JP7257265B2 - Damper mounting structure - Google Patents

Description

The present invention relates to a damper mounting structure for damping horizontal relative displacement between a lower structure and an upper structure.

Buildings that are to be seismically isolated are equipped with seismic isolation devices installed between the lower structure and the upper structure, and dampers that attenuate the horizontal relative displacement between the lower structure and the upper structure. It is As a damper mounting structure, a damper is disposed across a lower damper base portion on the lower structure side and an upper damper base portion on the upper structure side (see, for example, Patent Document 1).

In the damper mounting structure described in Patent Document 1, the upper damper base portion includes an upper pillar for the seismic isolation device, which is arranged at a location where the seismic isolation device is arranged among the columns of the upper structure, It is configured using the upper beam of the upper structure.

The upper pillar for the seismic isolation device is provided with an upper pillar reinforcement part that reinforces the upper pillar in order to attach the seismic isolation device. The upper pillar reinforcement part is constructed as a reinforcement part that expands the cross-sectional area of the upper pillar for the seismic isolation device by placing reinforcing bars around the upper pillar and pouring concrete. In addition, an upper beam reinforcing part is constructed by assembling reinforcing bars around the upper beam and placing concrete to increase the beam width and beam height of the upper beam.

Thus, by attaching the end portion of the damper on the upper structure side to the upper column reinforcing portion and the upper beam reinforcing portion, the upper column reinforcing portion and the upper beam reinforcing portion are used as the upper side damper base portion.

Japanese Patent No. 4980782

In the damper mounting structure described in Patent Literature 1, the upper damper base portion is configured using an upper column reinforcing portion that reinforces the upper column and an upper beam reinforcing portion that reinforces the upper beam. However, in order to construct the upper damper foundation, the upper column reinforcement and upper beam reinforcement must be constructed, which complicates the structure and requires reinforcing bars around the upper columns and beams. It is necessary to perform on-site work to place concrete, which causes a decline in workability.

In view of this situation, it is a primary object of the present invention to provide a damper mounting structure that is capable of constructing an upper damper base while simplifying the structure and improving workability.

A first characteristic configuration of the present invention is a seismic isolation device disposed between a lower structure and an upper structure,
a damper for damping horizontal relative displacement between the lower structure and the upper structure;
In the damper mounting structure, wherein the damper is disposed across a lower damper base portion on the lower structure side and an upper damper base portion on the upper structure side,
Among the pillars of the upper structure, the upper pillars disposed at locations where the seismic isolation devices are not arranged are provided with downward extension pillar portions that are extended downward,
The upper damper base portion is configured by the downward extension column portion ,
The lower extension column portion is made of precast concrete integrated with the upper column .

According to this configuration, the upper damper base portion is composed of the downwardly extended pillar portion obtained by extending the upper pillar arranged at the location where the seismic isolation device is not arranged. The damper can be installed while effectively using the upper pillars arranged at the place where the device is not arranged. In addition, the upper damper base unit integrated with the upper structural body can be constructed simply by extending the upper pillar downward to construct the downward extension pillar portion. Therefore, for example, the damper can be attached while simplifying the structure and improving the workability without separately constructing the upper damper base part in a state of being connected to the beam of the upper structure.

Furthermore, according to this configuration, since the downward extension pillar portion is made of precast concrete that is integrated with the upper pillar, only by installing the precast concrete, the upper part that is integrated with the upper structure body can be installed. The side damper foundation can be constructed, and the workability can be effectively improved.

A second characteristic configuration of the present invention is that the downwardly extending column portion is configured by extending the upper column downward with the same cross-sectional area.

According to this configuration, the lower extension column portion can be constructed simply by extending the upper column downward with the same cross-sectional area. can be improved. Moreover, since the upper damper base can have the same cross-sectional area as the upper pillar, a sufficient cross-sectional area can be secured for the upper damper base, and the mounting strength of the damper can be improved. can.

A third characteristic configuration of the present invention is that a portion of the column main reinforcement of the upper column is arranged in a downwardly extending state at the downwardly extending column portion.

