JP6535514B2 - Seismic isolation device structure and installation method of seismic isolation device - Google Patents

Description

  The present invention relates to, for example, a seismic isolation device structure in which seismic isolation is improved by incorporating a seismic isolation device between an existing structure and a concrete base, and a mounting method of the seismic isolation device.

As a base isolation structure, what supports an upper structure to a foundation, a lower structure, etc. via a base isolation device is known. In this type of seismic isolation structure, the seismic isolation device is deformed slowly and greatly to the lower structure that vibrates by the earthquake motion at the time of earthquake occurrence, and the seismic motion input to the upper structure is reduced by displacing the seismic motion. It is supposed to be.
For example, in the seismic isolation device described in Patent Document 1, the seismic isolation device is disposed between a structure and a concrete foundation to reduce transmission of ground vibration to the structure in the event of an earthquake. Also, the structure is connected to a damping means attached to a concrete foundation to exert a damping force on horizontal vibration of the structure, and when the input to the damping means exceeds a predetermined value, the structure and the damping means I try to release the connection with.

By the way, as a method of installing the seismic isolation device in the existing structure, for example, the part which should install the seismic isolation device between a foundation floor and an existing pillar is cut up and jacked up, and seismic isolation is carried out to the space which cut and removed. A seismic isolation retrofit method is known in which equipment and supporting steel are installed to jack down the existing columns of the existing structure.
For example, when the existing structure is a station building accommodating communication broadcasting equipment, relay equipment, etc. installed outdoors, communication, broadcasting, etc. are often performed for almost 24 hours except for short interruptions. In order to prevent the cable for communication, the cable for broadcasting, etc. from being cut off, work has been carried out to install a seismic isolation system.

  In the case of adopting the seismic isolation retrofit method in such an existing station building, for example, as shown in FIG. 6, a channel material fixed to the lower part of the existing station building 100 accommodating communication broadcasting equipment, relay devices, etc. The space between 101 and the concrete base 102 is cut off and jacked up, the seismic isolation device 103 is installed on the concrete base 102, and a reinforcing material 104 such as H steel is installed. Thereafter, the existing station building 100 is jacked down and the channel material 101 and the reinforcing material 104 are fixed by bolts and nuts or the like.

JP-A-9-268574

However, in the existing station building 100 described above, in order to insert the seismic isolation device 103 and the reinforcing member 104 between the same and the concrete base 102, it is necessary to lift the station building 100 by, for example, 200 mm or more by a jack. On the other hand, the existing cables for communication, broadcasting, etc. laid in the central office 100 extend from the lower side or from the side into the central office 100 and have a length that can withstand a jackup of 200 mm or more. I could not afford it. Therefore, it is difficult to retrofit installation of the seismic isolation device 103 in the existing station building 100 in which such a communication cable or the like is laid.
In addition, even in the case of jacking up the local building 100 by temporarily cutting the communication cable etc., while installing the seismic isolation device 103 and the reinforcing material 104 on the concrete base 102, it is not possible to jack down, interrupting communication and broadcasting. Since it had to be done, construction in the jack-up state over a long period of time was difficult.

  The present invention has been made in view of such circumstances, and it is possible to install the seismic isolation device structure and the seismic isolation device such that the seismic isolation device can be installed in a short time without jacking up the structure high. Intended to provide a method.

The seismic isolation device structure according to the present invention comprises a slide member installed on a concrete base, a reinforcing member installed between the slide member and a structure on the upper side thereof and capable of sliding relative to the slide member; A seismic isolation device installed in a portion of the reinforcing member extending to the outside of the structure, the seismic isolation device being flush with the reinforcing member on the same plane as the concrete base on which the sliding member is installed It is characterized by being installed .
According to the seismic isolation device structure according to the present invention, the sliding friction function between the sliding member and the reinforcing member exerts a stable supporting function during normal times and earthquakes to support the structure, and vibration occurs in the horizontal direction due to the earthquake. In this case, when an earthquake force larger than the predetermined frictional resistance acts between the sliding member and the reinforcing member in contact with each other, the reinforcing member slides relative to the sliding member together with the structure, and the load due to the movement of the reinforcing member The seismic isolation device that has received the transmission is displaced to attenuate the seismic force and to restore the reinforcing member to its original position.

