JPH01137078A - Torsion preventive mechanism of vibration damper - Google Patents

Abstract

PURPOSE: To provide a mass-added vibration control device not twisted in a narrow space by arranging fixed booms and a moving boom above a mass, and fixing a moving section fitted to the moving boom to the mass. CONSTITUTION: In this mass-added vibration control device, a pair of fixed booms 31, 32 located vertically above a mass and spatially parallel to a sliding plate are fixed to a structure. A moving boom 34, which can be moved in the direction perpendicular to the plane including the fixed booms 31, 32 while both ends are moved along the loops 31A, 32A of the fixed booms 31, 32, is provided. A moving section 41 movable along the axial direction of the moving boom 34 is fitted to the moving boom 34 and is fixed to the mass vertically above the mass. The moving section 41 is moved only in the horizontal plane after the movement of the mass, its movement in the vertical direction is suppressed, and a twist can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a torsion prevention mechanism of a vibration damping device, particularly a method in which the vibration damping device has a mass added thereto (this is referred to as a "mass addition method"). ).

(Prior art) The mass addition method is applied not only to installed equipment, but also to high-rise buildings such as towers to cope with vibrations caused by earthquakes, etc. ).

This will be explained with reference to FIG. 6, but here, only so-called lateral shaking, in which an excitation force acts on a building in a direction parallel to the ground, will be considered.

The figure is a plan view of the vibration damping device, in which a flat plate (sliding plate) 3 with a smooth vertical upper surface is integrated with a base 2 centered on a point O on a vertical line passing through the center of gravity of the building. It is fixed to the rooftop 1 of a building, and on top of this plate 3, a rectangular parallelepiped-shaped square 5 having a weight of approximately 1% of the weight of the building and having a smooth vertical bottom surface is gently placed. ing.

If, for example, an earthquake occurs in this state, the plate 3 will move up and down in the figure, centering on point O, together with the building.

It can swing left and right or diagonally.

However, the mass 5 is not interlocked with the plate 3 and theoretically remains stationary. Since the plate 3 and the mass 5 are only connected by the frictional force due to the mass 5's own weight, the excitation force due to the earthquake cannot directly act on the mass 5, and according to Newton's law of motion, the mass 5 This is because it tries to maintain a stationary position.

Therefore, when the horizontal shaking of a building is regarded as a vibration system, when the building and the mass 5 are connected, the mass 5 can act as a damping term to attenuate vibrations. Specifically, square 5 and shilling mound fixed on rooftop 1) 6
Hydraulic cylinder 7 A, with both ends pin-coupled to A and 6B.
A pair of hydraulic cylinders 7A and 7B are arranged in each direction vertically and horizontally, and this pair of hydraulic cylinders 7A,
7 B is expanded and contracted.

However, simply placing the mass 5 on the plate 3 cannot stop the mass 5 from rotating clockwise in the figure or in the opposite direction, so when the mass 5 rotates due to some force, this rotational force As a result of this reaction, torsional torque about the vertical axis passing through the center of gravity acts on the building, resulting in an undesirable situation.

Therefore, the link mechanism 1 that prevents the mass 5 from rotating
0 is provided, but since this spatially constitutes two parallel motion mechanisms, a perspective view is shown in FIG.
One end of a pair of equal-length links 11 and 12 is connected to the roof 1 by a hinge 16°17 that can only rotate in one direction, and the other end is connected to a link 13 having a length equal to the distance between the hinges 716°17. Universal join) Connected at 18.19. One end of another pair of equal length links 14, 15 is also connected to this join) 18, 19, and the other end is connected to the mass 5 at another universal join) 20, 21. In addition, the distance between 20.21 is link 13
It is taken equal to the length of.

Therefore, the three links 11 to 13 and both hinges 16,
With link 22 connecting 17, three links 13 to 15
and the link 23 connecting both joints 20 and 21 form a parallelogram, so the link 23 is connected to the link 22.
is regulated so that it is parallel to In other words, square 5 is a link @vlIi.

It is only allowed to move horizontally in each direction within the plane shown in FIG. 6 while being guided by the object, and is prohibited from rotating. Note that 25 to 28 are stoppers.

(Problems to be Solved by the Invention) By the way, according to such a parallel movement mechanism, the lengths of the links 11 to 15 and the angles of the links 11 and 12 are adjusted so that the mass 5 covers the range in which it can move on the plate 3. Since the swing angle a is determined, the space occupied by the link P11 structure 10 becomes large. For example, in Figure 8, Noyoin)
Since the position of 18 and 19 swings around the hinges 16 and 17, it can move in either vertical or horizontal directions. It turns into something.

