent 33. FIG. In the other set of reinforcing pieces 21L, the horizontal side reinforcing portions 21Ha are arranged at positions facing the upper surface 3La of the lower slab 3 (3L) on the lower side of the outer wall side columnar frame 10A. The lower slab 3 (3L) is joined and fixed. In the joint portion 25 in which the four reinforcing pieces 21L are connected, as shown in FIG. 20, the fiber reinforced grout 29 is filled around the tip portions 22T and 22T of the connected steel materials 22 and 22, and the joint portion 25 is The side surfaces of the concrete portions 23 and 23 of the adjacent reinforcing pieces 21L and 21L sandwiched between each other are formed in substantially the same plane. Thereby, the vertical side reinforcement parts 21Va and 21Va of the adjacent reinforcement pieces 21L and 21L and the horizontal side reinforcement parts 21Ha and 21Ha are connected without a step.

  In this way, the reinforcing unit 120 connects the front ends of the vertical reinforcing portions 21Va of the one reinforcing piece 21L with one set of reinforcing pieces 21L having the horizontal reinforcing portion 21Ha, and The other set of reinforcing pieces 21L having the horizontal side reinforcing portions 21Ha are connected to each other at the lower ends of the vertical side reinforcing portions 21Va of the other set of reinforcing pieces 21L so as to form a symmetrical fold-shaped frame shape. Has been.

  The operation and effect of the seismic reinforcement method and the reinforcing piece according to the present embodiment having the above-described configuration will be described. In the seismic reinforcement method according to this embodiment,

(1) An existing building body 2 constructed by a rectangular frame-shaped column beam frame 10 composed of an existing column 11 and an existing beam 16, and an existing slab 3 that circumscribes the building body 2 and projects horizontally outward. In the building 1, the outer wall side column beam frame 10 </ b> A located between the room RM of the building body 2 and the slab 3 in the column beam frame 10 is reinforced by the reinforcing unit 120 to increase the seismic strength of the existing building 1. In the seismic reinforcement method to be enhanced, the reinforcement unit 120 is formed of a reinforcement piece 21 integrally formed with a steel material 22 and a concrete portion 23 covering the periphery thereof, and the reinforcement piece 21 (21L) is formed in the height direction VT of the existing pillar 11. The vertical reinforcing portion 21Va of the reinforcing piece 21 (21L) is supported by the lower slab 3 (3L) on the lower side of the outer wall-side column beam frame 10A. For example, in addition to the veranda 4 provided on each floor, a multi-storey apartment house provided with a fence provided at a position facing the veranda 4 on the top floor. For an existing building 1 such as a reinforcing unit 120 formed of a reinforcing piece 21 (21L) having a vertical reinforcing portion 21Va is installed at least on the outdoor side (on the veranda 4 side) of the existing pillar 11, and the room RM It does not occupy a part of the space or the frame of the outer wall side columnar frame 10A. Therefore, even if the reinforcing unit 120 is installed in the existing building 1, the existing exterior that can enter and exit the room RM through the opening of the slab 3 circumscribing the building body 2 and projecting horizontally outward, that is, the column wall frame 10A on the outer wall side. Seismic strength of the building body 2 (existing building 1) by the reinforcing unit 120 so that the reinforcing unit 120 does not get in the way when a person goes in and out between the floor 4 (veranda, balcony, etc.) and the room RM. Can be increased.

  In addition, when the above-described existing building 1 is reinforced with earthquake resistance, for example, it is not necessary to demolish the existing outer floor portion 4 such as a veranda or a balcony once to perform reinforcement work. For the removal and restoration of the existing veranda 4 The construction cost required is unnecessary, and the construction cost for seismic reinforcement can be suppressed. In particular, when the existing building 1 is a multi-storey apartment building, the veranda 4 on each floor is provided with an evacuation exit (evacuation route) stipulated by the Fire Service Act. If the veranda (outer floor) 4 is temporarily demolished, an alternative evacuation route is required separately. In the seismic strengthening method according to the present embodiment, the veranda 4 can be used as it is during the seismic strengthening work period, so an alternative evacuation route is unnecessary, and seismic strengthening is performed while ensuring the safety of residents through existing evacuation exits. Can be done.

