Elevator seismic isolation structure

Abstract

To provide a base isolation structure for an elevator capable of making all of the elevator shaft isolated independently from a building.SOLUTION: A base isolation structure 1 for an elevator is provided with: an elevator bit 10; an isolation support 30 arranged in the elevator pit 10; a beam structural body 20 supported on the isolation support 30; an upper frame 50 erected on the beam structural body 20; and an elevator body 70 supported with the upper frame 50, wherein the beam structural body 20 comprises a base connection beam 21 supported on the isolation support 30 and formed in a rectangular shape in a plan view.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a seismic isolation structure for elevators.

Background Art

[0002] Conventionally, elevators have an automatic recovery operation function. Generally, when shaking of seismic intensity level 4 is detected, it is set to automatically stop at the nearest floor so that people can exit the elevator car. However, there have been many reports that during medium and large earthquakes, it cannot stop appropriately and people are trapped inside the elevator car.

[0003] Once the elevator stops, it cannot be restarted until safety confirmation is carried out by the maintenance staff. In this case, the elevator cannot be used immediately after the earthquake, and there is concern that evacuation and the delivery of daily necessities such as water, food, and medicine will be delayed in medium and high-rise buildings. Therefore, seismic isolation of elevators is required so that they can continue to function without stopping even during an earthquake.

[0004] In the following Patent Documents 1 to 3, elevator devices used in seismic isolation structure buildings have been proposed.

[0005] In the following Patent Document 4, an elevator structure is provided inside an elevator shaft (hoistway) formed of concrete for storing an elevator. A seismic isolation device is installed between the lower part of the elevator structure and the bottom of the elevator shaft, and a seismic damping device is installed between the lower part of the elevator structure and the wall of the elevator shaft.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

[0007] However, the elevator systems described in Patent Documents 1 to 3 do not isolate the elevator itself (as a standalone unit), and therefore cannot be applied unless the building has a seismic isolation structure.

[0008] The seismic isolation structure for elevators described in Reference 4 can be handled by conventional systems in the event of an earthquake of magnitude 4 or less, and in the event of an earthquake of magnitude 6 or higher, operation will resume after safety checks by maintenance personnel as usual. Therefore, the effect is only realized in the event of an earthquake of magnitude 5, and the benefits are small. Furthermore, because the elevator frame is constructed on top of seismic isolation devices installed at the bottom of the elevator shaft, a seismic isolation clearance is required between the elevator shaft and the elevator frame. As a result, only elevator cars smaller than those that fit within a normal elevator shaft can be installed, and clearance adjustments (such as floor expansion joints) are required between the elevator car and the elevator hall floor at the entrances and exits of each floor, resulting in an inefficient system. Furthermore, in the event of a major earthquake of magnitude 6 or higher, there is a concern that the elevator structure may bend and deform, potentially colliding with the elevator shaft wall (concrete wall). Because the upper part of the elevator structure is prone to bending deformation, horizontal displacement increases on the upper floors, increasing the risk of collision with the elevator shaft wall.

[0009] Therefore, the present invention has been made in view of the above circumstances, and provides an elevator seismic isolation structure that can seismically isolate the entire elevator shaft independently of the building. [Means for solving the problem]

[0010] To achieve the above objective, the present invention employs the following means. In other words, the seismic isolation structure for an elevator according to the present invention comprises an elevator pit, a seismic isolation bearing provided on the elevator pit, a beam structure supported by the seismic isolation bearing, an upper frame fixed to and erected on the beam structure, and an elevator body supported by the upper frame.

[0011] In this type of elevator seismic isolation structure, the beam structure supported by seismic isolation bearings, the upper frame, and the elevator body can be seismically isolated independently of other structures.

[0012] Furthermore, in the seismic isolation structure for elevators according to the present invention, the beam structure has a foundation tie beam supported by the seismic isolation bearing and formed in the shape of a square in plan view, and an outrigger beam supported by the foundation tie beam and formed in the shape of a grid in plan view, and the upper frame may be fixed to the outrigger beam.

[0013] In this type of elevator seismic isolation structure, the support spacing (bearing interval) of the outrigger beams is greater than the column spacing of the upper frame. As a result, the lifting of the beam structure at the lower end of the upper frame is less likely to occur, and rotation at the lower end of the upper frame is also less likely to occur. Therefore, the risk of insufficient clearance on the upper floors causing the upper frame and structure to collide at the elevator entrance / exit can be suppressed.