According to this configuration, the upper damper base portion, which is the part of the downward extension column, is not required to be as strong as the upper column. be able to. Moreover, since only a part of the column main reinforcement is extended to the upper damper foundation, the number of reinforcing bars in the upper damper foundation can be reduced. It becomes easy to arrange, and it is possible to improve the fit of reinforcing bars, anchors, etc. in the upper damper base.

Floor plan showing the schematic configuration of the seismic isolation structure of the seismic isolation layer Side view showing damper mounting structure Side view showing precast concrete that integrates the upper pillar and the lower extended pillar part Diagram showing the arrangement of reinforcing bars in the upper column and the lower extension column

An embodiment of a seismic isolation structure for a building to which the damper mounting structure according to the present invention is applied will be described with reference to the drawings.
In this seismic isolation structure, as shown in FIG. As shown in FIG. 1, the seismic isolation layer 4 is provided with a plurality of laminated rubber bearings 5, a plurality of slide bearings 6, and a plurality of dampers 7. . The laminated rubber bearing portion 5 and the sliding bearing portion 6 are arranged in a grid pattern with a predetermined interval (for example, column span) in plan view. Incidentally, in FIG. 1, the laminated rubber bearing portion 5 is schematically illustrated by "○", and the sliding bearing portion 6 is schematically illustrated by "□".

As shown in FIG. 2, the laminated rubber support portion 5 is arranged, for example, between the lower structure 2 (foundation 23) and the first upper column 31 of the upper structure 3, and is mounted on the lower structure 2. It is configured to suppress transmission of seismic energy by deformation of the laminated rubber while supporting the structure 3 . Although not shown, the slide bearing 6 is also disposed between the lower structure 2 and the upper structure 3, and supports the upper structure 3 on the lower structure 2. It is configured to allow movement in the horizontal direction with respect to the structure 3 to suppress transmission of seismic energy.

The damper 7 is configured to dampen horizontal relative displacement between the lower structure 2 and the upper structure 3 . As the damper 7, as shown in FIG. 1, for example, a first damper 71, a second damper 72 and a third damper 73 are provided. The first damper 71 and the second damper 72 are arranged in a straight line, and the third damper 73 is arranged in a posture perpendicular to the first damper 71 and the second damper 72 .

As the mounting structure of the damper 7, since the first damper 71, the second damper 72, and the third damper 73 all employ the same mounting structure, the mounting structure of the third damper 73 will be described with reference to FIG. explain.

As shown in FIG. 2, the third damper 73 is arranged across the lower damper base portion 8 on the side of the lower structure 2 and the upper damper base portion 9 on the side of the upper structure 3, and extends along the horizontal direction. It is equipped with a posture. The lower damper base portion 8 is provided in a state of protruding upward from the base beams 22 and the like of the lower structure 2 (foundation 23). The lower damper foundation 8 is made of, for example, precast concrete or cast-in-place concrete. Although not shown, reinforcing bars or the like are embedded across the foundation beam 22 and the lower damper foundation 8. , the lower damper base portion 8 is joined to the base beam 22 . A mounting plate for mounting the damper is inserted into a lower anchor 10 (indicated by a dotted line in FIG. 2) embedded in the lower damper base portion 8 and fastened with fasteners such as bolts and nuts, thereby forming a third damper. One end of 73 (the left end in FIG. 2) is attached to the lower damper base 8 via an attachment plate.

The upper damper base portion 9 is constructed using the second upper pillar 32 (corresponding to the upper pillar) of the upper structure 3, as shown in FIG. The second upper pillar 32 used for the upper damper base 9 is arranged at a location of the pillars 31 and 32 of the upper structure 3 where the laminated rubber support 5 (corresponding to the seismic isolation device) is not arranged. pillars 32 (for example, studs). The second upper pillar 32 is configured to have a smaller cross-sectional area than the first upper pillar 31 arranged at the location where the laminated rubber support portion 5 is arranged. The second upper pillar 32 is provided with a downward extension pillar portion 33 that extends downward, and the upper damper base portion 9 is configured with the downward extension pillar portion 33 .

