JPH1018639A - Reinforcing construction of building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bear horizontal external force efficiently and to promote vibration resistance of a building by arranging reinforced columns extended in the vertical direction, reinforced beams extended in the horizontal direction and reinforced braces built between the reinforced columns and reinforced beams, adjoined to each other in the diagonal direction and arranged in zig-zag to the outside of a building. SOLUTION: Reinforced columns 10 extended in the vertical direction along columns 10a positioned on the peripheral surface of the existing building 10 and reinforced beams 13 extended in the horizontal direction along beams 10b in every other floor are provided. Reinforced braces 14a and 14a as an X type brace are built between reinforced columns 12 and 12 placed forward, backward and sideways to each other and reinforced beams 13 and 13, and the reinforced braces 14 are arranged to the side of the building 10 in zig-zag. When large horizontal external force acts on the building 10 by earthquakes, axial force concentedly acting on the side ends of the building 10 can be greatly reduced. Since differences between the side ends and center section in a burden of axial force can be minimized, waste strength of the reinforced frame 11 can be reduced in the center section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for an existing building which is suitable for use in improving the earthquake resistance of an existing building, for example.

[0002]

2. Description of the Related Art Conventionally, in order to reinforce an existing building or the like, various reinforcing structures have been used, for example, by arranging a steel frame reinforcing unit between columns and beams, or increasing the number of existing concrete walls. ing.

As one kind of such a reinforcing structure, there is a structure in which a reinforcing frame is provided along a pillar of a building to be reinforced. This includes an inner frame type in which a reinforcing frame is provided inside a building and an outer frame type in which a reinforcing frame is provided along the outer peripheral surface of the building. However, in the case of the inner frame type, it cannot be used in a building during the construction period, and when this causes some trouble, an outer frame type reinforcing structure is applied.

[0004] As shown in FIG. 10, the reinforcing structure of the outer frame type has a structure in which a reinforcing frame 2 made of, for example, a steel frame is provided along the outer peripheral surface of the existing building 1. The reinforcing frame 2 includes columns 3, beams 4 located on the outer peripheral surface of the building 1.
, And a reinforcing brace 7 provided between the reinforcing columns 5 and the reinforcing beams 6. The reinforcing brace 7 is disposed over the entire side surface of the building 1. .

[0005]

However, the conventional structure for reinforcing a building as described above has the following problems. That is, when a large horizontal force acts on the building 1 due to an earthquake or the like, the pillar 3 at the side end 1a of the building 1 is particularly hard.
Therefore, the reinforcing frame 2 must bear a large axial force at the end portion 2b as compared with the central portion 2a. For this reason, if the entire reinforcing frame 2 is formed with uniform strength in accordance with the end 2b, the axial load balance will be biased, and the center 2a will be wasted in terms of strength.

In order to solve such a problem, for example, as shown in FIG. 11, a structure having reinforcing frames 8 provided only at both ends of a building 1 is provided. However, when a horizontal external force acts on such reinforcing frames 8 and 8 due to an earthquake or the like, as shown in FIG.
Compared with the case where the reinforcing frame 2 is provided on the entire side surface of
A larger axial force acts on the tension side of each reinforcing frame 8, and the fundamental problem has not been solved.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a building reinforcement structure capable of efficiently bearing horizontal external force and improving the earthquake resistance of the building. And

[0008]

The invention according to claim 1 is
A reinforcing frame made of steel is provided on the outer surface of the building, and the reinforcing frame includes a reinforcing column extending vertically.
It is composed of a reinforcing beam extending in the horizontal direction and a reinforcing brace provided between the reinforcing column and the reinforcing beam, and the reinforcing braces are arranged in a staggered manner adjacent to each other in a diagonal direction. And

According to a second aspect of the present invention, a reinforcing frame made of reinforced concrete is provided on the outer surface of the building, and the reinforcing frame has a structure in which rectangular reinforcing walls are combined, and these reinforcing walls are provided. The parts are arranged in a staggered manner adjacent to each other in an oblique direction.