[0014] Furthermore, in the seismic isolation structure for elevators according to the present invention, the beam structure is supported by the seismic isolation bearing and has a foundation tie beam that is formed in a square shape in plan view, and the upper frame may be fixed to the foundation tie beam.

[0015] In this type of elevator seismic isolation structure, the beam structure, upper frame, and elevator body can be seismically isolated independently without the need for outrigger beams. This eliminates the construction effort required to install outrigger beams, but it results in larger column spacing in the upper frame.

[0016] In addition, the seismic isolation structure of the elevator according to the present invention includes a lower frame suspended from a beam structure in the elevator pit.

[0017] In the seismic isolation structure of the elevator configured as described above, since the lower frame suspended from the beam structure is provided, the elevator main body can be stably supported even in the basement.

[0018] In addition, in the seismic isolation structure of the elevator according to the present invention, the seismic isolation bearing may be a sliding bearing.

[0019] In the seismic isolation structure of the elevator configured as described above, the sliding bearing can exhibit a seismic isolation effect and reduce the seismic force transmitted to the elevator.

Effect of the Invention

[0020] According to the seismic isolation structure of the elevator according to the present invention, the entire elevator shaft can be seismic isolated independently of the building.

Brief Description of the Drawings

[0021] [Figure 1] It is a schematic diagram showing the seismic isolation structure of the elevator according to the first embodiment of the present invention, and is an elevation view taken along line I-I of FIG. 2. [Figure 2] It is a schematic plan view showing the seismic isolation structure of the elevator according to the first embodiment of the present invention. [Figure 3] It is an exploded perspective view of the slider of the seismic isolation bearing of (a) the first embodiment of the present invention, and is an exploded perspective view of the seismic isolation bearing of (b). [Figure 4] It is a plan view of the seismic isolation bearing of (a) the first embodiment of the present invention, a cross-sectional view taken along line b-b of (b)(a), and a cross-sectional view taken along line c-c of (b)(a). [Figure 5] It is a diagram showing the normal state of the seismic isolation bearing of the first embodiment of the present invention. [Figure 6] It is a diagram showing the state of the seismic isolation bearing during an earthquake in the first embodiment of the present invention. [Figure 7] This is a schematic diagram showing the seismic isolation structure of an elevator according to the second embodiment of the present invention, and is an elevation view of the line VII-VII in Figure 8. [Figure 8] This is a schematic diagram showing the seismic isolation structure of an elevator according to a second embodiment of the present invention, and is a plan view at the position of the upper frame. [Figure 9] This is a schematic diagram showing the seismic isolation structure of an elevator according to the second embodiment of the present invention, and is a plan view at the position of the foundation tie beam. [Modes for carrying out the invention]

[0022] (First Embodiment) The seismic isolation structure of an elevator according to the first embodiment of the present invention will be described with reference to the drawings. Figure 1 is a schematic diagram showing the seismic isolation structure of an elevator according to the first embodiment of the present invention, and is an elevation view of line II in Figure 2. As shown in Figure 1, the seismic isolation structure 1 of the elevator according to this embodiment comprises an elevator pit 10, an elevator structure 2, and a seismic isolation bearing 30.

[0023] The elevator pit 10 is located underground. The elevator pit 10 has a base plate 11 and a peripheral wall (pit wall) 12 erected from the outer edge of the base plate 11. An outward-projecting overhang 12a is provided at the upper end of the peripheral wall 12. Inside the elevator pit 10, a storage space 10s is formed that can accommodate the lower part of the elevator structure 2, which will be described later.

[0024] The elevator structure 2 includes a beam structure 20, an upper frame 50, a lower frame 60, and an elevator body 70.

[0025] The beam structure 20 includes a foundation tie beam 21 and an outrigger beam 40.

[0026] Figure 2 is a schematic plan view showing the seismic isolation structure 1 of the elevator. The foundation tie beam 21 is positioned above the cantilevered section 12a. The foundation tie beam 21 is supported by the seismic isolation bearing 30, which will be described later. The foundation tie beam 21 is positioned along the extending direction of the cantilevered section 12a. As shown in Figure 2, in plan view, the foundation tie beam 21 is formed in a square shape. The foundation tie beam 21 may be configured by joining at its ends a pair of beams extending in a first direction along the horizontal plane (indicated by arrow a in Figure 2) and a pair of beams extending in a second direction perpendicular to the first direction along the horizontal plane (indicated by arrow b in Figure 2), so that the whole structure forms a square shape in plan view.

