JP2002227923A - Trigger mechanism for base isolation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger mechanism of a rail bearing system base isolation equipment that is restored stably by a regular repulsion power of a constant load spring after a trigger movement, retraining properly the sensitive actuation of the rail bearing system base isolation equipment with small rigidity in level direction and doing a stable trigger movement to the base isolation equipment when receiving more external force than fixed value. SOLUTION: It is trigger mechanism that is installed adjacent to the rail bearing system vibration free equipment where sitting astride each linear rail the sliders 5a, 5b, 6a, 6b are arranged in free sliding movement, wherein the linear rails 3a, 3b, 4a, 4b are installed oppositely on the sides of foundation and structure. Either on the foundation side or the structure side, the constant load springs 16a, 16b, 16c, 16d having spring 17 that does not deform until it reaches a certain tensile load value and deforms while always producing the same repulsion power when receiving more tensile load than the fixed value are arranged, and the top end of the spring of these constant load springs is fixed to the slider.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trigger mechanism of a rail-mounted seismic isolation device for isolating a relatively lightweight structure such as a detached house, a display case, and precision equipment.

[0002]

2. Description of the Related Art As a conventional seismic isolation device for a lightweight structure, a linear motion linear guide is used to secure horizontal deformation capability.
A device for restoring the origin by combining this with a coil spring or laminated rubber has been considered. This is because it has a high rigidity in the vertical direction and supports structures that are seismic isolated bodies,
By lowering the stiffness in the horizontal direction, when vibrations due to an external force such as an earthquake are given, the structure is transformed in the horizontal direction and then restored to the origin.

[0003] However, in any case, when the horizontal rigidity is reduced to further improve the seismic isolation performance, even if the seismic isolation device is slightly shaken by a small vibration due to external force such as wind power or human power, the seismic isolation device reacts excessively, It will be deformed. In other words, the improvement of seismic isolation performance and the stability of the equipment are in conflict. The sliding bearing should theoretically not be deformed by a slight vibration because the sliding material itself has a static friction coefficient. However, it is known that the slip material deteriorates due to repeated vibrations and the friction coefficient changes.

[0004] The use of a sliding bearing in a seismic isolation device with the expectation of the function of countermeasures against minute vibrations acts in a direction that impairs the seismic isolation performance, and it cannot be said that stable performance can be exhibited. Therefore, in order to exhibit the excellent performance in the sliding bearing seismic isolation, it is necessary to install a trigger mechanism for preventing the seismic isolation action against an external force of a certain value or less together with the seismic isolation device.

[0005] As a trigger mechanism in the prior art,
For example, as disclosed in Japanese Patent Application Laid-Open No. H11-247923, a columnar elasto-plastic body (lead column) is vertically arranged near a seismic isolation device installed between the ground and a building, There is a structure in which both ends of a plastic body are fixed to the ground and the building, respectively, and the elasto-plastic body is plastically deformed when the horizontal vibration energy is less than a predetermined value, and plastically ruptures when the vibration energy is more than a predetermined value. . Further, for example, Japanese Patent Application Laid-Open No. 9-22
As shown in 1935, an anemometer is installed on a building to activate a damper device when a wind speed equal to or higher than a set value is measured, and further, as shown in JP-A-10-2128, 2. Description of the Related Art A method is known in which an earthquake detector is installed on the ground, and when an earthquake motion of a predetermined value or more is detected, a mechanism for electrically and mechanically operating such that a means for stopping displacement of the building relative to the ground is released.

[0006]

