JP6932901B2 - How to extend a seismic isolated building - Google Patents

Description

The present invention relates to a method for extending a seismic isolated building.

Conventionally, a seismic isolated building that is horizontally seismically isolated with laminated rubber as a seismic isolation device is known. As a method for expanding the seismic isolated building, Patent Document 1 discloses the following method. First, as shown in FIG. 1A, a new seismic isolated building is separately installed on the ground G on the side of the existing seismic isolated building 1E that has been horizontally seismically isolated with the laminated rubber 31E, in an independent state that is not connected to the existing seismic isolated building 1E. Build 1N. Then, when this new seismic isolation building 1N is constructed, as shown in FIG. 1B, finally, this seismic isolation building 1N is connected and integrated with the existing seismic isolation building 1E via the connecting portion 1J to obtain one seismic isolation building. The seismic building 1 will be used, and the extension work of the seismic isolated building 1 will be completed.

Japanese Unexamined Patent Publication No. 10-292643

However, in the case of this method, in the state where the connection is not integrated as shown in FIG. 1A, the newly constructed seismic isolation building 1N under construction moves horizontally with the existing seismic isolation building 1E based on the laminated rubber 31N. Moves horizontally regardless. Then, the newly constructed seismic isolated building 1N under construction may collide with the existing seismic isolated building 1E due to an earthquake or wind. Therefore, the horizontal clearance CL1 between these seismic isolated buildings 1E and 1N is the maximum value of the horizontal movement amount of the new seismic isolated building 1N and the maximum value of the horizontal movement amount of the existing seismic isolated building 1E. It is necessary to set it larger than the added value, but if this is done, the new seismic isolated building 1N cannot be placed close to the existing seismic isolated building 1E, and as a result, there arises a problem that the land to be secured for the extension increases.

On the other hand, as a method that can avoid this problem, the following extension method can be considered. First, as shown in FIG. 2A, the existing seismic isolated building 1E has a lower foundation 3Ed under the laminated rubber 31E and an upper foundation 3Eu on the laminated rubber 31E. Then, each floor 1Ef of the existing seismic isolation building 1E is provided on the upper foundation 3Eu, whereby the laminated rubber 31E horizontally seismically isolates each floor 1Ef of the seismic isolation building 1E via the upper foundation 3Eu. I support it as much as possible.
Here, as shown in FIG. 2C, when a new seismic isolation building 1N is added to the side of the existing seismic isolation building 1E, first, as shown in FIG. 2A, the existing seismic isolation building 1E is used. The adjacent ground G is excavated to form a lower foundation 3Nd for the newly constructed seismic isolated building 1N, and a laminated rubber 31N is installed on the lower foundation 3Nd. Then, as shown in FIG. 2B, the upper foundation 3Nu is formed on the laminated rubber 31N, and the upper foundation 3Nu is connected and integrated with the upper foundation 3Eu of the existing seismic isolated building 1E via the connecting portion 3J. After that, as shown in FIGS. 2B and 2C, each floor 1Nf of the newly constructed seismic isolated building 1N is sequentially formed on the upper foundation 3Nu, and each floor 1Nf is used as the existing seismic isolated building 1E. It is connected via the connecting portion 1J.
Then, according to such an extension method, the newly constructed seismic isolated building 1N can link the above horizontal movement with the horizontal movement of the existing seismic isolated building 1E during its construction, and as a result, the above-mentioned It is possible to prevent the problem of increasing the land to be secured for the extension as described above.

However, during the construction of FIG. 2B, the seismic isolation cycle TP in which the existing seismic isolation building 1E and the new seismic isolation building 1N under construction are connected and integrated is the original seismic isolation building 1E. It may be smaller than the seismic isolation cycle TE, and there may be a problem that such a state in which the seismic isolation effect is reduced is forced on the existing seismic isolation building 1E until the end of the extension work. The details are as follows.

First, for the purpose of simplifying the explanation, it is assumed that a new seismic isolation building 1N having the same mass M as the existing seismic isolation building 1E is constructed as shown in FIG. However, it is assumed that the new seismic isolated building 1N has the same value as the existing seismic isolated building 1E. In this case, the original seismic isolation cycle TE of the existing seismic isolation building 1E is roughly represented by Equation 1 in FIG. 3A. On the other hand, the seismic isolation cycle TJ after the extension, that is, the seismic isolation cycle TJ in the state where the newly constructed seismic isolation building 1N and the existing seismic isolation building 1E are connected and integrated, is as shown in Equation 2 of FIG. 3B. As a result, the existing seismic isolation building 1E is seismically isolated with a seismic isolation cycle TJ having almost the same value as the original seismic isolation cycle TE even after the extension.

