JP2012237111A - Construction method for base-isolated building, and base-isolated building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the flexibility in design of ground stories by relaxing restrictions of building specifications of the ground story resulting from a seismic isolator, in a construction for case-isolated building.SOLUTION: There is provided a method of constructing the base-isolated building using the underground skeleton of an existent building having underground stories. The method includes: a ground skeleton demolition process of demolishing the ground skeleton of the existent building; an underground skeleton alteration process of altering the underground skeleton by demolishing a part of an upper part of the underground skeleton while leaving and using at least one underground story of the underground skeleton of the existent building; a seismic isolator installation process of supporting the seismic isolator by the underground skeleton while arranging the seismic isolator in an underground space formed by demolishing the part of the upper part; and a ground-side skeleton forming process of forming a ground-side skeleton having at least the ground stories and supported by the underground skeleton in a base-isolated state through the seismic isolator.

Description

  The present invention relates to a method for constructing a base-isolated building using an underground building of an existing building having an underground floor, and a base-isolated building.

When a seismic isolation building is newly constructed at a place where an existing building is erected, normally, both the ground frame and underground frame of the existing building are dismantled, and then a new underground frame and ground frame are constructed. However, in this case, a lot of industrial waste such as demolition waste is generated along with the dismantling of the ground and underground structures, and the treatment thereof may become a problem. In addition, with the dismantling of the underground structure, the vibration and noise may propagate to the surrounding area and cause problems.
In this regard, Patent Document 1 discloses that a base-isolated building is constructed using an underground building of an existing building. That is, first, the ground structure of the existing building is dismantled, but the underground structure is left without dismantling. Then, a column is extended upward from the underground frame, and a seismic isolation device is arranged on the column. Thereafter, a ground frame is newly constructed above the seismic isolation device and supported by the seismic isolation device.

And according to such a construction method, it is possible to reduce the demolition rattle of the underground structure, and to solve the problems of vibration and noise associated with the demolition work of the underground structure.
Furthermore, the underground floor of the basement of the existing building can be used as the basement floor of a seismic isolation building to be newly constructed, and the construction cost of the base isolation building can be reduced.

JP 2002-174051 A

  However, in this construction method, the seismic isolation device is provided on the ground. In other words, a seismic isolation layer equipped with a seismic isolation device is arranged on one of the ground floors of the building (for example, the first floor above the ground), but then one of the ground floors becomes unusable for commercial use. For example, a dead space will be imposed, and there will be significant restrictions on the architectural specifications of the ground floor that should be effectively used as a commercial space.

  The present invention has been made in view of the above-described conventional problems, and an object thereof is related to a base-isolated building that is constructed at a low construction cost by using an underground floor of an underground building of an existing building. The purpose is to alleviate the restrictions on the ground floor architectural specifications caused by the seismic isolation device and increase the degree of freedom in designing the ground floor.

In order to achieve this object, the invention shown in claim 1
A method of constructing a base-isolated building using an underground building of an existing building having a basement floor,
A ground frame dismantling process for demolishing the ground frame of the existing building;
An underground structure remodeling step of remodeling the underground structure by dismantling a part of the upper part of the underground structure while using at least one underground floor of the underground structure of the existing building.
While installing the seismic isolation device in the underground space formed by dismantling part of the upper part, the seismic isolation device installation step for supporting the seismic isolation device on the underground frame,
A ground-side housing forming step of forming a ground-side housing that has at least a ground floor and is seismically isolated and supported by the underground housing via the seismic isolation device.

According to the first aspect of the present invention, the seismic isolation device is arranged in an underground space formed by remodeling an underground building of an existing building, and does not partly appear on the ground. Therefore, the restriction of the ground floor building specifications due to the seismic isolation device can be relaxed, and the design freedom of the ground floor can be increased.
In addition, since at least one of the underground floors of the underground building of the existing building is left behind, the construction cost of the seismic isolation building can be reduced accordingly.

Invention of Claim 2 is the construction method of the seismic isolation building of Claim 1,
The basement of the existing building has a plurality of basements,
The seismic isolation device is installed in a portion corresponding to the first basement floor of the existing building,
Of the underground structure of the existing building, at least a portion below the floor portion of the second basement is left behind.
According to the second aspect of the present invention, at least a portion below the floor part of the second basement floor among the underground structures of the existing building is left behind. That is, in the underground building of the existing building, except for a predetermined part of the first basement where the seismic isolation device is to be arranged, it is generally left behind. Therefore, the scope of dismantling of the underground building of the existing building can be generally kept within the minimum necessary range for installing the seismic isolation device in the underground space, and as a result, the amount of dismantling work can be greatly reduced.

