JP4702658B2 - Seismic isolated building position restoration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to a base-isolated building in which the upper structure is supported so as to be horizontally displaceable with respect to the lower structure, and the upper structure is displaced with respect to the lower structure due to an earthquake or a wind. The present invention relates to a position restoring device for restoring an upper structure to a predetermined position when it remains.
[0002]
[Prior art]
As is well known, the upper structure is supported from the lower structure via the seismic isolation device, so that the upper structure is supported even in strong winds such as typhoons in the seismic isolation building where the upper structure is supported horizontally. The body may move horizontally, which may lead to a decrease in comfort. Measures against this problem include (1) increasing the operation input of the seismic isolation device so that the seismic isolation device does not operate due to strong winds, or (2) providing a trigger that operates with a certain earthquake input. Has been taken.
[0003]
[Problems to be solved by the invention]
Here, when the measure (1) is adopted, the seismic isolation device does not operate in a small and medium-sized earthquake, and the function as a seismic isolation building is degraded. In addition, when the measure (2) is adopted, the reliability of the trigger becomes a problem, and as in the case of (1), the seismic isolation device does not operate in small and medium-sized earthquakes. There is concern about the decline in functionality.
[0004]
In addition, if a seismic isolation device that does not have a restoring force such as a sliding bearing is used, residual deformation occurs due to horizontal movement of the upper structure relative to the lower structure. It was also desired to restore the deformation.
[0005]
The present invention has been made in view of such circumstances, and even when a sliding bearing or the like is adopted in a base-isolated building, there is no concern about the wind pressure movement of the superstructure due to strong winds, and the base is also operated even in small and medium earthquakes. It is an object to provide a technology capable of adopting a seismic device.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 is applied to a base-isolated building in which the upper structure is supported so as to be horizontally displaceable with respect to the lower structure, and the upper structure is separated from the lower structure by an earthquake or wind. A device for restoring the upper structure to a predetermined position after the displacement remains, the winding means rotatably attached to the lower structure, and the winding Drive means for rotating the means, and three or more string-like bodies, one end of which is fixed to the winding means so as to be able to be wound, and the other end is attached to each of the different positions in the upper structure. The region including at least the attachment position of the string-like body in the upper structure is formed rigidly, and each string-like body is arranged in a direction that balances the tension when they are simultaneously tensioned. Iko It is characterized in.
[0007]
With such a configuration, each string-like body is wound to have a predetermined length, and by being tensioned, the relative position in the translational direction of the upper structure relative to the winding means can be determined. Further, by winding the string-like body into a tension state and maintaining this state, it is possible to prevent the movement of the upper structure during a strong wind.
[0008]
A plurality of string-like bodies are attached to the same winding means, and the length of the string-like bodies is the same as that of the winding means when the upper structure is in the predetermined position. It is characterized in that it is set with an extra length of the same dimension with respect to the distance dimension between the attachment position of the other end of each string-like body.
[0009]
With such a configuration, each string-like body can be put in a tensioned state by winding each string-like body for the extra length by the same winding means.
[0010]
Further, the winding means is formed by a steel pipe that is installed in an upright state on the lower structure and is rotatably attached around its axis, and each of the string-like bodies is respectively provided with respect to the steel pipe. It is characterized by being fixed at different height positions.
[0011]
With such a configuration, the winding means can be realized with a simple structure.
Furthermore, the invention according to claim 1 is provided with a driving force transmission mechanism that transmits the rotational force of the driving means to the winding means, and the driving force transmission mechanism includes the string-like body formed by the winding means. A detecting means for detecting a winding length is provided, and the detecting means comprises a first sensor and a second sensor for detecting whether the string-like body is loose or tensioned.
With such a configuration, the first sensor and the second sensor can detect whether the string-like body is slack or tension.
