JP2015048644A - Swinging prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swinging prevention device capable of attaining miniaturization.SOLUTION: The swinging prevention device is arranged between a first structure and a second structure, and is used together with a base isolation device for preventing vibration from directly propagating to the other structure from one structure, and comprises a fixed cylinder joined to the first structure, a screw rod having one end joined to the second structure, advancing-retreating in the axial direction and forming a spiral screw groove on an outer peripheral surface, a rotor for constituting a ball screw device together with this screw rod and rotatably supported to the fixed cylinder and a rotation restraining mechanism provided between the fixed cylinder and the rotor, and the rotation restraining mechanism comprises a pin member, a first pin holding part having a through-hole for inserting this pin member and provided in the fixed cylinder and a second pin holding part having an insertion hole opposed to the through-hole of this first pin holding part and provided in the rotor.

Description

  The present invention relates to a shaking prevention device that prevents a building from shaking due to external vibrations such as wind and traffic vibrations other than earthquakes in a building including a seismic isolation device.

  Conventionally, for the purpose of isolating a building from external vibrations such as earthquakes, construction has been carried out to install a seismic isolation device between the building and its building foundation. Since there is a possibility that the building will be shaken by winds other than the above, it is usual to provide a shake prevention device between the building and the building foundation.

  A device disclosed in Patent Document 1 is known as the shaking prevention device. The shake preventing device includes a sphere holding mechanism portion fixed to the building frame, a sphere provided in the sphere holding mechanism portion, a saucer fixed to the building foundation and rolling the sphere, and the sphere holding mechanism portion. And a chamber in which oil is sealed, a hydraulic pressure adjustment mechanism that adjusts the hydraulic pressure in the chamber, and an advance / retreat operating body that moves forward and backward in the vertical direction with respect to the chamber.

  And in the state where the earthquake has not occurred, the vertical movement of the advancing / retracting operation body is restricted, the advancing / retreating operation body and the tray are strongly engaged, and the rolling of the building is prevented. Yes. On the other hand, when an earthquake occurs, the forward / backward movement body is allowed to move in the vertical direction by the action of the hydraulic pressure adjustment mechanism, and the engagement between the forward / backward movement body and the tray is released. As a result, the building is seismically isolated by the seismic isolation device.

JP 2006-105181 A

  However, in the case of a building provided with the shake preventing device, the horizontal external force acting on the building directly acts on the advancing / retracting operation body constituting the shake preventing device. For this reason, in order to reliably prevent the shaking of the building due to winds other than earthquakes, it is necessary to increase the size of the advancing / retreating operation body itself, and accordingly, it is necessary to increase the size of the entire shaking prevention device.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a shake preventing apparatus capable of achieving downsizing.

  That is, the present invention is used with a seismic isolation device that is disposed between a first structure and a second structure and prevents vibration from directly propagating from one structure to the other. A fixed cylinder coupled to the first structure, a screw rod having one end coupled to the second structure and advanced and retracted in the axial direction, and a helical thread groove formed on the outer peripheral surface; The screw rod together with the screw rod constitutes a rotor rotatably supported with respect to the fixed cylinder, and a rotation suppression mechanism provided between the fixed cylinder and the rotor, The rotation suppression mechanism has a pin member, a through hole into which the pin member is inserted, a first pin holding portion provided in the fixed cylinder, and an insertion hole facing the through hole of the first pin holding portion. The second pin provided on the rotor Comprising a holding unit.

  According to the present invention, a couple force that attempts to rotate the rotor by the ball screw device including the rotor and the screw rod is converted into a large axial force that attempts to move the screw rod in the axial direction. Therefore, even if the pin member is small, the first structure or the second structure can be prevented from being shaken by winds other than earthquakes.

It is a half sectional view showing a first embodiment of a shake preventing apparatus to which the present invention is applied. It is a perspective view which shows an example of the combination of a screw rod and a rotor. It is a perspective view which shows an example of the attenuation device to which this invention is applied. It is a perspective view which shows an example of the rotation suppression mechanism with which the damping device shown in FIG. 3 is provided. It is a schematic diagram which shows the example which used the damping device shown in FIG. 3 for the seismic isolation structure of a building.

  Hereinafter, a shake preventing apparatus to which the present invention is applied will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a first embodiment of a shake preventing apparatus to which the present invention is applied. The shake preventing apparatus 1 has a hollow portion and an opening at one end, and is formed in a cylindrical shape, and is inserted into the hollow portion of the fixed tube 2 from the opening end of the fixed tube 2. Provided between the fixed cylinder 2 and the nut member 4, the nut member 4 as a rotor screwed into the screw rod 3 via a large number of balls (not shown), and the fixed cylinder 2 and the nut member 4. Rotation prevention mechanism 5 provided.

