Anti-flooding mechanism for seismic isolation layer

Abstract

To provide a water immersion suppression mechanism of a base isolation layer capable of suppressing water immersion into the base isolation layer SOLUTION: The inundation suppression mechanism of the base isolation layer includes a retaining wall 22 surrounding the base isolation layer supporting a building 10, an inundation groove 30 provided in the retaining wall 22 so as to protrude to the building 10 side, and an expansion joint 40 provided over the building 10 and the retaining wall 22 so as to cover the upper part of the inundation groove 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a water infiltration prevention mechanism for a seismic isolation layer. [Background technology]

[0002] The following Patent Document 1 describes the configuration of a water stop device that prevents water that has flowed into the seismic isolation layer through gaps in expansion joints from flowing further into the underground space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-175220 Summary of the Invention [Problem to be solved by the invention]

[0004] The water stop device in Patent Document 1 prevents water from seeping into the underground space from the seismic isolation layer. However, in addition to this water seepage prevention mechanism, there is a need for a water seepage prevention mechanism that can prevent water from seeping into the seismic isolation layer itself during floods.

[0005] In consideration of the above, the present invention aims to provide a water infiltration suppression mechanism for a seismic isolation layer that can suppress water infiltration into the seismic isolation layer. [Means for solving the problem]

[0006] The water ingress prevention mechanism of the seismic isolation layer of claim 1 comprises a retaining wall surrounding the seismic isolation layer supporting the building, a water ingress groove provided in the retaining wall so as to protrude toward the building, and an expansion joint provided between the building and the retaining wall so as to cover the upper part of the water ingress groove.

[0007] In the seismic isolation layer flooding prevention mechanism of claim 1, water that flows between the retaining wall and the expansion joint during a tsunami or other event is stored in a flooding groove provided in the retaining wall, thereby preventing flooding into the seismic isolation layer.

[0008] The water ingress prevention mechanism for the seismic isolation layer of claim 2 is the water ingress prevention mechanism for the seismic isolation layer of claim 1, in which the building is provided with an outer perimeter slab that protrudes above the water ingress groove to form a seismic isolation clearance between it and the retaining wall, and the upper surface of the groove wall on the building side of the water ingress groove is provided with a water-expanding water-stopping material that swells when it absorbs water and is adhered to the outer perimeter slab.

[0009] In the water ingress prevention mechanism of the seismic isolation layer of claim 2, when the water level in the water ingress groove increases, the water-expandable water-stop material expands due to the water overflowing from the water ingress groove. The expanded water-expandable water-stop material then seals off the water between the groove wall and the building's outer perimeter slab. This prevents the water accumulated in the water ingress groove from overflowing into the seismic isolation layer.

[0010] The water ingress prevention mechanism for the seismic isolation layer of claim 3 is the water ingress prevention mechanism for the seismic isolation layer of claim 2, in which the water-expanding water-stopping material is applied to a bellows-shaped mesh member connected to the upper surface of the groove wall and the outer peripheral slab.

[0011] In the water infiltration suppression mechanism of the seismic isolation layer of claim 3, the water-expanding water-stop material is applied to the bellows-shaped mesh member, so it expands and contracts along with the bellows-shaped mesh member. This makes it difficult for the water-stop performance to deteriorate even if the building and the retaining wall are displaced relative to each other.

[0012] The water ingress prevention mechanism for the seismic isolation layer of claim 4 is the water ingress prevention mechanism for the seismic isolation layer of claim 2, in which the water-expandable water-stopping material is applied to the upper surface of the groove wall and to water-stopping plates protruding alternately from the outer peripheral slab.

[0013] In the water infiltration suppression mechanism of the seismic isolation layer of claim 4, the water infiltration path is made into a maze by the waterstop plates, thereby improving water stopping performance.

[0014] The water inundation suppression mechanism for the seismic isolation layer of claim 5 is the water inundation suppression mechanism for the seismic isolation layer of claim 1, in which a drainage channel is formed on the bottom or side of the water inundation groove to discharge water from the water inundation groove to a water tank or an external drainage mechanism.

[0015] The water ingress prevention mechanism of the seismic isolation layer of claim 5 can prevent water from overflowing from the water ingress groove and prevent water from entering the building.