[0012]
The invention according to claim 2 is the position restoring device for a base-isolated building according to claim 1 , further comprising a control device for controlling the operation of the driving means, and the control device has the string-like body after the earthquake. A post-earthquake switch for restoring the upper structure displaced by the earthquake by driving the driving means so as to wind up to the maximum position, and winding up the string-like body at the time of strong wind such as a typhoon. And a typhoon switch for driving the driving means to fix the upper structure in a predetermined position, and the control device turns on the post-earthquake switch to place the upper structure in a predetermined position. After the restoration, the drive means is operated so as to maintain the relaxed state of the string-like body, and after the typhoon switch is turned on to fix the upper structure in a predetermined position, The winding means is the string When the detecting means detects that the body has been rotated in the direction opposite to the direction of winding the body, the driving means is operated again so that the string-like body is wound to the maximum extent. It is said.
[0013]
With such a configuration, even if the upper structure moves in a strong wind, the position can always be restored.
[0014]
Further, the invention according to claim 3 is the position restoring device for the seismic isolation building according to claim 2, wherein the control device includes the string-like body after a predetermined time has elapsed since the typhoon switch was turned on. A timer for operating the driving means so as to loosen, and a forced always-on switch for operating the driving means so as to loosen the string-like body in preference to the timer.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 are diagrams schematically showing an operation unit 1a of a position restoring device 1 according to an embodiment of the present invention. FIG. 1 is an elevation view thereof, and FIG. It is.
[0016]
This position restoration apparatus 1 is installed for a seismic isolation house (base isolation building) 2 having a wooden house having a planar shape as shown in FIG. In the seismic isolation house 2, a base isolation device 4 is disposed on a base (lower structure) 3, and a connecting member 5 is disposed on the base isolation device 4 so as to connect the base isolation devices 4 to each other. At the same time, the connecting members 5 are assembled in a plane to form a rigid frame 6. And the upper structure 7 as a living part of the seismic isolation house 2 is constructed on the rigid frame 6 so that the entire upper structure 7 is supported by the seismic isolation devices 4.
[0017]
Here, as shown in FIG. 5, the seismic isolation device 4 has a rectangular support plate 10 mounted on the base 3 and a bolt on the lower surface of the connecting member (not shown here) on the upper structure 7 side. 11, and the caster 12 rolls on the upper surface of the support plate 10 while supporting the upper structure 7, thereby allowing the horizontal displacement of the upper structure 7 with respect to the base 3. It functions as follows. A mounting plate 13 made of a circular flat plate steel plate is attached around the caster 12 by a bolt 11, and a viscoelastic body is formed between the mounting plate 13 and the outer peripheral edge of the support plate 10. An annular spring member 14 is adhered and attached to both sides. Reference numeral 15 denotes a number of bearing balls for adjusting the rolling resistance of the caster 12, and reference numeral 16 denotes a bellows-like cover mounted on the outside of the spring member 14.
[0018]
Such a seismic isolation device 4 can obtain a vertical support force by the casters 12 and a restoring effect with respect to the horizontal displacement of the upper structure 7 by the elastic restoring force of the spring member 14. By forming the concave portion 17 in the central portion of 10, a restoring force can be obtained by returning the caster 12 to the concave portion 17 after horizontal displacement has occurred. Furthermore, by setting the coefficient of friction between the caster 12 and the support plate 10 to be moderate (for example, about 3 to 10%), not only a damping effect due to the friction force between them can be obtained, but also the spring member 14. The damping effect by the energy absorption effect due to the shear deformation can be expected.
[0019]
On the other hand, when the horizontal force that exceeds the sum of the restoring forces of all seismic isolation devices 4 installed in the seismic isolation device 2 acts on the seismic isolation home 2 due to an earthquake or strong wind, It is provided to prevent the structure 7 from moving and remaining deformed. As shown in FIG. 4, the operation unit 1 a is installed in, for example, two places in the seismic isolation house 2.
[0020]
As shown in FIGS. 1 and 2, the operation unit 1 a includes a support base 20 fixed on a base 3 (not shown here), and stands on the support base 20 and rotates around its axis. A steel pipe (winding means) 21 made possible, a motor (driving means) 22 fixed on the support 20, and a driving force transmission mechanism 23 for transmitting the rotational force of the motor 22 to the steel pipe 21 are provided. ing.
[0021]
The driving force transmission mechanism 23 is a combination of a plurality of gears 24, and applies a strong rotational force to the steel pipe 21 by decelerating the rotation of the motor 22 and, for example, increasing it by about 1000 times. Be able to. Each gear 24 is made of polytetrafluoroethylene, a bearing, silicon oil, grease, or the like for reducing friction.