[0010] The invention according to claim 3 is the invention according to claim 1 or 2.
In the reinforcing structure for a building according to the above, the reinforcing frame is:
It is characterized in that the height is gradually increased from the center of the building toward the side end.

The invention according to claim 4 is the invention according to claims 1 to 3
In the reinforcing structure of a building according to any one of the above, the reinforcing brace of the reinforcing frame is provided only in an upper layer of the building, and an inner reinforcing frame located inside the building is provided in a lower layer of the building. It is characterized in that it is configured as described above.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to fourth embodiments of a building reinforcement structure according to the present invention will be described with reference to FIGS.

[First Embodiment] First, here, an example in which a reinforcing frame is made of a steel frame will be described.

As shown in FIG. 1, an existing building 10 has, for example, a rectangular shape in a plan view and a reinforced concrete frame structure. In order to reinforce such a building 10, a steel frame reinforcing frame 11 is provided on the outer peripheral surface on all four sides.

The reinforcing frame 11 is provided along each column 10a located on the outer periphery of the building 10, and extends vertically, and extends horizontally along every other floor beam 10b. The reinforcing beam 13, the reinforcing column 12, and the reinforcing beam 1
And a reinforcing brace 14 installed between the three.

The reinforcing columns 12 are arranged at a position separated by a predetermined distance from the outer surface of each column 10a, and are fixed to each column 10a via unillustrated anchor bolts, shear reinforcing bars, filling mortar, and the like. Similarly to the reinforcing columns 12, the reinforcing beams 13 are fixed to the beams 10b via unillustrated anchor bolts, shear reinforcing bars, filling mortar, and the like.

The reinforcing brace 14 is a so-called X-shaped brace, and two reinforcing braces 14a, 14a are provided between the reinforcing columns 12, 12, and the reinforcing beams 13, 13, which are located vertically and horizontally.
Has been erected. Such reinforcing braces 14 are arranged in a staggered manner on the side surface of the building 10. That is, the reinforcing braces 14 are provided so as to be adjacent to each other in an oblique direction and not to be located on both sides of one reinforcing column 12 or the reinforcing beam 13.

Here, an axial force distribution model diagram when a horizontal external force due to an earthquake or the like acts on the building 10 provided with the reinforcing frame 11 is shown. As shown in FIG. 2, in a building 10 provided with the reinforcing frame 11, when a horizontal external force acts from the side due to an earthquake or the like, the horizontal external force is set to “1”.
P, the tensile axial force at the side end of the building 10 is “2.25P”, and the tensile or compressive axial force at other portions is “0.25P”. On the other hand, in the building 1 provided with the conventional reinforcing frame 8 (see FIG. 11), as shown in FIG. 12, when a horizontal external force is applied under the same conditions as above, the building 1 has a side end 1a. The acting tensile axial force is “3.75P”, and the compressive axial force at the position inside the reinforcing frame 8 is “3.75P”. In the axial force distribution model diagram, it is assumed that the distribution of the horizontal external force acting from the side is constant, and that all the horizontal external forces are processed by the reinforcing braces 9 and 14 of the reinforcing frames 8 and 11. Further, it is assumed that the columns 1 and 10 have the same column span and floor height.

As is clear from the axial force distribution model diagram, the building 1 provided with the reinforcing frame 11 shown in FIG.
At 0, in particular, the tensile axial force acting on the side end of the building 10 is about 60% with respect to the building 1 having the conventional reinforcing frame 8 shown in FIG.

