JP5281528B2 - Vertical vibration suppression structure and seismic isolation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To downsize an elastic member by reducing relative displacement of vertical movement of an upper element or a lower element, also to allow stable suppression of vertical vibration, free from a possibility of fall of the upper element or the lower element, and to prevent enlargement while simplifying a structure. <P>SOLUTION: The structure for suppressing vertical vibration is equipped with: a parallel link mechanism 5 having link elements 51, 52, 53 with their one ends connected to the upper element 2 and the other ends connected to the lower element 3, keeping attitudes of the upper element 2 and lower element 3, and allowing the relative displacement between the elements 2, 3; an intermediate member 6 connected between the two link elements 51, 53 and vertically displaced along with rotational motion of the link elements 51, 53 by displacement of the upper element 2 or the lower element 3; and the elastic member 7 provided to intervene between the intermediate member 6 and the lower element 3 for applying elastic return force along with the vertical displacement of the intermediate member 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a structure and a seismic isolation device for suppressing vertical vibration transmitted from one element to another element in an upper element and a lower element connected by a link mechanism (hereinafter referred to as a parallel link mechanism) that realizes parallel movement. It is about.

  Conventionally, as a seismic isolation device for base isolation in the vertical direction, as shown in Patent Document 1, a link mechanism consisting of a long arm and a short arm is provided on a fixing member (lower element) via a fulcrum pin and fixed. The long arm of the link mechanism is connected to a structure (upper element) that moves up and down with respect to the member, and the end of the short arm of the link mechanism is connected to the fixed member via elastic means. And the amount of vertical displacement of the structure is reduced by the ratio of the arm lengths of the link mechanism and is transmitted to the tension type elastic means.

  Since the link mechanism of this seismic isolation device does not have a translation function, a guide mechanism for moving up and down without changing the posture of the structure is required. In the above seismic isolation device, a guide mechanism is constituted by a guide member provided on the structure and a linear guide provided on the fixed member, and this structure suppresses horizontal relative movement between the structure and the fixed member. The link mechanism is configured such that an excessive force in the horizontal direction does not act on the link mechanism.

  However, if a separate guide mechanism is provided in addition to the link mechanism, the structure of the seismic isolation device is complicated, and the seismic isolation device may be increased in size. Moreover, one elastic member is required for one link mechanism, and this also causes a problem that the seismic isolation device may become complicated and large. Furthermore, in order to increase the reduction ratio of the vertical displacement of the structure, it is necessary to lengthen the long arm, and the fulcrum pin supporting the link mechanism and the load shaft (in the vertical direction passing through the connection point between the long arm and the structure) The distance to the (axis) increases. Then, a moment that changes the posture of the structure is applied, the guide member of the guide mechanism and the linear guide interfere with each other, and galling occurs, preventing the smooth vertical movement of the structure. There is also.

JP 2002-130373 A

  Therefore, the present invention was made to solve the above problems all at once, not only reducing the size of the elastic member by reducing the relative vertical vibration displacement of the upper element or the lower element, The main intended problem is to prevent stable enlargement while making it possible to suppress the stable vertical vibration without fear of falling of the upper element or the lower element.

  That is, the vertical vibration suppression structure according to the present invention is provided between the upper element and the lower element, and is a vertical vibration suppression structure that suppresses vertical vibration transmitted from one element to the other element, one end of which is It has at least two link elements connected to the upper element and the other end connected to the lower element, and enables relative movement between the upper element and the lower element while maintaining the posture of the upper element and the lower element. A parallel link mechanism, an intermediate member connected between at least two link elements and moving up and down with the rotational movement of the link element by the movement of the upper element or the lower element; the intermediate member and the upper element or the And an elastic member provided between the lower element and acting as an elastic restoring force as the intermediate member moves up and down.

  In such a case, the vertical movement of the upper element or the lower element is converted into the vertical vibration of the intermediate member by converting the rotational movement of the link element caused by the movement of the upper element or the lower element into the vertical movement again by the intermediate member. Can be reduced. Then, by using the elastic return force of the elastic member on the intermediate member to suppress the reduced vertical vibration, a smaller elastic member is used compared to the case of directly suppressing the vertical vibration of the upper element or the lower element. be able to. In addition, since the upper element and the lower element are connected using a parallel link mechanism, vertical vibration can be suppressed without changing the posture of the upper element and the lower element. For example, the upper element and the lower element can be suppressed. It is possible to prevent the seismic isolation object from falling. Furthermore, since it is not necessary to provide a separate guide mechanism for guiding the upper element or the lower element in the vertical direction, the structure of the structure can be simplified, and there is no need to consider the galling of the guide mechanism as in the past. Smooth vertical movement can be enabled. In particular, since the rotational movement of the plurality of link elements is made common to one vertical movement by the intermediate member, the vertical vibration can be suppressed by only one elastic member. By using the intermediate member, the structure of the elastic member can be simplified as compared with the case where the elastic member is provided for each link element, and the degree of freedom of the arrangement of the elastic member can be given.