Moreover, the seismic isolation apparatus is connected between the concrete base and the reinforcement member .
In this case, the seismic isolation device supported on the concrete base receives the vibration of the reinforcing member and is displaced and damps the seismic force by the damping function.

In the seismic isolation device structure according to the present invention , the sliding member installed on the concrete base and the sliding member and the structure above the sliding member can be slid relative to the sliding member. And a support member fixed to a side wall of the concrete base , the seismic isolation device comprising a reinforcement member, a seismic isolation device installed at a portion of the reinforcement member extending to the outside of the structure , and the seismic isolation device It is characterized in that it is connected between the reinforcing member.
Even if the space of the concrete base on which the structure is to be installed is relatively narrow, the support member is installed at a position opposite to the reinforcement member extending and extending from the side wall of the concrete base and the seismic isolation device is attached between Therefore, in the event of an earthquake, the seismic isolation function can be exhibited. Moreover, since the seismic isolation system does not directly bear the vertical load of the structure, it can be made thinner.

The seismic isolation device mounting method according to the present invention comprises the steps of separating the existing structure from the concrete base and jacking it up, the steps of fixing the slide member on the concrete base, and the reinforcement projecting outside the existing structure. The step of mounting the member relative slideably on the slide member, the step of jacking down the existing structure on the reinforcing member, and the seismic isolation between the reinforcing member and the concrete base outside the existing structure Fixing the device.
According to the present invention, since the seismic isolation device is not installed between the concrete base and the existing structure but installed outside the existing structure, the height of the jack up can be set lower than in the prior art, and the jack down is Since the time can be shortened, the load and load on the structure can be reduced. Moreover, since the seismic isolation device is fixed between the reinforcing member and the concrete base after jacking down, the time to jacking down can be shortened also in this respect. Moreover, since the seismic isolation system does not directly receive the vertical load of the existing structure, it can be made thinner.

Further, in the seismic isolation apparatus mounting method according to the present invention, the existing structure is separated from the concrete base and jacked up, the step of fixing the sliding member on the concrete base, and the protrusion on the outside of the existing structure Mounting the reinforcing member on the sliding member so as to be able to slide relative to each other, jacking down the existing structure on the reinforcing member, and supporting the outside of the existing structure fixed to the side wall of the concrete base Fixing the seismic isolation device between the member and the reinforcing member.
In the present invention, even when the distance to the side wall of the concrete base that supports the existing structure is short, by fixing the support member to the side wall, it is possible to isolate the vibration isolation between the existing structure and the reinforcing member protruding outside. The device can be fixed.

  According to the seismic isolation device structure according to the present invention, the seismic isolation device is installed in the reinforcing member extended to the outside of the structure, so the seismic isolation device can be installed in parallel with the sliding member, and the jackup height is reduced. The up time can be shortened, the load and load on the structure can be reduced, and the enlargement of the seismic isolation device structure can be suppressed. In addition, since the seismic isolation device does not directly bear the load of the structure, it is possible to realize the thinning of the seismic isolation device.

Further, in the seismic isolation device mounting method according to the present invention, the seismic isolation device in which the existing structure is installed on the slide member with the existing structure jacked up and connected to the reinforcing member on the outside thereof is placed on the concrete base. It can be installed.
Further, in the seismic isolation device attaching method according to the present invention, the seismic isolation device can be installed on the reinforcing member outside the existing structure after the existing structure is jacked down.
Therefore, the height of the jack-up can be reduced and the jack-up time can be shortened to reduce the load and load on the existing structure, and since the seismic isolation device does not directly bear the load of the structure, thinning of the seismic isolation device Can be realized.

It is an important section sectional view showing the seismic isolation system structure of the central office according to a first embodiment of the present invention. It is a principal part top view which shows the seismic isolation apparatus structure in the central office shown in FIG. It is principal part sectional drawing which shows the floating | lifting prevention tool shown in FIG. It is a flowchart which shows the procedure of the attachment method of the seismic isolation apparatus which retrofitly installs a seismic isolation apparatus in the central office by embodiment. It is principal part sectional drawing which shows the seismic isolation apparatus structure of the local office by 2nd embodiment of this invention. It is principal part sectional drawing which shows the conventional seismic isolation apparatus structure.