In the above-described reinforcing structure of the building 10, the building 1
The reinforcing frame 11 is disposed on the outer surface of the reinforcing frame 11, and the reinforcing braces 14 of the reinforcing frame 11 are arranged in a staggered manner. Thereby, when a large horizontal external force due to an earthquake or the like acts on the building 10, the axial force acting intensively on the side end portion of the building 10 is compared with the conventional reinforcing structure of the building 1 using the reinforcing frames 2 and 8. Can be greatly reduced. Furthermore, since the difference in the axial load between the side end portion and the central portion of the building 10 can be reduced as compared with the related art, it is possible to reduce the wasteful strength of the reinforcing frame 11 particularly at the central portion. it can. In this way, the horizontal external force is efficiently borne by the reinforcing frame 11, and the building 10
Can improve the earthquake resistance. Moreover, since the reinforcing frame 11 is provided on the outer surface of the building 10,
The construction work can be performed while using the inside of the building 10.

In the first embodiment, the reinforcing brace 14 is an X-shaped brace, but the form of the brace does not matter. For example, as shown in FIG.
The reinforcing brace 14 'may be a so-called K-shaped brace.

[Second Embodiment] Next, a second embodiment of the building reinforcing structure according to the present invention will be described.
Here, a description will be given using an example in which a reinforcing frame disposed in a building is configured to gradually increase from the center of the building toward the side ends. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 4, the existing building 10 has
In order to reinforce it, a steel-frame reinforcing frame 21 is provided on the four outer peripheral surfaces.

The reinforcing frame 21 is configured to gradually increase from the center of the building 10 to the side end, and is provided at the side end to the top floor, and at the center to the fourth floor, for example. Is provided. The reinforcing frame 21 is provided on each pillar 10 a located on the outer periphery of the building 10.
A reinforcing column 12 provided along and extending vertically.
It is composed of a reinforcing beam 13 extending in the horizontal direction along the beam 10b on every other floor, and an X-shaped reinforcing brace 14 laid between the reinforcing columns 12 and the reinforcing beams 13, for example.

The reinforcing braces 14 are arranged in a staggered pattern on the side of the building 10. That is, one reinforcing brace 14 is disposed at the top of the side end of the building 10, and the other reinforcing braces 14 are provided so as to be adjacent to each other in an oblique direction with reference to this. In the present embodiment, the reinforcing braces 14 are arranged symmetrically left and right, and the reinforcing braces 14 are arranged right and left adjacent to each other in the center of the building 10.

The above-described reinforcing structure for the building 10 can provide the same effects as those of the first embodiment. In addition, the reinforcing frame 21 is configured to gradually increase from the center of the building 10 to the side end. In this way, the reinforcing frame 21 is provided at a high end at the side end to which a large axial force is applied, and is provided low at the center where the acting axial force is small. And the like, and the distribution of the axial force generated in such a manner can be matched, and the reinforcing frame 21 can more efficiently bear the horizontal external force and improve the earthquake resistance of the building 10.

[Third Embodiment] Next, a third embodiment of the building reinforcing structure according to the present invention will be described.
Here, an example in which a reinforcing frame provided on the outer side surface of a building is provided only in the upper layer of the building and an inner reinforcing frame is provided in the lower layer of the building will be described. In the following description, the same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 5, in an existing building 10,
In order to reinforce this, reinforcing frames 31 are arranged on the four outer peripheral surfaces.

The reinforcing frame 31 is composed of the reinforcing columns 12, the reinforcing beams 13, and the reinforcing braces 14, and is provided along the outer surface of the building 10 as in the second embodiment. The height is gradually increased from the center toward the side end. The reinforcing frame 31 has a configuration in which the reinforcing braces 14 are arranged in a staggered manner in an upper layer portion of the building 10 (for example, a portion on the third floor or higher).

An internal reinforcing frame 32 is provided in a lower part of the building 10 (for example, a portion up to the second floor above the ground). As shown in FIG. 6A, the inner reinforcing frame 32 includes a pair of inner pillars 34 provided so as to extend along the inner surface of the pillar 10 a in the lower layer of the building 10.
A reinforcing brace (not shown) is provided along the inner surface of the existing wall between the adjacent pillars 10a, 10a, and both ends thereof are joined to the inner pillars 34, 34, or an existing wall which is additionally beaten (not shown) ).