  In addition, as described above, the scope of dismantling of the underground building of the existing building can be generally kept within the minimum necessary range, so that the size of the portion left in the underground building of the existing building can be secured large. . As a result, it is possible to effectively counter the buoyancy imparted from the groundwater or the like during the construction work of the base-isolated building with the dead weight of the part of the underground skeleton that is left behind, and as a result, the anti-lifting measures can be relaxed.

  Furthermore, the floor of the second floor of the existing building is left behind. Therefore, during the construction work of the base-isolated building, the floor of the second basement can be effectively functioned as a beam when the outer wall of the basement of the existing building functions as a retaining wall. Cut beam support work can be reduced.

Invention of Claim 3 is the construction method of the seismic isolation building of Claim 2,
Furthermore, the floor portion of the first basement floor of the existing building is left behind.
According to the third aspect of the present invention, not only the portion below the floor portion of the second basement floor but also the floor portion of the first basement floor is used in the basement of the existing building. Therefore, it is possible to limit the dismantling target range of the underground building of the existing building to a narrower range, and as a result, it is possible to further reduce the amount of dismantling work.

In addition, as described above, since the scope of dismantling of the underground building of the existing building can be narrowed, the size of the remaining portion of the underground building of the existing building can be further ensured. As a result, it is possible to more effectively counter the buoyancy imparted from the groundwater or the like during the construction work of the base-isolated building with the dead weight of the remaining underground frame.
Furthermore, the floor part of the first basement floor that remains is a beam that supports the outer wall part of the underground structure of the existing building that will be the retaining wall during the construction work of the base-isolated building, similar to the floor part of the basement second floor described above. It can function effectively, and as a result, the beam support can be further reduced.

Invention of Claim 4 is the construction method of the seismic isolation building in any one of Claim 1 thru | or 3, Comprising:
The seismic isolation device is arranged on the floor of the underground structure after remodeling in the underground structure remodeling step.
According to the fourth aspect of the present invention, the seismic isolation device is installed on the floor. Therefore, the worker can use the floor portion as a work passage at the time of maintenance inspection after the seismic isolation building is completed, so that the installation position of the seismic isolation device can be reached easily and safely. Further, since the floor can be used as a work scaffold during inspection work, the work can be performed safely and reliably.

Invention of Claim 5 is the construction method of the seismic isolation building of Claim 4, Comprising:
The seismic isolation device is installed directly above a beam portion of the underground frame or just above a column beam joint.
According to the fifth aspect of the present invention, the underground frame can receive the horizontal force input from the seismic isolation device at the column beam portion. Therefore, the horizontal force is borne by the column portion and the beam portion of the underground frame, and as a result, the column portion can be effectively prevented from being damaged through significant suppression of horizontal deformation of the column portion.

The invention shown in claim 6 is a base-isolated building constructed using an underground building of an existing building having an underground floor,
A basement that has been modified by dismantling a part of the upper part of the basement while leaving at least one basement of the basement of the existing building,
While being arranged in an underground space formed by disassembling a part of the upper part, a seismic isolation device supported by the underground frame,
A ground side housing having a ground floor and supported by the seismic isolation device.
According to the sixth aspect of the present invention, the seismic isolation device is arranged in an underground space formed by remodeling an underground building of an existing building, and does not partly appear on the ground. Therefore, the restriction of the ground floor building specifications due to the seismic isolation device can be relaxed, and the design freedom of the ground floor can be increased.
In addition, since at least one of the underground floors of the underground building of the existing building is left behind, the construction cost of the seismic isolation building can be reduced accordingly.

  According to the present invention, it relates to a base-isolated building that is constructed by using a basement floor of an existing building's basement to suppress construction costs, and relaxes the restrictions on the building specifications of the ground floor caused by the base isolation device, The design freedom of the ground floor can be increased.

It is explanatory drawing of the construction method of the seismic isolation building 11 of 1st Embodiment. FIG. FIG. FIG. FIG. FIG. It is explanatory drawing of the construction method of the seismic isolation building 11a of 2nd Embodiment. FIG. FIG. FIG. FIG. FIG. It is explanatory drawing of the construction method of the seismic isolation building 11b of 3rd Embodiment. FIG. FIG. FIG. FIG.

