JP3407728B2 - Seismic reinforcement structure of existing structures - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic reinforcement structure for an existing structure, which seismically strengthens the existing structure while it is in use.

[0002]

[Prior Art and Problems to be Solved by the Invention] Buildings built before 1981 before the implementation of new seismic design standards are often lacking in seismic performance according to the same standards. It is often determined that reinforcement is necessary.

In this case, some kind of seismic reinforcement is required to keep the building alive, but if the building is in use, the pillars and the inside of the building will be used unless business or living in the building is interrupted. Since it is not possible to carry out seismic reinforcement by reinforcing beams, seismic walls, etc., in order to perform seismic reinforcement of a building while continuing operations inside the building, there is no choice but to perform seismic reinforcement from outside the building.

Since it is necessary to ensure seismic performance in two horizontal directions in order to retrofit an existing building, for example, when the building has a rectangular planar shape, the two corners on the plane of the building are usually arranged in two directions. Although a reinforcing frame will be constructed, the existing appearance will be damaged in two directions as a result, so if you want to keep the appearance of at least one of the surfaces for design reasons, the reinforcing frame will be installed in two directions. The method of constructing is not suitable.

As a method for seismically strengthening an existing building from the outside while keeping the appearance of at least one construction surface, a method of reinforcing the opposing construction surface itself shown in FIG. 9 and a brace on the outside of the construction surface shown in FIG. How to construct a reinforced frame, diagram
A method to seismically isolate the entire building shown in Fig. 11 can be considered.

In the method (1), since the structure to resist the seismic force is obtained by the outer wall to be reinforced and the reinforcing frame to be added, it is necessary to arrange the reinforcing frame also in the direction orthogonal to the frame to be reinforced. However, if sufficient space is not secured in the direction orthogonal to the outside of the reinforced structure, a new earthquake resistant wall must be installed inside the building,
The new seismic wall will impose restrictions on the plan of the building after reinforcement.

Even if the method of (3) is used, if the reinforcing frame is a three-dimensional frame, it is possible to give a certain amount of resistance in the direction orthogonal to the reinforcing frame. it can.

According to the method of 1, the seismic force is absorbed by the seismic isolation layer, which has the advantage that the existing appearance does not have to be changed, and it is not necessary to newly install a seismic wall inside the building, but the outer periphery of the underground part It is necessary to form a clearance to allow relative displacement between the building and the ground, and the floor area of the underground part decreases by the amount of the clearance. Further, there arises a problem that it is necessary to make equipment pipes such as water supply / drainage pipes supplied to or discharged from the building follow the relative displacement.

In view of the above background, the present invention retains the existing appearance of any of the construction surfaces, and reduces the number of new earthquake-resistant walls inside the building by the method of (1), while at the same time, seismically-reinforced structure for externally reinforcing the existing building. Is proposed.

[0010]

In the present invention, the existing structure
An outer reinforcing frame of a three-dimensional frame is constructed as a pair on the outer side of one of the facing faces in two opposite directions. By installing a seismic control device in the direction, the number of newly installed internal reinforcement frames as earthquake resistant walls inside the building will be reduced.

Specifically, the external reinforcing frame is composed of a frame of a three-dimensional frame as described in claim 2 and a seismic resistant element which is arranged in at least a part of the frame in two horizontal directions and is relatively displaceable with respect to the frame. Between the seismic element and the frame,
Alternatively, a seismic control device is installed between seismic resistant elements that are separated from each other within the same frame. The frames of the three-dimensional frame of the external reinforcing frame face each other as described in claim 3,
It is composed of two or more sets of plane frames connected to each other, or a space truss or the like.

The seismic damping device is installed in the external reinforcing frame in two horizontal directions, so that a damping force is generated at the time of relative displacement between the external reinforcing frame and the seismic resistant element in the length direction of the external reinforcing frame and the direction orthogonal thereto. It absorbs the energy from the earthquake and reduces the horizontal two-direction seismic force that the external reinforcing frame must bear.

The seismic force in the two directions that the external reinforcing frame should bear is reduced by the vibration control device, and in particular, the seismic force in the direction orthogonal to the longitudinal direction of the external reinforcing frame (the thickness direction of the external reinforcing frame) is also reduced. As a result, the number of internal reinforcing frames to be installed as an earthquake resistant wall, which is newly required in the direction to compensate for the resistance force in the thickness direction of the external reinforcing frame, is reduced.

