JP2023168036A - Seismic isolation support member reinforcement structure - Google Patents

Abstract

To prevent an outer peripheral surface of a concrete member from being broken in a cone shape in an earthquake.SOLUTION: A seismic isolation support member reinforcement structure comprises: a seismic isolation device 20; an upper footing 40U arranged on the seismic isolation device 20; a stud 28 that has a fixing part buried in an outer peripheral part of a lower end part of the upper footing 40U, and connects an upper flange part 24 of the seismic isolation device 20 and the upper footing 40U; and a steel frame 50 that surrounds the outer peripheral surface of the lower end part of the upper footing 40U, and restrains the lower end part.SELECTED DRAWING: Figure 2

Description

The present invention relates to a seismic isolation support member reinforcement structure.

A seismic isolation repair method is known in which a steel plate is wrapped around an existing column to reinforce it, and then the existing column is partially cut out and a seismic isolation device is installed (for example, see Patent Document 1).

Japanese Patent Application Publication No. 9-100634

By the way, the seismic isolation device is fixed to a concrete member, for example, by embedding a stud provided in the flange portion in the outer peripheral portion of the concrete member such as a footing.

However, if the distance from the stud to the outer circumferential surface of the concrete member (edge distance) is short, there is a possibility that the outer circumferential surface of the concrete member will undergo cone-shaped failure starting from the stud during an earthquake.

The present invention takes the above-mentioned facts into consideration and aims to suppress cone-shaped failure of the outer circumferential surface of a concrete member during an earthquake.

The seismic isolation support member reinforcing structure according to claim 1 includes a seismic isolation device, a concrete member disposed above or below the seismic isolation device, and an anchor portion buried in an outer peripheral portion at an end of the concrete member. and a joining member that joins the flange portion of the seismic isolation device and the concrete member, and a steel frame that surrounds the outer peripheral surface of the end portion of the concrete member and restrains the end portion.

According to the seismic isolation support member reinforcement structure according to claim 1, the concrete member is arranged above or below the seismic isolation device. This concrete member and the flange portion of the seismic isolation device are joined by a joining member. The joining member has a fixing portion embedded in the outer peripheral portion at the end of the concrete member.

Here, the steel frame surrounds the outer peripheral surface at the end of the concrete member. By restraining the end portion of the concrete member with this steel frame, the outer peripheral surface of the end portion of the concrete member is prevented from cone-shaped fracture starting from the anchoring portion of the joining member during an earthquake.

The seismic isolation support member reinforcing structure according to claim 2 is the seismic isolation support member reinforcing structure according to claim 1, comprising a gap filler provided in a gap between the outer peripheral surface of the concrete member and the steel frame. .

According to the seismic isolation support member reinforcement structure according to claim 2, by providing a gap between the outer circumferential surface at the end of the concrete member and the steel frame, construction errors of the concrete member, construction errors of the steel frame, etc. are absorbed. can do.

Further, by providing a gap filler in the gap between the outer peripheral surface of the concrete member and the steel frame at the end, the end of the concrete member can be efficiently restrained by the steel frame.

As described above, in the present invention, it is possible to improve the workability of the steel frame and to suppress cone-shaped fracture of the outer peripheral surface of the end of the concrete member starting from the anchoring part of the joining member during an earthquake.

The seismic isolation support member reinforcing structure according to claim 3 is the seismic isolation support member reinforcing structure according to claim 2, in which the gap filling material is a filler filled in the gap.

According to the seismic isolation support member reinforcement structure according to claim 3, by filling the gap between the outer peripheral surface of the concrete member and the steel frame with a filler, the gap can be easily filled. Therefore, the workability of the steel frame is improved.

The seismic isolation support member reinforcing structure according to claim 4 is the seismic isolation support member reinforcing structure according to claim 2, wherein the gap filling material is an elastic body arranged in a compressed state in the gap.

According to the seismic isolation support member reinforcement structure according to claim 4, a compressed elastic body is disposed in the gap between the outer peripheral surface of the concrete member and the steel frame. This increases the efficiency of stress transfer between the end of the concrete member and the steel frame.

Therefore, it is possible to further prevent the outer circumferential surface of the end of the concrete member from fracturing in a cone shape starting from the anchoring portion of the joining member during an earthquake.

