JP2002349091A - Trigger mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trigger mechanism, which dispenses with a commonly used power source for electric control, etc., and enables resetting without requiring replacement of a trigger component after the activation of a trigger. SOLUTION: This trigger mechanism is equipped with a columnar sliding member 6, a holding member 7 for holding the sliding member 6 in a slidably sandwiching manner, and a fastening means 8 for fastening the holding member 7 so as to press the sliding member 6 in a sandwiching manner. Coupling members 9 and 11 having universal joints 9c and 11c are coupled to ends, in a direction opposite to a sliding direction, of the sliding member 6 and the holding member 7, respectively. An end of one of the coupling members 9 and 11 is fixed to either a foundation surface 1 or a structure 2, and an end of the other coupling member 9 or 10 is fixed to the other one of the foundation surface 1 and the structure 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolator installed between a structure such as a building or a bridge and a foundation surface, and the structure swings due to a small or medium-sized earthquake or strong wind. The present invention relates to a trigger mechanism that suppresses the occurrence of an error.

[0002]

2. Description of the Related Art In the case of using a well-known slip bearing composed of two sliding members that slide horizontally with each other as a seismic isolation device for a light-weight structure, the yield load of the slip bearing is reduced by a small-to-medium earthquake, strong wind, Must be larger than the load. For this purpose, there is a method in which the weight of the structure is increased to increase the yield load of the slide bearing. However, this method involves the cost of increasing the weight of the structure. There is also a method of increasing the yield load of the sliding bearing by increasing the friction coefficient between the two members of the sliding bearing. However, this method uses a seismic isolation method in the event of a large earthquake because the friction coefficient between the members becomes large. There is a problem that the effect is reduced. Therefore, generally, it is considered to install a trigger mechanism for preventing the seismic isolation effect with respect to an external force less than a certain level.

As this kind of trigger mechanism in the prior art, for example, as disclosed in Japanese Patent Application Laid-Open No. H11-247923, a columnar bullet is provided near a seismic isolation device installed between the ground and a building. There is a structure in which a plastic body (lead column) is vertically arranged and both ends of the elasto-plastic body are fixed to the ground and a building, respectively. When the value is equal to or more than a predetermined value, plastic breaking is utilized.

For example, as shown in Japanese Patent Application Laid-Open No. Hei 9-221935, an anemometer is installed on a building to activate a damper device when a wind speed exceeding a set value is measured. As disclosed in Japanese Patent No. 2128, an earthquake detector is installed on the ground, and when an earthquake motion of a predetermined value or more is detected, the means for stopping the displacement of the building relative to the ground is released electrically and mechanically. Methods of operation etc. are known.

[0005]

However, the above-mentioned prior art has the following problems to be solved.
That is, once the trigger mechanism operates, it is necessary to replace, for example, a broken elasto-plastic body (lead column). That is,
Trigger parts cannot be reused. In addition, each of them has a complicated structure, and it is necessary to secure a power supply source in the electrically controlled trigger mechanism.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and does not require a regular power supply for electric control or the like.
An object of the present invention is to provide a trigger mechanism that can be reset without requiring replacement of a trigger component after a trigger operation.

[0007]

To achieve the above object, the present invention employs the following constitution.

<Structure 1> A trigger mechanism installed near a seismic isolation device installed between a foundation surface and a structure, wherein a pillar-shaped sliding member is slidably sandwiched. A connecting member having a universal joint at opposite ends of the sliding member and the holding member in the sliding direction, comprising: a holding member to be attached; and fastening means for tightening the holding member so as to press the sliding member. Respectively connected, the tip of the one connecting member is fixed to one of the base surface and the structure, and the tip of the other connecting member is fixed to the other of the base surface and the structure. A trigger mechanism characterized in that: According to the trigger mechanism configured as described above, the frictional resistance between the sliding member and the holding member is appropriately adjusted by adjusting the tightening force of the tightening means. Suppression of relative fluctuations, and with respect to external force exceeding a certain level such as a large earthquake, the sliding member moves and escapes from the holding member so that the seismic isolation function of the seismic isolation device can be exhibited 100%. Can be. After the trigger operation, resetting is possible without replacing parts such as the sliding member and the holding member.