The inner pillars 34, 3 of the inner reinforcing frame 32
Reference numerals 4 are arranged on both sides of the building 10 so as not to interfere with the beams 10c arranged inside the building 10. The inner pillars 34 extend along the outer surface of the pillar 10 a of the building 10, and the reinforcing pillars 12 forming the reinforcing frame 31.
And the reinforcing column 12, the inner column 34, and the concrete portion 35 made of reinforced concrete, which are placed so as to integrally surround the column 10a, and are integrated with the existing column 10a.

As described above, in the lower layer of the building 10, the reinforcing braces 14 of the reinforcing frame 31
Are not exposed, and the reinforcing column 12 is also integrated with the column 10a by the concrete portion 35.

Further, as shown in FIG. 6B, in the underground part 10G of this building 10, the inner pillars 34, 34
The basement wall 36 is disposed continuously from the lower part shown in FIG.
Is integrated with the existing pillar 10a (or pile) by the shear reinforcing bar 37 anchored to the column and the concrete portion 38.

In the above-described reinforcing structure of the building 10, the reinforcing frame 31 in which the reinforcing braces 14 are arranged in a staggered pattern only in the upper layer and the internal reinforcing frame 32 located in the lower layer of the building 10 are arranged. Configuration. In such a configuration, when a horizontal external force is applied due to an earthquake or the like, the axial force distribution in the upper layer of the reinforcing frame 31 is the same as that in the second embodiment. The axial force acting on the inner reinforcing frame 32 from the reinforcing frame 31 is applied to the inner pillar 3 via the concrete portion 35 and the existing pillar 10a.
4. Further, in the internal reinforcing frame 32, the horizontal force is transmitted through the floor surface to the reinforcing brace (not shown) or the additionally struck wall (not shown). Thereby, the building 10 can be reinforced and the earthquake resistance can be improved. In this way, while improving the seismic resistance of the building 10, the building 1 is located in the lower part where there is an entrance.
A configuration without the reinforcing brace 14 on the side surface of 0 can create a space with an open feeling.

Further, in the underground part 10G of the building 10, only the internal reinforcing frame 32 continuous from the lower part is provided. By the way, for example, the reinforcing frame 1 shown in the first and second embodiments
Naturally, in the bases 1 and 21, they are also provided continuously in the underground part. In this case, however, they may interfere with the size of the land around the building 10 or the buried facility wiring and piping. In some cases. On the other hand, in the present embodiment, since the internal reinforcing frame 32 is provided inside the building 10 as described above, such a problem can be avoided.

In the third embodiment, the reinforcing column 12 of the reinforcing frame 31 is integrated with the existing column 10a by the concrete portion 35. However, the present invention is not limited to this. For example, as shown in FIG. 7A, only the inner pillars 34, 34 are integrated with the existing pillar 10a by the concrete portion 35 ', and the pillar 1 of the reinforcing frame 31 is formed.
2 may be exposed. Here, FIG.
Alternatively, the concrete portions 35, 35 'shown in FIG.
In this case, shear reinforcement is performed as necessary, but this involves winding an iron plate around the outer peripheral surface, winding carbon fiber or a sheet made of carbon fiber, embedding a hoop-shaped reinforcing bar, or incorporating a hoop bar. Or displaced precast concrete boards.

As for the internal reinforcing frame 32,
The configuration is not limited at all, and if the lower layer of the building 10 can be reinforced without using the braces 14, for example, as shown in FIG. Another reinforcing structure may be used, for example, a structure in which the concrete 39b is additionally struck.

In addition, the reinforcing frame 31 is gradually raised from the center to the side end. However, if the reinforcing braces 14 are arranged in a staggered manner, the reinforcing frame of the first embodiment may be used. 11 (see FIG. 1), the building 10
A configuration in which the entire side surface of the upper layer portion is disposed may be employed.

