JPH11141186A - Lock mechanism for base isolation support and base isolation support device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate base isolation for the vibration of a constant value or more such as earthquake by providing a cylinder, a piston, a piston rod, an orifice passage, fluid, an energizing means for energizing the piston and an abutment means for abutting any one of the piston rod and the cylinder on the recess part of any one of a structure and foundation. SOLUTION: A lock mechanism 1 is disposed between a structure 13 and foundation 14 to support the structure 13, and used together with base isolation bearing base-isolating the structure by the shearing deformation of a horizontal direction 51. When the force of the horizontal direction 51 exceeds a constant value, force against a coil spring 35 is applied to a piston rod 6 through the roller 43 of a recess part 15, a piston 4 starts lowering, the roller 43 rolls out of the recess part 15 to release locking, base isolation bearing is shear-deformed in the horizontal direction 51. Transmission of vibration such as earthquake of the structure 13 is reduced by the shearing deformation and vibration energy is attenuated. Thus, the base isolation can be operated for the vibration such as the earthquake.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation bearing for supporting a structure such as a building, an apartment (a multi-family house) or a detached house by applying a relative horizontal force applied to the structure with respect to a foundation. The present invention relates to a lock mechanism for a seismic isolation bearing that is not actuated when wind is caused by wind or the like and a predetermined value or less, and a seismic isolation support device using the lock mechanism for the seismic isolation support.

[0002]

A seismic isolation bearing is arranged between a structure and a foundation to attenuate and transmit the vibration of the foundation due to an earthquake or the like to the structure so that the structure is not excessively vibrated. Thus, the destruction and collapse of the structure due to an earthquake or the like are prevented.

As a seismic isolation bearing, one using rolling or slipping or one using so-called shear deformation of laminated rubber has been proposed. However, in order to prevent vibration of the foundation due to an earthquake or the like from being transmitted to a structure. In general, a design using rolling or sliding is designed to be easily rolled or slipped, and a design using shear deformation of the laminated rubber is designed to be easily sheared.

[0004] By the way, rolling or slipping or shearing is easy because the structure is easily vibrated by a slight horizontal force applied to the structure itself such as wind other than the vibration caused by the original earthquake. If the structure is a building, a condominium, a single-family house, or the like as described above, the livability deteriorates.

It is necessary for seismic isolation bearings to satisfy such a trade-off characteristic, but there is no proposal that satisfies this requirement.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to make a seismic isolation bearing operable with respect to vibration of a certain value or more due to crustal deformation such as an earthquake. Provided is a lock mechanism for a seismic isolation support that can prevent the seismic isolation bearing from being actuated by a slight horizontal force applied to the structure itself such as wind, and a seismic isolation support device using the lock mechanism for the seismic isolation support. Is to do.

[0007]

According to the present invention, there is provided a locking mechanism for a seismic isolation bearing, comprising: a cylinder; a piston slidably disposed with respect to the cylinder; and a piston rod having one end connected to the piston. An orifice passage communicating the chamber on one end side of the piston defined by the piston and the chamber on the other end side of the piston, the fluid disposed in both chambers, and moving the piston toward the other end of the piston rod. One of the piston rod and the cylinder is provided with an abutting means for abutting against a recess formed in one of the structure and the foundation. doing.

The lock mechanism of the present invention can release the lock only by the orifice passage. However, in order to quickly release the lock, the lock mechanism between the chamber on one end side of the piston and the chamber on the other end side of the piston is used. It may further comprise a one-way valved passage that allows movement of the fluid in one direction,
The one-way valved passage is formed such that its passage diameter is substantially sufficiently larger than the passage diameter of the orifice passage. Here, the passage with the one-way valve may be provided in a cylinder or the like, but is preferably provided in a piston in a preferred example.

In the present invention, the piston rod slides on the inner peripheral surface of a cylinder or cylinder extending through one of the chamber on one end side of the piston and the chamber on the other end side of the piston. When the piston rod is a cylindrical body with a bottom fitted freely and the piston rod is a cylindrical body, one chamber and the other chamber are surrounded by a cylinder and the piston rod is a cylindrical body. One of the chamber on the one end side of the piston and the chamber on the other end side of the piston is surrounded by a cylinder, and the other chamber is surrounded by a piston rod.

In the present invention, the fluid disposed in both chambers may be a gas or a liquid, but is preferably a liquid such as silicone oil which can be expected to have a desired flow resistance.

In the present invention, the orifice passage through which the fluid disposed in both chambers passes is preferably provided in the piston, but may be provided in the cylinder instead.