For this reason, considering that it is necessary to install not only vibration damping devices but also various equipment such as air conditioning equipment on the roof of a building, in some cases it may not be possible to secure the space occupied by the link mechanism, making it difficult to install it. It becomes impossible.

The present invention has been made in view of the problems of the conventional example, and aims to provide a spatially compact mass rotation prevention mechanism.

(Means for Solving the Problems) This invention fixes a flat plate in a plane parallel to the ground at a position above a structure, and places a mass on the plate that has a constant weight and can slide on the plate. While putting it on this square and lI! In the vibration damping device, the vibration damping device is connected to the dyed article via an extensible actuator, and the actuator expands and contracts in response to the shaking direction of the structure, and the vibration damping device is located vertically above the mass and is connected to the plate with respect to the structure. While a pair of spatially parallel beams are fixed, a beam is arranged that is movable in a direction perpendicular to the fixed beam within a plane that includes these fixed beams, and is movable in the axial direction of this movable beam. A movable part was fixed to the mass.

(Function) According to the present application, a mechanism similar to an overhead crane is constructed between the ceiling provided vertically above the mass and the mass, and the mass moves in the same manner as the club of the overhead crane. Here, since the club can only move horizontally relative to the ceiling, the mass also only moves horizontally relative to the ceiling, thereby preventing rotation of the mass.

On the other hand, according to the overhead crane, the beams and clubs can only move in the horizontal plane, so Book 1!8! The movable parts of the structure also follow the movement of the mass and move only in the horizontal plane, unlike conventional examples.
It cannot move vertically. Therefore, there is no need to specifically secure a movable space in the vertical direction, and the mechanism is configured to be spatially compact.

(Embodiment) FIGS. 1 to 3 show an embodiment of the mechanism of the present invention, and are a schematic plan view, a right side view, and a front view, respectively. Since the configuration of the vibration damping device itself is the same as the conventional one, the overall plan view and front view are shown in Pt54 and FIG. 5, and a description of the vibration damping device will be omitted. The damping device is preferably installed on the top floor (for example, the rooftop) where the horizontal shaking is most severe, and the center of gravity of the square 5 is initially set to be on a vertical line passing through the center of gravity of the structure (for example, the building).

As shown in FIGS. 2 and 3, a ceiling 30 is provided above the sliding plate 3 in the vertical direction on which the mass 5 is placed, and a pair of prismatic beams 31 and 32 are installed on this ceiling 30.
are fixed at the same vertical height from the plate 3 so that they are spatially parallel to the plate 3. Note that in this example, the entire ceiling 30 is formed flat, but
Theoretically, the entire shape does not need to be flat, and any shape that does not hinder the movement of the movable beam 34 described later may be sufficient.

However, sky 3 is also on the upper layer of ceiling 30! Considering that the ceiling 30 is used for installing equipment such as equipment, the ceiling 30 is configured to be substantially flat.

For a pair of fixed beams 31.32, fixed beam 31.
One prismatic beam 34 is provided which is movable in a direction perpendicular to the fixed beam (in the vertical direction in FIG. 1) within a plane including 32. This means that one fixed beam 31 (or 32) has an antinode 31 at each end of the movable beam 34.
2 holding A, 31 B (or 32 A, 32 B)
A pair of idle rollers 36A to 36D (or 38A to 38
By fixing the movable part 35 (or 37) that holds D), the movable beam 34 is moved in the left-right direction in FIG. It can move in parallel. In addition, 39A to 39D and 40A to 40D are also idle rollers, and the movable beam 34 and the movable part 35°37f)
It rolls on a flat plate-shaped poid 33 fixed to the vertical lower part of the fixed beams 31 and 32.

Further, a movable part 41 that is movable in the axial direction of the movable beam 34 is configured with respect to the movable beam 34, and this movable part 41
is fixed vertically above the square 5.

The movable part 41, like the above-mentioned movable parts 35 and 37, holds two pairs of idle rollers 42A to 42D that sandwich the bellows 34A and 34B of the movable beam 34, and these rollers 42A
~42D is the belly of the beam 34A.

34B, the movable ff1s41 moves in parallel with the mass 5 in the vertical direction in FIG.

