JP7398360B2 - Seismic isolation structure - Google Patents

Description

The present invention relates to a seismic isolation structure that includes a seismic isolation device and a cooling device that cools the seismic isolation device.

Conventionally, seismic isolation sliding bearings have been proposed that include a sliding plate and an elastic sliding bearing (laminated rubber) slidably provided on the sliding plate.
By the way, in many past earthquakes, seismic motion acted on buildings for about 2 minutes (about 100 seconds). However, it is predicted that huge earthquakes like the Nankai Trough earthquake will occur in the future. This huge earthquake is predicted to be a long-period, long-duration earthquake, with seismic motion acting on buildings for about 10 minutes (approximately 600 seconds).
When such long-period earthquake motion acts on the above-mentioned seismic isolation sliding bearing, the elastic sliding bearing and the sliding plate repeatedly slide, and the surface temperature of the sliding plate increases. This causes a problem in that the friction coefficient of the sliding plate decreases and the displacement of the elastic sliding bearing increases.

Therefore, the following seismic isolation sliding bearings have been proposed.
Patent Document 1 discloses a seismic isolation device that includes a sliding plate and a sliding member that is horizontally slidable on the sliding plate. This seismic isolation device consists of a coolant pipe that is installed in contact with the sliding plate and circulates a coolant that absorbs heat from the sliding plate, and a coolant pipe that is installed in the coolant pipe to radiate the heat of the coolant. and a pump that circulates the coolant in the coolant piping.
Patent Document 2 discloses a laminated rubber type seismic isolation support installed between a building foundation and a building frame. This laminated rubber type seismic isolation bearing is equipped with a housing, and while supplying cooling liquid into the housing, the gas that has been vaporized by the cooling liquid is discharged outside the housing, thereby preventing the vaporization of the cooling liquid. The resulting heat absorption effect cools the laminated rubber type seismic isolation bearing.
Patent Document 3 discloses a sliding material unit that includes a holder in which a groove is formed, and a sliding material whose upper surface is fitted into the groove so as to face the bottom surface of the groove, and whose lower surface serves as a sliding surface. . The upper surface of the sliding member has a recessed portion, and the bottom surface of the groove has a protrusion formed to fit into the recessed portion along the shape of the recessed portion. According to this sliding material unit, it is possible to increase the contact area between the bottom surface of the groove and the top surface of the sliding material, compared to the case where there are no depressions and protrusions. Thereby, the frictional heat generated on the sliding surface of the sliding material can be efficiently transferred to the holder via the recess and the protrusion, so that it is possible to suppress the temperature of the sliding material from increasing.

Japanese Patent Application Publication No. 10-339053 JP 2017-160734 Publication JP 2019-19923 Publication

An object of the present invention is to provide a seismic isolation structure that can suppress the temperature rise of a seismic isolation device and stably exhibit seismic isolation performance when seismic motion acts on a building for a long time.

The seismic isolation structure of the first invention (e.g., seismic isolation structure 1, 1A to 1E described later) includes a seismic isolation device (e.g., seismic isolation device 2, described later) and a cooling device (e.g., , a cooling device 3, 3A to 3D (described later)), the seismic isolation device includes a sliding plate (for example, a sliding plate (described later)) provided on a lower foundation (for example, a lower foundation 4 described later). a sliding plate 10); and an elastic sliding bearing (for example, an elastic sliding bearing 20 described below) that is slidable on the sliding plate and supports an upper foundation (for example, an upper foundation 5 described later), The cooling device includes a coolant tank (for example, coolant tanks 30, 30A to 30D, to be described later) containing a coolant (for example, coolant C to be described later), and a coolant in the coolant tank to be seismically isolated. a cooling liquid supply mechanism (for example, cooling liquid supply mechanisms 31, 31A to 31E described below) that supplies the device to the apparatus, and the cooling liquid supply mechanism is configured such that the relative displacement between the elastic sliding bearing and the sliding plate is a predetermined value. or when frictional heat generated due to relative displacement between the elastic sliding bearing and the sliding plate exceeds a predetermined value, cooling liquid is supplied to the upper surface of the sliding plate. do.