The urging means of the present invention is preferably preferably constituted by an elastic means such as a coil spring. When constituted by a coil spring, one end thereof is brought into contact with the piston and the other end is brought into contact with the cylinder. It is good to contact and arrange in the cylinder concerned.

[0013] The contact means is usually provided on one of the piston rod and the cylinder so as to contact a recess formed on the lower surface of the structure. It may be embodied by a hemispherical or semi-cylindrical surface formed on the piston rod or cylinder so as to make sliding contact with the place, but instead, preferably at the other end of the piston rod or the end of the cylinder, It is embodied by a sphere or a roller mounted rotatably. The recess may be wedge-shaped or V-shaped, or may be hemispherical, conical, or frusto-conical, but preferably, the recess is hemispherical, conical. It is formed in a planar shape. By forming the abutting means from a hemispherical surface or a sphere and forming the concave portion from a hemispherical surface, a conical surface or a truncated conical surface, the seismic isolation of the present invention can be applied to any horizontal force. This is preferable because the locking mechanism for the bearing can be operated.

The lock mechanism for seismic isolation bearings of the present invention is applicable to structures such as buildings, condominiums and single-family homes, but is particularly suitable for use in single-family homes having a relatively small weight.

The seismic isolation support device of the present invention is provided between the above-described locking mechanism for seismic isolation support and the structure and the foundation to support the structure, and also includes the shear deformation and the rolling and sliding displacement. A seismic isolation bearing for seismically isolating the structure by at least one of the elements, wherein the locking mechanism for the seismic isolation bearing has, at one end, one of the lower surface of the structure and the upper surface of the foundation via a contact means. It is in contact with the recess formed on one side,
At the other end, it is fixed to one of the lower surface of the structure and the upper surface of the foundation.

The seismic isolation support device of the present invention is not limited to one having only one lock mechanism for seismic isolation bearings. For example, a plurality of locks for seismic isolation bearings symmetrically arranged around the seismic isolation bearings It may have a mechanism.

The seismic isolation bearing of the seismic isolation support device of the present invention may be a roller using the rolling of the roller, a sliding plate using the sliding against the sliding plate, or a reinforcing layer made of a steel plate or the like. A laminated rubber in which rubber layers made of rubber or the like are alternately laminated, and lead struts are arranged inside as necessary, may be one that uses shear deformation of the rubber layer.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in more detail with reference to the preferred embodiments shown in the drawings. The present invention is not limited to these embodiments.

[0019]

1, a locking mechanism 1 for a seismic isolation bearing according to the present invention comprises a cylinder 2, a piston 4 slidably disposed in the axial direction (vertical direction) 3 with respect to the cylinder 2, and a piston 4. A piston rod 6 having one end 5 connected to the piston 4, an orifice passage 9 communicating a chamber 7 defined by the piston 4 on one end side of the piston 4 and a chamber 8 on the other end side of the piston 4, and both chambers. 7 and 8, a liquid fluid 10 such as silicon oil, a biasing means 12 for biasing the piston 4 toward the other end 11 of the piston rod 6, and a piston rod 4 and a cylinder 2. Either one is provided at the other end 11 of the piston rod 4 in this example,
And in this example, the structure 1
The movement of the fluid 10 in one direction between the contact means 16 contacting the recess 15 formed in the piston 3 and the chamber 7 on one end side of the piston 4 and the chamber 8 on the other end side of the piston 4, this example And a passage 17 with a one-way valve which allows the movement of the fluid 10 from the chamber 7 to the chamber 8.

The cylinder 2 includes a cylindrical body 21 and a cylindrical body 21.
A lower plate-shaped lid 22 fixed to one end of the cylindrical body 21 and an upper cap-shaped lid 23 fixed to the other end of the cylindrical body 21
Inside the cylindrical body 21, the chamber 7 is formed between the piston 4 and the lid 22, and the piston 4 and the lid 23
The chambers 8 are respectively formed between them.

Orifice passage 9 and passage 1 with one-way valve
Each of 7 is provided on the piston 4. The one-way valved passage 17 is formed such that its passage diameter is substantially sufficiently larger than the passage diameter of the orifice passage 9.

The piston rod 6 of the present embodiment is formed of a columnar body extending outside through the chamber 8 and the lid 23, and the chamber 7 and the chamber 8 of the present embodiment are surrounded by the cylinder 2.

The biasing means 12 includes a piston 31 at one end 31.
And a coil spring 35 disposed in the chamber 7 in the cylinder 2 at the other end 33 against the upper surface 34 of the lid 22 of the cylinder 2.