  The shaking prevention device 1 is used in a building having a seismic isolation device between a building as a first structure and a building foundation as a second structure, and the fixed cylinder 2 is fixed to the building. On the other hand, the screw rod 3 is fixed to the building foundation via a connecting rod, for example.

  FIG. 2 is a perspective view showing an example of a combination of the nut member 4 and the screw rod 3. The screw rod 3 and the nut member 4 constitute a so-called ball screw device. A commercially available ball screw device can be used. In FIG. 2, a part of the nut member 4 is notched for easy understanding of the internal structure of the ball screw device.

  A spiral ball rolling groove 31 is formed on the outer peripheral surface of the screw rod 3, and the nut member 4 is formed on the screw rod 3 via a large number of balls 6 rolling on the ball rolling groove 31. It is screwed. The nut member 4 has a through hole through which the screw rod 3 passes, and is formed in a substantially cylindrical shape. A spiral shape facing the ball rolling groove 31 of the screw rod 3 is formed on the inner peripheral surface of the through hole. The ball rolling groove 41 is formed. Further, the nut member 4 has an infinite circulation path of the ball 6, and the nut member 4 can move in a spiral manner around the screw rod 3 by the endless circulation of the ball 6. Further, a flange portion 42 is formed on the outer peripheral surface of the nut member 4, and a bolt hole 43 through which a fixing bolt is inserted is provided in the flange portion 42. The nut member 4 is coupled to the rotation suppression mechanism 5 by fastening a fixing bolt.

  In such a ball screw device, one end of the screw rod 3 is fixed to a building foundation as a structure. Therefore, when the screw rod 3 moves in the axial direction along with the vibration of the structure, this translational motion is performed. Is converted into the rotational motion of the nut member 4.

  On the other hand, as shown in FIG. 1, the rotation suppression mechanism 5 includes a pin member 51, a first pin holding portion 52 formed integrally with the fixed cylinder 2, and a second pin holding fixed to the nut member 4. Unit 53. The pin member 51 includes a cylindrical portion 51a and a flange portion 51b formed with a larger diameter than the cylindrical portion 51a. Further, one shear groove 51c is formed on the outer peripheral surface of the cylindrical portion 51a, and the pin member 51 is sheared and broken from the shear groove 51c. Since the shear groove 51c assists the shearing of the pin member 51, it can be omitted if necessary.

  The first pin holding portion 52 is formed at one end of the fixed cylinder 2 and is continuous along the circumferential direction of the fixed cylinder 2 and is formed in a substantially disc shape. The first pin holding portion 52 is formed with one through hole 54 along the axial direction of the screw rod 3, and the pin member 51 is inserted into the through hole 54.

  Further, the second pin holding portion 53 is formed in a substantially disc shape and is fixed to the flange portion 42 of the nut member 4 by a fixing bolt 42a. The second pin holding portion 53 faces the first pin holding portion 52 with a slight gap, and is rotatably supported on the fixed cylinder 2 by a rotary bearing 55. A cross roller bearing is used as the rotary bearing 55 so that the radial load and the thrust load acting on the fixed cylinder 2 from the nut member 4 can be sufficiently supported. Further, an insertion hole 56 is formed in the second pin holding portion 53 at a position facing the through hole 54 of the first pin holding portion 52. The insertion hole 56 penetrates along the axial direction of the screw rod 3 and has the same inner diameter as the through hole 54. In the present embodiment, a cross roller bearing is used as the rotary bearing 55, but other rotary bearings may be used.

  In the rotation restraining mechanism 5 thus formed, the pin member 51 is inserted from the through hole 54 of the first pin holding portion 52 into the insertion hole 56 of the second pin holding portion 53, and these first pin holding portions 52. And it is hold | maintained by the 2nd pin holding | maintenance part 53. FIG. At this time, the flange portion 51 b of the pin member 51 is locked to the axial end surface of the first pin holding portion 52, and the shear groove 51 c of the pin member 51 is a gap between the first pin holding portion 52 and the second pin holding portion 53. It is supposed to be located in.