According to this invention, when the relative displacement between the elastic sliding bearing and the sliding plate exceeds a predetermined value, or when the frictional heat generated due to the relative displacement between the elastic sliding bearing and the sliding plate exceeds a predetermined value. Then, coolant is supplied to the seismic isolation device. When cooling liquid is supplied to the top surface of the sliding plate, the frictional heat generated between the elastic sliding bearing and the sliding plate is absorbed by this cooling liquid, so the coefficient of friction between the elastic sliding bearing and the sliding plate decreases. The decline can be suppressed. Therefore, even if seismic motion acts on the building for a long time, the temperature rise of the seismic isolation device can be suppressed and the seismic isolation performance can be stably exhibited.

In the seismic isolation structure of the second invention, the cooling liquid supply mechanism (for example, the cooling liquid supply mechanism 31 described below) is arranged such that the cooling liquid supply pipe (for example, the cooling liquid supply mechanism 31 described below) extends from the cooling liquid tank to the top of the sliding plate. a supply pipe 40), a blocking material (for example, a blocking material 41 described below) provided in the coolant tank and blocking the coolant supply pipe, and connecting the blocking material and the sliding plate or the elastic sliding support. a connecting member (for example, a wire 42 described below), and when the relative movement between the sliding plate and the elastic sliding bearing exceeds a predetermined value, the connecting member pulls the closing member upward and cools it. The liquid is supplied to the upper surface of the sliding plate through the coolant supply pipe, or the coolant supply mechanism (for example, coolant supply mechanisms 31A, 31B, and 31C to be described later) has a through hole ( For example, a plugging material (e.g., a plugging material 52, described later) that closes a through hole 50 (described later), and a connecting material (e.g., a wire 53, described later) that connects the plugging material and the sliding plate or the elastic sliding support. , when the relative movement between the sliding plate and the elastic sliding bearing exceeds a predetermined value, the connecting member pulls the blocking material, the blocking material is removed, and the cooling liquid passes through the through hole. It is characterized in that it is supplied to the upper surface of the sliding plate.

According to this invention, due to the relative movement between the elastic sliding bearing and the sliding plate, the connecting member pulls the closing member upward, and the cooling liquid is supplied to the upper surface of the sliding plate through the cooling liquid supply pipe, or Due to the relative movement between the elastic sliding bearing and the sliding plate, the connecting member pulls the closing material, so that the closing material is removed and the cooling liquid is supplied to the upper surface of the sliding plate. Therefore, since the frictional heat of the sliding plate is absorbed by this coolant, it is possible to suppress a decrease in the coefficient of friction between the elastic sliding bearing and the sliding plate.

In the seismic isolation structure of the third aspect of the invention, the cooling liquid supply mechanism (for example, a cooling liquid supply mechanism 31D described below) is arranged such that the cooling liquid supply pipe (for example, a cooling liquid supply mechanism 31D described below) extends from the cooling liquid tank to the upper surface of the sliding plate. liquid supply pipe 60), a friction damper that reduces the relative movement of the elastic sliding bearing with respect to the sliding plate (e.g., friction damper 61 described below), and an on-off valve that closes the coolant supply pipe (e.g., on-off valve described below). 64), and a shape memory metal (e.g., a spring 65 described below) provided in contact with the friction damper and connected to the on-off valve, and the shape memory metal (for example, a spring 65 described below) is provided in contact with the friction damper, and the When heat is generated in the friction damper, the shape memory metal deforms and moves the on-off valve, and the coolant is supplied to the upper surface of the sliding plate through the coolant supply pipe, or the coolant supply mechanism a coolant supply pipe extending from the coolant tank to the upper surface of the sliding plate; a friction damper that reduces relative movement of the elastic sliding bearing with respect to the sliding plate; and a friction damper that blocks the coolant supply pipe and can be melted by heat. a fusible plug (for example, the fusible plug 70 described below), and when heat is generated in the friction damper due to relative movement between the elastic sliding bearing and the sliding plate, the fusible plug melts and cools. The liquid may be supplied to the upper surface of the sliding plate through the cooling liquid supply pipe.

According to this invention, when heat is generated in the friction damper due to the relative movement between the elastic sliding bearing and the sliding plate, the shape memory metal is deformed by the heat and moves the on-off valve, causing the cooling liquid to slide through the cooling liquid supply pipe. When heat is generated in the friction damper by being supplied to the top surface of the plate or due to relative movement between the elastic sliding bearing and the sliding plate, this heat melts the fusible plug and the coolant flows through the cooling liquid supply pipe to the sliding plate. is supplied to the top surface of the Therefore, since the frictional heat of the sliding plate is absorbed by this coolant, it is possible to suppress a decrease in the coefficient of friction between the elastic sliding bearing and the sliding plate.

