Panel for quake isolation expansion joint

Abstract

To provide a panel for a quake isolation expansion joint capable of preventing water stains from appearing on a finished layer.SOLUTION: A panel for a quake isolation expansion joint is provided with a box-like main panel, a substrate layer and a finished layer laminated in the main panel, wherein an edge of the main panel is rotatably fixed, the main panel has a shape corresponding to a height of a step arranged on an opposite side and is mounted on the step by covering a quake isolation clearance as well as has a length enough to keep a mounted state on the step when the quake isolation clearance opens to an estimated maximum length, and further the panel for the quake isolation expansion joint is configured to surmount the opposite step by rotating upward around the edge as a center in a process to close the quake isolation clearance to an estimated minimum length. The main panel is provided with a plurality of drain holes, and opening ratio of the main panel with the plurality of drain holes is 5 to 90%.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a panel used in a seismic isolation expansion joint. [Background technology]

[0002] In recent years, with the increase in earthquakes, the number of seismically isolated buildings that use seismic isolation structures to absorb earthquake tremors has been increasing. A seismic isolation structure is a structure in which a seismic isolation layer such as laminated rubber is placed between the building and the foundation, preventing horizontal ground movement caused by an earthquake from being directly transmitted to the building.As a result, the building moves slowly without following the shaking caused by the earthquake, and is not subjected to seismic forces from the ground. As mentioned above, a seismically isolated building equipped with a seismic isolation structure (the seismic isolation side) behaves differently in the event of an earthquake than the non-seismically isolated part (the non-seismically isolated side) that does not have a seismic isolation structure, so a "gap," or seismic isolation clearance, is required between the seismic isolation side and the non-seismically isolated side. If the gaps that ensure seismic isolation clearance are left as they are, various problems can arise in everyday life, such as people tripping over them or dropping objects, so when a seismic isolation structure is adopted, seismic isolation expansion joints are installed to close the seismic isolation clearance. Summary of the Invention [Problem to be solved by the invention]

[0003] The width of the seismic isolation clearance expands and contracts because the movement caused by earthquake shaking differs between the seismic isolation side and the non-seismic isolation side. The seismic isolation expansion joint is fixed on either the seismic isolation side or the non-seismic isolation side to prevent a gap from opening up in response to changes in the seismic isolation clearance, and is supported so that the other side can move. The seismic isolation expansion joints described above must have a certain strength so that no large gaps will open between the seismic isolation side and the non-seismic isolation side, not only during normal times but also during an earthquake, and so that people, vehicles, etc. can pass over them. When this seismic isolation expansion joint is finished with stone or tile, it is generally constructed as a box-shaped panel. Specifically, it consists of a box-shaped main panel, a base layer of low-moisture mortar (hereinafter referred to as "laying mortar") or the like applied to the main panel, and a finishing layer of stone or tile or the like applied to the base layer with a cement paste layer between them, one side of which is fixed so that it can rotate, has a shape that corresponds to the height of the step on the opposite side, is long enough to cover the seismic isolation clearance and rest on the step, and can maintain its position on the step when the seismic isolation clearance is opened to its maximum expected length, and is further configured so that it can climb over the step by rotating upward around one side of the fixed side during the process of closing the seismic isolation clearance to its minimum expected length. The seismic isolation expansion joint described above ensures safety during normal times, while eliminating gaps caused by seismic isolation clearances even in the event of an earthquake, thereby ensuring the safety of people and vehicles passing over it. Conventional seismic isolation expansion joints are often installed in conspicuous locations both indoors and outdoors, but only the functionality is emphasized, with little consideration given to appearance. Therefore, few measures have been developed to prevent the deterioration of the appearance. Specifically, conventional seismic isolation expansion joints for finishing stone materials, etc., are composed of a box-shaped main panel with a base layer, a cement paste layer, and a finishing layer to ensure their rigidity and functionality as described above. However, due to rainfall, etc., water gradually seeps inside the finishing layer through the joints etc. in the finishing layer, and accumulates inside the main panel. When this accumulated water increases and rises to the back of the finishing layer of the stone, etc., the finishing layer absorbs the water, causing water stains on the surface and significantly worsening the appearance. The present invention aims to solve the above problems and provide a panel for seismic isolation expansion joints that can prevent water stains from appearing on the finishing layer. [Means for solving the problem]