Hereinafter, the seismic isolation device structure of the central office 1 according to each embodiment of the present invention will be described with reference to the attached drawings.
1 to 4 show the seismic isolation device structure of a central office 1 according to a first embodiment of the present invention. In FIG. 1, a central office 1 is, for example, a box-shaped building in which a device for broadcasting and communication, a repeater and the like are installed inside, and is connected to the outside by a communication cable, a cable for broadcasting, and the like. Then, a substrate 4 made of, for example, a steel material is fixed, for example, by an anchor member on a concrete base 2 installed on the ground, and a slide made of a steel sheet and a support 5 made of, for example, steel material The member 3 is integrally installed. The support 5 is fixed to the substrate 4 by welding, for example. Further, a reinforcing frame member 6 is disposed on the slide member 3, and a friction plate 7 made of, for example, a stainless steel plate that contacts the slide member 3 is fixed to the lower surface of the reinforcing frame member 6.

The slide member 3 has a low coefficient of friction μ and is made of, for example, tetrafluoroethylene resin. By setting the coefficient of friction μ of the sliding member 3 in advance appropriately, the friction plate 7 fixed on the lower surface of the reinforcing frame 6 is held stationary on the sliding member 3 if the earthquake force is smaller than a certain scale. The seismic isolation horizontal movement is caused relative to the friction plate 7 above the seismic force of the scale. The sliding member 3 is set to a thickness of, for example, about 2.4 mm, and the thinning of the sliding friction mechanism 13 is realized. The substrate 4 is fixed to the concrete base 2 directly or on the base of the existing non-shrinkage mortar by anchor bolts and nuts (not shown).
Further, the reinforcing frame member 6 is made of, for example, a steel material, and is a flat support plate 6a, a fixing receiving portion 6b formed on the upper surface thereof in a substantially L shape, for example, a fixing receiving portion 6b and a supporting plate 6a. And a support bracket 6c connecting the two. The lower surface 8a of the existing channel frame 8 abuts on the upper portion of the fixed receiving portion 6b and is fixed by bolts and nuts, and the existing office building 1 is installed and connected to the upper surface 8b of the channel frame 8. Further, on the lower surface of the support plate 6a, a friction plate 7 made of, for example, a stainless steel plate to be placed on the slide member 3 is installed.

Further, in the reinforcing frame 6, the support plate 6a extends from the inside to the outside of the central office 1, the sliding member 3 is installed directly below the central office 1, and the seismic isolation device 10 is connected to the outer side. The seismic isolation device 10 is made of, for example, an acrylic viscoelastic material, high damping rubber, etc. The upper portion is connected to the support plate 6 a and the lower portion is connected to the base plate 11. The base plate 11 is fixed to the concrete base 2 by an anchor bolt or the like. The seismic isolation device 10 is thin and has a high durability, for example, about 5 mm in thickness, and secures a small volume, horizontal rigidity (restoring function) and an ultra-high damping function of vibration during an earthquake.
Therefore, the sliding means 9 and the seismic isolation device 10 are installed in parallel between the concrete base 2 and the friction plate 7 of the reinforcing frame 6, and the sliding member 3 and the friction plate 7 of the reinforcing frame 6 are installed. The sliding friction mechanism 13 is configured in FIG. The thickness from the concrete base 2 to the friction plate 7 is set to a small height of, for example, about 20 mm. Further, the height from the concrete base 2 to the channel frame 8 is set to, for example, 90 mm.