[0022]
Further, one end 25a of the four wire ropes 25 is fixed to the outer peripheral surface of the steel pipe 21 by welding or the like at different height positions. These wire ropes 25 are both arranged in the horizontal direction, but as shown in FIGS. 2 and 4, they are arranged in different directions as viewed from the steel pipe 21 side in a plan view. Thereby, when the wire rope 25 is simultaneously tensioned, the tension is balanced with each other. As shown in FIG. 4, the wire rope 25 has the other end 25 b fixed to the rigid frame 6 at different positions. These wire ropes 25 are rust-proofed.
[0023]
As described above, the plurality of wire ropes 25 attached to the same steel pipe 21 can simultaneously wind up one end 25a by the steel pipe 21 with the same size by rotating the steel pipe 21 in a predetermined direction. ing. Each wire rope 25 has a length dimension from the steel pipe 21 to the attachment position of the other end 25b when the upper structure 7 is in its original position (when not displaced by an earthquake or strong wind). Are set with an extra length of the same dimension. Therefore, by winding each wire rope 25 attached to the same steel pipe 21 by the steel pipe 21 by the extra length at the same time, these wire ropes 25 can be simultaneously in a tension state. In this case, the upper structure 7 is restored to a predetermined position.
[0024]
As shown in FIG. 2, a turnbuckle 26 is interposed in the middle of the wire rope 25. Thereby, the length dimension of the wire rope 25 can be finely adjusted, and these can be made into a tension | tensile_strength state reliably simultaneously.
[0025]
Further, as shown in FIG. 1, the final gear 24A (the gear 24 attached to the outer periphery of the steel pipe 21) in the driving force transmission mechanism 23 has a first sensor 27 and a second sensor formed as counter-type limiters. A sensor 28 is attached. The first sensor 27 and the second sensor 28 detect the winding length of the wire rope 25. The rotation angle of the final gear 24A when the wire rope 25 is completely slackened is 0 °, When the rotation angle of the final gear 24A when the wire rope 25 is wound up to the maximum is 160 °, the first sensor 27 is at the 2 ° position and the second sensor 28 is at the 158 ° position. It can be detected. Thereby, the first sensor 27 and the second sensor 28 can detect whether the wire rope 25 is slack or tensioned.
[0026]
Further, as shown in FIG. 1, the first sensor 27 and the second sensor 28 can output the detection result to a control device 29 for controlling the rotation operation of the motor 22. It has become. The control device 29 includes a typhoon switch 30 for starting the operation of the position restoration device 1 in a strong wind such as a typhoon, and a post-earthquake switch 31 for starting the operation of the position restoration device 1 after an earthquake. The procedure of the control device 28 started by the typhoon switch 30 is canceled, and a forced always-on switch 32 that puts the position restoring device 1 in the same state as normal is connected. The control device 29 has a built-in timer 34 that operates after a predetermined time (for example, 24 hours) has elapsed since the typhoon switch 30 is turned on.
[0027]
Next, the operation procedure of the position restoring device 1, that is, the control procedure of the motor 22 by the control device 29 is shown in FIG. The control device 29 basically sets the rotation position of the steel pipe 21 to the release position, that is, the position where the wire rope 25 is completely slackened (step S1). The control device 29 repeats the procedure for detecting ON / OFF of the typhoon switch 30 (step S2) and the procedure for detecting ON / OFF of the post-earthquake switch 31 (step S3).
[0028]
When a strong wind is generated by a typhoon or the like, for example, a resident of the seismic isolation house 2 turns on the typhoon switch 30. Thereby, the control apparatus 29 judges that the switch 30 at the time of a typhoon is ON in step S2, and performs the process of step S4.
