JP2003278827A - Damper for tower like structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make the movement of a weight unrestricted and the entire body of a device compact even when a spring constant or a length of a natural period adjusting spring is changed. <P>SOLUTION: A floor frame 5 horizontally protrudes outside a part near the upper end part of a tower like structure. On the floor frame 5, the weight 8 is mounted so as to be horizontally movable. A support base 10 is provided in the lower part of the floor frame 5. The natural frequency adjusting spring 11 is attached between the support base 10 and the weight 8 so as to vertically expand. When the weight 8 moves horizontally, the spring 11 exerts a horizontal component on the weight 8 when the spring 11 is slantwise expanded and restored. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel tower having a chimney or a truss structure, or a so-called tower-like structure having a columnar shape, a prismatic shape, a conical shape, a pyramidal shape, etc., which is long in the vertical direction, and is shaken by wind load or earthquake The present invention relates to a vibration damping device used to reduce (vibration).

[0002]

2. Description of the Related Art As a conventional vibration damping device used for this kind of tower-shaped structure, for example, for a chimney, a chimney a is shown in FIG. The suspension base b is attached to the top of the base so that it extends in the front-rear and left-right directions in the shape of an arm, and at the lower position of the suspension base b, it surrounds the chimney a with a required space as a vibration-damping body. An annular weight c is arranged, and the weight c
Is suspended and supported on the suspension base b by a rope d, and a damper e is interposed between the inner peripheral surface of the annular weight c and the outer peripheral surface of the chimney a in the front-rear and left-right directions. When the chimney a sways, the sway of the sway b
Is transmitted to the weight c via the rope d in a phase delay of 90 ° so that the kinetic energy of the weight c at that time is attenuated by the damper e, or FIG. 14 shows another example. As shown schematically, a base frame f is provided horizontally on the outer surface near the upper end of the chimney a so that the chimney a mainly sways, and a block-shaped weight g is provided on the base frame f. Through wheel h to chimney a
Is movably mounted in the swinging direction, and the weight g and the chimney a
The damper e and the natural period adjusting spring i are installed horizontally between the outer surface of the chimney a and the chimney a.
There is a damper in which the kinetic energy of the weight g when the sway of the weight is transmitted to the weight g on the base frame f with a delay phase of 90 ° is attenuated by a damper e. In order to give the optimal damping effect to the chimney a which is a structure, it is necessary to match the natural period of the chimney a with the natural period of the weights c and g which are the vibration suppressors.

[0003]

However, in the case of the vibration damping device shown in FIG. 13, the length of the rope d must be changed in order to adjust the natural period of the weight c. There is a problem that a great amount of labor is required to change the height, and when the natural period of a long tower-like structure such as the chimney a is long, the length of the rope d is also long, and the size of the entire device is large. There is.

On the other hand, in the case of the vibration damping device shown in FIG. 14, it is necessary to adjust the spring constant of the spring i. However, if the spring constant is changed, the expansion / contraction stroke of the spring i changes, and thus the spring i. If the expansion / contraction stroke of is changed, the movement of the weight g is restricted, and the damping effect is reduced.
Further, if the expansion / contraction stroke of the spring g is set to a certain length, the total length of the spring g is usually required to be 5 times as large as the expansion / contraction stroke. is there.

In view of this, the present invention makes it possible to reduce the size of the entire tower-shaped structure vibration damping device in which a spring is used to adjust the natural period, and the spring constant and Even if the length of the spring is changed, the movement of the vibration control body is not restricted.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention supports a damping body in the vicinity of the upper end of a tower structure so as to be movable in the horizontal direction, and the damping body and the tower. The natural period adjusting springs arranged in the up-down direction are interposed between the structure-like structure side and the vertical structure side.

If the natural period adjusting springs are arranged in the vertical direction, even if the damping body moves, the amount of expansion of the spring is small, so that there is no restriction on the movement of the damping body. By changing the spring constant and the length of the spring, the natural period of the vibration damper can be easily adjusted.

Further, a floor frame is provided on an outer surface portion near the upper end of the tower-like structure, and a damping body is mounted on the floor frame so as to be movable in the horizontal direction, and below or below the damping body. A support base was attached to the outer surface of the tower-shaped structure so as to be located above, and a natural period adjusting spring was attached between the support base and the vibration damping body so that an elastic force acts in the vertical direction. With the configuration, the entire device can be made compact and unitized.

Further, when the natural period adjusting spring is a tension spring, pretension is applied, while
When a compression spring is used, the natural period can be initialized by applying precompression.