  In the present embodiment, the first pin holding part 52 is formed integrally with the fixed cylinder 2, but the first pin holding part 52 may be a separate member from the fixed cylinder 2. Furthermore, although the first pin holding portion 52 is a member that is continuous along the circumferential direction of the fixed cylinder 2, it may be provided on a part of the outer peripheral surface of the fixed cylinder 2. Further, the second pin holding portion 53 is formed in a substantially disc shape, but is not formed in a substantially disc shape as long as the pin member 51 can be held between the first pin holding portion 52 and the second pin holding portion 53. There is no problem. Further, the pin member 51 may be inserted from the insertion hole 56 of the second pin holding portion 53.

  The shaking prevention device 1 having the above-described configuration is used with a seismic isolation device arranged between a building and a building foundation. When the screw rod 3 moves in the axial direction along with the vibration of the building, the nut member 4 is moved. Coupled force to rotate with respect to the screw rod 3 acts on the nut member 4. Further, a pin member 51 disposed between a second pin holding portion 53 that is to be rotated together with the nut member 4 and a first pin holding portion 52 formed on the fixed cylinder 2 by a shearing force corresponding to the couple. It comes to act on.

  And in the shake prevention apparatus 1 which concerns on this embodiment, when the wind etc. other than an earthquake act on a building, the rotation motion of the nut member 4 with respect to the screw rod 3 can be controlled by the said rotation suppression mechanism 5, and it is exempted. The building equipped with the seismic device can be prevented from shaking by the wind. On the other hand, when the vibration due to the earthquake acts on the building, the pin member 51 is sheared and broken, and as a result, the seismic isolation device is operated to achieve the seismic isolation of the building.

  In the present embodiment, one through hole 54 and one insertion hole 56 are formed for each of the first pin holding part 52 and the second pin holding part 53. Of these, a plurality of at least one of the holding portions 52 and 53 may be provided along the circumferential direction. With this configuration, when the pin member 51 is inserted into the through hole 54 and the insertion hole 56 again after the earthquake has converged, the amount of movement by which the nut member 4 is rotated so that the through hole 54 and the insertion hole 56 communicate with each other. The amount can be reduced, and the restoration of the shaking prevention device is facilitated accordingly. Further, when the pin member 51 is inserted again, it is only necessary to insert the pin member 51 into the through hole 54 and the insertion hole 56 other than the through hole 54 and the insertion hole 56 where the sheared pin member 51 remains. Therefore, the vibration prevention device can be easily restored.

  In the vibration preventing apparatus 1 according to the present embodiment having the above-described configuration, assuming that the axial force acting on the vibration preventing apparatus 1 is F and the rotational torque transmitted to the nut member 4 is M, these follow the following equations. Relationship. In addition, Ld in the following mathematical formula 1 indicates a lead, which means the distance that the ball rolling groove 31 advances in the axial direction when the screw rod 3 is rotated once.

  That is, in the shake preventing apparatus 1 according to the present embodiment, the rotational torque M is multiplied by 2π / Ld by the ball screw device, and a small couple is converted into a large axial force F. As described above, the shearing force corresponding to the couple acts on the pin member 51. When this shearing force is Ft and the distance from the axial center of the screw rod 3 to the pin member 51 is e, the shearing force Ft is expressed by the following equation in relation to the rotational torque M.

  From the formulas 1 and 2, the relationship between the axial force F and the shear force Ft is expressed by the following formula. In the following description, for convenience, Ld / 2πe in Equation 3 below is referred to as “displacement coefficient α”.

  According to the shake preventing apparatus 1 according to this embodiment, the lead Ld of the ball rolling groove 31 formed on the screw rod 3 and the axis of the screw rod 3 are formed so that the displacement coefficient α is less than 1. By setting the distance e from the pin member 51 to the pin member 51, the shear force Ft acting on the pin member 51 becomes smaller than the axial force F acting on the shake preventing device 1. Therefore, in the shake preventing apparatus 1 according to the present embodiment, even if the pin member 51 itself on which the shearing force Ft acts is small, the building as the first structure is not shaken by winds other than earthquakes. It becomes possible to prevent. In other words, since the diameter of the pin member 51 itself can be reduced, it is suitable for downsizing of the whole anti-shake device compared to the conventional anti-shake device.

  In the shake preventing apparatus 1 according to the present embodiment, the distance e from the lead Ld of the ball rolling groove 31 and the axis of the screw rod 3 to the pin member 51 is within the range where the displacement coefficient α is less than 1. Can be set freely, and is more versatile than conventional anti-shake devices.

  Next, an attenuation device to which the present invention is applied will be described with reference to FIGS.

