JP2017071981A - Replacement method for seismic isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a replacement method for a seismic isolator enabling replacement of the seismic isolator without lifting up a structure.SOLUTION: A replacement method for a seismic isolator includes processes of: disposing a jack device 10 in the vicinity of an existing seismic isolator M; applying an upward load to a seismic isolation upper skeleton S2 by using the jack device 10 to cause the jack device 10 to temporarily receive a load borne by the existing seismic isolator M; removing the existing seismic isolator M; disposing a new seismic isolator Mn having height lower than that of the existing seismic isolator M between a seismic isolation lower skeleton S1 and the seismic isolation upper skeleton S2; disposing a bag-shaped plate jack 20 between the new seismic isolator Mn and the seismic isolation upper skeleton S2; press-fitting a filling material F1 into the plate jack 20 to cause the plate jack 20 to receive the load temporarily received by the jack device 10; and removing the jack device 10.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for replacing a seismic isolation device, for example.

  As a conventional method of replacing the seismic isolation device, in the seismic isolation part where the seismic isolation device made of laminated rubber is placed between the lower structure part and the upper structure part, the upper structure part is jacked up to A method is known in which an existing seismic isolation device is replaced with a new seismic isolation device by pulling out the sandwiching plate placed between the structure and the clearance formed by the gap between the jack-up and the thickness of the sandwiching plate. (For example, refer to Patent Document 1).

JP 2005-220947 A

  By the way, the method of exchanging the seismic isolation device described in Patent Document 1 is a method of jacking up the upper structure part (a method of lifting the entire structure) in all the seismic isolation parts of the structure. For this reason, when exchanging seismic isolation devices for high-rise structures (for example, buildings of 20 floors or more), it is difficult to lift the entire structure because the weight of the structure is very large. Moreover, although it is possible to jack up the upper structure part of the seismic isolation part of a structure by the method of exchanging the seismic isolation apparatus of the said patent document 1, in this case, the seismic isolation part jacked up and Structures (beams, etc.) between the seismic isolation part that is not jacked up generate stress due to deformation, which may damage the structure.

  In addition, the above-described method of lifting the entire structure may reduce the safety of the structure when a large earthquake occurs during jack-up, and the safety of the structure may be reduced. Costs were high due to the need for staff and large amounts of equipment.

  This invention is made | formed in view of the subject mentioned above, The objective is to provide the replacement | exchange method of the seismic isolation apparatus which can replace a seismic isolation apparatus, without lifting a structure.

The above object of the present invention can be achieved by the following constitution.
(1) A method of replacing a seismic isolation device installed between a seismic isolation lower housing and a seismic isolation upper housing of a structure, the step of placing a jack device in the vicinity of an existing seismic isolation device, and a jack device To apply an upward load to the seismic isolation upper frame, temporarily receive the load borne by the existing seismic isolation device with a jack device, remove the existing seismic isolation device, and Between the new seismic isolation device and the seismic isolation upper frame, or the process of placing a new seismic isolation device that is lower in height than the existing seismic isolation device A step of placing a bag-like plate jack between the seismic isolation device and the seismic isolation lower housing, a step of press-fitting an injection material into the plate jack and receiving the load temporarily received by the jack device with the plate jack; A step of removing the jack device, and a method of replacing the seismic isolation device.
(2) The method for replacing a seismic isolation device according to (1), comprising a step of curing the injection material press-fitted into the plate jack.
(3) A step of filling a gap between the newly installed seismic isolation device and the seismic isolation upper housing or a clearance between the newly installed seismic isolation device and the seismic isolated lower housing is provided (1) or Replacement method of seismic isolation device as described in (2).
(4) The method according to any one of (1) to (3), further including a step of fixing the newly installed seismic isolation device to at least one of the seismic isolation upper housing and the seismic isolation lower housing with a restraining member. How to replace seismic isolation devices.

