JP2010196270A - Structure for reinforcing existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for reinforcing an existing building, which can simply and inexpensively reinforce the in-service building, without exerting an influence on a living environment. <P>SOLUTION: This structure for reinforcing the existing structure includes a building frame 20 which constitutes the existing building, and a reinforcing frame 10 which is installed outside the existing building. A notched portion 24 is formed on the outer surface of a balcony 23 which is positioned outside the building frame 20; and the reinforcing frame 10 is joined to the notched portion 24, so that the building frame and the reinforcing frame can transfer a shear force to each other during earthquakes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing structure for an existing building.

  Conventionally, as a general reinforcement structure for an existing building, a structure in which a reinforced concrete earthquake resistant wall, a steel brace, or the like is arranged in a space inside a beam column structure formed of columns and beams is known.

  However, in order to construct a reinforcing structure such as a seismic wall or a steel brace indoors for a building in service, it was necessary to temporarily stop the use of the part for constructing the reinforcing structure. Moreover, there existed a possibility that living performance might fall because a living space was narrowed by the reinforcement structure.

  Therefore, in Patent Document 1, an anchor bolt is driven into an existing frame structure from the outside of the building for the purpose of improving the seismic performance of the building without affecting the living environment. A method of reinforcing an existing structure in which reinforcement is performed by a frame formed along existing columns and beams via bolts is disclosed.

JP-A-11-62264

However, the reinforcement structure of the existing building described in Patent Document 1 has a large number of post-installed anchors installed on columns and beams for the purpose of integrating with the existing building, Due to noise, the building could not be used during construction.
In addition, when there is a balcony, it may be difficult to fit the frame along the existing frame structure, and it may not be possible to construct the frame.

  The present invention solves the above-mentioned problems, and proposes a reinforcement structure for an existing building that can be easily and inexpensively reinforced in-service buildings without affecting the living environment. Let it be an issue.

  In order to solve the above-mentioned problems, the present invention provides a reinforcing structure for an existing building comprising a frame that constitutes an existing building and a reinforcing frame that is installed outside the existing building, and is located outside the frame. A notch is formed on the outer surface of the horizontal member, and the reinforcing frame is joined to the notch so as to transmit the shearing force during an earthquake to each other. It is said.

The reinforcing frame may be joined to the horizontal member via mortar or concrete placed in the notch.
Further, the reinforcing frame includes a frame body constituted by reinforcing beams and reinforcing columns, and a connection member protruding from the frame body, and the connection member fixed to the notch portion A frame may be joined to the horizontal member.

  Furthermore, the reinforcing structure of the existing building may include a fiber reinforcing material attached to a joint portion between the reinforcing frame and the notched portion.

According to the reinforcement structure of such an existing building, the reinforcement can be performed without affecting the living environment in service by performing the reinforcement from the outside of the existing building.
In addition, since noise can be applied in a state where vibration is reduced, it can be reinforced while using an existing building in service.
Furthermore, since it is excellent in workability, it can be constructed quickly and inexpensively.

  According to the reinforcing structure of an existing building of the present invention, it is possible to simply and inexpensively reinforce a building in service without affecting the living environment.

It is a perspective view which shows the reinforcement structure which concerns on 1st Embodiment. (A) is a cross-sectional view showing the reinforcing structure of FIG. 1, and (b) is a cross-sectional view of the same. It is a perspective view which shows the reinforcement structure which concerns on 2nd Embodiment. (A) is a plane sectional view which shows the reinforcement structure of FIG. 3, (b) is the cross-sectional view. It is a figure which shows the notch part which concerns on the reinforcement structure of FIG. 3, Comprising: (a) is a front view, (b) is a longitudinal cross-sectional view. It is a figure which shows the reinforcement structure which concerns on 3rd Embodiment, (a) is an elevation view, (b) is a plane sectional view. (A) is AA sectional drawing of FIG. 6, (b) is BB sectional drawing, (c) is CC sectional drawing. It is an elevational view showing a modification of the reinforcing structure of FIG.

  Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

<First Embodiment>
As shown in FIG. 1, the reinforcing structure 1 according to the first embodiment includes a balcony (frame) 23 of an existing building and a reinforcing frame 10 installed outside the existing building.