Furthermore, an active type can be obtained by providing an actuator for reciprocating the vibration damping body in the horizontal direction.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, basically, a vibration damping body is movably supported in a horizontal direction on a side portion near the upper end of the tower-shaped structure, and the vibration damping body and the tower-shaped structure are fixed to each other. A natural period adjusting spring arranged in the up-down direction is interposed between the structure and the section, and the vibration of the tower-shaped structure is suppressed by the vibration control body moving with respect to the vibration of the tower-shaped structure.

1 (a), (b) and (c) show a concrete structure of an example thereof, and a tower structure damping device I of the present invention is shown.
Shows a case where the above is configured as a passive type, and a case where the chimney 1 is taken as an example of the tower-like structure. A vertically long base plate 2 is arranged on one side of the outer surface portion near the upper end of the chimney 1 in the left-right direction, and the base plate 2 is attached to a bracket 3 fixed to the chimney 1 with bolts 4, and the base plate 2 is vertically moved. The floor frame 5 is fixed to the middle step portion by welding or the like so as to horizontally project in the horizontal direction, and the support base 10 is projecting downward from the floor frame 5 at the lower end portion of the base plate 2. On the floor frame 5, guide rails 6 extending in the laterally extending direction are laid in parallel on the front and rear sides of the floor frame 5, and a block-shaped weight serving as a vibration damper is provided on the guide rails 6. 8 is mounted movably in the left-right direction via wheels 9, and in the center portion of the floor frame 5 in the front-rear direction,
A long hole 7 extending in a required length in the left-right direction is provided, and a natural period adjusting spring 11 which is a so-called tension coil spring is provided through the long hole 7 and a central portion of the lower surface of the weight 8 and an upper surface of the support base 10. It is installed vertically so that the expansion and contraction force (spring force) acts in the up and down direction. Further, a damper 12 is installed between the base plate 2 and an end surface of the weight 8 on the side of the base plate 2, and a cover casing is provided so as to surround a space area on the floor frame 5 having the weight 8 and the damper 12. 13 is provided.

The upper and lower ends of the natural period adjusting spring 11 are fixed on the bracket 14 fixed to the center of the lower surface of the weight 8 and the support base 10, as shown in an enlarged view in FIG. It is attached to the bracket 15 via the link members 16 and 17, respectively.
A plurality of pin holes 18 are provided in advance in the vertical direction at a required pitch, and the upper end portion of the link member 16 is connected to any one of the pin holes 18 by inserting a fixing pin 19, while the bracket 15 is attached to the bracket 15. Can change the spring constant of the spring 11 by pivotally attaching the lower end of the link member 17 to the left and right by a pin 20 and selecting the insertion position of the fixing pin 19 into the pin hole 18. I am doing it.

As described above, when the vibration damping device I is installed near the upper end of the chimney 1, an initial tension (pretension) is applied to the spring 11 so that the natural period of the weight 8 matches the natural period of the chimney 1. To In this case, the fixed position of the link member 16 in which the upper end of the spring 11 is locked is arranged in the vertical direction of the bracket 14 and any pin hole 1 is provided.
By selecting 8 and inserting the fixing pin 19, the spring constant and the expansion / contraction stroke of the spring 11 are set to desired values.

In the above state, when the chimney 1 sways due to aerodynamic force or the like, the swaying energy is transmitted to the weight 8, so that the weight 8 is converted into kinetic energy for moving in the left-right direction, and the energy is converted. The sway of the chimney 1 is promptly suppressed by the indirect energy consumption form that the energy is consumed by the damper 12. At this time, the damping force to the chimney 1 is optimally obtained by selecting the mass of the weight 8, the moving stroke, and the natural period. Since the spring 11 is mounted vertically between them, the spring 11 exerts a horizontal component force on the weight 8 when the spring 20 is stretched diagonally to the left and right with the pin 20 on the bracket 15 side as a fulcrum and restored. Therefore, since the amount of expansion is small as compared with the case of expanding and contracting in the horizontal direction like the spring i shown in FIG. 14, the movement of the weight 8 is not restricted, and therefore the natural period of the weight 8 is limited by the spring 11. Or adjusting the restoring force of the spring 11,
The weight 8 can take a large moving stroke.