As explained above, according to the present invention, it is possible to suppress cone-shaped failure of the outer circumferential surface of a concrete member during an earthquake.

FIG. 2 is a vertical sectional view showing a seismic isolation device, an upper footing, and a lower footing to which the seismic isolation support member reinforcement structure according to the first embodiment is applied. 2 is a sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. FIG. 3 is a partially enlarged plan view of FIG. 2 showing a corner of the steel frame. 5 is a sectional view taken along line 5-5 in FIG. 4. FIG. FIG. 3 is a partially enlarged plan view of FIG. 2 showing reinforcing ribs and studs. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing an upper footing to which a seismic isolation support member reinforcing structure according to a second embodiment is applied. 8 is a sectional view taken along line 8-8 in FIG. 7. FIG.

(First embodiment)
First, a first embodiment will be described.

(seismic isolation structure)
FIG. 1 shows a seismic isolation layer of a seismic isolation structure 10 to which the seismic isolation support member reinforcement structure according to the first embodiment is applied. The seismic isolation layer of the seismic isolation structure 10 is provided with a seismic isolation device 20, an upper footing 40U, and a lower footing 40L. Note that the upper footing 40U and the lower footing 40L are examples of concrete members.

(Upper footing)
The upper footing 40U is made of reinforced concrete and protrudes downward from the lower surface of a beam (not shown). Further, the cross-sectional shape of the upper footing 40U is rectangular. The lower surface of this upper footing 40U is placed on the upper surface of an upper flange portion 24 of a seismic isolation device 20, which will be described later.

(Lower footing)
The lower footing 40L is arranged below the upper footing 40U. This lower footing 40L is made of reinforced concrete and protrudes upward from the upper surface of a beam (not shown). Further, the cross-sectional shape of the lower footing 40L is rectangular. The lower surface of the lower flange portion 26 of the seismic isolation device 20, which will be described later, is placed on the upper surface of the lower footing 40L.

Note that in this embodiment, the cross-sectional shape and size of the upper footing 40U and the upper flange portion 24 are the same, but the cross-sectional shape and size of the upper footing 40U and the upper flange portion 24 may be different. .

(Seismic isolation device)
The seismic isolation device 20 is arranged between the upper footing 40U and the lower footing 40L, and is joined to the upper footing 40U and the lower footing 40L, respectively. Moreover, the seismic isolation device 20 is, for example, a laminated rubber support, and supports the upper footing 40U so as to be movable in the horizontal direction with respect to the lower footing 40L. This seismic isolation device 20 has a seismic isolation device main body 22, an upper flange portion 24, and a lower flange portion 26.

The seismic isolation device main body 22 is formed in a cylindrical shape. Moreover, the seismic isolation device main body 22 has a plurality of metal layers and rubber layers stacked alternately. An upper flange portion 24 is provided at the upper end of the seismic isolation device main body 22 . On the other hand, a lower flange portion 26 is provided at the lower end portion of the seismic isolation device main body 22.

Note that the seismic isolation device main body 22 is not limited to a cylindrical shape, and may be formed, for example, in a prismatic shape.

The upper flange portion 24 and the lower flange portion 26 are, for example, formed of a rectangular steel plate or the like in plan view. Further, the upper flange portion 24 and the lower flange portion 26 protrude outward from the seismic isolation device main body 22.

Note that the upper flange portion 24 and the lower flange portion 26 are not limited to a rectangular shape in plan view, but may be formed in a circular shape, for example. Further, the upper flange portion 24 and the lower flange portion 26 are examples of flange portions.

The upper flange portion 24 is joined to the upper footing 40U. Specifically, a plurality of studs (headed studs) 28 are provided on the upper surface of the upper flange portion 24 . The plurality of studs 28 protrude upward from the upper surface of the upper flange portion 24.

As shown in FIG. 2, the plurality of studs 28 are centered on the central axis O of the seismic isolation device main body 22 in plan view, and are larger than the seismic isolation device main body 22, as shown by the dashed line. They are placed at intervals around the circumference of a circle.

Further, the plurality of studs 28 are embedded in the outer peripheral portion of the lower end (end) of the upper footing 40U. Via these studs 28, the seismic isolation device 20 and the upper footing 40U are joined so that shear force can be transmitted.