  Therefore, in the existing building 1 provided with the veranda 4 that circumscribes the building body 2, the column beam frame 10 (outer wall side column beam frame 10 </ b> A) positioned between the room RM and the outer floor portion 4 is a reinforcing unit. When the seismic reinforcement is performed at 120, it is possible to enter and exit between the room RM and the veranda 4 without inconvenience, and the construction cost of the seismic reinforcement can be suppressed.

(7) The reinforcing piece 21 (21L) having the horizontal reinforcing portion 21Ha has two sets, and the reinforcing unit 120 has the tip of the vertical reinforcing portion 21Va by one set of reinforcing pieces 21L having the horizontal reinforcing portion 21Va. The top portions of the vertical side reinforcing portions 21Va are connected to each other downward by the other pair of reinforcing pieces 21L having the horizontal side reinforcing portions 21Ha to form the left-right symmetrical frame shape. Therefore, the reinforcement strength (reinforcement rigidity) by the reinforcement unit 120 is sufficient for not only pitching and rolling, but also swaying in the direction in which pitching and rolling are combined. The existing building 1 having a size that can be reinforced and reinforced by the reinforcing unit 120 is a building having excellent earthquake resistance (seismic strength).

(Embodiment 3)
Hereinafter, the seismic reinforcement method according to the third embodiment will be described with reference to FIGS. 22 to 25.
In the first embodiment, the reinforcing unit 20 is configured by assembling two reinforcing pieces 21I (21) and two reinforcing pieces 21L (21) in a gate shape.
On the other hand, in the seismic reinforcement method according to the third embodiment, the reinforcing unit 220 assembles the reinforcing pieces 21I (21) in pairs into an I-shaped frame shape, and the I-shaped frame-shaped reinforcing piece 21I. (21) is arranged symmetrically.
That is, the first embodiment and the third embodiment differ in the shape of the reinforcing unit 220 and the number of reinforcing pieces 21I and 21L used in the configuration of the reinforcing unit 220, but the other parts are the same as those in the first embodiment. It is the same.
Therefore, the description will focus on the parts different from the first embodiment, and the description of the others will be simplified or omitted.

  FIG. 22 is an exploded view of the reinforcement unit used in the seismic reinforcement method according to the third embodiment for each reinforcement piece. FIG. 23 is an explanatory view showing a joint portion of a reinforcement unit used in the seismic reinforcement method according to the third embodiment. FIG. 24 is a reinforcement unit used in the seismic reinforcement method according to the third embodiment, and is a view showing a state before the reinforcing piece connection portion is filled with fiber reinforced grout. FIG. 25 is a front view schematically showing an existing building that is seismically reinforced with a reinforcement unit of the seismic reinforcement method according to the third embodiment.

  In the reinforcing unit 220, the vertical reinforcing portion 21Va of the reinforcing piece 21I (21) is supported and fixed to the lower slab 3 (3L) of the outer wall side column beam frame 10A. Specifically, the reinforcing piece 21I (21) has a straight vertical reinforcing portion 21Va disposed in the direction VT along the height direction of the existing pillar 11, and the vertical reinforcing portion 21Va is connected to both left and right sides. Are arranged on the outer side surface 11 a of the existing column 11. The vertical reinforcing portions 21Va of the two reinforcing pieces 21 are provided between the upper slab 3 (3U) and the lower slab 3 (3L) of the outer wall side column beam frame 10A with respect to the existing columns 11 on the left and right sides. Inserted and fitted, fixed to the upper slab 3 (3U) and the lower slab 3 (3L), and joined to the bonding surfaces 15a and 15a of the left and right increased struts 15 and 15 by the adhesive 33, respectively. And fixed.

