JP2011137309A - Base isolation repair structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base isolation repair structure effectively attaining base isolation without carrying out large-scale reinforcement to columns and beams of an existing building. <P>SOLUTION: The base isolation repair structure for forming a base isolating layer above a foundation of an existing building includes base isolating devices 12 interposed at cut parts of columns 10 cut above the foundation, and a hanging wall 13 provided hanging from an existing beam 11a on the upper side of the base isolating devices 12 and provided abutting on columns 10a on the upper side, and/or a spandrel wall 14 provided rising from a lower beam 11b on the lower side of the cut parts and provided abutting on columns 11b on the lower side. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seismic isolation repair structure suitable for seismic isolation by interposing a seismic isolation device on an intermediate floor or the like of an existing building.

  In recent years, in order to ensure the safety of buildings against large-scale earthquakes, earthquake resistance has been improved by reinforcing the frame of various existing buildings such as buildings designed in accordance with the old Building Standards Law. Or, measures have been taken to create seismic isolation layers to achieve seismic isolation.

  FIG. 4 shows the vibration control structure of an existing building proposed in Patent Document 1 below, and a gap 5 is formed between the left and right pillars 1 in the existing building and provided from the beam 2 on the upper floor. The hanging wall 3, the waist wall 4 provided on the beam 2 on the lower floor, and the slit wall 6 formed between the hanging wall 3 and the waist wall 4 are arranged to join the hanging wall 3 and the waist wall 4. The elasto-plastic damper 7 is added as a damping element and a seismic element.

  In the conventional vibration control structure for such an existing building, the earthquake resistance of the existing building can be improved by adding the hanging wall 3 and the waist wall 4 incorporating the elasto-plastic damper 7. Since the drooping wall 3 or the waist wall 4 on which the damping force of the elastic-plastic damper 7 acts is attached only to the beam 2, it is necessary to reinforce the beam 2 separately.

  Further, when the hanging wall 3 and the waist wall 4 are integrally joined to the left and right columns 1 and the elastic-plastic damper 7 is incorporated between them, the rigidity of the column beam frame becomes too high to be easily deformed. Therefore, in addition to not being able to obtain a desired damping effect by the elastoplastic damper 7, the column 1 may become a short column having a small flexible region and may be sheared. Therefore, there is a problem that it is difficult to obtain a desired vibration control effect while considering the balance between the existing pillar 1 and the earthquake-resistant element.

  On the other hand, as a conventional seismic isolation repair structure for forming a base isolation layer in an existing building and achieving the base isolation, there is known a structure in which the base isolation layer is formed on a floor above the foundation. According to this seismic isolation repair structure, the safety of the upper structure can be ensured by making the vibration during the earthquake in the upper structure longer through the base isolation layer.

  However, in the conventional seismic isolation repair structure, in order to install the seismic isolation device and form the seismic isolation layer, the columns and walls are cut in the horizontal direction. For this reason, the rigidity of the column beam frame in the seismic isolation layer is extremely lowered, and deformation at the time of the earthquake is concentrated.

  Therefore, conventionally, in order to suppress inter-layer deformation in the column beam frame, a high attenuation type is used as the seismic isolation device, or a damper is additionally provided to improve the attenuation performance. In order to resist the required damping force, measures are taken to reinforce the columns of the base isolation layer and the beams above and below the base isolation layer.

  That is, as shown in FIG. 5 (a) and FIG. 5 (b), reinforcing members 8a and 8b are added along the beams 8 on the upper and lower floors to be integrated and reinforced, and reinforced concrete 9a is provided on the outer periphery of the pillar 9. It is necessary to reinforce and reinforce, or to cover the pillar 9 with a steel pipe or fiber and to reinforce it. As a result, in order to construct the reinforcement for all the beams 8 and columns 9 in the seismic isolation layer, there is a problem in that it takes a great deal of time and effort and increases costs.

JP-A-9-170353

  The present invention has been made in view of the above circumstances, and is a seismic isolation repair structure that can effectively achieve seismic isolation without providing significant reinforcement to pillars and beams of existing buildings. It is a problem to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a seismic isolation repair structure for forming an isolation layer above the foundation of an existing building, the column being cut above the foundation Of the seismic isolation device intervening in the cutting portion, the hanging wall provided on the existing beam on the upper side of the seismic isolation device and in contact with the column on the upper side, and / or the cutting portion. It is characterized by comprising a waist wall that is erected on an existing beam on the lower side and is provided in contact with the column on the lower side.

  Further, the invention according to claim 2 is the invention according to claim 1, wherein between the hanging wall and the existing beam on the lower side, between the hanging wall and the waist wall, or with the waist wall. A damper that absorbs vibration in the horizontal direction is installed between the upper beam and the existing beam.

  Furthermore, the invention according to claim 3 is the invention according to claim 2, wherein the damper having one end connected to the existing beam has the one end fixed to both the existing beam and the column. It is characterized by being.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the hanging wall and the waist wall are cut at a position where the wall of the existing building corresponds to a cutting portion of the pillar. It is formed by being done, and it is characterized by each being reinforced by additional hitting.