=== First Embodiment ===
1A to 1F are explanatory diagrams of a construction method of the seismic isolation building 11 according to the first embodiment. Each figure is a schematic diagram in a longitudinal sectional view, but hatching that should originally be shown in a sectional portion is omitted in order to prevent complication of the figure.
In this construction method, the base-isolated building 11 of FIG. 1F is constructed by using the underground frame 1d of the existing building 1 of FIG. 1A. That is, by using the underground housing 1d of the existing building 1 having the ground floor and the underground floor as shown in FIG. 1A, the ground side housing 11u having the ground floor as shown in FIG. 1F is finally exempted from the underground housing 11d. Build a seismically isolated building 11 supported by earthquakes.

  As shown in FIG. 1A, the existing building 1 has an underground skeleton 1d embedded in the ground G and an above-ground skeleton 1u provided above the underground skeleton 1d. The ground frame 1u has outer wall portions 3, 3,... That form the outer shape of the ground frame 1u. In the space partitioned inwardly by the outer wall portions 3, 3,..., A plurality of floor portions 5, column portions 7, and beam portions 9 are provided, respectively. Floors 1F to 6F are formed and used as living rooms. Similarly, the underground skeleton 1d also has outer wall portions 3, 3... That form the outer shape of the underground skeleton 1d. In the inner space partitioned by the outer wall portions 3, 3,..., A plurality of floor portions 5, pillar portions 7, and beam portions 9 are provided, respectively. B1F to B5F are formed and used as a living room or an underground parking lot. Note that an underground pit BP is provided below the lowermost floor B5F of the underground floor at the lower part of the underground housing 1d. The underground pit BP has, for example, a plurality of horizontal hole spaces St, and is used as a space for infrastructure facilities such as a water supply / drain pipe, an electric wire, and a gas pipe.

  In the construction method of the seismic isolation building 11, as shown in FIG. 1B, first, the ground frame 1u in the existing building 1 is dismantled (corresponding to a ground frame dismantling process). Here, the ground chassis 1u refers to a chassis located on the ground. In this example, the upper surface of the floor portion 5 of the first floor 1F is located at the same level as or slightly higher than the level GL of the surrounding ground. That is, the floor portion 5 and the beam portion 9 that is connected to the floor portion 5 and protrudes downward may straddle the boundary between the ground and the underground, but basically the floor of the first floor 1F above the ground. Most parts of the part 5 and the beam part 9 are located underground. Therefore, here, the floor 5 and the beam 9 are handled as belonging to the underground skeleton 1d. As a result, as described above, from the dismantling target range at this time, both the floor portion 5 of the ground floor 1F and the beam portion 9 integrally connected to the floor portion 5 and projecting downward are Excluded.

  However, this belonging relationship is not limited to this. For example, for the reason that the floor portion 5 and the beam portion 9 form the ground first floor 1F, the floor portion 5 and the beam portion 9 may be treated as belonging to the ground frame 1u. In that case, in the dismantling of the above-described ground frame 1u, The floor portion 5 and the beam portion 9 of the ground floor 1F are also dismantled.

  By the way, before dismantling the ground frame 1u, the floor 5 of the first floor 1F and the floor 5 of the first floor B1F may be supported from below by a temporary tension rod member (not shown). In this way, traveling on the floor 5 of the ground floor 1F of the heavy machinery used for dismantling the ground frame 1u can be allowed without any problem.

  After disassembling the above ground frame 1u, next, in order to secure the installation space S70 of the seismic isolation device 70 in the basement, a modification is made to disassemble a part of the upper part of the underground frame 1d as shown in FIG. 1C (underground frame) Equivalent to the remodeling process). In this example, as a part of the upper part of the underground housing 1d, the floor 5 of the ground floor 1F shown in FIG. 1B, the beam 9 integrally connected to the floor 5 and projecting downward, and the ground floor The column part 7 of B1F is disassembled to a state as shown in FIG. 1C. As described above, when the floor 5 and the beam 9 of the ground floor 1F have been disassembled when the ground frame 1u is disassembled, the basement 1st floor is used as a part of the upper part of the underground frame 1d. Only the column part 7 of B1F is disassembled. This completes the modification of the underground housing 1d. Hereinafter, the modified underground structure 1d in FIG. 1C is referred to as an underground structure 11d in order to distinguish it from the unmodified structure 1d. In addition, this underground frame 11d is also the underground frame 11d of the base-isolated building 11 of FIG. 1F.

