Base-isolated building

Abstract

To provide a base-isolated building 1 capable of preventing inundation into a base-isolated pit 30 even if an inundation depth exceeds the height of a retaining wall 23.SOLUTION: The base-isolated building 1 includes a foundation structure 20, a base isolation mechanism 22, and an upper structure 10. The foundation structure 20 comprises a retaining wall 23. The upper structure 10 includes a first wall part 16, a second wall part 18 stored inside the first wall part 16, and an opening part 11 opened at a position higher than an upper end of the first wall part 16. The retaining walls 23 surround the periphery of the base-isolation pit 30, and the upper-end side 23a is located at a position higher than the lower-end side 16a of the first wall part 16. In the first flow path side 16c of the first 16c portion 16, the second wall portion 18 pushed up by water flowing into the first flow path side wall from the outside forms at least a part of a waterproof wall 180 that prevents water from flowing into the opening portion 11 of the upper structure 10 from the outside.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a seismically isolated building equipped with a seismic isolation mechanism between a foundation structure and a superstructure. [Background technology]

[0002] A seismically isolated building includes a foundation structure, a seismic isolation mechanism placed on top of the foundation structure, and a superstructure supported by the seismic isolation mechanism, and the seismic isolation mechanism prevents horizontal shaking caused by earthquakes and other events from being transmitted to the superstructure.

[0003] Generally, seismically isolated buildings have clearance between the sides of the superstructure and the retaining wall to allow horizontal movement of the superstructure. The seismic isolation pit where the laminated rubber bearings are installed as seismic isolation devices is equipped with drainage facilities to prevent water from entering or accumulating.

[0004] However, in recent years, there has been a constant stream of flooding and landslides caused by abnormal weather, and even if a seismic isolation pit is equipped with drainage facilities, there is a risk that water and soil may seep in due to flooding caused by heavy rain or river flooding during construction or after it begins operation, or due to the burial of soil caused by landslides.

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

[0006] Furthermore, an invention has been proposed in which a waterproof board with an automatic operation mechanism is installed at the entrance to prevent rainwater from entering through the entrance to an underground parking lot, machine room, etc. (Patent Document 2). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2018-71705 A [Patent Document 2] Patent No. 3283209 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the invention of Patent Document 1 requires that the waterproof covering made of a specially shaped waterproof sheet and the foam plastic cushioning material be manufactured to fit the shape of the seismic isolation mechanism. Furthermore, the invention of Patent Document 2 is intended to be installed at the entrances and exits of underground facilities, and no consideration has been given to its application to seismic isolation pits.

[0009] Therefore, the present invention aims to provide a seismically isolated building that can prevent water from flooding into the seismic isolation pit even if the water depth exceeds the height of the seismic isolation pit, and can prevent water from flowing from the outside into openings in the superstructure. [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 as the following aspects or application examples.

[0011] [1] One aspect of the seismic isolation building according to the present invention is as follows: The system comprises a foundation structure, a plurality of seismic isolation mechanisms installed in seismic isolation pits of the foundation structure, and an upper structure supported by the plurality of seismic isolation mechanisms, the foundation structure includes a retaining wall extending upwardly from the foundation structure; The upper structure includes a first wall portion extending downward from the upper structure, and a a second wall portion housed therein and an opening portion 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 periphery of the seismic isolation pit, and an upper end of the retaining wall is positioned higher than a lower end of the first wall portion and is disposed at a distance from the superstructure; the first wall portion surrounds the outside of the retaining wall, is disposed at a distance from the retaining wall, and has a flow path through which water flows inside; the flow path directly connects the outside and the inside via a water intake that opens on an outer surface of the first wall portion and is directly open to the outside, and is configured so that water flows from the water intake to below the second wall portion; The second wall portion pushed up by 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 of the upper structure from the outside.

[0012] [2] In one aspect of the above-mentioned seismic isolation building, The watertight wall may be formed by the second wall portion that is continuous in the circumferential direction of the upper structure.