  Although FIG. 1 shows an example in which the present invention is applied to an anti-sway device, the present invention can also be applied to a rotary inertia mass damper as a damping device that attenuates vibration energy propagating between a building and a building foundation. It is.

  The rotary inertia mass damper 101 according to the present embodiment includes a fixed cylinder 102, a screw rod 103, and a nut member, and these configurations are the same as those of the shake preventing device 1. On the other hand, a rotating cylinder 106 as a rotor formed in a cylindrical shape is coupled to the radially outer side of the nut member. For this reason, in FIG. 3, the nut member is not shown. The rotary cylinder 106 is rotatably supported with respect to the fixed cylinder 102 by a rotary bearing, and rotates with respect to the screw rod 103 together with the nut member. The inner peripheral surface of the rotating cylinder 106 and the outer peripheral surface of the fixed cylinder 102 are opposed to each other, and a cylindrical storage chamber is formed between the rotating cylinder 106 and the fixed cylinder 102. . This storage chamber is filled with a viscous fluid such as silicone oil.

  In addition, the rotary inertia mass damper 101 according to the present embodiment includes a rotation suppression mechanism 105. Since the configuration of the pin member, the first pin holding portion, and the second pin holding portion constituting the rotation suppression mechanism 105 is the same as that of the rotation suppression mechanism 5, the configuration of each member is denoted by the same reference numeral. Description is omitted.

  On the other hand, in the rotation suppression mechanism 105, the first pin holding portion 52 is provided separately from the fixed cylinder 102, and is fixed to the outer peripheral surface of the fixed cylinder 102 by a fixing bolt 52a. The second pin holding portion 53 is fixed to the axial end surface of the rotary cylinder 106 by a fixing bolt 53a. In the rotation suppression mechanism 105, the pin member 51 is inserted from the insertion hole 56 of the second pin holding portion 53 into the through hole 54 of the first pin holding portion 52, and the flange portion 51 b is inserted into the second pin holding portion 53. To be locked.

  In the rotary inertia mass damper 101 configured in this way, the fixed cylinder 102 is fixed to a building as a first structure via a connector 120, while the screw rod 103 has one end via a connector 130. It is fixed to the building foundation as the second structure. As in the case of the anti-swaying device 1, the axial movement of the screw rod 103 is converted into the rotational movement of the nut member and the rotating cylinder 106 by the ball screw device including the screw rod 103 and the nut member. .

  FIG. 5 shows an example in which the rotary inertia mass damper 101 having the above configuration is used for a seismic isolation structure 120 of a building. The seismic isolation structure 120 includes seismic isolation guide means 123 that supports the building 122 movably with respect to the building foundation 121, a rotary inertia mass damper 101 provided between the building foundation 121 and the building 122, an earthquake Recovery means 124 for returning the building 122 to a predetermined position on the building foundation 121 after the convergence. The seismic isolation guide means 123 prevents the shaking of the building foundation 121 due to the earthquake from directly propagating to the building 122, and allows the building 122 to move freely on the building foundation 121. And a linear guide that combines a slider that moves along with this, and a structure in which a steel ball freely rolls between a pair of foundations are known. Further, the recovery means 124 moves the building 122 to a predetermined position on the building foundation 121 in order to prevent the displacement of the building 122 supported by the seismic isolation guide means 123 from remaining after the earthquake has converged. For example, a laminated rubber formed by stacking rubber plates in multiple layers is used.

  In the seismic isolation structure 120, when vibration due to the earthquake propagates from the building foundation 121 to the building 122, vibration along the axial direction of the screw rod 103 acts between the fixed cylinder 102 and the screw rod 103. The axial force of the screw rod 103 is converted into a couple force that tries to rotate the nut member and the rotating cylinder 106 by the ball screw device, and a shearing force corresponding to the couple force acts on the pin member 51. .

  When the pin member 51 is sheared and broken by the shearing force, the nut member screwed into the screw rod 103 can rotate around the screw rod 103 while being repeatedly inverted. Along with this, the rotating cylinder 106 rotates around the fixed cylinder 102. Thus, the axial motion of the screw rod 103 is converted into the rotational motion of the rotating cylinder 106, so that the inertial mass effect generated by the rotating motion of the rotating cylinder 106 acts as a reaction force, and the building 122 and the building Vibrations propagating to the foundation 121 are reduced, so that damage to the building 122 and excessive deformation of the seismic isolation layer can be reduced. At the same time, when the rotating cylinder 106 rotates, the viscous fluid sealed in the accommodation chamber applies a viscous force in a direction opposite to the rotating direction of the rotating cylinder 106 and propagates between the building 122 and the building foundation 121. The vibration energy to be absorbed can be absorbed.