In the second and third embodiments, the reinforcing brace 14 is constituted by, for example, an X-shaped brace. However, the brace type is not limited, and another type such as a K-shaped brace may be employed. You may.

[Fourth Embodiment] Next, a second embodiment of the building reinforcement structure according to the present invention will be described. Here, a description will be given using an example in which the reinforcing frame provided in the building is made of reinforced concrete. In the following description, the same components as those in the first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 8, the existing building 10 has
In order to reinforce this, reinforcing frames 41 made of reinforced concrete are provided on the four outer peripheral surfaces.

The reinforcing frame 41 is configured to gradually increase from the center of the building 10 to the side end, and is provided at the side end to the top floor, and at the center to the fourth floor, for example. Is provided. The reinforcing frame 41 is made up of reinforced concrete earthquake-resistant wall panels (reinforcing wall portions) 42, 42,. Each earthquake-resistant wall panel 42 has, for example, an opening 42a at the center thereof.
Are formed. The two earthquake-resistant wall panels 42 are arranged in pairs, and they are arranged in a staggered manner on the side surface of the building 10. That is, a pair of two earthquake-resistant wall panels 42, 42 are provided at the top of the side end portion of the building 10, and the other earthquake-resistant wall panels 42, 42 are provided so as to be adjacent to each other in an oblique direction based on this. Have been. In the present embodiment, the earthquake-resistant wall panels 42, 42 are symmetrically arranged, and in the center of the building 10, the earthquake-resistant wall panels 42, 42 are arranged adjacent to each other on the left and right.

In the above-described reinforcing structure of the building 10, a reinforcing frame 41 is provided on an outer surface thereof, and the reinforcing frame 41 is configured such that the earthquake-resistant wall panels 42, 42 are arranged in a staggered manner. Thereby, the same effect as in the second embodiment can be obtained.

In the fourth embodiment, the reinforcing frame 41 is provided up to the lower layer of the building 10. However, as shown in FIG. A reinforcement frame 51 composed of the earthquake-resistant wall panels 42, 42 may be provided only in the upper layer, and an internal reinforcement frame 52 may be provided inside the building 10 in the lower layer. Thereby, the same effect as the reinforcing structure of the building 10 in the third embodiment can be obtained.

Regarding the reinforcing frame 41, any method of casting in place or precasting may be applied.

In the first to fourth embodiments, the reinforcing frames 11, 21, 31, 41, 51 are provided on the entire periphery of the building 10. For example, the building to be reinforced is rectangular in plan view. For example, when the influence of the horizontal external force is directional, for example, the configuration may be provided only on two surfaces located along the lateral direction of the building. Further, for example, for each side surface in one building, such as a side surface with an entrance and an inner surface, or a side surface extending in a longitudinal direction and a side surface extending in a lateral direction in a rectangular building in a plan view, the first to the second side Reinforcement frames 11 and 12 shown in the fourth embodiment
1, 31, 41, and 51 may be provided in combination. In addition, it goes without saying that the shape of the building to be applied is not limited at all.

[0047]

As described above, according to the reinforcing structure for a building according to the first aspect, a steel frame is provided on the outer surface of the building, and the reinforcing frame extends in the vertical direction. A reinforcing column, a reinforcing beam extending in the horizontal direction, and a reinforcing brace erected between the reinforcing column and the reinforcing beam, and the reinforcing braces are arranged in a staggered manner adjacent to each other in a diagonal direction. did. According to the reinforcing structure for a building according to claim 2, a reinforcing frame made of reinforced concrete is provided on the outer surface of the building, and the reinforcing frames are combined by arranging rectangular reinforcing walls in a staggered manner. The configuration was adopted. Thereby, when a large horizontal external force due to an earthquake or the like is applied, the axial force acting on the column located at the side end of the building can be greatly reduced as compared with the conventional building reinforcement structure. Furthermore, the difference in the axial load between the side ends and the center of the building can be reduced as compared with the conventional case,
In particular, wasteful strength at the center can be reduced. In this way, the reinforcing frame made of steel frame or reinforced concrete can efficiently bear the horizontal external force and improve the earthquake resistance of the building. In addition, since the reinforcing frame is provided on the outer side surface of the building, the construction can be performed while using the inside of the building.

