JP2004100929A - Trigger mechanism and base isolating apparatus for lightweight structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a trigger mechanism and a base isolating apparatus for a lightweight structure, compact with simple structure, and to provide the base isolating apparatus for the lightweight structure of high workability of construction, maintenance, and the like. <P>SOLUTION: In this trigger mechanism 112, a filling space 140 surrounded by a partition wall 128, an intermediate cylinder body 130, a rubber cylinder body 138 and a mounting plate 120 is filled with a viscous fluid 142, and the center of the partition wall 128 is formed with a rupture part 144 not ruptured when input for causing the relative approach of the mounting plate 120 and a mounting cylinder body 122 does not exceed a prescribed value, but ruptured when the input exceeds the prescribed value. A conventional cavity and filler are dispensed with, and since the trigger mechanism 112 is arranged at a sidewall 108S of a detached house, workability of construction, maintenance, and the like is enhanced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a trigger mechanism and a seismic isolation device for a lightweight structure.
[0002]
[Prior art]
2. Description of the Related Art Seismic isolation devices that support a lightweight structure (supported member) with respect to a supporting member by seismic isolation are known. In such a seismic isolation device, a trigger mechanism may be provided so that the lightweight structure and the support member do not inadvertently move relative to each other with a force (for example, a strong wind) lower than an expected earthquake. FIG. 10 shows an example of a trigger mechanism (see Patent Document 1).
[0003]
In the trigger mechanism 12, an upper base plate 20 and a lower base plate 22 are fixed to the upper structure 14 and the lower structure 16 via anchor bolts 18, respectively. The lower receiving member 26 is fixed. In addition, a trigger member 28 provided with a break portion 30 is provided between the upper receiving member 24 and the lower receiving member 26. Further, a gap 34 is formed between the trigger member 28 and the peripheral wall of the hole 32 of the lower receiving member 26, and the gap 36 is filled with the filler 36.
[0004]
In the trigger mechanism 12, the minute displacement between the upper structure 14 and the lower structure 16 can be absorbed by the gap 34. On the other hand, with respect to a load having a high speed such as a large earthquake, the rigidity of the filler 36 (a viscous body or a viscoelastic body) increases, so that a horizontal shear force acts on the trigger material 28. When the load exceeds a predetermined value, the trigger member 28 breaks at the break 30 and the upper structure 14 moves.
[0005]
As described above, in the conventional trigger mechanism 12, the gap 34 is provided in order to absorb the minute displacement between the upper structure 14 and the lower structure 16, and a shear force is applied to the trigger member 28 at a high-speed load. Therefore, it is necessary to fill the filler 36, and the structure is complicated or large.
[0006]
Further, in the seismic isolation device employing the trigger mechanism 12, the trigger mechanism 12 is disposed between the upper structure 14 and the lower structure 16, so that construction work, maintenance work, and the like can be performed between these structures. It had to be done and workability was bad.
[0007]
[Patent Document 1]
JP 2001-279952 A
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION It is a first object of the present invention to provide a trigger mechanism having a small and simple structure and a light-weight seismic isolation device for a structure. A second object is to obtain a light-weight seismic isolation device having high workability such as construction and maintenance.
[0009]
[Means for Solving the Problems]
According to the first aspect of the present invention, a fluid member is sealed therein, and a cylinder member is disposed between the support member and the lightweight structure so as to be able to expand and contract in a substantially horizontal direction, and the cylinder member and the support member or the lightweight structure. And limiting means for restricting the expansion and contraction of the cylinder member when the input is equal to or less than a predetermined value, and permitting the expansion and contraction when the input exceeds the predetermined value.
[0010]
In the trigger mechanism of the present invention, when the support member and the lightweight structure are going to move relative to each other in the horizontal direction and a force for expanding and contracting the cylinder member is input, if the input is equal to or less than a certain value, the limit is applied. The expansion and contraction of the cylinder member is restricted by the means. As a result, the resistance of the fluid acts on the relative movement between the support member and the lightweight structure. Therefore, when the lightweight structure tries to vibrate finely with respect to the support member due to, for example, a strong wind, the fine vibration is absorbed. Is done.
