JP6547485B2 - How to replace the seismic isolation system - Google Patents

Description

  The present invention relates to a method of replacing a seismic isolation system.

  When problems such as aged deterioration or damage occur in the seismic isolation device provided between the upper structure and the lower structure, it is necessary to replace the seismic isolation device. When replacing the seismic isolation device, it is necessary to raise (jack up) the upper structure with a jack or the like to provide a gap between one of the upper structure or the lower structure and the seismic isolation device. However, when such a gap is provided, it is not possible to transmit seismic force when an earthquake occurs. Therefore, as a countermeasure, for example, a temporary member (for example, see Patent Document 1) for temporarily receiving the upper structure is installed between the upper structure and the lower structure, and the seismic isolation device is installed. After (replacement), the load is transferred from the temporary member to the seismic isolation system.

JP, 2002-155641, A

  However, in the method described above, excessive seismic force may act on the housing designed on the premise of reducing the influence of the seismic force by the seismic isolation device, which may damage the upper structure. In addition, since it is necessary to install a large temporary member capable of bearing a large horizontal force (20 to 30 percent of the load of the upper structure) as a temporary member, there is a problem that the working efficiency is deteriorated and the cost is increased. The

  The present invention has been made in view of such problems, and its main object is to improve safety against earthquakes, and to improve work efficiency and reduce costs.

In order to achieve such an object, in the seismic isolation device replacement method of the present invention, a jack-up step of jacking up the upper structure, one of the upper structure or the lower structure, and each of the old A gap material installation process for installing a gap material in each of the gaps formed between the apparatus and transmitting the load of the upper structure to the old seismic isolation system, and the old seismic isolation system sequentially Replacement process to replace the vibration device,
After all the replacement is completed, removing all the gap material and jacking down the upper structure to transmit the load of the upper structure to all the new seismic isolation devices. It is characterized by
According to such a method of replacing the seismic isolation device, the seismic isolation function of the seismic isolation device can be exhibited even during the replacement operation of the seismic isolation device, and safety against earthquakes can be improved. In addition, the seismic isolation device can be easily replaced without providing a large-scale temporary member, and improvement in work efficiency and reduction in cost can be achieved.

In the method of replacing such a seismic isolation device, in the gap material installing step, the load of the upper structure is caused to be borne by the old seismic isolation device by jacking down the upper structure after installing the gap material. Is desirable.
According to such a method of replacing the seismic isolation device, it is possible to adjust the load to be applied to the old seismic isolation device.

In the method of replacing the seismic isolation device, in the gap material installation step, the old seismic isolation device bears the load of all or a part of the upper structure, and the vertical component of the load of the upper structure is Assuming that Pv, the assumed horizontal seismic intensity of the earthquake is K, and the friction coefficient of the gap material is μ, the vertical component p of the load that the old seismic isolation device bears is p ≧ (K / μ) × Pv It is desirable to satisfy.
According to such a method of replacing the seismic isolation device, it is possible to prevent horizontal slippage between the gap material and the old seismic isolation device, and the frictional force of the gap material prevents the seismic force of the upper structure from the old force. It can be transmitted to the seismic equipment. Thus, the functions of the new seismic isolation system and the old seismic isolation system can be exhibited.

In this method of replacing a seismic isolation device, the gap material may be one in which grout is injected into the interior of a pack material. Further, the gap material may be a liner plate.
According to such a method of replacing the seismic isolation device, installation and removal can be easily performed, and the cost can be reduced.

In this method of replacing a seismic isolation device, it is desirable that the clearance material be replaced when replacing the seismic isolation device in the replacement step.
According to such a method of replacing the seismic isolation device, it is possible to cope with variations in height and strain among the seismic isolation devices.

In such a method of replacing the seismic isolation device, it is desirable that the jacks used for the jacking up and the jacking down are installed slidably in a horizontal direction.
According to such a method of replacing a seismic isolation device, when an earthquake occurs, it is possible to replace the seismic isolation performance without significantly reducing it.

  ADVANTAGE OF THE INVENTION According to this invention, while aiming at the improvement of the safety | security with respect to an earthquake, improvement of work operation efficiency and reduction of cost can be aimed at.

FIG. 1A and FIG. 1B are explanatory diagrams of the seismic isolation system 10 according to the present embodiment. FIG. 1A shows a normal state, and FIG. 1B shows a state at the time of replacement. 2A to 2E are explanatory diagrams of the method of replacing the seismic isolation device in the comparative example. 3A to 3E are explanatory diagrams of the method of replacing the seismic isolation device in the present embodiment.