  According to the present invention, the step of arranging the jack device in the vicinity of the existing seismic isolation device, and the load applied by the existing seismic isolation device by applying an upward load to the seismic isolation upper frame by the jack device. A new seismic isolation device that is lower in height than the existing seismic isolation device between the process of temporarily receiving with the jack device, the step of removing the existing seismic isolation device, and the seismic isolation lower case and the seismic isolation upper case Between the newly installed seismic isolation device and the seismic isolation upper housing, or between the newly installed seismic isolation device and the seismic isolated lower housing, and within the plate jack The seismic isolation device can be exchanged without lifting the structure because the injection material is pressed into the jack and the load temporarily received by the jack device is received by the plate jack and the jack device is removed. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the periphery of the seismic isolation lower housing, the seismic isolation upper housing, and the seismic isolation device for describing one embodiment of the seismic isolation device replacement method according to the present invention. It is a top view of the periphery of the seismic isolation lower frame and seismic isolation device shown in FIG. It is a side view explaining the state which received temporarily the load borne by the existing seismic isolation apparatus with the jack apparatus. It is a side view explaining the state which removed the existing seismic isolation apparatus. It is a side view explaining the state which has arrange | positioned the newly installed seismic isolation apparatus between the seismic isolation lower case and the seismic isolation upper case. It is a side view explaining the state which has arrange | positioned the board jack between the newly installed seismic isolation apparatus and the seismic isolation upper housing. It is a side view explaining the state which injected the injection material in the board jack, and received the load temporarily received with the jack apparatus with the board jack. It is a side view explaining the state after hardening the injection material press-fitted in the board jack. It is a side view explaining the state which removed the jack apparatus. It is a side view explaining the state which filled the filling material into the clearance gap between a newly installed seismic isolation apparatus and a seismic isolation upper housing. It is the sectional view on the AA line of FIG. It is a partially cutaway side view of the periphery of the jack apparatus shown in FIG. It is a top view explaining the board jack shown in FIG. It is the BB sectional view taken on the line of FIG. It is sectional drawing explaining the state which fixed the seismic isolation upper frame and the newly installed seismic isolation apparatus with the restraint member.

  Hereinafter, an embodiment of a method for replacing a seismic isolation device according to the present invention will be described in detail with reference to the drawings.

  First, the seismic isolation part SP of the structure S will be described. As shown in FIG. 1, the seismic isolation part SP includes a seismic isolation lower casing S1 of the lower structure part SB of the structure S, an isolation base upper casing S2 of the upper structure part SU of the structure S, and a seismic isolation lower casing. A seismic isolation device M disposed between S1 and the seismic isolation upper housing S2.

  The seismic isolation lower housing S1 is made of reinforced concrete or the like, and a lower plate P1 for attaching the seismic isolation device M is fixed on the upper surface thereof.

  The seismic isolation upper frame S2 is made of reinforced concrete or the like, and an upper plate P2 for attaching the seismic isolation device M is fixed to the lower surface thereof. In addition, the code | symbol S3 in FIG. 1 is a beam fixed to seismic isolation upper frame S2.

  The seismic isolation device M includes a lower flange M1 and an upper flange M2 that are vertically opposed to each other, and a laminated rubber M3 provided between the lower flange M1 and the upper flange M2. The lower flange M1 is fastened to the upper surface of the lower plate P1 of the base isolation lower housing S1 with a plurality of lower bolts B1, and the upper flange M2 is connected to the lower surface of the upper plate P2 of the base isolation upper housing S2 with a plurality of upper bolts B2. It is concluded. Moreover, since the seismic isolation device M in the installed state receives a vertical load from the seismic isolation upper housing S2, it has a shape contracted in the vertical direction. An existing seismic isolation device M and a new seismic isolation device Mn which will be described later have the same structure except that the height dimension is different.

  Hereinafter, the exchange method of the seismic isolation apparatus M of the above-mentioned seismic isolation part SP is demonstrated. First, as shown in FIG.1 and FIG.2, the jack apparatus 10 is arrange | positioned in the vicinity of the existing seismic isolation apparatus M between the seismic isolation lower casing S1 and the seismic isolation upper casing S2. Four jack devices 10 are arranged around the seismic isolation device M at approximately 90 ° intervals. The number of jack devices 10 is one or more, and is determined by the performance and axial force of the jack device 10.