[0011]
When the input exceeds a certain value, the restricting means allows the cylinder member to expand and contract, so that the cylinder member expands and contracts, and the support member and the lightweight structure relatively move in the horizontal direction.
[0012]
As described above, the trigger mechanism of the present invention includes the cylinder member in which the fluid is sealed, and when the input is equal to or less than the predetermined value, the expansion and contraction of the cylinder member is restricted by the restricting means. There is no need to form voids or fill with a filler. For this reason, a small and simple structure can be obtained.
[0013]
As the restriction member, for example, as described in claim 2, an opening plate that constitutes a part of the storage portion that stores the fluid, and has a break portion that breaks due to a rise in the internal pressure of the fluid and flows out the fluid. The restricting unit may form a part of a storage unit that stores the fluid, and may include a moving member that is movable by an internal pressure of the fluid, as described in claim 3. An elastic member for applying a restoring force for restoring the moving member to a predetermined position when the moving member moves from the predetermined position.
[0014]
According to the fourth aspect of the present invention, the light-weight structure is supported on the support member so as to be relatively movable in the horizontal direction, and the deformable member is elastically deformed by the relative movement in the horizontal direction. And the trigger mechanism according to any one of (1) to (3).
[0015]
In this seismic isolation device for a lightweight structure, the deformable member supports the lightweight structure so as to be relatively movable in the horizontal direction on the support member. Then, when the deformable member is elastically deformed by the relative movement, the elastic force acts as a restoring force for returning the lightweight structure to the initial position with respect to the support member.
[0016]
In addition, this lightweight structure seismic isolation device has the trigger mechanism according to any one of claims 1 to 3, and can be a small and simple trigger mechanism. Thus, a simple structure can be achieved also as a light-weight structure seismic isolation device.
[0017]
According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the trigger mechanism is attached to a side wall of the lightweight structure.
[0018]
In this way, by attaching the trigger mechanism to the side wall of the lightweight structure, there is no need to work between the lightweight structure and the support member, and the workability is excellent.
[0019]
The “supporting member” here may be a member that supports a lightweight structure through a bearing, and includes, for example, a foundation, a foundation, and a ground of a general detached house. Examples of the “lightweight structure” include a detached house, a temporary house, a small plant, various facilities such as experimental facilities, various apparatuses such as experimental apparatuses, and the like. The weight of these lightweight structures is preferably 200 tons or less, more preferably 100 tons or less. The footprint of lightweight construction, preferably 500 meters ² or less, more preferably 300 meters ² or less.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a seismic isolation device 102 for a lightweight structure according to the first embodiment of the present invention, which is composed of a building foundation 106 (ground) which is an example of a support member, and a steel frame of a detached house 104 which is an example of a lightweight structure. The state where it was arranged between the gantry 108 (or PC board) is shown. The light-weight seismic isolation device 102 includes a restoring member 110 and a trigger mechanism 112. A recess 106D is formed in the building foundation 106, and the lower portion of the detached house 104 (around the steel frame 108) is accommodated in the recess 106D.
[0021]
The restoration member 110 has an upper flange 114 fixed to the steel gantry 108 and a lower flange 116 fixed to the building foundation 106, between which a laminated rubber body 118 is arranged and fixed. Have been.
[0022]
The laminated rubber body 118 is formed by alternately laminating a plate-like rubber and a plate-like metal plate in the thickness direction, and supports the load of the detached house 104 and a shear force in a horizontal direction. Thus, it is elastically deformed and exerts an elastic force. Therefore, when the detached house 104 relatively moves in the horizontal direction with respect to the building foundation 106 due to, for example, an earthquake or the like, the laminated rubber body 118 is sheared and deformed, and the detached house 104 and the building foundation 106 are restored to the original relative position. Apply force.