According to the present invention, it is possible to provide a seismic isolation structure that can suppress the temperature rise of the seismic isolation device and stably exhibit seismic isolation performance when seismic motion acts on a building for a long time.

FIG. 1 is a schematic diagram of a seismic isolation structure according to a first embodiment of the present invention. FIG. 3 is a schematic diagram for explaining the operation of the seismic isolation structure according to the first embodiment. FIG. 3 is a side view of a test specimen used in a dynamic vibration test. FIG. 3 is a diagram showing test results of a dynamic vibration test. FIG. 3 is a diagram showing the relationship between the temperature of a sliding plate and the amount of energy absorbed per unit area of a sliding material. FIG. 3 is a diagram showing the relationship between the temperature of a sliding plate and the rate of change in coefficient of friction. FIG. 3 is a diagram showing an analytical model of a building used for time history response analysis. It is a figure which shows the analysis result of time history response analysis. It is a schematic diagram of the seismic isolation structure based on 2nd Embodiment of this invention. FIG. 7 is a schematic diagram for explaining the operation of the seismic isolation structure according to the second embodiment. It is a schematic diagram of the seismic isolation structure based on 3rd Embodiment of this invention. It is a schematic diagram for demonstrating the operation|movement of the seismic isolation structure based on 3rd Embodiment. It is a schematic diagram of the seismic isolation structure based on 4th Embodiment of this invention. It is a schematic diagram for demonstrating the operation|movement of the seismic isolation structure based on 4th Embodiment. It is a schematic diagram of the seismic isolation structure based on 5th Embodiment of this invention. It is a schematic diagram of the opening-and-closing mechanism which comprises the seismic isolation structure based on 5th Embodiment. It is a schematic diagram of the opening-and-closing mechanism which comprises the seismic isolation structure based on 6th Embodiment of this invention.

The present invention is a seismic isolation structure that includes a seismic isolation device and a cooling device that cools the seismic isolation device. The seismic isolation device includes a sliding plate provided on the lower foundation, and an elastic sliding support that is slidable on the sliding plate and supports the upper foundation. The cooling device causes cooling liquid to flow into the upper surface of the sliding plate when the relative displacement between the elastic sliding bearing and the sliding plate or the frictional heat generated due to the relative displacement between the elastic sliding bearing and the sliding plate exceeds a threshold value. to cool the seismic isolation device.
Embodiments of the present invention will be described below based on the drawings. In addition, in the following description of the embodiment, the same constituent elements are given the same reference numerals, and the description thereof will be omitted or simplified.
[First embodiment]
FIG. 1 is a schematic diagram of a seismic isolation structure 1 according to a first embodiment of the present invention.
The seismic isolation structure 1 includes a seismic isolation device 2 provided in a seismic isolation layer of a building, and a cooling device 3 that cools the seismic isolation device 2.
The seismic isolation device 2 is provided on a lower foundation 4 made of reinforced concrete and supports an upper foundation 5. This seismic isolation device 2 is a seismic isolation sliding bearing, and includes a sliding plate 10 provided on the lower foundation 4 and an elastic sliding bearing 20 that is slidable on the sliding plate 10 and supports the upper foundation 5. Be prepared.
The elastic sliding bearing 20 includes a sliding member 21 provided on the sliding plate 10, a lower steel plate 22 provided on the sliding member 21, a laminated rubber 23 provided on the lower steel plate 22, and a laminated rubber member 23 provided on the lower steel plate 22. and an upper steel plate 24 provided on the rubber 23.

The seismic isolation device 2 described above supports the upper foundation 5 from below by taking a reaction force to the lower foundation 4, while maintaining a state in which the upper foundation 5 is movable in the horizontal direction with respect to the lower foundation 4.
In the event of an earthquake, when a small seismic force is applied to the upper foundation 5, the laminated rubber 23 of the elastic sliding bearing 20 deforms and alleviates the seismic force, and when a large seismic force is applied, the elastic The sliding bearing 20 slides on the sliding plate 10 to alleviate the seismic force.