  Here, the jack apparatus 10 will be described. As shown in FIG. 12, the jack device 10 is disposed between a jack 11 disposed between the seismic isolation lower housing S <b> 1 and the seismic isolation upper housing S <b> 2, and between the seismic isolation lower housing S <b> 1 and the jack 11. A lower sliding plate 12, an upper sliding plate 13 disposed between the seismic isolation upper housing S2 and the jack 11, a lower sliding member 14 disposed between the lower sliding plate 12 and the jack 11, An upper sliding member 15 disposed between the upper sliding plate 13 and the jack 11, and the jack 11 is configured to slide horizontally between the lower sliding plate 12 and the upper sliding plate 13. . In addition, a stop portion 12a for stopping the sliding of the jack 11 is provided on the peripheral edge of the upper surface of the lower sliding plate 12 over the entire circumference. Further, a stop portion 13a for stopping the sliding of the jack 11 is provided on the peripheral edge of the lower surface of the upper sliding plate 13 over the entire circumference.

  Next, as shown in FIG. 3, by applying pressure to the four jack devices 10, an upward load is applied to the seismic isolation upper housing S2, and the load borne by the existing seismic isolation device M is increased to four jacks. Temporarily received by the apparatus 10. Thereby, the stress applied to the existing seismic isolation device M is released.

  Next, as shown in FIG. 4, the existing seismic isolation device M is removed. In addition, the removal method of the existing seismic isolation apparatus M can mention the method of cooling and contracting the laminated rubber M3 of the seismic isolation apparatus M, the method of cutting the laminated rubber M3, and the like.

  Next, as shown in FIG. 5, a new seismic isolation that is lower in height than the existing seismic isolation device M between the lower plate P1 of the seismic isolation lower housing S1 and the upper plate P2 of the seismic isolation upper housing S2. Arrange the device Mn. At this time, the lower flange M1 of the newly installed seismic isolation device Mn is fastened to the lower plate P1 with the lower bolt B1.

  Next, as shown in FIG. 6, the bag-shaped board jack 20 is arrange | positioned between the upper flange M2 of the newly installed seismic isolation apparatus Mn, and the upper plate P2 of the seismic isolation upper housing S2. At this time, the upper bolt B2 is inserted into the bolt insertion hole of the upper flange M2 of the newly installed seismic isolation device Mn and screwed loosely into the upper plate P2. When the gap between the upper flange M2 and the upper plate P2 is large, for example, a metal plate for gap adjustment may be inserted between the upper flange M2 and the plate jack 20.

Here, the bag-shaped board jack 20 will be described. As shown in FIGS. 13 and 14, the plate jack 20 is formed by welding the outer peripheral edges of a pair of upper and lower metal plates (in this embodiment, a thin plate of mild steel) having a substantially circular shape in plan view. The inner side is bag-shaped. Further, an injection portion 22 for injecting an injection material F1 (see FIG. 11) into the plate jack 20 is provided on the outer peripheral edge of the plate jack 20, and the injection material F1 is injected into the injection portion 22 An injection tube 23 is attached for this purpose. The injection material F1 is a cement-based injection material. Further, the width dimension of the plate jack 20 is set to be larger than the laminated rubber M3 of the seismic isolation device Mn and smaller than the position where the upper bolt B2 is inserted. In the present embodiment, for example, the diameter is about 800 mm. . Moreover, the thickness dimension of the board jack 20 is about 2.5-3.5 mm. The pressure that can be generated by the plate jack 20 is about 10 to 15 N / mm ² . In addition, the board jack 20 shown in FIGS. 6-9, FIG. 11, FIG. 15 is simplified and represented.

  Next, as shown in FIG. 7, the injection material F <b> 1 is press-fitted into the plate jack 20, and the load temporarily received by the four jack devices 10 is received by the plate jack 20. Thereby, since the board jack 20 swells up and down, the newly installed seismic isolation device Mn receives the injection pressure of the injection material F1 and the vertical dimension is reduced. Whether or not a predetermined axial force has been introduced to the plate jack 20 is determined based on the injection pressure of the injection material F1 and the amount of shrinkage of the newly installed seismic isolation device Mn.