  The elastic member is preferably a compression coil spring or an air spring having one end connected to the intermediate member and the other end connected to the upper element or the lower element. The compression coil spring may not function as a coil spring due to buckling when compressed from a direction other than its central axis direction. However, the compression coil spring is not connected to the intermediate member that moves in the vertical direction and the upper element or the lower element. By connecting the spring, the force acting on the compression coil spring can be set in the central axis direction, and buckling of the compression coil spring can be prevented. At this time, in order to make the force acting on the intermediate member symmetrical to the compression coil spring, it is desirable that the compression coil spring is disposed at the center position of the intermediate member. Furthermore, the air spring does not need to consider buckling, and the seismic isolation effect can be further improved as compared with the use of the compression coil spring.

  As a specific embodiment of the parallel link mechanism, the parallel link mechanism includes a first link element, a second link element, and a third link element, and each link element has one end at the upper element. A first arm rotatably connected to the other end, a second arm having one end connected to the other end of the first arm via a joint, and the other end rotatably connected to the lower element; A joint portion of the first link element and a joint portion of the second link element are connected by a connecting member, and an opening angle of the joint portion of the first link element and the second link element; It is desirable that the third link elements are arranged so that the opening angles of the joint portions face each other. In this case, the line (load line) connecting the connection point (upper fulcrum) of the first arm and the connection point (lower fulcrum) of the second arm of each link element is fixed without moving in the horizontal direction. Therefore, there is no need to consider the moment accompanying the sliding movement of the connecting point. Further, by providing the link member with the intermediate member, the fulcrum and the load shaft can be made as close as possible, and the moment relating to the first element or the second element can be made as small as possible.

  It is desirable that the parallel link mechanism further includes an elastic member disposed between the joint portions of the link element that expands and contracts in the horizontal direction as the upper element or the lower element moves. If this is the case, a further lower natural frequency can be obtained, and the vibration suppression effect can be improved. In particular, in the present invention, since the parallel link mechanism using the link element including the first arm and the second arm is used, it is possible to easily secure a space for providing the elastic member.

  Further, the seismic isolation device according to the present invention includes an upper element provided in the seismic isolation object, a lower element provided in a foundation that is a source of vibration, and interposed between the upper element and the lower element. A vertical vibration suppression structure that suppresses vertical vibration transmitted from the lower element to the upper element, the vertical vibration suppression structure having one end connected to the upper element and the other end connected to the lower element A parallel link mechanism having at least two elements and allowing relative movement between the upper element and the lower element while maintaining the posture of the upper element and the lower element; and connected between at least two link elements; Or an intermediate member that moves up and down with the rotational movement of the link element due to the movement of the lower element, and is interposed between the intermediate member and the upper element or the lower element. Characterized by comprising an elastic member which exerts a resilient return force due to the vertical movement of the timber, the.

  In order to reduce the vertical vibration displacement of the seismic isolation object as much as possible and improve the vibration suppression effect, the parallel link mechanism includes a first link element, a second link element, and a third link element. Each link element has one end rotatably connected to the upper element, one end connected to the other end of the first arm via a joint, and the other end A second arm rotatably connected to the lower element, wherein the joint portion of the first link element and the joint portion of the second link element are connected by a connecting member, and the first link element And an opening angle of the joint portion of the second link element and an opening angle of the joint portion of the third link element are opposed to each other, and the intermediate member is connected to the lower element. Connected between the arms of the upper element or the lower element. It is desirable with by moving the rotary motion of the second arm is intended to move up and down.

  According to the present invention configured as described above, the elastic member can be reduced in size by reducing the relative vertical vibration displacement of the upper element or the lower element, and stable without fear of the upper element or the lower element falling. The vertical vibration can be suppressed.