  Here, as apparent from the above, from the dismantling target range in the underground skeleton 1d of the existing building 1, the outer wall 3 of the underground skeleton 1d and the portion 1dp below the floor 5 of the first basement B1F are excluded. That is, these portions 3 and 1dp are used as they are. Therefore, the amount of work for dismantling can be greatly reduced, and construction costs can be reduced. The basement floors B2F to B5F below the second basement floor are used as new basement floors (new B1F to new B4F) as they are even after the seismic isolation building 11 shown in FIG. 1F is completed. Therefore, the construction cost can be further suppressed.

  Furthermore, during this construction, the outer wall 3 of the underground frame 1d in FIG. 1C functions as a retaining wall. In that case, including the floor 5 and the beam 9 of the first basement B1F, In addition, the floor portions 5 and the beam portions 9 of the lower underground floors B2F to B5F function as cut beams that horizontally support the outer wall portion 3 serving as a retaining wall. Therefore, it is possible to ease the beam support work.

  Further, in the first embodiment, the dismantling target range of the underground skeleton 1d is divided into the floor portion 5 of the ground floor 1F, the beam portion 9 that is integrally connected to the floor portion 5 and protrudes downward, and the first basement floor. Like the column part 7 of B1F, it is kept to the minimum range required for arrangement | positioning to the underground space S70 of the seismic isolation apparatus 70. FIG. Therefore, the size of the remaining part of the underground building 1d of the existing building 1 can be secured large. As a result, the weight of the remaining part is effective for the buoyancy imparted from the groundwater during construction. Can be countered and the measures to prevent ascent can be relaxed.

  After disassembling a part of the upper part of the underground skeleton 1d in this way, next, as shown in FIG. 1D, the seismic isolation device 70 is installed in the underground space S70 formed by the dismantling (in the seismic isolation device installation process). Equivalent). In this example, the seismic isolation device 70 is installed in a space formed by dismantling the column portion 7 of the first basement B1F. At this time, the seismic isolation device 70 is installed and supported on the upper surface of the floor 5 of the first basement B1F. Therefore, the installation worker can safely perform the installation work using the floor 5 as a work scaffold. In addition, the floor 5 also serves as a work passage for going to the place where the seismic isolation device 70 is installed during periodic maintenance inspection work of the seismic isolation device 70 even after the completion of the seismic isolation building 11 of FIG. 1F. It is effectively used as a work scaffolding and contributes to the improvement of work safety.

  Desirably, the above-described seismic isolation device 70 is preferably installed in a portion directly above the beam portion 9 or the column beam joint portion J in the floor portion 5 of the first basement B1F. In the example of FIG. 1D, it is provided immediately above the column beam joint J. And if it is installed in the said part, since the underground frame 11d can receive the horizontal force input from the seismic isolation apparatus 70 after completion of the seismic isolation building 11 in the beam part 9 and the column part 7, the said horizontal The input of the bending moment to the column part 7 by force can be reduced. As a result, breakage of the column portion 7 can be effectively prevented through significant suppression of horizontal deformation of the column portion 7.

  Incidentally, in this example, since the beam portion 9 and the column beam joint portion J are integrated with the floor portion 5, the above-described bending deformation of the column portion 7 can be further suppressed by the floor portion 5. Even when the floor portion 5 is not provided, that is, when only the beam portions 9 are arranged in a grid in the horizontal and vertical directions, the seismic isolation device 70 is disposed immediately above the beam portion 9 or the column beam joint portion J. If it has, the damage prevention effect of the corresponding pillar part 7 can be acquired.

  More preferably, as shown in FIG. 1D, all the seismic isolation devices 70 may be installed directly above the column beam joint J or directly above the beam portion 9, but at least one seismic isolation device may be used. If 70 is installed in the part directly above the column beam joint J or the part directly above the beam part 9, the effect of preventing damage to the column part 7 in the vicinity thereof can be obtained. Therefore, several seismic isolation devices 70 are arranged immediately above the column beam joint portion J or the beam portion 9, and the remaining seismic isolation devices 70 are connected to the column beam joint portion J and the beam portion 9 in the floor portion 5. You may arrange | position in parts other than immediately above.

  As the seismic isolation device 70, for example, laminated rubber, a sliding bearing, or a rolling bearing is used. As a result, after the seismic isolation building 11 as shown in FIG. 1F is completed, the ground side frame 11u is subjected to horizontal isolation on the underground frame 11d. That is, the input of the horizontal ground motion from the underground housing 11d to the ground-side housing 11u is reduced.