As shown in FIG. 1, the lower flange portion 26 is joined to the lower footing 40L. Specifically, a plurality of studs 28 are provided on the lower surface of the lower flange portion 26. The arrangement of these studs 28 is similar to that of the studs 28 provided on the upper flange portion 24.

The plurality of studs 28 protrude downward from the lower surface of the lower flange portion 26 and are embedded in the outer periphery of the upper end (end) of the lower footing 40L. Via these studs 28, the seismic isolation device 20 and the lower footing 40L are joined so that shear force can be transmitted.

Note that the number and arrangement of studs 28 can be changed as appropriate. Further, the stud 28 is an example of a joining member. Further, the stud 28 serves as a fixing portion that is entirely buried in the upper footing 40U or the lower footing 40L.

(Seismic isolation support member reinforcement structure)
Here, as shown in FIG. 3, if the distance from the outer peripheral surface of the stud 28 to the side surface (outer peripheral surface) 40S of the upper footing 40U (hereinafter referred to as "edge distance dimension R") is short, as shown by the dotted line. Furthermore, in the event of an earthquake, there is a possibility that the side surface 40S of the upper footing 40U will break in a cone shape starting from the stud 28.

As a countermeasure for this, in this embodiment, as shown in FIG. structure is applied.

Note that the seismic isolation support member reinforcement structure applied to the upper footing 40U and the lower footing 40L is the same. Therefore, below, the seismic isolation support member reinforcement structure applied to the upper footing 40U will be explained, and the explanation of the seismic isolation support member reinforcement structure applied to the lower footing 40L will be omitted.

As shown in FIG. 2, the seismic isolation support member reinforcement structure according to this embodiment includes a steel frame 50. The steel frame 50 is arranged around the lower end of the upper footing 40U. Further, the steel frame 50 has four steel members 52 joined together in a rectangular frame shape when viewed from above. Each steel frame member 52 is formed of H-beam steel and is arranged along each side surface 40S of the upper footing 40U.

As shown in FIG. 3, each steel member 52 has an inner flange portion 54 and an outer flange portion 56 that face each other in the horizontal direction, and a web portion 58 that connects the inner flange portion 54 and the outer flange portion 56. ing.

In addition, each steel frame member 52 has the thickness direction of the web portion 58 in the vertical direction, and the surface of the inner flange portion 54 on the upper footing 40U side (hereinafter referred to as "restriction surface 54S") is aligned with the side surface 40S of the upper footing 40U. They are placed facing each other. That is, the steel frame member 52 is arranged with its strong axis direction facing the upper footing 40U.

As shown in FIGS. 4 and 5, the steel member 52 protrudes from the side surface 40S of the upper footing 40U with a gap left between the restraining surface 54S of the inner flange portion 54 and the side surface 40S of the upper footing 40U. After that, it is supported by the construction anchor 70. The post-installation anchors 70 are provided in pairs (upper and lower stages) on both sides of the side surface 40S of the upper footing 40U in the width direction.

Note that the post-installation anchor 70 is an example of a support member.

A pair of upper and lower post-installation anchors 70 are inserted into through holes (not shown) formed in the inner flange portion 54 above and below the web portion 58 of the steel member 52. The inner flange portions 54 are fixed to the pair of upper and lower post-installation anchors 70 by sandwiching the inner flange portions 54 from both sides by a pair of nuts 72 attached to each post-installation anchor 70.

Note that the number and arrangement of the post-installation anchors 70 can be changed as appropriate. Further, the support member is not limited to the post-installation anchor 70, but may be, for example, a bracket fixed to the side surface 40S of the upper footing 40U.

As shown in FIG. 4, at each corner of the steel frame 50, the web portions 58 at the ends of adjacent steel members 52 are overlapped and joined by bolts 60 and nuts (not shown). Note that the ends of adjacent steel frame members 52 are partially cut off so that the inner flange portions 54 do not interfere with each other.

A slag stopper member 62 is provided at the corner of the end of the adjacent steel frame members 52. The slag stopper member 62 is formed of L-shaped steel (angle). This slag stopper member 62 is arranged across the inner flange portions 54 of adjacent steel frame members 52, and closes the gap between these inner flange portions 54.