[0029]
In step S <b> 4, the control device 29 rotates the steel pipe 21 so that the motor 22 is rotated forward and the wire rope 25 is wound around the steel pipe 21. In this state, it is determined whether or not a detection result indicating that the rotational position of the final gear 24A is 158 ° is output from the second sensor 28 (step S5), and it is determined that this detection result is not output. If so, the process returns to step S4 again to continue the rotation of the motor 22 (winding of the wire rope 25). In step S5, when it is determined that the rotational position of the final gear 24A is 158 ° based on the output of the second sensor 28, the motor 22 is stopped after 10 seconds (step S6). . In this case, the rotation angle of the final gear 24A is 160 °, and the wire rope 25 is wound up to the maximum extent by the steel pipe 21 to be in a tension state, and the tension between the wire ropes 25 is balanced, thereby providing seismic isolation. The relative position of the translation direction with respect to each steel pipe 21 of the upper structure 7 of the house 2 is determined. At this time, since the operation part 1a of the position restoration device 1, that is, two steel pipes 21 are installed in the seismic isolation house 2, the relative position in the rotation direction of the upper structure 7 with respect to the steel pipes 21 is also determined simultaneously. Therefore, the position of the upper structure 7 is set to a predetermined position.
[0030]
Furthermore, if the upper structure 7 is displaced from this state by the strong wind, the rotation angle of the final gear 24A passes through 158 ° by the second sensor 28 in the reverse direction (the direction opposite to the winding direction of the wire rope 25). It is expected that a detection result will be obtained. Therefore, the control device 29 refers to the output from the second sensor 28 to determine whether or not the final gear 24A has passed through 158 ° in reverse (step S7). Returns to step S4 again and continues the processing below it. That is, the wire rope 25 is wound up to the maximum and the position of the upper structure 7 is set to a predetermined position.
[0031]
On the other hand, in step S7, when the detection result that the final gear has passed through 158 ° by reverse rotation is not obtained from the second sensor 28, the control device 29 turns on the typhoon switch 30. It is determined with reference to the timer 34 whether or not 24 hours have passed since the start (step S8). Then, when it is determined that 24 hours have elapsed, the processes in and after step S10 are performed as described later. When it is determined that 24 hours have not elapsed, the control device 29 next determines whether the forced constant switch 32 is ON / OFF (step S9). In this case, if it is determined that the forced always-on switch 32 is ON, the processing in and after step S10 is performed as described later, similarly to the case where it is determined in step S8 that 24 hours have elapsed. If it is determined that the forced always-on switch 32 is OFF, the processing from step S7 is continued again.
[0032]
If 24 hours have passed since the typhoon switch 30 was turned on, or if the forced always-on switch 32 was turned on even before 24 hours, the motor 22 is reversed in step S10, thereby The steel pipe 21 is rotated in the direction in which the rope 25 is relaxed. Then, based on the output result from the first sensor 27, it is determined whether or not the final gear has passed through the 2 ° position in reverse (step S11), and the output result from the first sensor 27 is not obtained. In step S10, the motor 22 continues to reverse.
[0033]
On the other hand, when it is determined in step S11 that the final gear has passed through the position of 2 ° in reverse, the motor 22 is stopped 10 seconds later (step S12). Thereby, the state in which the wire rope 25 is completely loosened, that is, the constantly released position in step S1 is set.
[0034]
The above is the procedure related to the operation control of the position restoration device 1 during a typhoon. If the upper structure 7 is displaced relative to the base 3 in the horizontal direction during an earthquake, the resident of the seismic isolation house 2 Etc. turn on the post-earthquake switch 31 to determine that the post-earthquake switch 31 is on in step S3. In this case, the control device 29 rotates the motor 22 in the forward direction so that the wire rope 25 is wound up by the steel pipe 21 (step S13), and further, referring to the output from the second sensor 28, the final gear It is determined whether or not 24A has passed the position of 158 ° (step S14). When the output from the second sensor 28 cannot be obtained, the winding of the wire rope 25 has not been completed yet, so the process returns to step S13 again to rotate the motor 22 forward (winding of the wire rope 21). continue. On the other hand, when it is determined in step S14 that the output from the second sensor 28 is obtained and the final gear 24A has passed the position of 158 °, the control device 29 turns off the motor 22 after 10 seconds. Stop (step S15). At this time, the rotation angle of the final gear 24A becomes 160 °, and the wire rope 21 is wound up to the maximum to be in a tension state, and the position of the upper structure 7 is restored as described above. .