[0016] In addition, the water inundation suppression mechanism of the seismic isolation layer of claim 5 may be a water inundation suppression mechanism of the seismic isolation layer described in any one of claims 1 to 4, in which a drainage channel is formed on the bottom or side of the water inundation groove to discharge water from the water inundation groove to a water tank or an external drainage mechanism. [Effects of the Invention]

[0017] According to the present invention, it is possible to suppress water infiltration into the seismic isolation layer. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a cross-sectional view partially showing a building to which a seismic isolation layer flood suppression mechanism according to an embodiment of the present invention is applied. [Figure 2] (A) is a cross-sectional view showing an expansion joint in which a flood barrier plate, which is an example of a water inundation suppression mechanism for a seismic isolation layer in an embodiment of the present invention, is placed, and (B) is a cross-sectional view showing a state in which the building and the retaining wall have been displaced relative to each other. [Figure 3] FIG. 10 is a cross-sectional view showing the state in which the tide barrier is erected. [Figure 4] (A) is an elevation view showing a flood barrier with a plastic hinge, and (B) is an elevation view showing a flood barrier with a hinge-like hinge. [Figure 5] A cross-sectional view showing an expansion joint in which a water-expanding water-stopping material is arranged, which is an example of a water infiltration suppression mechanism of a seismic isolation layer in an embodiment of the present invention. [Figure 6] (A) is a cross-sectional view showing the water-expandable water-stopping material and case, (B) is a cross-sectional view showing the state where the water level between the retaining wall and the expansion joint is low, (C) is a cross-sectional view showing the state where the water level between the retaining wall and the expansion joint is high, and (D) is a cross-sectional view of line DD in (A). [Figure 7](A) A cross-sectional view showing the state in which water has accumulated in a flooding groove, which is an example of a flooding prevention mechanism for a seismic isolation layer in an embodiment of the present invention, (B) a cross-sectional view showing the state in which a water-expandable water-stopping material has expanded, and (C) a cross-sectional view showing the state in which the water in the flooding groove has been drained into a water tank. [Figure 8] (A) is a cross-sectional view showing the state in which a water-expandable water-stopping material has been applied to a bellows-shaped mesh member, and (B) is a cross-sectional view showing the state in which the building and retaining wall have been displaced relative to each other when water has accumulated in the flooding trench. [Figure 9] FIG. 1 is a cross-sectional view showing a state in which a water-swellable waterstop material is applied to a waterstop plate. [Figure 10] 10 is a cross-sectional view showing the state in which a water sealing wall to be inserted into a water ingress groove has been formed. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] The following describes a water ingress prevention mechanism for a seismic isolation layer according to an embodiment of the present invention, with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and multiple components may exist.

[0020] Furthermore, descriptions of overlapping configurations and symbols in each drawing may be omitted. Note that the present disclosure is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting configurations, replacing them with different configurations, or combining one embodiment with various modified examples, within the scope of the purpose of the present disclosure.

[0021] <Building> 1 partially illustrates a building 10 to which the seismic isolation layer flood suppression mechanism of the present invention is applied. The building 10 is a seismically isolated building with a basement floor, and a seismic isolation layer 10V is formed between the building 10 and a foundation floor slab 20.

[0022] A plurality of seismic isolation devices 12 are arranged on the upper surface of the foundation floor slab 20, and these seismic isolation devices 12 support the building 10. The seismic isolation layer 10V is the space between the foundation floor slab 20 and the building 10, and refers to the space in which the seismic isolation devices 12 are arranged.

[0023] A retaining wall 22 is connected to the foundation slab 20. The retaining wall 22 is an earth retaining wall formed to surround the building 10 and the seismic isolation layer 10V. In addition, an offset wall 24 is arranged between the retaining wall 22 and the building 10.

[0024] The offset wall 24 is a wall disposed closer to the building 10 than the retaining wall 22, and is disposed inside the retaining wall 22 to surround the building 10. The offset wall 24 is also connected to the foundation slab 20, similar to the retaining wall 22. The height of the offset wall 24 is lower than the height of the retaining wall 22.

[0025] The retaining wall 22 and the offset wall 24 are connected by a connecting slab 26. The connecting slab 26 is a plate-like structure that spans horizontally between the retaining wall 22 and the offset wall 24. The connecting slab 26 is formed at a position lower than the upper end surface of the offset wall 24. The retaining wall 22, the offset wall 24, and the connecting slab 26 form a flood groove 30, which serves as a flood drainage mechanism, as will be described later.

