JPH0146676B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a building seismic isolation device for the purpose of reducing seismic forces acting on a building. In order to build a building that is safe against earthquakes, the framework of the building, such as columns, beams, floor plates, and walls, must be made strong so that the building will not be destroyed or significantly deformed even when subjected to earthquake forces. There is a so-called method of building a building with an earthquake-resistant structure, and a method of installing a seismic isolation device on the building to reduce the seismic force acting on the structure itself, which is a method of making the building a seismic-isolated structure.

Seismic isolation structures have the following advantages over earthquake-resistant structures. (1) The cross sections of structural members such as columns, beams, and foundations can be small, eliminating the need for earthquake-resistant walls;
Significant savings can be made in building materials such as concrete.
(2) Since the stress acting on the joints of structural members is small, prefabricated construction methods using reinforced concrete members become easier, and modern production methods that assemble factory-produced components at construction sites can be promoted. (3) Since the horizontal acceleration that acts on the building during an earthquake is small, indoor furniture is prevented from falling over or being moved, and residents' feelings of anxiety are also reduced.

The present invention is an improvement on the invention "Natural Period Variation Type Seismic Isolation Device" (hereinafter simply referred to as the original invention or the seismic isolation device of the original invention) disclosed in Japanese Patent Publication No. 58-91247.

Embodiment 2 of the original invention is configured as follows. A truncated conical cylindrical first floating body, a truncated conical cylindrical second floating body, and a truncated conical cylindrical body inside the truncated conical cylindrical support fixed on the foundation. The support legs attached in the shape of a hook are housed in a nested manner with a space between them, and a plurality of hanging members are used to support the first floating body as a support base and the second floating body as a first floating body. The legs are each attached to the second floating body to form a support device. A support leg side displacement restraint device for controlling horizontal relative displacement of the support leg with respect to the first floating body is formed as follows. A cylindrical sliding body having a conical concave surface on the lower surface is inserted into the cylindrical body of the support leg, and the cylindrical sliding body is placed on the conical convex surface formed on the upper surface of the bottom plate of the first floating body. A cylindrical buckling deformation device holding part whose lower part is connected to a cylindrical sliding body is housed in a hollow part provided from the floor plate of the superstructure to the bottom of the column, and a cylindrical buckling deformation device holding part is housed in the hollow part provided from the floor plate of the superstructure to the bottom of the column. Install the upper buckling deformation device. The upper buckling deformation device consists of two laminated bodies with a buckling restraint device and an adjustment device with a solenoid valve controlled by a microcomputer, which are arranged in series via a connecting plate. The stack is placed on the partition plate, and the uppermost adjustment device is connected to the hollow ceiling of the column. The laminate is formed by stacking a number of slightly curved rectangular thin metal plates in the shape of a cylindrical shell. The buckling restraint device is formed by a rubber covering that seals the laminate, a vacuum tank equipped with a vacuum pump, and a communication pipe that connects the two.
The rubber sheath and the communication tube are each provided with a solenoid valve controlled by a microcomputer.

A support stand-side displacement restraint device for controlling the horizontal relative displacement of the first movable body with respect to the support stand is formed as follows. A sliding body having a conical convex surface on the lower surface is inserted into the sliding body holding portion of the first floating body bottom plate, and the sliding body is placed on the conical concave surface formed on the upper surface of the base. A lower buckling deformation device is attached to the lower part of the partition plate of the buckling deformation device holding part, and the lower buckling deformation device and the sliding body are connected by a connecting link. The lower buckling deformation device is
The two laminates formed as described above and the adjustment device are arranged in series via a connecting plate, the lowest connecting plate supporting the laminates being connected to the connecting pin,
The top adjustment device is connected to the partition plate.

The microcomputer control unit includes a displacement detector that detects horizontal relative displacement of the support leg with respect to the support base, and a buckling detector that detects buckling of the laminate.

The functions and effects of the seismic isolation device of the original invention are as follows.

(1) When the seismic isolation device does not operate When horizontal shear force is applied to the seismic isolation device, the cylindrical sliding body and the sliding body receive an upward force. Therefore, an axial compressive force acts on the laminate of the upper buckling deformation device (hereinafter simply referred to as the upper laminate) and the laminate of the lower buckling deformation device (hereinafter simply referred to as the lower laminate). If the horizontal shear force acting on the seismic device does not reach the operating shear force, neither the upper laminate nor the lower laminate undergoes buckling deformation. As a result, the cylindrical sliding body and the sliding body cannot move upward and continue to restrain the deformation of the seismic isolation device.
No relative horizontal displacement occurs between the superstructure and the foundation in the case of a minor earthquake or when wind pressure is applied.