The contact means 16 includes a roller support member 41 fixed to the other end 11 of the piston rod 4 and a roller 43 rotatably mounted on the roller support member 41 via a shaft 42. , The roller 43 comes into contact with the recess 15.

The chamber 8 is not filled with the fluid 10 but is filled with a compressive fluid, for example, a gas 45 such as air.
Is arranged. Therefore, the chamber 8 does not need to be sealed to the outside. For example, a through hole may be formed in the lid 23, and the chamber 8 may communicate with the outside via the through hole.

As shown in FIG. 2, the lock mechanism 1 is disposed between the structure 13 and the foundation 14 so that the structure 13
, And is used together with a seismic isolation bearing 52 that seismically isolates the structure 13 by shear deformation in the horizontal direction 51, for example, a seismic isolation bearing 52 made of laminated rubber. Here, the lock mechanism 1
At one end, the roller 43 of the contact means 16 is
At the other end, the lid 22 of the cylinder 2 is fixed to the upper surface 54 of the foundation 14 and is disposed between the structure 13 and the foundation 14. Since the seismic isolation bearing 52 itself is well known, description thereof will be omitted.

The base 14 is attached to the structure 13 by an earthquake or the like.
When the base vibrates in the horizontal direction 51, the seismic isolation bearing 52 tends to be sheared in the horizontal direction 51. However, when the horizontal force 51 of the foundation 14 with respect to the structure 13 is equal to or less than a predetermined value, the locking is performed. The displacement of the structure 13 in the horizontal direction 51 with respect to the foundation 14 is prevented by the mechanism 1, and the seismic isolation bearing 52 is not sheared in the horizontal direction 51, and the structure 13 and the foundation 14 similarly vibrate in the horizontal direction 51. I do.

The horizontal direction 5 of the foundation 14 with respect to the structure 13
When the force exceeds the predetermined value, a force opposing the elastic force of the coil spring 35 is applied to the piston rod 6 via the roller 43 abutting against the recess 15, whereby the piston rod 6 and the piston 4 descend. At the same time, the roller 43 rolls out of the recess 15 and abuts against the lower surface 53 of the structure 13 outside the recess 15 to roll, and the lock by the lock mechanism 1 is released. The seismic bearing 52
It will be sheared in the horizontal direction 51. During vibration of the foundation 14 in the horizontal direction 51 due to an earthquake or the like, the seismic isolation bearing 52
Shearing is alternately performed in the horizontal direction 51, and the transmission of vibration due to an earthquake or the like to the structure 13 is reduced by the shearing, and the vibration energy is attenuated.

By the lowering of the piston 4, the fluid 10 contained in the chamber 7 flows into the chamber 8 mainly through the one-way valve passage 17 with almost no flow resistance. After this flow,
During the vibration of the foundation 14 in the horizontal direction 51 due to an earthquake or the like, every time the roller 43 is positioned in the recess 15, the elastic force of the spring 35 tries to raise the piston 4. Fluid 1 from chamber 8 to chamber 7
Although it is necessary to perform the flow of 0 at the same time,
The flow of the fluid 10 to the base 14 is carried out slowly only through the orifice passage 9 having a large flow resistance instead of the passage 17 with the one-way valve. However, while the roller 43 is passing through the recess 15, the piston 4 is not raised to such an extent that the roller 43 fits into the recess 15 before vibration occurs. Therefore, once the lock mechanism 1 is unlocked, the lock operation is not performed again until the vibration such as an earthquake stops to some extent. During the vibration due to the earthquake or the like, the seismic isolation bearing 52 is locked. Shearing is alternately performed in the horizontal direction 51 without being affected by the locking operation of the mechanism 1.

Normally, when targeting an earthquake in Japan,
The diameter of the orifice passage 9 and the type of the fluid 10 are selected so that the time required for the roller 43 to be fitted into the recess 15 before the occurrence of vibration takes about 30 seconds to 1 minute.

When the vibration such as an earthquake falls to some extent, the roller 43 is fitted into the recess 15 in a state before the occurrence of the vibration.
4 is prevented again in the horizontal direction 51.

Since the lock mechanism 1 operates as described above, even if the structure 13 is vibrated in the horizontal direction 51 with respect to the foundation 14 due to wind or the like, the structure is prevented by vibrating the structure 13.
(3) Vibration due to wind or the like can be prevented.