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

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

[0015] [5] In one aspect of the above-mentioned seismic isolation building, The water barrier may surround the entire periphery of the superstructure.

[0016] [6] In one aspect of the above-mentioned seismic isolation building, The retaining wall further includes a water-stop rubber fixed along the upper edge, the upper structure has a smooth surface facing the water-stop rubber, The water-stop rubber includes a fixing portion fixed to the retaining wall and a sealing portion protruding from the fixing portion, The sealing portion can prevent water from flowing into the seismic isolation pit from the outside by contacting the free end of the sealing portion with the smooth surface.

[0017] [7] In one aspect of the above-mentioned seismically isolated 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 via the pulley, The counterweight can be housed within the interior of the first wall portion. [Effects of the Invention]

[0018] According to one aspect of the seismically isolated building of the present invention, even if the depth of flooding exceeds the height of the seismic isolation pit, flooding into the seismic isolation pit can be prevented, and water can be prevented from flowing from the outside into the openings in the superstructure. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a front view of a base-isolated building according to this embodiment. [Figure 2] FIG. 1 is a plan view of a base-isolated building according to this embodiment. [Figure 3] 2 is an enlarged cross-sectional view showing a portion surrounded by a dashed line in FIG. 1 under normal conditions. [Figure 4] FIG. 2 is an enlarged cross-sectional view showing the portion surrounded by the dashed line in FIG. 1 during a flood. [Figure 5] FIG. 2 is a cross-sectional view of a water-stop rubber. [Figure 6] 10 is a cross-sectional view of a first wall portion and a second wall portion of a base-isolated building according to Modification 1. FIG. [Figure 7] FIG. 10 is a plan view of the first wall and the second wall of the base-isolated building according to the first modification. [Figure 8] FIG. 10 is a front view of the first wall and the second wall of the base-isolated building according to the first modification. [Figure 9] FIG. 10 is a plan view of a base-isolated building according to Modification 2. [Figure 10] FIG. 10 is a plan view of a base-isolated building according to Modification 3. [Figure 11] FIG. 10 is a cross-sectional view of a watertight rubber according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

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

[0021] One aspect of a base-isolated building according to this embodiment includes a foundation structure, a plurality of base isolation mechanisms installed in a base isolation pit of the foundation structure, and a superstructure supported by the plurality of base isolation mechanisms, wherein the foundation structure includes a retaining wall extending upward from the foundation structure, and 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 portion that opens at a position higher than the upper end of the first wall portion, and the retaining wall is provided to surround the periphery of the base isolation pit. The upper end of the retaining wall is located 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 is provided with a flow path through which water flows inside, the flow path being connected to the outside, and the second wall portion being pushed up by 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 of the superstructure from the outside.

[0022] 1. Overview of the seismic isolation building An overview of a base-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 base-isolated building 1 according to this embodiment, and Figure 2 is a plan view of the base-isolated building 1 according to this embodiment. The left side of Figure 1 shows a state such as a flood where the water level is above the base isolation pit 30, with the water 50 shown shaded, and the right side of Figure 1 shows a normal state.

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

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

[0025] As shown in FIGS. 1 and 2, the superstructure 10 has a curb-like upper slab 13 that protrudes outward from the lower end of the exterior wall 12 in the horizontal direction (along the plane on which the X-axis and Y-axis exist). The upper slab 13 is made of, for example, reinforced concrete. The upper slab 13 is formed continuously around the entire periphery of the superstructure 10. The upper slab 13 extends horizontally beyond the retaining wall 23 to the outside of the retaining wall 23 and is configured to cover the horizontal clearance (the horizontal distance between the retaining wall 23 and the superstructure 10). The horizontal clearance is set to a distance that allows relative horizontal movement between the retaining wall 23 and the superstructure 10 during an earthquake expected for the seismically 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 seismic isolation pit 30 is not visible in a plan view. The upper slab 13 is sometimes called an apron. The upper slab 13 has a plate-like flange shape that extends from a base end connected to the exterior wall 12 to a free end, but this is not limited to this. An interior space may be provided on the upper slab 13.

