JP2002021924A - Base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base isolation device capable of effectively preventing rocking vibration while attaining a long period of a base isolation object by using air springs capable of minimizing the height. SOLUTION: The air springs 13 have an inside member 17 projected upward from a base board 17a, an outside member 18 for covering an upper end part of the inside member 17 at a proper interval and a rolling seal member 21 for sealing these inside member 17 and outside member 18 while allowing a relative movement of both. Triangular trusses 15 are arranged on respective side surfaces of a building 11, and a base 15a of the triangular trusses 15 is supported on an upper surface of a foundation 12 via a horizontal movement guide means 14. The side surfaces of the building 11 are supported on a right- angled side 15b of the triangular trusses 15 via a vertical movement guide means 16 and the horizontal movement guide means 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vibration isolator,
In particular, the present invention relates to an anti-vibration device that enables an effective long period of a structure using an air spring and prevents rocking vibration of an object to be isolated in that case.

[0002]

2. Description of the Related Art An anti-vibration device is a base to which vibrations of the ground and floor are input, and a vibration-damping object such as a building, precision equipment, other equipment or devices that dislike vibration, and articles installed on the base. A so-called period increasing means is provided between the base and the vibration-isolating target object. The vibration input to is reduced.

[0003] Various elastic bodies represented by laminated rubber, coil springs, air springs and the like are employed as the period increasing means. In particular, since the air spring is a spring that utilizes the compression elasticity of air, it is softer than other springs, and exhibits excellent characteristics in prolonging the period of the vibration-isolated object. For this reason, it is preferable to use an air spring as a vibration isolator, and an excellent vibration isolator can be provided by utilizing the vertical spring force and horizontal spring force (lateral rigidity) of the air spring.

A bellows type air spring is generally used as the air spring. A typical structure thereof is a bellows-shaped cylindrical rubber bellows having peaks and valleys formed in the circumferential direction. , And a metal face plate that covers the top and bottom,
An intermediate ring fitted to the valley portion of the rubber bellows. The vertical spring of the air spring is obtained by the elastic force when the air sealed in the rubber bellows is compressed with the expansion and contraction of the rubber bellows,
The horizontal spring is obtained by the restoring force generated depending on the enclosed air pressure and the rigid nature of the rubber bellows.

[0005] By the way, the bellows-type air spring, which has a reduced height of rubber bellows, that is, a number of bellows steps, is used in order to enhance the supportability of the vibration-isolated object with a large load.
Since the volume of the air chamber is small, the air pressure rises excessively with respect to the relative vertical amplitude between the base and the vibration-isolated object, and the rubber bellows expand beyond the allowable amount, resulting in durability. Problems arise. Therefore, in order to increase the volume of the air chamber in order to suppress an excessive rise in the air pressure, the number of rubber bellows is increased to increase the air spring. However, when the air spring is raised in this way, the rubber bellows easily buckles, and it becomes difficult to cope with a large load and a large amplitude intended for a large earthquake.

[0006]

Therefore, as a method for avoiding the buckling of the rubber bellows, the present inventor proposes to use a rolling seal type air spring instead of the bellows type air spring. The rolling seal type air spring is provided with a solid inner member and a hollow cylindrical outer member which are arranged concentrically at appropriate intervals, and a horizontal gap between the outer periphery of the inner member and the inner periphery of the outer member. And a flexible cylindrical rolling seal member that is folded back so as to hang down. The rolling seal member is folded back at its intermediate portion, its inner peripheral portion is fitted along the outer periphery of the inner member, and its end is hermetically attached to the upper end of the inner member, and its outer peripheral portion is placed along the inner periphery of the outer member. The end is hermetically attached to the upper end of the outer member to seal an air chamber formed between the inner and outer members.

When the inner member and the outer member are vertically displaced relative to each other due to vibration input, the folded portion of the rolling seal member is lifted up by a horizontal gap,
It can be brought down. At this time, the pressure acting on the air chamber acts on the rolling seal member, and the folded portion of the rolling seal member is a portion that closes a horizontal gap between the inner member and the outer member, and the folded portion is It will receive the pressure in the air chamber. Thereby, the volume change of the air chamber is allowed,
In the rolling seal type air spring, it is possible to achieve a longer cycle while keeping the overall height low.

On the other hand, when the air spring is used as described above,
Although such a soft spring works advantageously for increasing the period of the vibration-isolated object, there is a problem that rocking vibration is easily generated on the vibration-isolated object.