[0004] In order to achieve the above-mentioned object, the panel for a seismic isolation expansion joint of the present invention comprises a box-shaped main panel, and a base layer and a finishing layer laminated within the main panel, one side of the main panel is rotatably fixed, the main panel has a shape corresponding to the height of a step provided on the opposite side, the main panel rests on the step while covering the seismic isolation clearance, and has a length that allows it to remain resting on the step when the seismic isolation clearance is opened to its maximum expected length, and further, in the process of closing the seismic isolation clearance to its minimum expected length, the panel for a seismic isolation expansion joint is configured so that it can rotate upward around one side and climb over the step on the opposite side, and is characterized in that the main panel has a plurality of drainage holes, and the opening rate of the main panel due to the drainage holes is 5 to 90%. Preferably, the opening rate of the main panel due to the drainage holes may be 20 to 90%. The box-shaped main panel may be composed of a bottom plate and side plates that stand up from the periphery of the bottom plate so as to surround the bottom plate, and the drain holes may be formed in the bottom plate and / or the side plates. Furthermore, a plurality of reinforcing materials may be provided on the bottom plate of the main panel, and the base layer may be placed on the reinforcing materials, thereby forming an air layer having a plurality of drainage holes between the base layer and the bottom plate. The drain holes may also be arranged in a staggered or parallel pattern. Furthermore, the bottom plate of the main panel may be made of a material having a plurality of holes, such as a mesh panel, which may be used as the drain holes. In addition, a reinforcing material may be provided on the bottom plate of the main panel in parallel with the direction from the seismic isolation side to the non-seismic isolation side, and the drainage holes may be arranged in a direction perpendicular to the direction in which the reinforcing material is installed. Furthermore, a reinforcing material may be provided on the bottom plate of the main panel perpendicular to the direction from the seismic isolation side to the non-seismic isolation side, and the drainage holes may be arranged perpendicular to the direction in which the reinforcing material is installed. [Effects of the Invention]