[0026] The upper structure 10 includes a first wall 16 extending downward from the upper structure 10, a second wall 18 housed within the first wall 16, and an opening 11 that opens at a position higher than the upper end of the first wall 16. In this embodiment, the first wall 16 is attached so as to hang down from the outer periphery of the upper slab 13. The upper end of the first wall 16 can be set at approximately the same height as the upper surface of the upper slab 13. If the opening 11 is an entrance to the first floor, the lower end of the opening 11 will be at approximately the same height as the upper surface of the upper slab 13. If the second wall 18 (waterproof wall 180) is not present, water will likely flow into the upper structure 10 through the opening 11. Even if the opening 11 is not an entrance (e.g., a window), if the lower end of the opening 11 is at a low position, water will likely flow into the upper structure 10 through the opening 11 if the second wall 18 (waterproof wall 180) is not present. Generally, a base-isolated building 1 is provided with a staircase connecting the base isolation pit 30 and the floor directly above it, so that flooding from the opening 11 leads to flooding of the base isolation pit 30. The second wall 18 is normally housed inside the first wall 16 as shown on the right side of FIG. 1, and during a flood, it moves above the first wall 16 as shown on the left side of FIG. 1 to form at least a part of the waterproof wall 180. Therefore, since the waterproof wall 180 is not present above the upper slab 13 under normal circumstances, horizontal access to the first floor of the superstructure 10, for example, to the opening 11, is not obstructed. For example, the superstructure 10 of the base-isolated building 1 may be used as a warehouse, in which case the height of the truck berth will be the upper slab 13 and the floor slab of the first floor.

[0027] The foundation structure 20 is a structure located below the superstructure 10 and constructed on the ground. The foundation structure 20 transmits the load of the superstructure 10 to the ground via a seismic isolation mechanism 22. A plurality of piles 26 (Figures 3 and 4) may be provided below the foundation structure 20, 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 onto the slab of the foundation structure 20 via a footing made of reinforced concrete. The foundation structure 20 has a retaining wall 23 that extends upward from the foundation structure 20.

[0028] A plurality of seismic isolation mechanisms 22 are provided for the seismically isolated building 1. The plurality of seismic isolation mechanisms 22 are installed at intervals at 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 mechanisms 22 are mechanisms that support the superstructure 10, reduce horizontal shaking caused by earthquakes or the like that is transmitted to the superstructure 10, and provide a force to restore the change in the relative position of the superstructure 10; they are so-called isolators. The seismic isolation mechanisms 22 are preferably laminated rubber or sliding bearings that cause little change in the vertical direction, and FIG. 1 shows an example in which the seismic isolation mechanism 22 is laminated rubber. The seismic isolation mechanism 22 may further include a damper that provides attenuation.

[0029] As shown in FIG. 2, in the base-isolated building 1, an upper slab 13 extends in a flange shape around the upper structure 10, and a first wall portion 16 and a second wall portion 18 extend along the outer periphery of the upper slab 13. The waterproof wall 180 is preferably formed by the continuous second wall portion 18. The waterproof wall 180 is a continuous wall that is higher than the upper slab 13, and in this embodiment, it completely surrounds the periphery of the upper structure 10. At a position higher than the upper slab 13, the waterproof wall formed by the second wall portion 18 Being surrounded by the wall 180 can reliably prevent water from entering the superstructure 10. Note that, if an existing wall or the like installed on the upper slab 13 can be integrated with the raised second wall portion 18 in a watertight manner, part of the waterproof wall 180 may be an existing wall or the like other than the second wall portion 18.

[0030] Furthermore, the base-isolated building 1 has a base isolation pit 30 surrounded by a continuous retaining wall 23 shown by a dashed line below the upper slab 13. Therefore, the first wall portion 16 and the retaining wall 23 can prevent water from flooding the base isolation pit 30 at a position lower than the upper slab 13.