As shown in FIG. 2A, the balcony 23 is a horizontal member that forms a part of the frame structure 20 of the existing building and is integrally connected to the column 21 and the beam 22. Facing.
As shown in FIG. 2B, a notch 24 is formed at the tip of the balcony 23, and the reinforcing frame 10 (reinforcing column 12) is joined (fitted) to the notch 24. .

  The notch 24 is formed in a concave shape by removing the existing handrail of the balcony 23 and excising the position where the existing handrail support column is erected.

  In the notch portion 24, the reinforcing column 12 of the reinforcing frame 10 is disposed. A solidifying material 25 made of mortar, concrete, or the like is placed around the reinforcing column 12, and the reinforcing frame 10 is joined to the notched portion 24 through the solidifying material 25.

Further, as shown in FIG. 2 (b), the notch 24 is formed by a carbon fiber sheet (fiber reinforcing material) 26 that is bonded to the reinforcing pillar 12 and the balcony 23 on the back surface of the balcony 23 with a resin. It is reinforced. The carbon fiber sheet 26 according to the present embodiment is formed by bundling a plurality of fibers, and the intermediate part of the carbon fiber sheet 26 is wound around the reinforcing column 12 and the fibers at both ends are fanned out. By sticking across the notch 24 and the balcony 23, the joint between the notch 24 and the reinforcing frame 10 is reinforced.
In the present embodiment, the carbon fiber sheet 26 is used as a reinforcing material for the notched portion 24, but the material used as the reinforcing material is not limited, for example, an aramid fiber or a polyester fiber is used.

As shown in FIG. 1, the reinforcing frame 10 includes a frame body 11 including reinforcing columns 12 and reinforcing beams 13.
The reinforcing frame 10 functions as a reinforcing structure for an existing building and also serves as a handrail for the balcony 23.

As shown in FIG. 2 (b), the reinforcing column 12 is composed of two rectangular steel pipes 12a, 12a and a steel plate 12b disposed between the rectangular steel pipes 12a.
As shown in FIGS. 1 and 2A, the reinforcing pillars 12 are continuously arranged in the vertical direction with respect to a plurality of layers. In addition, the structure of the reinforcement pillar 12 is not limited to the said structure, It is possible to set suitably.

  As shown in FIG. 2 (b), the reinforcing pillar 12 is disposed in the notch 24 formed in the balcony 23, and is joined to the balcony 23 by the solidified material 25 placed in the notch 24. ing.

A foundation structure (not shown) such as a direct foundation or a pile foundation is provided at the lower end of the reinforcing column 12 disposed at the ends (left and right both ends) of the reinforcing frame 10, and supports the axial force generated during an earthquake or the like. Is transmitted through the reinforcing frame 10.
In addition, a base structure capable of supporting the weight of the reinforcing frame 10 is provided at the lower end of the other reinforcing pillars 12.

  As shown in FIG. 1 and FIG. 2A, the reinforcing beam 13 is made of a steel having a T-shaped cross section, and is laid between adjacent reinforcing columns 12 and 12. Note that the material constituting the reinforcing beam 13 is not limited to a steel having a T-shaped cross section, and is appropriately selected from known materials such as H-shaped steel, groove-shaped steel, and L-shaped steel. It is possible.

The end of the reinforcing beam 13 in the longitudinal direction is butted against the side surface of the reinforcing column 12. In this embodiment, two upper and lower reinforcing beams 13 are arranged in parallel on each floor.
In the present embodiment, the lower reinforcing beam 13 is disposed at a height of 20 cm from the lower surface of the balcony, and the upper reinforcing beam 13 is disposed at a height of 1 m from the lower reinforcing beam. The arrangement of the reinforcing beams 13 is not limited and can be set as appropriate.

A rectangular frame 11 is formed on each floor by the left and right reinforcing columns 12 and 12 and the upper and lower reinforcing beams 13 and 13.
As shown in FIG. 1, the frame 11 is reinforced from the corners of the columns 14 and the reinforcing columns 12 and 13, each of which is made of a steel plate standing between the upper and lower reinforcing beams 13 and 13. An oblique member 15 made of a steel pipe connecting the corners of the beam 13 and the column 14 is disposed.

