JP4844930B2 - Extension method of seismic isolation building - Google Patents

Description

  The present invention relates to an extension method for adding an extension part to an upper layer part of a base-isolated building after it has been newly built and started its service.

In the case of adding an extension to the upper part of an existing building, it is generally necessary to reinforce or renovate the existing part, but Patent Document 1 requires almost no reinforcement or renovation of the existing part. An extension method that enables large-scale extension has been proposed.
This is because an intermediate seismic isolation layer that is relatively stiffer than other layers is installed in any layer of the extension or existing part, so that the middle seismic isolation layer absorbs most of the seismic energy. It is.
JP 2001-32534 A

  The conventional extension method described above can be said to make the entire extension part function as a mass in a dynamic damper, so that the entire building after extension is seismically isolated. It requires extremely high level of analysis, and it cannot be applied effectively when existing buildings are not supposed to be seismically isolated by such extension, and it has not spread widely.

  In view of the above circumstances, an object of the present invention is to provide an effective and appropriate extension method that can reasonably add a base-isolated building.

  The present invention is an extension method for adding an extension part to the upper part of the seismic isolation building after newly constructing a seismic isolation building supported by seismic isolation by a seismic isolation device, and starting its service, When a seismic isolation building is newly constructed, a two-stage seismic isolation device that connects an upper seismic isolation device and a lower seismic isolation device is installed as a seismic isolation device for isolating and supporting the seismic isolation building. When the natural period of the seismic isolation building is adjusted by the seismic isolation device and an extension is added to the upper layer of the seismic isolation building, the upper or lower It is characterized by re-adjusting the natural period of the seismically isolated building as a whole by restraining any one of the seismic devices inoperable.

  In the present invention, the upper-stage seismic isolation device and the lower-stage seismic isolation device in the two-stage seismic isolation device installed at the time of new construction are both composed of laminated rubber, and at the time of extension, one of these two-tiered laminated rubber is restrained. It may be constrained by a jig, or one of the upper and lower seismic isolation devices may be a laminated rubber and the other may be a sliding bearing, and the sliding bearing may be restrained by a restraining jig during extension.

  According to the present invention, when a seismic isolation building is newly constructed, it is designed in advance so as to allow for the extension, so that, in addition to the extension, it is possible to almost eliminate the need for repairs and reinforcements to existing parts, and in particular, the seismic isolation device. By installing a two-stage seismic isolation device with upper and lower seismic isolation devices and operating both the upper and lower seismic isolation devices at the time of new construction, It is possible to easily readjust the natural period of the entire building accompanying the extension.

An embodiment of the present invention will be described with reference to FIGS.
In the present invention, when a seismic isolation building is newly constructed, the expansion plan is specifically determined in advance, assuming that it will be expanded later, and at the time of expansion, renovation and reinforcement of existing parts are made unnecessary as much as possible. It is based on setting the specifications for new construction in advance.
Specifically, in the present invention, on the assumption that an extension part will be built on the upper layer after a seismically isolated building is newly built and started to operate, the increase in building weight that will increase due to the extension is anticipated at the time of new construction. In addition to optimally setting the structure and strength of the frame and frame, the main purpose is to use the seismic isolation device installed at the time of the new construction as it is even after the extension by simply re-adjusting it.

  FIG. 1 shows a newly built seismic isolation building 1. This seismic isolation building 1 was installed on the foundation 2 with seismic isolation support 3 and was newly built as an independent building with a function that can be used for the required purposes. Although it is started, it is designed in anticipation of an extension to the upper layer at a later date as described above, and the following structure is adopted as the seismic isolation device 3.