(2) Activation of the seismic isolation device and long-period seismic isolation operation When an earthquake occurs that activates the seismic isolation device, the cylindrical sliding body and the sliding body receive an upward force due to the horizontal shear force acting on the seismic isolation device. An axial compressive force acts on the upper and lower laminates. This axial compressive force buckles and deforms the upper laminated body, so the buckling deformation device holding part, the cylindrical sliding body, and the sliding body move upward together, and the support leg and the first floating body move upward. A relative displacement is caused in the horizontal direction with respect to the support base. In this way, when the seismic isolation device operates, the superstructure is separated from the foundation and undergoes its own long-period vibration, which greatly reduces the horizontal seismic force acting on the superstructure.

(3) Short-period seismic isolation operation and avoidance of resonance When the seismic isolation device operates, the microcomputer control unit starts monitoring the relative horizontal displacement of the support leg with respect to the support base based on information from the displacement detector. When the horizontal relative displacement gradually increases and signs of resonance appear in the seismic isolation device, the microcomputer control section opens the solenoid valve of the adjustment device to encourage the upper laminate to recover, and also opens the solenoid valve of the communication pipe to release the rubber. This reduces the air pressure inside the cladding and restrains the buckling deformation of the upper laminate. In this state, when an axial compressive force acts on the upper laminate and the lower laminate, the upper laminate does not undergo buckling deformation, but the lower laminate undergoes buckling deformation. As a result, the sliding body moves upward and the cylindrical sliding body is prevented from moving upward, so that the seismic isolation device includes the first floating body,
The second movable body and the support leg together enter a short-period seismic isolation operation in which they are displaced relative to the support base in the horizontal direction, and resonance induced by long-period vibration is avoided. If signs of resonance appear in the seismic isolation device during short-period seismic isolation operation, the microcomputer control unit releases the buckling restraint of the upper laminate and switches the seismic isolation device to the aforementioned long-period seismic isolation operation. Avoid resonance due to periodic vibrations. The seismic isolation device of the original invention thus performs seismic isolation while avoiding resonance by converting the natural period of the seismic isolation device from a long period to a short period or from a short period to a long period.

The drawback of the seismic isolation device of the original invention is that the main control devices such as the laminate, buckling restraint device, adjustment device, etc. are installed in a closed and narrow space such as inside the support device or in the hollow part of the column of the superstructure. This is what is happening. Maintenance and inspection work on these devices is carried out through the inspection port in the pillar, but since it is structurally undesirable to make the inspection port large, inspection and other work is not easy.

In order to eliminate the drawbacks of the original invention, the present invention makes the seismic isolation device vertically long, provides the main control device at the bottom of the support device, and provides a work space around it so that workers can access the inside of the seismic isolation device. Enabled to perform entry work.

Examples of the invention are as follows. FIG. 1 is a vertical cross-sectional view showing the seismic isolation device of the present invention, and a part of the foundation and superstructure. The support device of the seismic isolation device of the present invention is composed of a support base 1, a first suspension member 2, a floating body 3, a second suspension member 4, and support legs 5. The foundation 6 is made of reinforced concrete and has foundation beams set up on a foundation plate. Support stand 1
is a cylindrical body made of reinforced concrete with a ring-shaped thick steel plate 7 for attaching a hanging material to the upper edge thereof, and is fixed to the foundation 6 by PC steel rods 8. The floating body 3 is a cylindrical body made of steel, and has annular ribs 9 for attaching hanging members at the upper and lower edges, and four conical convex bodies B10 made of steel at the bottom. The floating body 3 is suspended on the support base 1 by a plurality of first hanging members 2. 1st hanging material 2
is formed by an elongated ring made of a high-strength round steel bar and two U-bolts 11, and its upper end is connected to the annular thick steel plate 7 on the upper part of the support base 1, as shown in FIG. 1 or 2.
The lower ends are respectively connected to the annular ribs 9 at the bottom of the floating body 3. The support leg 5 is made of steel, and has a structure in which an upper support leg 12 and a lower support leg 13 are connected by bolts for convenience of assembly. Lower support leg 13
has a cylindrical shape, and is provided with an annular rib 14 for attaching a hanging member and a conical concave plate A15 made of steel at the bottom. The upper support leg 12 is formed of a cylindrical body and a reinforcing steel material, and is provided with a flange 16 for attaching a floor plate part at the upper part, and a buffer material 17 at the middle part. The support leg 5 is suspended from the floating body 3 by a plurality of second hanging members 4, and the floor plate portion 18 of the upper structure is attached to the upper part of the support leg 5.
is placed. The second suspension member 4 is formed by an elongated ring made of a high-strength round steel bar and two U-bolts 19, and as shown in FIGS. 9, the lower ends are connected to the annular ribs 14 at the bottom of the support legs 5, respectively. The floor plate portion 18 of the superstructure is fixed to the flange 16 of the support leg 5 using bolts and PC steel rods 20.

