Seismic isolation building

Abstract

To provide a base isolation building 1 that can prevent flooding into a base isolation pit 30 even if flooding depth exceeds height of a retaining wall 23.SOLUTION: The base isolation building 1 of this invention is equipped with a foundation structure 20, a base isolation mechanism 22, and a superstructure 10. The foundation structure 20 includes the retaining wall 23. The superstructure 10 includes a first wall portion 16, a second wall portion 18 housed inside the first wall portion 16, and an opening portion 11 that opens at a position higher than the top of the first wall portion 16. The retaining wall 23 surrounds the base isolation pit 30 and a top edge 23a is higher than a bottom edge 16a of the first wall portion 16. A first channel 16c of the first wall portion 16 forms at least a part of a waterproof wall 180 that prevents water from flowing from outside into the opening portion 11 of the superstructure 10 as the second wall portion 18 is pushed up by water flowing into the first channel 16c from outside.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a seismic isolation building provided with a seismic isolation mechanism between a foundation structure and a superstructure.

Background Art

[0002] A seismic isolation building includes a foundation structure, a seismic isolation mechanism disposed on the foundation structure, and a superstructure supported by the seismic isolation mechanism, and the seismic isolation mechanism suppresses the transmission of horizontal vibrations such as earthquakes to the superstructure.

[0003] Generally, a seismic isolation building is provided with a clearance that allows horizontal movement of the superstructure between the side surface of the superstructure and a retaining wall. And a drainage facility is provided in a seismic isolation pit where laminated rubber is installed as a seismic isolation device, and it has a structure that prevents water from entering or accumulating.

[0004] However, in recent years, flood damage and landslide disasters associated with abnormal weather have been incessant. Even in a seismic isolation pit equipped with a drainage facility, there is a risk that water and soil may enter due to flooding caused by heavy rain or river flooding during construction or after the start of operation, or burial of soil and sand due to landslide disasters.

[0005] As a waterproof structure for the seismic isolation mechanism, a waterproof covering portion made of a waterproof sheet detachably provided so as to cover the outer periphery of the laminated rubber body has been proposed (Patent Document 1).

[0006] Also, an invention has been proposed in which a waterproof plate equipped with an automatic operation mechanism is installed at the entrance for the purpose of preventing rainwater from entering from the entrances of underground parking lots, machine rooms, etc. (Patent Document 2).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Summary of the Invention

[0008] However, the invention described in Patent Document 1 requires the waterproof covering made of a specially shaped waterproof sheet and the cushioning material made of foamed plastic to be manufactured to match the shape of the seismic isolation mechanism. Furthermore, the invention described in Patent Document 2 is installed at the entrances and exits of underground facilities, and its application to seismic isolation pits has not been considered.

[0009] Therefore, the present invention aims to provide a seismically isolated building that can prevent water from entering the seismic isolation pit even when the flood depth exceeds the height of the seismic isolation pit, and can also prevent water from flowing into the openings of the superstructure from the outside. [Means for solving the problem]

[0010] The present invention has been made to solve at least some of the above-mentioned problems and can be realized in the following embodiments or applications.

[0011] [1] One embodiment of a seismically isolated building according to the present invention is: The structure comprises a foundation structure, a plurality of seismic isolation mechanisms installed within a seismic isolation pit of the foundation structure, and a superstructure supported by the plurality of seismic isolation mechanisms. The aforementioned foundation structure includes a retaining wall extending upward from the foundation structure. The superstructure comprises a first wall portion extending downward from the superstructure, a second wall portion housed inside the first wall portion, and an opening that opens at a position higher than the upper end of the first wall portion. Prepare, The retaining wall is provided so as to surround the seismic isolation pit, and the upper end of the retaining wall is located higher than the lower end of the first wall section and is positioned at a distance from the superstructure. The first wall surrounds the outside of the retaining wall, is positioned at a distance from the retaining wall, and has a water channel inside it. The flow path communicates with the outside through a water intake opening that opens on the outer surface of the first wall portion, and is configured such that water flows from the water intake opening downward of the second wall portion. The second wall portion pushed up by the water flowing into the flow path from the outside forms at least a part of a waterproof wall that prevents water from flowing into the opening portion of the superstructure from the outside. death, The first wall portion further includes a partition plate inside which divides the flow path into a first flow path and a second flow path. The first flow path is formed inside the first wall and accommodates the second wall. The second flow channel is formed outside the first wall portion and communicates with the outside at the water intake, and is configured such that water flows into the lower part of the second wall portion in the first flow channel from the water intake, thereby pushing up the second wall portion. It is characterized by this.

[0012] [2] In one aspect of the seismic isolation building, The waterproof wall In the circumferential direction of the superstructure can be formed by the continuous second wall portion.

[0013] [3] In one aspect of the seismic isolation building, The seismic isolation building further includes a plurality of guide plates arranged at intervals around the superstructure. each other The waterproof wall can be continuous with both ends of the pushed-up second wall portion contacting the adjacent guide plates. In the circumferential direction of the superstructure

[0014] [4] In one aspect of the seismic isolation building, The plurality of guide plates may include at least two guide plates connected to the outer wall of the superstructure.