[0027] As shown in Figure 1, the outrigger beam 40 is fixed to the foundation tie beam 21 or to its side.

[0028] As shown in Figure 2, the outrigger beam 40 includes a pair of first beams 41, a pair of second beams 42, a pair of third beams 43, and a pair of fourth beams 44.

[0029] The first beam 41 extends in the first direction (indicated by arrow a in Figure 2). The pair of first beams 41 are spaced apart in the second direction (indicated by arrow b in Figure 2). The second beam 42 extends in the second direction. The pair of second beams 42 are spaced apart in the first direction. The second beams 42 are joined to the first beam 41 at their midpoint along their length. The pair of first beams 41 and the pair of second beams 42 form a grid-like structure in plan view.

[0030] A pair of third beams 43 are located on the foundation tie beam 21 and extend in a first direction. A pair of fourth beams 44 are located on the foundation tie beam 21 and extend in a second direction. In plan view, the pair of third beams 43 and the pair of fourth beams 44 form a square shape, surrounding the outside of the pair of first beams 41 and the pair of second beams 42. If the outrigger beams 40 are joined to the sides of the foundation tie beam 21, the depth of the foundation tie beam 21 may be made the same as that of the outrigger beams 40, and the third beams 43 and fourth beams 44 may be omitted.

[0031] As shown in Figure 1, the upper frame 50 has four columns 51, a plurality of connecting members 52, and an upper support section 55.

[0032] As shown in Figure 2, the lower end of the column 51 is fixed and erected at the intersection of the first beam 41 and the second beam 42 of the outrigger beam 40.

[0033] As shown in Figure 1, the connecting member 52 is a steel beam member that connects adjacent columns 51. Multiple connecting members 52 are arranged spaced apart in the vertical direction. The connecting member 52 has a pair of first connecting members 53 that connect adjacent columns 51 in a first direction, and a pair of second connecting members (not shown) that connect adjacent columns 51 in a second direction. In plan view, the connecting member 52 is arranged in a four-sided frame shape by the pair of first connecting members 53 and the pair of second connecting members. The upper support part 55 connects the upper ends of the four columns 51.

[0034] The lower frame 60 is housed inside the elevator pit 10. The lower frame 60 has four vertical members (suspension columns) 61 and multiple horizontal members (beams) 62.

[0035] The upper end of the vertical member 61 is fixed and suspended at the intersection of the first beam 41 and the second beam 42 of the outrigger beam 40.

[0036] The horizontal members 62 join the lower ends of adjacent vertical members 61. The horizontal members 62 have a pair of first joining members 63 that join adjacent vertical members 61 in a first direction, and a pair of second joining members (not shown) that join adjacent vertical members 61 in a second direction. In plan view, the horizontal members 62 are arranged in a four-sided frame shape by the pair of first joining members 63 and the pair of second joining members.

[0037] The vertical members 61 of the lower frame 60 are positioned between them and the surrounding wall 12 of the elevator pit 10, leaving a seismic isolation clearance s1.

[0038] The elevator body (elevator car) 70 is supported by the upper frame 50 via a suspension rope 71 that is wrapped around a sheave (not shown) located in a machine room 72 installed in the upper support portion 55 of the upper frame 50. In Figure 1, the range of movement of the elevator body 70 is shown by a dashed line 70a.

[0039] In this embodiment, the seismic isolation bearing 30 is an inclined sliding bearing. The seismic isolation bearing 30 is for supporting the elevator structure 2 so that it can slide horizontally in all directions relative to the elevator pit 10, which is its supporting structure. As shown in Figure 2, the seismic isolation bearings 30 are installed at the four corners of the overhang portion 12a of the elevator pit 10. Note that a sliding bearing is one embodiment of the seismic isolation bearing, and an inclined sliding bearing is used as an example of a sliding bearing.