As shown in FIG. 3, the steel member 52 is provided with a bottom formwork 64. The bottom formwork 64 is formed of a plate material such as a steel plate. Further, the bottom formwork 64 is provided from one end of the steel frame member 52 in the longitudinal direction (material axis direction) to the other end, and is fixed to the lower end of the inner flange portion 54 of the steel frame member 52 by welding or the like. has been done.

The bottom formwork 64 extends from the lower end of the inner flange portion 54 toward the upper footing 40U, and closes the gap between the restraining surface 54S of the inner flange portion 54 and the side surface 40S of the upper footing 40U from below. Note that the bottom formwork 64 may be attached to the steel frame member 52 in a factory or the like, or may be attached to the steel frame member 52 at the site.

A gap between the restraining surface 54S of the inner flange portion 54 and the side surface 40S of the upper footing 40U is filled with a filler 66 such as grout or mortar. The restraining surface 54S of the inner flange portion 54 is in close contact with the side surface 40S of the upper footing 40U via the filler 66. Note that the filler 66 is an example of a gap filling material.

The height H2 of the restraining surface 54S in the inner flange portion 54 of the steel member 52 is higher than the height H1 of the stud 28. The lower end 54S1 of this restraining surface 54S is located below the lower surface 40U1 (lower end of the side surface 40S) of the upper footing 40U, and the upper end 54S2 of the restraining surface 54S is arranged at approximately the same height as the tip 28T of the stud 28. ing. Thereby, in the side surface 40S of the upper footing 40U, a portion closer to the seismic isolation device 20 than the tip 28T of the stud 28 is restrained by the restraining surface 54S of the steel member 52.

As shown in FIG. 2, the steel member 52 is provided with a plurality of reinforcing ribs 68. Each reinforcing rib 68 is provided in a rib shape on the upper and lower surfaces of the web portion 58. Further, each reinforcing rib 68 is arranged along the direction in which the restraining surface 54S (see FIG. 3) of the inner flange portion 54 and the side surface 40S of the upper footing 40U face each other, and the inner flange portion 54 and the outer flange portion 56 are connected.

As shown in FIG. 6, the reinforcing rib 68 is arranged at a position facing the stud 28 where the edge distance R is the shortest. Specifically, it is arranged along an extension of an imaginary line V that connects the center C of the stud 28 where the edge distance R is the shortest and the side surface 40S of the upper footing 40U at the shortest distance in plan view. . These reinforcing ribs 68 support the inner flange portion 54 from the side opposite to the upper footing 40U.

Note that the number and arrangement of reinforcing ribs 68 can be changed as appropriate. Furthermore, the reinforcing ribs 68 may be provided as needed, and can be provided as appropriate.

(effect)
Next, the operation of the first embodiment will be explained.

As shown in FIG. 1, according to the seismic isolation support member reinforcement structure according to the present embodiment, an upper footing 40U is arranged on the seismic isolation device 20. This upper footing 40U and the upper flange portion 24 of the seismic isolation device 20 are joined via a plurality of studs 28. The plurality of studs 28 are embedded in the outer periphery of the lower end of the upper footing 40U.

Here, as described above using FIG. 3, when the edge distance R of the stud 28 is short, as shown by the dotted line, during an earthquake, the side surface 40S of the lower end of the upper footing 40U starts from the stud 28. There is a possibility of cone-shaped fracture.

As a countermeasure against this, in this embodiment, as shown in FIG. 2, a steel frame 50 is provided around the lower end of the upper footing 40U. The steel frame 50 surrounds a side surface (outer peripheral surface) 40S at the lower end of the upper footing 40U. By restraining the side surface 40S of the lower end of the upper footing 40U by the steel frame 50, the side surface 40S of the lower end of the upper footing 40U is prevented from cone-shaped fracture starting from the stud 28 during an earthquake.

Furthermore, by surrounding the side surface 40S of the lower end of the upper footing 40U with the steel frame 50, for example, in FIG. 2, the steel member 52 disposed on the left side of the upper footing 40U is The left side surface 40S of the upper footing 40U can be restrained by applying force. Therefore, for example, the number of post-installation anchors 70 that support the steel member 52 can be reduced.

As a result, drilling work and the like on the side surface 40S of the existing upper footing 40U is reduced, so that workability is improved and damage to the internal reinforcement etc. of the upper footing 40U is suppressed. Moreover, since the preliminary investigation of the internal reinforcement of the upper footing 40U is reduced, the workability is further improved.