It is a side view which shows typically the structure of the seismic isolation apparatus which concerns on one Embodiment of this invention. It is a front view which shows typically the structure of the seismic isolation apparatus which concerns on the same embodiment. It is a schematic diagram which shows the modification of a parallel link mechanism. It is a schematic diagram which shows the 1st modification of a vertical vibration suppression structure. It is a schematic diagram which shows the 2nd modification of a vertical vibration suppression structure. It is a schematic diagram which shows the 3rd modification of a vertical vibration suppression structure. It is a schematic diagram which shows the 4th modification of a vertical vibration suppression structure.

  An embodiment of a seismic isolation device according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the seismic isolation device 100 according to the present embodiment includes an upper element 2 provided on the seismic isolation object 200, a lower element 3 provided on a foundation 300 such as the ground, and an upper element 2. And a vertical vibration suppressing structure 4 that is provided between the lower element 3 and the lower element 3 and insulates or attenuates the vertical vibration transmitted from the lower element 3 to the upper element 2. The foundation 300 is a source of vibration. For example, when suppressing vibration of a building due to an earthquake, the foundation 300 is a member provided directly on the ground or the ground.

  The vertical vibration suppression structure 4 has three link elements 51, 52, 53 having one end connected to the upper element 2 and the other end connected to the lower element 3, and maintains the posture of the upper element 2 and the lower element 3. The parallel link mechanism 5 that enables relative movement between the elements 51, 52, and 53 and the two link elements 51 and 53 are connected to each other, and the rotational movement of the link elements 51 and 53 is caused by the movement of the upper element 2. An intermediate member 6 that moves up and down with it, a first elastic member 7 that is provided between the intermediate member 6 and the lower element 3 and that acts as an elastic return force as the intermediate member 6 moves up and down, It comprises.

  One or more parallel link mechanisms 5 are provided between the upper element 2 and the lower element 3. Each parallel link mechanism 5 includes a first link element 51, a second link element 52, and a third link element 53 in this order from the left in FIG. Each link element 51, 52, 53 has one end connected to the upper element 2 rotatably at one end, and one end connected to the other end of the first arm 501 via a joint portion 503. The other end of the second arm 502 is rotatably connected to the lower element 3. Although FIG. 1 shows a case where the second link element 52 and the third link element 53 are connected at a common connection point, the present invention is not limited to this.

  As shown in FIG. 1, in the parallel link mechanism 5, the joint portion 503 of the first link element 51 and the joint portion 503 of the second link element 52 are connected by the connecting member 54, and the first link element 51 and the opening angle of the joint part 503 of the second link element 52 and the opening angle of the joint part 503 of the third link element 53 are arranged to face each other. By such a parallel link mechanism 5, the upper element 2 moves up and down only in the vertical direction while maintaining the posture with respect to the lower element 3.

  In addition, the lines (load lines) connecting the connection point (upper fulcrum) of the first arm 501 and the connection point (lower fulcrum) of the second arm 502 of each link element 51, 52, 53 are all vertical. It is set to face the direction. Further, since each connection point is fixed without moving in the horizontal direction, it is not necessary to consider the moment applied to the upper element 2 as the connection point slides.

  Further, the second elastic member 8 is connected to the joint portion 503 of the first link element 51 and the joint portion 503 of the third link element 53. The second elastic member 8 is a tension coil spring having one end connected to the joint portion 503 of the first link element 51 and the other end connected to the joint portion 503 of the third link element 53. The tension coil spring 8 increases as the distance between the joint portion 503 of the first link element 51 and the joint portion 503 of the third link element 53 increases due to the amplitude of the upper element 2 (that is, as the tension coil spring 8 extends). The force acting on the upper element 2 is arranged to decrease. Due to the configuration of the parallel link mechanism 5 of the present embodiment, a large space is formed between the joint portion 503 of the first link element 51 and the joint portion 503 of the third link element 53, so that the tension coil spring 8 is Easy to install.

  The intermediate member 6 is provided in each parallel link mechanism 5 so that the extending direction thereof is horizontal, and one end of the intermediate member 6 is connected to the second arm 502 of the first link element 51 so as to be slidable in the horizontal direction. The other end is connected to the second arm 502 of the third link element 53 so as to be slidable in the horizontal direction. Both end portions of the intermediate member 6 are coupled to the second arm 502 by the slide coupling mechanism 9. Further, the intermediate member 6 is coupled to the substantially central portion of the second arm 502 as shown in FIG.