However, as shown in FIG. 2B, for example, when a new seismic isolated building 1N is constructed by about one-third, the mass of the seismic isolated building 1N is about one-third (= M / 3) of the completed state. However, on the other hand, the horizontal rigidity K of the laminated rubber 31N is the same size K as in the completed state. Then, this water-based rigidity K becomes larger than the mass (= M / 3) of the newly constructed seismic isolated building 1N constructed by about one-third, and as a result, the existing as shown in FIG. 2B The seismic isolation cycle TP in the state where the seismic isolation building 1E and the newly constructed seismic isolation building 1N under construction are connected and integrated becomes small as shown in Equation 3 in FIG. 3C. That is, as can be seen by comparing Equation 1 in FIG. 3A with Equation 3 in FIG. 3C, the seismic isolation cycle TP of the existing seismic isolation building 1E during construction of the new seismic isolation building 1N is the original seismic isolation. The period becomes smaller than the period TE, and as a result, such a state in which the seismic isolation effect is reduced is forced on the existing seismic isolation building 1E until the end of the extension work.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to be connected to the second seismic isolated building during construction of a second seismic isolated building such as a newly constructed seismic isolated building. The purpose is to prevent the seismic isolation effect of the first seismic isolation building such as the existing seismic isolation building from being reduced.

The invention shown in claim 1 for achieving such an object
This is an extension method of a seismic isolated building in which a second seismic isolated building connected to the first seismic isolated building is constructed on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building.
A first spherical sliding bearing member that supports the first upper structure so as to be horizontally seismically isolated is provided between the first lower structure and the first upper structure of the first seismic isolation building in the vertical direction. And
A second substructure forming step of forming the second substructure of the second seismic isolated building on the horizontal side of the first substructure, and
The second spherical sliding bearing member installation step of installing the second spherical sliding bearing member above the second lower structure, and the process of installing the second spherical sliding bearing member.
A lower portion forming step in which a lower portion of the second superstructure is formed above the second spherical sliding bearing member and the lower portion is supported by the second spherical sliding bearing member so as to be horizontally seismically isolated.
A lower part connecting step of connecting the lower part to the first upper structure, and
After the lower portion connecting step, have a, an upper portion forming step of forming an upper portion above the lower portion so as to be supported by the lower part,
The upper portion of the second superstructure has a plurality of layers and has a plurality of layers.
Wherein after forming all the levels in the upper part, the respective layers in the upper part, characterized in that it have a upper portion connecting step of sequentially linked to each layer corresponding in the first superstructure.
Further, it is a method of expanding a seismic isolated building in which a second seismic isolated building connected to the first seismic isolated building is constructed on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building. ,
A first spherical sliding bearing member that supports the first upper structure so as to be horizontally seismically isolated is provided between the first lower structure and the first upper structure of the first seismic isolation building in the vertical direction. And
A second substructure forming step of forming the second substructure of the second seismic isolated building on the horizontal side of the first substructure, and
The second spherical sliding bearing member installation step of installing the second spherical sliding bearing member above the second lower structure, and the process of installing the second spherical sliding bearing member.
A lower portion forming step in which a lower portion of the second superstructure is formed above the second spherical sliding bearing member and the lower portion is supported by the second spherical sliding bearing member so as to be horizontally seismically isolated.
A lower part connecting step of connecting the lower part to the first upper structure, and
After the lower portion connecting step, there is an upper portion forming step of forming an upper portion above the lower portion so as to be supported by the lower portion.
During the construction of the second superstructure, the seismic isolation cycle of the first superstructure connected to the second superstructure is made substantially constant.

According to the invention shown in claim 1, the first superstructure is seismically isolated and supported by the first spherical sliding bearing member, and the second superstructure is seismically isolated and supported by the second spherical sliding bearing member. ing. Therefore, each seismic isolation period of the first superstructure and the second superstructure is determined by the radius of curvature of each spherical surface of the first spherical sliding bearing member and the second spherical sliding bearing member, respectively. Therefore, regardless of the mass of the second superstructure under construction, the seismic isolation cycle in the state where the second superstructure is connected and integrated with the first superstructure can be made substantially constant. Since the seismic isolation cycle is substantially equal to the seismic isolation cycle of the seismic isolated building after the extension, it is set to a cycle in which an appropriate seismic isolation effect can be obtained. Therefore, it is possible to prevent the seismic isolation effect of the first seismic isolation building connected to the second seismic isolation building from being lowered during the construction of the second seismic isolation building.
Further, after forming all the layers in the upper portion of the second upper structure, each layer in the upper portion is sequentially connected to each corresponding layer in the first upper structure. Therefore, such connection work can be collectively performed for a short period of time, and as a result, the period in which noise or the like is inconvenienced to the first seismic isolated building due to the connection work can be shortened.
The invention shown in claim 2 is a seismic isolated building for constructing a second seismic isolated building connected to the first seismic isolated building on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building. It is a method of extension of
A first spherical sliding bearing member that supports the first upper structure so as to be horizontally seismically isolated is provided between the first lower structure and the first upper structure of the first seismic isolation building in the vertical direction. And
A second substructure forming step of forming the second substructure of the second seismic isolated building on the horizontal side of the first substructure, and
The second spherical sliding bearing member installation step of installing the second spherical sliding bearing member above the second lower structure, and the process of installing the second spherical sliding bearing member.
A lower portion forming step in which a lower portion of the second superstructure is formed above the second spherical sliding bearing member and the lower portion is supported by the second spherical sliding bearing member so as to be horizontally seismically isolated.
A lower part connecting step of connecting the lower part to the first upper structure, and
After the lower portion connecting step, have a, an upper portion forming step of forming an upper portion above the lower portion so as to be supported by the lower part,
During the construction of the second superstructure, the seismic isolation cycle of the first superstructure connected to the second superstructure is made substantially constant .