The reinforcement frame member 6 is at rest due to the friction between the sliding member 3 having a coefficient of friction μ and the friction plate 7 and, in the case of an earthquake, for example, at seismic intensity 5 or less, the frictional force is superior to the seismic force and held stationary. In the case of 5 or more, the reinforcing frame member 6 relatively horizontally slides out and vibrates by overcoming the frictional force with the sliding member 3.
When the reinforcing frame member 6 vibrates, the vibration damping function of the seismic isolation device 10 can exhibit a damping function of vibration and a restoring function of returning the reinforcing frame member 6 to the original position. Therefore, in the present embodiment, the performance of the seismic isolation performance by the seismic isolation device 10 is limited to a large earthquake with a seismic intensity of 5 or more. However, by adjusting the coefficient of friction μ of the sliding member 3 and the material of the friction plate 7, it is possible to adjust the sliding function in which the friction plate 7 starts horizontal movement to an appropriate magnitude of seismic force.

  Next, FIG. 2 is a plan view of relevant parts showing the arrangement of the channel frame 8 supporting the central office 1 and the seismic isolation device 10. In the figure, the channel frame 8 is formed in, for example, a quadrilateral frame shape in accordance with the planar shape of the station building 1, and the sliding friction mechanism 13 is installed at a position overlapping the channel frame 8 at each corner and its middle part The seismic isolation device 10 is installed on the outside of the channel frame 8. Moreover, the seismic isolation devices 10 are disposed to face both ends of two opposing sides of the channel frame 8 respectively.

Then, the substrate 4 of the slide member 3 is fixed to the concrete base 2 as a sliding member fixing iron plate at each corner of the channel frame 8 and the middle portion thereof. Further, the floating preventing members 15 are respectively installed in the middle portions of the sides of the channel frame 8. As shown in FIG. 3, the floating preventing member 15 is formed in, for example, a long plate shape, and the surface on one end side overlaps the supporting plate 6 a of the reinforcing frame member 6 and abuts slidably. The other end portion protrudes outward from the support plate 6 a and is curved in a substantially U shape and fixed to the concrete base 2 by an anchor bolt 16.
By this, when a large earthquake exceeding the assumption occurs and the reinforcing frame 6 vibrates greatly and an excessive load is applied to the seismic isolation device 10, the uplift preventing member 15 forces the reinforcing frame 6 as a fail safe mechanism. Constitute a stopper steel material to be stopped.

The seismic isolation device structure of the central office 1 according to the present embodiment has the above-described configuration, and next, a method of attaching the seismic isolation device 10 will be described along the seismic isolation device structure shown in FIG. 1 and the flowchart shown in FIG. .
Assuming that the existing channel frame 8 is fixed directly on the concrete base 2 (or on the non-shrink mortar) by the anchor bolt in the existing station building 1, the channel frame 8 of the station building 1 and the concrete base 2 The nut of the anchor bolt which connects is removed, it is made to separate, and the local building 1 and the channel frame 8 are jacked up (step 1). At this time, the jack-up height of the channel frame 8 is set to about 100 mm, which is about half of the conventional jack-up height. Then, the attachment portion of the channel frame 8 such as the tip of the anchor bolt projecting onto the concrete base 2 is cut off (step 2).

Then, the substrate 4 on which the sliding member 3 and the support 5 are fixed in advance is fixed to the concrete base 2 (step 3), and the reinforcing frame 6 on which the friction plate 7 is fixed in advance to the lower surface is installed on the sliding member 3 (Step 4). A part of the reinforcing frame member 6 protrudes to the outside of the channel frame 8, and the seismic isolation device 10 and the base plate 11 are connected to the lower side in advance at the outside portion of the support plate 6 a. In this state, the upper end of the reinforcing frame 6 is set to a height of, for example, 90 mm.
Next, the local building 1 and the channel frame 8 are jacked down (step 5), and the fixing receiving portion 6b of the reinforcing frame member 6 and the lower surface 8a of the channel frame 8 are fixed by bolts and nuts. And the base plate 11 of the seismic isolation apparatus 10 installed in the concrete base 2 is fixed to the concrete base 2 by an anchor bolt etc. (step 6). Thus, as shown in FIG. 1, the seismic isolation device structure can be constructed on the existing station 1.

Next, the operation of the seismic isolation device structure of the central office 1 according to the present embodiment will be described.
As shown in FIG. 1 and FIG. 2, when an earthquake occurs in the state where the seismic isolation device structure of the local building 1 is adopted, the sliding member 3 and the reinforcement frame are stronger than the seismic force when the seismic intensity is less than 5 Since the sliding friction resistance between the material 6 and the friction plate 7 is larger, it does not move relative to one another and vibrates in a horizontal direction integrally, and the central office 1 also vibrates integrally via the channel frame 8.