  In addition, the structure of the reinforcement frame 10 is not limited to the said structure, It is possible to set suitably. Moreover, the material of each member which comprises the reinforcement frame 10 is not limited.

Next, the construction method of the reinforcing structure 1 will be described.
First, an existing handrail (not shown) arranged at the tip of the balcony 23 is removed, and a concave notch 24 is formed by cutting the position and the door boundary where the existing handrail support is located.

The reinforcing pillar 12 is disposed in the notch 24 and temporarily fixed. Furthermore, a formwork is installed on the front surface (end surface of the balcony 23) and the bottom surface of the notch 24, and the solidifying material 25 is placed inside the notch 24.
Furthermore, the carbon fiber sheet 26 is affixed to the back surface of the balcony 23 in a state where the reinforcing pillar 12 is wound, and the notch 24 is reinforced.

Next, the reinforcing beams 13 and 13 are laid horizontally between the reinforcing columns 12, and the columns 14 and the diagonal members 15 are disposed.
Note that the method for fixing the reinforcing beam 13 to the reinforcing column 12 is not limited, and may be appropriately performed by a known means. Similarly, the fixing method of the support column 14 and the diagonal member 15 is not limited. Moreover, you may comprise the reinforcement frame 10 by combining the unit member formed integrally previously.

  As mentioned above, according to the reinforcement structure 1, since the reinforcement frame 10 can be fixed to the existing frame structure 20 without using a post-construction anchor, noise and vibration are reduced with the construction, and the use of the building in service The building can be reinforced without stopping.

Moreover, since it is comprised so that the shearing force at the time of an earthquake may mutually be transmitted between the frame structure 20 and the reinforcement frame 10, a desired reinforcement effect is securable.
In addition, the reinforcing structure 1 can be used in any building as long as it is an existing building having a horizontal member such as a balcony 23 or a fence.

  In addition, by performing construction while using the building, it is difficult for the construction to be subject to time restrictions, and as a whole, short-term construction is possible and costs can be reduced.

<Second Embodiment>
As shown in FIG. 3, the reinforcing structure 2 according to the second embodiment includes a balcony (frame) 23 of an existing building and a reinforcing frame 30 installed outside the existing building.

  As shown in FIGS. 4A and 4B, the balcony 23 is a horizontal member that constitutes a part of the frame structure 20 of the existing building and is integrally connected to the column 21 and the beam 22. Facing 20 outside.

  The balcony 23 is formed in an L-shaped cross section by a bottom 23a and a handrail 23b. A notch 24 is formed at the corner between the bottom 23a and the handrail 23b.

  A connection member 34 of the reinforcing frame 30 is disposed in the notch 24. The notch 24 of the present embodiment is formed at a position corresponding to the pillar 21 (in front of the pillar 21). In addition, the formation location of the notch 24 is not limited to the position corresponding to the column 21.

  The notch 24 is filled with a solidifying material 25. A carbon fiber sheet 26 is attached to the back surface of the balcony 23 at the joint between the reinforcing frame 30 and the notch 24.

As shown in FIG. 3, the reinforcing frame 30 includes a frame body 31 constituted by reinforcing columns 32 and reinforcing beams 33, and a connecting member 34 protruding from the frame body 31.
The frame body 31 is fixed to the housing structure 20 via a connection member 34 fixed to the notch 24.

The reinforcing pillar 32 is made of H-shaped steel, and is continuously arranged in the vertical direction with respect to a plurality of layers.
In the present embodiment, as shown in FIG. 4A, two reinforcing columns 32 and 32 are provided upright at locations corresponding to the columns 21 of the frame structure 20.

  The reinforcing column 32 is connected to the balcony 23 via a connecting member 34 and is disposed at a position away from the handrail portion 23b of the balcony 23 by a predetermined length. Further, the reinforcing columns 32 are connected to each other through a reinforcing beam 33 disposed between the reinforcing columns 32.