[0023]
A plurality of laminated rubber bodies 118 are arranged between the building foundation 106 and the detached house 104, and the load of the detached house 104 can be supported substantially equally by each laminated rubber body 118. Although only two laminated rubber bodies 118 are shown in FIG. 1, it is preferable that the number is four or more.
[0024]
As shown in detail in FIG. 2, the trigger mechanism 112 is not shown on the mounting plate 120 attached to the side wall 108S of the detached house 104 with bolts or the like (not shown) and on the inner surface 106S of the concave portion 106D of the building foundation 106. And a bottomed cylindrical mounting cylinder 122 that is mounted with bolts or the like. A communication hole 126 is formed in the cylindrical portion 124 of the mounting cylinder 122 so that air can flow in and out of the mounting cylinder 122.
[0025]
A cylindrical intermediate cylinder 130 is fixed to the mounting cylinder 122 with a bolt 132 via a partition wall 128. An inner flange 134 is formed at an intermediate portion of the intermediate cylinder 130, and a central hole of the inner flange 134 serves as an orifice 136.
[0026]
A cylindrical rubber cylindrical body 138 is disposed between the inner flange 134 and the mounting plate 120, and is fixed to the inner flange 134 and the mounting plate 120. A space surrounded by the partition wall 128, the intermediate cylindrical body 130, the rubber cylindrical body 138, and the mounting plate 120 is a filling space 140, and the filling space 140 is filled with a viscous fluid 142 (or a predetermined material such as a viscous body or a viscoelastic body). (A fluid having viscosity).
[0027]
In the center of the partition wall 128, a break portion 144 having a locally reduced thickness is formed in the partition wall 128. The strength of the breaking portion 144 is set such that the breaking portion 144 is broken when the pressure acting on the partition wall 128 from the viscous fluid 142 exceeds a predetermined value. When an input that causes the mounting plate 120 and the mounting cylinder 122 to approach each other relatively is applied and the input does not exceed a predetermined value, the breaking portion 144 is not broken as shown in FIG. At this time, the rubber cylinder 138 slightly expands, and the volume of the filling space 140 is kept constant.
[0028]
On the other hand, when the input that causes the mounting plate 120 and the mounting cylinder 122 to relatively approach each other exceeds a predetermined value, the internal pressure of the viscous fluid 142 increases, and as shown in FIG. The viscous fluid 142 is broken and flows out of the mounting cylinder 122. Accordingly, resistance does not occur with respect to the relative approach between the mounting plate 120 and the mounting cylinder 122, and these approaches are allowed.
[0029]
A plurality of trigger mechanisms 112 are arranged so as to surround the detached house 104 when viewed in a plan view, and the above operation is performed regardless of the direction of relative movement between the building foundation 106 and the detached house 104. To play. Although only two trigger mechanisms 112 are shown in FIG. 1, for example, in a detached house having a substantially rectangular shape in plan view, at least four trigger mechanisms 112 are arranged in directions perpendicular to the four side walls of the detached house. It is preferable to arrange them.
[0030]
In the seismic isolation device 102 for a lightweight structure according to the first embodiment having such a configuration, the laminated rubber body 118 supports the steel frame 108 of the detached house 104 on the building foundation 106.
[0031]
Due to an earthquake, wind, or the like, a force may be applied to move the detached house 104 relative to the building foundation 106 in the horizontal direction. Here, in the case of a strong wind or an extremely weak earthquake, for example, the detached house 104 tends to vibrate slightly with respect to the building foundation 106. As a result, the detached house 104 attempts to approach the inner side surface 106S of the specific concave portion 106D of the building foundation 106, so that the mounting plate 120 and the mounting cylinder 122 are relatively approached to the corresponding trigger mechanism 112. Power is input. If this force is equal to or less than the predetermined value, the breaking portion 144 is not broken. Since the approach between the mounting plate 120 and the mounting cylinder 122 is restricted and the input is also absorbed, the micro vibration between the building foundation 106 and the detached house 104 is also absorbed within this restricted range.