The invention shown in claim 3 is the method for expanding a seismic isolated building according to claim 2.
The upper portion of the second superstructure has a plurality of layers and has a plurality of layers.
It is characterized by having an upper partial connecting step of sequentially connecting each layer to each corresponding layer in the first upper structure while sequentially forming each layer in the upper part from a lower floor to an upper floor. ..

According to the third aspect of the present invention, each layer in the upper portion of the second upper structure is sequentially formed from the lower floor to the upper floor, and each layer is divided into the corresponding layers in the first upper structure. Connect in sequence. Therefore, even during the construction of the second superstructure, the second superstructure is integrated with the first superstructure of the first seismic isolated building, so that the first superstructure and the second superstructure can be used. , High load resistance can be achieved even during its construction.

The invention shown in claim 4 is the method for expanding a seismic isolated building according to any one of claims 1 to 3.
The first spherical sliding bearing member generates a frictional force as a damping force for dampening the horizontal vibration of the first superstructure.
The second spherical sliding bearing member is characterized in that a frictional force is generated as a damping force for attenuating the horizontal vibration of the second superstructure.

According to the invention of claim 4, the damping device for generating a damping force for dampening the horizontal vibration of the first superstructure and the damping device for generating a damping force for dampening the horizontal vibration of the second superstructure are provided. , It is not necessary to provide each separately. Therefore, the extension cost can be reduced.

The invention shown in claim 5 is the method for expanding a seismic isolated building according to claim 4.
The first spherical sliding bearing member includes an upper sliding plate having a concave spherical surface on the lower surface, a lower sliding plate provided below the upper sliding plate and having a concave spherical surface on the upper surface, and the upper sliding plate. The slider is slidably inserted between the spherical surface of the lower surface and the spherical surface of the lower sliding plate, and has convex spherical surfaces on the upper surface and the lower surface, respectively.
The second spherical sliding bearing member includes an upper sliding plate having a concave spherical surface on the lower surface, a lower sliding plate provided below the upper sliding plate and having a concave spherical surface on the upper surface, and the upper sliding plate. The slider is slidably inserted between the spherical surface of the lower surface and the spherical surface of the lower sliding plate, and has convex spherical surfaces on the upper surface and the lower surface, respectively.
The frictional force generated by the first spherical sliding bearing member is generated by sliding the spherical surface of the upper sliding plate of the first spherical sliding bearing member and the spherical surface of the lower sliding plate and the slider. ,
The frictional force generated by the second spherical sliding bearing member is generated by sliding the spherical surface of the upper sliding plate of the second spherical sliding bearing member and the spherical surface of the lower sliding plate and the slider. It is characterized by that.

According to the invention of claim 5, the frictional force can be adjusted by setting the coefficient of friction between the slider and the spherical surface. Therefore, the damping force can be adjusted relatively easily.

The invention shown in claim 6 is the method for expanding a seismic isolated building according to any one of claims 1 to 5.
The first spherical sliding support member has an upper sliding plate having a concave spherical surface having a first radius of curvature on the lower surface, and a concave shape having the same radius of curvature as the first radius of curvature on the upper surface provided below the upper sliding plate. The lower sliding plate provided with the spherical surface and the spherical surface of the upper sliding plate and the spherical surface of the lower sliding plate are slidably inserted, and the first radius of curvature is formed on the upper surface and the lower surface, respectively. With a slider having a convex spherical surface with the same radius of curvature,
The second spherical sliding support member has an upper sliding plate having a concave spherical surface having a second radius of curvature on the lower surface, and a concave shape having the same radius of curvature as the second radius of curvature on the upper surface provided below the upper sliding plate. The lower sliding plate provided with the spherical surface and the spherical surface of the upper sliding plate and the spherical surface of the lower sliding plate are slidably inserted, and the second radius of curvature is formed on the upper surface and the lower surface, respectively. With a slider having a convex spherical surface with the same radius of curvature,
The first radius of curvature and the second radius of curvature are characterized by having the same value.

According to the invention shown in claim 6, the first radius of curvature of each spherical surface of the first spherical sliding bearing member and the second radius of curvature of each spherical surface of the second spherical surface sliding bearing member have the same value. Therefore, the seismic isolation cycle after the second seismic isolation building is connected and integrated with the first seismic isolation building can be set to the same value as the original seismic isolation cycle of the first seismic isolation building before the connection. As a result, the seismic isolation effect equivalent to the original seismic isolation effect of the first seismic isolation building can be obtained during and after the extension.