[0031] 2. Retaining wall, first wall section and second wall section The retaining wall 23, the first wall portion 16, and the second wall portion 18 will be described with reference to Figures 1 to 4. Figure 3 is an enlarged cross-sectional view showing the part surrounded by the dashed line in Figure 1 during normal times, and Figure 4 is an enlarged cross-sectional view showing the part surrounded by the dashed line in Figure 1 during a flood.

[0032] As shown in Figures 1 and 2, the retaining wall 23 is provided to surround the periphery of 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 periphery of the foundation structure 20 and rises upward from the outer edge of the foundation structure 20, with the inside of the retaining wall 23 constituting 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 aligned to the height of the ground level GL.

[0033] 3 and 4, the upper end 23a of the retaining wall 23 is located higher than the lower end 16a of the first wall portion 16, and is disposed at a first distance L1 from the superstructure 10. By setting the upper end 23a of the retaining wall 23 at a position higher than the lower end 16a of the first wall portion 16 that surrounds the outside of the retaining wall 23, the air pressure within the seismic isolation pit 30 acts to prevent the water 50 from rising, preventing flooding beyond the retaining wall 23.

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

[0035] The first distance L1 is a vertical gap (direction 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 distance L1 enables the upper end 23a of the retaining wall 23 to remain out of contact with the superstructure 10 during relative horizontal movement of the retaining wall 23 with respect to the superstructure 10 due to an earthquake anticipated for the base-isolated building 1. The minimum value of the first distance L1 is set to, for example, about 50 mm.

[0036] The first wall portion 16 surrounds the outside of the retaining wall 23 and is disposed at a second distance L2 from the retaining wall. The second distance L2 between the first wall portion 16 and the retaining wall 23 is closed above by the upper slab 13. Therefore, the air pressure inside the space formed by the first wall portion 16 and the upper slab 13 causes the water level of the water 50 at the second distance L2 to barely rise. Since the first wall portion 16 surrounds the outside of the retaining wall 23 in this way, it is possible to prevent the water 50 from rising between the first wall portion 16 and the retaining wall 23 during a flood, thereby preventing flooding into the seismic isolation pit 30. The second distance L2 is, for example, the distance that the superstructure 10 is allowed to move horizontally relative to the foundation structure 20, and is set according to the earthquakes anticipated for the seismically isolated building 1.

[0037] The first wall portion 16 has a first flow path 16c through which water flows. The first flow path 16c is located, for example, below the second wall portion 18, and allows water to flow around the entire periphery of the first wall portion 16. The first flow path 16c may be configured to raise the second wall 18 by buoyancy by storing water below the second wall 18, or the lower end of the second wall 18 may be configured as a piston and the first flow path 16c may be configured as a cylinder to raise the second wall 18 by water pressure. The first flow path 16c communicates with the outside via the second flow path 16d through a water intake 16b that opens on the outer surface of the first wall 16. The water intake 16b preferably opens at a position lower than the height of the upper slab 13 so that it can take in water during a flood and store it in the first flow path 16c, and the opening area and opening height can be set taking into account the expected rate of water rise during a flood.

[0038] The first wall 16 may include a partition plate 16e that defines a first flow path 16c and a second flow path 16d therein. The partition plate 16e is provided to separate the inside (first flow path 16c) from the outside (second flow path 16d) of the first wall 16. The partition plate 16e has a through-hole 16f that connects the first flow path 16c and the second flow path 16d. The through-hole 16f is provided, for example, near the lower end 16a. A plurality of through-holes 16f may be provided, or a single hole extending along the lower end 16a may be provided. Water that flows into the second flow path 16d from the water intake 16b flows into the first flow path 16c through the through-hole 16f.