Furthermore, as shown in FIG. 3, the lower end 54S1 of the restraint surface 54S of the steel frame member 52 is located below the lower surface 40U1 of the upper footing 40U, and the upper end 54S2 of the restraint surface 54S is located at the tip 28T of the stud 28. It is located at approximately the same height. That is, in this embodiment, a portion of the side surface 40S of the upper footing 40U that is closer to the seismic isolation device 20 than the tip 28T of the stud 28 is restrained by the restraining surface 54S of the steel member 52.

This can more reliably prevent the side surface 40S of the lower end of the upper footing 40U from fracturing into a cone shape starting from the stud 28 during an earthquake.

Further, the steel members 52 constituting the steel frame 50 are arranged with their strong axis directions facing the upper footing 40U. Thereby, the restraint force of the side surface 40S of the upper footing 40U is increased compared to the case where the steel frame member 52 is arranged with its weak axis direction facing the upper footing 40U.

Moreover, as shown in FIG. 6, the steel frame member 52 is provided with reinforcing ribs 68. The reinforcing rib 68 is arranged at a position facing the stud 28 where the edge distance R is the shortest. By supporting the inner flange portion 54 with this reinforcing rib 68, the restraining force of the side surface 40S of the upper footing 40U is further increased.

Therefore, in the event of an earthquake, the side surface 40S of the lower end of the upper footing 40U is further suppressed from cone-shaped fracture starting from the stud 28.

Furthermore, by providing a gap between the restraining surface 54S of the inner flange portion 54 of the steel member 52 and the side surface 40S of the upper footing 40U, construction errors of the upper footing 40U, construction errors of the steel frame 50, etc. are absorbed. be able to.

Furthermore, by filling the gap between the restraint surface 54S of the steel frame member 52 and the side surface 40S of the upper footing 40U with a filler 66, the restraint surface 54S of the steel frame member 52 is connected to the side surface 40S of the upper footing 40U via the filler 66. Closely attached. Thereby, the side surface 40S of the upper footing 40U can be efficiently restrained by the restraining surface 54S of the steel member 52. Further, the filler 66 can easily fill the gap between the restraining surface 54S of the steel member 52 and the side surface 40S of the upper footing 40U, thereby improving workability.

Furthermore, by configuring the steel frame 50 with a plurality of steel members 52 and assembling the steel frame 50 on site, the transportability and lifting performance of the steel members 52 are improved.

In this way, in this embodiment, while improving the workability of the steel frame 50, it is possible to suppress the cone-shaped fracture of the side surface 40S at the lower end of the upper footing 40U starting from the anchoring part of the stud 28 during an earthquake. I can do it.

(Second embodiment)
Next, a second embodiment will be described. In addition, in the second embodiment, members having the same configuration as those in the first embodiment are given the same reference numerals, and description thereof will be omitted as appropriate.

7 and 8 show an upper footing 40U to which the seismic isolation support member reinforcing structure according to the second embodiment is applied. As shown in FIG. 7, the seismic isolation support member reinforcement structure according to the present embodiment includes a steel frame 80, a plurality of base members 100, and a plurality of elastic bodies 102X and 102Y.

(steel frame)
The steel frame 80 is arranged around the lower end of the upper footing 40U. Further, the steel frame 80 includes four steel members 82X and 82Y joined together in a rectangular frame shape when viewed from above. Each steel frame member 82X, 82Y is formed of H-beam steel, and is arranged along each side surface 40S of the upper footing 40U.

Each of the steel members 82X, 82Y has an inner flange portion 84 and an outer flange portion 86 that face each other in the horizontal direction, and a web portion 88 that connects the inner flange portion 84 and the outer flange portion 86. Moreover, each steel frame member 82X, 82Y is arranged with its strong axis direction facing the side surface 40S of the upper footing 40U. Note that each steel frame member 82X, 82Y is appropriately reinforced by reinforcing ribs 90.

The pair of steel members 82X are arranged on both sides of the upper footing 40U in a predetermined direction (arrow X direction). On the other hand, the pair of steel members 82Y are arranged on both sides of the upper footing 40U in a direction intersecting the predetermined direction (arrow Y direction). Further, the pair of steel members 82X is arranged between the ends of the pair of steel members 82Y.