  Once the seismic isolation device 70 is installed in this way, next, as shown in FIG. 1E, the floor portion 5 of the first floor 1F above the ground seismic isolation device 70 and the floor portion 5 are integrally connected. Thus, the beam portion 9 projecting downward is constructed, and thereby the floor portion 5 is supported by the seismic isolation device 70 via the beam portion 9. At this time, as described above, since the seismic isolation device 70 is disposed in the underground space S70, the upper surface level of the floor portion 5 of the first floor 1F can be aligned with the level GL of the surrounding ground. Or, even if there is a height difference, it can be accommodated in some amount. Therefore, in the design of the ground floor of the seismic isolation building 11 shown in FIG. 1F, the seismic isolation device 70 is released from the restrictions of the entire floor from the first floor 1F to the top floor 12F, and the ground floor is It becomes possible to design freely.

  Incidentally, when the floor height of the first basement floor B1F is high, a column for raising (between the beam part 9 adjacent to the lower part of the floor part 5 of the ground floor 1F of FIG. 1E and the seismic isolation device 70 ( (Not shown) may be interposed.

  Further, the floor portion 5 and the beam portion 9 of the ground floor 1F are provided with a predetermined gap δ so as to be cut off from the outer wall portion 3 of the underground frame 11d. Thereby, the ground side frame 11u of FIG. 1F to be provided thereafter, including the floor 5 and the beam 9 of the first floor 1F above, is horizontally isolated on the underground frame 11d without any interference. Become.

  Then, as shown in FIG. 1F, on the floor portion 5 of the ground floor 1F, the pillar portion 7, the beam portion 9, the floor portion 5, and the number and size according to the number of floors of the ground floor to be formed, and By providing the outer wall 3, a ground side housing 11 u having 12 ground floors as an example of a plurality of floors is formed (corresponding to a ground side housing forming step). And the seismic isolation building 11 of 1st Embodiment is completed by the above.

  By the way, after the seismic isolation building 11 is completed, the seismic isolation device 70 is installed on the floor that is the first basement B1F in the existing building 1. Therefore, after the seismic isolation building 11 is completed, the basement first floor B1F where the seismic isolation device 70 is arranged becomes a seismic isolation pit (base isolation layer), and is removed from the concept of the basement floor of the base isolation building 11. . Therefore, the number of basement floors of this seismic isolation building 11 is less than that of the existing building 1. For example, in the existing building 1 in FIG. 1A, the floors that were the second basement B2F and the third basement B3F become the first basement (new B1F) and the second basement B2F (new B2F) in the base-isolated building 11 in FIG. 1F, respectively. As described above, the floor number of the basement floor of the seismic isolation building 11 is updated by one down from the floor number of the basement floor of the existing building 1.

=== Second Embodiment ===
2A to 2F are explanatory diagrams of a construction method of the seismic isolation building 11a of the second embodiment. Each figure is a schematic diagram in a longitudinal sectional view, but hatching that should originally be shown in a sectional portion is omitted in order to prevent complication of the figure.
In the above-described first embodiment, in order to form the installation space S70 of the seismic isolation device 70 in the basement, the floor 5 of the first floor 1F and the lower part thereof are integrally formed as a dismantling target range of the underground frame 1d of the existing building 1. Although the connecting beam portion 9 and the column portion 7 of the first basement B1F have been designated (FIG. 1C), as can be seen by comparing FIG. 2A before disassembly and FIG. 2B after disassembly, this second embodiment Then, in addition to these, the main difference is that the dismantling target range is further extended to the floor portion 5 of the first basement B1F and the beam portion 9 integrally connected therebelow.

  The reason why this is done is that the floor height of the space to be a new basement floor (new B1F) in the underground building 11ad in FIG. 2F is the floor height of the corresponding basement floor in the existing building 1 in FIG. 2A. This is because the floor height of the second basement B2F is larger. That is, as can be seen from the comparison between FIG. 1F and FIG. 2F, in the base-isolated building 11a of the second embodiment of FIG. The floor height of (New B1F) is large. Incidentally, as a need to increase the height of the floor, for example, to use the first basement floor (new B1F) as an underground parking lot. Since the other points are generally the same as those of the first embodiment, the difference will be mainly described below, and the description of the same contents will be omitted.