=== Embodiments ===
<About the seismic isolation system>
FIG. 1A and FIG. 1B are explanatory diagrams of the seismic isolation system 10 according to the present embodiment. FIG. 1A shows a normal state, and FIG. 1B shows a state at the time of replacement.

  The seismic isolation device 10 is provided between an upper structural body 1 (for example, a building) as a seismic isolation object and a lower structural body 3 (for example, a foundation) therebelow. A plurality of such seismic isolation devices 10 are disposed between the upper structural body 1 and the lower structural body 3, and the plurality of seismic isolation devices 10 have the weight (load) of the upper structural body 1 at each position. Support for sharing.

  The seismic isolation device 10 is a laminated rubber type, and a pair of upper and lower flanges (for example, columnar elastic bodies formed by alternately laminating a circular rubber layer 12a and a steel plate 12b in a vertical direction) It is configured to be sandwiched by plates (upper flange plate 11 and lower flange plate 13). The lower flange plate 13 is fixed to the lower structure 3 by a bolt or the like (not shown), and the upper flange plate 11 is fixed to the upper structure 1 by a bolt or the like (not shown). And in the seismic isolation device 10, the laminate 12 is sheared in the horizontal direction according to the horizontal force due to the relative displacement between the upper structure 1 and the lower structure 3 (the upper flange plate 11 and the lower flange plate 13 are in the horizontal direction) The relative vibration of the upper structure 1 is made longer by changing the relative displacement of

  By the way, when problems, such as aged deterioration and damage, occur in such a seismic isolation device 10, for example, it becomes necessary to replace the seismic isolation device 10 with a new one. In the following description, the existing seismic isolation device 10 is also referred to as the old seismic isolation device 10A, and the new seismic isolation device 10 is also referred to as the new seismic isolation device 10B.

  When replacing the seismic isolation device 10, as shown in FIG. 1B, the upper structural body 1 is lifted (jacked up) by a jack or the like, and for replacement between the upper structural body 1 and the seismic isolation device 10 It is necessary to provide the necessary gap G for the However, when the gap G is provided between the seismic isolation device 10 and the upper structure 1, the horizontal force of the upper structure 1 due to an earthquake can not be transmitted to the lower structure 3. In other words, the function of seismic isolation is not realized, and there is a problem in safety when an earthquake occurs. For this reason, it is necessary to take earthquake measures during replacement work of the seismic isolation device 10.

<About the replacement method of seismic isolation system>
(Comparative example)
Before describing the present embodiment, a comparative example will be described first.

  2A to 2E are explanatory diagrams of the method of replacing the seismic isolation device in the comparative example.

  As shown in FIG. 2A, a plurality of (three in the figure) old seismic isolation devices 10A are disposed between the upper structural body 1 and the lower structural body 3. First, a temporary jack 20 for supporting the upper structure 1 is installed beside each of these old seismic isolation devices 10A.

  Next, as shown in FIG. 2B, the upper structural body 1 is jacked up with the temporary jack 20, and it is necessary to replace the seismic isolation system between the upper structural body 1 and the upper portion of the old seismic isolation system 10A. Provide a gap (equivalent to a jack-up process). By this jack-up, the load of the load of the upper structure 1 is transferred from the old seismic isolation device 10A to the temporary jack 20.

  Then, as shown in FIG. 2C, a temporary member 100 for transmitting the horizontal force of the upper structural body 1 to the lower structural body 3 is installed as an earthquake countermeasure during the seismic isolation device replacement work. In this example, as the temporary members 100, braces (braces) are provided to obliquely connect the upper structure 1 and the lower structure 3 as shown in the figure.

  Thereafter, as shown in FIG. 2D, the old seismic isolation device 10A is sequentially replaced with the new seismic isolation device 10B. In the figure, replacement is performed in order from the right. That is, the right side of FIG. 2D shows the state in which the new seismic isolation device 10B is disposed (replaced state), the middle shows the state in which the old seismic isolation device 10A is removed (state in replacement), Shows the state (the state before replacement) in which the old seismic isolation system 10A is disposed.

  When all the seismic isolation devices 10 have been replaced (replacement from the old seismic isolation device 10A to the new seismic isolation device 10B), the temporary members 100 are removed as shown in FIG. 2E. Then, the upper structural body 1 is lowered (jacked down) by the temporary jack 20, and the load of the upper structural body 1 is transferred from the temporary jack 20 to the new seismic isolation device 10B. Finally, the temporary jack 20 is removed.

  In the case of this comparative example, it is necessary to install a large temporary member 100 capable of bearing a large horizontal force of 20 to 30% of the load of the upper structure 1, which deteriorates the working efficiency and increases the cost. However, there is a risk that seismic force exceeding the strength of the frame will act.