The pair of steel members 82X, 82Y are arranged with a gap between the restraining surface 84S of each inner flange portion 84 and the side surface 40S of the upper footing 40U. A pair of base members 100 and a plurality of elastic bodies 102X, 102Y are arranged in each gap.

(Base member)
The pair of base members 100 is formed of a steel plate or the like. Further, among the pair of base members 100, one base member 100 is arranged along the restraining surface 84S of the steel members 82X, 82Y, and the other base member 100 is arranged along the side surface 40S of the upper footing 40U. ing. A plurality of elastic bodies 102X and 102Y are arranged between the pair of base members 100.

Note that the pair of base members 100 may be provided as necessary, and may be omitted as appropriate.

(elastic body)
The plurality of elastic bodies 102X, 102Y are disk springs, for example. These elastic bodies 102X, 102Y are arranged so that the direction of expansion and contraction thereof is the opposite direction between the side surface 40S of the upper footing 40U and the restraining surface 84S of the steel frame members 82X, 82Y. Note that the elastic bodies 102X and 102Y are examples of gap filling materials and spring members.

The plurality of elastic bodies 102X are held in a compressed state between the pair of base members 100 by narrowing the distance between the pair of steel members 82X using the plurality of tensile members 110. Further, the plurality of elastic bodies 102Y are held in a compressed state between the pair of base members 100 by narrowing the distance between the pair of steel members 82Y using the plurality of tensile members 120.

Specifically, the plurality of tension members 110 are formed of tension wires such as PC steel bars, for example. Each tensile member 110 is arranged so as to cross the end of the steel member 82X. One end of this tension member 110 is fixed with a nut 114 to a bracket 112 provided at the end of the steel member 82X.

Further, the other end of the tensile member 110 is fixed to a bracket 112 provided on the steel member 82X with a nut 114. By tightening these nuts 114 onto the tension member 110 and narrowing the distance between the pair of steel members 82X, the plurality of elastic bodies 102X and 102Y are held in a compressed state. Note that the tensile members 110 are provided above and below the steel frame member 82X, respectively.

The plurality of tension members 120 are formed of tension wires such as PC steel rods, for example. Further, each tension member 120 is arranged along the steel frame member 82Y, and both ends thereof are fixed by nuts 124 to brackets 122 provided at the ends of the pair of steel frame members 82Y facing each other. . By tightening these nuts 124 onto the tension member 120 and narrowing the distance between the pair of steel members 82Y, the plurality of elastic bodies 102Y are held in a compressed state.

Note that the tensile members 120 are arranged above and below the steel members 82X and 82Y, respectively. However, for example, the tensile material 120 is inserted into the through holes formed in the inner flange part 84 and the outer flange part 86 of the steel frame member 82Y, and the through holes formed in each reinforcing rib 90 of the steel frame member 82X. Both ends of 120 may be fixed to the outer flange portion 86 of the steel member 82Y with nuts 124, respectively.

(effect)
Next, the operation of the second embodiment will be explained.

As shown in FIG. 7, according to the seismic isolation support member reinforcement structure, in the gap between the side surface 40S of the lower end of the upper footing 40U and the restraining surface 84S of the steel members 82X and 82Y that constitute the steel frame 80, A plurality of elastic bodies 102X and 102Y are arranged in a compressed state. Thereby, the stress transmission efficiency between the side surface 40S of the lower end portion of the upper footing 40U and the restraining surface 84S of each steel frame member 82X, 82Y is increased.

Moreover, by arranging the elastic bodies 102X and 102Y in the gap in a compressed state, prestress is applied to the lower end portion of the upper footing 40U. This can more reliably prevent the side surface 40S of the lower end of the upper footing 40U from fracturing into a cone shape starting from the stud 28 during an earthquake.

Furthermore, in this embodiment, there is no need for post-installation anchors or the like, and there is no need to drill holes in the upper footing 40U. Therefore, damage to the internal reinforcement of the upper footing 40U is suppressed, and workability is improved.

Further, in this embodiment, the elastic bodies 102X and 102Y are formed of disc springs. As a result, in this embodiment, a large elastic force can be obtained with a small installation space, compared to, for example, a case where the elastic body is formed of a coil spring. Therefore, the steel frame 80 can be made smaller.