[0039] As shown in FIG. 3, the second wall 18 is normally housed within the first wall 16, with the upper surface of the second wall 18 flush with the upper surface of the upper slab 13. In this embodiment, the second wall 18 is housed between the inner wall of the first wall 16 and the partition plate 16e, above the first flow path 16c. The second wall 18 is housed at a height such that the lower end of the second wall 18 does not block the first flow path 16c and the through-hole 16f. During a flood, as shown in FIG. 4, the second wall 18 is pushed up by water flowing into the first flow path 16c from the outside. The second wall 18, pushed up by 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 depth of water inundation due to a flood or the like exceeds the height of the seismic isolation pit 30, the waterproof wall 180 prevents water from flowing into the opening 11 from the outside, thereby preventing water from inundating the seismic isolation pit 30 from an entrance (not shown) to the seismic isolation pit 30 provided in the superstructure 10. The waterproof wall 180 may surround the entire periphery of the superstructure 10 as shown in FIG. 2, or may be provided so as to surround the opening 11 between itself and the outer wall 12 as in Modification 3 (FIG. 10) described below. 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 material that is light enough to be pushed up by the water in the first flow path 16c. The second wall 18 has excellent waterproof 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 flow path 16c. The second wall 18 is preferably structured so that it can be pushed up by the water flowing in from the water intake 16b, but may also have a power source to assist the lifting of the second wall 18.

[0041] In recent years, river flooding caused by heavy rainfall due to abnormal weather has often exceeded expectations at the time of construction. Submergence of the seismic isolation pit 30 can impair the function of the seismic isolation mechanism 22 and can also deteriorate the seismic isolation mechanism 22. For this reason, drainage facilities are provided within the seismic isolation pit 30, but it is more preferable to employ the configuration of the present invention to prevent or suppress flooding into the seismic isolation pit 30.

[0042] 3.Waterproof rubber The watertight rubber 40 will be described with reference to Fig. 5. Fig. 5 is an enlarged cross-sectional view of the watertight rubber 40.

[0043] As shown in FIG. 5, the watertight rubber 40 is fixed around the entire periphery of the retaining wall 23 near the upper end 23a to prevent water from seeping in through the first gap L1.

[0044] The water-stop rubber 40 includes a fixed portion 40a that is fixed to the retaining wall 23 and a sealing portion 40c that protrudes from the fixed portion 40a. The fixed portion 40a is fixed to the outer surface of the retaining wall 23 near the upper end 23a with, for example, multiple bolts 40b. The sealing portion 40c has a height that closes the first interval L1. The sealing portion 40c can prevent water from flowing into the seismic isolation pit 30 from the outside by contacting the free end 40d of the sealing portion 40c with the smooth surface 13a. While the free end 40d is shown in contact with the smooth surface 13a in FIG. 5, the free end 40d does not need to be in contact with the smooth surface 13a under normal circumstances. In this case, the sealing portion 40c may be deformed by water pressure (indicated by the arrow) during a flood, causing the free end 40d to contact the smooth surface 13a.

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

[0046] In the case of a flood or the like where the water level rises gradually, the water will not rise between the first wall section 16 and the retaining wall 23, but if the water level suddenly rises on one side of the seismically isolated building 1, the water level may rise to the top of the retaining wall 23, in which case the water-stop rubber 40 can prevent water from entering the seismic isolation pit 30.

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

[0048] 4. Variation 1 A base-isolated building 1a according to Modification 1 will be described using Figures 6 to 8. Figure 6 is a cross-sectional view of the first wall 16 and the second wall 18 of the base-isolated building 1a according to Modification 1, Figure 7 is a plan view of the first wall 16 and the second wall 18 of the base-isolated building 1a according to Modification 1, and Figure 8 is a front view of the first wall 16 and the second wall 18 of the base-isolated building 1a according to Modification 1. Here, Figure 6 (a) shows the housed state, (b) shows the operating state, and (c) shows the fully closed state, Figure 7 shows the inside of each flow path with the lid 18a omitted, and Figure 8 shows the housed state on the left and the fully closed state on the right. Furthermore, the base-isolated building 1a according to Modification 1 has the same basic configuration as the base-isolated building 1 according to the above embodiment, so duplicated explanations will be omitted.