[0005] The panel for a seismic isolation expansion joint according to the present invention comprises a box-shaped main panel and a base layer and a finishing layer laminated within the main panel, one side of the main panel is rotatably fixed, the panel has a shape corresponding to the height of a step provided on the opposite side, the panel rests on the step while covering the seismic isolation clearance, and has a length that enables the panel to remain resting on the step when the seismic isolation clearance is opened to its maximum anticipated length, and further, the panel is configured so that it can rotate upward around one side to get over the step in the process of closing the seismic isolation clearance to its minimum anticipated length, and the main panel has a plurality of drainage holes, and the opening rate of the main panel due to these drainage holes is 5 to 90%, so that even when it rains, moisture that has seeped into the main panel is efficiently reduced and moisture does not accumulate within the main panel, and therefore water stains do not occur over time. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is an exploded view of a first embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 2] FIG. 2 is a schematic longitudinal cross-sectional view of a panel for a seismic isolation expansion joint. [Figure 3] (a) is a diagram showing the use state (normal state) of a seismic isolation expansion joint using a seismic isolation expansion joint panel according to the present invention, (b) is a diagram showing the state of the seismic isolation expansion joint when the seismic isolation clearance S is opened to the maximum expected length Smax, and (c) is a diagram showing the state of the seismic isolation expansion joint when the seismic isolation clearance S is closed to the minimum expected length Smin. [Figure 4] FIG. 10 is an exploded view of a second embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 5] FIG. 10 is an exploded view of a third embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 6] FIG. 10 is an exploded view of a fourth embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 7] FIG. 10 is an exploded view of a fifth embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 8] FIG. 10 is an exploded view of a sixth embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 9] FIG. 10 is an exploded view of a seventh embodiment of a panel for a seismic isolation expansion joint according to the present invention. [Figure 10] 1 is a graph showing the change over time in the amount of remaining moisture in test specimens 1 to 6. DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, an embodiment of a panel for a seismic isolation expansion joint according to the present invention will be described with reference to the accompanying drawings. Fig. 1 is an exploded view of an embodiment of a panel for a seismic isolation expansion joint according to the present invention, and Fig. 2 is a schematic vertical cross-sectional view of the panel for a seismic isolation expansion joint according to the present invention, with a reinforcing member 5 (described later) removed. As shown in the drawings, the seismic isolation expansion joint panel 1 comprises a box-shaped main panel 2. The main panel 2 comprises a rectangular bottom plate 3 and side walls 4 (4a to 4d) surrounding the periphery of the rectangular bottom plate 3, with the side wall 4a, which is located on the seismic isolation building side (hereinafter referred to as the seismic isolation side) when in use, being rotatably fixed to the seismic isolation side, and the side wall 4b, which is located in a portion not equipped with a seismic isolation structure when in use (hereinafter referred to as the non-seismic isolation side), being provided with a flange 4e extending to the non-seismic isolation side. Furthermore, reinforcing members 5 are provided in the rectangular bottom plate 3 of the main panel 2 in parallel with the direction from the seismic isolation side to the non-seismic isolation side, and a plurality of drainage holes 6 are formed in the rectangular bottom plate 3 so as to avoid the reinforcing members 5. The drainage holes 6 are preferably of a size, arrangement, and number that results in an opening rate of 5 to 90% of the rectangular bottom plate 3; specifically, in this embodiment, for example, the diameter of the drainage holes 6 is φ8 and the arrangement pitch between the drainage holes 6 is 12 mm, so that the opening rate of the rectangular bottom plate 3 can be 40.3%. Note that the drawings in this application are prepared schematically to show the configuration, and it goes without saying that the dimensions of each component, including the drainage holes, are not to scale. In this embodiment, for example, a base layer 7 made of mortar with a low moisture content (hereinafter referred to as "laying mortar") is provided on top of the reinforcing material 5 of the main panel 2 configured as described above, and a finishing layer 9 made of stone, tile, etc. is provided on top of this base layer 7 via cement paste 8. As described above, by providing multiple drainage holes 6 in the rectangular bottom plate 3 so as to avoid the reinforcing material 5 and providing the base material 7 on top of the reinforcing material 5, an air layer 10 (see Figure 2) with drainage holes 6 is formed between the reinforcing materials 5, and the opening rate of the rectangular bottom plate 3 is set to 40.3%, even if it rains, etc., the moisture that penetrates into the main panel 2 is efficiently reduced, and moisture does not accumulate inside the main panel 2, and therefore water stains do not occur over time. The panel 1 for a seismic isolation expansion joint configured as described above, specifically the main panel 2, has one side (side wall 4a) rotatably fixed and rests on a step 20 formed on the opposite side (see Figure 3(a)). Therefore, the height H of the panel 1 for a seismic isolation expansion joint, specifically the main panel 2, is approximately the same as the depth D of the formed step 20. Furthermore, the length L of the panel 1 for a seismic isolation expansion joint, specifically the main panel 2, is a length that allows the panel 1 to remain resting on the step on the non-seismically isolated side when the seismic isolation clearance S is opened to the expected maximum length Smax (see Figure 3(b)). Furthermore, an inclined portion 21 is formed on the step 20 so that the panel can rotate upward around one side and climb over the step 20 during the process of closing the seismic isolation clearance S to the expected minimum length Smin (see Figure 3(c)).