According to the present invention, during the construction of a second seismic isolation building such as a newly constructed seismic isolation building, the seismic isolation effect of the first seismic isolation building such as an existing seismic isolation building connected to the second seismic isolation building is exhibited. It is possible to suppress the decrease.

1A and 1B are explanatory views of an extension method of the seismic isolated building 1 disclosed in Patent Document 1. 2A to 2C are explanatory views of another example of the extension method of the seismic isolated building 1. FIG. 3A is a formula 1 showing a seismic isolation cycle TE, FIG. 3B is a formula 2 showing a seismic isolation cycle TJ, and FIG. 3C is a formula 3 showing a seismic isolation cycle TP. 4A and 4B are explanatory views of the construction procedure of the extension method of the seismic isolated building 1 of the present embodiment. 5A and 5B are explanatory views of the construction procedure as well. 6A and 6B are schematic vertical sectional views of the spherical sliding bearing member 41E. FIG. 7A is a formula 4 showing a seismic isolation cycle TE, FIG. 7B is a formula 5 showing a seismic isolation cycle TN, and FIG. 7C is a formula 6 showing a seismic isolation cycle TP. 8A and 8B are explanatory views of another example of the connection timing of each floor 1Ef of the existing seismic isolated building 1E and each floor 1Nf of the new seismic isolated building 1N. 9A and 9B show an example in which the vertical positions of the lower foundations 3Ed and 3Nd and the vertical positions of the upper foundations 3Eu and 3Nu are deviated between the existing seismic isolation building 1E and the new seismic isolation building 1N, respectively. It is explanatory drawing. It is explanatory drawing of the example in which the number of the above-ground floor 1Ef of the existing seismic isolation building 1E and the number of the above-ground floor 1Nf of the newly built seismic isolation building 1N are different from each other.

=== This embodiment ===
4A to 5B are explanatory views of the construction procedure of the extension method of the seismic isolated building 1 of the present embodiment.
As shown in FIG. 4A, at this point in time, the existing seismic isolated building 1E (corresponding to the first seismic isolated building and hereinafter also referred to as the existing seismic isolated building 1E) has already been completed. The existing seismic isolation building 1E has a lower foundation 3Ed (corresponding to the first lower structure) such as a concrete slab provided on the ground G and a spherical surface as a seismic isolation device 41E provided on the lower foundation 3Ed. A sliding bearing member 41E (corresponding to the first spherical sliding bearing member), an upper foundation 3Eu such as a concrete slab provided on the spherical sliding bearing member 41E, and each layer 1Ef provided on the upper foundation 3Eu. Have. The upper foundation 3Eu and each layer 1Ef correspond to the "first superstructure" according to the claim. Further, each layer 1Ef is composed of a structural skeleton such as a floor slab, a column, a beam, and a wall. Then, by the above-mentioned spherical sliding bearing member 41E, each layer 1Ef located above the upper foundation 3Eu including the upper foundation 3Eu is supported so as to be horizontally seismically isolated.

Here, as shown in the schematic vertical sectional view of FIG. 6A, the spherical sliding bearing member 41E includes an upper sliding plate 42Eu, a lower sliding plate 42Ed arranged below the upper sliding plate 42Eu, and an upper sliding plate 42Eu. It has a slider 43E inserted between the lower sliding plate 42Ed and the lower sliding plate 42Ed in the vertical direction. The upper surface 42Eu of the upper sliding plate 42Eu is fixed to the lower surface 3Eud of the upper foundation 3Eu located above the upper sliding plate 42Eu by bolting or the like so as not to be relatively movable, and the lower surface 42Edd of the lower sliding plate 42Ed is below the lower surface 42Eud. It is fixed to the upper surface 3Edu of the lower foundation 3Ed located at the position by bolting or the like so as not to be relatively movable. Further, the lower surface 42Eud of the upper sliding plate 42Eu and the upper surface 42Edu of the lower sliding plate 42Ed are formed with spherical surfaces 42Euk and 42Edk in a concave shape, respectively, and the upper surface 43Eu and the lower surface 43Ed of the slider 43E are convex, respectively. It is said that the spherical surfaces are 43Eu and 43Ed. Further, the radius of curvature of the concave spherical surfaces 42Euk and 42Edk and the radius of curvature of the convex spherical surfaces 43Eu and 43Ed are aligned with a predetermined value Rc. The convex spherical surface 43Eu, which is the upper surface 43Eu of the slider 43E, is in contact with the concave spherical surface 42Euk of the lower surface 42Eu of the upper sliding plate 42Eu and can slide with a predetermined friction coefficient, and the lower surface 43Ed of the slider 43E is convex. The shaped spherical surface 43Ed is in contact with the concave spherical surface 42Edk of the upper surface 42Edu of the lower sliding plate 42Ed and can slide with a predetermined friction coefficient.

