JP2001020533A - Seismic reinforcement structure of existing building - Google Patents

Abstract

(57) [Summary] [Problem] To provide a seismic retrofit structure for an existing building that reliably improves the rigidity and strength of the existing building without impairing the comfort of the living space, such as traffic lines, lighting, and ventilation. A reinforcing member is provided on a construction surface (5) surrounded by an existing pillar (2), an upper surface (floor surface) of a lower existing beam (4), and a lower surface (ceiling surface) of an upper existing beam (4). Sleeve walls 6 and 8 are provided. One reinforcing sleeve wall 6 has a large number of rectangular openings 6.
a is a reinforced concrete wall, and the other reinforcing sleeve wall 8 is also a reinforced concrete wall provided with a plurality of rectangular openings 8a. In order to form these reinforced concrete sleeve walls for reinforcement, a plurality of anchors 10 are driven into existing columns and existing beams, and a reinforcement 1 for sleeve walls is attached to these anchors.
2 are arranged longitudinally and laterally, a rectangular tubular body is arranged at the position where the openings 6a and 8a are formed, and after forming the formwork on both outer sides of the rebar for the sleeve wall along the construction surface, between the formwork. Pour concrete. Then, when the mold and the cylinder are removed after the concrete has hardened, the reinforcing sleeve walls 6 and 8 in contact with the existing column 2 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic retrofit structure for an existing building.

[0002]

2. Description of the Related Art As a method of retrofitting an existing building, a method of newly installing an earthquake-resistant wall or a brace in a room,
A method of wrapping steel columns or carbon fiber sheets around columns to give them toughness, a method of adding concrete to walls or columns,
As in the method described in Japanese Patent Application Laid-Open No. 09-287298, a method is known in which a large number of seismic blocks are joined to each other while providing ventilation and light permeability to a surface surrounded by columns and beams. I have.

[0003]

However, in the above method, a part of the living space is closed, which affects a flow line for a person to pass through, so that the plan is often changed. . According to the method described above, the deformation performance can be improved, but the rigidity and proof stress do not increase so much.

In the method (1), it is necessary to enlarge the concrete section in order to increase the rigidity, so that the interior space may be narrowed. In addition, a large amount of anchor rebars must be hit to integrate with the existing columns and beams. This would be a major undertaking. Furthermore, according to the method (1), the construction can be performed in a shorter construction period than the methods (1) to (4), but the problem of the flow line cannot be solved.

The present invention has been made in view of the above circumstances, and is capable of reliably improving the rigidity and strength of an existing building without impairing the comfort of a living space such as traffic lines, lighting, and ventilation. It aims to provide a seismic reinforcement structure for buildings.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, an earthquake-resistant reinforcing structure for an existing building according to the present invention transmits light to a part of a construction surface surrounded by columns and beams of the existing building, Alternatively, a reinforcing sleeve wall having a plurality of openings through which the wind passes is arranged, and when a horizontal external force is input to the column due to an earthquake or the like, a compressive force exceeding a yield strength, a shearing force, or the like is applied to the reinforcing sleeve wall. The reinforcing sleeve wall acts on the wall and breaks before the pillar. The reinforcing sleeve wall may be disposed in contact with the pillar, or may be disposed on a part of the structure without contacting the pillar.

[0007] According to this structure, the horizontal rigidity of the pillar can be greatly improved, and the existing building can be surely reinforced.
When horizontal external force due to an earthquake or the like is input to the column, the reinforcing sleeve wall breaks before the column and absorbs seismic energy.
The reinforcing sleeve wall can impart toughness to the column having a reduced shear span ratio, and can prevent shear failure by horizontally restraining the column.

[0008] Further, even after seismic retrofitting, sufficient flow lines in the living space can be ensured, and the ventilation holes and light transmittance in the room are improved by the openings provided in the reinforcing sleeve walls. Nature can be secured. Also,
By changing the shape, size, arrangement, and the like of the opening, the sleeve wall can have a design property. Here, the sleeve wall for reinforcement
With a structure including a wall provided with a plurality of openings and an additional column integrally provided on the side of the wall, the additional column can improve the compressive strength of the column.