[0015] [5] In one aspect of the seismic isolation building, The waterproof wall can surround the entire circumference of the superstructure.

[0016] [[ID=

[46] ]][6] In one aspect of the seismic isolation building, The retaining wall further includes a water stop rubber fixed along the upper end. The superstructure has a smooth surface facing the water stop rubber. The water stop rubber includes a fixing portion fixed to the retaining wall and a seal portion protruding from the fixing portion. The sealing part can prevent water from flowing into the seismic isolation pit from the outside by the free end of the sealing part contacting the smooth surface.

[0017] [7]In one aspect of the above seismic isolation building, The first wall portion further includes a wire having one end fixed to the second wall portion, a pulley fixed to the first wall portion, and a counterweight suspended from the other end of the wire passing through the pulley. The counterweight can be accommodated inside the first wall portion. [8] In one aspect of the above seismic isolation building, The second wall portion is configured with the lower end of the second wall portion as a piston. The first flow path is configured as a cylinder. The second wall portion can rise by the water pressure of the water flowing in below the second wall portion.

Effect of the Invention

[0018] According to one aspect of the seismic isolation building according to the present invention, even if the immersion depth exceeds the height of the seismic isolation pit, it is possible to prevent the immersion of water into the seismic isolation pit and prevent water from flowing into the opening of the superstructure from the outside.

Brief Description of the Drawings

[0019] [Figure 1] It is a front view of the seismic isolation building according to the present embodiment. [Figure 2] It is a plan view of the seismic isolation building according to the present embodiment. [Figure 3] It is a cross-sectional view showing an enlarged view of the portion surrounded by the broken line in FIG. 1 in normal times. [Figure 4] It is a cross-sectional view showing an enlarged view of the portion surrounded by the broken line in FIG. 1 during a flood. [Figure 5] It is a cross-sectional view of the water stop rubber. [Figure 6] It is a cross-sectional view of the first wall portion and the second wall portion of the seismic isolation building according to Modification 1. [Figure 7]This is a plan view of the first and second walls of a seismically isolated building according to Modification Example 1. [Figure 8] This is a front view of the first and second walls of a seismically isolated building according to Modification 1. [Figure 9] This is a floor plan of a seismically isolated building according to modified example 2. [Figure 10] This is a floor plan of a seismically isolated building according to Modification 3. [Figure 11] This is a cross-sectional view of the waterproofing rubber according to Modification 3. [Modes for carrying out the invention]

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the drawings. The embodiments described below are not intended to unduly limit the scope of the present invention as described in the claims. Furthermore, not all of the configurations described below are necessarily essential components of the present invention.

[0021] One embodiment of a seismically isolated building according to this embodiment comprises a foundation structure, a plurality of seismic isolation mechanisms installed in a seismic isolation pit of the foundation structure, and a superstructure supported by the plurality of seismic isolation mechanisms, wherein the foundation structure includes a retaining wall extending upward from the foundation structure, the superstructure includes a first wall portion extending downward from the superstructure, a second wall portion housed inside the first wall portion, and an opening that opens at a position higher than the upper end of the first wall portion, and the retaining wall is provided to surround the perimeter of the seismic isolation pit. Furthermore, the upper end of the retaining wall is positioned higher than the lower end of the first wall portion and is spaced apart from the superstructure, the first wall portion surrounds the outside of the retaining wall and is spaced apart from the retaining wall, and has a water channel through which water flows, the channel communicating with the outside, and the second wall portion, which is pushed up by water flowing into the channel from the outside, forms at least a part of a waterproof wall that prevents water from flowing into the opening of the superstructure from the outside.

[0022] 1. Overview of seismically isolated buildings An overview of a seismically isolated building 1 according to one embodiment of the present invention will be described using Figures 1 and 2. Figure 1 is a front view of the seismically isolated building 1 according to this embodiment, and Figure 2 is a plan view of the seismically isolated building 1 according to this embodiment. The left side of Figure 1 shows a flood or other condition where the water level is higher than the seismic isolation pit 30, and the water 50 is shown in shaded areas, while the right side of Figure 1 shows the normal state.

[0023] As shown in Figure 1, the base-isolated building 1 comprises a foundation structure 20, a plurality of base isolation mechanisms 22 installed in a base isolation pit 30 of the foundation structure 20, and a superstructure 10 supported by the plurality of base isolation mechanisms 22.

[0024] The superstructure 10 has a structural frame, for example, a steel frame, whose lower end is supported by a seismic isolation mechanism 22. The superstructure 10 may be made of reinforced concrete, steel-reinforced concrete, etc. The superstructure 10 can be two stories or more and is particularly applicable to high-rise buildings. The 1F of the superstructure 10, which is the floor directly above the seismic isolation layer where the seismic isolation pit 30 is located, is supported by a plurality of seismic isolation mechanisms 22 via footings. The superstructure 10 has at least one opening 11 that opens into the outer wall 12 of the floor directly above the seismic isolation layer, and the opening 11 is, for example, an entrance to the floor directly above.