According to the reinforcing structure for a building according to claim 3,
The reinforcing frame is configured to gradually increase from the center of the building toward the side end. In this way, by increasing the reinforcing frame at the side end where a large axial force is applied, and lowering the reinforcing frame at the center where the acting axial force is small,
The reinforcing frame can be made to match the distribution of the axial force, and the reinforcing frame can more efficiently bear the horizontal external force and improve the earthquake resistance of the building.

According to the structure for reinforcing a building according to claim 4,
The reinforcing brace of the reinforcing frame is provided only in the upper layer of the building, and the lower layer of the building is provided with an internal reinforcing frame located inside the building. Thus, the reinforcement brace can be configured such that the reinforcement braces are not exposed on the side of the building in the lower layer portion having the entrance and the like, while the entire building is reinforced, and a space with a sense of openness can be created.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a building reinforcement structure according to the present invention, and is an elevation view showing an example of a building reinforced by applying the reinforcement structure.

FIG. 2 is a model diagram showing an axial force distribution in the building shown in FIG.

FIG. 3 is a view showing a first embodiment of a building reinforcement structure according to the present invention, and is an elevation view showing another example of a building reinforced by applying the reinforcement structure.

FIG. 4 is a view showing a second embodiment of the building reinforcement structure according to the present invention, and is an elevation view showing an example of a building reinforced by applying the reinforcement structure.

FIG. 5 is an elevation view showing an example of a building reinforced by applying the reinforcing structure.

6 is a plan sectional view showing a part of the building shown in FIG.

FIG. 7 is a view showing a third embodiment of a building reinforcement structure according to the present invention, and is an elevation view showing another example of a building reinforced by applying the reinforcement structure.

FIG. 8 is a diagram showing a fourth embodiment of the building reinforcement structure according to the present invention, and is an elevation view showing an example of a building reinforced by applying the reinforcement structure.

FIG. 9 is an elevation view showing another example of a building reinforced by applying the reinforcing structure.

FIG. 10 is a vertical sectional view showing an example of a conventional building reinforcing structure.

FIG. 11 is an elevational sectional view showing another example of a conventional building reinforcing structure.

12 is a model diagram showing an axial force distribution in the building shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Building 11,21,31,41,51 Reinforcement frame 12 Reinforcement pillar 13 Reinforcement beam 14 Reinforcement brace 42 Earthquake-resistant wall panel 52 Internal reinforcement frame

Claims (4)

[Claims] 1. A reinforcing frame made of steel is provided on an outer surface of a building. The reinforcing frame includes a reinforcing column extending in a vertical direction, a reinforcing beam extending in a horizontal direction, and a reinforcing column. And a reinforcing brace provided between the reinforcing beam and the reinforcing beam, wherein the reinforcing braces are arranged in a staggered manner adjacent to each other in an oblique direction. 2. A reinforcing frame made of reinforced concrete is provided on the outer surface of the building, and the reinforcing frame is configured by combining rectangular reinforcing walls, and the reinforcing walls are oblique to each other. Reinforcement structure of a building characterized by being arranged in an adjacent staggered pattern. 3. The reinforcing structure for a building according to claim 1, wherein the reinforcing frame gradually increases from a center of the building toward a side end of the building. Reinforcement structure. 4. The reinforcing structure for a building according to claim 1, wherein the reinforcing brace of the reinforcing frame is provided only in an upper layer of the building, and the lower layer of the building is provided in a lower layer of the building. A structure for reinforcing a building, wherein an internal reinforcing frame located inside the building is provided.