[0009] Further, a reinforcing sleeve wall is formed by connecting a plurality of seismic blocks to form an opening, an additional concrete part integrally connecting the wall to a pillar and a beam, and a side part of the wall. When the structure is equipped with additional pillars that are provided integrally with the building, the seismic block is a lightweight member, which makes it easy to carry in, lift, and attach work to the upper floors, greatly shortening the period of seismic reinforcement work. Can be.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a seismic retrofit structure of an existing building according to a first embodiment of the present invention. In this embodiment, the existing pillar 2 is in contact with the existing pillar 2 on the construction surface 5 surrounded by the upper surface (floor surface) of the lower existing beam 4 and the lower surface (ceiling surface) of the upper existing beam 4. With reinforcement sleeve wall 6,
8 are provided. The existing columns 2 and the existing beams 4 are members made of reinforced concrete or steel reinforced concrete.

The one reinforcing sleeve wall 6 is a reinforced concrete wall provided with a large number of rectangular openings 6a, and the other reinforcing sleeve wall 8 also has a plurality of rectangular openings 8a.
This is a reinforced concrete wall provided with. Then, in order to form the reinforced concrete reinforcing sleeve walls 6 and 8, a plurality of anchors 10 are driven into the existing columns 2 and the existing beams 4, and the sleeve wall reinforcing bars 12 are arranged vertically and horizontally on these anchors 10. A rectangular cylindrical body is arranged at the position where the openings 6a and 8a are formed, and a formwork (not shown) is arranged on both outer sides of the rebar for the sleeve wall along the construction surface, and then concrete is struck between the forms. Set up. Then, when the mold and the cylinder are removed after the concrete has hardened, the reinforcing sleeve walls 6 and 8 that are in contact with the existing column 2 are formed.

According to the structure having the reinforcing sleeve walls 6 and 8, the horizontal rigidity of the existing column 2 can be greatly improved. In addition, even after the seismic reinforcement, the traffic lines in the living space can be sufficiently secured. Further, the openings 6a and 8a provided in the reinforcing sleeve walls 6 and 8 improve the ventilation and light transmittance in the room. Therefore, the earthquake resistance of the existing building can be improved without impairing the comfort of the living space.

[0013] Here, the shear strength of the existing column 2 greatly affects the habitability and the earthquake resistance when the shear span ratio (ratio between bending moment and shear force) changes. That is, assuming that the allowable bending moment of the existing column 2 is M and the shearing force of the existing column 2 when the reinforcing sleeve walls 6 and 8 are not provided is Qd, the shearing force when the reinforcing sleeve walls 6 and 8 are not provided. The span ratio δ is as follows: δ = M / Qd (1)

Further, seismic reinforcement was performed (reinforcement sleeve wall 6,
8), the shear force Qd 'of the existing column 2 shows a value larger than the shear force Qd (Qd'> Qd).
Thus, the shear span ratio δ ′ when the reinforcing sleeve walls 6 and 8 are provided is as follows: δ ′ = M / Qd ′ (2) δ ′ <δ (3) Therefore, the shear span ratio δ ′ when the reinforcing sleeve walls 6 and 8 are provided is smaller than the shear span ratio δ when the reinforcing sleeve walls 6 and 8 are not provided, and the rigidity and proof stress increase. However, there is a possibility that the existing column 2 may be sheared at an early stage.

In this embodiment, when a horizontal external force (in the direction of the arrow in FIG. 1) due to an earthquake or the like is input to the existing column 2,
According to the assumption of flatness, the reinforcing sleeve walls 6 and 8 which are close to the compression or tension edges in cross section cause shear failure or bending failure before the existing column 2 and absorb seismic energy. Also,
By providing openings 6a, 8a in the reinforcing sleeve walls 6, 8, the overall rigidity and proof stress are adjusted, and the existing column 2 is prevented from being damaged. As a result, the reinforcing sleeve walls 6, 8 can impart toughness to the existing column 2 having a reduced shear span ratio, and prevent the brittle shear failure by restraining the existing column 2 horizontally. can do.