[0035]
After that, the control device 29 shifts to the steps after step S10, reverses the motor 22, and relaxes the wire rope 25 (steps S10, 11, 12). As a result, the position restoring device is set to the constantly released position in step S1.
[0036]
The position restoring device 1 described above is fixed so that the steel pipe 21 rotatably attached to the base 3, the motor 22 for rotating the steel pipe 21, and one end 25 a can be wound around the steel pipe 21, The other end 25b includes four wire ropes 25 attached to different positions of the rigid frame 6 that supports the upper structure 7, and when the wire ropes 25 are simultaneously tensioned, the tension force Are arranged in such a direction as to balance each other. Therefore, the relative position in the translational direction of the upper structure 7 with respect to the steel pipe 21 can be determined by winding the wire rope 25 to a predetermined length by the steel pipe 21 and tensioning the wire rope 25. Thereby, the position of the upper structure 7 moved by an earthquake or the like can be reliably restored to the original position. In addition, when the wind is strong, the position of the upper structure 7 can be fixed by winding the wire rope 25 to be in a tension state. By maintaining this state, the movement of the upper structure 7 during the strong wind is possible. Can be blocked. Therefore, unlike conventional ones, it is not necessary to increase the operation input of the seismic isolation device in order to prevent displacement of the upper structure 7 due to small and medium earthquakes, strong winds, etc., and to realize a highly sensitive seismic isolation house 2. it can.
[0037]
Moreover, in the above-mentioned position restoration apparatus 1, when the several wire rope 25 is attached with respect to the same steel pipe 21, the length dimension of these wire ropes 25 has the upper structure 7 in an original position. With respect to the distance dimension between the attachment position of the other end 25b and the steel pipe 21 (when not displaced by an earthquake or a strong wind), they are set with an extra length corresponding to the same dimension. Thereby, the wire rope 25 can be simultaneously wound up by the length of the extra length by the same steel pipe 21, thereby making each wire rope 25 into a tension state at the same time and reliably preventing the displacement of the upper structure 7 in a strong wind. be able to.
[0038]
Further, as the winding means of the wire rope 25, the steel pipe 21 installed upright on the base 3 is used, and the wire ropes 25 are fixed to the steel pipe 21 at different height positions. Therefore, the structure which can wind up each wire rope 25 simultaneously is easily realizable. Further, the wire rope 25 can be firmly joined to the steel pipe by welding or the like.
[0039]
Further, in the above-described position restoring device 1, the control device 29 for controlling the operation of the motor 22 and the first and second sensors 27 for detecting the rotation angle of the final gear 24A (the rotation angle of the steel pipe). , 28, and the control device 29 determines whether or not it is a strong wind based on ON / OFF of the typhoon switch 30, and when the strong wind is determined, When the motor 22 is operated so that the rope 25 is completely wound, and the output from the second sensor 28 detects that the final gear 24A has rotated in the direction opposite to the direction in which the wire rope 25 is wound. In this case, the motor 22 is operated again so that the wire rope 25 is wound up to the maximum extent. Thereby, even if the upper structure 7 moves during a strong wind, the position can be restored each time, and the comfortability of the seismic isolation house 2 during the strong wind can be improved.
[0040]
Further, in the base-isolated house 2 provided with the position restoration device 1 as described above, the base-isolation device 4 that operates even from a small and medium-sized earthquake can be employed without worrying about wind pressure movement due to strong winds, and residual after the earthquake. Deformation can be eliminated, an excellent seismic isolation function can be realized, and maintenance after an earthquake becomes easy.
[0041]
In the above-described position restoring device 1, since the steel pipe 21 is provided at two or more locations, the relative position in the rotational direction of the upper structure 7 with respect to the steel pipe 21 is determined. The position 7 can be restored to the original position. However, in the said embodiment, it is good also considering the position of the steel pipe 21 as one place. In this case, it is desirable to provide a stopper or the like between the base 3 and the upper structure 7, thereby restricting the rotational displacement of the upper structure 7.
Moreover, in the said embodiment, it may replace with a wire rope and may be made to use a chain, a nylon rope, etc.