If we consider the movement of the movable part 41, that is, the mass 5 that moves integrally with the movable part 41 within the plane shown in FIG. The movement is similar to that of a club moving along a girder that spans a running rail. In other words, the club only moves in parallel in the ceiling space within the building with the building as a fixed coordinate system, but square 5 also only moves in parallel in the coordinate system in which the horizontal direction is the X axis and the vertical direction is the y axis in Figure 1. do. For example, if the mass 5 tries to move in the y-axis direction, due to the rolling contact between the movable beam 34 and the movable part 41, the mass 5 moves in parallel with the stationary movable beam 34 as an id, and moves in the x-axis direction. When it tries to move, the mass 5 moves in parallel with the fixed beams 31.32 as an id due to the rolling contact between the pair of movable parts 35, 37 and the fixed beams 31.32. Furthermore, in the diagonal direction, the movement is a mixture of both.

In general, the mass 5 can move freely within the horizontal plane where the excitation force associated with an earthquake etc. is applied, but in this case, the ceiling 30
It is only allowed to translate parallel to the object, not rotate. When square 5 tries to rotate,
Rollers (36A to 36D and rollers 38A to 38D) whose rotational reaction force ultimately makes rolling contact with the fixed beam 31.32
This is because it can be received at Therefore, rotation of the mass 5 is prevented in the same way as in the conventional case.

On the other hand, the movable parts of this mechanism (the movable beam 34 and the movable part 4
Considering the possible movable range of 1), the movable beam 34 and the pair of movable parts 35 and 37 are within the same horizontal plane that is a predetermined height away from the plate 3 in the vertical direction, and the other movable parts 41 are also approximately within the same horizontal plane. Since it only moves and does not move vertically, it requires a somewhat wide range in the horizontal direction, but in the vertical direction there is enough space to actually construct a mechanism similar to an overhead crane. That would be a good thing.

This focuses on the fact that even if the rotation of the mass 5 is prevented, in order to follow the movement of the mass 5 in the horizontal plane, it is sufficient to configure the mass 5 so that it can move flatly only in the horizontal direction.
If there is a link that swings around one point as in the conventional example, it will move not only horizontally but also vertically, causing unnecessary vertical movement! This results in the occurrence of the Jl 1i region.

That is, according to this example, if there is a small space between the ceiling and the ceiling provided vertically above the square 5, it is possible to configure the mechanism of the present application, and as a result, the mechanism of the present application can be constructed in the layer above the ceiling 30. It is also possible to install equipment such as air conditioning equipment, making effective use of the space on the top floor of the building.

The present invention can be applied not only to buildings but also to equipment and devices installed on floors or the ground.

(Effects of the Invention) As explained above, in a mass-addition type vibration damping device, the present invention provides an overhead crane and an approximate +
1;! 1vt is constructed, and this 8!1 structure is connected to the mass, so the trapping can be accommodated in a narrow space, and the space can be used effectively.

[Brief explanation of the drawing]

Figures 1 to 53 show an embodiment of the present invention, and are a schematic plan view and a right side view of a twist prevention device, respectively. The front view, #S4 and 5 are respectively a plan view and a front view of the entire structure including the damping device of this embodiment, and FIGS. 6 and 7 are a plan view and a front view of the conventional example. FIG. IS8 is a perspective view for explaining a conventional twist prevention mechanism. 1...Rooftop, 2...Base, 3...Sliding plate, 5...Mass, 6A, 6B...Silling mount,...Hydraulic silling, 30...Ceiling, 31
．． 32...Pair of fixed beams, 33...Id, 3
4... Movable beam, 35.37... Movable part, 36A
~36D, 38A-38D, 39A-39D, 40A
-40D・,? Id roller, 41...Movable part, 42A
~42D... Buitroller. Fig. 1 31. 32 --- A pair of fixed arms 4 34 --- Flexible heel 35. 37 --- Flexible arm 36A to 360--11 Pipe loaf 38A to 380 --- is the idler roller 41-- -1 Movable 42A ~ 420-, Q'ito'O-''7 Fig. 6

Claims (1)

[Claims] A flat plate is fixed in a plane horizontal to the ground at a position above the structure, and a mass having a constant weight and capable of sliding on the plate is placed on the plate,
In a vibration damping device that connects this mass and a building via an extensible actuator and expands and contracts the actuator in response to the shaking direction of the structure, the mass is located vertically above the mass and acts on the structure. A pair of beams spatially parallel to the plate are fixed, while a beam movable in a direction perpendicular to the fixed beams is arranged in a plane including these fixed beams, and the axis of this movable beam is A torsion prevention device for a vibration damping device, characterized in that a movable part movable in a direction is fixed to the mass.