In this embodiment, the sleeve walls 6 and 8 for reinforcement are used.
Is provided with a rectangular opening 6a, but even if a plurality of circular or triangular openings are provided, the same operation and effect can be obtained. Next, what is shown in FIG. 3 and FIG.
It shows an earthquake-resistant reinforcement structure of an existing building according to a second embodiment of the present invention. The same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a reinforcing sleeve wall 14 is provided in the construction surface 5 in contact with the existing pillar 2, and the reinforcing sleeve wall 14 has a large number of rectangular openings 16a. This is a reinforced concrete wall provided with a reinforced concrete wall portion 16 and an additional pillar 18 provided integrally with a side portion of the wall portion 16. The reinforcement sleeve wall 14 drives a plurality of anchors 10 into the existing column 2 and the existing beam 4, and arranges reinforcement columns 20 and wall reinforcing bars 22 on the anchors 10 vertically and horizontally to form openings 16 a. A rectangular cylindrical body is arranged at a position where the form is to be formed, and a formwork (not shown) is arranged on both outer sides of the reinforcing pillar reinforcement 20 and the wall reinforcement 22 along the construction surface, and then concrete is struck between the forms. Set up. Then, when the mold and the cylinder are removed after the concrete has hardened, the reinforcing sleeve wall 1 in contact with the existing column 2 is removed.
4 are formed.

According to the structure provided with these reinforcing sleeve walls 14, the horizontal rigidity of the existing column 2 is greatly improved, and the provision of the additional column 18 can also improve the compressive strength of the existing column 2. In addition, a flow line in the living space can be secured, and the opening 16 provided in the sleeve wall 14 for reinforcement is provided.
The air permeability and light transmittance in the room are improved by a, and the earthquake resistance of the existing building can be improved without impairing the comfort of the living space.

Further, in the present embodiment, even if a horizontal external force (in the direction of the arrow in FIG. 3) due to an earthquake or the like is input to the existing column 2,
Since compressive force, tensile force, and shear force exceeding the yield strength act on the reinforcing sleeve wall 14, the reinforcing sleeve wall 14 causes shear failure or bending failure before the existing column 2 and absorbs seismic energy. The reinforcing sleeve wall 14 can impart toughness to the existing column 2 having a reduced shear span ratio, and can restrain the existing column 2 horizontally to prevent shear failure.

Next, FIGS. 5 and 6 show a third embodiment of an earthquake-resistant reinforcement structure for an existing building according to the present invention. Also in this embodiment, the same components as those of the second embodiment shown in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, a reinforcing sleeve wall 24 is provided in the construction surface 5 in contact with the existing column 2.

The reinforcing sleeve wall 24 includes a wall portion 26 composed of a plurality of seismic blocks 26a and 26b, an additional concrete portion 28 integrally connecting the wall portion 26 to the existing column 2 and the existing beam 4, and a wall portion. Extension column 30 integrally provided on the side of 26
And a wall with The seismic block 26b is a member provided with connecting portions at both ends in the longitudinal direction of a rectangular parallelepiped precast concrete portion, such as a member described in JP-A-09-287298. Also, the seismic block 26
a is formed by cast-in-place using non-shrink mortar or concrete with high fluidity, and is connected on site so that the earthquake-resistant blocks 26b form a lattice shape.

Also, a plurality of anchors 10 are driven into the existing columns 2 and the existing beams 4, and rail-shaped hardware (not shown) is attached to these anchors 10 along the existing columns 2 and the existing beams 4.
Has been fixed. Then, the outer end of the seismic block 26b is connected to the rail-shaped metal, a formwork is arranged so as to surround the anchor 10 and the rail-shaped metal, and concrete is poured between them and hardened. Seismic block 26
An additional concrete portion 28 is formed in which the end of b is integrated with the existing column 2 and the existing beam 4. In addition, a reinforcing bar is provided inside the additional concrete portion 28.

The extension column 30 is provided with a reinforcement bar 30a for the extension column.
When the concrete is placed between the molds after the molds are arranged in the vertical direction and the molds are arranged around them, the concrete is formed by hardening of the concrete. A rectangular or triangular opening 26c is formed between the earthquake-resistant block 26b of the wall 26, the additional concrete part 28, and the additional pillar 30.

According to the structure having the reinforcing sleeve wall 24, the horizontal rigidity of the existing column 2 is greatly improved as in the second embodiment, and the additional column 30 is provided to compress the existing column 2. The proof stress can also be improved. In addition, the flow line in the living space can be secured, and the ventilation and light transmission in the room are improved by the opening 26c provided in the wall 26, and the seismic resistance of the existing building is improved without impairing the comfort of the living space Can be done.