Therefore, as shown in FIG. 6B, when the upper foundation 3Eu and the lower foundation 3Ed are displaced relative to each other in the horizontal direction, the slider 43E slides on the spherical surface 42Euk of the upper sliding plate 42Eu and the spherical surface 42Ed of the lower sliding plate 42Ed, respectively. As a result, each layer 1Ef located above the upper foundation 3Eu including the upper foundation 3Eu is horizontally seismically isolated.

The seismic isolation period TE (seconds) at that time is roughly expressed as in Equation 4 of FIG. 7A using the predetermined value Rc of the radius of curvature described above based on the same principle as the period of the pendulum. Therefore, the seismic isolation period TE largely does not depend on the mass M of the upper foundation 3Eu and each layer 1Ef located above the spherical sliding bearing member 41E. In this respect, it is significantly different from the above-mentioned laminated rubber 31E, which depends on the ratio of the mass M and its own horizontal rigidity K as shown in FIG. 3A. It should be noted that this is described later, that is, the seismic isolation cycle TP in the state where the new seismic isolation building 1N under construction and the existing seismic isolation building 1E are connected is the original seismic isolation building 1E before the connection. It is related to the action and effect that it can be made almost unchanged from the seismic isolation cycle TE.

Next, as shown in FIGS. 4A to 5B, a seismic isolated building 1N is separately added to the side of the existing seismic isolated building 1E by the following procedure. In the following, the seismic isolated building 1N newly constructed for extension is also referred to as a new seismic isolated building 1N (corresponding to the second seismic isolated building).

First, as shown in FIG. 4A, a lower foundation 3Nd (corresponding to the second substructure) such as a concrete slab for the new seismic isolation building 1N is provided on the ground G on the side of the existing seismic isolation building 1E (second). Corresponds to the substructure formation process). The lower foundation 3Nd may or may not be connected to the lower foundation 3Ed of the existing seismic isolated building 1E as shown in FIG. 4A. Further, the lower foundation 3Nd may be a solid foundation without piles as shown in FIG. 4A, or a plurality of piles (not shown) extending downward from the lower foundation 3Nd, which is the above-mentioned existing seismic isolation. The same applies to the lower foundation 3Ed of the seismic building 1E.

Then, as shown in FIG. 4B, a spherical sliding bearing member 41N (corresponding to the second spherical sliding bearing member) similar to that used in the existing seismic isolated building 1E described above is installed on the upper surface of the lower foundation 3Nd. Then, the lower sliding plate 42Nd of the spherical sliding bearing member 41N is fixed to the upper surface of the lower foundation 3Nd by bolting or the like so as not to be relatively movable (corresponding to the second spherical sliding bearing member installation step). Incidentally, the radius of curvature of the concave spherical surface 42Nuk of the lower surface 42Nud of the upper surface 42Nu of the spherical sliding support member 41N, the radius of curvature of the concave spherical surface 42Ndu of the upper surface 42Ndu of the lower surface plate 42Nd, and the curvature radius of the concave spherical surface 42Ndk of the lower surface 42Nd, and the upper surface 43Nu of the slider 43N. The radius of curvature of each of the convex spherical surfaces 43Nu and 43Nd of the lower surface 43Nd is the same as the radius of curvature of each of the spherical surfaces 42Euk, 42Edk, 43Eu, 43Ed of the spherical surface sliding support member 41E used for the existing seismic isolation building 1E described above, respectively. It is set to the above-mentioned predetermined value Rc. As a result, the seismic isolation building 1 after the extension in FIG. 5B, that is, the seismic isolation cycle of the seismic isolation building 1 in which the existing seismic isolation building 1E and the new seismic isolation building 1N are connected and integrated via the connecting portion 1J. The TJ is roughly represented by the formula 6 in FIG. 7C, and as a result, the seismic isolation cycle TJ is maintained at approximately the same value as the original seismic isolation cycle TE of the existing seismic isolation building 1E, which is roughly represented by the formula 4 in FIG. 7A. Will be done. Therefore, it is suppressed that the seismic isolation effect of the existing seismic isolation building 1E changes significantly before and after the extension, and as a result, the residents of the existing seismic isolation building 1E can live without a great sense of discomfort.

Next, as shown in FIG. 4B, an upper foundation 3Nu (corresponding to the lower part in the second upper structure) such as a concrete slab is installed on the spherical sliding bearing member 41N, and the spherical sliding is performed on the lower surface of the upper foundation 3Nu. The upper surface of the upper sliding plate 42Nu of the bearing member 41N is fixed by bolting or the like so as not to be relatively movable (corresponding to the lower partial forming step).