However, the above-mentioned prior art has the following problems to be solved. That is, once the trigger mechanism operates, for example, it is necessary to replace a broken elasto-plastic body (lead column), and resetting of the displacement stop means of the building and maintenance by human power are indispensable. The electrically controlled trigger mechanism has disadvantages such as the need to secure a power supply source. Also,
After the trigger is actuated, coil springs and laminated rubber have been installed and other measures have been taken to restore the seismic isolation device, but in all cases, the overall structure was inevitably complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and appropriately suppresses the excessive operation of a rail-supported seismic isolation device having a small horizontal rigidity, and at the same time, when a large earthquake or the like occurs. A stable trigger operation is performed on the seismic isolation device against external force, and after the trigger operation, a stable repulsion force of the constant load spring is applied without applying excessive spring force to the seismic isolation device. An object of the present invention is to provide a trigger mechanism of a rail-supported seismic isolation device that performs a restoring operation. Although the present invention uses a constant load spring as a trigger, a normal spring, for example, the most common coil spring, has a rebound generated by a spring in both the compression and tension directions as shown by the line a in FIG. The force increases in proportion to the deformation force.
For this reason, if the coil spring is used as a restoring force in a rail bearing type seismic isolation device, the repulsion force of the coil spring is small to act as a trigger during small deformation, and the coil spring is proportional to the deformation during large deformation. A larger repulsive force is generated, which acts to give an excessive restoring force to the device. As a result, the natural period of the device and thus the building is shortened, and as a result, seismic isolation performance is reduced.

As shown by the line b in FIG. 5, the constant load spring hardly deforms until a certain load value is reached, and when a load exceeding the certain value is applied, the constant rebound force is always maintained. It has the property of deforming while being deformed. For this reason, by incorporating a constant load spring that deforms at a load value that exceeds a small load value assuming wind power or human power into a rail-supported seismic isolation device with low horizontal rigidity, the restoration performance and natural period of the seismic isolation device are affected. Thus, it is possible to realize a trigger mechanism that operates only when a load exceeding a certain value is applied without applying the force.

[0009]

The present invention employs the following structure to achieve the above object. <Structure 1> Linear rails are installed facing each other on the foundation side and the structure side, and a slider is slidably arranged between the linear rails. In the trigger mechanism, either the base side or the structure side does not deform until a certain tensile load value is reached, and when receiving a tensile load exceeding the certain value, the same repulsive force is always exerted. A trigger mechanism for a seismic isolation device, comprising: a constant load spring having a spring material that deforms while being generated, wherein a tip of the spring material of the constant load spring is locked to the slider. According to the trigger mechanism configured in this way, the constant load spring suppresses the sway of the structure against wind and small earthquakes, and the structure depends on the deformation load value of the constant load spring for medium earthquakes. The vibration of the object can be suppressed, or the spring material can be deformed to perform the vibration damping by the seismic isolation device. Further, in the case of a large earthquake, the spring material of the constant load spring is deformed and operated, so that the vibration is damped by the seismic isolation device. Further, after the operation, the seismic isolation device can be automatically restored by the repulsive force of the deformed spring material of the constant load spring, so that maintenance such as replacement and resetting of the trigger component is unnecessary.

<Structure 2> In the trigger mechanism of the seismic isolation device according to Structure 1, the constant load spring has a structure in which a tape-shaped spring material is wound around a drum, and the spring material has a certain tension. It is stationary until the load value is reached,
When a tensile load exceeding the predetermined value is applied, the trigger mechanism of the seismic isolation device is sequentially pulled out from the drum while always maintaining the same repulsive force. With this configuration, the constant load spring maintains a constant repulsive force even during a large deformation, so that an excessive restoring force is not applied to the seismic isolation device. Therefore, the seismic isolation device, and thus the natural period of the building, does not become shorter, and operates as a trigger without lowering the seismic isolation performance.

<Structure 3> In the trigger mechanism of the seismic isolation device according to Structure 1 or 2, stopper members for stopping the movement of the slider are provided at both ends and an intermediate portion of the linear rail, and between the stopper members. A trigger mechanism for the seismic isolation device, wherein the sliders are disposed respectively. With this configuration, the movement of the slider can be restricted by the stopper member, and the deformation operation of the constant load spring can be effectively exhibited.