The cooling device 3 is provided on all sides of the elastic sliding bearing 20. This cooling device 3 includes a coolant tank 30 provided on the upper foundation 5 and containing a coolant C, a coolant supply mechanism 31 that supplies the coolant C in the coolant tank 30 to the seismic isolation device 2, Equipped with
The cooling liquid supply mechanism 31 supplies the cooling liquid C to the upper surface of the sliding plate 10 when the relative displacement between the elastic sliding bearing 20 and the sliding plate 10 exceeds a predetermined value. The coolant supply mechanism 31 includes a coolant supply pipe 40 that extends from the bottom of the coolant tank 30 to the top of the sliding plate 10, and a closing member 41 that is provided inside the coolant tank 30 and closes the coolant supply pipe 40 from above. , a wire 42 serving as a connecting member that is inserted into a through hole 43 provided in the upper part of the coolant tank 30 and connects the closing member 41 and the sliding plate 10.

In this cooling liquid supply mechanism 31, as shown in FIG. pull upwards. Thereby, the cooling liquid C is supplied to the upper surface of the sliding plate 10 through the cooling liquid supply pipe 40, and the cooling liquid C absorbs the frictional heat between the elastic sliding bearing 20 and the sliding plate 10. Here, the above-mentioned displacement amount threshold is, for example, 200 mm in the case of an elastic sliding bearing with an outer diameter of 800 mm. In addition, for the coolant C, use water with a boiling point of 100°C, or a high-performance liquid hydrofluoroether liquid with a boiling point lower than water, nonflammability, and no flash point (for example, NoVec700 manufactured by 3M Japan Co., Ltd.). do.
Note that the predetermined value of the relative movement between the sliding plate 10 and the elastic sliding bearing 20 is appropriately set by adjusting the length of the wire 42.

Further, the sliding plate 10 is provided with an outer peripheral wall 11 along the outer periphery, and a drain pipe 12 communicating with the outside is provided at a predetermined height of the outer peripheral wall 11. When the cooling liquid C is supplied to the upper surface of the sliding plate 10, this cooling liquid C accumulates inside the outer peripheral wall 11, but when the water surface of the cooling liquid C reaches the height of the drain pipe 12, the cooling liquid C stops cooling. Liquid C is discharged to the outside through this drain pipe 12.

[Past dynamic vibration test]
Existing dynamic vibration tests for elastic sliding bearings will be explained below.
Existing dynamic vibration tests are shown in the following documents: Research on the multiple repetition characteristics of seismic isolation members and their influence on seismic response characteristics of seismic isolation buildings, Part III Characteristic evaluation and response evaluation of seismic isolation members, Architectural Research Materials, No. 170, (Kokukai) Architectural Research (April 2016).
FIG. 3 is a side view of a test specimen used in a past dynamic vibration test. This test specimen is a seismically isolated sliding bearing with a sliding plate placed on top of an elastic sliding bearing. A load of 5000 kN (surface pressure 10 N/mm ² ) was applied to this test specimen, and in this state, the elastic sliding bearing was vibrated for a total of 7 cycles, each cycle consisting of 5 vibrations with an amplitude of 400 mm.
FIG. 4 shows the test results of the dynamic vibration test. From FIG. 4, it can be seen that in each cycle, as the number of excitations increases, the friction coefficient decreases. It is also seen that as the number of cycles increases, the overall friction coefficient decreases. 5 and 6 formulate the temperature dependence of the friction coefficient based on the results of this test. FIG. 5 is a diagram showing the relationship between the temperature of the sliding plate and the amount of energy absorbed per unit area of the sliding material. FIG. 6 is a diagram showing the relationship between the temperature of the sliding plate and the rate of change in the coefficient of friction. In FIG. 6, a property is formulated in which the friction coefficient decreases as the temperature of the sliding plate increases.
As described above, an evaluation formula for the repetition dependence of seismic isolation materials constituting a seismic isolation device when earthquake loads are applied over a long period of time (many times) has been proposed.