Then, as shown in FIG. 4B, the upper foundation 3Nu is connected to the upper foundation 3Eu of the existing seismic isolated building 1E located on the side thereof via the connecting portion 3J and integrated (in the lower partial connecting step). Equivalent). As a result, the upper foundation 3Nu for the new seismic isolated building 1N becomes a state in which it can move in the horizontal direction together with the upper foundation 3Eu of the existing seismic isolated building 1E. The seismic isolation cycle TN of the newly constructed seismic isolation building 1N under construction is roughly represented by Equation 5 in FIG. 7B. That is, the seismic isolation period TN is largely independent of the mass of the newly constructed seismic isolation building 1N under construction, and is determined based on the radius of curvature of the above spherical surfaces 42Nuk, 42Ndk, 43Nu, 43Nd, and the radius of curvature is determined. It is the same value as the above-mentioned predetermined value Rc which is the radius of curvature of the spherical surfaces 42Euk, 42Edk, 43Eu, 43Ed of the spherical surface sliding support member 41E of the existing seismic isolated building 1E. Therefore, the seismic isolation cycle TP after the existing seismic isolation building 1E and the new seismic isolation building 1N under construction are integrated is roughly represented by Equation 6 in FIG. 7C, and the seismic isolation cycle TP is generally described above. It is the same value as the seismic isolation cycle TE. As a result, even during the construction of the new seismic isolation building 1N, the seismic isolation cycle TP of the existing seismic isolation building 1E connected to the new seismic isolation building 1N is changed to the original seismic isolation cycle TE of the existing seismic isolation building 1E. It can be generally maintained in FIG. 7A), and as a result, a problem that can occur when the laminated rubbers 31E and 31N of FIG. 2B are used, that is, the seismic isolation cycle TP during construction of the new seismic isolation building 1N becomes small and seismic isolation occurs. It is possible to avoid the problem that the effect is reduced.

Then, as shown in FIG. 5A, each layer 1Nf (corresponding to the upper part in the second upper structure) is sequentially formed from the lower floor to the upper floor above the upper foundation 3Nu so as to be supported by the upper foundation 3Nu. (Corresponds to the upper part forming step). Each floor 1Nf is composed of a structural skeleton such as a floor slab, a column, a beam, and a wall, respectively, like the floor 1Ef of the existing seismic isolated building 1E described above. Then, when forming each of these floors 1Nf, each floor 1Nf is sequentially connected to each corresponding floor 1Ef in the existing seismic isolated building 1E via the connecting portion 1Jf (corresponding to the upper partial connecting step), and as a result, Finally, when the uppermost floor 1Nf is formed as shown in FIG. 5B and the floor 1Nf is connected to the corresponding floor 1Ef of the existing seismic isolated building 1E, the extension work of the seismic isolated building 1 is completed. ..

In this way, each floor 1Nf of the new seismic isolated building 1N is sequentially formed from the lower floor to the upper floor, and each floor 1Nf is sequentially formed on each floor 1Ef corresponding to the existing seismic isolated building 1E as shown in FIG. 5A. By connecting, each floor 1Nf is sequentially integrated with each floor 1Ef of the existing seismic isolation building 1E even during the construction of the new seismic isolation building 1N. Therefore, each floor 1Ef of the existing seismic isolated building 1E and each floor 1Nf of the new seismic isolated building 1N can exhibit high load bearing capacity even during the construction.

However, it is not limited to this. For example, as shown in FIG. 8A, after forming all the floors 1Nf of the new seismic isolated building 1N, the floors 1Nf are sequentially connected to the corresponding floors 1Ef in the existing seismic isolation building 1E via the connecting portion 1Jf. You may. In this case, since the connection work can be collectively performed for a short period of time, it is possible to shorten the period in which the resident of the existing seismic isolated building 1E is inconvenienced by noise or the like due to the connection work.

By the way, after the extension as shown in FIG. 8B, the spherical sliding bearing members 41E and 41N of the existing seismic isolation building 1E and the new seismic isolation building 1N generate a frictional force in a substantially horizontal direction during horizontal seismic isolation. That is, at the time of the horizontal seismic isolation, the sliders 43E and 43N of the spherical sliding support members 41E and 41N have the spherical surfaces 43Eu and 43Nu of the upper sliding plates 42Eu and 42Nu and the spherical surfaces 42Edk of the lower sliding plates 42Ed and 42Nd with the above-mentioned friction coefficient. , 42Ndk is slid, and at that time, a frictional force in a substantially horizontal direction is generated. obtain. Therefore, it is not necessary to provide a damping device such as an oil damper between the upper foundations 3Eu and 3Nu and the lower foundations 3Ed and 3Nd for damping the horizontal vibration, whereby the extension cost can be reduced. However, it is not limited to this. That is, if the damping force is insufficient, a separate damping device may be provided.