[0026] (Seismic isolation clearance) The offset wall 24 and the building 10 are arranged to be spaced apart in the horizontal direction. This distance L1 functions as a seismic isolation clearance when the building 10 is displaced relative to the foundation floor slab 20.

[0027] Additionally, the perimeter of the building 10 is provided with an offset wall 24 and a perimeter slab 14 that protrudes above the flood trench 30. The perimeter slab 14 and the retaining wall 22 are spaced apart horizontally. This distance L2 also functions as a seismic isolation clearance when the building 10 is displaced relative to the foundation floor slab 20.

[0028] (Expansion joint) As shown in Figure 2(A), an expansion joint 40 is provided in the gap between the outer perimeter slab 14 and the retaining wall 22. The expansion joint 40 is provided so as to span the seismic isolation clearance between the retaining wall 22 and the building 10 and cover the upper part of the flood trench 30.

[0029] The configuration of the expansion joint 40 is not particularly limited, but as an example, one end of the expansion joint 40 is fixed to the building 10 (periphery slab 14) (fixed portion 42). The other end of the expansion joint 40 rests on the retaining wall 22. When the building 10 and the retaining wall 22 are displaced relative to each other during an earthquake or the like, the expansion joint 40 slides on the retaining wall 22.

[0030] Furthermore, as shown in Figure 2(B), when the building 10 and the retaining wall 22 are displaced in a direction that brings them closer to each other and the displacement is large, the expansion joint 40 can rotate around the fixed part 42 and climb up onto the step 22A provided on the retaining wall 22.

[0031] <Flood control mechanism> (Tide embankment) A flood barrier plate 50 is provided in the expansion joint 40 as a flood prevention mechanism. The flood barrier plate 50 is laid down and placed on top of the expansion joint 40, and in the event of a tsunami or flood, it rises toward the retaining wall 22 and functions as a flood barrier, as shown in Figure 3.

[0032] The flood barrier plate 50 stands up by rotating around a hinge 52 provided on the retaining wall 22 side of the expansion joint 40. Furthermore, stays 54 are provided on the flood barrier plate 50 so that the flood barrier plate 50 will not be pushed down by pressure P when it is subjected to pressure P due to a tsunami or the like while in an upright position.

[0033] There are no particular limitations on the structures of the flood barrier plate 50 and the hinge 52. For example, the flood barrier plate 50A shown in Fig. 4(A) is formed by bending a single plate, with one side used as a flood barrier, and the other side fixed to the expansion joint 40. The hinge 52A is formed by bending a single plate, with the fold line portion becoming a plastic hinge.

[0034] For example, the flood barrier 50B shown in Figure 4(B) is formed in a hinged shape, with one side used as a flood barrier and the other side fixed to the expansion joint 40. The hinge 52B is formed by a pipe formed at the joint of each side and a pin inserted into the pipe.

[0035] (Start-up organization) The flood suppression mechanism has a raising mechanism that can raise the flood barrier 50 in response to a prediction of a tsunami approaching the building 10 or a prediction of flooding of the building 10.

[0036] As shown in Fig. 3, the startup mechanism includes a control device 56. The control device 56 includes a CPU (Central Processing Unit: Processor). The CPU of the control device 56 acquires tsunami warnings and flood warnings issued by organizations such as the Japan Meteorological Agency. The CPU of the control device 56 determines whether the warnings have been issued for the area in which the building 10 is located.

[0037] As an example, if the warning is issued for the area in which the building 10 is located, the CPU of the control device 56 drives the stay 54 to automatically raise the flood protection panel 50. The mechanism for raising the flood protection panel 50 may be incorporated into the hinge 52.

[0038] As another example, if the alert is issued for the area in which building 10 is located, the CPU of control device 56 notifies the control room or the like of building 10 of the alert. In this case, a caretaker or the like stationed in the control room can manually raise flood barrier 50.

[0039] (Water-expanding water-stop material for expansion joints) As a flood prevention mechanism, a water-swellable water-stop material 60 shown in FIG. 5 may be used "in addition to" or "instead of" the raising mechanism including the above-mentioned tide barrier plate 50 and control device 56.