In view of the foregoing, the present invention has been made in view of the above-mentioned conventional problems, and achieves a longer period of the vibration-isolated object by using an air spring whose height can be suppressed to a low level, while locking the object. It is an object of the present invention to provide a vibration isolator capable of effectively preventing vibration.

[0010]

In order to achieve the above object, a vibration isolator according to the present invention is provided between a base to which vibration is input and an object to be isolated above the base. An inner member protruding from one side of the vibration target toward the other side, and an inner member protruding from the other side of the base or the vibration-isolation target toward the one side, and appropriately spaced apart in the vertical and horizontal directions. An outer member of a hollow cylindrical body surrounding the outer periphery of the member, and the outer member is folded back so as to hang down in a horizontal gap between the inner periphery of the outer member and the outer periphery of the inner member. The inner end of the base member is hermetically attached to the inner member, and the outer peripheral portion thereof is hermetically attached to the outer member along the inner periphery of the outer member. Vibration target Along with the vertical relative displacement of the inner member and the outer member with the vertical relative displacement of the inner member and the outer member, the inner member and the outer member are displaced up and down in the horizontal gap, and from the horizontal gap between the outer member and the inner member. A flexible cylindrical rolling seal member forming a gas-enclosed space, and between the base and the vibration-isolation object via horizontal movement guide means for guiding relative horizontal movement in front, rear, left and right. It is characterized in that the support member is erected up and down, and vertical movement guide means for guiding relative vertical movement is interposed between the support member and the object to be isolated.

Thus, the vertical vibration and the horizontal vibration of the vibration-isolated object are allowed through the horizontal movement guiding means and the vertical movement guiding means, while the vertical movement guiding means between the support member and the vibration-isolated object is allowed to move. Rocking vibration of the vibration target can be prevented.

In this case, a joint member that allows horizontal rotation of the vibration-isolated object is interposed between the vertical movement guide means and the support member or the vibration-isolated object. It is preferable to release the moment due to the torsional rotation component acting on the motor.

[0013]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show an embodiment of a vibration isolator according to the present invention. FIG. 1 is a front view showing the entire structure of the vibration isolator, FIG. 2 is an enlarged sectional view of an air spring, and FIG. FIG. 3 is a sectional view taken along line AA.

The vibration isolator 10 of this embodiment shows a case where a building 11 is used as a vibration isolating object. As shown in FIG. 1, gas is sealed between the building 11 and a base 12 as a base. Movement guide means 1 for arranging an air spring 13 to extend the period of the building 11 and guiding relative horizontal movement in the front, rear, left and right between the foundation 12 and the building 11.
A triangular truss 15 as a support member is vertically erected through the truss 4 and 14a.
Vertical movement guide means 1 for guiding relative vertical movement between
By interposing 6, the rocking vibration of the building 11 is prevented.

The air spring 13 is formed as a rolling seal type air spring (hereinafter, simply referred to as an air spring). As shown in FIG. 2, the air spring 13 is an inner member 17 projecting upward from the base 12 side. And an outer member 18 of a hollow cylindrical body projecting downward from the building 11 side and surrounding the outer periphery of the inner member 17 at appropriate intervals in the vertical and horizontal directions, and the inner member 17 and the outer member 18. And a rolling seal member 19 that seals the space between the two while permitting relative movement between the two.

The inner member 17 projects from a substrate 17a fixed to the base 12, and an upper end facing the outer member 18 is opened with an opening 17b.
A hollow chamber 17c communicating with the opening 17b is formed to have a hollow cylindrical shape, and the lower end of the inner member 17 is integrally fixed to the substrate 17a and closed.

On the other hand, the outer member 18 has an inverted U-shaped cross section by an end plate 18a opposed to the upper end of the inner member 17 at an appropriate distance and a peripheral wall 18b suspended annularly from the outer periphery of the end plate 18a. As shown in FIG. 3, the peripheral wall 18b concentrically surrounds the outer periphery of the upper end portion of the inner member 17 at appropriate intervals, and the end plate 18a is provided on the lower surface of the building 11. Fixed. A space closed by the end plate 18a of the outer member 18 and the rolling seal member 19 from the hollow chamber 17c of the inner member 17 via the opening 17b is formed as a main gas filled space 20.