  Therefore, in the present embodiment described below, the safety against earthquakes is improved, and the seismic isolation device 10 can be replaced more easily, thereby improving the working efficiency and reducing the cost.

(This embodiment)
3A to 3E are explanatory diagrams of the method of replacing the seismic isolation device in the present embodiment.

  Since FIG. 3A and FIG. 3B are the same as FIG. 2A and FIG. 2B respectively, description is abbreviate | omitted. That is, the description will be made from a state where the upper structure 1 is jacked up by the temporary jack 20 (a state in which a gap is formed between the upper structure 1 and the upper portion of the old seismic isolation device 10A). Although not shown, a thin plate (for example, made of stainless steel) having a small coefficient of friction (for example, stainless steel) is disposed between the temporary jack 20 and the lower structure 3, and the temporary jack 20 does not bear horizontal force ( It can slide in the horizontal direction).

  In this embodiment, after jacking up, as shown in FIG. 3C, grout packs 30 (space members, respectively) are formed in the gaps formed between the upper structural body 1 and the upper portions of the respective old seismic isolation devices 10A. And, it corresponds to the pack material) (corresponds to the gap material installation process). As described later, in the present embodiment, the grout pack 30 is also replaced along with the replacement of the seismic isolation device 10. In the following description, the first grout pack 30 (the grout pack 30 installed at the top of the old seismic isolation system 10A) is also referred to as the first grout pack 30A, and the grout pack 30 (the new seismic isolation system 10B) The grout pack 30) installed at the upper part is also referred to as a second grout pack 30B. In FIG. 3C, the first grout pack 30A is installed between the superstructure 1 and the old seismic isolation system 10A.

  The grout pack 30 (a first grout pack 30A and a second grout pack 30B) is a plastic bag-like (pack-like) member, and after being installed in an empty state, grout is internally provided from an inlet (not shown). Inject (fill). This causes the pack to expand and close the gap. In addition, grout is a material which has the fluidity | liquidity inject | poured in order to fill a cavity, a space | gap, a clearance gap, etc. FIG. In the present embodiment, cement paste (a mixture of cement and water) is used as the grout. Since the grout pack 30 can be easily installed and removed with respect to the temporary installation member 100 installed in the comparative example, the working efficiency can be improved. In addition, the cost is low and the cost can be reduced.

  When the grout injected into the first grout pack 30A hardens, the upper structure 1 is jacked down by the temporary jack 20, and all or part of the load of the upper structure 1 is transferred from the temporary jack 20 to the old seismic isolation system 10A. Let That is, the load (all or part) of the upper structure 1 is borne by the old seismic isolation device 10 through the first grout pack 30A. The load transferred from the temporary jack 20 to the old seismic isolation system 10A is determined by the amount of jack down.

Here, the vertical component of the column axial force (the load of the upper structure 1) is Pv, the horizontal seismic intensity of the assumed earthquake is K, the friction coefficient of the grout pack 30 is μ, and the seismic isolation device 10 from the temporary jack 20 (here Assuming that the vertical component of the load transferred to the old seismic isolation device 10A) is p, at least the friction in the lateral direction (K × Pv) does not occur at the time of earthquake occurrence if the frictional force (μ × p) is greater than the horizontal force (K × Pv) ,
p ≧ (K / μ) × Pv (1)
You just need to meet Thereby, the seismic force can be transmitted to the old seismic isolation device 10A by the frictional force of the first grout pack 30A, and the seismic isolation function of the old seismic isolation device 10A can be exhibited. Assuming that the axial force that the temporary jack 20 bears at this time is q,
q = Pv-p ... (2)
It becomes.

  For example, in the case of Pv = 3000 (kN), K = 0.1, and μ = 0.3, from equation (1), if pp (0.1 / 0.3) × 3000 = 1000 (kN) Good. Here, for example, when p = 2000 kN, the axial force q that the temporary jack 20 bears is q = 3000−2000 = 1000 (kN) according to equation (2).

  Note that the height and the amount of strain (the amount of deformation when the load is applied) vary among the multiple seismic isolation devices 10 (including the old seismic isolation device 10A and the new seismic isolation device 10B) due to manufacturing errors and the like. There is. Therefore, when transferring the load of the upper structure 1, the height of the installation portion of the seismic isolation device 10 (specifically, the distance between the upper structure 1 and the lower structure 3) is measured In contrast to this, it is desirable to adjust the height by means of the temporary jack 20. Here, if all loads Pv of the upper structure 1 are to be borne by the seismic isolation device 10 (that is, the axial force q of the temporary jack 20 is made zero), the height adjustment by the temporary jack 20 can not be performed. There is a fear. Therefore, it is more desirable to shift a part of the load Pv (load p satisfying the equation (1)) than to shift all the loads Pv. This makes it easier to adjust the height.