[Time history response analysis]
Next, a time history response analysis was performed when the elastic sliding bearing was subjected to repeated vibrations many times. Specifically, a seismic isolation sliding bearing was modeled, and this seismic isolation sliding bearing model was repeatedly excited many times to determine the maximum relative displacement between the elastic sliding bearing and the sliding plate.
FIG. 7 is a diagram showing an analytical model of a building used for time history response analysis. This analytical model is a building modeled using one mass point system parameter. In this building, laminated rubber (elastic bearings) and seismic isolation sliding bearings are placed on the foundation, and the building body is supported by these laminated rubber and seismic isolation sliding bearings.
Specifically, the mass of the building body is 53,960 t, 38,650 t, which is 70% of the mass of the building body, is supported by laminated rubber, and 15,300 t, which is 30% of the mass of the building body, is supported by seismic isolation sliding bearings. And so. In addition, the natural period of the building was 2.1 seconds before sliding, 6.0 seconds after sliding, and 4.7 seconds (equivalent period) at the time of 40 cm displacement. Further, the yield base shear Ci was 0.032, the friction coefficient μ was 0.112, and the damping constant h was 0%. The seismic waves to be input were a base wave CH1 and a base wave OS1.

FIG. 8 is a diagram showing the analysis results of time history response analysis. "No temperature dependence" in FIG. 8 is the moving distance on the sliding plate of the elastic sliding bearing when the frictional heat between the sliding plate of the seismic isolation sliding bearing and the elastic sliding bearing is not considered. On the other hand, "temperature dependent" is the moving distance on the sliding plate of the elastic sliding bearing when the frictional heat between the sliding plate of the seismic isolation sliding bearing and the elastic sliding bearing is considered. It can be seen that in the case of ``with temperature dependence'', the moving distance of the elastic sliding bearing is longer because the coefficient of friction is lower due to frictional heat than in the case of ``without temperature dependence''. Furthermore, in the case of "temperature dependence", it was confirmed that the temperature on the sliding plate reached 300°C or higher.

According to this embodiment, there are the following effects.
(1) When the relative displacement between the elastic sliding bearing 20 and the sliding plate 10 exceeds a predetermined value, the cooling liquid C is supplied to the seismic isolation device 2. When the cooling liquid C is supplied to the upper surface of the sliding plate 10, the frictional heat generated between the elastic sliding bearing 20 and the sliding plate 10 is absorbed by the cooling liquid C, so that the elastic sliding bearing 20 and the sliding plate 10 It is possible to suppress the decrease in the coefficient of friction between the Therefore, even when seismic motion acts on the building for a long time, the temperature rise of the seismic isolation device 2 can be suppressed and the seismic isolation performance can be stably exhibited.

(2) Due to the relative movement between the elastic sliding bearing 20 and the sliding plate 10, the wire 42 pulls up the closing material 41, so that the coolant C is supplied to the upper surface of the sliding plate 10 through the cooling liquid supply pipe 40. . Therefore, since the frictional heat of the sliding plate 10 is absorbed by the coolant C, a decrease in the coefficient of friction between the elastic sliding bearing 20 and the sliding plate 10 can be suppressed.

[Second embodiment]
FIG. 9 is a schematic diagram of a seismic isolation structure 1A according to a second embodiment of the present invention.
In this embodiment, the configuration of the cooling device 3A is different from the first embodiment.
The cooling device 3A includes a coolant tank 30A provided on the upper foundation 5 and containing a coolant C, and a coolant supply mechanism 31A that supplies the coolant C in the coolant tank 30A to the seismic isolation device 2. Be prepared.
A through hole 50 is provided on the lower surface of the coolant tank 30A, and a guide plate 51 is provided for guiding the coolant C flowing downward through the through hole 50 onto the sliding plate 10.

The coolant supply mechanism 31A includes a blocker 52 that closes the through hole 50 on the bottom of the coolant tank 30, and a wire 53 as a connecting member of a predetermined length that connects the blocker 52 and the lower foundation 4 on the sliding plate 10 side. and. In the coolant supply mechanism 31A, as shown in FIG. 10, when the relative movement between the sliding plate 10 and the elastic sliding bearing 20 exceeds a predetermined value, the wire 53 pulls the closing material 52 downward, so that the closing material 52 is removed. When removed, the coolant C flows downward through the through hole 50 of the coolant tank 30, flows over the upper surface of the guide plate 51, and is supplied to the upper surface of the sliding plate 10. Here, the predetermined value of the relative movement between the sliding plate 10 and the elastic sliding bearing 20 is appropriately set by adjusting the length of the wire 53.
Note that in this embodiment, one end of the wire 53 is connected to the lower foundation 4, but the present invention is not limited to this, and the lower foundation 4 can be provided with a drum that winds up with a biasing force, and one end of the wire 53 can be connected to this drum. It's okay. In this case, when the unwinding length of the drum exceeds a predetermined length, the unwinding is locked.
According to this embodiment, the same effects as (1) and (2) described above can be obtained.