  Specifically, the reinforcing unit 220 includes two sets of I-shaped reinforcing pieces 21I (reinforcing pieces 21) each having a straight vertical reinforcing portion 21Va (one set includes two reinforcing pieces 21I). A total of four are used. Each of the four reinforcing pieces 21I has the support portion 27 described in the first embodiment on one side in the height direction VT of the vertical side reinforcing portion 21Va. As shown in FIG. 22, the set of reinforcing pieces 21 </ b> I has a supporting portion below the vertical reinforcing portion 21 </ b> Va with respect to the height direction (vertical direction in FIG. 24), like the reinforcing piece 21 </ b> I of the first embodiment. 27, a lower reinforcing piece 21I arranged on the upper side of the reinforcing piece 21I, and an upper reinforcing piece 21I arranged on the upper side of the vertical reinforcing part 21Va. Become.

  When the upper and lower reinforcing pieces 21 are fixed to the slab 3 with anchor bolts 32, the support portion 27 of the lower reinforcing piece 21 has through holes (not shown) through which the anchor bolts 32 are inserted, as in the first embodiment. doing. The support portion 27 of the upper reinforcing piece 21 also has a through hole (not shown) through which the anchor bolt 32 is inserted. On the other hand, when the reinforcing pieces 21 on both the upper and lower sides are fixed to the slab 3 with the adhesive 33, such through holes are not drilled in the support portions 27 and 27 of the upper and lower reinforcing pieces 21 and 21, respectively.

  In order to connect a pair of reinforcing pieces 21I and 21I, as shown in FIG. 23, the tip portions 22T and 22T of the steel materials 22 and 22 of the reinforcing pieces 21 and 21 to be connected adjacent to each other are made to face each other. The splice plate 24 is brought into contact with the front end portions 22T and 22T across the front end portions 22T and 22T on the plane of the intermediate connection portion between the front end portions 22T and 22T. At this time, one splice plate 224 may be brought into contact with one side plane of the intermediate connection part, or two splice plates 224 may be brought into contact with both side planes of the intermediate connection part. Then, the connection between the one reinforcing piece 21 and the other reinforcing piece 21 is performed by inserting a bolt 31 such as a high tension bolt into the through hole of the splice plate 24 and the through hole of the intermediate connection part of the tip 22T. The bolt 31 and the nut are connected by a bolt fastening portion 26 that is fastened. Two sets of reinforcing pieces 21I are applied to the existing pillars 11 on the left and right sides.

  As shown in FIG. 25, in the joint portion 25 in which the pair of reinforcing pieces 21I and 21I are connected, the fiber reinforced grout 29 is filled around the tip portions 22T and 22T of the connected steel materials 22 and 22, and joined. The side surfaces of the concrete portions 23 and 23 of the adjacent reinforcing pieces 21I and 21I sandwiching the portion 25 are formed in substantially the same plane. Thereby, the vertical reinforcement parts 21Va and 21Va of the adjacent reinforcement pieces 21I and 21I are connected to each other without a step. The periphery of the support portions 27 of the upper and lower reinforcement pieces 21 and 21 is covered with a fiber reinforced grout 29, and the upper and lower reinforcement pieces 21 and 21 are attached to the upper and lower slabs 3 (3L and 3U) with anchor bolts 32. In the case where the anchor bolt 32 is fixed, the periphery of the head of the anchor bolt 32 is also covered with the fiber reinforced grout 29.

  The operation and effect of the seismic reinforcement method and the reinforcing piece according to the present embodiment having the above-described configuration will be described. In the seismic reinforcement method according to this embodiment,