[0049] The first wall 16 shown in FIGS. 6 to 8 includes a wire 62 (shown by a broken line) having one end fixed to the second wall 18, a pulley 61 fixed to the first wall 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 surface of the partition plate 16e facing the second flow path 16d. One end of the wire 62 is fixed, for example, to the lower end of the second wall 18. The wire 62 passes from the pulley 61 through a hole in the partition plate 16e and is fixed to the second wall 18 near the roller 65, and the weight of the counterweight 60 constantly acts as an upward force on the second wall 18. The counterweight 60 is housed inside the first wall 16, for example, in the second flow path 16d. By storing the counterweight 60 inside the first wall portion 16, the second wall portion 18, etc., including the counterweight 60, can be assembled together as the first wall portion 16 assembly in a factory, and this assembly can be transported to the construction site and installed, facilitating construction. Also, storing the counterweight 60 inside the first wall portion 16 prevents the counterweight 60 from swinging due to the flow of water 50 caused by a flood. The first wall portion 16 and the second wall portion 18, etc., may also be assembled at the construction site.

[0050] 6(a), when the second wall portion 18 is housed within the first wall portion 16, a through-hole 16f and a water intake 16b are formed at a position lower than the second wall portion 18. A 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) and also functions as a stopper that determines the lowering 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 in the vertical direction on the surface of the partition plate 16e facing the first flow path 16c to guide the vertical movement of the second wall portion 18.

[0051] As shown in Figures 6 to 8, the second wall portion 18 has a lower seal 67 fixed along the lower edge of the second wall portion 18 and at least one pair of side seals 68 fixed vertically to both left and right ends of the second wall portion 18. The lower seal 67 and the side seals 68 contact the inner surface of the first wall portion 16 on the retaining wall 23 side (Figures 3 and 4) side, preventing water from entering between the first wall portion 16 and the inner surface of the first wall portion 16. The base-isolated building 1a may further include multiple guide plates 64 spaced apart around the periphery of the superstructure 10. The guide plates 64 are positioned to extend vertically from the upper end of the first wall portion 16 or the outer edge of the upper slab 13 so as to contact the side seals 68 when the second wall portion 18 is raised. The provision of multiple guide plates 64 allows the waterproof wall 180 to be formed using a short second wall portion 18, making the second wall portion 18 easier to handle and improving construction workability. The second wall portion 18 rises and comes into watertight contact with the guide plate 64, forming a continuous waterproof wall 180. Therefore, as shown in FIGS. 6(b) and 6(c), water 50 does not penetrate inside 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 the second wall portion 18 is raised above the upper slab 13, preventing it from tipping over toward the upper slab 13. The guide plate 64 is preferably made of a material with excellent waterproofing, such as metal. A plurality of guide plates 64 are provided at intervals along the inner periphery of the upper end of the first wall portion 16 (the outer periphery of the upper slab 13). The guide plates 64 may be provided on a straight portion in the X direction as shown in FIG. 7, or on a corner between the X direction and the Y direction.

[0052] As shown in FIGS. 7 and 8, the second wall 18 may be formed by connecting multiple hollow members 18b and extending horizontally. In the example of FIG. 7, multiple hollow members 18b extend in the X direction to form a single second wall 18, and at the bottom of the figure, hollow members 18b and second walls 18 are also arranged in the Y direction. The waterproof wall 180 is formed by the raised second wall 18, with both ends of the second wall 18 contacting adjacent guide plates 64, 64 to form a continuous structure. That is, the guide plates 64 fill the gaps between adjacent second walls 18, thereby ensuring waterproofing. The hollow members 18b are made of a lightweight metal (e.g., aluminum) with an air layer inside, and adjacent hollow members 18b are connected to each other in a watertight seal. The second wall 18 is formed by connecting multiple hollow members 18b to each other. Adjacent second walls 18 may be connected to each other, or may be independent, as in this example. The side seals 68 on both the left and right ends of the second wall portion 18 come into contact with the guide plates 64, thereby preventing water from seeping into the upper slab 13 between adjacent second wall portions 18. Furthermore, when adjacent second wall portions 18 are connected to each other, a continuous waterproof wall 180 can be formed that surrounds the periphery of the superstructure 10, as in the above embodiment.