Note that the elastic body is not limited to a disc spring, and may be a spring member such as a coil spring.

(Modified example)
Next, modifications of the first and second embodiments will be described. Note that various modifications will be described below using the first embodiment as an example, but these modifications can also be applied to the second embodiment as appropriate.

In the first embodiment, the height H2 of the restraining surface 54S of the steel member 52 is higher than the height H1 of the stud 28. However, the restraining surface 54S of the steel frame member 52 is capable of restraining at least a portion of the side surface 40S of the portion (lower end portion) of the upper footing 40U in which the stud 28 is embedded, for example, in the longitudinal cross-sectional view shown in FIG. It's good to have. Therefore, for example, the height H2 of the restraining surface 54S of the steel member 52 may be the same as the height H1 of the stud 28, or may be lower than the height H1 of the stud 28.

In addition, when the side surface 40S of the upper footing 40U undergoes a conical fracture starting from the stud 28 during an earthquake, stress tends to concentrate on the lower end of the side surface 40S. Therefore, it is preferable that the restraint surface 54S of the steel frame member 52 restrains at least the lower end side of the side surface 40S of the upper footing 40U.

Further, in the first embodiment, the gap between the restraining surface 54S of the steel member 52 and the side surface 40S of the upper footing 40U is filled with the filler 66. However, for example, the filler 66 may be omitted and the restraint surface 54S of the steel member 52 may be brought into contact with the side surface 40S of the upper footing 40U.

Moreover, in the first embodiment, the steel frame member 52 is formed of H-beam steel. However, the steel frame member is not limited to H-section steel, but may be formed of section steel such as I-section steel, C-section steel, L-section steel, etc., or may be formed of steel pipe steel.

Further, in the first embodiment, the joining member is the stud 28. However, the joining member is not limited to the stud 28. The joining member may include, for example, an embedded nut embedded in the lower end of the upper footing 40U, and a bolt that passes through the upper flange portion 24 of the seismic isolation device 20 and is tightened into the embedded nut. In this case, an embedded nut embedded in the lower end of the upper footing 40U serves as a fixing part for the joining member.

Further, the joining member may include an anchor member whose one end is buried in the end of the upper footing 40U, and a nut which fixes the other end of the anchor member to the upper flange portion 24 of the seismic isolation device 20. In this case, the part of the anchor member buried in the lower end of the upper footing 40U becomes the fixing part.

Moreover, in the first embodiment, the seismic isolation support member reinforcement structure is applied to the upper footing 40U and the lower footing 40L. However, the seismic isolation support member reinforcement structure according to the first embodiment can be applied to at least one of the upper footing 40U and the lower footing 40L.

Moreover, in the first embodiment, the concrete members are the upper footing 40U and the lower footing 40L. However, the concrete member is not limited to the upper footing 40U and the lower footing 40L, but may be, for example, a concrete column or the like arranged above or below the seismic isolation device in an intermediate seismic isolation structure.

Moreover, in the first embodiment, the seismic isolation device 20 is a laminated rubber support. However, the seismic isolation device is not limited to the laminated rubber bearing, and may be, for example, a sliding bearing, a rolling bearing, or the like.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and the embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention may be It goes without saying that the invention can be implemented in various ways without departing from the scope.

20 Seismic isolation device 28 Stud (joining member, anchoring part)
40U upper footing (concrete member)
40L Lower footing (concrete member)
50 Steel frame 66 Filler (gap filling material)
80 Steel frame 102 Elastic body (gap filling material)
102X Elastic body (gap filling material)
102Y Elastic body (gap filling material)

Claims (4)

A seismic isolation device,
a concrete member placed above or below the seismic isolation device;
a joining member that has a fixing part buried in the outer peripheral part of the end of the concrete member and joins the flange part of the seismic isolation device and the concrete member;
a steel frame surrounding the outer peripheral surface of the end of the concrete member and restraining the end;
Seismic isolation support member reinforcement structure. comprising a gap filler provided in a gap between the outer peripheral surface of the concrete member and the steel frame;
The seismic isolation support member reinforcement structure according to claim 1. The gap filling material is a filler that is filled into the gap,
The seismic isolation support member reinforcement structure according to claim 2. The gap filler is an elastic body placed in the gap in a compressed state.
The seismic isolation support member reinforcement structure according to claim 2.