(1) An existing building body 2 constructed by a rectangular frame-shaped column beam frame 10 composed of an existing column 11 and an existing beam 16, and an existing slab 3 that circumscribes the building body 2 and projects horizontally outward. In the building 1, the outer wall side column beam frame 10 </ b> A located between the room RM of the building body 2 and the slab 3 in the column beam frame 10 is reinforced by the reinforcing unit 220 to increase the seismic strength of the existing building 1. In the seismic reinforcement method to be enhanced, the reinforcing unit 220 is formed by a reinforcing piece 21 integrally formed with a steel material 22 and a concrete portion 23 covering the periphery of the steel material 22, and the reinforcing piece 21 (21 L) is formed in the height direction VT of the existing pillar 11. The vertical reinforcing portion 21Va of the reinforcing piece 21 (21L) is supported by the lower slab 3 (3L) on the lower side of the outer wall-side column beam frame 10A. For example, in addition to the veranda 4 provided on each floor, a multi-storey apartment house provided with a fence provided at a position facing the veranda 4 on the top floor. For an existing building 1 such as a reinforcing unit 220 formed of a reinforcing piece 21 (21L) having a vertical reinforcing portion 21Va is installed at least on the outdoor side (on the veranda 4 side) of the existing pillar 11, and the room RM It does not occupy a part of the space or the frame of the outer wall side columnar frame 10A. Therefore, even if the reinforcement unit 220 is applied to the existing building 1, the existing exterior that can enter and exit the room RM through the opening of the slab 3 that circumscribes the building main body 2 and projects horizontally to the outside, that is, the outer wall-side column beam frame 10A. Seismic strength of the building body 2 (existing building 1) by the reinforcement unit 220 so that the reinforcement unit 220 does not get in the way when a person goes in and out between the floor (veranda, balcony, etc.) 4 and the room RM. Can be increased.

  In addition, when the existing building 1 described above is seismically reinforced, for example, it is not necessary to demolish the existing outer floor part 4 such as a veranda or a balcony and perform the reinforcement work. The construction cost for restoration becomes unnecessary, and the construction cost for seismic reinforcement can be suppressed. In particular, when the existing building 1 is a multi-storey apartment building, the veranda 4 on each floor is provided with an evacuation exit (evacuation route) stipulated by the Fire Service Act. If the veranda (outer floor) 4 is temporarily demolished, an alternative evacuation route is required separately. In the seismic strengthening method according to the present embodiment, the veranda 4 can be used as it is during the seismic strengthening work period, so an alternative evacuation route is unnecessary, and seismic strengthening is performed while ensuring the safety of residents through existing evacuation exits. Can be done.

  Therefore, in the existing building 1 provided with the veranda 4 that circumscribes the building body 2, the column beam frame 10 (outer wall side column beam frame 10 </ b> A) positioned between the room RM and the outer floor portion 4 is a reinforcing unit. When the seismic reinforcement is performed at 220, it is possible to enter and exit between the room RM and the veranda 4 without inconvenience, and the construction cost of the seismic reinforcement can be suppressed.

  In particular, the seismic strengthening method according to the present embodiment is suitable for a case where larger reinforcement is not required for the existing building 1 built with the seismic strength of the building body 2 increased in advance. It is suitable when you want to reduce the cost of reinforcement work by reinforcing only

  While the present invention has been described with reference to the first to third embodiments, the present invention is not limited to the first to third embodiments, and can be appropriately modified and applied without departing from the spirit of the present invention. .

(1) For example, in the first embodiment, the reinforcing unit 20 is configured by assembling two reinforcing pieces 21I and two reinforcing pieces 21L into a bilaterally symmetric portal frame shape. In the second embodiment, the reinforcing unit 120 is configured by assembling the four reinforcing pieces 21L in a symmetric frame shape. In the third embodiment, the reinforcing unit 220 is configured by assembling the reinforcing pieces 21I into an I-shaped frame shape and arranging the two reinforcing pieces 21I at symmetrical positions. However, the number of reinforcing pieces constituting the reinforcing unit, as well as the number of reinforcing pieces divided on the four sides on the left, right, top, and bottom sides of the reinforcing unit, is not limited to the embodiment and can be changed as appropriate. In addition to the reinforcing piece 21I and the reinforcing piece 21L, the reinforcing piece has, for example, a linear horizontal reinforcing portion disposed in a direction along the existing beam, and a reinforcing piece corresponding to one side of the reinforcing unit, A reinforcing piece corresponding to one side of the reinforcing unit, which has a linear vertical reinforcing portion arranged in a direction along the height direction of the existing pillar, and is not provided with support portions at both ends of the vertical reinforcing portion. You may use what was formed in the shape of.

