JPH02204580A - Damping device for building - Google Patents

Abstract

PURPOSE:To fulfill a damping effect with a simple structure by suspending a movable body having a certain mass from a structure and supporting this movable body by the structure by means of hydraulic cylinders, etc., via universal joints. CONSTITUTION:A movable body 1 having a certain mass is horizontally suspended from the top portion of a frame 8 fixedly installed on a building by means of arms 2, 2 via universal joints 3. Two hydraulic cylinders 4, 5 are installed between the frame 8 and movable body 1 at a right angle to each other while being joined by the use of universal joints 6, 7 respectively. When shaking occurred in the building, the hydraulic cylinders 4, 5 drive the movable body 1 in the same direction to make the inertial resistance of the movable body 1 efficiently act as the damping force of the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a vibration damping device for suppressing the shaking of structures such as buildings and towers due to earthquakes and the like.

(Prior Art) As an allocating device for allocating the shaking of a structure such as a building due to an earthquake, a movable body (with a predetermined mass) ( It is known that a mass) 1 is supported for free horizontal displacement, and a hydraulic cylinder 22 is interposed horizontally between the movable body 1 and a building 20.

When the building 20 swings in the direction of the arrow in the figure, hydraulic oil is supplied to the oil chamber 23 on the extension side of the hydraulic cylinder 22, and the hydraulic cylinder 22 drives the movable body 1 to the left in the figure. Because of the inertial resistance of the movable body 1 against the extension of the hydraulic cylinder 22, the hydraulic cylinder 22 simultaneously presses the building 20 in the opposite direction to the shaking direction, thereby suppressing the shaking of the building 20. Further, when the building 20 swings in the opposite direction, hydraulic oil is supplied to the oil chamber 24 on the contraction side of the hydraulic cylinder 22, and the hydraulic cylinder 22 applies a tensile force based on the inertial resistance of the movable body 1 to the building 20. This suppresses shaking.

(Problem to be solved by the invention) In this case, the frictional resistance between the relatively displaced movable body 1 and the building 20 reduces the pressure and tensile force exerted on the building 20 by the hydraulic cylinders, i:2 against the shaking. So,
It is desirable that it be as small as possible.

However, in the case of the rolling bearing 21, it has been difficult to reduce the frictional resistance beyond a certain level.

On the other hand, if a hydrodynamic bearing is used instead of the rolling bearing 21, the frictional resistance can be further reduced, but it is considerably more costly than the rolling bearing 21, and is difficult to deal with sudden shaking without delay. , it was necessary to keep the movable body constantly floating via fluid, and energy supply was essential for this purpose.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a vibration damping device with a simple structure that suppresses frictional resistance against displacement of a movable body.

(Means for Achieving the Object) The present invention suspends a movable body with a predetermined mass from a building, and supports this movable body on the building via a universal joint using a hydraulic cylinder or a hydraulic damper. ing.

(Function) The hydraulic cylinder or hydraulic damper drives the movable body in the same direction in response to the shaking of the building. At this time, almost no frictional resistance occurs between the movable body suspended from the building and the building, and the inertial resistance of the movable body is efficiently converted into vibration damping force of the building.

Further, the universal joint rotates the hydraulic cylinder or the hydraulic damper to an arbitrary angle in a three-dimensional direction following the relative displacement between the movable body and the building.

(Example) Embodiments of the present invention are shown in FIGS. 1 to 6.

In FIGS. 1 and 2, reference numeral 1 denotes a movable body suspended horizontally from the top of a seven-frame frame 8 fixed to a building by four parallel rigid member arms 2 of equal length.

The movable body 1 and the arm 2 and the arm 2 and the frame 8 are connected via a universal joint 3, respectively. Furthermore, an emergency buff γ19 is attached around the movable body 1 to cushion the impact in the event of a collision with the frame 8.

Hydraulic cylinders 4 and 5 are interposed between the movable body 1 and the 7-frame 8 so as to be perpendicular to each other. Hydraulic cylinders 4 and 5 both have cylinder tubes 4A and 5A with 7 frame 8
Then, the tips of the piston lofts 4B and 5B are connected to the center of the movable body 1 via universal joints 6 and 7, respectively. Note that the hydraulic cylinders 4 and 5 are arranged with the piston rods 4B and 5B facing slightly downward.

As shown in FIGS. 3 and 4, the universal joint 6 includes a horizontal rotating member 11 that is rotatably supported in the horizontal direction between brackets 10 fixed above and below a seven-frame frame 8, and a horizontal rotating member 11 that is supported on the inside thereof. The cylinder tube 4A (5A) is supported inside the bracket 13.