  According to the rotary inertia mass damper 101 using the ball screw device according to the present embodiment, the screw rod 103 is arranged so that the displacement coefficient α is less than 1, as in the shake preventing device 1 according to the first embodiment. By setting the distance e from the lead Ld of the formed ball rolling groove and the axis of the screw rod 103 to the pin member 51, the shear force Ft acting on the pin member 51 acts on the rotary inertia mass damper 101. It becomes possible to make it smaller than the axial force F. For this reason, the pin member 51 itself that loads this shearing force, and thus the rotation suppression mechanism 105 can be reduced in size. Since the rotation suppression mechanism 105 can be reduced in size as described above, the rotation suppression mechanism 105 can be easily attached to a conventional rotary inertia mass damper using a ball screw device using a general-purpose product such as a fixing bolt. Therefore, it is possible to easily provide a function as an anti-swing device to the conventional rotary inertia mass damper.

  For this reason, it is not necessary to install a shake prevention device separately from the rotary inertia mass damper 101 between the building 122 and the building foundation 121. Therefore, conventionally, the rotary inertia mass damper 101 as the damping device and two anchor members for installing the shake prevention device are required, whereas the rotary inertia mass damper 101 to which the present invention is applied has the shake prevention device. Therefore, it is only necessary to prepare one anchor member for installing the rotary inertia mass damper 101.

  The embodiment shown in FIG. 4 is an application of the present invention to a rotary inertia mass damper having a viscous fluid working chamber. However, the present invention is a rotary inertia mass damper using a ball screw device. It is also possible to apply to the one having no working chamber. The present invention can also be applied to a viscous damping device using a ball screw device.

  In addition, in the rotation suppression mechanism with which the anti-swing device shown in FIGS. 1 and 4 is provided, the pin member is sheared and destroyed when a horizontal external force larger than a predetermined value acts on the building. The structure of the mechanism is not limited to this. As another configuration of this rotation suppression mechanism, for example, the pin member is biased toward the first pin holding portion or the second pin holding portion with an elastic member or the like, and a shearing force larger than a predetermined value acts on the pin member. In this case, the rotation restraining mechanism may be released by the pin member moving forward and backward against the urging force of the elastic member or the like. According to this embodiment, since the pin member is not sheared and broken, it is not necessary to prepare a new pin member, and an increase in cost can be prevented.

DESCRIPTION OF SYMBOLS 1 ... Shake prevention apparatus, 2 ... Fixed cylinder, 3 ... Screw rod, 4 ... Nut member (rotor), 5 ... Rotation suppression mechanism, 51 ... Pin member, 52 ... 1st pin holding part, 53 ... 2nd pin holding part

Claims (3)

An anti-swing device that is disposed between a first structure and a second structure and is used with a seismic isolation device that prevents vibration from directly propagating from one structure to the other. And
A fixed cylinder coupled to the first structure, a screw rod having one end coupled to the second structure and moving forward and backward in the axial direction and having a helical thread groove formed on the outer peripheral surface, and the screw rod While comprising a ball screw device, a rotor rotatably supported with respect to the fixed cylinder, and a rotation suppression mechanism provided between the fixed cylinder and the rotor,
The rotation suppression mechanism includes a pin member, a through hole into which the pin member is inserted, a first pin holding portion provided in the fixed cylinder, and an insertion hole facing the through hole of the first pin holding portion. And a second pin holding portion provided on the rotor. A damping device disposed between a first structure and a second structure and used with a seismic isolation device that prevents vibration from propagating directly from one structure to the other. ,
A fixed cylinder coupled to the first structure, a screw rod having one end coupled to the second structure and moving forward and backward in the axial direction, and having a helical thread groove formed on the outer peripheral surface; A nut member formed in a cylindrical shape together with the ball screw device, a rotor as a rotary inertia mass provided on the radially outer side of the nut member and rotatably supported with respect to the fixed cylinder; A rotation suppression mechanism provided between the fixed cylinder and the rotor,
The rotation suppression mechanism includes a pin member, a through hole into which the pin member is inserted, a first pin holding portion provided in the fixed cylinder, and an insertion hole facing the through hole of the first pin holding portion. And a second pin holding portion provided on the rotor. The damping device according to claim 2, wherein a storage chamber formed in a cylindrical shape is provided between the rotor and the fixed cylinder, and viscous fluid is sealed in the storage chamber.

Images