The internal reinforcing frame is partially constructed inside the existing structure in a direction orthogonal to the external reinforcing frame, and the vibration control device is incorporated in at least a part of the internal reinforcing frame. Specifically, the internal reinforcing frame in which the vibration control device is incorporated is defined in claim 4.
Part of the structure is separated from the existing structure as described in, and between the separated side and the structure,
Alternatively, a vibration control device is installed between the internal reinforcement frames on the separated side.

Since the seismic control device is incorporated into the internal reinforcing frame, the existing structure that is aseismically reinforced is subjected to seismic control of the external reinforcing frame and the internal reinforcing frame against seismic force in a direction orthogonal to the external reinforcing frame. The device reduces the seismic force and resists the external and internal reinforcing frames.

As a result, seismic force reducing effects are exerted by the seismic control devices incorporated in the external reinforcing frame and the internal reinforcing frame in the direction orthogonal to the external reinforcing frame. As shown in Figure 10- (b), the required number of internal reinforcement frames that should be placed in the direction orthogonal to the external reinforcement frame is required only when the external reinforcement frame as shown in Figure 10- (b) is used. Less than the number of installations required.

In addition, since the internal reinforcing frame itself has the effect of reducing the seismic force, the required number of internal reinforcing frames as earthquake resistant walls can be further reduced as compared with the case where no vibration control device is incorporated in the internal reinforcing frame. Therefore, the degree of freedom in the plan in the building after the reinforcement is increased.

Further, as described in claim 5, by incorporating a vibration control device in the outer reinforcing frame and the inner reinforcing frame centering on the middle layer or the top part of the existing structure where the amplitude during vibration becomes large, it is possible to efficiently control the vibration. Since the seismic force reduction effect of the seismic device is exerted, it is not always necessary to incorporate seismic resistant elements and seismic control devices over all layers and the entire length of the external reinforcing frame,
The degree of freedom in design of the structure of the existing structure to which the external reinforcement frame is added increases, and it is possible to secure the opening for entrance and exit to any floor such as the lower floor while adding the external reinforcement frame. Become. In this case, the construction cost required for seismic reinforcement is reduced compared to the case where seismic elements and damping devices are installed in all openings defined by the frame of the external reinforcement frame.

As described above, since the external reinforcing frame is composed of two or more sets of plane frames or space trusses, a space is formed between the opposing plane frames or between truss constituent members. It is possible to effectively use the newly installed external reinforcing frame as a storage space by, for example, storing various equipment units and the like in the space as described in (1). The equipment unit includes air conditioning equipment, electrical equipment, sanitary piping, disaster prevention equipment,
Includes evacuation stairs and other equipment.

Since the equipment units and the like can be stored in the external reinforcement frame, the equipment units placed inside the existing structure can be integrated into the external reinforcement frame, and at the same time as the seismic reinforcement of the existing structure, Since the internal equipment can be wiped out, as a result of the seismic retrofit, the degree of freedom in the plan in the building is further improved, and the degree of freedom in the equipment plan is also increased.

Further, as described in claim 7, a panel such as a glass or metal panel is housed on a surface in the longitudinal direction of the external reinforcing frame, that is, a surface parallel to the structural surface of an existing structure to which the external reinforcing frame is added. In this case, the outer wall surface can be protected and the radiant heat on the outer wall surface can be reduced, so that the life of the existing structure can be extended and the energy can be saved.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, as shown in FIGS. 1- (a) and 1- (b), an external reinforcing frame 2 of a three-dimensional frame is constructed on the outside of the facing structure of an existing structure 1, and The existing structure 1 is earthquake-proof reinforced by partially constructing an internal reinforcing frame 7 inside the object 1 in a direction orthogonal to the external reinforcing frame 2.

As shown in FIG. 1- (b), the external reinforcing frames 2 and 2 are arranged in pairs in either of the facing directions of the existing structure 1 facing each other in two directions. The structure is constructed with the length and height required for seismic reinforcement in the direction parallel to the existing structure, and part of the seismic force that the existing structure 1 should bear is transmitted to the external reinforcement frame 2. The structure 1a such as columns, beams and slabs of the existing structure 1 at the position required for
Connected to. External reinforcement frame 2 and frame 1a of existing structure 1
In addition to being directly connected, they are also indirectly connected via a vibration control device.