Further, in the present embodiment, even if a horizontal external force (in the direction of the arrow in FIG. 5) due to an earthquake or the like is input to the existing column 2,
A compressive force, a tensile force, and a shear force exceeding the yield strength act on the reinforcing sleeve 24, and the reinforcing sleeve 24 causes shear failure or bending failure before the existing column 2 and absorbs seismic energy. The reinforcing sleeve wall 24 imparts toughness to the existing column 2 having a reduced shear span ratio and restrains the existing column 2 horizontally, thereby preventing shear failure.

The unique effect of the present embodiment is that, since the wall portion 26 is provided with the precast seismic block 26b, the amount of concrete to be cast on site is greatly reduced, and the seismic block 26b is lightweight. Because it is a member
Loading into the upper floor, lifting work, and installation work become easy.
Therefore, the period of the seismic retrofitting work can be significantly reduced.

Next, FIGS. 7 and 8 show the seismic reinforcement structure of an existing building according to the fourth embodiment. In these embodiments, the seismic block 26b constituting the wall 26 is buried in concrete, and a circular concrete opening 36 is formed by arranging a circular cylindrical formwork.

By adopting such a structure, the same function and effect as those of the third embodiment can be obtained, and a reinforcing sleeve wall excellent in design can be provided. Further, FIG. 9 shows a seismic retrofit structure of an existing building according to the fifth embodiment. In the present embodiment, a reinforcing sleeve wall 34 is provided in the construction surface 5 without being in contact with the existing column 2.

The reinforcing sleeve wall 34 includes a wall 26 formed by connecting a plurality of seismic blocks 26 b disposed at the center of the construction surface 5, and an additional concrete structure in which the wall 26 is integrally connected to the existing beam 4. The wall has a portion 28 and additional columns 30 provided integrally on both sides of the wall portion 26. By adopting such a structure, the same operation and effect as in the third embodiment can be obtained, the flow line of the living space can be more freely secured, and the ventilation and light transmittance in the room are further improved. Space comfort can be improved.

[0030]

As described above, according to the seismic reinforcement structure for an existing building of the present invention, the horizontal rigidity of the pillar can be greatly improved, and the existing building can be reliably reinforced. Also,
When horizontal external force due to an earthquake or the like is input to the column, the reinforcing sleeve wall breaks before the column and absorbs seismic energy.
The reinforcing sleeve wall can impart toughness to the column having a reduced shear span ratio, and can prevent shear failure by horizontally restraining the column.

Further, even after the seismic retrofitting, sufficient flow lines in the living space can be ensured, and the ventilation holes and light transmittance in the room are improved by the openings provided in the reinforcing sleeve walls, so that the comfort of the living space can be improved. Nature can be secured. Further, by changing the shape, size, arrangement, and the like of the openings, the sleeve wall can be given a design.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of an earthquake-resistant reinforcement structure for an existing building according to the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a side view showing a second embodiment of the earthquake-resistant reinforcement structure of an existing building.

FIG. 4 is a view taken along the line IV-IV in FIG. 3;

FIG. 5 is a side view showing a third embodiment of the seismic retrofit structure of an existing building.

FIG. 6 is a view taken along line VI-VI of FIG. 5;

FIG. 7 is a side view showing an example of a fourth embodiment of a seismic retrofit structure of an existing building.

FIG. 8 is a side view showing another example of the fourth embodiment of the seismic retrofit structure of an existing building.

FIG. 9 is a side view showing a fifth embodiment of the seismic retrofit structure of an existing building.

[Explanation of symbols]

 2 Pillar (existing pillar) 4 Beam (existing beam) 5 Construction surface 6, 8, 14, 24, 34 Reinforcing sleeve wall 6a, 16a, 26c Opening 10 Anchor 16, 26 Wall 18, 30 Extension pillar 28 Extension concrete Department

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shunshi Soka 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Kazuhiro Kaneda 25-1, Nishishinjuku, Shinjuku-ku, Tokyo No. Taisei Construction Co., Ltd. (72) Inventor Eiji Ishii 1-25-1, Nishi Shinjuku, Shinjuku-ku, Tokyo F-term (reference) 2E176 AA01 BB28

Claims (1)

[Claims] 1. A reinforcing sleeve wall having a plurality of openings through which light can pass or wind passes is disposed on a part of a construction surface surrounded by columns and beams of an existing building. When a horizontal external force is applied to the column, a compressive force exceeding the yield strength, a shearing force or the like acts on the reinforcing sleeve wall, and the reinforcing sleeve wall is broken before the column. The feature is the seismic retrofit structure of the existing building.