Strictly speaking, equations 4 to 6 of the seismic isolation periods TE, TN, and TP in FIGS. 7A to 7C are for cases where the above frictional force is ignored, but in reality, as described above. Friction force is generated in. Therefore, the seismic isolation cycle may fluctuate depending on the magnitude of the frictional force.
However, at this point, since the magnitude of this frictional force is a value obtained by multiplying the vertical load acting on the spherical sliding bearing members 41E and 41N by the above friction coefficient, the magnitude of the frictional force is the upper foundation. It changes in conjunction with the total mass of 3Eu, 3Nu and each layer 1Ef, 1Nf. For example, as the total mass increases as the formation of each layer 1Nf provided above the upper foundation 3Nu progresses, the frictional force also increases accordingly, and the ratio of the total mass to the frictional force is substantially constant. And this is almost equivalent to the term in the route on the right side in the equation 1 of FIG. 3A, that is, the value of M / K is substantially constant. Therefore, the fluctuation that the frictional force can give to the seismic isolation cycles TE, TN, and TP becomes very small, and as a result, even when the frictional force is taken into consideration, the seismic isolation effect of the existing seismic isolation building 1E is obtained. The same level of seismic isolation effect can be maintained for the entire period during the construction of the new seismic isolation building 1N.

=== Other embodiments ===
Although the embodiments of the present invention have been described above, the above-described embodiments are for facilitating the understanding of the present invention, and are not for limiting the interpretation of the present invention. Further, it is needless to say that the present invention can be changed or improved without departing from the spirit thereof, and the present invention includes an equivalent thereof. For example, the following modifications are possible.

In the above-described embodiment, as shown in FIG. 5B, the lower foundation 3Ed of the existing seismic isolated building 1E and the lower foundation 3Nd of the new seismic isolated building 1N are aligned in the vertical direction with each other. The upper foundation 3Eu of the seismic building 1E and the upper foundation 3Nu of the new seismic isolated building 1N are aligned in the vertical direction with each other, but the position is not limited to this. For example, as shown in FIGS. 9A and 9B, the vertical positions of the lower foundations 3Ed and 3Nd are deviated between the existing seismic isolated building 1E and the newly constructed seismic isolated building 1N, and the upper and lower foundations 3Eu and 3Nu are vertically positioned. The position of the direction may be different between the existing seismic isolated building 1E and the new seismic isolated building 1N. In the case of FIG. 9A, the upper foundation 3Nu of the new seismic isolated building 1N is connected to the floor of the existing seismic isolated building 1E on the first basement floor 1Ef or the first floor above ground via the connecting portion 3J. Although it has been done, this may be done. Further, in the case of FIG. 9B, since the upper foundation 3Nu of the new seismic isolated building 1N is connected to the upper foundation 3Eu of the existing seismic isolated building 1E, the vertical cross-sectional view having a stepped portion as the connecting portion 3J. A crank-shaped member is used in. Further, in some cases, as shown in FIG. 10, the number of the above-ground floors 1Ef of the existing seismic isolated building 1E and the number of the above-ground floors 1Nf of the newly built seismic isolated building 1N may be different from each other. In the example of FIG. 10, the number of floors 1Ef on the ground of the existing seismic isolated building 1E is one more, but it is not limited to this. That is, the number of floors 1Nf above the ground of the new seismic isolated building 1N may be larger.

1 Seismic isolation building,
1E Existing seismic isolation building (1st seismic isolation building), 1Ef floor,
1Jf connecting part, 1J connecting part,
1N New Seismic Isolation Building (2nd Seismic Isolation Building),
1Nf hierarchy (upper part in the second superstructure),
3Eu upper foundation, 3Eud lower surface,
3Ed lower foundation (first substructure), 3Edu upper surface,
3 Nu upper foundation (lower part in the second superstructure),
3Nd lower foundation (second substructure),
3J connection part,
31E laminated rubber, 31N laminated rubber,
41E spherical sliding bearing member (first spherical sliding bearing member),
41N spherical sliding bearing member (second spherical sliding bearing member),
42Eu upper sliding plate, 42Eud lower surface, 42Euk spherical surface,
42Euu top surface,
42Ed lower sliding plate, 42Ed lower surface, 42Edk spherical surface,
42Edu top surface,
42Nu upper sliding plate, 42Nud lower surface, 42Nuk spherical surface,
42Nd lower sliding plate, 42Ndu upper surface, 42Ndk spherical surface,
43E slider, 43Eu upper surface (spherical surface), 43Ed lower surface (spherical surface),
43N slider, 43Nu upper surface (spherical surface), 43Nd lower surface (spherical surface),
G ground,

Claims (6)