The rolling seal member 19 is disposed in a horizontal gap between the outer periphery of the inner member 17 and the inner periphery of the peripheral wall 18b of the outer member 18. Seal member 21 and second seal member 22 arranged in parallel toward
It is constituted by and. These first and second seal members 2
Reference numerals 1 and 22 are each formed into a cylindrical shape in a natural state using fiber reinforced rubber as a raw material, and the intermediate portion is folded back so that one side is turned over. It is attached across the member 18.

That is, the first and second seal members 21 and
2 is folded back at the intermediate portion, so that one end on the side turned over becomes the outer peripheral portions 21a and 22a, and the other end on the opposite side becomes the inner peripheral portions 21b and 22b. The inner peripheral portions 21b and 22b are made to extend along the outer periphery of the upper end portion of the inner member 17, and the outer peripheral portions 21a and 22a are made to extend along the inner periphery of the peripheral wall 18b of the outer member 18. At this time, the inner peripheral portions 21b, 22b and the outer peripheral portions 21a, 22
Each end of a is air-tightly fixed to the inner member 17 and the outer member 18 along which each end is located. In this state, the first and second seal members 21 and 22 are folded back.
A seal 22c is provided between the outer periphery of the inner member 17 and the inner periphery of the outer member 18 to seal the inner member 17, the outer member 18 and the first seal member 21.
Are formed as the main gas-filled space 20, and a space surrounded by the first seal member 21 and the second seal member 22 is formed as a sub-gas-filled space 23.

Therefore, the air spring 1 constructed as described above is used.
3 is the basics 1 when vibrations such as earthquakes are input.
When the building 2 and the building 11 are vertically displaced relative to each other, the inner member 17 and the outer member 18 are relatively displaced in the up and down direction, and the volume change in the main gas-filled space 20 formed between the two. The air pressure is changed accordingly. When the volume of the main gas filled space 20 is changed in this manner, the first and second seal members 21 and 22 are formed such that the inner peripheral portions 21b and 22b and the outer peripheral portions 21a and 22a are formed on the outer periphery of the inner member 17 and the inner periphery of the outer member 18. They will be moved up and down alternately.

The first and second seal members 21 and
An air pressure P2 lower than the air pressure P1 of the main gas sealing space 20 is sealed in the sub-gas sealing space 23 formed between the two, and the differential pressure (P1-P2) is applied to the folded portion 21c of the first seal member 21. ) And a low air pressure P2 is applied to the folded portion 22c of the second seal member 22 so that these folded portions 21c, 22c
To reduce the substantial pressure borne by.
As a result, the durability of the rolling seal member 21 can be improved, and the supporting load of the air spring 13 can be increased.

In this embodiment, the triangular truss 1 is used.
Two units 5 are arranged on each side surface of the building 11 at appropriate intervals L1 so as to be substantially symmetric from the center of each surface, and a total of eight units are installed on four surrounding surfaces. The triangular truss 15 has a base 15
a is horizontal and the right-angled side 15b is up and down in a triangular shape, and the bottom side 15a is supported on the upper surface of the foundation 12 via the horizontal movement guide means 14. This horizontal movement guide means 1
Reference numeral 4 denotes a linear bearing rail which can move horizontally in the horizontal direction in the figure, and the triangular truss 15 can move smoothly in the horizontal direction along the horizontal plane.

The right-angled side 15b supports the side surface of the building 11 via vertical movement guide means 16. The vertical movement guide means 16 is provided with an appropriate interval L2 in the vertical direction to each of the triangular trusses 15. Two units are provided for each. The vertical movement guide means 16 is constituted by a linear bearing rail which can move up and down in one direction, and the building 11 can move smoothly in the up and down direction.

Further, between the vertical movement guide means and the side of the building, there is provided a horizontal movement guide means 14a which allows horizontal movement in another direction, and the horizontal movement guide means 14a is shown in FIG. The building 11 is configured by a linear bearing rail that can move horizontally in the front-rear direction (perpendicular to the plane), and the building 11 can move smoothly in the front-rear direction along the horizontal plane. At this time, the horizontal movement guide means 14 prevents rattling in the rising direction between the triangular truss 15 and the foundation 12, and maintains the verticality of the triangular truss 15 with high accuracy to reduce the inclination. Is to be prevented. Further, the vertical movement guide means 16
In this case, rattling in the separation direction between the triangular truss 15 and the building 11 is prevented, and the distance between the triangular truss 15 and the building 11 can be maintained with high accuracy.