[0053] Next, the operation of the second wall 18 will be described using Figures 6(a) to 6(c). As shown in Figure 6(a), in the stored state, the counterweight 60 is lighter than the second wall 18, so the second wall 18 can be maintained stored within the first wall 16, and the cover 18a closes the opening at the top end of the first wall 16, maintaining the second wall 18 completely stored inside the first wall 16. During a flood, as shown in Figure 6(b), water 50 flowing from the intake 16b into the second flow path 16d flows through the through-hole 16f into the first flow path 16c, and the buoyancy of the water 50 and the weight of the counterweight 60 push up the second wall 18. At this time, the lower seal 67 and the side seal 68 are pressed against the inner surface of the first wall 16, so the water 50 does not flow into the upper slab 13 side of the second wall 18. The degree of buoyancy that causes the second wall 18 to rise is determined by the amount of buoyancy. This 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 lowering limit inside the second flow path 16d, and the second wall 18 rises to its upper limit. When the flood is resolved, the water 50 in the second flow path 16d is drained, causing the buoyancy of the second wall 18 to disappear, and the difference in weight between the second wall 18 and the counterweight 60 causes the container to return to the stored state of (a).

[0054] 5. Variation 2 The base-isolated building 1b according to Modification 2 will be described in detail using Fig. 9. Fig. 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 duplicated explanations will be omitted.

[0055] The base-isolated building 1b shown in Figure 9 differs from the base-isolated building 1 in that, in plan view, guide plates 64 are provided at each corner of the waterproof wall 180. The waterproof wall 180 surrounds the entire periphery of the superstructure 10. The waterproof wall 180 includes four second wall portions 18 that extend linearly in the X and Y directions, and four guide plates 64 provided at each corner. By providing the guide plates 64 at the corners, the second wall portions 18 become linear, simplifying the structure, reducing the unit cost of the second wall portions 18, and improving workability.

[0056] The second wall portion 18 may be formed by connecting a plurality of hollow members 18b as in Modification 1. In addition, although the upper structure 10 in Fig. 9 is rectangular in plan view, the upper structure 10 may be more complex, for example, L-shaped or U-shaped, and in that case too, the straight portions may be second wall portions 18 and the corners may be guide plates 64, thereby enabling the use of common parts.

[0057] 6. Variation 3 The base-isolated building 1c according to the modified example 3 will be described in detail using Figures 10 and 11. Figure 10 is a plan view of the base-isolated building 1c according to the modified example 3, and Figure 11 is a cross-sectional view of the water-stop rubber according to the modified example 3. The base-isolated building 1c according to the modified example 3 has the same basic configuration as the base-isolated building 1 according to the above embodiment, so duplicated explanations will be omitted.

[0058] The base-isolated building 1c shown in FIG. 10 has an opening 11a on one side of the exterior wall 12 of the superstructure 10. If the base-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 no entrances or exits may be provided on the other sides of the exterior wall 12. In such a base-isolated building 1c, it is efficient to provide a waterproof wall 180 only at the location corresponding to the opening 11a. Note that there does not have to be only one opening 11a; multiple independent waterproof walls 180 may be provided corresponding to the surfaces of the exterior wall 12 corresponding to each opening 11a.