As shown in FIG. 1B, the seismic isolation device 3 according to the present embodiment is formed by stacking two layers of laminated rubber as the upper seismic isolation device 3A and laminated rubber as the lower seismic isolation device 3B and integrally connecting them. It is of the structure which was made.
When this new seismic isolation device 3 is newly built, the bottom plate of the laminated rubber as the upper-stage seismic isolation device 3A and the top plate of the laminated rubber as the lower-stage seismic isolation device 3B are joined together by bolt fastening, so that they are substantially integrated. It is supposed to function as a laminated rubber, and the natural period of the base-isolated building 1 at the time of new construction is optimized by interposing it between the base-isolated building 1 and the foundation 2 and supporting the base-isolated building 1 as a whole. It has been adjusted to.

Although the seismic isolation building 1 in the illustrated example is schematically shown as having a three-story ramen frame composed of columns, beams, slabs, and roofs on each floor, the structure and internal plan is the desired application. For example, if the application is a data center, the majority of each floor is reserved as a large server installation space, and related rooms and machine rooms are used as necessary. The core portion or the like may be provided at a desired position.
In any case, the design and construction of the base-isolated building 1 are preferably performed by making full use of highly standardized and standardized industrialization techniques. Specifically, the foundation 2 is a simple mat base, and the structural members such as columns and beams are made of general-purpose steel products as much as possible. As far as possible, the field work will be reduced as much as possible by using the full precast construction method, and ready-made products will be used as much as possible for all elements of the interior and exterior materials and attached equipment as well as the seismic isolation device 3 At the same time, it is preferable to streamline and simplify the construction by advanced unitization and prefabrication, and to cut costs by early ordering and mass ordering for material procurement.
By making full use of such industrialization techniques, it is possible to construct the seismic isolation building 1 at an extremely short construction period and at a sufficiently low cost, and it is possible to start operation immediately.

After the above-described seismic isolation building 1 is newly built and its service is quickly started, as shown in FIG. 2, an extension that is assumed in advance is performed at a necessary time (the example shown is three layers on the upper layer of the seismic isolation building 1). The extension part 4 of the minute is constructed).
It is preferable that the extension part 4 is basically designed and constructed by an industrialization method as in the case of the new construction of the seismic isolation building 1 described above, so that it can be extended at a very short construction period and at a low cost. However, after the extension, the existing part and the extension part 4 are structurally and functionally integrated, and the whole functions as a single base-isolated building.

And since such extension is already expected when the seismic isolation building 1 is newly constructed, it is possible to eliminate the need for repair and reinforcement of the existing part with the extension, but the weight of the extension part 4 is It is inevitable that the natural period of the entire building fluctuates before and after the extension by the amount added to the building. Therefore, it is necessary to readjust the seismic isolation device 3 to obtain the optimal seismic isolation effect even after the extension. .
Therefore, in this embodiment, as shown in FIG. 2 (b), the restraining jig 5 is attached to the upper seismic isolation device 3A to make it inoperable, so that only the lower seismic isolation device 3B operates during an earthquake after extension. It shall be. Such readjustment of the seismic isolation device 3 naturally increases the overall rigidity of the seismic isolation device 3, and therefore can compensate for fluctuations in the natural period associated with the increase in building weight due to the extension and easily achieve the optimum natural period after the extension. It is possible to readjust.
In other words, the specifications of the upper-stage seismic isolation device 3A and the lower-stage seismic isolation device 3B may be set in advance so that fluctuations in the natural period associated with the extension can be offset by the above-described readjustment at the time of extension.

According to the above extension method, it is possible to construct the new seismic isolation building 1 and the subsequent extension sufficiently in a short construction period and at a low cost. After the construction is completed early and delivered to the client as soon as possible, the upper part of the extension part 4 can be continuously constructed. After that, it is possible to respond quickly to demand fluctuations by extension, and since it is designed in advance for the extension at the time of new construction, there is almost no need to renovate or reinforce the existing part with the extension. For example, it is extremely effective as an extension method for buildings with demand fluctuations such as data centers.
In particular, since the two-stage seismic isolation device 3 is installed in advance at the time of new construction and it is possible to easily readjust the natural period only by restraining the first stage at the time of extension, There is no need for troublesome seismic isolation design.