[Third embodiment]
FIG. 11 is a schematic diagram of a seismic isolation structure 1B according to a third embodiment of the present invention.
In this embodiment, the configuration of the cooling device 3B is different from the first embodiment.
The cooling device 3A includes a coolant tank 30B provided on the lower foundation 4 and containing a coolant C, a coolant supply mechanism 31B that supplies the coolant C in the coolant tank 30B to the seismic isolation device 2, Equipped with
A through hole 50 is provided on the side surface of the coolant tank 30B, and a guide plate 51 is provided for guiding the coolant C flowing laterally through the through hole 50 onto the sliding plate 10.

The coolant supply mechanism 31B includes a blocker 52 that closes the through hole 50 on the side surface of the coolant tank 30, and a wire serving as a connecting member of a predetermined length that connects the blocker 52 and the upper foundation 5 on the elastic sliding support 20 side. 53. In the coolant supply mechanism 31B, as shown in FIG. 12, when the relative movement between the sliding plate 10 and the elastic sliding bearing 20 exceeds a predetermined value, the wire 53 pulls the closing material 52 laterally, so that the closing material 52 is removed. is removed, the coolant C flows out to the side through the through hole 50 of the coolant tank 30, flows over the upper surface of the guide plate 51, and is supplied to the upper surface of the sliding plate 10. Here, the predetermined value of the relative movement between the sliding plate 10 and the elastic sliding bearing 20 is appropriately set by adjusting the length of the wire 53.
In the present embodiment, one end of the wire 53 is connected to the upper foundation 5, but the present invention is not limited to this, and the upper foundation 5 may be provided with a drum that winds up with a biasing force, and one end of the wire 53 can be connected to this drum. It's okay. In this case, when the unwinding length of the drum exceeds a predetermined length, the unwinding is locked.
According to this embodiment, the same effects as (1) and (2) described above can be obtained.

[Fourth embodiment]
FIG. 13 is a schematic diagram of a seismic isolation structure 1C according to the fourth embodiment of the present invention.
In this embodiment, the configuration of the cooling device 3C is different from the first embodiment.
The cooling device 3C includes a coolant tank 30C provided on the lower foundation 4 and containing the coolant C, a coolant supply mechanism 31C that supplies the coolant C in the coolant tank 30C to the seismic isolation device 2, Equipped with
A through hole 50 is provided at the bottom of the coolant tank 30B, and a guide plate 51 is provided for guiding the coolant C flowing downward through the through hole 50 onto the sliding plate 10.

The coolant supply mechanism 31C includes a blocker 52 that closes the through hole 50 on the lower surface of the coolant tank 30, and a wire serving as a connecting member of a predetermined length that connects the blocker 52 and the upper foundation 5 on the elastic sliding support 20 side. 53. In the coolant supply mechanism 31C, as shown in FIG. 14, when the relative movement between the slide plate 10 and the elastic slide support 20 exceeds a predetermined value, the wire 53 pulls the occluder 52 laterally. is removed, the coolant C flows downward through the through hole 50 of the coolant tank 30, flows over the upper surface of the guide plate 51, and is supplied to the upper surface of the sliding plate 10. Here, the predetermined value of the relative movement between the sliding plate 10 and the elastic sliding bearing 20 is appropriately set by adjusting the length of the wire 53.
In the present embodiment, one end of the wire 53 is connected to the upper foundation 5, but the present invention is not limited to this, and the upper foundation 5 may be provided with a drum that winds up with a biasing force, and one end of the wire 53 can be connected to this drum. It's okay. In this case, when the unwinding length of the drum exceeds a predetermined length, the unwinding is locked.
According to this embodiment, the same effects as (1) and (2) described above can be obtained.