[0008] Next, a second embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 4. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. FIG. 4 is an exploded view of a second embodiment of a panel for a seismic isolation expansion joint according to the present invention. As shown in the drawing, the panel for a seismic isolation expansion joint 1 according to the second embodiment comprises a base layer 7 provided inside a box-shaped main panel 2, and a finishing layer 9 provided on top of the base layer 7 with cement paste 8 interposed therebetween. A rectangular opening 3b is formed in the rectangular bottom plate 3 of the main panel 2, leaving the edge 3a, and a mesh panel 11 is placed on the edge 3a to cover the rectangular opening 3b, and the mesh panel 11 is configured to form a drainage hole 6. In this second embodiment, drainage holes are formed in the rectangular bottom plate 3 of the main panel 2 by the rectangular opening 3b and the mesh panel 11 covering the rectangular opening 3b, and the opening ratio of the main panel 2 is therefore, for example, 44.4%.

[0009] Next, a third embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 5. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. FIG. 5 is an exploded view of a third embodiment of a panel for a seismic isolation expansion joint according to the present invention. As shown in the drawing, the panel for a seismic isolation expansion joint 1 according to the third embodiment comprises a base layer 7 provided inside a box-shaped main panel 2, and a finishing layer 9 provided on top of the base layer 7 with cement paste 8 interposed therebetween. A plurality of slits 3c extending in the width direction are formed in the rectangular bottom plate 3 of the main panel 2, and a plurality of reinforcing members 5 are provided parallel to the direction from the seismic isolation side to the non-seismic isolation side. By forming the slits 3c in a direction perpendicular to the direction of the reinforcing members 5 in this way, the reinforcing members 5 do not completely block the slits 3c, and the slits 3c that appear between the reinforcing members 5 can function as drainage holes 6, and the opening ratio of the main panel 2 as a result is, for example, 45.2%.

[0010] Next, a fourth embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 6. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. FIG. 6 is an exploded view of a fourth embodiment of the panel for a seismic isolation expansion joint according to the present invention. As shown in the drawing, the panel for a seismic isolation expansion joint 1 according to the fourth embodiment comprises a base layer 7 provided inside a box-shaped main panel 2, and a finishing layer 9 provided on top of the base layer 7 with cement paste 8 interposed therebetween. A plurality of slits 3c extending in the width direction are formed in the rectangular bottom plate 3 of the main panel 2, and a plurality of reinforcing members 5 are provided in the direction from the seismic isolation side to the non-seismic isolation side, with the slits 3c appearing between the reinforcing members 5 functioning as drainage holes 6. In this embodiment, drainage holes 6 are also formed in the side walls 4c and 4d of the main panel 2. With the above-mentioned configuration, the slits 3c appearing between the reinforcing members 5 function as drainage holes 6, allowing water to drain from below the main panel 2, and the drainage holes 6 formed in the side walls 4c and 4d also allow water to drain from the sides of the main panel 2. Therefore, even if it rains, the amount of water that has seeped into the main panel 2 is efficiently reduced, and water does not accumulate inside the main panel 2. Therefore, water stains do not occur over time.

[0011] Next, a fifth embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 7. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. FIG. 5 is an exploded view of a fifth embodiment of the panel for a seismic isolation expansion joint according to the present invention. As shown in the drawing, the panel for a seismic isolation expansion joint 1 according to the fifth embodiment comprises a base layer 7 provided inside a shallow box-shaped main panel 2, and a finishing layer 9 provided on top of the base layer 7 with cement paste 8 interposed therebetween. The main panel 2 is provided with a plurality of reinforcing members 5 extending from the seismic isolation side to the non-seismic isolation side, and water drainage holes 6 are formed in the side walls 4c and 4d of the main panel 2. In this embodiment, drainage holes 6 are formed in the side walls 4c and 4d of the main panel 2, so that the drainage holes 6 are not blocked by the reinforcing material 5, and the efficiency of moisture reduction is not affected by the reinforcing material 5.