When the seismic intensity of the earthquake is 5 or more, the seismic force exceeds the sliding frictional resistance between the sliding member 3 and the friction plate 7 of the reinforcing frame 6, so the support plate 6a of the reinforcing frame 6 is the sliding member 3 Relative to each other and vibrate in the horizontal direction, and the station building 1 also vibrates integrally via the channel frame 8. Then, the seismic isolation device 10 is displaced in response to the vibration of the reinforcing frame member 6 to attenuate the vibrations of the reinforcing frame member 6 and the channel frame 8 and the local building 1 and to exert a restoring function for returning to the original position. .
Therefore, by setting the friction coefficient μ between the sliding member 3 and the friction plate 7 appropriately, the seismic isolation device 10 causes relative horizontal movement in the local building 1 with respect to seismic force of a certain scale or more, and the seismic isolation. The high damping function and the restoration performance by the device 10 can exhibit seismic isolation performance.

As described above, according to the seismic isolation device structure of the central office 1 according to the present embodiment and the attachment method thereof, the small and thin seismic isolation system 10 is mounted on the support plate 6a of the reinforcing frame 6 extending outside the central office 1. Since the jack-up is installed in parallel with the sliding means 9, the height of the jack-up can be reduced to shorten the jack-up time, and the seismic isolation device structure can be constructed in a short time.
Therefore, the load and load on the station 1 and the cable for communication and broadcasting due to jack-up can be reduced at the time of construction, so interruption of communication, broadcasting, etc. of the station 1 can be suppressed in a short time. And cutting or the like of the cable for communication, broadcasting, etc. laid.

Moreover, since the seismic isolation device 10 is installed on the outside of the sliding member 3 that supports the local building 1, the vertical load bearing of the local building 1 can be eliminated and the seismic isolation device 10 can be thinned along with the sliding friction mechanism 13. The device structure can also be thinned. Furthermore, since the seismic isolation device 10 can be fixed after jack down on the outside of the central office 1, installation is easy and can be performed in a short time, and the jack up time can be shortened also in this respect.
Furthermore, horizontal sliding movement is caused in a large earthquake of a certain scale or more by the setting value of the friction coefficient μ of the sliding member 3 in the sliding friction mechanism 13, and it is possible to exhibit seismic isolation performance by high damping function and restoration performance.

  The present invention is not limited to the seismic isolation device structure of the central office 1 according to the first embodiment described above, and appropriate changes, replacements, and the like can be made without departing from the scope of the present invention. Both are included in the present invention. Hereinafter, other embodiments and modifications of the present invention will be described. The same or similar parts and members as those of the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.

Next, a seismic isolation device structure of a central office 1 according to a second embodiment of the present invention will be described based on FIG.
In FIG. 5, when the concrete base 2 which is the foundation of the local building 1 is narrow and it is impossible to secure a sufficient site for installing the seismic isolation system 10 outside the local building 1, the vertical side wall 2 a of the concrete base 2 The support plate 6a of the reinforcement frame member 6 is made to project from it, and the seismic isolation apparatus 10 previously fixed to the lower surface is suspended. Then, a bracket 20 having a triangular frame shape in side view, for example, is installed as a support member on the side wall 2a of the concrete base 2, and the vertical frame portion 20a is abutted, and the anchor bolt 21 is driven in and fixed.
Accordingly, the upper surface 20b of the bracket 20 is preferably set flush with the upper surface of the concrete base 2. Moreover, the base plate 11 of the seismic isolation device 10 is supported in contact with the upper surface 20 b of the bracket 20. In this state, the base plate 11 and the upper surface 20b of the bracket 20 may be fixed with a bolt, a nut or the like.

  Also in the second embodiment, in the mounting method of the seismic isolation device structure, the reinforcing frame 6 in which the substrate 4, the support 5, the slide member 3 and the friction plate 7 are fixed on the lower surface on the concrete base 2 by jacking up. Can be jacked down after installation. Then, in this state, the base plate 11 of the seismic isolation device 10 may be connected by attaching the bracket 20 in a state in which the outside portion of the reinforcement frame member 6 suspended from the seismic isolation device 10 is projected from the side wall 2a.

