JP3690437B2 - Seismic reinforcement structure for existing buildings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for improving the earthquake resistance of an existing building.
[0002]
[Prior art]
In recent years, more and more earthquake resistance has been required for buildings, and it is natural that new buildings will be more fully considered for earthquake resistance than ever before. It has become. However, existing buildings that have been built in the past and are still in use are still considered to have sufficient earthquake resistance at the time of construction, even if they are currently considered to be a problem. There is also a need to reinforce such existing buildings to improve earthquake resistance.
[0003]
Examples of reinforcement measures that have been implemented to improve earthquake resistance for existing buildings include the addition of earthquake-resistant walls, the establishment of new braces with frames, the winding of steel plates or carbon around pillars, and the addition of concrete. .
By the way, since all these reinforcing means are renovation work inside the building, it is very difficult to carry out the renovation work while using the existing building as usual. In addition, when it is carried out while being used, the time for carrying out the construction is limited to nights and holidays and the construction period is prolonged.
Therefore, a steel frame external frame is constructed in the vicinity of the existing building, and a reinforcing means for supporting the existing building from the outside by this external frame has been studied. If this reinforcement means is adopted, reinforcement work can be carried out without affecting the use system of existing buildings.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned reinforcing means, the external frame becomes enormous in accordance with the existing building, so that the rigidity of the external frame tends to be low, and the existing building has a high rigidity structure such as RC or SRC structure. There was a possibility that the reinforcing effect could not be sufficiently exhibited.
[0005]
The present invention has been made in view of the above circumstances, and can carry out reinforcement work without affecting the use system of existing buildings, and dramatically improve the earthquake resistance of the existing buildings after completion. The purpose is to provide a seismic reinforcement structure for existing buildings.
[0006]
[Means for Solving the Problems]
As a means to solve the above-mentioned problems, an auxiliary pillar is erected in the vicinity of an existing pillar that constitutes an existing building, and an external frame including this auxiliary pillar is constructed adjacent to the existing building. The existing pillars and the supporting pillars are connected with anchors at intervals, and reinforcement is provided around the supporting pillars, and concrete is placed and filled around the supporting pillars and the spaces of the pillars and the supporting pillars. By adopting this method, the existing pillars and supporting pillars will be integrated to increase the number of pillars, and the seismic reinforcement structure for existing buildings will be adopted.
According to the seismic reinforcement structure of the existing building, by integrating the existing column and the supporting column, a three-dimensional reinforcement effect is created between the existing building and the external frame, and the earthquake resistance of the existing building is improved. .
[0007]
In addition, erection beams are installed near the existing beams that make up the existing building between the supporting columns of the external frame, the existing beams and the linking beams are connected by anchors, and concrete is placed between these beams. By installing and filling and integrating the existing beam and the auxiliary beam, the transmission performance of the horizontal force between the existing building and the external frame increases, and the seismic reinforcement effect of the existing building is further improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the seismic reinforcement structure for an existing building according to the present invention will be described with reference to FIGS.
The existing building 1 shown in FIGS. 1 and 2 is a steel-framed reinforced concrete structure built on the ground G. The existing building 1 has a gate shape so that the existing building 1 is arranged inside. The external frame 10 is constructed in close proximity.
[0009]
The external frame 10 is constructed on a foundation 12 that is integrated with the foundation 2 of the existing building 1. It has a truss structure constituted by a steel beam 14 and a brace 15 installed between the beam 13 and the beam 14. The external frame 10 having this steel truss structure is erected along both side wall surfaces of the existing building 1 and is further laid so as to straddle the roof of the existing building 1 to form a gate shape.
[0010]
As shown in FIG. 3, the foundation 12 of the external frame 10 is constructed on a foundation pile 12 a placed in the ground, and an anchor 12 b installed in a state protruding from the foundation 2 of the existing building 1 is provided. It is built in a buried state and integrated with the foundation 2.
[0011]
The accessory pillar 13 is made of H-shaped steel, is erected on the foundation 12 with an interval, and is arranged close to each of the existing pillars 3 constituting the existing building 1.
[0012]
As shown in FIGS. 4 and 5, a plurality of anchors 20 are installed between the existing pillars 3 and the auxiliary pillars 13 arranged close to each other. These anchors 20 are arranged in parallel in the height direction of the columns 3, that is, in the vertical direction, and the columns 3 and the supporting columns 13 are connected by these anchors 20.
One end of the anchor 20 is inserted into a hole formed in the column 3 and bonded thereto, and the other end is installed in a state of protruding toward the accessory column 13. The other end of the anchor 20 is fixed to the flange of the column 3 with a nut.
[0013]
Further, bar arrangement (not shown) is provided around the supporting pillar 13, and the space between the supporting pillar 13 and the pillar 3 connected by the anchor 20 and the supporting pillar 13 is cast and filled with concrete, The pillar 3 and the accessory pillar 13 are integrated and the pillar 3 is increased.
[0014]
The beam 14 is made of H-shaped steel like the beam 13 and is installed between the adjacent beam 13 and adjacent to the existing beams 4 constituting the existing building 1 so as to be close to each other. Has been placed.
[0015]
As shown in FIGS. 4 and 5, a plurality of anchors 30 are installed on the adjacently arranged beam 4 and accessory beam 14 so as to protrude toward the other beam.