[0025] As shown in Figures 1 and 2, the superstructure 10 has a dog run-shaped upper slab 13 that projects horizontally outward from the lower end of the outer wall 12 (along the planes where the X and Y axes exist). The upper slab 13 is made of reinforced concrete, for example. The upper slab 13 is formed continuously around the entire circumference of the superstructure 10. The upper slab 13 is formed to extend horizontally beyond the retaining wall 23 to the outside of the retaining wall 23, and the horizontal clearance (between the retaining wall 23 and the upper It is configured to cover the horizontal gap between the structure 10 and the upper structure 10. This horizontal clearance is set to a distance that allows for relative horizontal movement between the retaining wall 23 and the superstructure 10 during an earthquake assumed for the base-isolated building 1. Therefore, even if the horizontal clearance changes due to an earthquake, the upper slab 13 always covers the area above the horizontal clearance, so the base isolation pit 30 is not visible in plan view. The upper slab 13 is sometimes called an apron. The upper slab 13 has a plate-like flange shape extending from the base end connected to the outer wall 12 to the free end, but it is not limited to this, and an interior space may be provided on top of the upper slab 13.

[0026] The superstructure 10 comprises a first wall portion 16 extending downward from the superstructure 10, a second wall portion 18 housed inside the first wall portion 16, and an opening 11 that opens at a position higher than the upper end of the first wall portion 16. In this embodiment, the first wall portion 16 is attached so as to hang down from the outer edge of the upper slab 13. The upper end of the first wall portion 16 can be at approximately the same height as the upper surface of the upper slab 13. If the opening 11 is an entrance to the 1st floor, the lower end of the opening 11 is at approximately the same height as the upper surface of the upper slab 13, and if there is no second wall portion 18 (waterproof wall 180), water can easily flow from the opening 11 into the superstructure 10. Also, even if the opening 11 is not an entrance (for example, a window), if the lower end of the opening 11 is at a low position, water can easily flow from the opening 11 into the superstructure 10 if there is no second wall portion 18 (waterproof wall 180). Generally, a base-isolated building 1 is provided with a staircase connecting the base isolation pit 30 to the floor directly above it, so flooding from the opening 11 leads to flooding of the base isolation pit 30. The second wall section 18 is housed inside the first wall section 16 under normal conditions, as shown on the right side of Figure 1, and moves above the first wall section 16 during floods, as shown on the left side of Figure 1, to form at least a part of the waterproof wall 180. Therefore, under normal conditions, there is no waterproof wall 180 on the upper slab 13, so it does not obstruct horizontal access to the 1st floor of the superstructure 10, for example, to the opening 11. The base-isolated building 1 may, for example, be used as a warehouse if the superstructure 10 is used as such, in which case the height of the truck berth becomes the height of the upper slab 13 and the floor slab of the 1st floor.

[0027] The foundation structure 20 is located below the superstructure 10 and is a structure constructed on the ground. The foundation structure 20 transmits the load of the superstructure 10 to the ground via a seismic isolation mechanism 22. Below the foundation structure 20, multiple piles 26 (Figures 3 and 4) may be provided, or the foundation structure 20 may be constructed directly on the ground if the ground is stable. The beams and slabs that make up the foundation structure 20 are made of reinforced concrete. The seismic isolation mechanism 22 is fixed to the slab of the foundation structure 20 via a reinforced concrete footing. The foundation structure 20 is equipped with a retaining wall 23 that extends upward from the foundation structure 20.

[0028] Multiple seismic isolation mechanisms 22 are provided for the seismically isolated building 1. The multiple seismic isolation mechanisms 22 are installed at intervals from each other in multiple locations within the seismic isolation pit 30. The seismic isolation mechanisms 22 are fixed to the foundation structure 20 via footings. The seismic isolation mechanism 22 is a mechanism that supports the superstructure 10, reduces horizontal shaking such as earthquakes transmitted to the superstructure 10, and provides a force to restore the relative position of the superstructure 10 to its original state; it is a so-called isolator. The seismic isolation mechanism 22 is preferably made of laminated rubber or a sliding bearing that has little vertical change, and Figure 1 shows an example in which the seismic isolation mechanism 22 is made of laminated rubber. The seismic isolation mechanism 22 may further include dampers that provide damping.

[0029] As shown in Figure 2, in the base-isolated building 1, the upper slab 13 extends in a flange shape around the superstructure 10, and the first wall section 16 and the second wall section 18 extend along the outer edge of the upper slab 13. Preferably, the waterproof wall 180 is formed by a continuous second wall section 18. The waterproof wall 180 is a continuous wall that is higher than the upper slab 13, and in this embodiment, it completely encloses the perimeter of the superstructure 10. At a position higher than the upper slab 13, the superstructure 10 can be reliably prevented from being infiltrated by the waterproof wall 180 formed by the second wall section 18. If the raised second wall section 18 can be watertightly integrated with an existing fence or the like that provided on top of the upper slab 13, a part of the waterproof wall 180 may use an existing fence or the like other than the second wall section 18.

