JP2766882B2 - Detachment method of seismic isolation device and detachment device used for the method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of attaching / detaching a seismic isolation device applied to a building such as a reinforced concrete structure, and an attaching / detaching device of a seismic isolation device used in the method. A method of mounting or dismounting a seismic isolation device between a superstructure and a foundation of the building when the seismic isolation device is of a laminated rubber type, and a seismic isolation device used in the method. Related to the attachment / detachment device.

[Prior Art] Generally, in a middle- and high-rise building, the entire upper structure of the building is supported by the foundation, and the horizontal force of the earthquake is absorbed by deformation of the seismic isolation device, and is not transmitted to the building as input. With the development of seismic isolation structures, the results as effective seismic means are increasing, and among them, laminated rubber-type seismic isolation devices are in the spotlight.

However, as shown in FIGS. 3 and 4, in order to mount the seismic isolation device 4 between the upper structure 2 and the foundation 3 of the building 1 which is structurally formed separately, The seismic isolation device 4 is installed on the foundation 3 to be constructed, and then the upper structure 2 is constructed thereon, or the entire weight of the upper structure 2 is temporarily supported by another seismic isolation device, etc. It is necessary to remove the temporary support after forming a space for mounting between them and installing the seismic isolation device 4 within the space. To this end, as a method adopted as a conventional technique, as shown in FIG. 3, a method of raising the entire upper structure 2 using a lifting jack 5, lowering the seismic isolation device after mounting, and installing the upper structure 2. As shown in FIG. 4, after temporarily supporting with a jack, another seismic isolation device, or the like, the lower surface of the seismic isolation device 4 and the upper surface of the foundation 3 which are mounted and supported via the mounting plate 6 and the anchor bolt 7 are attached. A method of grouting a mortar 8 for level adjustment between the pedestal and the temporary support is removed after the pedestal is hardened. However, if necessary, such as maintenance or replacement of the regular function check of the seismic isolation device,
There is no known method of dismounting it, except that the steps of these mounting methods are performed in reverse steps.

[Problems to be Solved by the Invention] However, in the above method, at least the entire structure is raised, and the entire weight thereof is temporarily supported to temporarily form a space for attachment and detachment. It is necessary to use a jack, and it is conceivable that jacking up with a jack becomes impossible in large-scale buildings such as nuclear facilities.

In addition, by breaking the grout mortar layer formed between the upper structure and the pedestal for level adjustment, it is possible to secure gaps required for attachment and detachment below each seismic isolation device. In order to ensure that the mortar layer must be formed again when the device is inserted, and to ensure a predetermined supporting surface pressure at that time, some other means is required, which has structural uncertainties. there were.

In addition, since the laminated rubber type seismic isolation device installed between the foundation and the upper structure as described above supports the entire weight of the upper structure, each individual seismic isolation device itself also adds weight. It is a large one, and the handling work for insertion and removal is not easy.

[Means for Solving the Problems] In view of the above-mentioned circumstances, the present invention has been created by tackling a new point of interest rather than eliminating the disadvantages of the conventional technology, and A lower surface of the upper structure,
In a method of mounting a laminated rubber type seismic isolation device within a distance from an upper surface of a pedestal on a foundation, a lower sliding plate of a sliding device including a pair of upper and lower wedge-shaped sliding plates is installed on an upper surface of the pedestal. Fixing the upper sliding plate of the sliding device to the lower flange of the seismic isolation device,
Supporting the upper diaphragm fixed to the seismic isolation device with a fork of the detachable device, applying a relative horizontal force to the seismic isolation device, and applying a shearing deformation so that the seismic isolation device can be inserted into the space, separately supporting the upper structure pair. Inserting the deformed seismic isolation device into the space, fixing the upper flange of the seismic isolation device to the lower surface of the upper structure, and upper sliding plate fixed to the sheared seismic isolation device. Press-fitting along the lower sliding plate, restoring the seismic isolation device to its original shape, and then fixing the upper and lower sliding plates. It is intended to provide a method of removing a seismic isolation device in which the method is substantially reversed, and a detachable device of the seismic isolation device used for performing these methods.
As a result, in the seismic isolation device of an arbitrary building, the seismic isolation device is attached and detached within a predetermined gap between the foundation and the upper structure in a state where the shearing deformation in the operating state is forcibly applied. be able to.