A foundation structure (not shown) such as a direct foundation or a pile foundation is provided at the lower end of the reinforcing pillar 32 disposed at the end (left and right both ends) of the reinforcing frame 30 to support the axial force generated during an earthquake or the like. Is transmitted through the reinforcing frame 30.
In addition, a base structure capable of supporting the weight of the reinforcing frame 30 is provided at the lower end of the other reinforcing columns 32.

  As shown in FIG. 3, the reinforcing beam 33 is made of H-shaped steel, and is laid across the reinforcing columns 32.

  The end of the reinforcing beam 33 in the longitudinal direction is butted against the side surface of the reinforcing column 32. In the present embodiment, the upper and lower reinforcing beams 33 are arranged in parallel on each floor.

  A rectangular frame 31 is formed in front of the handrail portion 23b by the left and right reinforcing columns 32, 32 and the upper and lower reinforcing beams 33, 33.

  The connection member 34 is made of H-shaped steel, and is fixed to the notch 24 to connect the frame body 31 and the frame structure 20.

  As shown in FIGS. 4A and 4B, a mounting plate 36 is integrally formed at the rear end (the tip of the balcony 23 side) of the connecting member 34, and the mounting plate 36 is formed on the bottom surface of the notch 24. It is being fixed by the anchor 35 in the state contact | abutted to.

  In addition, the structure of the reinforcement frame 30 is not limited to the said structure, It is possible to set suitably. The material of each member (reinforcing column 32, reinforcing beam 33, connecting member 34, etc.) constituting the reinforcing frame 30 is not limited to the H-shaped steel, and can be appropriately selected from known materials and used. It is.

Next, a construction method for the reinforcing structure 2 will be described.
First, the box-shaped notch 24 is formed at the tip of the balcony 23 by cutting the corners of the bottom 23a and the handrail 23b.

  In the present embodiment, as shown in FIG. 5 (a), the notch 24 is provided with two cores 24a, 24a in the horizontal direction at the corners of the balcony 23, and the surroundings 24b, 24b. To form a box shape. In addition, the formation method of the notch part 24 is not limited, It can carry out suitably.

Next, as shown in FIG. 5B, the connecting member 34 is inserted into the notch 24 and fixed via the anchor 35.
Then, the frame body 31 is fixed to the connection member 34.

Next, a mold is installed on the front surface and the bottom surface of the notch 24, and the solidifying material 25 is placed inside the notch 24.
In addition, the carbon fiber sheet 26 is radially attached to the bottom surface of the balcony 23 to reinforce the notch 24.

  In addition, the fixing method of the frame 31 is not limited, and may be performed as appropriate. The frame 31 may be individually loaded with the reinforcing pillar 32, the reinforcing beam 33, and the connecting member 34 and assembled on site, or the frame 31 formed in advance as a unit member may be loaded into the frame 31. It may be fixed to the structure 20.

  As mentioned above, according to the reinforcement structure 2, it becomes possible to obtain the same effect as the reinforcement structure 1 shown in 1st Embodiment.

<Third Embodiment>
As shown in FIGS. 6 and 7, the reinforcing structure 3 according to the third embodiment includes a balcony (frame) 23 of an existing building and a reinforcing frame 40 installed outside the existing building. .

As shown in FIGS. 6A and 6B, the reinforcing frame 40 includes a frame body 41 composed of reinforcing columns 42 and reinforcing beams 43, and a connection member 44 projecting from the frame body 41. I have.
The frame body 41 is fixed to the housing structure 20 via a connection member 44 fixed to the notch 24.

  As shown in FIG. 7B, the reinforcing column 42 is composed of two column bodies 42a and 42a made of H-shaped steel, and a plate member 42b that joins both the column bodies 42a and 42a. Further, as shown in FIG. 6A, the reinforcing pillars 42 are continuously arranged in the vertical direction with respect to a plurality of layers.

  As shown in FIG. 7C, plate members 42 b and 42 b are arranged in the front and rear of the panel zone that is a joint portion of the reinforcing beam 43 among the reinforcing pillars 42. Reinforced concrete is formed in the inner space of the plate members 42b and 42b.

In the present embodiment, as shown in FIG. 6B, reinforcing columns 42 are erected at locations corresponding to the columns 21 of the frame structure 20.
The reinforcing column 42 is connected to the balcony 23 via the connection member 44 and is disposed at a position away from the handrail portion 23b of the balcony 23 by a predetermined length. Further, the reinforcing columns 42 are connected to each other via a reinforcing beam 43 laid across the reinforcing columns 42.