In the lock mechanism 1 described above, the piston rod 6 is formed of a cylindrical body, and the abutting means 16 is provided at the other end 11 of the piston rod 6. However, as shown in FIG. A cylindrical body with a bottom fitted slidably on the inner peripheral surface of the second cylindrical body 21, the chamber 7 on one end side of the piston 4 is surrounded by the cylinder 2, and the chamber 8 is surrounded by the piston rod 6. Alternatively, the abutting means 16 may be provided on the cap-shaped lid 22 of the cylinder 2 so that the abutting means 16 abuts on the recess 15 formed on the upper surface 54 of the base 14. In the example shown in FIG. 3, the piston 4 is fixed to one end 5 of the piston rod 6, and the other end 11 of the piston rod 6 is fixed to the lower surface 53 of the structure 13 via a plate-like mounting member 61. The contact means 16 includes a connecting rod 62 having one end fixed to the lid 22 and the other end to which the roller supporting member 41 is attached, in addition to the roller supporting member 41 and the roller 43. The other end 11 of the piston rod 6 is connected to the lower surface 5 of the structure 13 by omitting the attachment member 61 and the connecting rod 62.
Third, the roller support members 41 may be directly fixed to the lid 22 respectively. The lock mechanism 1 shown in FIG. 3 operates similarly to the lock mechanism 1 shown in FIG.

[0034]

According to the present invention, seismic isolation bearings can be activated against a certain level of vibration due to crustal deformation such as an earthquake, and a small amount of horizontal force applied to the structure itself such as wind. The seismic isolation bearing may not be activated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a preferred embodiment of a lock mechanism for a seismic isolation bearing of the present invention.

FIG. 2 is an explanatory view of a preferred embodiment of the seismic isolation support device of the present invention using the example shown in FIG.

FIG. 3 is a cross-sectional view of another preferred embodiment of the locking mechanism for the seismic isolation bearing of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking mechanism for seismic isolation bearing 2 Cylinder 4 Piston 6 Piston rod 7, 8 chamber 9 Orifice passage 10 Fluid 12 Urging means 13 Structure 14 Foundation 15 Recess 16 Contact means

Claims (9)

[Claims] 1. A cylinder, a piston slidably disposed with respect to the cylinder, a piston rod having one end connected to the piston, a chamber defined by the piston on one end face side of the piston, and a piston. An orifice passage communicating with the chamber on the other end side of the piston rod, a fluid disposed in both chambers, and biasing means for biasing the piston toward the other end side of the piston rod. And a lock mechanism for a seismic isolation bearing, wherein one of the cylinder and the cylinder includes a contact means for contacting a recess formed in one of the structure and the foundation. 2. A one-way valved passage further comprising a one-way valve-passage that allows fluid to move in one direction between a chamber on one end side of the piston and a chamber on the other end side of the piston. 2. The locking mechanism for a seismic isolation bearing according to claim 1, wherein the passage is formed so that its passage diameter is substantially sufficiently larger than the passage diameter of the orifice passage. 3. The locking mechanism according to claim 2, wherein the one-way valve passage is provided in the piston. 4. The piston rod comprises a cylindrical body extending through one of the chamber on one end side of the piston and the chamber on the other end side of the piston, and the one chamber and the other chamber are provided. The locking mechanism for seismic isolation bearing according to any one of claims 1 to 3, wherein the lock mechanism is surrounded by a cylinder. 5. The piston rod is formed of a bottomed cylindrical body slidably fitted on the inner peripheral surface of the cylinder, and has one of a chamber on one end side of the piston and a chamber on the other end side of the piston. 4. A method according to claim 1, wherein one of the chambers is surrounded by a cylinder and the other is surrounded by a piston rod.
The locking mechanism for a seismic isolation bearing according to any one of the above. 6. The locking mechanism for a seismic isolation bearing according to claim 1, wherein the fluid disposed in both chambers is a liquid. 7. The locking mechanism for a seismic isolation bearing according to claim 1, wherein the orifice passage is provided in the piston. 8. The biasing means includes a coil spring disposed at one end in contact with the piston and at the other end in contact with the cylinder and disposed in the cylinder. The locking mechanism for seismic isolation bearings described in. 9. A seismic isolation bearing arranged between a structure and a foundation to support the structure and seismically isolate the structure by at least one of shear deformation and rolling and sliding displacement. 7. The locking mechanism for a seismic isolation bearing according to any one of 7), wherein the locking mechanism for the seismic isolation bearing has, at one end, a lower surface of the structure and an upper surface of the foundation via a contact means. A seismic isolation support device that abuts a recess formed in any one of them, and is fixed at the other end to one of the lower surface of the structure and the upper surface of the foundation.