[Embodiment] A method of attaching and detaching a seismic isolation device of the present invention will be described in detail with reference to the drawings showing a preferred embodiment. FIG. 1 is a vertical sectional view of a foundation of a high-rise building. In the figure, 1 is a building, 2 is an upper structure, 3 is a foundation of a building 1, and a building 1 is a superstructure. The body 2 is supported by the seismic isolation device 4 on a plurality of pedestals 31 formed on the upper surface of the foundation 3. The reference numerals in FIGS. 3 and 4 are common to the corresponding parts.

On the upper surface of the pedestal 31, a sliding device 30 mainly including a lower sliding plate 32 and an upper sliding plate 33 is installed instead of the mounting plate 6 of the conventional seismic isolation device 4.

The lower slide plate 32 is a wedge-shaped plate body having a gentle slope formed on the upper surface, provided with a fixing portion 34 below both ends of the slope, and via the anchor bolt 7 formed on the cap nut 35,
The pedestal 31 is fixed over the upper surface, and a guide groove 36 is provided on the slope in the direction of the fixing unit 34.

The upper sliding plate 33 is a wedge-shaped plate having a gentle slope formed on the lower surface thereof corresponding to the upper surface of the lower sliding plate 32 and having an upper surface formed horizontally, and the upper surface supports the seismic isolation device 4. On the lower surface, a guide ridge 37 corresponding to the guide groove 36 of the lower slide plate 32 is provided so as to mesh with both, and both upper and lower slide plates 33, 32 are provided.
Is slidable, and when fixed by the bolt 38, the sliding device 30 becomes a base plate of the seismic isolation device 4.

The facing surfaces of the upper and lower sliding plates 33 and 32, the guide groove 36 and the guide ridge 37 are machined and then subjected to rust prevention treatment.
Bolt 38 slides lower sliding plate 32 and upper sliding plate 33
When they are overlapped in the installation state as 30, they reach the cap nut 35 of the anchor bolt 7. 39 is both fixing units 34
It is a reaction force rod stretched in between and buried in the concrete of the pedestal 31.

Next, the seismic isolation device 4 employed in the present invention is of a known type, and is a laminated rubber type in which a large number of steel plates and rubbers are alternately laminated. It has an upper flange 42 for fixing and a lower flange 43 on the lower surface, and is fixed to the mounting plate 6 of the upper structure 2 and the upper sliding plate 33 by fixing bolts 44 and 45, respectively. .

The seismic isolation device 4 includes a plurality of pedestals 31 on the upper surface of the foundation 3.
It is installed on the top, supports the entire seismic force of the upper structure 2 without increasing the amplitude in the vertical direction, and absorbs the horizontal seismic force by horizontal deformation.

Next, an attaching / detaching device of the seismic isolation device 4 used for installing the seismic isolation device 4 as described above will be described with reference to FIG. The attachment / detachment device 10 of the present invention is equipped with a main body 11 and a vertically movable unit with respect to the main body 11, and a laminated rubber type seismic isolation device 4 is mounted on an upper flange.
The fork 12 formed so as to be supported by 42 and the lower sliding plate 32 of the sliding device 30 installed on the pedestal 31 of the foundation 3 apply horizontal shearing deformation to the seismic isolation device 4 by expansion and contraction operation. , A double-acting jack 20 for applying a force to move the seismic isolation device 4 forward and backward, and columnar reaction force portions 13 and 14 for taking a reaction force for expansion and contraction of the jack 20.
Can move up and down along a lifting rail 15 provided on a reaction force portion 14 at the time of expansion and contraction.

Numeral 16 denotes a reaction force anchor which is connected to the outer end of the reaction force rod 39 and is automatically anchored to the front part of the main body 11, and takes a reaction force on the pedestal 31 when the jack 20 is extended. Thus, the retraction device 10 is prevented from retreating. The attachment / detachment device 10 is configured symmetrically with respect to the operation direction, but the fork 12 prevents the seismic isolation device 4 from rotating.
It is preferable to use two jacks 20 in terms of stability and capacity. Further, a prestressed steel material is used as a member related to the force of the jack 20.

The detachable device 10 of the seismic isolation device of the present invention is a self-propelled traveling body which is simultaneously used for handling and transporting the seismic isolation device 4 which is a heavy body, and has traveling wheels 17 below. Is provided with a leveling device 18 for the attachment / detachment device 10, and the height of the attachment / detachment device 10 as a whole can travel below the upper structure 2 on the upper surface of the foundation 3. 19 is a counterweight for stabilizing the seismic isolation device 4 during operation.

Needless to say, the mounting / removing method of the present invention and the structure of the mounting / removing device used in the method are not limited to the above embodiments. For example, the guide grooves 36 and the guide ridges are formed on the upper and lower sliding plates 33 and 32. 37 may be interchanged. If the seismic isolation device 4 is of a laminated rubber type, various types of laminated rubber can be used. The design constants of the seismic isolation device such as rated load, allowable displacement, horizontal rigidity, etc. It can be selected according to the size of the product.