  Although one embodiment of the present invention has been described above, the above embodiment is merely a suitable example, and the point is that when building a seismic isolation building 1 specifically, an extension to an upper layer at a later date is specifically planned. In the case of a new construction, a two-stage seismic isolation device may be installed as the seismic isolation device 3 and the natural period may be readjusted accordingly at the time of extension, as long as it does not depart from the gist of the present invention. The present invention is not limited to the above-described embodiment, and appropriate design changes and applications as listed below, for example, are possible.

In the above embodiment, the use of the seismic isolation building 1 is assumed to be, for example, a data center, and initially it was planned to be 3 stories and then 6 stories after expansion. Needless to say, the scale, form, and structure, specifically the flat area, floor plan, number of floors, floor height, column assignment, and other design specifications are arbitrary.
In addition, as described above, it is preferable that the new construction part and the extension part have the same specifications and specifications as much as possible and are designed and constructed by the same industrialization method. If the conditions required for each of the extension parts are different, it is sufficient to design them optimally. As a result, they may have different forms, scales, structures, design specifications, and construction methods. .

  In the above embodiment, both the upper seismic isolation device 3A and the lower seismic isolation device 3B constituting the seismic isolation device 3 are made of laminated rubber, and the upper laminated rubber is restrained at the time of extension. The same applies when the laminated rubber is restrained.

In addition, the seismic isolation device 3 is not limited to the laminated rubber in both stages, and other types of seismic isolation devices can be employed. For example, as shown in FIG. 3B) is a sliding bearing, so that the entire seismic isolation device 3 slides on the foundation 2 as shown in (a) at the time of new construction, and the sliding bearing is restrained as shown in (b) at the time of extension. In this case, the same effect as the above embodiment can be obtained.
In addition, although the readjustment of the seismic isolation device 3 as described above at the time of extension may be performed for all the seismic isolation devices 3, only a part of the seismic isolation devices 3 may be readjusted. High-precision readjustment can also be performed.
In that case, it is preferable to divide all the seismic isolation devices into two groups, a group that re-adjusts and a group that does not re-adjust, and to distribute the seismic isolation devices of each group evenly, for example, as shown in FIG. As an example, if there are 9 seismic isolation devices 3 in total, divide them into 2 groups of 5 groups indicated by black circles and 4 groups indicated by white circles. Re-adjustment at the time of extension should be performed for the target.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view showing a state of new construction and a detailed view of a seismic isolation device. It is sectional drawing which shows the state after extension, and the detail drawing of a seismic isolation apparatus. It is a figure which shows the other structural example of a seismic isolation device.

Explanation of symbols

1 Base-isolated building (existing part)
2 Foundation 3 Seismic isolation device 3A Upper seismic isolation device 3B Lower seismic isolation device 4 Extension part 5 Restraint jig

Claims (3)

An extension method for adding an extension part to the upper part of the base-isolated building after newly building a base-isolated building supported by the base isolation device and starting its service,
When a seismic isolation building is newly constructed, a two-stage seismic isolation device that connects an upper seismic isolation device and a lower seismic isolation device is installed as a seismic isolation device for isolating and supporting the seismic isolation building. By adjusting the natural period of the seismic isolation building at the time of new construction,
When an extension is added to the upper layer of the seismic isolation building, either the upper seismic isolation device or the lower seismic isolation device in the two-stage seismic isolation device is restrained so as to be inoperable. An extension method of a base-isolated building, characterized by re-adjusting the natural period of the whole seismic building. A method for extending a base-isolated building according to claim 1,
In the new construction, the upper and lower seismic isolation devices in the two-stage seismic isolation device are both composed of laminated rubber, and at the time of extension, either one of the two layers of laminated rubber is restrained by a restraining jig. How to extend the seismic isolation building. A method for extending a base-isolated building according to claim 1,
One of the upper and lower seismic isolation devices in the two-stage seismic isolation device is a laminated rubber and the other is a sliding bearing in the new construction, and the sliding bearing is restrained by a restraining jig in the extension. How to add a building.

Images