(2) In the first to third embodiments, the reinforcing unit 20, 120, 220 is an existing building main body 2 constructed of the same planar outer-wall-side column beam frame 10A in which the existing column 11 and the existing beam 16 have no step. Construction was performed on Building 1. In addition, an existing building with a slab that is externally attached to the building body, which is constructed with an outer wall-side column beam frame with the existing columns protruding outside the existing beams, as a veranda, balcony, etc. In addition, the reinforcement unit by the seismic reinforcement method according to the following modified examples 1 to 3 can be constructed. The earthquake-proof reinforcement method according to the modified examples 1 to 3 will be briefly described with reference to FIGS. 17, 21, and 26. FIG. 17 is an explanatory diagram of an existing building that is seismically reinforced by the seismic reinforcement method according to the first modification.

  As shown in FIG. 17, the building body of an existing building is a collective housing by a rectangular frame shape reinforced concrete column beam frame 510 composed of existing columns 511, 511 on both left and right sides and existing beams 516, 516 on both sides. It is constructed as a whole skeleton. This building main body has an outer wall-side column beam frame 510A located between the interior of the column beam frame 510 and the slab 3 (3U, 3L) that circumscribes the building main body and projects horizontally outward. In the outer wall side column beam frame 510A (510), the outer side surface 511a of the existing column 511 protrudes from the outer side surface 516a of the existing beam 516 (516U) to the outdoor side.

[Modification 1]
The modification 1 is a case where the reinforcing unit 520 corresponding to the portal frame-shaped reinforcing unit 20 described in the first embodiment is applied to the outer wall-side column beam frame 510A. As shown in FIG. 17, the reinforcement unit 520 inserts the reinforcement piece 21I and the reinforcement piece 21L between the lower surface 3Ua of the upper slab 3 (3U) and the upper surface 3La of the lower slab 3 (3L). It is fitted and installed at positions facing the inner side surfaces 511b and 511b of the existing columns 511 and 511 and the outer side surface 516a of the existing beam 516 (516U).

[Modification 2]
FIG. 21 is an explanatory diagram of an existing building that is seismically reinforced by the seismic reinforcement method according to the second modification. The second modification is a case where the reinforcing unit 620 corresponding to the reinforcing unit 120 having the square frame shape described in the second embodiment is applied to the outer wall-side column beam frame 510A. As shown in FIG. 21, the reinforcing unit 620 is inserted and fitted with four reinforcing pieces 21L between the lower surface 3Ua of the upper slab 3 (3U) and the upper surface 3La of the lower slab 3 (3L), The existing columns 511 and 511 are arranged and installed at positions facing the inner side surfaces 511b and 511b of the existing columns 511 and 511 and the outer side surface 516a of the existing beam 516 (516U).

[Modification 3]
FIG. 26 is an explanatory diagram of an existing building that has been seismically reinforced by the seismic reinforcement method according to the third modification. The modification 3 is a case where the reinforcing unit 720 corresponding to the I-shaped frame-shaped reinforcing unit 220 described in the third embodiment is applied to the outer wall-side column beam frame 510A. As shown in FIG. 26, the reinforcing unit 720 is inserted and fitted with four reinforcing pieces 21I between the lower surface 3Ua of the upper slab 3 (3U) and the upper surface 3La of the lower slab 3 (3L), The existing columns 511 and 511 are arranged and installed at positions facing the inner side surfaces 511b and 511b of the existing columns 511 and 511 and the outer side surface 516a of the existing beam 516 (516U).

(3) In the third embodiment and the third modification, two reinforcing pieces 21I (21) each having a linear vertical reinforcing portion 21Va are used as a set, and the two reinforcing pieces 21I are connected to form an I-shaped frame. The one side of the reinforcing unit 220 was configured by assembling. However, as a reinforcing piece corresponding to one side of the reinforcing unit 220, a reinforcing piece in which two reinforcing pieces 21I are connected in an I-shaped frame shape is not formed by connecting a plurality of reinforcing units, but a single reinforcing piece. It may be formed in an I-shaped frame shape.