<Structure 4> In the trigger mechanism of the seismic isolation device according to Structure 3, a plurality of the linear rails are respectively installed in parallel on an upper support base and a lower support base opposed to each other. A slider is slidably disposed between the upper and lower supports, and the upper support and the lower support, which are opposed to each other, can relatively move in parallel along the linear rail. Trigger mechanism of the seismic device. With this configuration, the trigger function and the origin restoring function are provided, and the structure of the rail-supported seismic isolation device is simplified.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using specific examples. 1 and 2 show a trigger mechanism of the rail-supported seismic isolation device of the present invention installed between a foundation surface and a structure. 1 and 2, the rail-supported seismic isolation device is configured as follows. That is, the upper support 1 fixed to the structure and the lower support 2 fixed to the base surface are arranged to face each other. A linear rail 3 is provided on each opposing surface of the upper support 1 and the lower support 2.
a, 3b, 4a, and 4b are provided respectively. The linear rails 3a, 3b and 4a, 4b are vertically opposed and arranged in parallel in the same direction. On the opposed linear rails 3a, 3b and 4a, 4b, four sliders 5a, 5b, 6a, 6b are slidably disposed so as to straddle between the vertically opposed linear rails. Although not shown, these sliders 5a, 5b, 6a, and 6b are provided with concave grooves on the upper and lower surfaces to be fitted with the linear rails. A known rolling bearing in the form of a ball or a roller is interposed.

Stoppers 7a, 7b, 8a, 8b, 9a, 9b for stopping the movement of the sliders 5a, 5b are protruded from both ends and intermediate portions of the linear rails 3a, 3b, respectively. Similarly, stopper members 10a, 10b, 11a, 11b, 12a, 12b for stopping the movement of the sliders 6a, 6b at both ends and intermediate portions of the linear rails 4a, 4b.
Are arranged respectively. The upper support base 1 and the lower support base 2 arranged opposite to each other are linear rails 3a, 3b, 4a,
It moves relatively in parallel along 4b.
In the rail bearing type seismic isolation device configured as above,
A trigger mechanism 15 is provided between the lower support 2 and each of the sliders 5a, 5b, 6a, 6b.

The trigger mechanism 15 is configured as follows. That is, the linear rails 4a of the lower support 2
4b, four constant load springs 16a, 16
b, 16c and 16d are arranged (see FIG. 2). These constant load springs 16a, 16b, 16c, 16d
The spring member 17 does not deform until a certain tensile load value is reached, and when receiving a tensile load exceeding the certain value, constantly deforms while maintaining the same repulsive force. The tip of each spring material of the constant load spring is connected to each slider 5a, 5b, 6a, 6
b is locked by a pin 18 or the like.

Constant load springs 16a, 16b, 16c, 16
As d, for example, there is one called Conston (trade name of Samini Corporation). This has a tape-shaped structure in which a tape-shaped spring material 17 is wound around a drum 19 as shown in FIG. 4, and a rotating shaft 20 fitted on the axis of the drum 19 is raised on the lower support base 2. It is attached in the state where it was set. At this time, the tape-shaped spring material 17 is stationary until reaching a certain tensile load value as shown by the line b in FIG. 5, and when a tensile load exceeding the certain value is applied, It has a characteristic that it is sequentially pulled out from the drum 19 while always maintaining the same repulsive force.

Next, the operation of the rail-supported seismic isolation device and the trigger mechanism 15 having the above-described configuration will be described. To the extent that a small external force such as a small earthquake, wind, human power, or the like is applied between the foundation surface and the structure, that is, between the upper support 1 and the lower support 2, the spring material 17 of the constant load spring 16 Does not deform,
The upper support table 1 and the lower support table 2 are kept in their normal positions as shown by solid lines in FIGS. When a large earthquake occurs and a large load is applied between the upper support 1 and the lower support 2, the upper support 1 and the lower support 2 relatively move in the horizontal direction.

Now, it is assumed that the upper support 1 has moved leftward with respect to the lower support 2 as shown in FIG. 3 from the steady state of FIG. 1 due to a large earthquake or the like. In this case, as the upper support 1 moves, the sliders 5b, 6a are stopped by stopper members 8a, 11a fixed to the upper support 1.
b is pushed to the left. Then, the sliders 5b, 6
b are stopper members 9a and 12 fixed to the lower support 2
When it comes into contact with a, the movement of the upper support 1 is stopped. At this time, of the four constant load springs 16a, 16b, 16c, 16d installed in the rail-supported seismic isolation device,
Two constant load springs 1 locked to sliders 5b, 6b
As a result of applying a tensile load equal to or more than a certain value to 6b and 16d, each spring member 17 deforms (extends) while constantly generating a constant repulsive force. On the other hand, the constant load springs 16a,
6c does not operate because the sliders 5a and 6a do not move.