[Fifth embodiment]
FIG. 15 is a schematic diagram of a seismic isolation structure 1D according to a fifth embodiment of the present invention.
In this embodiment, the configuration of the cooling device 3D is different from the first embodiment.
The cooling device 3D includes a coolant tank 30D provided on the lower foundation 4 and containing a coolant C, a coolant supply mechanism 31D that supplies the coolant C in the coolant tank 30D to the seismic isolation device 2, Equipped with
The cooling liquid supply mechanism 31D supplies the cooling liquid C to the upper surface of the sliding plate 10 when the frictional heat generated due to the relative displacement between the elastic sliding bearing 20 and the sliding plate 10 exceeds a predetermined value. . This coolant supply mechanism 31D is provided with a coolant supply pipe 60 extending from the bottom of the coolant tank 30 to above the slide plate 10 and on the lower foundation 4 to reduce relative movement of the elastic slide support 20 with respect to the slide plate 10. A friction damper 61 and an opening/closing mechanism 62 provided on the friction damper 61 to open and close the coolant supply pipe 60 are provided.

FIG. 16(a) is a schematic diagram showing the configuration of the opening/closing mechanism 62.
The opening/closing mechanism 62 includes an on-off valve accommodating part 63 which is a space extending in a direction intersecting the coolant supply pipe 60, and an on-off valve 64 that is movably accommodated in the on-off valve accommodating part 63 and closes the coolant supply pipe 60. and a pair of springs 65 and 66 that are accommodated in the on-off valve accommodating portion 63 and bias the on-off valve 64 from both sides. The spring 65 is formed of a shape memory metal whose biasing force decreases when the temperature rises to a predetermined temperature (transformation point) or higher, and is provided in contact with the friction damper 61. Specifically, for example, the spring 65 is made of a Ni--Ti alloy whose rigidity changes with heat, and the spring 66 is made of an elastic spring such as a steel coil spring.

The friction damper 61 includes a cylinder (not shown) and a piston rod 67 housed in the cylinder. The piston rod 67 is connected to the upper foundation 5.
In this coolant supply mechanism 31D, due to the relative displacement between the elastic sliding bearing 20 and the sliding plate 10, the piston rod 67 and the cylinder slide, and frictional heat is generated. Then, as shown in FIG. 16(b), this frictional heat is transmitted to the spring 65 of the opening/closing mechanism 62, the biasing force of the spring 65 is reduced, the opening/closing valve 64 moves, and the coolant supply pipe 60 is opened. be done. Thereby, the coolant C is supplied to the upper surface of the sliding plate 10 through the coolant supply pipe 60.
According to this embodiment, in addition to the effect (1) described above, there are the following effects.

(3) When heat is generated in the friction damper 61 due to the relative movement between the elastic sliding bearing 20 and the sliding plate 10, the spring 65 is deformed by this heat and moves the on-off valve 64, causing the cooling liquid to flow through the cooling liquid supply pipe 60. is supplied to the upper surface of the sliding plate 10. Therefore, since the frictional heat of the sliding plate 10 is absorbed by the coolant C, a decrease in the coefficient of friction between the elastic sliding bearing 20 and the sliding plate 10 can be suppressed.

[Sixth embodiment]
FIG. 17(a) is a schematic diagram of an opening/closing mechanism 62E of a seismic isolation structure 1E according to a sixth embodiment of the present invention.
In this embodiment, the configuration of the opening/closing mechanism 62E is different from that in the fifth embodiment.
The opening/closing mechanism 62E includes a cylindrical fusible plug 70 that closes the coolant supply pipe 60. A through hole 71 is formed inside this fusible plug 70, and this through hole 71 is filled with a metal 72 having a low melting point. Specifically, the metal 72 with a low melting point is a fusible plug alloy containing Zn, Bi, and In, and for example, there is a RoHS-compliant fusible plug using a fusible alloy manufactured by Senju Sprinkler Co., Ltd. In this case, the melting point of the fusible plug 70 is 50°C to 100°C.
In this opening/closing mechanism 62E, due to the relative displacement between the elastic sliding bearing 20 and the sliding plate 10, the piston rod 67 and the cylinder slide, and frictional heat is generated. Then, as shown in FIG. 17(b), this frictional heat is transmitted to the fusible plug 70 of the opening/closing mechanism 62E, the metal 72 of the fusible plug 70 melts, and the coolant supply pipe 60 is opened. Thereby, the coolant C is supplied to the upper surface of the sliding plate 10 through the coolant supply pipe 60.
According to this embodiment, the same effects as (1) and (3) described above can be obtained.