The shear force conversion device of the seismic isolation device of the present invention is formed as follows. As shown in FIGS. 1 and 2, a guide 21 made of steel pipes is fixed to a support base 1, and conical convex bodies A22 and 4 are attached to the guide 21.
The base conical concave plate B23 is attached so that it can slide up and down. The conical convex body A22 is installed opposite to the conical concave plate A15 of the support leg 5, and the conical concave plate B23 is installed opposite to the conical convex body B10 of the floating body 3. The surfaces are formed in close contact.

As shown in FIGS. 1, 3, and 4, the hydraulic cylinder device is composed of a cylinder A 24, four cylinders B 25, a hydraulic valve device 26, an oil tank 27, and a pipe connecting these. Ru. The hydraulic valve device 26 is mounted on a mounting base 28 that is formed so that an operator can pass through it. The cylinder A24 is installed vertically in the upper center of the hydraulic valve device 26, and the valve cylinder A29 of the hydraulic valve device 26
connected to. Cylinder A24 and oil tank 27
are connected by a pipe 31 equipped with a check valve A30 and a pipe 33 equipped with an electromagnetic switching valve A32. The piston 34 of the cylinder A24 is connected to the conical convex body A22. The conical convex body A22 is pushed upward by the coil spring 35 and the support leg 5
It is in close contact with the conical concave disk A15. The four cylinders B25 are installed vertically on a steel support beam 36,
It is connected by a pipe 37 to a valve cylinder B38 of the hydraulic valve device 26. In addition, two valve cylinders B
38 are connected by a communication pipe 39. Each piston 4 of the cylinder B25 is a conical concave disk B
23. The concave concave disc B23 is pushed upward by the coil spring 41 and comes into close contact with the conical convex disc B10 of the floating body 3. FIG. 5 is an enlarged sectional view of the hydraulic valve device 26. As shown in FIG. The hydraulic valve device 26 includes a central valve cylinder A29, left and right valve cylinders B38, an upper pressure plate 42, a middle pressure plate 43, a lower pressure plate 44, a laminate 45, a laminate 46, and two buckling restraint devices. 47. The valve cylinder A29 is provided with an outlet 48 and connected to an outlet passage 49. The outflow path 49 is connected to the oil tank 27 by a pipe 50. A valve piston 51 for opening and closing the outlet 48 is inserted into the valve cylinder A29. The valve cylinder B38 is provided with an outlet 52 and connected to an outlet passage 53. The outflow path 53 is connected to the oil tank 27 by a pipe 54. Note that the valve cylinder B38 and the oil tank 27 are connected by a pipe 56 equipped with a check valve B55, and the communication pipe 3
9 and the oil tank 27 are connected by a pipe 58 equipped with an electromagnetic switching valve B57. Valve cylinder B3
A valve piston 59 for opening and closing the outlet 52 is inserted in the valve 8 . The upper pressure plate 42 is the valve cylinder A2
9 is connected to the valve piston 51 of the guide rail 6.
It is designed to move parallel up and down along 0. The intermediate pressure plate 43 is connected to the valve piston 59 of the valve cylinder B38, and is configured to move vertically in parallel along the guide rail 61. Lower pressure plate 4
4 is fixed to the bottom plate of the hydraulic valve device 26. The upper pressure plate 42 is provided with two deformation limiting devices 62, and the middle pressure plate 43 is provided with a deformation limiting device 63. Laminated body 45 and laminated body 4
6 is formed by stacking a number of slightly curved rectangular thin metal plates in the shape of a cylindrical shell. The stacked body 45 is placed between the upper pressure plate 42 and the middle pressure plate 43 with the cylindrical axis vertical, and is held by the pressure plate holding device. The stacked body 46 is placed between the middle pressure plate 43 and the lower pressure plate 44 with the cylindrical axis vertical, and is held by the pressure plate holding device. The buckling restraint devices 47 installed on each side of the laminated body 46 include a truck 64 formed to be movable on the bottom plate of the hydraulic valve device 26, an expandable support body 65 attached to the truck 64, and a truck. It is constituted by a solenoid 66 that moves 64. The extensible support body 65 was formed so as to be in close contact with the curved surface of the laminate 46.
It is made of more than 10 light metal plates polymerized with springs in between, allowing it to expand and contract in the vertical direction. The solenoid 66 is installed on a pedestal fixed to the side plate of the hydraulic valve device 26, and operates the plunger to move the carriage 64 in response to a command from the computer control section. The expandable support body 65 is normally held at a position away from the plate surface of the laminate 46, but
When the solenoid 66 is energized, it comes into close contact with the plate surface of the laminate 46.