  The slide connecting mechanism 9 is provided on one of the second arm 502 or the intermediate member 6 and the other of the second arm 502 or the intermediate member 6 so that the connecting pin 91 can slide. And an engaging portion 92 such as a long hole. In the present embodiment, a mode in which the connecting pin 91 is provided on the second arm 502 and the engaging portion 92 is provided on the intermediate member 6 is shown. Moreover, the long hole 92 which is an engaging part is extended in the horizontal direction. In addition, the long hole 92 provided in one end part and the long hole 92 provided in the other end part may be inclined with respect to the horizontal direction as long as they are bilaterally symmetrical. At this time, as shown in FIG. 3, it is desirable that the long hole 92 has an inverted C shape.

  Here, when the upper element 2 moves up and down, the lower fulcrum is rotated at the center of rotation so that the second arm 502 of the first link element 51 and the second arm 502 of the third link element 53 expand and contract each other. As a rotating motion. Then, the connecting pin 91 provided on the second arm 502 slides within the engaging portion 92 provided on the intermediate member 6, whereby the rotational movement of the second arm 502 is converted into the vertical movement of the intermediate member 6. Is done.

  The first elastic member 7 has one end connected to the horizontal center of the intermediate member 6 and the other end connected to the lower element 3 so that the central axis is vertical. The elastic member 7 of the present embodiment uses a compression coil spring. The compression coil spring 7 is arranged so that the intermediate member 6 and the first link element 51 and the third link element 53 are symmetrical with respect to the compression coil spring 7.

Next, the effect | action of the seismic isolation apparatus 100 comprised in this way is demonstrated.
Assuming that the upper element 2 vibrates up and down with an amplitude A, the intermediate member 6 is provided in the center of the second arm 502, and the lengths of the first arm 501 and the second arm 502 are the same. Therefore, the intermediate member 6 is reduced to the amplitude A / 4. Then, A / 4 displacement is generated in the compression coil spring 7 connected to the intermediate member 6, and the elastic restoring force generated thereby is applied to the intermediate member 6. Thereby, the amplitude of the vertical vibration of the upper element 2 can be reduced and reduced to ¼ times. Note that the reduction ratio of the amplitude of the upper element 2 can be adjusted by the installation position of the intermediate member 6.

<Effect of this embodiment>
According to the seismic isolation device 100 according to the present embodiment configured as described above, the rotational movement of the link elements 51 to 53 caused by the movement of the upper element 2 or the lower element 3 is again converted into the vertical movement by the intermediate member 6. The vertical vibration of the upper element 2 or the lower element 3 can be reduced to the vertical vibration of the intermediate member 6. Then, by suppressing the vertical vibration reduced by applying the elastic restoring force of the elastic member 7 to the intermediate member 6, it is smaller than the case of directly suppressing the vertical vibration of the upper element 2 or the lower element 3. The elastic member 7 can be used.

  Moreover, since the upper element 2 and the lower element 3 are connected using the parallel link mechanism 5, the vertical vibration can be suppressed without changing the posture of the upper element 2 and the lower element 3, for example, the upper element 2 can prevent the seismic isolation object 200 placed on the top 2 from falling.

  Furthermore, since it is not necessary to provide a separate guide mechanism for guiding the upper element 2 or the lower element 3 in the vertical direction, it is possible to simplify the structure of the structure and to consider galling of the guide mechanism as in the past. The upper element 2 can be smoothly moved up and down.

  In particular, since the rotational movement of the plurality of link elements 51 to 53 is made common to one vertical movement by the intermediate member 6, the vertical vibration can be suppressed by only one elastic member 7. By using the intermediate member 6, the configuration of the elastic member 7 can be simplified as compared with the case where an elastic mechanism is provided for each of the link elements 51 to 53, and the arrangement of the first elastic member 7 has a degree of freedom. It can also be made.

<Other modified embodiments>
The present invention is not limited to the above embodiment.

  For example, in the embodiment, a compression coil spring is used as the elastic member 7, but an air spring may be used as the elastic member 7. In this case, it is desirable to control the internal pressure in the air spring by connecting a supply / discharge valve to the air spring. Thereby, the seismic isolation effect can be further improved as compared with the case of using the compression coil spring.

  Further, the parallel link mechanism 5 is not limited to the above-described embodiment. For example, the connection points of the first link element 51, the second link element 52, and the third link element 53 are not provided in this order. Instead, as shown in FIG. 4, the connection point of the first link element 51, the connection point of the third link element 53, and the connection point of the second link element 52 may be provided.

  Furthermore, in the parallel link mechanism 5 of the above-described embodiment, the connection points of the link elements are fixed to the upper element 2 and the lower element 3, but in addition, as shown in FIGS. The point may be configured to be slidable in the horizontal direction.