Further, since the work for adjusting the length of the long rope d as shown in FIG. 13 is unnecessary, the chimney 1
It is possible to easily adjust the natural period of the weight 8 even for a tower-like structure having a long natural period such as. In order to adjust the spring constant of the spring 11, an elongated hole extending in the vertical direction is provided in the bracket 14, and a bolt is inserted into the elongated hole instead of the fixing pin 19 and fixed with a nut. You may

In the embodiment shown in FIGS. 1 (a), (b) and (c), the one vibration damping device I is adapted to cope with the horizontal swing of the chimney 1 as a tower-like structure. An example,
This is shown as a schematic plane as shown in FIG. 2 (a), but the present invention is not limited to this, and one or a plurality of units may be installed according to the scale of the tower structure and the direction in which the tower structure shakes. Try to use it. That is, in the case where the chimney 1 is installed near the upper end of the chimney 1 as a tower-shaped structure and the vibration of the chimney 1 in the horizontal direction (arrow X direction) is to be dealt with, FIG.
As shown in FIG. 1, a damping device I is installed on one side of the chimney 1 in the left-right direction.
In addition to installing only one stand, as shown in FIG. 2B, one set may be installed on each side of the chimney 1 in the left-right direction, or as shown in FIG.
As shown in FIG. 3, a plurality of units may be installed on both sides of the chimney 1 in the left-right direction. On the other hand, in the case where the chimney 1 is shaken in the front-back direction (arrow Y direction), it is shown in FIG. As shown in FIG. 3B, one damping device I is installed on one side of the stack 1 in the front-rear direction, or one on both sides of the stack 1 in the front-rear direction, as shown in FIG. ), A plurality of units may be installed on both sides of the stack 1 in the front-rear direction. Further, in order to deal with the swing of the stack 1 in the left-right direction and the front-rear direction and the whirling associated therewith, FIG. As shown in (a), one vibration damping device I is installed on each side of the chimney 1 in the left-right direction and the front-rear direction, or as shown in FIG.
Install one on each side of the chimney 1 in the left-right direction and the front-rear direction, or install multiple units on each side of the chimney 1 in the left-right direction and the front-rear direction, as shown in FIG. Good.

Next, FIG. 5 shows another embodiment of the present invention, which is an active type in the same configuration as shown in FIGS. 1 (a), (b) and (c). . That is, a fluid pressure cylinder 21 as an actuator is arranged between the base plate 2 to which the damper 12 is attached and one end surface of the weight 8, and the fluid pressure cylinder 21 is connected to the base plate 2 and the weight 8. The weight 8 is moved along the guide rail 6 in the left-right direction.

In the embodiment shown in FIG. 5, when a sway is generated in the chimney 1 and the sway is detected by a sway detection sensor (not shown), a displacement signal phase-controlled based on the signal is controlled (not shown). The fluid pressure cylinder 21 is sent from the device to the driver of the fluid pressure cylinder 21, and the fluid pressure cylinder 21 is expanded and contracted. As a result, the weight 8 is repeatedly moved to the left and right, and the movement of the weight 8 is consumed by the damper 12, whereby the sway of the chimney 1 can be quickly suppressed. At this time, as in the case shown in FIGS. 1A, 1B, and 1C, the spring 11 is stretched obliquely in the left-right direction, and the horizontal component force at the time of restoration acts on the weight 8. Can stably perform repetitive movements that are synchronized with the natural period of the chimney 1. The damper 12 may be omitted, and the fluid pressure cylinder 21 may serve both to generate and attenuate the driving force.

Further, FIGS. 6 (a) and 6 (b) show another example in the case of being constructed as an active type. Instead of the fluid pressure cylinder system shown in FIG. 5, a reciprocating drive mechanism driven by a motor is adopted. It was done. That is, the through hole 24 is provided in the left-right direction so as to pass through the center of gravity of the weight 8, and the through hole 24
A bearing in which the screw rod 25 is inserted through the screw rod 25, the screw nut 26 screwed to the screw rod 25 is fixed to the center of gravity of the weight 8, and both ends of the screw rod 25 are fixed to the inner surface of the cover casing 13. 27a
And the bearing 2 on the pedestal 30 overhanging the base plate 2
7b is rotatably supported and further screw rod 2
A motor 29 as an actuator is connected to the protruding end of the bearing 5 on the bearing 27b side through a gear mechanism 28, and the motor 29 is driven by a drive signal whose phase is controlled based on a signal from a shake detection sensor (not shown). By transmitting the driving force of 29 to the screw rod 25 via the gear mechanism 28, the weight 8 is repeatedly moved in the left-right direction integrally with the screw nut 26.

Even if it is constructed as shown in FIGS. 6 (a) and 6 (b), the same operational effect as that shown in FIG. 5 can be obtained.