The external reinforcing frame 2 is, for example, a space truss frame,
Alternatively, as shown in the figure, it is constructed as a three-dimensional frame from two or more sets of plane frames 3 and 3 facing each other in the direction orthogonal to the plane to which it is added, and a connecting member 4 connecting the plane frames 3 and 3 in the direction opposite to each other. It When there is no foundation of the existing structure 1 under the ground part of the external reinforcement frame 2, or the foundation 1b of the existing structure 1
When the supporting force due to is insufficient, the foundation 8 for preventing the external reinforcement frame 2 from falling is transmitted while transmitting the horizontal force borne by the external reinforcement frame 2 to the foundation 1b of the existing structure 1 and the ground. .

In the case of FIGS. 1 and 2, all the openings parallel to the construction surface of the existing structure 1, which are partitioned by the vertical members 3a and the horizontal members 3b constituting the plane frame 3, and the vertical members 3a and the connecting members. Of all the openings orthogonal to the construction plane, which are partitioned by 4 and 4, at least some of the openings are provided with seismic resistant elements 5 that are capable of relative displacement with respect to the plane frame 3 as shown in FIG. 1- (a). A vibration damping device 6 that generates a damping force at the time of relative displacement between the plane frame 3 and the seismic resistant element 5 is incorporated.

In FIG. 1, an existing structure 1 of 8 floors above the ground,
The seismic resistant element 5 and the vibration control device 6 are concentrated on the opening of the external reinforcing frame 2 on the 4th to 6th floors where the amplitude is increased except for the top.
The seismic resistant element 5 and the seismic control device 6 are not necessarily required and the opening is left as it is so that it can be used as an entrance and exit. Corresponding to that, in FIG. 3, the internal reinforcement frame 7 is provided on the 3rd to 7th floors of the total internal reinforcement frame 7 of all layers
And the seismic control device 6 is incorporated in the internal reinforcing frame 7.

Seismic element 5 incorporated in the external reinforcement frame 2
Is a wall, a brace, or the like, and either one of the upper end and the lower end is connected to the plane frame 3 and the other is separated from the plane frame 3, and between the separated seismic element 5 and the plane frame 3,
Or the seismic elements 5 and 5 on the side separated from the plane frame 3
A vibration control device 6 is installed across the space, and is connected to the seismic element 5 and the plane frame 3.

The vibration control device 6 includes not only an elasto-plastic damper using a metal such as steel, but also a damper such as a friction damper, a viscous damper using a fluid such as oil, and the like between the seismic resistant element 5 and the outer frame 2. Alternatively, a device that generates a reaction force or a damping force according to the relative displacement amount between the seismic resistant elements 5 and 5 and suppresses vibration between them is used.

As shown in FIG. 1- (b), the inner reinforcing frame 7 is oriented in a direction orthogonal to the outer reinforcing frame 2, that is, in a direction in which the plane frames 3 and 3 of the outer reinforcing frame 2 face each other, and in plan view, the earthquake-resistant wall. The seismic damping device 6 is partially arranged inside the existing structure 1 as a seismic resistant element such as a brace and the like, and the seismic damping device 6 is incorporated into at least a part of the internal reinforcing frame 7. Internal reinforcement frame 7
Need not be located on all floors.

In FIG. 1- (b), while maintaining the balance of horizontal rigidity in two directions of the outer reinforcing frame 2 and the inner reinforcing frame 7,
In order to supplement the external reinforcing frame 2, the internal reinforcing frame 7 is also arranged as a supplement in the longitudinal direction of the external reinforcing frame 2.

Internal reinforcing frame 7 in which the vibration control device 6 is incorporated
Is connected to the frame 1a that can be a seismic element such as a pillar or beam of the existing structure 1 at one end, such as one of the upper end and the lower end as shown in FIGS. 3 and 6, and is separated from the frame 1a at the other end. Built in state. The internal reinforcing frame 7 without the seismic damping device 6 is installed in the frames 1a, 1a at both ends such as upper and lower ends.
Connected to.