The computer control section includes a displacement detector that detects the relative horizontal displacement of the support leg 5 with respect to the support base 1.

The seismic isolation device of the present invention is installed under each column or main wall of the superstructure. The lower structures such as walls and stairs that are integrally formed with the foundation 6 and the floor plate portion 18 of the upper structure are constructed so as not to hinder relative horizontal displacement between the two.

The functions and effects of the seismic isolation device of the present invention are as follows.

(1) When the seismic isolation devices do not operate When seismic force or wind pressure acts on the superstructure, horizontal shearing force acts on each seismic isolation device, and the support legs 5 tend to displace relative to the support base 1 in the horizontal direction. shall be. Due to this action, the concave concave disc A15 of the support leg 5 applies a downward force to the convex conical body A22. At this time, since the outlet 48 of the valve cylinder A29, the check valve A30, and the electromagnetic switching valve A32 are all closed, the valve piston 51 is pushed by the hydraulic pressure generated in the cylinder A24.
An axial compressive force acts on the laminated body 45 and the laminated body 46. However, when the horizontal shear force acting on the seismic isolation device is smaller than the operating shear force, the axial compressive force acting on the laminate is smaller than the buckling load of the laminate 45 or the laminate 46. 46 does not undergo buckling deformation. For this reason, the outlet 48 of the valve cylinder A29 continues to be closed by the valve piston 51, and the conical convex body A22 is prevented from descending. As a result, the horizontal relative displacement of the support leg 5 with respect to the support platform 1 is restrained, so no horizontal relative displacement will occur between the superstructure and the foundation in the case of a slight earthquake or when wind pressure acts. .

(2) Operation of the seismic isolation device and long-period seismic isolation operation Figure 6 is a longitudinal sectional view showing the long-period seismic isolation operation of the seismic isolation device. When an earthquake occurs and a horizontal shearing force as shown by the arrow acts on the seismic isolation device, a downward force acts on the conical concave body A22, causing the laminated body 45
And an axial compressive force acts on the laminate 46. Since the buckling load of the laminate 46 is smaller than the buckling load of the laminate 45, when the horizontal shear force acting on the seismic isolation device reaches the operating shear force, the axial compressive force causes the laminate 46 to buckle. transform. Due to the buckling deformation of the laminate 46, the valve piston 51 of the valve cylinder A29, the upper pressure plate 42,
The stacked body 45, the intermediate pressure plate 43, and the valve piston 59 of the valve cylinder B38 move downward together, and the outlet 48 of the valve cylinder A29 and the outlet 52 of the valve cylinder B38 are simultaneously opened. As a result, a flow occurs in the hydraulic oil in the cylinder A24 and the hydraulic oil in the cylinder B25, causing the conical convex body A22 and the conical concave disc B2 to flow.
3 is released from the restraint and moves downward, supporting leg 5
And the floating body 3 causes a relative displacement in the horizontal direction with respect to the support base 1. When hydraulic oil flows out from the outlet 48 of the valve cylinder A29 and the hydraulic pressure acting on the valve piston 51 decreases, the stacked body 46 is moved to the middle pressure plate 43, the valve piston 59, the stacked body 45, the upper pressure plate 42, and the valve piston 51. is pushed up to return to its original shape, and the outlet port 4 of the valve cylinder A29
8, and the outlet 52 of the valve cylinder B38 is closed again. Further, when the support leg 5 returns to its original position, the piston 34 of the cylinder A24 and the conical convex body A22 are moved by the coil spring 3.
5 to the original position, and at the same time, hydraulic oil flows into the cylinder A24 through the check valve A30 of the pipe 31. On the other hand, when the floating body 3 returns to its original position, the cylinder B2
The piston 40 of No. 5 and the conical concave disk B23 are pushed up to the original position by the coil spring 41, and at the same time, the hydraulic oil flows into the cylinder B25 through the check valve B55 of the pipe 56. When an opposite horizontal shear force is applied to the seismic isolation device, the stacked body 46 undergoes buckling deformation again, the outlet 48 of the valve cylinder A29 and the outlet 52 of the valve cylinder B38 are opened, and the support leg 5 and the floating Body 3 is
A relative horizontal displacement is caused to the support base 1 in the opposite direction to that described above. In this way, in the case of an earthquake in which the horizontal shear force acting on the base isolation device reaches the operating shear force, the support leg 5 and the floating body 3 are separated from the horizontal vibration of the ground and vibrate for a long period with their own natural period. . Therefore, no matter how intense the ground vibrations are, no horizontal seismic force greater than the horizontal seismic force generated by the long-period vibrations will act on the superstructure.