[Operation] The operation of the method for attaching / detaching the seismic isolation device 4 of the present invention is described in connection with the construction of the pedestal 31 on which the seismic isolation device 4 is installed, the mounting of the seismic isolation device 4 on the upper surface thereof, and the escape from there. A description will be given based on the steps. In FIG. 1, a building 1 adopting the present invention is shown.
In the above, a gap is set between the upper surface of the pedestal 31 formed on the foundation 3 and the mounting plate 6 of the upper structure 2 corresponding to the standard height H of the seismic isolation device 4, Lower sliding plate 32
In order to make the distance between the upper surface of the sliding device 30 and the mounting plate 6 when the upper sliding plate 33 and the upper sliding plate 33 are superposed in a standard state equal to the rated height H of the seismic isolation device 4, A lower sliding plate 32 is provided on a pedestal 31.

On the other hand, in FIG. 2, the seismic isolation device 4 first fixes the lower flange 43 and the upper sliding plate 33 of the sliding device 30 with bolts 45, supports the upper flange 42 with the fork 12, and jacks the position. After raising and lowering the height relative to 20,
The jack head 21 of the jack 20 and the opposite end of the upper sliding plate 33 are connected by screwing a connecting rod 22. Here, if the jack 20 is contracted, the upper sliding plate 33 and the lower flange 43
Is deformed in the lower part of the seismic isolation device 4 in the direction of the attaching / detaching device 10, and along with this shearing deformation, the main body 41 of the seismic isolation device 4 decreases in the height direction, and H ′ and Become. Therefore, if the pedestal 31 is transported to the side of the pedestal 31 while being supported by the attaching / detaching device 10 in this state, as long as the upper structure 2 is maintained at the predetermined height H, the seismic isolation device 4 is moved below the upper structure 2. Insertion ability.

Here, the upper flange 42 is fixed to the mounting plate 6 by the fixing bolt 44, the jack 20 is gradually loosened, and when the horizontal spring force is released in a state of the self-balance of the main body 41 of the seismic isolation device 4,
The connecting rod 22 is unscrewed, removed, and the engagement between the upper sliding plate 33 and the jack 20 is released. Here, the return of the seismic isolation device 4 to its original shape acts in a direction to wedge the upper sliding plate 33 along the upper surface of the lower sliding plate 32. Then, the jack 20 is extended while applying a reaction force to the reaction force portion 13, and the reaction force anchor 16 is engaged with the pedestal 31 to prevent the entire detachment device 10 from retreating. Moving plate 33
Forcibly press-fits the upper slide plate 33 to a predetermined relation with the lower slide plate 32, and the bolt shown in FIG.
The connection by 38 becomes possible, and the state of the standard installation is automatically obtained.

When the existing seismic isolation device 4 needs to be replaced or maintained, the seismic isolation device 4 can be detached from the mounting device by generally performing the steps of the mounting method in reverse order. That is, the fixing bolts 38 of the upper and lower sliding plates 33 and 32 installed on the pedestal 31 are disengaged, and then the upper flange 42 of the seismic isolation device 4 is attached to the mounting plate 6 of the upper structure 2.
, The jack head 21 of the jack 20 of the attachment / detachment device 10 and the upper sliding plate 33 are connected by the connecting rod 22, and the upper portion of the seismic isolation device 4 is supported by the fork 12 and supported by the reaction force portion 14.
In the lower part, the jack 20 contracts while applying a reaction force to the pedestal 31, and the upper sliding plate 33 is pulled out, thereby giving horizontal shear deformation to the seismic isolation device 4, and
When switching to the full support of the forks 12 of 10, the deformed seismic isolation device 4 whose height has been reduced to H 'can be removed from the pedestal 31 while being supported by the attaching / detaching device 10.