[0040] Figure 3 is (a) an exploded perspective view of the slider 35 of the seismic isolation bearing 30, and (b) an exploded perspective view of the seismic isolation bearing 30. As shown in Figure 3, the seismic isolation bearing 30 includes an upper guide member 33, a lower guide member 34, and a slider 35. The upper guide member 33 is fixed to the lower part of the foundation tie beam 21 (see Figure 1). The lower guide member 34 is fixed to the upper part of the overhang 12a of the elevator pit 10 (see Figure 1). The slider 35 is interposed between the upper guide member 33 and the lower guide member 34. The slider 35 is held so as to be slidable only in one horizontal direction relative to the upper guide member 33 (shown as the XX direction in Figure 3). The slider 35 is held so as to be slidable only in another horizontal direction perpendicular to the horizontal direction relative to the lower guide member 34 (shown as the YY direction in Figure 3).

[0041] Figure 4 shows (a) a plan view of the seismic isolation support 30, (b) a cross-sectional view of (a) along line bb, and (b) a cross-sectional view of (a) along line cc. The upper guide member 33 and the lower guide member 34 are both identical in shape and size, forming horizontally elongated blocks with a rectangular cross-section. The upper guide member 33 and the lower guide member 34 are oriented perpendicular to each other in their longitudinal directions. The upper guide member 33 and the lower guide member 34 are positioned opposite each other with a gap between them in the vertical direction. As shown in Figures 4(b) and (c), in this configuration, the upper guide member 33 is fixed to the foundation tie beam 21, and the lower guide member 34 is fixed to the overhang portion 12a of the elevator pit 10.

[0042] As shown in Figure 3(b), grooves are formed along the longitudinal direction of the upper guide member 33 and the lower guide member 34 on their opposing surfaces (i.e., the lower surface of the upper guide member 33 and the upper surface of the lower guide member 34). The depth of the grooves gradually decreases from the center toward both sides. The bottom surface of the grooves is an inclined surface that slopes in a gentle V shape.

[0043] The groove of the upper guide member 33 faces downward, and the direction of extension of the groove is aligned with the XX direction. The upper guide member 33 is fixed to the upper structure 17. As a result, the bottom surface of the groove formed in the upper guide member 33 is a downward-facing upper inclined surface 36 that slopes gently in an inverted V shape along the XX direction.

[0044] The groove of the lower guide member 34 faces upward, and the direction of extension of the groove is aligned with the YY direction. The lower guide member 34 is fixed to the elevator pit 10. As a result, the bottom surface of the groove formed in the lower guide member 34 is an upward-facing lower inclined surface 37 that slopes gently in a V-shape along the YY direction.

[0045] Figure 5 shows the seismic isolation bearing 30 in its normal state. As shown in Figure 5, if W is the axial force (self-weight) supported by the seismic isolation bearing 30, the restoring force (horizontal force) F due to the inclination is expressed by equation (1), where θ is the angle of inclination with respect to the horizontal plane. The contact surface of the slider 35 is the entire upper surface. Hereinafter, μ is the coefficient of friction of the inclined surface, and μW represents the frictional force.

[0046]

number

[0047] Figure 6 shows the state of the seismic isolation bearing 30 during an earthquake. As shown in Figure 6, the seismic isolation bearing 30 moves in response to the horizontal displacement that occurs in the seismic isolation layer during an earthquake. The contact surface of the slider 35 is half of the upper surface. Note that the actual slope is 1 / 100 to 1 / 20, but the inclination angle θ is shown as large for clarity.

[0048] The relationship between the inclination angle θ and the coefficient of friction μ of the inclined surface is expressed by equation (2).

[0049]

number

[0050] The value of tanθ is assumed to be a value corresponding to the friction coefficient μ between 0.1 and 0.4. Furthermore, the friction coefficient needs to be adjusted for seismic displacement, but a low-friction material is used to achieve μ ≤ 0.06.

[0051] In the above-described seismic isolation structure 1 for elevators, the elevator structure 2 can be seismically isolated, eliminating the need for seismic isolation clearance between the elevator body 70 and the upper frame 50, and also eliminating the need for clearance adjustments (expansion joints) at the entrances and exits of the elevator car on each floor.

[0052] As shown in Figure 1, the support spacing (=bearing spacing) of the outrigger beam 40 is greater than the column spacing B of the upper frame 50. The overturning moment M of the elevator is expressed by equation (3), using the seismic force Q and the height H up to the seismic isolation bearing 30.

[0053]

number

[0054] When there is an outrigger beam 40 (in this embodiment), the support reaction force (axial force) PA and the column base reaction force PB of the column 51 of the upper frame 50 when there is no outrigger beam 40 are represented by equations (4) and (5), respectively.