Further, as shown in FIGS. 5 and 6, the universal joint 7 includes a horizontal rotation member 16 that is supported by a central shaft 14 projecting upward from the center of the movable body 1 through a bearing 15 for horizontal rotation. and a rotating shaft 17 formed on the outside thereof.
Bracket 1 is freely supported for rotation in the vertical direction at
8, and the piston rod 4B (5
The tips of B) are joined.

Hydraulic oil is supplied to these hydraulic cylinders 4 and 5 from a separately provided hydraulic supply device via a valve unit 9 in a direction that counteracts the shaking of the building.

Next, the action will be explained.

When the building shakes, the parallel arm 2 moves the frame 8
The movable/moving body 1 suspended from the building tends to be displaced relative to the building due to inertia. In response, hydraulic oil is supplied from the hydraulic supply device to the hydraulic cylinders 4 and 5 via the control valve 9 at a rate corresponding to the direction of the shaking.
The hydraulic cylinders 4 and 5 drive the movable body 1 against this relative displacement in the same direction as the swing.

As a result, the movable body 1 swings in an arc defined by the parallel arm 2, and the hydraulic cylinders 4 and 5 also rotate the universal joints 6 and 7 while horizontally corresponding to the displacement of the movable body 1. and rotate up and down.

With the displacement of the movable body 1, a reaction force based on the inertia resistance of the movable body 1 acts on the hydraulic cylinders 4 and 5, and this reaction force is applied to the 7th frame 8 through the cylinder tubes 4A and 5A in a manner that is opposite to the shaking. Provides directional vibration damping force.

In this way, the movable body 1 is always driven in the same direction as the building sways, and exerts a damping force based on inertial resistance on the building to suppress the sway.

By the way, frictional resistance between the relatively displaced movable body 1 and the building occurs at the universal joint 3 that connects the swinging arm 2, the movable body 1, and the V building. The sliding distance of the sliding part is the moving body 1
Because it is considerably shorter than the relative displacement distance between the building and the building,
The frictional resistance generated is also extremely small, so the movable body 1
The inertial resistance of the hydraulic cylinders 4 and 5 is converted into an allocating force exerted on the building without waste, making it possible to damp the vibration of the building with good response and efficiency. Furthermore, by making the arm 2 longer, the rotation angle of the universal saw blade 3 becomes smaller, so that the frictional resistance can be further reduced.

Note that the number of arms 2 is not limited to four, and the same effect can be obtained even if the movable body 1 is suspended by three parallel arms 2. In addition, if the direction of the shaking of the building is limited to one direction, the arms 2 that suspend the movable body 1 may be attached to the building by increasing the distance between them so that two arms 2 are parallel to each other. and hydraulic cylinders 4 and 5.
It is only necessary to interpose only one of them in accordance with the direction of oscillation.Furthermore, it is also possible to suspend the movable body 1 using a flexible member such as a wire rope instead of a rigid member such as the arm 2.

Furthermore, in this embodiment, vibration damping is performed using so-called active moving ears that drive hydraulic cylinders 4 and 5 according to the direction of the shaking of the building, but hydraulic dampers are used instead of hydraulic cylinders 4 and 5. The present invention can also be applied to so-called passive operation in which the shaking of a building is suppressed by the damping force of these hydraulic dampers that expand and contract as the building shakes.

(Effects of the Invention) As described above, the present invention suspends a movable body from a building and supports this movable body on the building via a universal joint using a hydraulic cylinder or a hydraulic damper, so that vibrations of the building can be avoided. On the other hand, a hydraulic cylinder or a hydraulic damper can efficiently and responsively apply a damping force based on the inertial resistance of a movable body to a building, resulting in an excellent damping effect.

Further, since no complicated mechanism is required, the structure is simple, it can be implemented at low cost, and maintenance is easy.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention. Figure 1 is a side view of the vibration damping device, Figure 2 is a plan view, and Figure 3 is a universal joint connecting the frame and hydraulic cylinder. 4 is a rear view, FIG. 5 is a side view of the universal joint that connects the movable body and the hydraulic cylinder, and FIG. 6 is a plan view. Moreover, FIG. 7 is a schematic side view of a vibration damping device showing a conventional example. 1... Movable body, 2... Arm, 3.6.7... Universal joint, 4, 5... Hydraulic cylinder. Figure 1: Movable body 4.5 = Hydraulic cylinder 8: Frame patent applicant Kayabae Gyo Co., Ltd. Figure 2 Figure 3 Figure 7 Figure 4

Claims (1)

[Claims] A vibration damping device for a building, characterized in that a movable body having a predetermined mass is suspended from the building, and the movable body is supported by a hydraulic cylinder or a hydraulic damper on the building via a universal point.