[0030] Furthermore, in the base-isolated building 1, a base-isolated pit 30 is formed below the upper slab 13, surrounded by a continuous retaining wall 23, as shown by the dashed line. Therefore, at positions lower than the upper slab 13, the first wall section 16 and the retaining wall 23 can prevent water from entering the base-isolated pit 30.

[0031] 2. Retaining wall, first wall section and second wall section The retaining wall 23, the first wall section 16, and the second wall section 18 will be explained using Figures 1 to 4. Figure 3 is an enlarged cross-sectional view showing the area enclosed by the dashed line in Figure 1 under normal conditions, and Figure 4 is an enlarged cross-sectional view showing the area enclosed by the dashed line in Figure 1 under flood conditions.

[0032] As shown in Figures 1 and 2, the retaining wall 23 is provided to surround the seismic isolation pit 30. The retaining wall 23 is part of the foundation structure 20 and is formed integrally with the slab of the foundation structure 20. The retaining wall 23 is made of reinforced concrete. The retaining wall 23 is provided continuously around the entire circumference of the foundation structure 20, rising upward from the outer edge of the foundation structure 20, and the inside of the retaining wall 23 is configured as the seismic isolation pit 30. By surrounding the seismic isolation pit 30, the retaining wall 23 prevents soil and water 50 outside the retaining wall 23 from flowing into the seismic isolation pit 30. In this embodiment, the retaining wall 23 extends to a position higher than the ground level (GL), but if the seismic isolation pit 30 is provided underground, it may be made to match the height of the ground level (GL).

[0033] As shown in Figures 3 and 4, the retaining wall 23 is positioned such that its upper end 23a is higher than the lower end 16a of the first wall section 16 and is separated from the superstructure 10 by a first interval L1. By setting the upper end 23a of the retaining wall 23 higher than the lower end 16a of the first wall section 16 that surrounds the outside of the retaining wall 23, the air pressure in the seismic isolation pit 30 acts to prevent the water 50 from rising, thereby preventing flooding beyond the retaining wall 23.

[0034] The retaining wall 23 further includes a waterproofing rubber 40 fixed along its upper end 23a. The superstructure 10 has a smooth surface 13a facing the waterproofing rubber 40. The smooth surface 13a is formed on the lower surface of the upper slab 13. The waterproofing rubber 40 contacts the smooth surface 13a to prevent water from entering the seismic isolation pit 30 from the first gap L1. Details of the waterproofing rubber 40 will be described later.

[0035] The first interval L1 is a vertical gap (along the Z-axis) formed between the upper end 23a of the retaining wall 23 and the smooth surface 13a, which is the lower surface of the upper slab 13 facing the upper end 23a. The first interval L1 allows the upper end 23a of the retaining wall 23 to maintain a non-contact state with the superstructure 10 during the relative horizontal movement of the retaining wall 23 relative to the superstructure 10 due to an earthquake assumed in the base-isolated building 1. The minimum value of the first interval L1 is set to, for example, about 50 mm.

[0036] The first wall section 16 surrounds the outside of the retaining wall 23 and is positioned at a second interval L2 from the retaining wall. The second interval L2 between the first wall section 16 and the retaining wall 23 is closed above by the upper slab 13. Therefore, the space formed by the first wall section 16 and the upper slab 13 prevents the water level of the water 50 in the second interval L2 from rising significantly due to the internal air pressure. By surrounding the outside of the retaining wall 23 in this way, the rise of water 50 between the first wall section 16 and the retaining wall 23 during a flood can be prevented, thus preventing flooding into the seismic isolation pit 30. The second interval L2 is, for example, the distance at which horizontal movement of the superstructure 10 relative to the foundation structure 20 is permitted, and is set according to the earthquake expected in the seismically isolated building 1.

[0037] The first wall portion 16 is provided with a first channel 16c through which water flows. The first channel 16c is located, for example, below the second wall portion 18, and can circulate water around the entire circumference of the first wall portion 16. The first channel 16c may be configured to raise the second wall portion 18 by buoyancy by accumulating water below the second wall portion 18, or, if the lower end of the second wall portion 18 is a piston, the first channel 16c may be configured as a cylinder to raise it by water pressure. The first channel 16c is, The intake port 16b, which opens to the outer surface of the first wall portion 16 via the second channel 16d, communicates with the outside. The intake port 16b is preferably opened at a position lower than the height of the upper slab 13 in order to take in water during floods and store it in the first channel 16c, and the opening area and opening height can be set considering the rate of water rise expected during floods.

[0038] The first wall portion 16 may be provided with a partition plate 16e that forms a first channel 16c and a second channel 16d inside. The partition plate 16e is provided so as to separate the inside (first channel 16c) and the outside (second channel 16d) of the first wall portion 16. The partition plate 16e has a through hole 16f that connects the first channel 16c and the second channel 16d. The through hole 16f is provided, for example, near the lower end 16a. Multiple through holes 16f may be provided, or it may be provided as a single hole extending along the lower end 16a. Water that flows into the second channel 16d from the intake 16b flows into the first channel 16c from the through hole 16f.