Moreover, in the seismic isolation device structure of the central office 1 according to the second embodiment described above, the upper surface 20b of the bracket 20 fixed to the side wall 2a of the concrete base 2 does not have to be flush with the upper surface of the concrete base 2 It may be installed at a position lower or higher than this.
Further, in the above-described mounting method of the seismic isolation device structure, after the local building 1 and the channel frame 8 are jacked down, the bracket 20 is fixed to the side wall 2 a of the concrete base 2 and fixed to the lower surface of the reinforcing frame 6 Instead of connecting the base plate 11 of the vibration device 10 and the upper surface 20b of the bracket 20, the bracket 20 is fixed to the side wall 2a of the concrete base 2 before placing the reinforcing frame 6 on the slide member 3. You may leave it.

In the present invention, the reinforcing frame member 6 including the friction plate 7 is included in the reinforcing member.
Moreover, in each embodiment mentioned above, although the friction plate 7 was fixed to the lower surface of the reinforcement frame material 6, it is not necessary to install the friction plate 7. FIG. In that case, the support plate 6a of the reinforcing frame 6 constitutes a friction plate. In the sliding means 9, the sliding member 3 may be omitted and the function of the sliding member 3 may be exhibited by the support 5. Alternatively, the sliding member 3 and the support 5 may be omitted and the function of the sliding member 3 may be exhibited by the substrate 4. In this case, the substrate 4 constitutes the sliding means 9.
Furthermore, in the present invention, the seismic isolation device structure in which the sliding friction mechanism 13 and the seismic isolation device 10 are installed in the local office 1 where communication cables, broadcasting cables, etc. are laid inside and outside has been described. The present invention is not limited to the above, and can be applied to a structure or an existing structure including other appropriate buildings and the like. In the present invention, the structure or the existing structure includes the channel frame 8 described above.
Moreover, although the seismic isolation apparatus structure and the attachment method by this invention demonstrated the structure which installs the seismic isolation apparatus 10 in an existing structure, it is applicable to the structure which installs the seismic isolation apparatus 10 in a new structure. Nor.

DESCRIPTION OF SYMBOLS 1 Local building 2 Concrete base 2a Side wall 3 Sliding member 4 Substrate 5 Support stand 6 Reinforcement frame 6a Support plate 7 Friction plate 8 Channel frame 9 Sliding means 10 Seismic isolation device 11 Base plate 20 Bracket

Claims (4)

A sliding member installed on a concrete base,
A reinforcing member disposed between the sliding member and the structure above the sliding member and capable of sliding relative to the sliding member;
A seismic isolation device installed at an outwardly extending portion of the structure in the reinforcing member;
A vibration isolation device structure comprising: the vibration isolation device installed between the reinforcing member and the concrete base on which the slide member is installed on the same plane . A sliding member installed on a concrete base,
A reinforcing member disposed between the sliding member and the structure above the sliding member and capable of sliding relative to the sliding member;
A seismic isolation device installed at an outwardly extending portion of the structure in the reinforcing member;
A support member fixed to the side wall of the concrete base ,
The seismic isolation device structure is characterized in that the seismic isolation device is connected between the support member and the reinforcing member. Separating the existing structure from the concrete base and jacking up;
Securing the sliding member on the concrete base;
Placing a reinforcing member protruding outward of the existing structure relative slideably on the slide member ;
Jacking down the existing structure onto the reinforcing member;
Fixing the seismic isolation device between the reinforcing member and the concrete base outside the existing structure;
The seismic isolation apparatus attachment method characterized by having. Separating the existing structure from the concrete base and jacking up;
Securing the sliding member on the concrete base;
Placing a reinforcing member protruding outward of the existing structure relative slideably on the slide member ;
Jacking down the existing structure onto the reinforcing member;
Fixing the seismic isolation device between the support member fixed to the side wall of the concrete base outside the existing structure and the reinforcing member;
The seismic isolation apparatus attachment method characterized by having.

Images