[0055]

Number

[0056]

Number

[0057] Since A > B, PA < PB. Therefore, it is difficult for lifting due to the overturning moment to occur, and the rotation of the outrigger beam 40 (rotation of the column base part of the column 51) is also suppressed.

[0058] In the seismic isolation structure 1 of the elevator configured as described above, the elevator structure body 2 supported by the seismic isolation bearing 30 can be seismic isolated independently from other structures. Since the seismic isolation structure 1 of the elevator is an independent seismic isolation structure without being integrated with other structures, it can be added adjacent to an existing seismic-resistant structure such as RC and only the elevator connected in the corridor can be seismic isolated.

[0059] Also, the distance A between the support points of the outrigger beam 40 is larger than the distance B between the columns 51 of the upper frame 50. For this reason, it is difficult for the upper beam structure body 20 at the lower end of the upper frame 50 to lift, and it is also difficult for rotation to occur at the lower end of the upper frame 50. Therefore, it is possible to suppress the possibility that the clearance is insufficient on the upper floor and the upper frame 50 and the structure collide at the elevator landing.

[0060] In addition, since a lower frame 60 suspended from the beam structure body 20 is provided, the elevator main body 70 can be stably supported even underground.

[0061] Furthermore, by employing inclined sliding bearings as seismic isolation bearings 30, the seismic isolation effect can be achieved, reducing the seismic force transmitted to the elevator structure 2. Since structures to which inclined sliding bearings are applied do not have a natural period, there is no possibility of resonance. Torsion due to load fluctuations (load eccentricity) is less likely to occur, and the impact on the seismic isolation effect is minimal.

[0062] Furthermore, since the upper frame 50 is seismically isolated at the same time as the elevator body 70, there is no need to provide a seismic isolation clearance between the elevator body 70 and the upper frame 50. As a result, a large gap (clearance) between the concrete wall and the elevator car, as in conventional designs, is not required, and a larger elevator body (elevator car) 70 can be installed.

[0063] Furthermore, while a seismic isolation clearance s1 is required between the lower frame 60 and the surrounding wall 12 of the elevator pit 10 in the underground elevator pit 10, a seismic isolation clearance is not required between the elevator body 70 and the upper frame 50 above ground. Therefore, the upper frame 50 can be designed to be compact and rational without being excessively large compared to the elevator body 70.

[0064] Furthermore, the load of the upper frame 50 can be smoothly transmitted to the seismic isolation bearing 30 via the outrigger beam 40 and the foundation tie beam 21 while maintaining a predetermined seismic isolation clearance s1 in the underground section.

[0065] (Second embodiment) Next, the seismic isolation structure of the elevator according to the second embodiment of the present invention will be described mainly with reference to Figures 7 to 9. In the embodiments described below, the same reference numerals are used for members and parts that are the same as or similar to those in the first embodiment described above, and their descriptions are omitted. Configurations that differ from the embodiment will be described.

[0066] Figure 7 is a schematic diagram showing the seismic isolation structure of an elevator according to the second embodiment of the present invention, and is an elevation view of line VII-VII in Figure 8. Figure 8 is a schematic diagram showing the seismic isolation structure of an elevator according to the second embodiment of the present invention, and is a plan view at the position of the upper frame. Figure 9 is a schematic diagram showing the seismic isolation structure of an elevator according to the second embodiment of the present invention, and is a plan view at the position of the foundation tie beam. As shown in Figure 7, the seismic isolation structure 1A of the elevator according to this embodiment comprises an elevator pit 10, an elevator structure 2A, and a seismic isolation bearing 30.

[0067] The elevator structure 2A includes a beam structure 20A, an upper frame 50A, and an elevator body 70A.

[0068] The beam structure 20A has a foundation tie beam 21. The beam structure 20A does not have an outrigger beam.

[0069] The upper frame 50A has four columns 51A, multiple connecting members 52A (see Figure 8), and an upper support section 55A.

[0070] The lower ends of the columns 51A are fixed to the four corners of the foundation tie beam 21. As shown in Figure 8, the connecting members 52A connect adjacent columns 51A. Multiple connecting members 52A are arranged spaced apart in the vertical direction. The connecting member 52A has a pair of first connecting members 53A that connect adjacent columns 51A in a first direction, and a pair of second connecting members 54A that connect adjacent columns 51A in a second direction. In plan view, the connecting member 52A is arranged in a four-sided frame shape by the pair of first connecting members 53A and the pair of second connecting members 54A. As shown in Figure 7, the upper support part 55A connects the upper ends of the four columns 51A.