Next, FIG. 7 shows still another embodiment of the present invention, wherein FIG. 1 (a) (b) (c) (or FIG.
In a configuration similar to that of the embodiment shown in FIGS. 6A and 6B, a plurality of natural period adjusting springs 11 (three in the figure) are attached between the lower surface of the weight 8 and the support 10. It is intended to be used.

As shown in FIG. 7, the use of a plurality of springs 11 is advantageous because the weight 8 having a larger mass can be handled.

Further, FIGS. 8 (a) and (b) show still another embodiment of the present invention, and FIGS. 1 (a), (b) and (c) (or FIGS. 5 and 6 (a) ( Instead of providing the long hole 7 in the central portion of the floor frame 5 in the embodiment shown in (b)), the positions of the long hole 7 provided in the floor frame 5 are set to two positions outside the guide rail 6, and Two springs 11 are symmetrically attached in the vertical direction between the side surface of the weight 8 and the support 10 through the one long hole 7. If necessary, a plurality of springs 11 may be attached to both sides, or a plurality of springs 11 may be attached to only one side.

Even in the embodiment shown in FIG. 8, the same operational effect as in the embodiment shown in FIG. 7 can be obtained.

FIG. 9 shows still another embodiment of the present invention, which is shown in FIG. 1 (a) (b) (c) (or FIG. 5, FIG. 6 (a) (b)). In the same configuration as in the above embodiment, instead of attaching the natural period adjusting spring 11 between the weight 8 and the support 10 through the long hole 7 provided in the floor frame 5, the support 10 is covered. The long hole 7a is fixed at a position above the casing 13 and extends in the left-right direction in the front-rear center of the upper surface cover portion of the cover casing 13. The long hole 7a is supported through the long hole 7a to the upper-surface center portion of the weight 8. The natural period adjusting spring 11 is attached between the base 10 and the lower surface. Also, FIG.
FIG. 1 shows a modified example of FIG. 1 in which the top and bottom of the embodiment shown in FIGS. 1A, 1B, and 1C (or FIGS. 5 and 6B and 6B) are arranged in reverse. In addition, in the case of the example of FIG. 10, the spring 11 also takes into consideration the lifting force of the weight 8.

As described above, the intended purpose can be achieved even with the configuration shown in FIGS. 9 and 10.

In the above, the respective embodiments shown in FIGS. 5 to 10 are also used as shown in FIGS. 2, 3 and 4.

The present invention is not limited to the above-mentioned respective embodiments, and for example, FIG.
(C) (or FIG. 5, FIG. 6 (a), (b)) is further modified so that, as shown in FIG. 11 (a), between the both ends in the moving direction of the weight 8 and the support base 10. 11 (b), one or a plurality of springs 11 may be attached diagonally in the vertical direction so as to antagonize left and right with respect to the left and right, or the embodiment of FIG. Weight 8 as shown in
One or a plurality of springs 11 may be attached diagonally in the vertical direction between the opposite ends of the moving direction of the above and the support base 10, and the springs 11 in the above-described embodiment. Although the case of a so-called tension coil spring is shown, the invention is not limited to this, and for example, FIG.
As shown in (a) and (b), a spring built-in type cylinder structure in which the compression coil spring 22 and the laminated disc spring 23 are built in may be used. In this case, the springs 22 and 23 have a desired compression force. (Precompression) is used as a stretching force, and any type of damper 12, such as fluid pressure type, mechanical type, electric type, gas type, etc., can be arbitrarily adopted. It is needless to say that if the base plate 2 in the above form is a band type, it can be easily attached to an existing tower-like structure, and various changes can be made without departing from the scope of the present invention.

[0031]