  Next, as shown in FIG. 3D, the old seismic isolation device 10A is sequentially replaced with a new seismic isolation device 10B (corresponding to the replacement process). At the same time, the first grout pack 30A is replaced with a second grout pack 30B. Here, as in the comparative example, replacement is performed sequentially from the right side. That is, the right side of FIG. 3D shows a state in which the new seismic isolation device 10B and the second grout pack 30B are arranged (replaced state), and the middle part removes the old seismic isolation device 10A and the first grout pack 30A. The left side shows the state (the state before replacement) in which the old seismic isolation system 10A and the first grout pack 30A are arranged.

  As the procedure for replacing the seismic isolation device 10, first, the upper structural body 1 is slightly jacked up with the temporary jack 20 next to the old seismic isolation device 10A to be replaced, and no load is applied to the first grout pack 30A. 1 Pull out the grout pack 30A and then remove the old seismic isolation device 10A. Next, the new seismic isolation device 10B is installed, and further, the second grout pack 30B is disposed in the gap between the upper structural body 1 and the upper portion of the new seismic isolation device 10B, and the grout is performed inside the second grout pack 30B. Inject. Then, the upper structure 1 is jacked down so as to be at the original position. As described above, in the present embodiment, the grout pack 30 (the second grout pack 30B) is sequentially disposed even after replacement with the new seismic isolation device 10B, and the new seismic isolation device 10B bears the load of the upper structure 1 I am trying to Thereby, the seismic isolation performance required at the time of an earthquake can be secured. Further, in the present embodiment, when replacing the seismic isolation device 10, the grout pack 30 is also replaced. Accordingly, it is possible to cope with cases where the heights of the old seismic isolation device 10A and the new seismic isolation device 10B are different or when the heights of the new seismic isolation device 10B vary. However, the present invention is not limited to this, and if the removed grout pack 30 (first grout pack 30A) can be used as it is, it may be used again.

  When the replacement of all the seismic isolation devices 10 is completed, as shown in FIG. 3E, all grout packs 30 (second grout packs 30B) installed above the respective new seismic isolation devices 10B are removed. As a result, as in the case of FIG. 3B, the temporary jack 20 bears the load of the upper structural body 1.

  Then, the upper structure 1 is jacked down by the temporary jack 20, and the load of the upper structure 1 is transferred from the temporary jack 20 to the new seismic isolation device 10B (corresponding to a jack down process). Thus, the load of the upper structure 1 is borne by all the new seismic isolation devices 10B. Finally, the temporary jack 20 is removed.

  As described above, in the present embodiment, the grout pack 30 (first grout pack 30A) is formed in the gap formed between the upper structural body 1 and the upper portion of each old seismic isolation device 10A by jacking up. To transmit the load of the upper structure 1 to the old seismic isolation system 10A. Then, the old seismic isolation device 10A is sequentially replaced with the new seismic isolation device 10B, and after all the replacement is completed, the grout pack 30 (second grout pack 30B) installed on the top of each new seismic isolation device 10B And jack down the upper structure 1 to transmit the load of the upper structure 1 to all the new seismic isolation devices 10B. As described above, in the present embodiment, there is no need to provide a large-scale temporary member 100 as in the comparative example, and installation and removal of the grout pack 30 can be easily performed. Therefore, the working efficiency can be improved as compared with the comparative example. In addition, since the cost of the grout pack 30 and the groud is low with respect to the cost of the temporary member 100, the cost can be reduced compared to the comparative example. Therefore, in the present embodiment, it is possible to improve the working efficiency and reduce the cost more than the comparative example.

  Further, in the comparative example, there is a gap between the upper structure 1 and the seismic isolation device 10 (old seismic isolation device 10A, new seismic isolation device 10B) until the replacement work is completed, and the seismic isolation function of the seismic isolation device 10 Can not make Since the base-isolated building is designed in consideration of the base isolation function, if the upper structure 1 and the lower structure 3 are completely fixed as shown in FIGS. 2C and 2D, the strength of the upper structure 1 There is a risk that more seismic force will work. In addition, although a long cycle can be achieved by arranging a thin plate with a small coefficient of friction between the temporary jack 20 and the lower structure 3, the restoring force and the damping force can not be obtained. , There is a risk that the building will collide with the retaining wall. In this case, for example, measures such as separately installing a damping device (such as a damper) or a restoring device (such as a spring) are necessary, and the process and cost are further increased.