[0040] The water-swellable water-stop material 60 is a sealing material that is provided on the back surface of the expansion joint 40 on the retaining wall 22 side, and swells when it absorbs water, sealing the clearance between the upper surface of the retaining wall 22 and the back surface of the expansion joint 40. This water-swellable water-stop material 60 is adhered to the back surface of the expansion joint 40, and swells when it absorbs water, adhering to the retaining wall 22.

[0041] As such, the water-swelling waterproof material 60 may be a waterproof material containing a hydrophilic urethane resin as a main component, or a vulcanized rubber-based water-swelling sealing material containing chloroprene synthetic rubber as a main component.

[0042] 6(A) to 6(C), the water-swellable water-stopping material 60 can be housed in a case 62. The case 62 has the function of keeping the water-swellable water-stopping material 60 floating above the retaining wall 22, and also of allowing the water-swellable water-stopping material 60 to be submerged in water when the water level is equal to or greater than a predetermined level.

[0043] Specifically, the case 62 is fixed to the back surface of the expansion joint 40, and holds the water-swellable water-stop material 60 between the case 62 and the expansion joint 40. As shown in FIG. 4(D), openings 62A are formed in the bottom and side surfaces of the case 62 that face the retaining wall 22.

[0044] As shown in Figure 6(B), if the water level H1 when rainwater or the like penetrates between the upper surface of the retaining wall 22 and the expansion joint 40 is less than the thickness of the case 62, the water-expandable water-stopping material 60 is less likely to come into contact with water and to expand.

[0045] On the other hand, as shown in Figure 6(C), a large amount of water may seep in between the retaining wall 22 and the expansion joint 40 due to a tsunami, flood, or the like, causing the water level H2 to exceed the thickness of the case 62. In such a case, the water-swellable water-stop material 60 absorbs water, expands, and is adhered to the retaining wall 22. This allows the water to be sealed between the retaining wall 22 and the expansion joint 40.

[0046] (flood trenches, tanks, drainage channels) As shown in Figure 1, the retaining wall 22 has a flood groove 30 formed therein, with the retaining wall 22 and the offset wall 24 as the groove walls and the connecting slab 26 as the groove bottom. The flood groove 30 is a groove provided in the retaining wall 22 that protrudes toward the building 10.

[0047] In addition, a water tank 32 is formed below the connecting slab 26 and is surrounded by the foundation floor slab 20, retaining wall 22, offset wall 24, and connecting slab 26. A drainage channel 34 that connects the submergence trench 30 and the water tank 32 is formed in the connecting slab 26, which forms the bottom surface of the submergence trench 30.

[0048] The drainage channel 34 is a pipe that discharges water from the flooding ditch 30 into the water tank 32, and is equipped with a valve that opens when the water level in the flooding ditch 30 reaches a predetermined level or more. However, the configuration of the drainage channel 34 is not particularly limited, and it may be an overflow pipe or the like that has one end opening into the side surface of the flooding ditch 30 (i.e., the wall surface of the retaining wall 22 or offset wall 24 facing the flooding ditch 30).

[0049] (Water-expandable waterproofing material for trench walls) 2, a water-swellable waterstop material 70 is applied to the upper surface of the wall of the flood trench 30 on the building 10 side (i.e., the upper surface of the offset wall 24) so ​​as to swell when it absorbs water and to be adhered to the back surface of the outer perimeter slab 14. The water-swellable waterstop material 70 is made of the same material as the water-swellable waterstop material 60.

[0050] As shown in FIG. 8(A), the water-swellable water-stop material 70 may be applied to a bellows-shaped mesh member 72 connected to the upper surface of the offset wall 24, which is a groove wall, and the outer periphery slab 14.

[0051] For example, as shown in Figure 8(B), when the building 10 and the retaining wall 22 are displaced relative to each other during an earthquake or aftershock, the mesh member 72 expands and contracts. Therefore, the mesh member 72 is less likely to hinder the movement of the seismic isolation device 12 in the seismic isolation layer 10V. Furthermore, because the water-expandable water-stop material 70 is applied to the mesh member 72, it expands and contracts in accordance with the mesh member 72. This makes it less likely that the water-stop performance will be reduced even if the building 10 and the retaining wall 22 are displaced relative to each other.