[0039] Under normal conditions, the second wall portion 18 is housed inside the first wall portion 16, as shown in Figure 3, with the upper surface of the second wall portion 18 being flush with the upper surface of the upper slab 13. In this embodiment, the second wall portion 18 is located between the inner wall of the first wall portion 16 and the partition plate 16e, and is housed above the first channel 16c. The second wall portion 18 is housed at a height such that the lower end of the second wall portion 18 does not block the first channel 16c and the through hole 16f. During floods, as shown in Figure 4, the second wall portion 18 is pushed up by the water flowing into the first channel 16c from the outside. The second wall portion 18, pushed up by the water to a position higher than the upper slab 13, forms at least a part, preferably all, of a waterproof wall 180 that prevents water from flowing into the opening 11 of the superstructure 10 from the outside. Even if the flood depth exceeds the height of the seismic isolation pit 30 due to flooding, the waterproof wall 180 prevents water from flowing into the opening 11 from the outside, thereby preventing water from entering the seismic isolation pit 30 from the entrance (not shown) to the seismic isolation pit 30 provided in the superstructure 10. The waterproof wall 180 may surround the entire perimeter of the superstructure 10 as shown in Figure 2, or it may be provided to surround the opening 11 between it and the outer wall 12 as shown in Modification 3 (Figure 10) described later. Furthermore, if there are multiple openings 11, a waterproof wall 180 may be provided for each opening 11.

[0040] The second wall 18 is preferably made of a lightweight material that can be pushed up by the water in the first channel 16c. The second wall 18 has excellent waterproofing properties to prevent water from entering from the outside. The second wall 18 is made of aluminum, for example, with an air layer inside. The lower end of the second wall 18 can be structured to obtain buoyancy from the water in the first channel 16c. It is desirable that the second wall 18 is pushed up by the water flowing in from the intake port 16b, but it may also have a power source to assist in the upward movement of the second wall 18.

[0041] In recent years, heavy rains and river flooding due to extreme weather events often exceed the predictions made during construction. Submersion of the seismic isolation pit 30 can impair the function of the seismic isolation mechanism 22 and may also degrade the seismic isolation mechanism 22. For this reason, drainage facilities are provided within the seismic isolation pit 30, but it is more preferable to prevent or suppress flooding into the seismic isolation pit 30 by adopting the configuration of the present invention.

[0042] 3. Waterproof rubber The waterproofing rubber 40 will be explained using Figure 5. Figure 5 is an enlarged cross-sectional view of the waterproofing rubber 40.

[0043] As shown in Figure 5, the water-stopping rubber 40 is fixed around the entire circumference of the retaining wall 23 near the upper end 23a, preventing water from seeping in from the first interval L1.

[0044] The waterproofing rubber 40 comprises a fixing portion 40a fixed to the retaining wall 23 and a sealing portion 40c protruding from the fixing portion 40a. The fixing portion 40a is located on the outer surface near the upper end 23a of the retaining wall 23, for example. It is fixed by multiple bolts 40b. The seal portion 40c has a height that covers the first gap L1. The seal portion 40c prevents water from flowing into the seismic isolation pit 30 from the outside by the free end 40d of the seal portion 40c contacting the smooth surface 13a. In Figure 5, the free end 40d is in contact with the smooth surface 13a, but the free end 40d does not need to be in contact with the smooth surface 13a under normal conditions. In that case, the seal portion 40c can be deformed by the water pressure (indicated by the arrow) during a flood, causing the free end 40d to come into contact with the smooth surface 13a.

[0045] Furthermore, the smooth surface 13a is composed of a flat surface with few irregularities so that the superstructure 10 can move horizontally while the free end 40d of the water-stopping rubber 40 remains in contact with the smooth surface 13a. The smooth surface 13a may also be a sliding plate fixed to the lower surface of the upper slab 13, and for example, a plate with a low coefficient of friction such as a steel plate or a plastic plate can be used.

[0046] In the case of a flood where the water level rises gradually, the water will not rise between the first wall section 16 and the retaining wall 23. However, if, for example, the water level rises rapidly from one side of the seismic isolation building 1, the water level may rise to the top of the retaining wall 23. In that case, the water-stopping rubber 40 can prevent water from entering the seismic isolation pit 30.

[0047] The waterproof rubber 40 is made of known vulcanized rubber that has waterproof properties. Examples of materials for the waterproof rubber 40 include natural rubber, chloroprene rubber, nitrile rubber, ethylene-propylene rubber, silicone rubber, and fluororubber. It may be a rubber made by selecting and blending several types of these, or a composite material made by bonding several types of components together.

[0048] 4. Variation 1 The seismic isolation building 1a according to Modification 1 will be explained using Figures 6 to 8. Figure 6 is a cross-sectional view of the first wall section 16 and the second wall section 18 of the seismic isolation building 1a according to Modification 1, Figure 7 is a plan view of the first wall section 16 and the second wall section 18 of the seismic isolation building 1a according to Modification 1, and Figure 8 is a front view of the first wall section 16 and the second wall section 18 of the seismic isolation building 1a according to Modification 1. Here, in Figure 6, (a) shows the hoisted state, (b) shows the operating state, and (c) shows the fully closed state, Figure 7 shows the inside of each flow path with the cover 18a omitted, and Figure 8 shows the hoisted state on the left and the fully closed state on the right. Furthermore, since the seismic isolation building 1a according to Modification 1 has the same basic configuration as the seismic isolation building 1 according to the above embodiment, redundant explanations will be omitted.