The downward extension pillar portion 33 extends downward from an upper beam 34 that connects the lower end portions of the first upper pillar 31 and the second upper pillar 32, and protrudes downward from the upper beam 34. are provided. The downward extension column portion 33 is composed of precast concrete 40 integrated with the second upper column 32, and the downward extension column portion 33 is configured by extending the second upper column 32 downward with the same cross-sectional area. ing. As a result, for example, by constructing the precast concrete 40 with high-strength concrete, the upper damper base portion 9 can be constructed as a high-strength base portion while sufficiently ensuring the strength of the second upper pillar 32. can be done.

The precast concrete 40 that integrates the downward extension column portion 33 and the second upper column 32 has a rectangular cross-sectional shape (see FIG. 4). FIG. 3 illustrates precast concrete 40 in which the lower side portion 32a and the downward extension column portion 33 extending from the lower side portion 32a of the second upper column 32 are integrated. 3(a) is a side view seen from the same direction as the side view of FIG. 2, and FIG. 3(b) is a side view seen from a direction orthogonal to FIG. 3(a).

The lower extension column portion 33 is configured by extending the second upper column 32 downward with the same cross-sectional area, and the upper anchor 11 is embedded therein. The upper side anchors 11 are for attaching the damper 7, and as shown in FIGS. An upper side anchor 11 is provided. As shown in FIG. 2, the mounting plate for mounting the damper is inserted into the upper anchor 11 (indicated by the dotted line in FIG. 2) embedded in the upper damper base portion 9 (downwardly extending column portion 33), and the bolt is tightened. The other end (the right end in FIG. 2) of the third damper 73 is attached to the upper damper base portion 9 via a mounting plate by fastening with a fastener such as a nut.

As shown in FIG. 1, the damper 7 is provided with a first damper 71, a second damper 72 and a third damper 73. Three dampers 7, 71-73, are attached. Three dampers 7 of first to third dampers 71 to 73 are attached to the upper damper base portion 9 so as to extend in three different directions. Therefore, as shown in FIGS. 3 and 4, the upper damper base portion 9 includes a first upper anchor 11a for attaching the first damper 71 and a second upper anchor 11a for attaching the second damper 72. 11b and a third upper anchor 11c for attaching the third damper 73 are provided in an embedded state.

As shown in FIG. 3, the first upper anchor 11a and the second upper anchor 11b are arranged at the same position in the vertical direction, and the third upper anchor 11c is arranged between the first upper anchor 11a and the second upper anchor 11a. They are arranged at different positions in the vertical direction with respect to the side anchor 11b. As a result, the first upper anchor 11a, the second upper anchor 11b, and the third upper anchor 11c are arranged well without interfering with each other. Since the first upper anchor 11a and the second upper anchor 11b are provided in a state of extending in a straight line, for example, the first upper anchor 11a and the second upper anchor 11b can be connected by one anchor. Can be used in combination.

When constructing the above-mentioned precast concrete 40, as shown in FIG. 3, the precast concrete 40 and the upper beam 34 (Fig. 2) are joined by embedding the reinforcing bars 15 protruding in the left-right direction from the precast concrete 40 and extending in the upper beams 34 . In the precast concrete 40 shown in FIG. 3, the part where the upper beam 34 is joined has the same cross-sectional area as the second upper column 32 and the downward extension column part 33. For example, in the precast concrete 40, the upper beam 34 can be wider than the second upper column 32 and the downward extension column portion 33. The precast concrete 40 and the upper part of the second upper column 32 are joined by embedding the column main reinforcement 12 projecting upward from the precast concrete 40 into the upper part of the second upper column 32 . Therefore, in the second upper pillar 32 , the upper end of the precast concrete 40 serves as a connection point between the lower side portion 32 a and the upper side portion of the second upper pillar 32 .