  In the invention according to any one of claims 1 to 4, in the column beam frame forming the seismic isolation layer, depending on the cutting position of the column for interposing the seismic isolation device, the hanging wall and / or waist Add more walls. That is, when the column is cut at an intermediate portion in the height direction, the hanging wall is suspended from the existing beam on the upper side of the column beam frame to the cutting position, and the cutting position from the existing beam on the lower side. A waist wall is erected to form a gap between them. In addition, when cutting the column at the position below the existing beam on the upper side, a waist wall is erected from the existing beam on the lower side to the cutting position, and cut on the existing beam on the lower side. In this case, a hanging wall is suspended from the existing beam on the upper side to the cutting position.

  In any case, the hanging wall is provided in a state where it is at least in contact with the upper column of the seismic isolation device, and the waist wall is in contact with at least the column of the lower side of the seismic isolation device. Provided. As a result, on the upper side of the seismic isolation device, the existing beam and column are integrated and reinforced with the hanging wall, and on the lower side of the seismic isolation device, the existing beam and column are integrated with the waist wall. To be reinforced. As a result, seismic isolation can be effectively achieved without the need for additional reinforcement for pillars and beams in existing buildings, or without significant reinforcement for other pillars and beams. .

  Further, as in the invention described in claim 2, between the hanging wall and the existing beam on the lower side, which is relatively displaced during an earthquake by interposing a seismic isolation device, between the hanging wall and the waist wall, or If a damper that absorbs vibration in the horizontal direction is installed between the waist wall and the existing beam on the upper side, the damper will attenuate the vibration in the event of an earthquake, and a damping effect can be obtained. Reinforcement of existing pillars and beams can be eliminated or reduced.

  At this time, the existing beam on the upper side, the column on the upper side, and the hanging wall behave integrally, and the existing beam on the lower side, the lower column, and the waist wall behave integrally, so that the control by the damper is performed. The vibration effect is enhanced, so that the response during an earthquake can be effectively reduced.

  Furthermore, by installing the seismic isolation device at the lower or upper part of the column, when one end of the damper is joined to the existing beam on the lower or upper side, as in the invention according to claim 3, If the one end is fixed to both the existing beam and the column, the relative displacement between the upper and lower structures can be reliably transmitted to the damper, and the above-described vibration damping effect can be enhanced.

It is a front view which shows one Embodiment of the seismic isolation repair structure which concerns on this invention. It is a front view which shows the behavior at the time of the earthquake in the seismic isolation repair structure of FIG. It is a front view which shows other embodiment of this invention. It is a front view which shows the conventional earthquake-proof repair structure. (A) is sectional drawing of the beam part which shows the reinforcement structure of a beam required for the conventional earthquake-proof repair structure or a base isolation repair structure, (b) is a cross-sectional view which similarly shows the column reinforcement structure.

(First embodiment)
1 and 2 show a first embodiment of a seismic isolation repair structure according to the present invention, in which 10 (10a, 10b) is a pillar in an existing building, and 11a and 11b are exempted respectively. The existing beam on the upper side and the existing beam on the lower side of the frame forming the seismic layer.

  And in this embodiment, in the specific floor above the foundation shown in FIG. 1, the pillar 1 is cut | disconnected in the intermediate part of the height direction, and the seismic isolation apparatus 12 is installed in the said cutting | disconnection part. Earthquake has been planned. Here, a seismic isolation device using natural rubber or the like is used as the seismic isolation device 12.

  Further, at the time of this seismic isolation renovation, a reinforced concrete hanging wall 13 suspended to the above-mentioned cutting position is provided on the existing beam 11a laid between the upper columns 10a of the seismic isolation device 12 via an anchor or the like. It is expanded as one. On the other hand, on the existing beam 11b laid between the columns 10b on the lower side of the seismic isolation device 12, a reinforced concrete waist wall 14 is similarly added to the above cutting position through an anchor or the like. A predetermined clearance 15 is formed between the hanging wall 13 and the waist wall 14.

  At this time, the drooping wall 13 and the waist wall 14 are respectively separated from the upper column 10a or the lower column so that they can resist the horizontal force acting from the upper column 10a or the lower column 10b in the event of an earthquake. It is constructed so as to be in contact with the pillar 10b. Therefore, the drooping wall 13 and the waist wall 14 may be integrated with the upper column 10a or the lower column 10b via the anchor, respectively, or may be constructed in a state of simply contacting without using the anchor. Also good.

  In addition, when the said drooping wall 13 and the waist wall 14 are formed by cutting the wall of the existing building in the position corresponding to the cutting part of the pillar 10, it falls by forming the said clearance 15. In order to compensate for the increased rigidity, it is preferable to reinforce each of them.

  An oil damper 16 is horizontally disposed in the clearance 15, one end 16 a is fixed to the hanging wall 13, and the other end 16 b is fixed to the waist wall 14.