(4) In Embodiments 1 and 3 and Modifications 1 and 3, the shaft portion of the anchor bolt 32 is used as the through hole of the support portion 27 of the reinforcing piece 21I (21), the lower slab 3 (3L), and the lower side. An anchor bolt that penetrates the flat plate portion through the flat plate portion of the steel material 22 of the reinforcing piece 21L (21) disposed on the opposite side of the support portion 27. The shaft part of 32 and the nut were fastened, and the reinforcing piece 21I (21) was fixed to the lower slab 3 (3L). However, the fixing of the reinforcing piece to the lower slab with the anchor bolt is not limited to the first and third embodiments and the first and third modified examples, and the reinforcing piece is supported on the lower slab in a stable state. If it can be fixed, it can be changed as appropriate.

  As an example, the shaft portion of the anchor bolt 32 is inserted upward from the lower floor side of the specific room RM so that the head of the anchor bolt 32 is disposed on the lower floor side of the specific room RM. A nut that is screwed into the bolt 32 may be disposed at a position on the lower slab 3 (3L) side of the specific chamber RM.

  Alternatively, a cylindrical insert anchor having an internal thread formed on the inner periphery is embedded in the lower slab 3 (3L) of the specific chamber RM, and the shaft portion of the anchor bolt 32 is used as a support portion for the reinforcing piece 21I (21). The through hole 27 is inserted and screwed into the female screw of the insert anchor. The reinforcing piece 21I (21) may be fixed to the lower slab 3 (3L) by fastening the anchor bolt 32 and the insert anchor.

(5) In Embodiments 1 and 2 and Modifications 1 and 2, as shown in FIGS. 2 and 3, the reinforcing piece 21 (21I, 21L) is brought into contact with the vertical reinforcing portion 21Va by the adhesive 33. The surface 21a and the adhesive surface 15a of the additional hit 15 are bonded and fixed, and the reinforcing piece 21 (21L) is fixed to the abutting surface 21a of the horizontal reinforcing portion 21Ha and the lower surface 3Ua of the upper slab 3 (3U). Were adhered and fixed. Further, after the reinforcing piece 21 is bonded to the bonding surface 15a of the additional striking 15 and the lower surface 3Ua of the upper slab 3 (3U) with the adhesive 33, the reinforcing piece 21 (21I, 21L) is connected to the vertical side reinforcing portion. The side surface of 21Va (the surface orthogonal to the contact surface 21a in FIG. 8) and the outer side surface 11a of the existing pillar 11 may be adhered and fixed with an adhesive. Further, the reinforcing piece 21 (21L) is fixed by adhering the side surface of the horizontal reinforcing portion 21Ha (the surface orthogonal to the contact surface 21a in FIG. 8) and the lower surface 3Ua of the upper slab 3 (3U). May be.

1 Existing building 2 Building body RM Specific room (indoor)
3 Slab 3U Upper slab 3Ua Upper slab lower surface 3L Lower slab 3La Lower slab upper surface 10 Column beam frame 10A Exterior wall side column beam frame 11 Existing column 11a Outside side surface 15 Existing column 16 Additional beam 16U Upper side existing beam 16a Outer side surfaces 20, 120, 220 of upper existing beam Reinforcement unit 21 Reinforcement piece 21Va Vertical side reinforcement part 21Ha Horizontal side reinforcement part 21L L-shaped reinforcement piece 22 Steel material 22T Tip part 23 Concrete part (concrete )
25 Joint 27 Support 29 Fiber-reinforced grout (grout)
31 Bolt 32 Anchor bolt 33 Adhesive VT Height direction HL Direction along existing beam

Claims (13)