[0012] Next, a sixth embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 8. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. Figure 8 is an exploded view of a sixth embodiment of the panel for seismic isolation expansion joints according to the present invention. As shown in the drawing, the panel for seismic isolation expansion joints 1 according to the sixth embodiment comprises a base layer 7 provided inside a box-shaped main panel 2, and a finishing layer 9 provided on top of the base layer 7 with cement paste 8 interposed therebetween. The rectangular bottom plate 3 of the main panel 2 has a plurality of drain holes 6 arranged in a staggered pattern. In this embodiment, the main panel 2 does not have a reinforcing material 5, so the reinforcing material 5 does not block the drainage holes 6. Even if it rains, water is efficiently drained from the bottom of the main panel 2 through the drainage holes 6 arranged in a staggered pattern, so water does not accumulate in the main panel 2 and water stains do not occur over time.

[0013] Next, a seventh embodiment of the seismic isolation expansion panel according to the present invention will be described with reference to Fig. 9. Components that are the same as or equivalent to those in the first embodiment will be given the same reference numerals and detailed descriptions thereof will be omitted. Figure 9 is an exploded view of a seventh embodiment of the panel for seismic isolation expansion joints according to the present invention. As shown in the drawing, the panel for seismic isolation expansion joints 1 according to this sixth embodiment is configured by providing a base layer 7 inside a shallow box-shaped main panel 2, and providing a finishing layer 9 on top of the base layer 7 with cement paste 8 interposed therebetween. The rectangular bottom plate 3 of the main panel 2 has a plurality of drain holes 6 arranged in parallel. In this embodiment, the main panel 2 does not have a reinforcing material 5, so the reinforcing material 5 does not block the drainage holes 6. Even if it rains, the water that has seeped into the main panel 2 can be efficiently reduced through the parallel-arranged drainage holes 6, so water does not accumulate in the main panel 2 and water stains do not occur over time.

[0014] In the above-described embodiment, the reinforcing material 5 is installed in a direction from the seismic isolation side to the non-seismic isolation side, but this configuration is not limited to the embodiment, and the reinforcing material may be arranged in any direction as long as it can reinforce the strength of the panel for the seismic isolation expansion joint and does not block the drainage holes and reduce the opening rate of the main panel to less than 5%, for example, it may be arranged in the width direction of the main panel 2 (i.e., a direction perpendicular to the direction from the seismic isolation side to the non-seismic isolation side). Furthermore, in the above-described embodiment, the reinforcing material 5 is configured as a separate body from the main panel 2, but the configuration of the reinforcing material is not limited to the embodiment, and it goes without saying that, for example, the reinforcing material 5 may be formed by bending the main panel 2. Furthermore, in the first to fifth embodiments described above, a reinforcing material 5 is provided in the main panel 2 so as not to affect the opening rate of the drainage holes 6, but the reinforcing material 5 is not an essential component of the panel for seismic isolation expansion joints according to the present invention, and it is not necessary to provide the reinforcing material 5 as shown in the sixth and seventh embodiments.

[0015] Figure 10 is a graph showing the results of preparing six test specimens 1 to 6 with different opening ratios of the main panel, pouring 1 L of water into each of test specimens 1 to 6, measuring the weight of each of test specimens 1 to 6 after 4 days, 7 days, 17 days, 3 weeks, and 4 weeks, and measuring the amount of remaining moisture in each of test specimens 1 to 6 based on the weight before pouring in water. Specimen 1: Box-shaped main panel: No drain holes Reinforcement: 3 pieces (directed from the seismic isolation side to the non-seismic isolation side) Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 0% Test piece 2: Box-shaped main panel: with drain holes Drain holes: Arranged in parallel across the entire bottom plate Reinforcement: 3 pieces (directed from the seismic isolation side to the non-seismic isolation side) Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 5.19% Specimen 3: Box-shaped main panel: with drain holes Drain holes: Arranged in parallel across the bottom plate + staggered on the side walls Reinforcement: 3 pieces (directed from the seismic isolation side to the non-seismic isolation side) Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 10.04% Specimen 4: Box-shaped main panel: with drain holes Drain holes: Slits are placed across the entire width of the bottom plate (perpendicular to the direction from the seismic isolation side to the non-seismic isolation side) Reinforcement: 3 pieces (directed from the seismic isolation side to the non-seismic isolation side) Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 15.19% Specimen 5: Box-shaped main panel: with drain holes Drain holes: Slits placed across the width of the bottom plate (perpendicular to the direction from the seismic isolation side to the non-seismic isolation side) + staggered placement on the side walls Reinforcement: 3 pieces (directed from the seismic isolation side to the non-seismic isolation side) Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 24.19% Specimen 6: Box-shaped main panel: with drain holes Drainage holes: (Rectangular openings are formed in the bottom plate of the box-shaped main panel, and mesh panels are placed to cover the rectangular openings to form drainage holes.) Reinforcement: None Base layer: Mortar filling Finishing layer: stone Main panel aperture ratio: 32.6% From the graph in Figure 10, it can be seen that test specimen 1 had nearly 100% moisture remaining after four weeks, causing a serious problem of water stains due to long-term use, while test specimens 2 and 3 had nearly 60% moisture remaining after four weeks, causing almost no problem of water stains due to long-term use, and test specimens 4 to 6 had less than 40% moisture remaining after four weeks, meaning that they did not experience any problem of water stains due to long-term use. [Explanation of symbols]