Hereinafter, the construction method of the seismic isolation building 11a of 2nd Embodiment is demonstrated.
First, as shown in FIG. 2A, the ground frame 1u is disassembled (corresponding to a ground frame dismantling process).

  Next, the underground structure 1d is modified (corresponding to the underground structure modification process). That is, first, as shown in FIG. 2B, a part of the upper part of the underground building 1d is dismantled. Here, the “part of the upper portion” refers to the floor portion 5 of the ground floor 1F shown in FIG. 2A, the beam portion 9 that is integrally connected to the floor portion 5 and protrudes downward, and the underground ground floor B1F. The column part 7, the floor part 5 of the first basement B1F, and the beam part 9 integrally connected to the floor part 5 and projecting downward. Therefore, by this dismantling, only the column part 7 and the outer wall part 3 of the second basement floor B2F remain on the floor part 5 of the second basement floor B2F as shown in FIG. 2B. Then, these remaining portions and the portion 1dp below the floor portion 5 of the underground second floor B2F of the underground housing 1d are used as they are. Incidentally, the basement floors B3F to B5F below the third basement floor are left and used as new basement floors (new B2F to new B4F) even after the seismic isolation building 11a in FIG. 2F is completed.

  If it does so, as shown to FIG. 2C, the support housing 72 for mounting and supporting the seismic isolation apparatus 70 will be newly installed in the underground housing 1d. The support housing 72 is newly installed at a height position where the floor height of the second basement floor B2F is enlarged. For example, a column part 7a for raising is added to the upper part of each column part 7 of the second floor B2F, a plurality of beam parts 9a are provided continuously to the column part 7a, and the beam ends of each beam part 9a are connected to the underground frame. The support housing 72 is formed by connecting to the outer wall 3 of 1d and providing the floor portion 5a integrally with the upper portion of the beam portion 9a. Then, with the formation of the support housing 72, the modification of the underground housing 1d is completed, and the underground housing 1d is used as the underground housing 11ad for the base-isolated building 11a of FIG. 2F. After the base-isolated building 11a shown in FIG. 2F is completed, the second basement floor B2F located below the support housing 72 functions as a new first basement floor (new B1F). The first basement level (new B1F) has been formed.

  Incidentally, during the subsequent construction, the support frame 72 also functions as a beam that horizontally supports the outer wall 3 of the underground frame 11ad.

  In addition, in the example of FIG. 2C, the support housing 72 has a floor portion 5a in addition to the beam portion 9a, so that the floor portion 5a is connected to the seismic isolation device 70 as in the case of the first embodiment. Although it can be used as a work passage or work scaffold during installation work, the floor 5a may be omitted.

  When the support housing 72 is newly provided in this way, next, as shown in FIG. 2D, the seismic isolation device 70 is installed on the support housing 72 (corresponding to the seismic isolation device installation step). The installation position of the seismic isolation device 70 is set, for example, at a portion directly above the column beam joint J or the beam portion 9a included in the support housing 72. And if it does in this way, based on the effect | action of the beam part 9a of the support housing 72, the damage prevention effect of the pillar part similar to the case of the above-mentioned 1st Embodiment will be given to the pillar parts 7a and 7 of B2F underground B2F. You can play against it. However, the present invention is not limited to this, and the seismic isolation device 70 may be installed in a portion other than the column beam joint portion J and the beam portion 9a in the floor portion 5a.

  After installing the seismic isolation device 70 in this way, next, as shown in FIG. 2E, the beam is newly connected to the floor 5 of the first floor 1F above and below the seismic isolation device 70 integrally. The part 9 is constructed, whereby the floor part 5 is supported by the seismic isolation device 70 via the beam part 9.

  Then, as shown in FIG. 2F, on the floor portion 5 of the first floor 1F, the pillar portion 7, the beam portion 9, the floor portion 5, and the outer wall of the quantity and size according to the number of floors of the ground floor to be formed. The portion 3 is provided, thereby forming the ground side housing 11au having a plurality of ground floors (corresponding to the ground side housing forming step). And the seismic isolation building 11a of 2nd Embodiment is completed by the above.