  On the other hand, in the present embodiment, the seismic force can be transmitted to the seismic isolation device 10 by the frictional force of the grout pack 30, and the seismic isolation function of the seismic isolation device 10 can be obtained even during the replacement operation of the seismic isolation device 10. It can be demonstrated. Therefore, the safety can be improved more than the comparative example.

=== Other Embodiments ===
The above embodiments are for the purpose of facilitating the understanding of the present invention, and are not for the purpose of limiting the present invention. It goes without saying that the present invention can be modified and improved without departing from the gist thereof, and that the present invention includes the equivalents thereof. In particular, the embodiments described below are also included in the present invention.

  In the embodiment described above, the load of the upper structure 1 is isolated by installing the grout pack 30 in the gap between the upper structure 1 and the seismic isolation device 10 (old seismic isolation device 10A, new seismic isolation device 10B). Although it was made to bear on the vibration apparatus 10, it does not restrict to this. For example, a liner plate (steel plate) for level adjustment, a thin jack, or the like may be inserted into the gap between the upper structure 1 and the seismic isolation device 10. Thus, the load of the load on the upper structural body 1 may be transferred from the temporary jack 20 to the seismic isolation system 10. Also in this case, the horizontal force of the upper structure 1 can be transmitted to the seismic isolation device 10 by the frictional force, and the seismic isolation function of the seismic isolation device 10 can be exhibited.

  Moreover, in the above-mentioned embodiment, although the clearance was provided between the upper structure 1 and the seismic isolation apparatus 20 by jacking up, you may provide a clearance between the seismic isolation apparatus 20 and the lower structure 3 . Then, the load of the upper structure 1 may be transmitted to the seismic isolation device 20 by installing the grout pack 30 in the gap. The method of replacing the seismic isolation device 20 in this case is also the same as that of the above-described embodiment, so the description will be omitted.

Reference Signs List 1 upper structure 3 lower structure 10 seismic isolation device 10A old seismic isolation device 10B new flange 11 upper flange plate 12 laminated body 12a rubber layer 12b steel plate 13 lower flange plate 20 temporary jack 30 grout pack 30A first grout pack 30B Second grout pack 100 temporary members

Claims (7)

A method of replacing a seismic isolation device, comprising replacing a plurality of seismic isolation devices provided between an upper structure and a lower structure with an old seismic isolation device with a new seismic isolation device,
Jacking up the upper structure; and
A gap material is installed in the gap formed between one of the upper structure or the lower structure and each of the old seismic isolation devices, and the load of the upper structure is transmitted to the old seismic isolation devices Clearance material installation process to make
Replacing the old seismic isolation system with the new seismic isolation system in sequence;
A jackdown step of removing all the gap material and jacking down the upper structure to transmit the load of the upper structure to all the new seismic isolation devices after all the replacement is completed;
A method of replacing a seismic isolation device, comprising: It is the exchange method of the seismic isolation apparatus of Claim 1, Comprising:
In the gap material installing step, the load of the upper structure is borne by the old seismic isolation device by jacking down the upper structure after installing the gap material. . It is the exchange method of the seismic isolation apparatus of Claim 1 or Claim 2, Comprising:
In the gap material installation step, the old seismic isolation system bears the load of all or part of the upper structure,
Assuming that the vertical component of the load of the superstructure is Pv, the assumed horizontal seismic intensity of the earthquake is K, and the friction coefficient of the gap material is μ, the vertical component p of the load borne by the old seismic isolation device is
p ≧ (K / μ) × Pv
A method of replacing a seismic isolation system characterized in that It is the exchange method of the seismic isolation apparatus in any one of Claim 1 thru | or 3, Comprising:
The gap material is obtained by injecting grout into the inside of the pack material,
A method of replacing a seismic isolation device characterized by It is the exchange method of the seismic isolation apparatus in any one of Claim 1 thru | or 3, Comprising:
The gap material is a liner plate,
A method of replacing a seismic isolation device characterized by It is the exchange method of the seismic isolation apparatus in any one of Claim 1 thru | or 5, Comprising:
In the replacement step, the gap material is also replaced when replacing the seismic isolation device.
A method of replacing a seismic isolation device characterized by It is the exchange method of the seismic isolation apparatus in any one of Claim 1-Claim 6, Comprising:
The jacks used for the jacking up and the jacking down are slidably installed in the horizontal direction,
A method of replacing a seismic isolation device characterized by

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