[0042]
【The invention's effect】
According to the position restoration device described above, the position of the upper structure can be maintained during strong winds, so there is no concern of wind pressure movement due to strong winds in the upper structure of the base isolation building, and the residence of the base isolation building during strong wind Can be improved. Moreover, unlike conventional models, there is no need to increase the operation input of the seismic isolation device in order to prevent displacement of the superstructure due to small and medium earthquakes, strong winds, etc. can do.
Similarly, in a base-isolated building to which such a position restoration device is applied, it is possible to adopt a base-isolation device that operates even from a small and medium earthquake without worrying about the wind pressure movement of the superstructure due to strong winds. Residual deformation can be eliminated, an excellent seismic isolation function can be realized, and maintenance after an earthquake can be facilitated.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating an embodiment of the present invention, and is an elevational cross-sectional view of an operation unit of a position restoring device.
FIG. 2 is a plan view of the same.
FIG. 3 is a flowchart showing a motor control procedure by the control device of the position restoring device shown in FIGS.
4 is a plan view of a base-isolated house to which the position restoring device shown in FIGS. 1 and 2 is applied. FIG.
5 is a perspective sectional view of a seismic isolation device applied to the seismic isolation house shown in FIG. 4. FIG.
[Explanation of symbols]
1 position restoration device 2 base-isolated house (base-isolated building)
3 foundation (substructure)
4 Seismic isolation device 6 Rigid frame 7 Superstructure 21 Steel pipe (winding means)
22 Motor (drive means)
23 Driving force transmission mechanism 25 Wire rope (string-like body)
27 First sensor (detection means)
28 Second sensor (detection means)
29 Controller
30 Typhoon switch
31 Post-earthquake switch
32 Forced always-on switch
34 timer

Claims (3)

After the upper structure is applied to a base-isolated building supported so as to be horizontally displaceable with respect to the lower structure, the upper structure is displaced relative to the lower structure by an earthquake or wind, and this displacement remains. , An apparatus for restoring the upper structure to a predetermined position,
Winding means attached rotatably to the lower structure, drive means for rotating the winding means, one end fixed to the winding means so as to be able to wind, and the other end Comprising three or more string-like bodies attached to different positions in the upper structure,
A region including at least the attachment position of the string-like body in the upper structure is formed rigidly,
Each string-like body is arranged in such a direction that, when simultaneously tensioned, the tension is balanced with each other ,
A plurality of string-like bodies are attached to the same winding means,
These string-like bodies have a length dimension relative to a distance dimension between the winding means and the attachment position of the other end of each string-like body when the upper structure is in the predetermined position. It is set with an extra length of the same dimension ,
The winding means is formed by a steel pipe that is installed in an upright state on the lower structure and is rotatably attached around its axis, and each string-like body has a height different from that of the steel pipe. Fixed at the position ,
A driving force transmission mechanism that transmits the rotational force of the driving unit to the winding unit is provided, and the driving force transmission mechanism includes a detecting unit that detects a winding length of the string-like body by the winding unit. The seismic-isolated building position restoring apparatus, comprising: a first sensor that detects whether the string-like body is slack or tensioned, and a second sensor . A position restoring device for a base-isolated building according to claim 1 ,
A control device for controlling the operation of the drive means, wherein the control device drives the drive means so as to wind up the string-like body to the maximum extent after the earthquake and sets the upper structure displaced by the earthquake in a predetermined manner; A post-earthquake switch for restoring the position, and a typhoon switch for driving the drive means so as to wind up the string-like body to the maximum in a strong wind such as a typhoon to fix the upper structure in a predetermined position; With
In addition, after the switch is turned on after the earthquake and the upper structure is restored to a predetermined position, the control device operates the driving means so as to maintain the loosened string-like body. ,
When the detecting means detects that the winding means has rotated in the direction opposite to the winding direction of the string-like body after the typhoon switch is turned on and the upper structure is fixed at a predetermined position. In another aspect of the present invention, the drive means is operated so that the string-like body is wound up to the maximum extent. A position restoring device for a seismic isolation building according to claim 2,
  The control device includes a timer for operating the driving means to loosen the string-like body after a predetermined time has elapsed since the typhoon switch is turned on, and to loosen the string-like body in preference to the timer. A position restoring device for a base-isolated building comprising a forced always-on switch for operating the driving means.

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