=== Third Embodiment ===
3A to 3E are explanatory diagrams of the construction method of the seismic isolation building 11b of the third embodiment. Each figure is a schematic diagram in a longitudinal sectional view, but hatching that should originally be shown in a sectional portion is omitted in order to prevent complication of the figure.
In the first embodiment described above, as shown in FIG. 1F, the installation space S70 for the seismic isolation device 70 is formed at a position corresponding to the first basement floor B1F of the existing building 1. That is, although the installation target floor of the seismic isolation device 70 is set to the first basement B1F in the existing building 1, it is not limited to this. For example, the installation target floor may be any basement floor B2F to B4F below the second basement floor B2F excluding the lowest floor B5F. Below, the construction method in that case will be described by taking as an example the case where the installation target floor is B2F (FIG. 3E).

  Also in the construction method of the seismic isolation building 11b, first, as shown in FIG. 3A, the ground frame 1u is dismantled (corresponding to the ground frame dismantling process).

  Next, as shown in FIG. 3B, a part of the upper part of the underground skeleton 1d is disassembled and remodeled (corresponding to the underground skeleton remodeling process). Here, as can be seen in comparison with FIG. 3A before dismantling, the “part of the upper part” means the floor on which the seismic isolation device 70 is installed in the basement 1d except for the outer wall 3 of the basement 1d. It is a part located above the floor part 5 of this. In this example, since the installation target floor is the second basement floor B2F as described above, the portion located above the floor 5 of the second basement floor B2F is to be dismantled. More specifically, the floor portion 5 of the ground floor 1F of FIG. 3A, the beam portion 9 that is integrally connected to the floor portion 5 and protrudes downward, the column portion 7 of the basement floor B1F, The floor portion 5 of the first floor B1F, the beam portion 9 integrally connected to the floor portion 5 and projecting downward, and the column portion 7 of the second basement B2F are to be dismantled.

  Then, after this dismantling, as shown in FIG. 3B, only the outer wall 3 remains on the floor 5 of the second basement floor B2F, thereby completing the modification of the basement 1d. That is, the remaining portion 3 and the portion 1dp below the floor portion 5 of the second basement floor B2F of the underground skeleton 1d are left and used as the underground skeleton 11bd of the base-isolated building 11 of FIG. 3E.

  Then, as shown in FIG. 3C, the seismic isolation device 70 is installed on the upper surface of the floor portion 5 of the second basement floor B2F (corresponding to the seismic isolation device installation process).

  Next, as shown in FIG. 3D, a beam portion 9 is newly constructed above the seismic isolation device 70 so as to be integrally connected to the floor portion 5 of the first basement floor B1F and the lower portion thereof. The base 5 is supported by the seismic isolation device 70 via

  Then, on the floor 5 of the first basement floor B1F, the column part 7, the beam part 9, the floor part 5, and the outer wall part 3 having a quantity and size corresponding to the number of floors of the basement first floor B1F and the ground floor are provided. As a result, the ground side housing 11bu having the first basement floor B1F and a plurality of ground floors 1F to 12F as shown in FIG. 3E is formed (corresponding to the ground side housing forming step). And the seismic isolation building 11b of 3rd Embodiment is completed by the above.

=== Other Embodiments ===
As mentioned above, although embodiment of this invention was described, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. Further, the present invention can be changed or improved without departing from the gist thereof, and needless to say, the present invention includes equivalents thereof. For example, the following modifications are possible.

  In the above-described embodiment, the structural styles of the ground frame 1u of the existing building 1 and the ground side frames 11u, 11au, 11bu of the base-isolated buildings 11, 11a, 11b have not been described, but these frames 1u, 11u, 11au. , 11bu may be constructed by RC construction, S construction, SRC construction, or a combination of these.

  In the above-described embodiment, the structure of the underground skeleton 1d of the existing building 1 and the underground skeletons 11d, 11ad, and 11bd of the seismic isolation buildings 11, 11a, and 11b has not been described, but these skeletons 1d, 11d, 11ad, Since 11bd is provided in the ground, it is desirable that the 11bd be constructed with an RC structure or an SRC structure without the risk of rusting.

  In the above-described embodiment, the partition wall that divides the ground floor and the basement floor of the existing building 1 and the seismic isolation buildings 11, 11a, and 11b into several rooms is not illustrated, but the present invention is not limited to this. A partition wall may be provided.

  In the above-described embodiment, a damper member such as an oil damper that attenuates horizontal vibrations of the ground-side housings 11u, 11au, and 11bu with respect to the underground housings 11d, 11ad, and 11bd, and a ground-side housings 11u, 11au with respect to the underground housings 11d, 11ad, and 11bd. , 11bu is not exemplified by an elastic member such as a spring that returns the horizontal position to the reference position, but the present invention is not limited to this, and a damper member or an elastic member may be provided.