[0016] 1. Seismic isolation expansion panels 2 Main Panel 3 Rectangular bottom plate 3a Edge (Second embodiment) 3b Rectangular opening (second embodiment) 3c Slit (third embodiment) 4 side wall 4a Side wall (earthquake-resistant side) 4b Side wall (non-seismically isolated side) 4c side wall 4d side wall 4e flange 5 Reinforcement 6 Drain holes 7 Base layer 8. Cement paste 9 Finishing Layer 10 Air Layer 11 Mesh panel (second embodiment) 20 Step (non-seismically isolated side) 21 Slope H Height of the seismic isolation expansion joint panel D Depth of step L: Length of the seismic isolation expansion joint panel S Seismic isolation clearance

Claims

1. The present invention comprises a box-shaped main panel, and a base layer and a finishing layer laminated within the main panel, A panel for a seismic isolation expansion joint, in which one side of the main panel is rotatably fixed, the main panel has a shape corresponding to the height of the step portion, the main panel rests on the step portion while covering the seismic isolation clearance, and has a length that allows it to maintain its resting state on the step portion when the seismic isolation clearance is opened to its maximum expected length, and further, is configured so that it can rotate upward around one side and climb over the step portion in the process of closing the seismic isolation clearance to its minimum expected length, wherein the main panel has a plurality of drainage holes, and the opening rate of the main panel due to the drainage holes is 5 to 90%.

2. The panel for a seismic isolation expansion joint according to claim 1, characterized in that the opening rate of the main panel due to the drainage holes is 20 to 90%.

3. The panel for a seismic isolation expansion joint described in claim 1, characterized in that the box-shaped main panel consists of a bottom plate and side plates that rise from the outer periphery of the bottom plate to surround it, and the drainage holes are formed in the bottom plate and / or the side plates.

4. A panel for a seismic isolation expansion joint as described in claim 1, characterized in that a plurality of reinforcing materials are provided on the bottom plate of the main panel, and the base layer is placed on the reinforcing materials, thereby forming an air layer with a plurality of drainage holes between the base layer and the bottom plate.

5. 2. The panel for a seismic isolation expansion joint according to claim 1, wherein the drain holes are arranged in a staggered pattern or in parallel.

6. 2. A panel for a seismic isolation expansion joint according to claim 1, wherein the bottom plate of the main panel is made of a mesh panel.

7. A panel for a seismic isolation expansion joint as described in claim 1, characterized in that the main panel has a reinforcing material on its bottom plate extending from the seismic isolation side to the non-seismic isolation side, and the drainage holes are arranged in a direction perpendicular to the direction of the reinforcing material.

8. A panel for a seismic isolation expansion joint as described in claim 1, characterized in that the main panel has a reinforcing material arranged on its bottom plate in a direction perpendicular to the direction from the seismic isolation side to the non-seismic isolation side, and the drainage hole is installed in a direction perpendicular to the direction of the reinforcing material.

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