  FIG. 5 shows that the first link element 51 and the second link element 52 are connected to each other so as to be substantially X-shaped, and can be slidably moved at the upper connection point of the first link element 51. And a lower connection point of the second link element 52 is slidably connected. Then, the intermediate member 6 is coupled to the first link element 51 and the second link element 52 by the slide coupling mechanism 9. In addition, in FIG. 4, although the state which provided the 2nd elastic member 8 in the upper connection point vicinity of each link element 51 and 52 is shown, it is not restricted to this. Moreover, in FIG. 4, each link element is comprised from the single arm.

  In FIG. 6, the first link element 51 and the second link element 52 form a parallelogram link, and the third link element 53 is connected to the second link element 52 so as to be symmetrical in the vertical direction. doing. And you may connect the lower connection point of each link element 51,52,53 so that a slide movement is possible. In FIG. 5, each link element is composed of a single arm.

  FIG. 7 shows the parallel link mechanism 5 in the case where the third link element 53 is not provided in the embodiment. In this parallel link mechanism 5, the upper element 2 rotates while maintaining the posture with respect to the lower element 3, and thus a guide mechanism (not shown) for guiding in the vertical direction is necessary. However, since the posture of the upper element 2 is maintained by the parallel link mechanism 5, it is possible to prevent the guide mechanism (not shown) from being gnawed.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

100 ... Seismic isolation device 200 ... Seismic isolation object 300 ... Base 2 ... Upper element 3 ... Lower element 4 ... Vertical vibration suppression structure 5 ... Parallel link mechanism 51 First link element 52 ... second link element 53 ... third link element 54 ... connecting member 501 ... first arm 503 ... joint 502 ... second Arm 6 ... intermediate member 7 ... first elastic member (compression coil spring)
8: Second elastic member (pulling coil spring)

Claims (6)

A vertical vibration suppression structure that is provided between the upper element and the lower element and suppresses vertical vibration transmitted from one element to the other element,
At least two link elements, one end of which is connected to the upper element and the other end of which is connected to the lower element, can be moved relative to each other while maintaining the posture of the upper element and the lower element A parallel link mechanism,
An intermediate member that is connected between at least two link elements and moves up and down with a rotational movement of the link element by movement of the upper element or the lower element;
A vertical vibration suppressing structure comprising: an elastic member that is provided between the intermediate member and the upper element or the lower element and that acts as an elastic restoring force as the intermediate member moves up and down.   The vertical vibration suppressing structure according to claim 1, wherein the elastic member is a compression coil spring or an air spring having one end connected to the intermediate member and the other end connected to the upper element or the lower element. The parallel link mechanism comprises a first link element, a second link element and a third link element;
Each link element has one end rotatably connected to the upper element, one end connected to the other end of the first arm via a joint, and the other end connected to the lower element. A second arm rotatably connected;
The joint portion of the first link element and the joint portion of the second link element are connected by a connecting member, and the opening angle of the joint portion of the first link element and the second link element and the first 3. The vertical vibration suppressing structure according to claim 1, wherein the three link elements are arranged so that the opening angles of the joint portions face each other.   The vertical vibration suppressing structure according to claim 3, wherein the parallel link mechanism further includes an elastic member disposed between joint portions of the link element that expands and contracts in a horizontal direction as the upper element or the lower element moves. An upper element provided in the seismic isolation object;
A lower element provided on the foundation;
A vertical vibration suppression structure that is provided between the upper element and the lower element and suppresses vertical vibration transmitted from the lower element to the upper element;
The vertical vibration suppressing structure has at least two link elements having one end connected to the upper element and the other end connected to the lower element, while maintaining the posture of the upper element and the lower element. A parallel link mechanism that allows relative movement between elements;
An intermediate member that is connected between at least two link elements and moves up and down with a rotational movement of the link element by movement of the upper element or the lower element;
A seismic isolation device, comprising: an elastic member provided between the intermediate member and the upper element or the lower element and acting an elastic return force as the intermediate member moves up and down. The parallel link mechanism comprises a first link element, a second link element and a third link element;
Each link element has one end rotatably connected to the upper element, one end connected to the other end of the first arm via a joint, and the other end connected to the lower element. A second arm rotatably connected;
The joint portion of the first link element and the joint portion of the second link element are connected by a connecting member, and the opening angle of the joint portion of the first link element and the second link element and the first 3 are arranged so that the opening angles of the joint portions of the link elements face each other,
The said intermediate member is connected between the 2nd arms connected with the lower element, and moves up and down with the rotational movement of the said 2nd arm by the movement of the said upper element or the said lower element. Seismic isolation device.