(3) Short-period seismic isolation operation and avoidance of resonance Figure 7 is a longitudinal sectional view showing the short-period seismic isolation operation of the seismic isolation device. In the case of an earthquake where the horizontal shear force acting on the seismic isolation device reaches the operating shear force as shown by the arrow, the seismic isolation device first enters long-period seismic isolation operation as described in (2). The computer control unit starts monitoring the deformation of the seismic isolation device using displacement detectors at the same time as the seismic isolation device operates, and when the deformation of the seismic isolation device gradually increases and signs of resonance appear, the following resonance is detected. Run the program to avoid. Open the electromagnetic switching valve A32 and the electromagnetic switching valve B57 to open the cylinder A24 and cylinder B25.
The hydraulic pressure is lowered to encourage the stacked body 46 to return to its original shape. When the laminated body 46 returns to its original shape, the solenoid 66 of the buckling restraint device 47 is energized, and the extensible support bodies 65 are brought into close contact with both surfaces of the laminated body 46. At the same time, the electromagnetic switching valve A32 and the electromagnetic switching valve B57 are closed. When the laminated body 46 is restrained by the buckling restraint device 47, the buckling load of the laminated body 46 becomes larger than the buckling load of the laminated body 45, so a horizontal shear force acts on the seismic isolation device and the laminated body 4
5 and the laminate 46, the laminate 46 does not undergo buckling deformation and the laminate 4
5 undergoes buckling deformation. With this, the upper pressure plate 4
2 and the valve piston 51 of the valve cylinder A29 are lowered, and the outlet 48 of the valve cylinder A29 is opened. On the other hand, the middle pressure plate 43 and the valve cylinder B3
Since the valve piston 59 of No. 8 cannot be lowered, the outlet 52 of the valve cylinder B38 remains closed. Therefore, the support leg 5 is a conical convex body A22.
is pressed down to vibrate, and the floating body 3 becomes a conical concave disk B.
23 restrains the vibration. in this way,
The seismic isolation device starts short-period vibrations in which the support legs 5 are horizontally displaced relative to the support base 1 and the movable body 3, and resonance induced by long-period vibrations is avoided. Furthermore, if signs of resonance appear in the seismic isolation device during this short-period seismic isolation operation, the computer control section de-energizes the solenoid 66, pulls the telescopic support body 65 away from the laminated body 46, and releases the restraint of the laminated body 46. unlock. As a result, the seismic isolation device returns to the long-period seismic isolation operation described in (2).
Resonances induced by short period vibrations are avoided. In this way, the natural period of the seismic isolation device is converted from a long period to a short period, or from a short period to a long period, thereby performing a seismic isolation operation while avoiding resonance.

(4) Other effects When a short-period, large-amplitude earthquake occurs and the seismic isolation device is activated, the conical convex body A22 suddenly descends a considerable distance. Along with this, the laminate 4
6 undergoes buckling deformation and the valve piston 51 of the valve cylinder A29 descends.
1 stops after descending a certain distance. For this reason,
If the conical convex body A22 suddenly descends, a situation occurs in which the hydraulic oil cannot completely flow out from the outlet 48 of the valve cylinder A29. At this time, the laminated body 45 is buckled and deformed following the laminated body 46, and the upper pressure plate 42 and the valve piston 51 are lowered to the limit of the deformation control device 62, and the outflow port 48 is enlarged to allow the hydraulic oil to flow out. promote.