[0032]
On the other hand, when the force for moving the detached house 104 relative to the building foundation 106 in the horizontal direction is large, such as a relatively large earthquake, that is, the mounting plate 120 and the mounting cylinder 122 are relatively moved. When the input for approaching exceeds a predetermined value, the breaking portion 144 is broken by the increase in the internal pressure of the viscous fluid 142, and the viscous fluid 142 flows out into the mounting cylinder 122. At this time, since the air in the mounting cylinder 122 flows out of the communication hole 126 to the outside, the viscous fluid 142 smoothly flows into the mounting cylinder 122. No resistance is caused to the relative approach between the mounting plate 120 and the mounting cylinder 122, and these approaches are allowed, so that the relative movement of the building foundation 106 and the detached house 104 in the horizontal direction is also allowed. You. As a result, the laminated rubber body 118 is elastically deformed to exert a restoring force for returning the detached house 104 and the building foundation 106 to the initial relative position, and absorb the energy of the relative movement.
[0033]
As described above, in the trigger mechanism 112 of the present embodiment, in order to absorb the input when the input is equal to or less than the predetermined value, it is not necessary to provide a gap or fill the filler as in the related art. Therefore, the trigger mechanism 112 can have a small and simple structure. The light-weight structure seismic isolation device 102 can also have a simple structure.
[0034]
In the seismic isolation device 102 for a lightweight structure of the present embodiment, the trigger mechanism 112 is disposed between the side wall 108S of the detached house 104 and the inner surface 106S of the recess 106D of the building foundation 106. Since it is not disposed between the bottom of the detached house 104 and the building foundation 106 as in the related art, the workability of work such as construction and maintenance is enhanced.
[0035]
FIG. 5 shows a trigger mechanism 152 according to a second embodiment of the present invention. Hereinafter, the same components, members, and the like as those of the trigger mechanism 112 of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. Also, in the seismic isolation device for a lightweight structure having the trigger mechanism 152 according to the second embodiment, the trigger mechanism 112 in the seismic isolation device 102 for the lightweight structure according to the first embodiment is replaced with the trigger mechanism 152 according to the second embodiment. Since it is configured instead, detailed description and illustration thereof are omitted.
[0036]
In the trigger mechanism 152, the mounting cylinder 122 and the intermediate cylinder 130 of the first embodiment are integrated, and a piston 154 is provided inside the cylinder portion 124 instead of the partition 128 of the first embodiment. Are located. A seal 156 is fixed around the piston 154, and moves in the axial direction while maintaining a close contact state with the inner surface of the mounting cylinder 122. A space surrounded by the piston 154, the intermediate cylinder 130, the rubber cylinder 138, and the mounting plate 120 is a filling space 140.
[0037]
A coil spring 158 is disposed between the bottom plate 122B of the mounting cylinder 122 and the piston 154. Coil spring 158 keeps piston 154 in place. When the input for causing the mounting plate 120 and the mounting cylinder 122 to relatively approach each other does not exceed a predetermined value, a restoring force is applied to the piston 154 by elasticity to move the piston 154, as shown in FIG. Is urged toward the mounting plate 120 so that is extremely small (substantially hardly moves). At this time, similarly to the trigger mechanism 112 of the first embodiment, the rubber cylinder 138 slightly expands, and the volume of the filling space 140 is kept constant.
[0038]
On the other hand, when the input that causes the mounting plate 120 and the mounting cylinder 122 to relatively approach each other exceeds a predetermined value, the piston 154 is pressed by the internal pressure of the viscous fluid 142, and the coil spring 158 resists this internal pressure. Thus, the movement of the piston 154 in the direction of the bottom plate 122B is permitted. Thereby, relative approach between the mounting plate 120 and the mounting cylinder 122 is allowed.