  Next, as shown in FIG. 8, the injection material F1 press-fitted into the board jack 20 is cured. After the curing, the upper bolt B2 is finally tightened, and the upper flange M2 of the newly installed seismic isolation device Mn is fastened to the upper plate P2 of the seismic isolation upper housing S2.

  Next, as shown in FIG. 9, the four jack apparatuses 10 between the base isolation lower casing S1 and the base isolation upper casing S2 are removed.

  Next, as shown in FIGS. 10 and 11, the gap between the upper flange M2 of the newly installed seismic isolation device Mn and the upper plate P2 of the seismic isolation upper housing S2 is filled with a filler F2 to fill the gap. The filler F2 is a cement-type filler. And by this process, replacement | exchange of the seismic isolation apparatus M is completed, and after that, the seismic isolation apparatus M of all the seismic isolation parts SP of the structure S is replaced | exchanged sequentially.

  And the structure of the seismic isolation part SP after performing the replacement | exchange method of the seismic isolation apparatus M of this embodiment is between the upper flange M2 of the newly installed seismic isolation apparatus Mn, and the upper plate P2 of the seismic isolation upper housing S2. The bag-like plate jack 20 into which the injection material F1 is injected is arranged, and the filler F2 is provided in the gap between the upper flange M2 of the newly installed seismic isolation device Mn and the upper plate P2 of the seismic isolation upper housing S2. It becomes a filled structure.

  As described above, according to the method of replacing the seismic isolation device M of the present embodiment, the step of placing the jack device 10 in the vicinity of the existing seismic isolation device M and the jack device 10 can Applying the load in the direction and temporarily receiving the load borne by the existing seismic isolation device M with the jack device 10, removing the existing seismic isolation device M, and the seismic isolation lower housing S1 and the seismic isolation A process of placing a new seismic isolation device Mn having a height lower than that of the existing seismic isolation device M between the upper case S2 and a bag-like shape between the new seismic isolation device Mn and the seismic isolation upper case S2. A step of arranging the plate jack 20, a step of press-fitting the injection material F1 into the plate jack 20 and receiving the load temporarily received by the jack device 10, and a step of removing the jack device 10. Without lifting the structure S It is possible to replace the seismic isolation devices M.

  Thereby, even if it is a high-rise structure, the seismic isolation apparatus M can be replaced | exchanged easily. Moreover, since it is not the method of raising only the seismic isolation upper frame S2 of some seismic isolation parts SP, uneven stress does not generate | occur | produce in the structure S and damage to the structure S can be prevented. Moreover, since it is not the method of lifting the whole structure S, even if a big earthquake occurs at the time of replacement | exchange, the safety | security of the structure S can be ensured and replacement cost can be restrained low. Moreover, since it is the method of replacing | exchanging the seismic isolation apparatus M of some seismic isolation part SP of the structure S sequentially, compared with the method of lifting the whole structure S, a construction period can be shortened.

  As a modification of the present embodiment, as shown in FIG. 15, the upper flange M2 of the newly installed seismic isolation device Mn may be fixed to the seismic isolation upper housing S2 with a restraining member 30. In this case, the newly installed seismic isolation device Mn is firmly fixed by the seismic isolation upper frame S2.

  The constraining member 30 has a crank shape in cross section, and includes a base 31 fixed to the seismic isolation upper housing S2 with restraining bolts B3, and an upper plate P2 of the seismic isolation upper housing S2 together with an upper flange M2 of the seismic isolation device Mn. It has the restraint part 32 fixed with the volt | bolt B2, and the connection part 33 which connects the base part 31 and the restraint part 32 up and down. Further, the restraining member 30 is formed in a ring shape so as to cover the entire circumference of the upper flange M2 of the seismic isolation device Mn, and even if it is a single ring-shaped member, it is a ring-shaped member divided into a plurality of parts. May be. Moreover, the restraining member 30 may be provided individually according to the position of the upper bolt B2 instead of the ring shape. The lower flange M1 of the seismic isolation device Mn may be fixed to the seismic isolation lower housing S1 by the restraining member 30, and the lower flange M1 and the upper flange M2 of the seismic isolation device Mn are seismically isolated by the two restraining members 30. You may fix to lower housing S1 and seismic isolation upper housing S2, respectively.