When the earthquake subsides, the supporting leg 5 and the floating body 3 return to their original positions, and accordingly, the conical convex body A
22. The conical concave disc B23 also returns to its original position.
When a situation occurs in which the stacked body 46 or the stacked body 45 cannot return to its original shape due to the hydraulic pressure of the cylinder A24 or cylinder B25, the computer control section opens the electromagnetic switching valve A32 or the electromagnetic switching valve B57, and the cylinder A24 or The oil pressure of cylinder B25 is lowered to restore the laminated body. When the seismic isolation device completely returns to its original shape, the computer control section stops its function.

The seismic isolation device of the present invention, like the seismic isolation device of the original invention, is intended to reduce horizontal seismic force, and therefore cannot be expected to have a seismic isolation effect against vertical seismic force. However, the vertical component of seismic force is generally much smaller than the horizontal component;
Furthermore, since the superstructure has a relatively stable structure against vertical loads including vertical seismic forces, it is possible to sufficiently increase the seismic isolation effect simply by reducing horizontal seismic forces.

In the case of the original invention, the installation of the seismic isolation device creates a space between the foundation and the floor plate of the superstructure that is of no use value. In the original invention, in order to reduce this wasted space, the height of the support device was made as low as possible, and a portion of the control device was provided within a column of the superstructure. In the case of the original invention, maintenance and inspection of the control device or support device would be carried out by providing inspection ports in the pillars and support bases, but both the pillars and support bases are important structures that support huge vertical loads, so inspections are not possible. Since the position and size of the opening are restricted, maintenance and inspection of the seismic isolation device may be hindered. A superstructure with a seismic isolation structure is designed on the assumption that the seismic isolation device will fully demonstrate its performance, so if the seismic isolation device does not function properly, it will suffer major and fatal damage. Maintenance and inspection are important issues for seismic isolation devices.

In view of the above, the seismic isolation device of the present invention is manufactured with the first condition being that it can be completely maintained and inspected. In the present invention, in order to provide an inspection work space 67 inside the seismic isolation device, the height of the support platform 1 is made as high as that of a column, and along with this, the space between the foundation 6 and the floor plate portion 18 of the superstructure is increased. We decided to use the available space as a machine room or parking space. A passage 68 leading to the inspection work space 67 is provided on the side of the foundation beam. The foundation beam can be reinforced as desired by increasing the width of the beam, so there are no structural problems even if openings are provided on the sides. In the case of the seismic isolation device of the present invention, there remain some difficulties in maintenance and inspection of the support device, but if rust prevention is completed, there will be no fatal failure of the support device, so this is sufficient for practical purposes. It appears to be. As for the control device, if the sizes of the components are determined on the assumption that the components will be replaced within the device, the drawbacks of the original invention can be completely eliminated because disassembly, assembly, and component replacement can be done freely.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing a base isolation device according to the present invention, and a part of the foundation and superstructure. FIG. 2 is a cross-sectional view taken along line A-A showing the support device and shear force conversion device of the seismic isolation device of the present invention, and FIG. 3 is a cross-sectional view taken along line B-B showing the hydraulic cylinder device and foundation beam of the seismic isolation device of the present invention. , CC cross-sectional view. FIG. 4 is a vertical sectional view taken along line DD of the hydraulic cylinder device and foundation of the seismic isolation device of the present invention, and FIG. 5 is a vertical sectional view showing an enlarged view of the hydraulic valve device of the seismic isolation device of the present invention. . FIG. 6 is a longitudinal sectional view showing the long-period seismic isolation operation of the seismic isolation device of the present invention, and FIG. 7 is a longitudinal sectional view showing the short-period seismic isolation operation of the seismic isolation device of the invention. DESCRIPTION OF SYMBOLS 1...Support stand, 2...First hanging member, 3...Floating body, 4...Second hanging member, 5...Support leg, 6...Foundation, 10...Conical convex body B, 15... Concave concave disk A, 22...Conical convex body A, 23...Concave concave disk B, 24...Cylinder A, 25...Cylinder B,
27...Oil tank, 29...Valve cylinder A, 38
... Valve cylinder B, 45 ... Laminate, 46 ...
Laminated body, 47... Buckling restraint device, 67... Inspection work space.