Further, a joint member 30 is provided between the vertical movement guide means 16 and the right-angled side 15b of the triangular truss 15 to allow horizontal rotation while preventing vertical inclination. As a result, a moment due to the twist rotation component acting on the building 11 is released. The joint members 30 are respectively arranged at two upper and lower positions with respect to each vertical movement guide means 16.

With the above configuration, the vibration isolator 1 of the present embodiment is
0, when the inner member 17 and the outer member 18 are vertically displaced relative to each other by the vertical vibration component of the input vibration, the pressure in the main gas filled space 20 is changed accordingly, At this time, a soft vertical spring is obtained due to the compression elasticity of the sealed gas, whereby the natural period in the vertical direction of the building 11 can be lengthened and the vertical vibration can be effectively isolated.

In this case, since the air spring 13 is formed as a rolling seal type, when the inner member 17 and the outer member 18 are relatively displaced in the vertical direction, the first and second seal members along the outer periphery of the inner member 17 are provided. 21 and 22 and the first and second portions along the inner circumference of the outer member 18.
The outer peripheral portions 21a and 22a of the second seal members 21 and 22 are alternately moved up and down to form the main gas filled space 2
Since a volume change of 0 is allowed, the above-described long period can be achieved while suppressing the height of the air spring 13 to be low.

When the inner member 17 and the outer member 18 are relatively displaced in the horizontal direction by the horizontal vibration component of the input vibration, the restoring force generated depending on the sealed gas pressure in the main gas sealed space 20 and the first force are reduced. , A soft horizontal spring is obtained by the rigid properties of the second seal members 21 and 22, whereby the natural period of the building 11 in the horizontal direction can be lengthened and horizontal vibration isolation can be achieved. Therefore, the vibration isolator 10 of the present embodiment is used.
The three-dimensional vibration isolation can be achieved by effectively utilizing the vertical vibration isolation function and the horizontal vibration isolation function of the air spring 13.

By the way, when the building 11 is three-dimensionally isolated by the soft vertical spring force and the horizontal spring force of the air spring 13, the building 1 is softened because of the softness of the air spring 13.
In this embodiment, a triangular truss 15 provided with horizontal movement guide means 14 and 14a and vertical movement guide means 16 is provided between the four surroundings of the building 11 and the foundation 12, although rocking vibration is likely to occur in the structure 1. As a result, building 11
Rocking vibration can be prevented while permitting vertical movement and horizontal movement of the motor. That is, the horizontal movement guide means 14 and 14a allow only the horizontal movement of the triangular truss 15 with respect to the foundation 12, and the verticality of the triangular truss 15 is maintained with high accuracy. Only the vertical movement of the building 11 with respect to the triangular truss 15 is allowed.
The spacing between 1 and the triangular truss 15 is kept constant with high accuracy. Therefore, the building 11 is prevented from moving other than its horizontal movement and vertical movement.

Therefore, the rocking vibration in which both ends of the building 11 swing up and down in opposite phases causes the ends of the building 11 to be vertically displaced along an arc-shaped trajectory. Since the regulation can be performed by the vertical holding of the triangular truss 15, the rocking vibration of the building 11 can be prevented as a result. In particular, in the present embodiment, since the two vertical movement guide means 16 are arranged at an interval L2 in the vertical direction with respect to each triangular truss 15, the vertical holding property of the building 11 is improved by the two vertical movement guide means 16. It is possible to increase the restraint of the building 11 against the rocking vibration. The triangular truss 15 is used for building 1
Since the two units 1 are arranged with an interval L1 on each side surface, the restraining force of the building 11 borne by each triangular truss 15 can be reduced, so that the rocking vibration can be stably prevented.

Even when the triangular truss 15 is provided in this manner, horizontal movement in all directions is allowed through the horizontal movement guide means 14 and 14a, thereby guaranteeing the horizontal vibration isolation function. In addition, the vertical movement of the building 11 with respect to the triangular truss 15 via the vertical movement guide means 16 allows the vertical vibration isolation function to be ensured. By providing the triangular truss 15 in this manner, rocking vibration can be effectively prevented without hindering the three-dimensional vibration isolation of the building 11.