This is an extension method of a seismic isolated building in which a second seismic isolated building connected to the first seismic isolated building is constructed on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building.
A first spherical sliding bearing member that supports the first upper structure so as to be horizontally seismically isolated is provided between the first lower structure and the first upper structure of the first seismic isolation building in the vertical direction. And
A second substructure forming step of forming the second substructure of the second seismic isolated building on the horizontal side of the first substructure, and
The second spherical sliding bearing member installation step of installing the second spherical sliding bearing member above the second lower structure, and the process of installing the second spherical sliding bearing member.
A lower portion forming step in which a lower portion of the second superstructure is formed above the second spherical sliding bearing member and the lower portion is supported by the second spherical sliding bearing member so as to be horizontally seismically isolated.
A lower part connecting step of connecting the lower part to the first upper structure, and
After the lower portion connecting step, have a, an upper portion forming step of forming an upper portion above the lower portion so as to be supported by the lower part,
The upper portion of the second superstructure has a plurality of layers and has a plurality of layers.
After forming all the levels in the upper part, the seismic isolation building, characterized in that the perforated upper portion connecting step of sequentially connecting each layer in the upper portion, in each layer corresponding at said first upper structure How to extend. This is an extension method of a seismic isolated building in which a second seismic isolated building connected to the first seismic isolated building is constructed on the horizontal side of the first seismic isolated building after the completion of the first seismic isolated building.
A first spherical sliding bearing member that supports the first upper structure so as to be horizontally seismically isolated is provided between the first lower structure and the first upper structure of the first seismic isolation building in the vertical direction. And
A second substructure forming step of forming the second substructure of the second seismic isolated building on the horizontal side of the first substructure, and
The second spherical sliding bearing member installation step of installing the second spherical sliding bearing member above the second lower structure, and the process of installing the second spherical sliding bearing member.
A lower portion forming step in which a lower portion of the second superstructure is formed above the second spherical sliding bearing member and the lower portion is supported by the second spherical sliding bearing member so as to be horizontally seismically isolated.
A lower part connecting step of connecting the lower part to the first upper structure, and
After the lower portion connecting step, there is an upper portion forming step of forming an upper portion above the lower portion so as to be supported by the lower portion.
A method for expanding a seismic isolated building, which comprises making the seismic isolation cycle of the first superstructure connected to the second superstructure substantially constant during the construction of the second superstructure. The method for expanding a seismic isolated building according to claim 2.
The upper portion of the second superstructure has a plurality of layers and has a plurality of layers.
It is characterized by having an upper partial connecting step of sequentially connecting each layer to each corresponding layer in the first upper structure while sequentially forming each layer in the upper part from a lower floor to an upper floor. How to extend a seismic isolated building. The method for expanding a seismic isolated building according to any one of claims 1 to 3.
The first spherical sliding bearing member generates a frictional force as a damping force for dampening the horizontal vibration of the first superstructure.
A method for expanding a seismic isolated building, wherein the second spherical sliding bearing member generates a frictional force as a damping force for dampening the horizontal vibration of the second superstructure. The method for expanding a seismic isolated building according to claim 4.
The first spherical sliding bearing member includes an upper sliding plate having a concave spherical surface on the lower surface, a lower sliding plate provided below the upper sliding plate and having a concave spherical surface on the upper surface, and the upper sliding plate. The slider is slidably inserted between the spherical surface of the lower surface and the spherical surface of the lower sliding plate, and has convex spherical surfaces on the upper surface and the lower surface, respectively.
The second spherical sliding bearing member includes an upper sliding plate having a concave spherical surface on the lower surface, a lower sliding plate provided below the upper sliding plate and having a concave spherical surface on the upper surface, and the upper sliding plate. The slider is slidably inserted between the spherical surface of the lower surface and the spherical surface of the lower sliding plate, and has convex spherical surfaces on the upper surface and the lower surface, respectively.
The frictional force generated by the first spherical sliding bearing member is caused by sliding the spherical surface of the upper sliding plate of the first spherical sliding bearing member and the spherical surface of the lower sliding plate with the slider.
The frictional force generated by the second spherical sliding bearing member is generated by sliding the spherical surface of the upper sliding plate of the second spherical sliding bearing member and the spherical surface of the lower sliding plate and the slider. A method of expanding a seismic isolated building, which is characterized by this. The method for expanding a seismic isolated building according to any one of claims 1 to 5.
The first spherical sliding support member has an upper sliding plate having a concave spherical surface having a first radius of curvature on the lower surface, and a concave shape having the same radius of curvature as the first radius of curvature on the upper surface provided below the upper sliding plate. The lower sliding plate provided with the spherical surface and the spherical surface of the upper sliding plate and the spherical surface of the lower sliding plate are slidably inserted, and the first radius of curvature is formed on the upper surface and the lower surface, respectively. With a slider having a convex spherical surface with the same radius of curvature,
The second spherical sliding support member has an upper sliding plate having a concave spherical surface having a second radius of curvature on the lower surface, and a concave shape having the same radius of curvature as the second radius of curvature on the upper surface provided below the upper sliding plate. The lower sliding plate provided with the spherical surface and the spherical surface of the upper sliding plate and the spherical surface of the lower sliding plate are slidably inserted, and the second radius of curvature is formed on the upper surface and the lower surface, respectively. With a slider having a convex spherical surface with the same radius of curvature,
A method for expanding a seismic isolated building, wherein the first radius of curvature and the second radius of curvature have the same value.

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