Note that the present invention is not limited to the above-described embodiments, and any modifications, improvements, etc. that can achieve the purpose of the present invention are included in the present invention.

1, 1A, 1B, 1C, 1D, 1E...Seismic isolation structure 2...Seismic isolation device 3, 3A, 3B, 3C, 3D...Cooling device 4...Lower foundation 5...Upper foundation 10...Sliding plate 11...Outer peripheral wall 12... Drain pipe 20...Elastic sliding support 21...Sliding material 22...Lower steel plate 23...Laminated rubber 24...Upper steel plate 30, 30A, 30B, 30C, 30D...Cooling liquid tank 31, 31A, 31B, 31C, 31D...Cooling liquid supply mechanism 40...Cooling liquid supply pipe 41...Closing material 42...Wire (connecting material)
50...Through hole 51...Guiding plate 52...Closing material 53...Wire (connecting material)
60...Cooling liquid supply pipe 61...Friction damper 62, 62E...Opening/closing mechanism 63...Opening/closing valve accommodating part 64...Opening/closing valve 65...Spring 66...Spring (shape memory metal) 67...Piston rod 70...Fusible plug 71...Through hole 72...Metal with low melting point C...Cooling liquid

Claims (3)

A seismic isolation structure comprising a seismic isolation device and a cooling device that cools the seismic isolation device,
The seismic isolation device includes a sliding plate provided on the lower foundation, and an elastic sliding bearing that is slidable on the sliding plate and supports the upper foundation,
The cooling device includes a coolant tank containing a coolant, and a coolant supply mechanism that supplies the coolant in the coolant tank to the seismic isolation device,
The cooling liquid supply mechanism is configured to reduce frictional heat generated when the relative displacement between the elastic sliding bearing and the sliding plate exceeds a predetermined value, or due to the relative displacement between the elastic sliding bearing and the sliding plate to a predetermined value. A seismic isolation structure characterized by supplying cooling liquid to the upper surface of the sliding plate when the value exceeds the value. The coolant supply mechanism includes a coolant supply pipe extending from the coolant tank to above the sliding plate, a blocking material provided in the coolant tank and blocking the coolant supply pipe, and a connecting member between the blocking material and the sliding plate. a connecting member that connects the plate or the elastic sliding bearing, and when the relative movement between the sliding plate and the elastic sliding bearing exceeds a predetermined value, the connecting member pulls the closing material upward, A cooling liquid is supplied to the upper surface of the sliding plate through the cooling liquid supply pipe.
Alternatively, the coolant supply mechanism includes a closing member that closes a through hole in the bottom of the coolant tank, and a connecting member that connects the closing member and the sliding plate or the elastic sliding support, and the sliding plate When the relative movement between the and the elastic sliding bearing exceeds a predetermined value, the connecting member pulls the closing member downward, the closing member is removed, and the cooling liquid flows through the through hole and onto the upper surface of the sliding plate. The seismic isolation structure according to claim 1, wherein the seismic isolation structure is supplied to a. The coolant supply mechanism includes a coolant supply pipe extending from the coolant tank to the upper surface of the sliding plate, a friction damper that reduces relative movement of the elastic sliding bearing with respect to the sliding plate, and blocking the coolant supply pipe. comprising an on-off valve and a shape memory metal provided in contact with the friction damper and connected to the on-off valve, and when heat is generated in the friction damper due to relative movement between the elastic sliding bearing and the sliding plate, The shape memory metal deforms and moves the on-off valve, and the coolant is supplied to the upper surface of the sliding plate through the coolant supply pipe.
Alternatively, the coolant supply mechanism includes a coolant supply pipe extending from the coolant tank to the upper surface of the sliding plate, a friction damper that reduces relative movement of the elastic sliding bearing with respect to the sliding plate, and the coolant supply pipe. and a fusible plug that can be melted by heat by blocking the elastic sliding bearing, and when heat is generated in the friction damper due to relative movement between the elastic sliding bearing and the sliding plate, the fusible plug melts and the cooling liquid flows out. The seismic isolation structure according to claim 1, wherein the cooling liquid is supplied to the upper surface of the sliding plate through the cooling liquid supply pipe.

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