  In the seismic isolation repair structure having the above configuration, the hanging wall 13 is provided in contact with the upper column 10 a of the seismic isolation device 12, and the waist wall 14 is provided on the lower column of the seismic isolation device 12. 10b, the existing beam 11a, the upper column 10a and the drooping wall 13 behave integrally as shown in FIG. 2, and the existing beam 11b is in contact with each other. The lower column 10b and the waist wall 14 behave integrally.

  As a result, the existing beam 11a and the column 10a are reinforced by the hanging wall 13, and the existing beam 11b and the column 10b are reinforced by the waist wall 14 on the lower side. On the other hand, it is possible to effectively achieve seismic isolation without applying large-scale reinforcement.

  In addition, since the oil damper 16 that absorbs the vibration in the horizontal direction is installed between the hanging wall 13 and the waist wall 14 that are relatively displaced by the seismic isolation device 12, the existing beam 11a is installed. In addition, the upper column 10a and the hanging wall 13 behave integrally, and the existing beam 11b, the lower column 10b and the waist wall 14 behave integrally, and the vibration damping effect by the oil damper 16 is enhanced. Thus, the response during an earthquake can be effectively reduced.

(Second Embodiment)
FIG. 3 shows a second embodiment of the seismic isolation repair structure according to the present invention, and the same components as those shown in FIG. 1 and FIG. To do.
As shown in FIG. 3, this seismic isolation repair structure is applied to the case where a pillar 20 of an existing building is cut at a position below the upper existing beam 11a and the seismic isolation device 12 is installed at the cut location. It is what is done.

  In this seismic isolation repair structure, a waist wall 14 is erected from the existing beam 11b on the lower side to the cutting position, and a clearance 21 is formed between the waist wall 14 and the existing beam 11a on the upper side. ing. The oil damper 16 is horizontally disposed in the clearance 21, one end 16 a is fixed to both the existing beam 11 a and the upper column 20 a, and the other end 16 b is fixed to the waist wall 14. .

  In the seismic isolation structure having the above-described configuration, the lower column 20b and the existing beam 11b are seismically reinforced by the waist wall 14, whereas the upper beam 11a in particular is reinforced. There will be no. In addition, since the oil damper 16 is provided between the existing beam 11a and the waist wall 14, a stress corresponding to the damping force of the oil damper 16 acts on the existing beam 11a during an earthquake. Since one end 16a of the oil damper 16 is joined to both the existing beam 11a and the upper column 10a, the damping force can be received by both.

  As a result, the same effects as those shown in the first embodiment can be obtained also by the seismic isolation repair structure of the present embodiment.

  In the first and second embodiments, the seismic isolation repair structure according to the present invention includes the seismic isolation device 12 interposed in the intermediate portion in the height direction of the existing column 10 and the upper side of the column 20. However, the present invention is not limited to these, and the column is further arranged on the existing beam 11b on the lower side. The same can be applied to the case where the seismic isolation device is installed after being cut in the above.

  Incidentally, in such a case, the hanging wall 13 may be suspended from the existing beam 11a to the cutting position, and an oil damper 16 is installed in the clearance between the hanging wall 13 and the existing beam 11b on the lower side. Then, while fixing one end portion to the hanging wall 13 and fixing the other end portion to both the existing beam 11b and the lower column, the same effect as the first and second embodiments can be obtained. Obtainable.

  Further, in the first and second embodiments, the case where no additional reinforcement is applied to the existing column 10 or the beams 11a and 11b has been described. However, particularly when the oil damper 16 or the like is installed, the attenuation is performed. When the proof strength against the force is insufficient, appropriate reinforcement may be applied to the part.

  It can be used when installing seismic isolation devices on intermediate floors of existing buildings.

10, 20 Columns 10a, 20a Upper side columns 10b, 20b Lower side columns 11a Upper side existing beams 11b Lower side existing beams 12 Seismic isolation devices 13 Drooping walls 14 Waist walls 16 Oil dampers 16a One end 16b The other end

Claims (4)

It is a seismic isolation repair structure to form a base isolation layer above the foundation of an existing building,
The seismic isolation device interposed in the cut portion of the column cut above the foundation, and the vertical isolation device installed on the existing beam on the upper side of the seismic isolation device and in contact with the upper column. A seismic isolation repair structure characterized by comprising a waist wall and / or a waist wall provided in contact with the lower column and standing on an existing beam on the lower side of the cutting portion.   There is a damper that absorbs horizontal vibration between the hanging wall and the existing beam on the lower side, between the hanging wall and the waist wall, or between the waist wall and the existing beam on the upper side. The seismic isolation repair structure according to claim 1, which is installed.   The seismic isolation repair structure according to claim 2, wherein one end of the damper connected to the existing beam is fixed to both the existing beam and the column.   The hanging wall and the waist wall are formed by cutting the wall of the existing building at a position corresponding to the cut portion of the pillar, and are respectively reinforced by additional hitting. The seismic isolation repair structure according to any one of Items 1 to 3.

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