An existing building comprising a building body constructed with a rectangular frame-shaped column beam frame composed of existing columns and existing beams, and a slab that circumscribes the building body and projects horizontally outward, and Among them, in the seismic strengthening method for reinforcing the seismic strength of the existing building by reinforcing the outer wall side column beam frame located between the room of the building body and the slab with a reinforcing unit,
The reinforcing unit is formed of a reinforcing piece integrally formed of steel and concrete covering the periphery thereof, and the reinforcing piece is a linear vertical reinforcing portion disposed in a direction along the height direction of the existing column. Have
The vertical reinforcing portion of the reinforcing piece is supported and fixed to the slab below the outer wall-side column beam frame;
Seismic reinforcement method characterized by In the seismic reinforcement method according to claim 1,
The vertical reinforcing portion is disposed on the outer side surface of the existing column with respect to the existing columns on the left and right sides, respectively.
Incremental strikes are made along the height direction on the outer side surfaces of the existing pillars on both the left and right sides,
The vertical reinforcing portion of the reinforcing piece is inserted and fitted between the upper slab and the lower slab of the outer wall-side column beam frame, and fixed to the upper slab and the lower slab. And joining and fixing to the additional shot,
Seismic reinforcement method characterized by In the seismic reinforcement method according to claim 1 or claim 2,
The reinforcing unit includes at least one set of the reinforcing pieces having a linear horizontal reinforcing portion disposed in a direction along the existing beam of the outer wall side column beam frame;
The horizontal reinforcing portion is a size that can be arranged on the outer side surface of the existing beam on the upper side,
The horizontal side reinforcing portion is disposed at a position facing the outer side surface of the upper existing beam on the outer wall side column beam frame and the lower surface of the upper slab, and is fixed by being joined to the upper slab. about,
The reinforcing unit has a bilaterally symmetric gate-shaped frame shape by connecting upper ends of the vertical reinforcing portions arranged on the outer side surfaces of the existing pillars on the left and right sides by the horizontal side reinforcing portions, respectively. Formed,
Seismic reinforcement method characterized by In the seismic reinforcement method according to claim 3,
The horizontal reinforcement portion is disposed within the outer side surface of the upper existing beam. In the earthquake-proof reinforcement construction method according to any one of claims 1 to 4,
The vertical reinforcing portion of the reinforcing piece has a supporting portion having a surface in a horizontal direction larger than the cross section of the vertical reinforcing portion at at least one end at a position facing the slab with respect to the height direction. Formed,
The said reinforcement piece joins the said support part with the said slab, and is fixed, The earthquake-proof reinforcement construction method characterized by the above-mentioned. In the seismic reinforcement method according to claim 5,
The support portion is provided on the lower end side in the height direction of the vertical reinforcement portion, and the reinforcement piece is fixed by joining the support portion to the lower slab with an anchor bolt or an adhesive. A characteristic seismic reinforcement method. In the seismic reinforcement method according to claim 3 or claim 4,
The reinforcing piece having the horizontal side reinforcing portion has two sets,
The reinforcing unit is connected to the top ends of the vertical reinforcing portions by the one set of reinforcing pieces having the horizontal reinforcing portions, and the other set of the horizontal reinforcing portions. The reinforcing piece is formed into a symmetrical frame shape by connecting the tip portions of the vertical reinforcing portions downward,
Seismic reinforcement method characterized by In the earthquake-proof reinforcement construction method according to any one of claims 2 to 7,
The extra striking reinforcement method is characterized by being formed below the width of the outer side surface of the existing column with respect to the width direction along the existing beam. In the earthquake-proof reinforcement construction method according to any one of claims 3 to 8,
The said reinforcement piece is an earthquake-proof reinforcement construction method in which the said vertical side reinforcement part and the said horizontal side reinforcement part are integrally formed orthogonally to L-shaped shape. In the earthquake-proof reinforcement construction method according to any one of claims 1 to 9,
The reinforcing unit is configured by connecting a plurality of reinforcing pieces at a joint portion,
The joint portion is connected by connecting the tip portions of the steel materials exposed from the end portions of the adjacent reinforcing pieces by bolting and connecting them. In the seismic reinforcement method according to claim 10,
In the joint portion, grout is filled around the tip portions of the connected steel materials, and the side surfaces of the adjacent reinforcing pieces sandwiching the joint portion are formed in substantially the same plane. Seismic reinforcement method. In the earthquake-proof reinforcement construction method according to any one of claims 1 to 11,
The reinforcing piece is a precast member manufactured in advance in a factory,
The reinforcement unit is configured by assembling a plurality of the reinforcement pieces selected corresponding to the installation shape on the outer wall side column beam frame at an earthquake-proof reinforcement site of the existing building. Reinforcement method. A reinforcing piece for use in the seismic reinforcing method according to any one of claims 1 to 12.

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