If the end of the internal reinforcing frame 7 on the side to be separated is located near the upper floor or the lower floor, the vibration control device 6 is installed between the separated side and the frame 1a. . When the internal reinforcing frames 7 are connected to the upper floor side and the lower floor side, respectively, and when they are separated from each other in the middle part between the upper floor and the lower floor, the vibration control device 6 is installed between the separated internal reinforcing frames 7 and 7. It

FIGS. 4 and 5 show a specific example of the case where the inside of the existing structure 1 is refurbished while using the space in the external reinforcing frame 2 as a storage space for storing the equipment unit. FIG. 4 shows that the smoke exhaust duct 9 connected to the newly installed smoke exhaust duct 9 on each floor, and the smoke exhaust duct 11 connected to the smoke exhaust machine 10 installed on the rooftop floor is stored as an equipment unit in the space inside the external reinforcement frame 2. In this case, FIG. 5 shows a case where the air-cooling outdoor unit 13 connected to the air-cooling indoor unit 12 installed on each floor is installed in the space of the external reinforcing frame 2 as an equipment unit.

FIG. 6 shows a structure surface of the outer reinforcing frame 2 on the outer side,
In the case where the external reinforcing frame 2 is composed of a plurality of sets of plane frames 3, at least the plane frame 3 on the outer side stores glass, aluminum panels or other panels 14. In FIG. 6, the evacuation stairs 15 are also installed as an equipment unit in the external reinforcement frame 2.

FIG. 7- (a) shows an example of refurbishment of an air conditioner for preventing a disaster such as a fall of a cooling tower 16 attached to an existing air conditioner due to an earthquake accompanying the seismic retrofitting of the existing structure 1. Yes, the existing cooling tower 16 on the rooftop floor is arranged and integrated, a new hot and cold water generator 17 is newly installed, and an external conditioner 18 and a fan coil unit 19 are installed on each floor.

FIG. 7- (b) shows an example of the modification of the air conditioner for preventing fire burning when a fire occurs. The air conditioner 20 installed in the underground machine room is connected to the air conditioner 20 and laid through the slab. It shows a state in which the through hole of the slab is closed by removing the duct 21 and the outlet 22 that are provided.

In FIG. 8, the boiler 23 is removed together with the air conditioner 20, the duct 21 and the outlet 22 installed in the underground machine room as shown in (a), and the warehouse space 24 is provided in the basement as shown in (b). It shows how to secure.

[0038]

[Effect of the Invention] The Plane facing in two directions of the existing structure
The external reinforcement frame is constructed by pairing the external reinforcement frame of the three-dimensional frame on the outside of one of the opposite directions, and installing the seismic control device in two horizontal directions of at least a part of the external reinforcement frame. Since the seismic force in the two directions to be borne is reduced by the seismic control device, it is possible to reduce the number of newly installed internal reinforcing frames as earthquake resistant walls in the direction orthogonal to the external reinforcing frames.

Since the internal reinforcing frame itself has the effect of reducing the seismic force by incorporating the seismic control device in the internal reinforcing frame, the internal reinforcing frame as an earthquake resistant wall is more effective than the case where the internal reinforcing frame is not incorporated. The required number of
The degree of freedom in the plan in the building after the reinforcement is increased.

According to the present invention, the seismic damping effect of the seismic damping device can be effectively reduced by incorporating the seismic damping device in the outer reinforcing frame and the inner reinforcing frame centering on the middle layer of the existing structure where the amplitude during vibration becomes large. It is not necessary to incorporate seismic resistant elements and damping devices over all layers and the entire length of the external reinforcement frame in order to make full use of it, and the degree of freedom in designing the structure of the existing structure to which the external reinforcement frame is added is reduced. Moreover, it is possible to secure an opening for entering and exiting any floor while adding an external reinforcing frame.

According to the sixth aspect, since various equipment units and the like are stored in the space inside the external reinforcement frame, the equipment units placed inside the existing structure are integrated into the external reinforcement frame,
Since existing internal equipment can be wiped out, seismic retrofitting results in a greater degree of freedom in the floor plan in the building and in facility planning.

According to the present invention, since a panel such as a glass or metal panel is housed on the surface of the external reinforcing frame in the longitudinal direction, protection of the outer wall surface and reduction of radiant heat on the outer wall surface are achieved, and the length of the existing structure is increased. Life and energy saving are achieved.

[Brief description of drawings]

FIG. 1 (a) is an elevation view showing a state where an external reinforcing frame is constructed on an existing structure, and (b) is a plan view of (a).

FIG. 2 is a cross-sectional view showing an example of constructing another external reinforcing frame.

FIG. 3 is a cross-sectional view showing a construction example of an external reinforcing frame and an internal reinforcing frame.