When the relative horizontal movement force between the upper support 1 and the lower support 2 is released, the constant load spring 1 that has been activated.
6b and 16d automatically restore the origin of the sliders 5b and 6b together with the upper support 1 by the constant repulsive force of the spring member 17. Conversely, the upper support 1
Performs the same operation symmetrically to the above operation even when it moves rightward in the figure. Thus, the free deformation of the seismic isolation device in the horizontal plane can always be converted into the deformation in the tension direction for the constant load spring, and the constant load spring can function as a trigger. This provides a trigger mechanism that does not impair seismic isolation performance and improves the restoring ability of the seismic isolation device.

If the rail-supported seismic isolation device and the trigger mechanism having the above-described configuration are rotated in 90 degrees and stacked in two stages, it is possible to move in any direction in the horizontal plane.
In the above embodiment, the configuration in which the linear rail and the stopper member are disposed on the upper support base and the lower support base has been described.However, the present invention is not limited to this. It may be configured to be attached to a foundation including a floor surface or a building structure including a small object directly or via an appropriate member.

[0021]

According to the trigger mechanism of the seismic isolation device according to the present invention described above, a constant load spring is disposed on either the foundation side or the structure side, and the tip of each spring material of the constant load spring is attached. By connecting the linear rail to the sliding slider, the rigid operation of the rail-supported seismic isolation device with low horizontal rigidity is properly suppressed, and the Performs stable trigger operation. In addition, after the trigger is actuated, the constant rebound force of the constant load spring provides an effect of performing a stable restoring operation without applying an excessive spring force to the seismic isolation device. In addition, there is no need for a power source for maintenance such as replacement and resetting of the trigger parts and for electric control, and the effect that the structure is simple can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a trigger mechanism of a seismic isolation device of the present invention.

FIG. 2 is a plan view showing a state where a trigger mechanism is installed on a lower support base in the embodiment.

FIG. 3 is an explanatory diagram showing an operation state of the embodiment.

FIG. 4 is a perspective view showing a constant load spring used in the embodiment.

FIG. 5 is a diagram showing a change in a deflection amount when a tensile load is applied to each of a coil spring and a constant load spring.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1; Upper support stand 2; Lower support stand 3a, 3b, 4a, 4b; Linear rail 5a, 5b, 6a, 6b; Slider 7a, 7b, 8a, 8b, 9a, 9b; Stopper member 10a, 10b, 11a, 11b , 12a, 12b;
Stopper member 15; Trigger mechanism 16a, 16b, 16c, 16d; Constant load spring 17; Spring material 18; Pin 19; Drum 20;

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Noboru Igawa, No. 4-3-55, Konohana-ku, Osaka-shi, Osaka-shi, Konoike-gumi Co., Ltd. No. 1 Showa Electric Wire & Cable Co., Ltd. (72) Inventor Masahide Seki 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture F-term in Showa Electric Wire & Cable Co., Ltd.

Claims (4)

[Claims] 1. A base rail and a structure are provided with linear rails facing each other, and a slider is slidably disposed between the linear rails. In the trigger mechanism provided, either the base side or the structure side does not deform until a certain tensile load value is reached, and when receiving a tensile load exceeding the certain value, the same repulsive force is always obtained. A constant load spring having a spring material that deforms while generating the vibration, and a tip end of the spring material of the constant load spring is locked to the slider. 2. The trigger mechanism according to claim 1, wherein the constant load spring has a structure in which a tape-shaped spring material is wound around a drum, and the spring material has a certain tensile load. The seismic isolation device is characterized in that the seismic isolation device is stationary until reaching a value, and is sequentially pulled out from the drum while always maintaining the same repulsive force when a tensile load exceeding the certain value is applied. Trigger mechanism. 3. The trigger mechanism of the seismic isolation device according to claim 1, wherein stopper members for stopping movement of the slider are provided at both ends and an intermediate portion of the linear rail, and between the stopper members. A trigger mechanism of the seismic isolation device, wherein each of the sliders is arranged. 4. The trigger mechanism of the seismic isolation device according to claim 3, wherein the plurality of linear rails are respectively installed in parallel on the upper support base and the lower support base which are opposed to each other, and between the opposed linear rails. A slider is slidably disposed over the base rail, and the upper support and the lower support, which are opposed to each other, can relatively move in parallel along the linear rail. Device trigger mechanism.