<Structure 2> In the trigger mechanism according to Structure 1, the holding member includes at least two plate-like members that slidably hold the sliding member from both sides, and the fastening means includes: A trigger mechanism, wherein a fastening bolt is inserted into a through hole provided between opposing surfaces of each of the plate-like bodies. The frictional resistance between the holding member and the sliding member can be easily adjusted by the degree of tightening of the tightening bolt.

<Structure 3> In the trigger mechanism according to Structure 1 or 2, a universal joint of each of the connecting members of the sliding member and the holding member is disposed at an intermediate portion of each of the connecting members. A trigger mechanism. With such a configuration, when an external force exceeding a certain level such as a large earthquake is generated to start relative horizontal fluctuation between the foundation surface and the structure, the connecting members are appropriately bent by the universal joint, and the clamping is performed. The sliding member moves smoothly with respect to the member. <Structure 4> In the trigger mechanism according to Structure 1 or 2, the universal joints of the connection members of the sliding member and the holding member are respectively provided at the joints between the base surface and the structure and the connection members. A trigger mechanism, which is provided. With this configuration, substantially the same effects as in Configuration 3 can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using specific examples. FIG. 1 shows a conceptual diagram of a seismic isolation device and a trigger mechanism thereof according to an embodiment of the present invention. In FIG. 1, a seismic isolation device 3, a restoration rubber 4, and a trigger mechanism 5 in the vicinity thereof are installed between a base surface 1 and a building 2. The seismic isolation device 3 is a well-known sliding bearing including a sliding plate 3a arranged on the base surface 1, a sliding member 3b sliding on the sliding plate 3a, and a holding body 3c holding the sliding member 3b. It is.

The restoring rubber 4 is a well-known laminated rubber body in which a rubber plate and a metal plate are alternately laminated, and restores the relative position of the sliding plate 3a of the sliding bearing 3 and the sliding member 3b after the horizontal movement. Has the role of causing The trigger mechanism 5 is configured as shown in FIGS. That is, a fastening means including a columnar sliding member 6, a sandwiching member 7 for sandwiching the sliding member 6 slidably in the vertical direction, and a fastening bolt for fastening the sandwiching member 7 at two places so as to sandwich the sliding member 6. 8 is provided.

The sliding member 6 is formed in a quadrangular prism or a cylindrical shape by using a fluororesin, an epoxy resin, a hard rubber, wood, or the like, and a connecting member 9 is connected to a lower end portion. Connecting member 9 connects two rods 9a and 9b to universal joint 9c.
The tip of one of the rods 9a is fixed to the base surface 1, and the tip of the other rod 9b is fixed to the center of the lower end surface of the sliding member 6. The holding member 7 is formed in an inverted U shape by a metal or plastic plate, and has an internal space that matches the outer shape of the sliding member 6.
A vertical groove 10 for fitting the sliding member 6 and sliding accurately in the up and down direction is provided on the inner side surface of the plate constituting the inner space.

A horizontal through hole is provided at the opening end of the plate of the holding member 7, and a tightening bolt 8 is inserted through the through hole between the open ends of the plate. Tightening bolt 8
, The plate body of the holding member 7 is deformed in a direction to close the opening end portion, and presses the sliding member 6. Further, a connecting member 11 is connected to the upper end of the holding member 7.

The connecting member 11 includes two rods 11a, 1
1b is joined via a universal joint 11c, and the tip of one rod 11a is fixed to the bottom of the building 2. The universal joints 9a and 11a, as shown,
A sphere is provided at the tip of one of the rods 9a, 11a,
A ball receiver is provided at the distal end of the other rods 9b and 11b, and a ball is rotatably joined to the ball receiver. However, the present invention is not limited to this. It is a matter of course that the well-known configuration may be adopted.