  In the above-described embodiment, the elevating means that connects the upper and lower floors such as an elevator is not illustrated, but as the elevating means, known devices such as an elevator, an escalator, and a staircase can be applied. For example, an elevator or a staircase may be provided in the ground side housings 11u, 11au, 11bu so as to connect the floors belonging to the ground side housings 11u, 11au, 11bu. An elevator or a staircase may be provided so as to connect the floors belonging to the underground structures 11d, 11ad, and 11bd. In addition, as for the elevating means for connecting the floor of the underground frame 11d, 11ad, 11bd and the floor of the ground side frame 11u, 11au, 11bu supported by seismic isolation to the underground frame 11d, 11ad, 11bd, If elevating means having a structure that allows relative displacement between the casings 11d, 11ad, and 11bd and the ground side casings 11u, 11au, and 11bu is applied, this can be achieved without any problems. For example, when the ground-side housings 11u, 11au, and 11bu are horizontally isolated from the underground housings 11d, 11ad, and 11bd, first, the ground-side housings 11u, 11au, The elevator shaft for connection is provided through the floor of each floor across the floor of 11bu, and a riding rod is provided in the hollow space in the elevator shaft so as to be able to move up and down. And as a structure which accept | permits horizontal relative displacement between the underground frame 11d, 11ad, 11bd and ground side frame 11u, 11au, 11bu which concern on horizontal seismic isolation, the floor part of the floor of the ground side frame 11u, 11au, 11bu It is conceivable to provide a gap larger than the assumed horizontal relative displacement between the hole for passing the elevator shaft formed through 5 and the elevator shaft.

  In the above-described embodiment, the case where the ground-side housings 11u, 11au, and 11bu are subjected to horizontal seismic isolation by the seismic isolation device 70 such as laminated rubber is exemplified. However, the present invention is not limited to horizontal seismic isolation. The vertical seismic isolation device may be applied as much as possible, and more specifically, a three-dimensional seismic isolation device having both horizontal and vertical seismic isolation functions may be used.

1 existing building, 1d underground structure, 1dp part, 1u ground structure,
3 outer wall part, 5 floor part, 5a floor part, 7 pillar part, 7a pillar part, 9 beam part,
11 Base-isolated building, 11d underground structure, 11u ground side structure,
11a base-isolated building, 11ad underground structure, 11au ground side structure,
11b Base-isolated building, 11bd underground frame, 11bu ground side frame,
70 seismic isolation device, 72 support housing,
J column beam joint,
BP pit, St space,
S70 Installation space (underground space),
G Ground, GL Ground level

Claims (6)

A method of constructing a base-isolated building using an underground building of an existing building having a basement floor,
A ground frame dismantling process for demolishing the ground frame of the existing building;
An underground structure remodeling step of remodeling the underground structure by dismantling a part of the upper part of the underground structure while using at least one underground floor of the underground structure of the existing building.
While installing the seismic isolation device in the underground space formed by dismantling part of the upper part, the seismic isolation device installation step for supporting the seismic isolation device on the underground frame,
And a ground-side housing forming step of forming a ground-side housing that has at least a ground floor and is supported by seismic isolation on the underground housing via the seismic isolation device. A method for constructing a base-isolated building according to claim 1,
The basement of the existing building has a plurality of basements,
The seismic isolation device is installed in a portion corresponding to the first basement floor of the existing building,
A method for constructing a base-isolated building, wherein at least a portion below the floor of the second floor of the existing building is left behind. A method for constructing a base-isolated building according to claim 2,
Furthermore, the construction method of the seismic isolation building characterized in that the floor portion of the first basement floor of the existing building is left behind. A method for constructing a base-isolated building according to any one of claims 1 to 3,
A method for constructing a base-isolated building, characterized in that the base isolation device is arranged on the floor of the base body after remodeling in the base body remodeling step. A method for constructing a base-isolated building according to claim 4,
The seismic isolation device is installed immediately above a beam portion of the underground frame or just above a column beam joint. It is a seismic isolation building built using the underground structure of an existing building with a basement floor,
An underground structure modified by dismantling a part of the upper part of the underground structure while using at least one underground floor of the existing structure.
While being arranged in an underground space formed by disassembling a part of the upper part, a seismic isolation device supported by the underground frame,
A base-isolated building having a ground floor and having a ground-side frame supported by the base isolation device.

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