A foundation structure (not shown), such as a direct foundation or a pile foundation, is provided at the lower end of the reinforcing column 42 disposed at the end (left and right both ends) of the reinforcing frame 40 to support the axial force generated during an earthquake or the like. It is comprised so that it may transmit to via the reinforcement frame 40.
Further, a base structure capable of supporting the weight of the reinforcing frame 40 is provided at the lower end of the other reinforcing pillars 42.

  As shown in FIG. 7 (a), the reinforcing beam 43 includes beam main bodies 43a and 43a made of H-shaped steel disposed vertically and a reinforced concrete portion 43b formed between the beam main bodies 43a and 43a. Configured. The concrete cast in the reinforced concrete portion 43b is, for example, high strength and high fluidity concrete.

  In this embodiment, the reinforced concrete portion 43b is formed between the beam main bodies 43a and 43a. However, as shown in FIG. 8, a truss is provided by arranging a steel plate between the beam main bodies 43a and 43a. The reinforcing beam 43 ′ may be configured in a shape.

  The connection member 44 is made of H-shaped steel and is fixed to the notch 24 to connect the frame body 31 and the frame structure 20.

  As shown in FIGS. 7A and 7C, the attachment plate 46 is integrally formed at the rear end (tip on the balcony 23 side) of the connection member 44, and the attachment plate 46 is formed on the bottom surface of the notch 24. It is being fixed by the anchor 45 in the state contact | abutted to.

  In addition, the structure of the reinforcement frame 40 is not limited to the said structure, It is possible to set suitably. Moreover, the material of each member (reinforcing column 42, reinforcing beam 43, connecting member 44, etc.) constituting the reinforcing frame 40 is not limited to H-shaped steel, and can be appropriately selected from known materials. It is.

  In addition, since the structure of the balcony 23 is the same as the content shown in 2nd Embodiment, detailed description is abbreviate | omitted.

Since the construction method of the reinforcement structure 3 is the same as that of the reinforcement structure 2 according to the second embodiment, detailed description thereof is omitted.
As mentioned above, according to the reinforcement structure 3, it becomes possible to obtain the effect similar to the reinforcement structure 1 shown in 1st Embodiment.

The preferred embodiments according to the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in each of the above embodiments, the mortar or concrete is filled in the notched portion, but if the reinforcing frame can be fixed, it is not always necessary to fill the mortar or concrete, and is fixed by a known method as appropriate. It is possible.

  In each of the above embodiments, the case where the reinforcing frame is configured by a steel structure has been described. However, the configuration of the reinforcing frame is not limited to the steel structure, and for example, a part or all of the structure is configured by a reinforced concrete structure. Also good.

1, 2, 3 Reinforcement structure 10, 20, 30 Reinforcement frame 11, 21, 31 Frame body 12, 32, 42 Reinforcement column 13, 33, 43 Reinforcement beam 20 Housing structure 21 Column 22 Beam 23 Balcony 24 Notch 25 Solidified Material 26 Carbon fiber sheet (fiber reinforcement)
34,44 connecting member

Claims (4)

A reinforcing structure of an existing building comprising: a frame constituting the existing building; and a reinforcing frame installed outside the existing building,
A notch is formed on the outer surface of the horizontal member located outside the housing,
A reinforcing structure for an existing building, wherein the reinforcing frame is configured to be connected to the cut-out portion so as to transmit a shearing force during an earthquake to each other.   The reinforcing structure for an existing building according to claim 1, wherein the reinforcing frame is joined to the horizontal member through mortar or concrete placed in the notch. The reinforcing frame includes a frame formed by reinforcing beams and reinforcing columns, and a connecting member protruding from the frame,
The reinforcing structure for an existing building according to claim 1, wherein the frame body is joined to the horizontal member through a connection member fixed to the notch. The reinforcing structure for an existing building according to any one of claims 1 to 3, further comprising a fiber reinforcing material attached to a joint portion between the reinforcing frame and the notched portion.

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