[0049] The first wall section 16 shown in Figures 6 to 8 comprises a wire 62 (shown by a dashed line) with one end fixed to the second wall section 18, a pulley 61 fixed to the first wall section 16, and a counterweight 60 suspended from the other end of the wire 62 via the pulley 61. The pulley 61 is fixed, for example, to the upper part of the partition plate 16e, on the side facing the second flow path 16d. One end of the wire 62 is fixed, for example, to the lower end of the second wall section 18. The wire 62 is fixed to the second wall section 18 near the roller 65, passing through a hole opened in the partition plate 16e from the pulley 61, and an upward force is constantly acting on the second wall section 18 due to the weight of the counterweight 60. The counterweight 60 is housed inside the first wall section 16, for example, in the second flow path 16d. Since the counterweight 60 is housed inside the first wall section 16, the second wall section 18 and other components, including the counterweight 60, can be assembled together as a single assembly of the first wall section 16 at the factory, and this assembly can then be transported to the site and installed, thus simplifying construction. Furthermore, by housing the counterweight 60 inside the first wall section 16, it is possible to prevent the counterweight 60 from swaying due to the flow of water 50 caused by flooding. Note that the first wall section 16 and the second wall section 18 may be assembled at the construction site.

[0050] As shown in Figure 6(a), when the second wall portion 18 is housed within the first wall portion 16, a through hole 16f and a water intake port 16b are formed at a lower position than the second wall portion 18. The lid 18a fixed to the upper end of the second wall portion 18 closes the upper opening of the first wall portion 16 (first flow path 16c). It also functions as a stopper that sets the lower limit of the second wall portion 18. A roller 65 is fixed to the lower end of the second wall portion 18, and the roller 65 rolls vertically along the surface of the partition plate 16e on the first flow path 16c side, guiding the vertical movement of the second wall portion 18.

[0051] As shown in Figures 6 to 8, the second wall section 18 has a lower seal 67 fixed along the lower end of the second wall section 18 and at least one pair of side seals 68 fixed vertically to both the left and right ends of the second wall section 18. The lower seal 67 and the side seals 68 contact the inner surface of the first wall section 16 on the retaining wall 23 side (Figures 3 and 4), preventing water from entering between them and the inner surface of the first wall section 16. The seismic isolation building 1a may further include a plurality of guide plates 64 arranged at intervals around the superstructure 10. The guide plates 64 are provided so as to extend vertically from the upper end of the first wall section 16 or the outer edge of the upper slab 13 at a position where they contact the side seals 68 when the second wall section 18 is raised. By providing a plurality of guide plates 64, the waterproof wall 180 can be constructed with a short second wall section 18, making it easier to handle the second wall section 18 and improving workability. As the second wall portion 18 rises and makes watertight contact with the guide plate 64, a continuous waterproof wall 180 is formed. Therefore, as shown in Figures 6(b) and 6(c), water 50 does not penetrate inward from the second wall portion 18 (to the right in the figure). The guide plate 64 is formed integrally with the first wall portion 16 or the upper slab 13. The guide plate 64 is located between the upper end of the second wall portion 18 and the upper slab 13, and guides the second wall portion 18 when it is raised above the upper slab 13, and prevents it from collapsing towards the upper slab 13. The guide plate 64 is preferably made of a material with excellent waterproofing properties, such as metal. Multiple guide plates 64 are provided at intervals along the inner circumference of the upper end of the first wall portion 16 (outer circumference of the upper slab 13). The guide plates 64 may be provided in a straight section in the X direction as shown in Figure 7, or at the corners in the X and Y directions.

[0052] As shown in Figures 7 and 8, the second wall portion 18 may extend horizontally by connecting a plurality of hollow members 18b. In the example of Figure 7, a plurality of hollow members 18b extend in the X direction to constitute one second wall portion 18, and at the lower end of the figure, hollow members 18b and the second wall portion 18 are also arranged in the Y direction. The waterproof wall 180 forms a continuous structure in which both ends of the pushed-up second wall portion 18 contact adjacent guide plates 64, 64. That is, the guide plates 64 ensure waterproofing by filling the gaps between adjacent second wall portions 18. The hollow members 18b are made of lightweight metal (e.g., aluminum) with an air layer inside, and adjacent hollow members 18b are joined together in a watertight seal. The second wall portion 18 is composed of a plurality of hollow members 18b that are joined together. Adjacent second wall portions 18 may be connected to each other, or they may be independent as in this example. The side seals 68 at both the left and right ends of the second wall section 18 come into contact with the guide plate 64, preventing water from entering the upper slab 13 between adjacent second wall sections 18. Furthermore, when adjacent second wall sections 18 are connected to each other, a continuous waterproof wall 180 surrounding the superstructure 10 can be formed, as in the above embodiment.