[0052] 9(A), the water-swelling waterstop material 70 may be applied to the upper surface of the offset wall 24, which is a groove wall, and to waterstop plates 74 that protrude alternately from the outer perimeter slab. According to this embodiment, the waterstop plates 74 form a maze of water paths that could lead to the seismic isolation layer 10V shown in FIG. 1, thereby improving waterstop performance.

[0053] (Water seal wall) As shown in Fig. 10, a water sealing wall 16 may be formed at the tip of the outer perimeter slab 14. The water sealing wall 16 is used in combination with a water-swellable water-stop material 70. The water sealing wall 16 is provided along the water ingress groove 30 and is a hanging wall inserted into the water ingress groove 30.

[0054] When water is accumulated in the waterlogging groove 30 and the water-expandable water-stop material 70 expands and adheres to the back surface of the outer periphery slab 14, an air pocket 16V is formed in the area surrounded by the water-expandable water-stop material 70, the outer periphery slab 14, the water sealing wall 16 and the waterlogging.

[0055] The pressure of this air reservoir 16V makes it difficult for the water stored in the water ingress groove 30 to move toward the water-swelling water-stop material 70 (i.e., toward the seismic isolation layer 10V). Therefore, if the water sealing wall 16 is used in combination with the water-swelling water-stop material 70, the water-stop performance can be further improved.

[0056] <Action and effect> (Effect of flood barrier) In the flood suppression mechanism for the seismic isolation layer according to the embodiment of the present invention, as shown in Figure 2, the flood protection panels 50 are laid on top of each other on the expansion joints 40. This makes it less likely to hinder evacuation during an earthquake.

[0057] 3, the flood protection panel 50 is raised toward the retaining wall 22 rather than toward the building 10 to form a flood barrier. This prevents water from flowing over the expansion joints 40 during a tsunami or flood after an earthquake. This prevents water from flowing into the seismic isolation layer 10V shown in FIG. 1 through gaps around the expansion joints 40 or between the expansion joints 40.

[0058] Furthermore, the flood barrier 50 stands up by rotating around a hinge 52 provided on the retaining wall 22 side of the expansion joint 40. This makes it easier to erect the flood barrier 50 compared to a configuration that does not have a hinge as a rotation mechanism, for example a configuration in which the flood barrier 50 stands up by sliding up and down.

[0059] In addition, the flood prevention mechanism of the seismic isolation layer in the above embodiment has a raising mechanism (control device 56) that automatically raises the flood barrier 50 in response to a prediction of a tsunami arriving at the building 10 or a prediction of flooding of the building 10.

[0060] By automatically raising the tide barrier 50, it is easier to prevent secondary damage to the building 10 caused by a tsunami after an earthquake, compared to when the tide barrier 50 is raised manually.

[0061] On the other hand, the control device 56 may also be configured to issue a tsunami warning or the like to a control room or the like of the building 10. In this case, a caretaker or the like stationed in the control room can manually raise the tide barrier 50. According to this embodiment, the raising of the tide barrier 50 can be performed while visually checking it.

[0062] (Effect of water-expanding water-stopping material) Furthermore, in the water infiltration suppression mechanism of the base isolation layer according to the above embodiment, as shown in FIG. 6, a water-expandable water-stop material 60 that absorbs water and expands is provided on the back surface of the expansion joint 40.

[0063] Therefore, the water-swelling water-stop material 60 seals the space between the upper surface of the retaining wall 22 and the expansion joint 40. This prevents water from flowing into the seismic isolation layer from between the upper surface of the retaining wall 22 and the expansion joint 40.

[0064] Furthermore, the water-swellable water-stop material 60 is adhered to the back surface of the expansion joint 40, and when it absorbs water, it swells and is adhered to the retaining wall 22. In other words, when the water-swellable water-stop material 60 has not absorbed water, it is not adhered to the retaining wall 22. This makes it less likely that the water-swellable water-stop material 60 will hinder the movement of the expansion joint 40 during an earthquake before a tsunami.

[0065] Furthermore, the water-swellable waterstop material 60 is housed in a case 62, and is submerged in water when the water level is equal to or greater than a predetermined level. In other words, the water-swellable waterstop material 60 is not submerged when the water level is less than a predetermined level. This makes it possible to prevent the water-swellable waterstop material 60 from adhering to the retaining wall during times such as rainfall when the amount of water is less than during times such as tsunamis.