As described above, the tower structure vibration damping device of the present invention exhibits the following excellent effects. (1) In the vicinity of the upper end of the tower-shaped structure, a vibration damper is supported movably in the horizontal direction, and between the vibration damper and the tower-shaped structure side,
Since the natural period adjusting springs arranged in the vertical direction are interposed, even if the spring constant or length of the spring is changed by stretching the spring in a diagonal direction when the vibration damper moves Does not limit the movement of the vibration suppressor as compared to the case where it is mounted horizontally, and therefore, even for tower-like structures with a long natural period, the vibration of the vibration suppressor is not restricted by mechanical springs. The natural period can be easily adjusted. (2) A floor frame is provided on the outer surface portion near the upper end of the tower-like structure, and a vibration damper is movably mounted in the horizontal direction on the floor frame, and above or below the vibration damper. Attach a support to the outer surface of the tower structure so that it is located,
By providing a structure in which a natural period adjusting spring is attached between the support and the vibration damping body so that a stretching force acts in the vertical direction, the spring does not overhang in the horizontal direction,
The entire device can be made compact and unitized, and it can be manufactured at low cost. Furthermore, by selecting the number of springs installed and the number of installed devices, it is easy to respond to weight changes due to the size of the structure. can do. (3) The natural period adjusting spring is used as a tension spring and pretension is applied to the natural period adjusting spring, or the natural period adjusting spring is used as a compression spring and precompression is applied to the natural period adjusting spring. By adding the above, the natural period of the vibration damper can be adjusted arbitrarily. (4) By adopting a configuration that includes an actuator for repeatedly moving the damping body in the horizontal direction,
It can be configured as an active type and can exhibit a higher vibration damping effect.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which (A) is a partially cutaway schematic front view, (B) is a view in the direction of AA in (A), and (C) is (A). FIG.

FIG. 2 is a view showing a state in which the tower structure vibration damping device of the present invention is installed so as to correspond to a lateral sway of a chimney.
FIG. 3 is a schematic plan view showing an example in which one is installed on one side, (b) is installed on each side, and (c) is installed on each side.

FIG. 3 is a view showing a state in which the tower structure vibration damping device of the present invention is installed so as to correspond to the sway of the chimney in the front-rear direction.
FIG. 3 is a schematic plan view showing an example in which one is installed on one side, (b) is installed on each side, and (c) is installed on each side.

FIG. 4 shows a state in which the tower structure vibration damping device of the present invention is installed so as to correspond to the lateral and longitudinal sway of the chimney, and (a) shows one unit in the lateral direction and one in the longitudinal direction. (B) is a schematic plan view showing an example in which one unit is installed on each of the left-right direction and the front-rear direction, and (c) is a plurality of units installed on both the left-right direction and the front-rear direction.

FIG. 5 is a partially cut-away schematic front view showing a case where an active type is configured as another embodiment of the present invention.

6A and 6B show another example in the case of being configured as an active type, in which FIG. 6A is a partially cutaway schematic front view, and FIG. 6B is a view taken in the direction of arrows CC in FIG.

FIG. 7 is a partially cutaway schematic front view showing still another embodiment of the present invention.

FIG. 8 shows still another embodiment of the present invention,
(A) is a partially cutaway schematic front view, and (B) is a DD direction arrow view of (A).

FIG. 9 is a partially cutaway schematic front view showing still another embodiment of the present invention.

FIG. 10 is a partially cutaway schematic front view showing a modified example of the present invention.

FIG. 11 shows still another modified example of the present invention,
(A) is a schematic diagram showing an example corresponding to FIG. 1, and (B) is a schematic diagram showing an example corresponding to FIG. 9, respectively.

FIG. 12 shows another form of the natural period adjusting spring, in which (a) is a structural example view using a compression coil spring, (b).
[Fig. 4] is a structural example view using a disc spring.

FIG. 13 is a schematic view showing an example of a conventional vibration damping device.

FIG. 14 is a schematic view showing another example of a conventional vibration damping device.

[Explanation of symbols]

1 Chimney (tower structure) 5 floor frames 8 damping body 10 Support 11 Natural period adjustment spring 21 Fluid pressure cylinder (actuator) 29 Motor (actuator)

Claims (5)

[Claims] 1. A natural period in which a damping body is movably supported in the horizontal direction near the upper end of a tower-like structure, and is vertically arranged between the damping body and the tower-like structure side. A tower-like structure vibration damping device having a structure in which an adjusting spring is interposed. 2. The outer surface near the upper end of the tower-shaped structure,
A floor frame is provided, a damping body is mounted on the floor frame so as to be movable in the horizontal direction, and a support base is attached to the outer surface portion of the tower-like structure so as to be located below or above the damping body. A tower-like structure vibration damping device having a structure in which a natural period adjusting spring is attached between the support and the vibration damping body so that a stretching force acts in the vertical direction. 3. The natural period adjusting spring is a tension spring,
3. The tower structure vibration damping device according to claim 1, wherein pretension is applied to the natural period adjusting spring. 4. The natural period adjusting spring is a compression spring,
3. The tower structure vibration damping device according to claim 1, wherein pre-compression is applied to the natural period adjusting spring. 5. The tower-like structure damping device according to claim 1, further comprising an actuator for reciprocating the damping body in a horizontal direction.