[0053] Next, the operation of the second wall section 18 will be explained using Figures 6(a) to 6(c). As shown in (a), in the containment state, the counterweight 60 is lighter than the second wall section 18, so the second wall section 18 can be kept contained within the first wall section 16, and the lid 18a closes the opening at the upper end of the first wall section 16, maintaining the state in which the second wall section 18 is completely contained inside the first wall section 16. Then, in the event of a flood, as shown in (b), the water 50 that flows from the intake 16b into the second channel 16d flows through the through hole 16f into the first channel 16c, and the buoyancy of the water 50 and the weight of the counterweight 60 push up the second wall section 18. At this time, the lower seal 67 and the side seal 68 are pressed against the inner surface of the first wall section 16, so that the water 50 does not enter the upper slab 13 side from the second wall section 18. The amount of buoyancy required to raise the second wall section 18 can be adjusted by changing the weight of the counterweight 60. Finally, as shown in (c), in the fully closed state, the counterweight 60 descends to its lower limit inside the second channel 16d, and the second wall section 18 rises to its upper limit. Then, when the flood subsides, the water in the second channel 16d As the 50 is drained, the buoyancy of the second wall 18 disappears, and the difference in weight between the second wall 18 and the counterweight 60 returns the container to its state of containment in (a).

[0054] 5. Variation 2 Using Figure 9, the base-isolated building 1b according to Modification 2 will be described in detail. Figure 9 is a plan view of the base-isolated building 1b according to Modification 2. Note that the base-isolated building 1b according to Modification 2 has the same basic configuration as the base-isolated building 1 according to the above embodiment, so redundant explanations will be omitted.

[0055] The base-isolated building 1b shown in Figure 9 differs from base-isolated building 1 in that guide plates 64 are provided at each corner of the waterproof wall 180 in plan view. The waterproof wall 180 surrounds the entire perimeter of the superstructure 10. The waterproof wall 180 comprises four second wall sections 18 extending linearly in the X and Y directions, and four guide plates 64 provided at each corner. By providing guide plates 64 at the corners, the second wall sections 18 become linear, simplifying the structure, which reduces the unit cost of the second wall sections 18 and improves constructability.

[0056] The second wall portion 18 may be constructed by connecting multiple hollow members 18b, as shown in Modification 1. Also, although the superstructure 10 in Figure 9 is rectangular in plan view, it may be a more complex superstructure 10, such as an L-shaped or U-shaped structure. In that case as well, the straight parts can be made into the second wall portion 18, and each corner can be made into a guide plate 64, thereby enabling the commonality of parts.

[0057] 6. Variation 3 Using Figures 10 and 11, the base-isolated building 1c according to Modification 3 will be described in detail. Figure 10 is a plan view of the base-isolated building 1c according to Modification 3, and Figure 11 is a cross-sectional view of the waterproofing rubber according to Modification 3. Since the base-isolated building 1c according to Modification 3 has the same basic configuration as the base-isolated building 1 according to the above embodiment, redundant explanations will be omitted.

[0058] The seismically isolated building 1c shown in Figure 10 has an opening 11a on one side of the outer wall 12 of the superstructure 10. If the seismically isolated building 1c is, for example, a warehouse, the upper slab 13 extending in front of the opening 11a may be used as a truck berth, in which case entrances may not be provided on the other side of the outer wall 12. In such a seismically isolated building 1c, it is efficient to provide a waterproof wall 180 only at the location corresponding to the opening 11a. Note that even if there is not only one opening 11a, multiple independent waterproof walls 180 corresponding to each side of the outer wall 12 of the opening 11a may be provided.

[0059] The base-isolated building 1c is equipped with two guide plates 64 spaced apart around the superstructure 10. The waterproof wall 180 is continuous with a second wall section 18 that is pushed up between adjacent guide plates 64. The two guide plates 64 are connected to the outer wall 12 of the superstructure 10. One end of each guide plate 64 is watertightly fixed to the outer wall 12, and the other end is positioned near the outer edge of the upper slab 13 so as to be in watertight contact with the second wall section 18. The outer wall 12, which does not have an opening 11a, is constructed with a highly waterproof building material at least up to the height of the raised second wall section 18. Such a building material could be, for example, a sandwich panel. The outer wall 12 and the guide plates 64 are integrated, and no water seeps in from the connection point. The guide plates 64 are formed in an L-shape in plan view, but they may be of other shapes depending on the connection position with the outer wall 12 and the contact state with the second wall section 18.

[0060] Unlike the one in Figure 5, the waterproofing rubber 40 shown in Figure 11 has a leaf spring 42 between it and the retaining wall 23. The leaf spring 42 is fixed to the outside of the upper end 23a of the retaining wall 23 with a bolt 42a, and the waterproofing rubber 40 is fixed to the upper end side of the leaf spring 42 with a bolt 40b. The leaf spring 42 extends along the upper end 23a. The leaf spring 42 is made of metal, for example, and is more flexible than the waterproofing rubber 40. By providing the leaf spring 42, the waterproofing rubber 40 can be made to make sufficient contact with the smooth surface 13a, even if, for example, there is a large construction error in the first interval L1 or if there are changes due to operation.