The arrangement state of reinforcing bars in the second upper column 32 and the upper damper base portion 9 (lower extension column portion 33) will be described with reference to FIG. FIG. 4(a) shows the arrangement of reinforcing bars in the second upper column 32, and FIG. 4(b) shows the arrangement of the reinforcing bars in the upper damper base portion 9 (downward extension column portion 33). showing.

As shown in FIG. 4( a ), a plurality of column main reinforcements 12 are arranged at intervals in the circumferential direction of the rectangular cross section of the second upper column 32 , and a hoop is arranged to surround the plurality of column main reinforcements 12 . A muscle 13 is provided. In addition to the column main reinforcements 12 and the hoop reinforcements 13, a plurality of core reinforcements 14 are arranged to hook the column main reinforcements 12 arranged at opposing positions.

As shown in FIG. 4B, the upper damper base portion 9 (downward extension column portion 33) is also provided with the column main reinforcement 12, the hoop reinforcement 13, and the core reinforcement 14 in the same manner as the second upper pillar 32. It is However, part of the column main reinforcement 12 of the second upper column 32 is arranged in a downwardly extended state in the upper damper base portion 9 (downward extension column portion 33). That is, only a part of the column main reinforcement 12 of the second upper column 32 is arranged on the upper damper base portion 9 (the downward extension column portion 33). As shown in FIG. 4(b), the upper damper base portion 9 (downward extension column portion 33) includes two column main reinforcements 12 arranged in the lower central portion in FIG. A total of four column main reinforcements 12, one column main reinforcement 12 arranged on the side and one column main reinforcement 12 arranged on the upper right side, are removed. It is not provided, and the number of column main reinforcements 12 is reduced. By removing the column main reinforcement 12 arranged at the opposite position, the core reinforcement 14 hooked to the column main reinforcement 12 is also removed.

In the upper damper base portion 9 (downward extension column portion 33), the space for arranging the removed column main reinforcing bars 12 is used as an anchor arranging space. By removing the , the third upper side anchor 11c is provided. In addition, the first upper anchor 11a is arranged by removing one column main reinforcement 12 arranged on the upper left side, and one column main reinforcement 12 arranged on the upper right side is removed. Therefore, the second upper anchor 11b is provided. Moreover, since not only the column main reinforcement 12 but also the core reinforcement 14 are removed, the removed space is also effectively utilized as an anchor installation space.

[Another embodiment]
(1) In the above embodiment, the downwardly extending column portion 33 is configured by extending the second upper column 32 downward with the same cross-sectional area, but the downwardly extending column portion has a larger cross-sectional area than the upper column. It may be small.

(2) In the above-described embodiment, only part of the column main reinforcement 12 of the second upper column 32 is arranged in the downwardly extending column portion 33 in such a manner as to extend downward. All of the main reinforcing bars 12 may be arranged in the downward extension column portion 33 in a state of being extended downward.

2 Lower structure 3 Upper structure 5 Laminated rubber bearing (seismic isolation device)
7 damper 8 lower damper foundation 9 upper damper foundation 12 column main reinforcement 32 second upper column (upper column)
33 downward extension pillar part

Claims (3)

a seismic isolation device disposed between the lower structure and the upper structure;
a damper for damping horizontal relative displacement between the lower structure and the upper structure;
The damper is a damper mounting structure disposed across a lower damper base portion on the lower structure side and an upper damper base portion on the upper structure side,
Among the pillars of the upper structure, the upper pillars disposed at locations where the seismic isolation devices are not arranged are provided with downward extension pillar portions that are extended downward,
The upper damper base portion is configured by the downward extension column portion ,
The damper mounting structure , wherein the downward extension pillar portion is made of precast concrete integrated with the upper pillar . 2. The damper mounting structure according to claim 1 , wherein said downwardly extending pillar portion extends downwardly from said upper pillar with the same cross-sectional area. 3. The damper mounting structure according to claim 1 , wherein a portion of the column main reinforcement of the upper column is arranged in the downwardly extending column portion in a state of being extended downward.

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