[0071] As shown in Figure 8, a pair of first connecting members 53A are joined together by a pair of secondary beams 56. The secondary beams 56 extend in the second direction. Multiple secondary beams 56 are arranged spaced apart in the vertical direction.

[0072] A guide rail 57 is supported by a small beam 56. The guide rail 57 has four vertical rails 57a that extend in the vertical direction and horizontal rails 57b that connect the vertical rails 57a to each other. Multiple horizontal rails 57b are arranged spaced apart in the vertical direction. The vertical rails 57a are joined to the small beam 56.

[0073] In this embodiment, a lower frame is not provided, but the lower rail may be fixed in place by being suspended from the small beam 56 located at the very bottom.

[0074] As shown in Figure 7, the elevator body (elevator car) 70A is supported by the upper frame 50A via a suspension rope 71 that is wrapped around a sheave (not shown) provided in the machine room 72 installed in the upper support portion 55A of the upper frame 50A. The elevator body 70A is guided to move up and down by the guide rail 57. In Figure 7, the range of movement of the elevator body 70A is shown by the dashed line 70b.

[0075] The upper guide member 33 (see Figure 4) of the seismic isolation bearing 30 is fixed to the lower part of the foundation tie beam 21. The lower guide member 34 (see Figure 4) is fixed to the upper part of the overhang 12a of the elevator pit 10. The seismic isolation bearing 30 supports the elevator structure 2A so that it can slide freely in all horizontal directions relative to the elevator pit 10, which is its supporting structure.

[0076] In the elevator seismic isolation structure 1A configured in this way, the elevator structure 2A supported by the seismic isolation bearings 30 can be seismically isolated independently of other structures. Since the elevator seismic isolation structure 1A is an independent seismic isolation structure that is not integrated with other structures, it can be added to existing earthquake-resistant structures such as reinforced concrete, and only the elevator connected to the corridor can be seismically isolated.

[0077] Furthermore, since the elevator structure 2A can be seismically isolated independently without installing outrigger beams, the construction work required to install outrigger beams can be omitted. However, since the spacing between the columns 51A of the upper frame 50A is wider than in the first embodiment, the flat area of ​​the upper frame 50A relative to the dimensions of the elevator car will increase.

[0078] It should be noted that the assembly procedure, or the various shapes and combinations of each component shown in the above-described embodiment, are merely examples and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0079] For example, in the embodiment described above, an inclined sliding bearing was used as an example of the seismic isolation bearing 30, but the present invention is not limited thereto. An inclined elastic sliding bearing or a spherical sliding bearing, as disclosed in Japanese Patent Application Publication No. 2019-138376, can also be used as the seismic isolation bearing 30. In addition, a laminated rubber bearing can be used instead of a sliding bearing. [Explanation of Symbols]

[0080] 1.1A Elevator seismic isolation structure 2.2A Elevator Structure 10 Elevator Pit 20,20A beam structure 21 Foundation connecting beam 30 Seismic isolation bearings 40 Outrigger beams 50, 50A Upper Frame 60 Lower frame 70,70A Elevator Unit

Claims

1. Elevator pit and A seismic isolation bearing is provided on the elevator pit, A beam structure supported by the aforementioned seismic isolation bearing, An upper frame fixed to the aforementioned beam structure and erected, The elevator comprises an elevator body supported by the aforementioned upper frame, The aforementioned beam structure is Supported by the aforementioned seismic isolation bearing, the foundation tie beam is formed in a square shape in plan view, It has an outrigger beam that is supported by the aforementioned foundation tie beam and is formed in a grid shape in plan view, The upper frame is fixed to the outrigger beam, The seismic isolation bearing is positioned below the outrigger beam. An elevator seismic isolation structure in which the spacing between the seismic isolation bearings is greater than the spacing between the columns of the upper frame.

2. The seismic isolation structure for an elevator according to claim 1, comprising a lower frame suspended from the beam structure within the elevator pit.

3. The seismic isolation structure for an elevator according to claim 1 or 2, wherein the seismic isolation bearing is a sliding bearing.

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