Next, the operation of the trigger mechanism 5 having the above configuration will be described. Even if a relative horizontal force is applied between the foundation surface 1 and the building 2 due to wind power, small and medium earthquakes, etc., when the relative horizontal force is equal to or less than the set value, the sliding member 6 and the holding member 7 are fixed by the frictional force. The relative fluctuation between the base surface 1 and the building 2 is suppressed, and the state of the normal position as shown in FIG. 2 is maintained.

However, when a horizontal force exceeding a set value is applied between the foundation surface 1 and the building 2 due to a large earthquake or the like, a state as shown in FIG. 4 is obtained, and the sliding member 6 is pinched against the frictional force. It comes out of the member 7 and becomes free. Thereafter, the slide bearing 3 performs a predetermined seismic isolation operation. Further, when the relative horizontal force between the foundation surface 1 and the structure 2 is released, the fixed rebound of the restoring rubber 4 causes the sliding bearing 3 to move.
In the direction to return to the origin.

In this manner, the free deformation of the seismic isolation device in the horizontal plane at an arbitrary angle can be made to function as a trigger by restricting the sliding member 6 and the holding member 7 with the tightening force preset by the tightening means 8. This provides a trigger mechanism that does not impair seismic isolation performance and improves the restoring ability of the seismic isolation device. When a set value of compressive force is applied to the sliding member 6, it is controlled by a tightening torque of a tightening bolt or the like so that a predetermined compressive force is applied.

The present invention is not limited to the above embodiment. For example, although not shown, the universal joint 9
a and 11a are not intermediate portions of the connecting members 9 and 11,
They may be disposed directly at the joints between the base surface and the structure and each connecting member, respectively,
Instead of 1 and the universal joints 9a and 11a, the sliding member 6 and the holding member 7 may be connected to the base surface 1 and the building 2 using a wire or a chain. Further, the sliding bearing 3 may be a rolling bearing.

[0020]

According to the trigger mechanism of the present invention described above, the structure is not deformed between the opposing foundation surface and the structure until a certain level of horizontal force is reached, and is caused by the minute external force of the seismic isolation device. In addition to appropriately suppressing sensitive movements, when a horizontal force exceeding a certain value is received, the sliding member moves and slips out of the holding member and is stable without affecting the restoration performance of the seismic isolation device Perform the operation. Further, the trigger mechanism of the present invention has the advantages that the structure is simple, a regular power supply for electric control or the like is not required, and that the trigger mechanism can be reset without replacing the trigger component after the trigger operation.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a seismic isolation device and a trigger mechanism thereof according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the trigger mechanism.

FIG. 3 is a side view of the embodiment.

FIG. 4 is an explanatory diagram showing an operation state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base surface 2 Structure 3 Seismic isolation device 4 Restoration rubber 5 Trigger mechanism 6 Sliding member 7 Nipping member 8 Tightening means 9, 11 Connecting member 10 Vertical groove 9c, 11c Universal joint

Claims (4)

[Claims] 1. A trigger mechanism installed near a seismic isolation device installed between a base surface and a structure, comprising: a pillar-shaped sliding member; and a clamp for slidably sandwiching the sliding member. A member, and a tightening means for tightening the holding member so as to press the sliding member. A connecting member having a universal joint is connected to each of opposite ends of the sliding member and the holding member in the sliding direction. Then, the tip of the one connecting member is fixed to one of the base surface and the structure, and the tip of the other connecting member is fixed to the other of the base surface and the structure. A trigger mechanism characterized by: 2. The trigger mechanism according to claim 1, wherein the holding member includes at least two plate-like members that slidably hold the sliding member from both sides, and the fastening unit includes: A trigger mechanism characterized in that a fastening bolt is inserted into a through hole provided between opposing surfaces of each plate-like body. 3. The trigger mechanism according to claim 1, wherein a universal joint of each of the connecting members of the sliding member and the holding member is provided at an intermediate portion of each of the connecting members. Features a trigger mechanism. 4. The trigger mechanism according to claim 1, wherein a universal joint of each of the connecting members of the sliding member and the holding member is a joint between the base surface and the structure and each of the connecting members. A trigger mechanism, wherein the trigger mechanism is disposed on each of the trigger mechanisms.