[0066] (Effect of flood trenches) In the water inundation suppression mechanism of the seismic isolation layer according to the above embodiment, the retaining wall 22 is provided with a water inundation groove 30 that protrudes toward the building 10 side.

[0067] As a result, if water flows between the retaining wall 22 and the expansion joint 40 during a tsunami or the like, the flowing water is stored in the flooding groove 30, as shown in Figure 7(A). This makes it possible to prevent water from flooding the seismic isolation layer 10V shown in Figure 1.

[0068] As shown in FIG. 7(B), the upper surface of the offset wall 24 is provided with a water-swellable waterproofing material 70 that swells when it absorbs water and is adhered to the rear surface of the outer perimeter slab 14.

[0069] As a result, when the water level in the flood trench 30 increases, the water-expandable waterstop material 70 expands due to the water overflowing from the flood trench 30. Also, when an earthquake occurs while water is accumulated in the flood trench 30 and the retaining wall 22 and the building 10 are displaced relative to each other, the water-expandable waterstop material 70 expands due to the water overflowing from the flood trench 30.

[0070] The expanded water-swelling water-stop material 70 then seals off the water between the offset wall 24 and the outer perimeter slab 14. This prevents the water accumulated in the water ingress groove 30 from overflowing into the seismic isolation layer 10V shown in FIG.

[0071] 7(C), a drainage channel 34 is formed on the bottom or side of the flooding trench 30 to drain the water in the flooding trench 30 into the water tank 32. This prevents water from overflowing from the flooding trench 30 and prevents water from entering the building 10.

[0072] <Other embodiments> In the above embodiment, the water-swellable water-stop material 70 is applied to the upper surface of the offset wall 24, but the present invention is not limited to this. Even if the water-swellable water-stop material 70 is omitted, water infiltration into the seismic isolation layer 10V can be suppressed by providing the water infiltration groove 30.

[0073] In the above embodiment, the drainage channel 34 discharges the water in the flooding ditch 30 into the water tank 32, but the present invention is not limited to this embodiment. The drainage channel 34 may be connected to an external drainage mechanism such as a public reservoir. In this case, the water tank 32 may be omitted. Alternatively, the capacity of the flooding ditch 30 may be increased.

[0074] Furthermore, in the above embodiment, the expansion joint 40 is provided with at least one of the tide barrier plate 50 and the water-swellable water-stop material 60 as a water infiltration suppression mechanism, but the embodiment of the present invention is not limited to this. In the present invention, both the tide barrier plate 50 and the water-swellable water-stop material 60 as water infiltration suppression mechanisms can be omitted. Even if both the tide barrier plate 50 and the water-swellable water-stop material 60 are omitted, the provision of the water infiltration groove 30 can prevent water from infiltrating into the seismic isolation layer 10V. Thus, the present invention can be implemented in various ways. [Explanation of symbols]

[0075] 10 Building 10V Seismic isolation layer 14 Periphery slab 22 Retaining Wall 30 Floodway 32 Aquarium 34 Drainage Channel 40 Expansion joint 70 Water-swelling waterproofing material 72 Net components 74 Waterstop

Claims

1. A retaining wall that surrounds the seismic isolation layer that supports the building; A flooding groove provided on the retaining wall so as to protrude toward the building; An expansion joint provided between the building and the retaining wall so as to cover the upper part of the flooding trench; A water infiltration prevention mechanism for the seismic isolation layer.

2. The building is provided with a perimeter slab that projects above the flood trench and forms a seismic isolation clearance between the perimeter slab and the retaining wall, A water-expandable water-stop material is provided on the upper surface of the building-side groove wall of the flood groove, which expands when it absorbs water and is adhered to the outer perimeter slab. The water ingress prevention mechanism according to claim 1 .

3. The water-swellable water-stopping material is The groove wall is coated on a bellows-shaped mesh member connected to the upper surface of the groove wall and the outer peripheral slab. The water infiltration suppression mechanism for the seismic isolation layer according to claim 2.

4. The water-swellable water-stopping material is The water infiltration suppression mechanism of claim 2, wherein the mechanism is applied to the upper surface of the groove wall and to waterstop plates that protrude alternately from the outer periphery slab.

5. A drainage channel is formed on the bottom or side of the flooding groove to discharge water from the flooding groove to a water tank or an external drainage mechanism. The water infiltration suppression mechanism for the seismic isolation layer according to claim 1.

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