FIG. 4 is a cross-sectional view showing an example in which the space inside the external reinforcing frame is used as a storage space for an equipment unit.

FIG. 5 is a cross-sectional view showing another example in which the space inside the external reinforcing frame is used as a storage space for the equipment unit.

FIG. 6 is a cross-sectional view showing a state in which panels are stored in an external reinforcing frame and evacuation stairs are installed.

7 (a) and 7 (b) are cross-sectional views showing an example of repair of an air conditioner.

8 (a) and 8 (b) are cross-sectional views showing how to secure a warehouse space in the basement by repairing the air conditioner.

9 (a) is an elevation view showing a case where the structure surface of the existing structure itself is reinforced by earthquake resistance, and FIG. 9 (b) is a plan view of FIG. 9 (a).

[Fig. 10] Fig. 10 (a) is an elevational view showing a case where a reinforcing frame having braces is erected outside the frame of an existing structure, and Fig. 10 (b) is
It is a top view of (a).

11 (a) is an elevation view showing a case where the entire existing structure is seismically isolated, and (b) is a plan view of (a).

[Explanation of symbols]

1 ... Existing structure, 1a ... Frame, 1b ... Foundation, 2 ... External reinforcement frame, 3 ... Plane frame, 3a ... Vertical material, 3b ... Horizontal material, 4 ... Connecting material, 5 ... … Seismic element, 6 …… Vibration control device, 7 …… Internal reinforcement frame, 8 …… Foundation, 9 …… Smoke exhaust duct, 10 …… Smoke exhauster, 11 …… Smoke exhaust duct, 12 …… Air-cooled indoor unit , 13 …… Air-cooled outdoor unit, 14 …… Panel, 15 …… Evacuation stairs, 16 …… Cooling tower, 17 …… Cold / hot water generator, 18 …… Outdoor controller, 19 …… Fan coil unit, 20 …… Air conditioner, 21 ...
… Duct, 22 …… Blowout port, 23 …… Boiler, 24 …… Warehouse space.

Front page continuation (72) Inventor Shinki Ejima 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (56) Reference JP-A-11-152905 (JP, A) JP-A-9-235890 (JP, A) JP 2000-17849 (JP, A) JP 8-135138 (JP, A) JP 2000-54648 (JP, A) JP 11-81703 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04G 23/02 E04B 1/18 E04B 1/98 E04H 9/02 301

Claims (7)

(57) [Claims] 1. A structure surface facing an existing structure in two directions.
Among them, the outer one of the opposite directions of the Plane, is constructed from is outer reinforcing Frames pairs of stereoscopic Frames, inside the existing structure, partial internal reinforcement Frames in a direction perpendicular to the external reinforcement Frames are A seismic retrofit structure of an existing structure, which is built in, where seismic control devices are installed in at least a part of the external reinforcement frame in two horizontal directions, and at least a part of the internal reinforcement frame is equipped with seismic control devices. 2. The external reinforcing frame is a frame of a three-dimensional frame,
Arranged horizontally in at least part of the frame,
2. The existing structure according to claim 1, comprising a seismic resistant element capable of relative displacement with respect to the frame, wherein a seismic control device is incorporated between the seismic resistant element and the frame, or between seismic resistant elements that are separated from each other within the same construction plane of the frame. Seismic reinforcement structure. 3. The seismic retrofit structure for an existing structure according to claim 2, wherein the frames of the external reinforcing frame are composed of two or more sets of plane frames facing each other and connected to each other. 4. An internal reinforcing frame in which a vibration control device is incorporated is constructed in a state in which a part is separated from a frame of an existing structure, and between the separated side and the frame or a side separated from the frame. The seismic strengthening structure for an existing structure according to any one of claims 1 to 3, wherein a vibration damping device is incorporated between the internal reinforcing frames. 5. The existing structure according to any one of claims 1 to 4, wherein the vibration control device for the external reinforcement frame and the vibration control device for the internal reinforcement frame are incorporated mainly in the middle layer of the existing structure. Seismic reinforcement structure. 6. The seismic retrofit structure for an existing structure according to claim 1, wherein the equipment unit is housed in a space within the external reinforcement frame. 7. The seismic retrofit structure for an existing structure according to claim 1, wherein the panel is housed on the surface of the external reinforcement frame in the longitudinal direction.