In the present embodiment, if there is a torsional rotation vibration component in the vibration input from the foundation 12 to the building 11 via the air spring 13, the torsion rotation component causes the building 11 to rotate in the rotational direction about the vertical axis. The vertical movement guide means 16 may be rocked due to the swing. At this time, in this embodiment, since the vertical movement guide means 16 is provided with the joint member 30 that allows horizontal rotation while preventing vertical inclination, the moment due to the torsional rotation is released by the horizontal rotation of the joint member 30. This can prevent the vertical movement guide means 16 from being damaged. Further, since the joint member 30 prevents the vertical inclination, the function of preventing the original rocking vibration is ensured. Further, in the present embodiment, the joint member 30 is disposed at two positions above and below the vertical movement guide means 16, so that the supportability between the vertical movement guide means 16 and the triangular truss 15 is increased, and the rocking vibration is reduced. The prevention effect can be enhanced.

The joint member 30 is interposed between the vertical movement guide means 16 and the right side 15b of the triangular truss 15, but is not limited to this. It can also be done. In addition, the support member is constituted by the triangular truss 15, but is not limited thereto.

Further, the air spring 13 of the present embodiment is configured such that the rolling seal member 21 is connected to the two first and second seal members 2.
Although the configuration is made up of 1 and 22, it is needless to say that the configuration can be made up of one or three or more. Also, the inner member 17 is
Although the side member 18 and the outer member 18 are provided on the building 11 side, the same function can be obtained by disposing the inner member 17 and the outer member 18 in reverse. Further, in the above-described embodiment, the earthquake has been described as an example of the input vibration. However, it is needless to say that the vibration can be isolated while preventing the rocking vibration of the building 11 even if it is a traffic vibration or a daily vibration.

[0035]

As described above, the anti-vibration device of the present invention achieves a longer period of the vibration-isolated object by using a rolling seal type air spring. Between the vibration-isolation target object, the support members are erected up and down via horizontal movement guide means for guiding the front and rear relative horizontal movement, and between the support member and the vibration-isolation target,
Since the vertical movement guide means for guiding the relative vertical movement is provided, the pillar members can prevent movement other than horizontal movement and vertical movement of the vibration-isolated object, so that rocking vibration of the vibration-isolated object can be prevented. It can be effectively prevented.

Also, since a joint member that allows horizontal rotation of the vibration-isolated object is interposed between the vertical movement guide means and the support member or the vibration-isolated object, a torsional rotation component acting on the vibration-isolated object is provided. The vertical movement guide means can be prevented from being damaged by releasing the moment due to the above.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an entire configuration showing an embodiment of a vibration isolation device according to the present invention.

FIG. 2 is an enlarged sectional view of an air spring used in one embodiment of the vibration isolator according to the present invention.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2, showing one embodiment of the vibration isolator according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vibration isolation device 11 Building 12 Foundation 13 Rolling seal type air spring 14, 14a Horizontal moving guide means 15 Triangular truss 16 Vertical moving guide means 17 Inner member 18 Outer member 19 Rolling seal member 20 Gas filled space 21a, 22a Outer peripheral portion 21b, 22b Inner circumference part 21c, 22c Folded part 30 Joint member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) E04B 5/43 E04B 5/43 F E04H 9/02 331 E04H 9/02 331Z F16F 9/05 F16F 9/05

Claims (2)

[Claims] An inner member provided between a base to which vibration is input and a vibration-isolation target above the base, and protruding from one of the base or the vibration-isolation target toward the other side; An outer member of a hollow cylindrical body protruding from the other of the base or the vibration-isolation target object toward one side and surrounding the outer periphery of the inner member at appropriate intervals in the vertical and horizontal directions; Folded and arranged so as to hang down in a horizontal gap between the inner periphery and the outer periphery of the inner member, the inner peripheral portion of the inner member is hermetically attached to the inner member along the outer periphery of the inner member, An outer end portion of the outer member is hermetically attached to the outer member along an inner periphery of the outer member. relative A flexible cylindrical rolling seal member that is raised and lowered in the horizontal gap in accordance with the position and forms a gas-enclosed space from the horizontal gap to the outer member and the inner member. And a vertically extending support member between the base and the object to be subjected to vibration isolation through horizontal movement guide means for guiding relative horizontal movement in the front, rear, left and right directions. An anti-vibration device characterized by interposing a vertical movement guide means for guiding relative vertical movement between the target and an object. 2. A joint member for allowing a horizontal rotation of the vibration-isolated object is interposed between the vertical movement guide means and the support member or the vibration-isolated object. The vibration isolator described in.