[0059] The base-isolated building 1c includes two guide plates 64 spaced apart around the periphery of the superstructure 10. The waterproof wall 180 is continuous with the second wall portion 18, which is pushed up between the adjacent guide plates 64. The two guide plates 64 are connected to the exterior wall 12 of the superstructure 10. One end of the guide plate 64 is watertightly fixed to the exterior 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 portion 18. The exterior wall 12, which does not have an opening 11a, is constructed with highly waterproof building materials at least up to the height of the raised second wall portion 18. Examples of such building materials include sandwich panels. The exterior wall 12 and the guide plates 64 are integrated, preventing water from seeping in from their connection. The guide plates 64 are L-shaped in plan view, but may have other shapes depending on the connection position with the exterior wall 12 and the contact state with the second wall portion 18.

[0060] Unlike the water-stop rubber 40 shown in FIG. 5, the water-stop rubber 40 shown in FIG. 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 water-stop 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, for example, metal and is more flexible than the watertight rubber 40. By providing the leaf spring 42, the watertight rubber 40 can be brought into sufficient contact with the smooth surface 13a even if, for example, there is a large construction error in the first gap L1 or if there is a change due to operation.

[0061] In addition, in the base-isolated building 1c, a stainless steel plate 13b is fixed to the underside of the upper slab 13, and the underside of the stainless steel plate 13b forms the 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-stopping properties (flatness) for the water-stop rubber 40. The leaf spring 42 and stainless steel plate 13b in Fig. 11 may be applied to the above embodiment and the above modified example.

[0062] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the present invention includes configurations that are substantially the same as 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 achieve the same effects or purposes as the configurations described in the embodiments. The present invention also includes configurations in which publicly known technology is added to the configurations described in the embodiments. [Explanation of symbols]

[0063] 1, 1a, 1b, 1c... seismic isolated building, 10... upper structure, 11, 11a... opening, 12... exterior wall, 13... upper slab, 13a... smooth surface, 13b... stainless steel plate, 16... first wall portion, 16a... lower end, 16b... water intake, 16c... first flow path, 16d... second flow path, 16e... partition plate, 16f... through hole, 18... second wall portion, 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...waterstop rubber, 40a...fixed 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...bottom seal, 68...side seal, L1...first interval, L2...second interval

Claims

1. The system comprises a foundation structure, a plurality of seismic isolation mechanisms installed in seismic isolation pits of the foundation structure, and an upper structure supported by the plurality of seismic isolation mechanisms, the foundation structure includes a retaining wall extending upwardly from the foundation structure; the upper structure includes a first wall portion extending downward from the upper structure, a second wall portion accommodated inside the first wall portion, and an opening portion that opens at a position higher than an upper end of the first wall portion, the retaining wall is provided so as to surround the periphery of the seismic isolation pit, and an upper end of the retaining wall is located higher than a lower end of the first wall portion and is disposed at a distance from the superstructure; the first wall portion surrounds the outside of the retaining wall, is disposed at a distance from the retaining wall, and has a flow path through which water flows, the flow path directly connects the outside and the inside via a water intake that opens on an outer surface of the first wall portion and is directly open to the outside, and is configured so that water flows from the water intake to below the second wall portion; A seismically isolated building, characterized in that the second wall portion pushed up by 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 of the upper structure from the outside.

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

3. In claim 1, The base-isolated building further includes a plurality of guide plates arranged at intervals around the periphery of the superstructure, A seismically isolated building, characterized in that the waterproof wall is continuous in the circumferential direction of the superstructure, with both ends of the pushed-up second wall portion in contact with the adjacent guide plates.

4. In claim 3, A seismically isolated building, wherein 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, A seismically isolated building, characterized in that the waterproof wall surrounds the entire periphery of the superstructure.

6. In any one of claims 1 to 5, The retaining wall further includes a water-stop rubber fixed along the upper edge, the upper structure has a smooth surface facing the water-stop rubber, The water-stop rubber includes a fixing portion fixed to the retaining wall and a sealing portion protruding from the fixing portion, A seismically isolated building, characterized in that the sealing portion prevents water from flowing into the seismic isolation pit from the outside by contacting the free end of the sealing portion with the smooth surface.

7. In any one of claims 1 to 6, 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 is accommodated in the interior of the first wall portion. Earthquake building.

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