[0039]
Therefore, in the trigger mechanism 152 of the second embodiment, similarly to the trigger mechanism 112 of the first embodiment, a force that causes the mounting plate 120 and the mounting cylinder 122 to relatively approach each other due to an earthquake or wind is input. Then, when this force is equal to or less than a predetermined value, as shown in FIG. 6, the approach between the mounting plate 120 and the mounting cylinder 122 is restricted, and the input is also absorbed. Micro vibration between the building foundation 106 and the detached house 104 is also absorbed. When this input exceeds a predetermined value, as shown in FIG. 7, the internal pressure of the viscous fluid 142 causes the piston 154 to move, and the relative approach between the mounting plate 120 and the mounting cylinder 122 is allowed. Therefore, relative movement in the horizontal direction between the building foundation 106 and the detached house 104 is also allowed. As a result, the laminated rubber body 118 is elastically deformed to exert a restoring force for returning the detached house 104 and the building foundation 106 to the initial relative position, and absorb the energy of the relative movement.
[0040]
As described above, the trigger mechanism 152 according to the second embodiment can also have a small and simple structure, and can have a simple structure as a light-weight structure seismic isolation device.
[0041]
Further, in the trigger mechanism 152 according to the second embodiment, since there is no member that breaks during operation, it can be repeatedly operated.
[0042]
FIG. 8 shows a trigger mechanism 172 according to the third embodiment. Also in the third embodiment, the same components, members, and the like as those of the trigger mechanism 112 of the first embodiment are denoted by the same reference numerals, and detailed description is omitted. Also, in the seismic isolation device for a lightweight structure having the trigger mechanism 172 of the third embodiment, the trigger mechanism 112 in the seismic isolation device 102 of the light structure of the first embodiment is replaced with the trigger mechanism 172 of the second embodiment. Since it is configured instead, detailed description and illustration thereof are omitted.
[0043]
In the trigger mechanism 172, a rod 174 and a piston 176 are provided instead of the inner flange 134 and the rubber cylinder 138 of the first embodiment. One end of the rod 174 is fixed to the mounting plate 120, penetrates a through hole 178 formed in the intermediate cylinder 130, and the other end is fixed to the piston 176. The piston 176 has a flow hole 180 that allows the viscous fluid 142 to flow. The space between the through hole 178 and the rod 174 is sealed by a sealant 182 to prevent the viscous fluid 142 from leaking while allowing the rod 174 to move in the axial direction.
[0044]
Therefore, also in the trigger mechanism 172 of the third embodiment, similarly to the trigger mechanism 112 of the first embodiment, a force that causes the mounting plate 120 and the mounting cylinder 122 to approach each other due to an earthquake, wind, or the like is input. Then, when this force is equal to or less than the predetermined value, the breaking portion 144 is not broken. Since the approach between the mounting plate 120 and the mounting cylinder 122 is restricted and the input is also absorbed, the micro vibration between the building foundation 106 and the detached house 104 is also absorbed within this restricted range. When this input exceeds a predetermined value, the breaking portion 144 is broken by the rise in the internal pressure of the viscous fluid 142, and the relative approach between the mounting plate 120 and the mounting cylinder 122 is allowed. Relative movement in the horizontal direction with the detached house 104 is also allowed. As a result, the laminated rubber body 118 is elastically deformed to exert a restoring force for returning the detached house 104 and the building foundation 106 to the initial relative position, and absorb the energy of the relative movement.
[0045]
As described above, the trigger mechanism 172 of the third embodiment can also have a small and simple structure, and also can have a simple structure as a lightweight structure seismic isolation device.
[0046]
In the above description, as a deformable member constituting the seismic isolation device for a lightweight structure of the present invention, the action of supporting the load of the lightweight structure (detached house 104), the lightweight structure and the supporting member (the building foundation 106) are described. Although the laminated rubber member 118 having the two functions of exerting a restoring force with respect to the relative movement has been described as an example, two types of members each having the two functions described above may be arranged. For example, two types of members having different functions are provided, such as a bearing (sliding bearing, rolling bearing, etc.) for supporting the load of a lightweight structure, and a restoring member (rubber body) for exerting a restoring force. You may. In this configuration, since the load of the lightweight structure does not act on the restoring member, the restoring force can be more effectively exerted.