In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.
For example, in the above embodiment, after the jack device 10 is removed, the filler F2 is filled in the gap between the upper flange M2 of the newly installed seismic isolation device Mn and the upper plate P2 of the seismic isolation upper housing S2. The order of the two steps may be reversed.
Moreover, the process of filling the filler F2 in the gap between the upper flange M2 of the newly installed seismic isolation device Mn and the upper plate P2 of the seismic isolation upper housing S2 may be omitted. That is, the gap need not be filled with a filler.
Moreover, in the said embodiment, although the board jack 20 is arrange | positioned between the upper flange M2 of the newly installed seismic isolation apparatus Mn, and the upper plate P2 of the seismic isolation upper housing S2, it is not limited to this, A newly installed A plate jack 20 may be disposed between the lower flange M1 of the seismic device Mn and the lower plate P1 of the seismic isolation lower housing S1.
The lower plate P1 and the upper plate P2 may be embedded in the upper surface of the seismic isolation lower casing S1 and the lower surface of the seismic isolation upper casing S2, respectively.

  Furthermore, the method for exchanging the seismic isolation device of the present invention can be used not only for exchanging existing seismic isolation devices, but also for seismic isolation of structures that do not have seismic isolation devices. As a specific procedure, for example, first, a structure around a casing extending up and down of the structure is supported by a jack device, and then a part of the casing is cut and removed, and a seismic isolation device is installed in the cutting space. Next, press the injection material into the plate jack and support the load supported by the jack device with the plate jack (support the vertical load from the upper casing above the cutting part) After that, the plurality of jack devices are removed. According to this method, the structure can be seismically isolated without lifting the structure.

S structure SP base isolation part SB lower structure part S1 base isolation lower frame P1 lower plate SU upper structure part S2 base isolation upper casing P2 upper plate M existing base isolation device Mn new base isolation device M1 lower flange M2 upper flange M3 Laminated rubber B1 Lower bolt B2 Upper bolt F1 Injection material F2 Filler 10 Jacking device 11 Jack 12 Lower sliding plate 13 Upper sliding plate 14 Lower sliding member 15 Upper sliding member 20 Plate jack 30 Restraining member

Claims (4)

A method of exchanging a seismic isolation device installed between a base isolation base and a base isolation top of a structure,
Placing a jack device near an existing seismic isolation device;
Applying an upward load to the seismic isolation upper frame by the jack device, and temporarily receiving the load borne by the existing seismic isolation device by the jack device;
Removing the existing seismic isolation device;
Placing a newly installed seismic isolation device having a height lower than that of the existing seismic isolation device between the seismic isolation lower housing and the seismic isolation upper housing;
Placing a bag-like plate jack between the newly installed seismic isolation device and the seismic isolation upper housing, or between the newly installed seismic isolation device and the seismic isolation lower housing;
A step of press-fitting an injection material into the plate jack and receiving the load temporarily received by the jack device with the plate jack;
A step of removing the jack device, and a method of replacing the seismic isolation device.   The method for replacing a seismic isolation device according to claim 1, further comprising a step of curing the injection material press-fitted into the plate jack.   2. The method of claim 1, further comprising a step of filling a gap between the new seismic isolation device and the seismic isolation upper housing or a gap between the new seismic isolation device and the seismic isolation lower housing. Alternatively, the method for replacing the seismic isolation device described in 2.   The base isolation device according to any one of claims 1 to 3, further comprising a step of fixing the newly installed base isolation device to at least one of the base isolation upper housing and the base isolation lower housing with a restraining member. How to replace the device.

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