These anchors 30 are juxtaposed at intervals in the length direction of each beam, that is, in the horizontal direction. Among these anchors, those installed on the beam 4 are inserted into holes formed in the beam 4 and then installed. Those attached to the beam 14 are fixed to the flange of the beam 14 with nuts.
[0016]
The anchors 30 are alternately arranged in such a manner that the anchors 30 installed on one beam protrude from the anchors 30 installed on the other beam. The beam 4 and the beam 14 are connected to each other after a spiral bar 31 for preventing splitting between them is fitted along the length of the beam.
[0017]
Furthermore, in the space between the connected beam 4 and the beam 14, concrete is cast and filled, and the anchor 30 and the spiral bar 31 are embedded in the concrete, and the beam 4 and the beam 14 are integrated. It has become a state.
[0018]
When comparing the horizontal rigidity of the existing building 1 having the external frame 10 configured as described above with the state before the external frame 10 is constructed, as shown in FIG. And the horizontal force of the existing building 1 is smoothly transmitted to the external frame 10 by each shaft member between C and D. Regarding the Y direction component, the shaft rigidity is improved by the shaft members between a and b and between c and d.
[0019]
That is, in the existing building 1 in which the external frame 10 is constructed, the existing column 3 and the auxiliary column 13, and the existing beam 4 and the auxiliary beam 14 are integrated, thereby the steel frame truss structure of the external frame 10. Since the rigidity is increased and a three-dimensional reinforcement effect is generated between the existing building 1 and the external frame 10 to be reinforced, the shaft rigidity of each shaft member constituting the external frame 10 is increased by the existing building 1, and the external frame Since the load factor of 10 is improved, the earthquake resistance of the existing building 1 is significantly improved.
Moreover, since the renovation work inside the existing building 1 is hardly required, the use system of the existing building 1 is not affected. Therefore, the period required for the reinforcement work can be shortened.
[0020]
In addition, the shape of the external frame 10 in this embodiment is an example, and it is needless to say that the external frame 10 is constructed in various shapes depending on conditions such as the shape of an existing building to be reinforced and required reinforcement strength. .
In addition, when the interval between the existing frame and the external frame is wide as in the present embodiment, it is effective to fill the concrete between them, but the interval between the existing frame and the external frame is narrow, and the concrete filling property Is inferior, for example, it is effective to fill non-shrink mortar, resin mortar, and mortar mixed with epoxy resin.
Furthermore, a stud bolt may be employed instead of the anchors 20 and 30.
[0021]
【The invention's effect】
As described above, according to the earthquake-proof reinforcement structure for an existing building described in claim 1, the pillar of the existing building and the accessory pillar that forms a part of the external frame are connected by the anchor with a space therebetween. Reinforcing bars around the supporting pillars, and placing and filling concrete around the supporting pillars and the space of the pillars and the supporting pillars, the existing pillars and the supporting pillars are integrated to increase the number of pillars , This increases the rigidity of the external frame and creates a three-dimensional reinforcement effect between the existing building and the external frame. The axial rigidity of each shaft member constituting the external frame is reinforced by the existing building. Greatly improves the earthquake resistance of existing buildings. Moreover, it does not require Dondo ho the renovation of internal existing buildings, a short period of time required for reinforcement work without affecting the use structure of the existing building.
[0022]
Further, according to the seismic reinforcement structure for an existing building described in claim 2, not only the existing pillar and the supporting pillar but also the beam of the existing building and the supporting beam forming a part of the external frame are connected by the anchor. At the same time, by placing concrete between these beams and filling them, the existing beams and the auxiliary beams are integrated, so that the axial force can be smoothly transmitted to the external frame, further improving the earthquake resistance of the existing building Can do.
[Brief description of the drawings]
FIG. 1 is a front view showing an existing building having an external frame as an embodiment of the seismic reinforcement structure for an existing building according to the present invention.
FIG. 2 is also a side view of an existing building having an external frame.
FIG. 3 is a side sectional view showing a basic portion of an external frame.
FIG. 4 is a side view showing a joined state between a pillar of an existing building and a supporting pillar of an external frame.
FIG. 5 is a plan view showing a joining state of a beam of an existing building and a beam of an external frame.
FIG. 6 is a plan view for explaining an improvement in transmission performance of an axial force in an existing building having an external frame.
[Explanation of symbols]
1 Existing Building 3 Existing Column 4 Existing Beam 10 External Frame 13 Side Pillar 14 Side Beam 20 and 30 Anchor G Ground

Claims (2)

A reinforcing structure for improving the earthquake resistance of an existing building, where an existing external structure is installed in the vicinity of an existing pillar that constitutes the existing building and a part of the auxiliary pillar. It is constructed adjacent to the building, and these existing pillars and accessory pillars are connected with anchors at intervals, and reinforcement is provided around the accessory pillars, and the surroundings of the accessory pillars and the spaces of the pillars and accessory pillars. An anti- seismic reinforcement structure for an existing building , wherein the pillars and the accessory pillars are integrated by placing concrete into the wall, and the pillars are added .    The seismic reinforcement structure for an existing building according to claim 1, wherein a supporting beam is installed between the supporting pillars in the vicinity of the existing beams constituting the existing building, and the existing beams and the supporting beams are installed. An earthquake-proof reinforcing structure for an existing building, which is constructed by connecting and connecting with anchors and placing and filling concrete between the beams.

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