[0047]
Further, the number and arrangement of the laminated rubber body 118 and the trigger mechanisms 112, 152, 172 are not limited to those described above. That is, by optimizing the number and arrangement of these elements, it is possible to relatively easily obtain the optimum characteristics required for them.
[0048]
Further, the trigger mechanism 112 (or the trigger mechanisms 152 and 172) may be arranged as shown in FIG. In the example shown in FIG. 9, instead of providing the recess 106D (see FIG. 1) in the building foundation 106, a mounting block 184 is installed outside the detached house 104, and the mounting block 184 and the detached house 104 In between, a trigger mechanism 112 is attached. The mounting block 184 may be installed only at the position where the trigger mechanism 112 is arranged, and there is no need to form the concave portion 106D.
[0049]
【The invention's effect】
Since the present invention is configured as described above, it is possible to obtain a small and simple trigger mechanism and a lightweight seismic isolation device for a structure. In addition, it is possible to obtain a light-weight structure seismic isolation device having high workability such as construction and maintenance.
[Brief description of the drawings]
FIG. 1 is a front view showing a detached house using a lightweight structure seismic isolation device according to a first embodiment of the present invention.
FIG. 2 is a sectional view showing a trigger mechanism according to the first embodiment of the present invention.
FIG. 3 is a sectional view showing a trigger mechanism according to the first embodiment of the present invention.
FIG. 4 is a sectional view showing a trigger mechanism according to the first embodiment of the present invention.
FIG. 5 is a sectional view showing a trigger mechanism according to a second embodiment of the present invention.
FIG. 6 is a sectional view showing a trigger mechanism according to a second embodiment of the present invention.
FIG. 7 is a sectional view showing a trigger mechanism according to a second embodiment of the present invention.
FIG. 8 is a sectional view showing a trigger mechanism according to a third embodiment of the present invention.
FIG. 9 is a front view showing another example of the arrangement structure of the trigger mechanism in the light-weight structure seismic isolation device of the present invention.
FIG. 10 is a sectional view showing a conventional trigger mechanism.
[Explanation of symbols]
102 Lightweight seismic isolation device 104 Detached house (lightweight structure)
106 Building foundation (supporting members)
108 Steel Frame (Lightweight Structure)
110 Restoration member (deformation member)
112 Trigger mechanism 128 Partition wall (opening plate)
130 Intermediate cylinder (cylinder member)
138 Rubber cylinder (cylinder member)
142 viscous fluid (fluid)
144 Breaking part 152 Trigger mechanism 154 Piston (moving member)
158 Coil spring (elastic member)
172 Trigger mechanism

Claims (5)

A cylinder member in which fluid is sealed inside, and which is arranged to be able to expand and contract in a substantially horizontal direction between the support member and the lightweight structure,
Limiting means disposed between the cylinder member and the support member or the lightweight structure, restricting the expansion and contraction of the cylinder member when the input is equal to or less than a certain value, and allowing the input and output when the input exceeds a certain value,
A trigger mechanism comprising: An opening plate in which the limiting means constitutes a part of a storage portion for storing the fluid, and a break portion is formed in which a break portion for breaking out due to an increase in the internal pressure of the fluid and allowing the fluid to flow out is formed
The trigger mechanism according to claim 1, wherein A moving member that forms a part of the storage section that stores the fluid, and that is movable by an internal pressure of the fluid,
An elastic member for applying a restoring force for restoring the moving member to a predetermined position when the moving member moves from the predetermined position;
The trigger mechanism according to claim 1, further comprising: A deformable member that elastically deforms the lightweight structure while supporting the lightweight structure on the support member so as to be relatively movable in the horizontal direction,
A trigger mechanism according to any one of claims 1 to 3,
A seismic isolation device for a lightweight structure, characterized by having: The seismic isolation device for a lightweight structure according to claim 4, wherein the trigger mechanism is attached to a side wall of the lightweight structure.

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