[Effects of the Invention] The method of attaching and detaching a seismic isolation device of the present invention is a method of mounting a laminated rubber type seismic isolation device within a space between an upper structure and a lower surface of a building and an upper surface of a pedestal on a foundation. A step of installing a lower sliding plate of a sliding device comprising a pair of upper and lower wedge-shaped sliding plates on the upper surface of the pedestal; attaching an upper sliding plate of the sliding device to a lower flange of the seismic isolation device; Fixing, supporting the upper sliding plate fixed to the seismic isolation device with a fork of the detachable device, applying a relative horizontal force to the seismic isolation device, and applying a shearing deformation so that the seismic isolation device can be inserted into the gap.
A step of inserting a deformed seismic isolation device into the above-mentioned space while separately supporting the upper structure, a step of fixing an upper flange of the seismic isolation device to a lower structure of the upper structure, and a sheared seismic isolation The upper sliding plate fixed to the device is press-fitted along the lower sliding plate, and the seismic isolation device is restored to its original shape, and then the upper and lower sliding plates are fixed. The method according to the present invention comprises a detaching method in which the respective steps of the mounting method are performed in reverse order, and the present invention also constitutes a detachable device used in these methods. In addition, it is possible to contribute to a revolutionary method of attaching and detaching the seismic isolation device, which has not yet been planned, and the development of the attachment / detachment device. In addition, the structure is clear based on the function of the seismic isolation device in principle, has the advantage of being able to easily obtain construction accuracy without requiring any special technology, and not being restricted by the application position. is there. Further, although the present invention requires a small amount of material, it is particularly advantageous when employed in a building having a large number of seismic isolation devices. To play.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate the method of attaching and detaching the seismic isolation device of the present invention and the attachment and detachment device used in the method. FIG. 1 shows a state in which the seismic isolation device is mounted between the upper structure of the building and the foundation. FIG. 2 is a schematic front view similar to FIG. 1 illustrating the steps of a method of attaching / detaching the seismic isolation device and the operation of the attachment / detachment device, and FIGS. FIG. 1 ... building, 2 ... superstructure, 3 ... foundation, 4 ...
Seismic isolation device, 5 lifting jack, 6 mounting plate, 7
Anchor bolt, 8 mortar, 10 attachment / detachment device, 11
... body part, 1, 2 ... fork, 13, 14 ... reaction part of jack, 15 ... elevating rail, 16 ... reaction force anchor, 17
... running wheels, 18 ... leveling device, 19 ... counterweight, 20 ... jack, 21 ... jack head, 22
…… Connecting rod, 30… Sliding device, 31 …… Pedestal, 32…
... lower sliding plate, 33 ... upper sliding plate, 34 ... fixing unit, 35 ...
... Cap nut, 36 ... Guide groove, 37 ... Guide ridge, 38 ... Fixing bolt, 39 ... Reaction force rod, 41 ... Main body, 42 ... Upper flange, 43 ... Lower flange, 44 , 45 ... fixing bolt,
H, H '... Height of the seismic isolation device.

Claims (4)

(57) [Claims] 1. A method of mounting a laminated rubber type seismic isolation device in a space between a lower surface of an upper structure of a building and an upper surface of a pedestal on a foundation, wherein a pair of upper and lower wedge-shaped sliding members are mounted on the upper surface of the pedestal. A step of installing a lower sliding plate of a sliding device made of a plate; a step of fixing an upper sliding plate of the sliding device to a lower flange of the seismic isolation device; A process in which the upper diaphragm is supported by a fork of a detachable device, and a relative horizontal force is applied to the seismic isolation device to apply a shearing deformation so that the upper structure can be inserted into the above-mentioned space. Inserting the seismic isolator into the space, fixing the upper flange of the seismic isolator to the lower surface of the upper structure, and moving the upper sliding plate fixed to the sheared seismic isolator along the lower sliding plate. Press-fit to restore the seismic isolation device to its original shape. Mounting method of seismic isolation device characterized in that it comprises the step of fixing the sliding plate parts. 2. A method for removing a laminated rubber-type seismic isolation device installed between a superstructure of a building and a pedestal of a foundation through an ugly device. The process of disengaging the fixing of the sliding plate, using the detachable device, pulling out the upper sliding plate while applying a reaction force to the lower sliding plate to apply horizontal shear deformation to the seismic isolation device and A step of releasing the upper flange from the upper structure using a fork of the detachable device, and a step of detaching from the pedestal while supporting the deformed seismic isolation device with the detachable device. How to escape. 3. An attaching / detaching device used in the attaching / detaching method of the seismic isolation device according to claim 1 or 2, wherein the attaching / detaching device is equipped with a main body, and is capable of moving up and down with respect to the main body. The seismic isolation device is attached to the fork that can support the seismic isolation device and the upper diaphragm of the sliding device installed on the base pedestal. An attachment / detachment device for a seismic isolation device for use in a method for attaching / detaching a seismic isolation device, comprising a jack for moving the device forward and backward, and a reaction force portion for expanding and contracting the jack. 4. A detachment device for a seismic isolation device according to claim 3, wherein the main body is provided with a running means and a counterweight for the seismic isolation device supported by a fork.