[0061] Furthermore, in the seismically isolated building 1c, a stainless steel plate 13b is fixed to the lower surface of the upper slab 13, and the lower surface of the stainless steel plate 13b forms a smooth surface 13a. A material other than the stainless steel plate 13b may be used as long as it has excellent sliding properties and water-sealing properties (flatness) for the water-sealing rubber 40. The leaf spring 42 and stainless steel plate 13b in Figure 11 may be applied to the above embodiment and the above modifications.

[0062] The present invention is not limited to the embodiments described above, and various further modifications are possible. For example, the present invention includes configurations that are substantially identical to the configurations described in the embodiments (for example, configurations with the same function, method, and result, or configurations with the same purpose and effect). The present invention also includes configurations in which non-essential parts of the configurations described in the embodiments are replaced. The present invention also includes configurations that produce the same effects or achieve the same purpose as the configurations described in the embodiments. Furthermore, the present invention includes configurations that add known technology to the configurations described in the embodiments. [Explanation of symbols]

[0063] 1,1a,1b,1c... Seismic isolation building, 10... Superstructure, 11,11a... Opening, 12... Exterior wall, 13... Upper slab, 13a... Smooth surface, 13b... Stainless steel plate, 16... First wall section, 16a... Lower end, 16b... Water intake, 16c... First flow path, 16d... Second flow path, 16e... Partition plate, 16f... Through hole, 18... Second wall section, 18a... Cover, 18b... Hollow member, 180... Waterproof wall, 20... Foundation structure, 2 2... Seismic isolation mechanism, 23... Retaining wall, 23a... Upper end, 26... Pile, 30... Seismic isolation pit, 40... Water-stopping rubber, 40a... Fixing part, 40b... Bolt, 40c... Seal part, 40d... Free end, 42... Leaf spring, 42a... Bolt, 50... Water, 60... Counterweight, 61... Pulley, 62... Wire, 64... Guide plate, 65... Roller, 67... Lower seal, 68... Side seal, L1... First interval, L2... Second interval

Claims

1. The structure comprises a foundation structure, a plurality of seismic isolation mechanisms installed within a seismic isolation pit of the foundation structure, and a superstructure supported by the plurality of seismic isolation mechanisms. The aforementioned foundation structure includes a retaining wall extending upward from the foundation structure. The superstructure comprises a first wall portion extending downward from the superstructure, a second wall portion housed inside the first wall portion, and an opening that opens at a position higher than the upper end of the first wall portion. The retaining wall is provided so as to surround the seismic isolation pit, and the upper end of the retaining wall is located higher than the lower end of the first wall and is positioned at a distance from the superstructure. The first wall surrounds the outside of the retaining wall, is positioned at a distance from the retaining wall, and has a water channel inside it. The flow path is configured to communicate with the outside through an intake opening on the outer surface of the first wall, and for water to flow from the intake opening down to the second wall. The second wall portion, which is pushed up by the water flowing into the channel from the outside, forms at least a part of a waterproof wall that prevents water from flowing into the opening of the superstructure from the outside. The first wall portion further includes a partition plate inside which divides the flow path into a first flow path and a second flow path. The first flow path is formed inside the first wall and accommodates the second wall. A seismically isolated building characterized in that the second flow channel is formed on the outside of the first wall portion so as to communicate with the outside at the water intake, and the second wall portion is pushed up by water flowing into the lower part of the second wall portion in the first flow channel from the water intake.

2. In claim 1, The seismically isolated building is characterized in that the waterproof wall is formed by the second wall portion which is continuous in the circumferential direction of the superstructure.

3. In claim 1, The aforementioned base-isolated building further comprises a plurality of guide plates arranged around the superstructure at intervals from one another, The aforementioned waterproof wall is characterized in that both ends of the second wall portion that has been pushed up contact the adjacent guide plate and are continuous in the circumferential direction of the superstructure, thereby forming a seismically isolated building.

4. In claim 3, A seismically isolated building characterized in that the plurality of guide plates include at least two of the guide plates connected to the outer wall of the superstructure.

5. In any one of claims 1 to 3, The aforementioned waterproof wall is characterized in that it surrounds the entire perimeter of the superstructure, making it a seismically isolated building.

6. In any one of claims 1 to 5, The retaining wall further comprises a water-stopping rubber fixed along the upper end, The superstructure has a smooth surface facing the water-stopping rubber, The aforementioned waterproof rubber comprises a fixing portion that is fixed to the retaining wall and a sealing portion that protrudes from the fixing portion. The aforementioned sealing portion is characterized in that the free end of the sealing portion contacts the smooth surface to prevent water from flowing into the seismic isolation pit from the outside.

7. In any one of claims 1 to 6, The first wall portion further comprises a wire with one end fixed to the second wall portion, a pulley fixed to the first wall portion, and a counterweight suspended from the other end of the wire via the pulley. The seismically isolated building is characterized in that the counterweight is housed inside the first wall.

8. In claim 1, The second wall portion is configured with its lower end as a piston, The first flow path is configured as a cylinder, A seismically isolated building characterized in that the second wall rises due to the water pressure of water flowing below the second wall.

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