Claims (1)

[Scope of Claims] 1 A columnar hollow body formed by a lower structure provided on the ground and a cylindrical support base includes a cylindrical floating body and a columnar structure having an upper structure support portion at the top. The support legs are housed in a nested manner at intervals from each other, and a plurality of hanging members are used to attach the floating body to the support base and the support legs to the floating body to form a support device. A guide in which an inspection work space is provided inside the hollow body, and one of a pair of concave and convex bodies that touch uneven surfaces is fixed to the bottom of the floating body and the support leg, and the other is installed in the columnar hollow body. A liquid cylinder device is installed at the bottom of the columnar hollow body to form a shear force converting device, and is equipped with a plurality of cylinders and a cylinder control section, and the above cylinder is installed at the top of the cylinder of the liquid cylinder device to form a shear force converting device. A pillar-type building seismic isolation device having an inspection work space characterized by connecting concave or convex bodies attached to guides. 2. The seismic isolation device for a column-type building having an inspection work space as set forth in claim 1, wherein the lower structure provided on the ground is a foundation structure having a foundation plate and a foundation burr. 3 The hanging material consists of one or more elongated annular bodies and 2
A pillar-type building seismic isolation device having an inspection work space as set forth in claim 1 or 2, which comprises U-bolts. 4 A plurality of first hanging members, each having an upper end connected to the upper part of the support base and a lower end connected to the lower part of the floating body; A pillar-type building seismic isolation device having an inspection work space as set forth in claim 1, 2, or 3, which is made of a plurality of second hanging members. 5 The shear force conversion device includes a plurality of convex bodies fixed to the bottom of the floating body with the convex part facing downward, a plurality of concave bodies attached to the guide opposite thereto, and a support leg bottom with the concave part facing downward. The inspection work according to claim 1 or 2, or 3, or 4, which has a concave body fixed to the part and a convex body mounted on the guide opposite thereto. Seismic isolation device for pillar-type buildings with space. 6. The pillar-type building seismic isolation device having an inspection work space according to claim 5, wherein the concave body is a concave concave disk having a concave concave surface, and the convex body is a convex convex body having a convex conical surface. 7. Claims 1 or 2, in which the inspection work space is a space large enough for a worker to enter therein and perform inspection or maintenance work;
Or a pillar-type building seismic isolation device having an inspection work space as described in paragraph 3, paragraph 4, paragraph 5, or paragraph 6. 8. Claims 1 or 2, or 3, wherein the cylinder control section has a valve device equipped with an elastic thin plate laminate and a buckling restraint device,
Or a pillar-type building seismic isolation device having an inspection work space as described in paragraph 4, paragraph 5, paragraph 6, or paragraph 7. 9. Inspection work according to claim 8, wherein the elastic thin plate laminate is formed by stacking a large number of cylindrical shell-shaped thin metal plates and applying pressure from a cylinder in the axial direction of the thin metal plates. Seismic isolation device for pillar-type buildings with space. 10 The buckling restraint device has a pressurizing device capable of pressurizing at least the plate surface of the elastic thin plate laminate, and has a mechanism that operates this pressurizing device in response to a command from a computer control unit. A pillar-type building seismic isolation device having an inspection work space according to claim 8 or 9. 11. Claim 1 or 2, or 3, wherein the liquid cylinder device is equipped with a valve operated by a command from a computer control section.
Section, or Section 4, or Section 5, or Section 6
or Section 7, or Section 8, or Section 9.
A pillar-type building seismic isolation device having an inspection work space as described in paragraph 1 or paragraph 10. 12 Claim 1 in which the valve is a solenoid switching valve
A pillar-type building seismic isolation device with an inspection work space as described in paragraph 1. 13. A pillar-type building isolation system having an inspection work space as set forth in claim 10 or 11 or 12, wherein the computer control unit has a displacement detector for detecting deformation of the seismic isolation device. Seismic device. 14. Claim 1 or 2, or 3, or 4, or 5, or 6, or 7, or 14, wherein the liquid cylinder device is a hydraulic cylinder device. Section 8 or Section 9
A pillar-type building seismic isolation device having an inspection work space according to item 1, or 10, or 11, or 12, or 13.