JPS58210202A - Vibration attenuating support apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loss bearing VT south of an earth-resistant lining structure.

In general, the propagation velocity of l earthquake is high in the same ground, and the acceleration is also small, but the amplitude is small. On the other hand, in soft ground,
Conversely, the acceleration is small, but the amplitude is large.

Earthquake loads applied to the foundations of bridges, buildings, machinery, etc. that are fixed to surface ground can be calculated from the acceleration of seismic motion, but the load on the 1E structure due to the amplitude is calculated by the impact of the pillars, etc. that support it. The transmission force changes depending on the size of the constant.

In soft ground, the 7Jl+ velocity of seismic motion is small, but the amplitude is large, so the load on the superstructure due to the amplitude is an important design element.

SUMMARY OF THE INVENTION An object of the present invention is to provide a loss bearing device capable of absorbing large amplitude earthquake motions.

The following five technical items are required for impairment bearing.

(1) Absorb the amplitude.

(2) Reduce the force transmitted to the upper structure.

3j. Must have resilience.

(1) Must have a braking function above a certain limit.

(5) Regarding horizontal movement of the lower shoe fixed to the foundation ground,
Able to move horizontally smoothly without lifting the upper shoe.

The impairment bearing device of the present invention satisfies all of these five requirements.

Hereinafter, embodiments of the present invention will be explained with reference to the drawings.

Figure 1 is a front cross-sectional view of two concave spherical surfaces, upper and lower, which are adjacent to each other with the concave portions inside (Hll). However, here, there are 174 curved surfaces based on spherical surfaces, so the curved surfaces are expressed as spherical surfaces. Hereinafter, the concave sphere on the -1- side (r) will be referred to as the upper shoe 1, and the concave spherical surface on the lower side will be referred to as the lower shoe 2.P.

is the center of the concave spherical surface of the upper shoe 1, P2 is the center of the concave spherical surface of the lower shoe 2, and R is each radius.

Figure 2 shows a suspension support as an i1 moving part that is installed in the inner space S formed by the upper and lower shoes 1 and 2 in Figure 1, while contacting the 1-, lower, and foot shoes 1 and 2, respectively. It is 5.

That is, the Tsuzumi bearing 5 is a medium/L-can iK+'-o,
, 02 are different upper and lower convex spherical surfaces 3 and 4 (each radius is r), which are joined together with their convex portions on the outside, and the lower convex spherical surface 3 and the lower convex spherical surface 4 are
Each has a center 00, 0□ outside the radius r of the convex sphere on the other side.

Figure 3 shows the suspension bearings 5 in Figure 2 and the upper and lower shoes 1 in Figure 1.
, 2 is shown incorporated into the inner space S of . That is, in a steady state, the downward convex spherical surface 6 is in contact with the concave spherical surface of the upper shoe 1 at point U, and the downward convex spherical surface 4 is in contact with the concave spherical surface of the lower shoe 2 at the point U. In other words, U and L each serve as a fulcrum.

Earthquake motion occurs here, as shown by the two-dot chain line in Figure 3.
Assume that the lower shoe 2' is laterally displaced by δ with respect to the upper shoe 1. At this time, the suspension support 5' changes its fulcrum while rolling on the concave spherical surfaces of the upper and lower shoes 1°2' while the upper and lower convex spherical surfaces 3' and 4 are integrated, so that the upper and lower fulcrums U', A deviation (distance e) of L' occurs. Therefore, since loads are applied from above and below, a couple is generated, which acts as a restoring force (technical requirement item (3)).

Further, as shown by the broken line arrows in FIG. 3, the upper and lower convex spherical surfaces 6' of the support 5' are connected to the concave spherical surface of the upper shoe 1.

At the point where 4' are in contact with each other at the same time, the suspension support 5' cannot move. Along with this, the lower shoe 2' also becomes unable to move, and the braking action (item (4) above) is activated. 10. When the lower shoe moves and U'L' becomes the contact point, U'L' of the support and L'L' of the upper shoe and lower shoe are generally not equal, so create a curved surface that makes these values equal. , This allows the upper and lower shoes to move horizontally.

In addition, the suspension bearing 5 can absorb the amplitude of earthquake motion by rolling the upper and lower convex spherical surfaces 6.4 (the above-mentioned item l).
11), and the force transmitted to the upper structure can be reduced (item 12)).

Therefore, the impairment bearing device according to an embodiment of the present invention, which incorporates the suspension bearing 5 in the inner full space S of the upper and lower shoes 1 and 2, has the above-mentioned technical requirements (1) to (
5) can all be satisfied.

Next, the case of elliptical bearing will be explained.

Fig. 4 shows a state in which the elliptical bearing 6 is inscribed in the inner space S of the lower shoes 1 and 2 (fulcrum points tJ, L) and installed at 3°.Here, the elliptical bearing 6 is - The bottom consists of two elliptical spherical surfaces 7°8, each bearing radius r' is smaller than the radius R of the upper and lower shoes 1.2, and each center O is within the radius of the ellipsoids on opposite sides. have.

In the case of the elliptical bearing 6, as in the case of the wrapping bearing 5,
The rolling of the upper and lower ellipsoidal surfaces 7 and 8 can absorb the amplitude and reduce the force transmitted to the upper structure.

Further, even if displacement occurs between the upper and lower shoes 1 and 2 due to earthquake motion, a restoring force will be exerted by the same mechanism as explained in the example of the suspension bearing 5.

Furthermore, in the case of the elliptical bearing 6, the upper and lower ellipsoidal surfaces 7 and 8
The points on the circumference of the common surface (connecting surface) are the upper and lower shoes 1,
2, and beyond that point, the upper and lower shoes 1 and 2 are lifted, exerting a large braking force.

In addition, in the impairment bearing device of the present invention, the upper and lower shoes 1 and 2
The radii of the concave spherical surfaces may be equal or different. Similarly, the radii of the first and lower convex spherical surfaces 6 and 4 of the suspension bearing 5 and the radii of the upper and lower convex spherical surfaces 7 and 8 of the elliptical bearing 6 may be equal or different. However, if the radius of the concave spherical surfaces of the upper and lower shoes 1 and 2 is 4, the radii of the upper and lower spherical surfaces of the suspension bearing 5 and the elliptical bearing 6 must be equal and equal to 5. .

If the radius of the concave spherical surface of upper and lower shoes 1 and 2 is obvious, upper shoe 1
The lower convex spherical surface 3 or elliptical bearing 6 of the suspension bearing 5 in contact with
The vertical displacement of the upper elliptical spherical surface 7 or the lower convex spherical surface 4 of the ellipsoidal support 5 or the lower spherical surface 8 of the elliptical support is caused by the vertical displacement that descends while rolling on the concave spherical surface 1. ,
It is sufficient to equalize the displacement in the vertical direction of the F shoe as it rises while rolling on the concave spherical surface.

In addition, due to the horizontal slippage of the upper and lower shoes 1 and 2, the suspension support 5
Or when the elliptical bearing 6 rolls on the curved surfaces of the upper and lower shoes 1 and 2,
In the case of a simple spherical surface with a constant radius, at the common point of contact between the shoe and the support, the spacing between the contact points on the support and the contact spacing between the top and bottom front points will not be equal, so the support will lift the shoe. Therefore, in the present invention, horizontal movement in the vertical direction is made possible by creating a special curved surface in the support or in the vertical direction. Next, the formation of this curved surface will be described.

As shown in FIG. 5, when the upper shoe 1 and the lower shoe 2 are moved the same distance on the left and right, the appellant's point D moves to the left and comes into contact with the support at point B. Since the support moves while rolling on the curved surfaces of the upper shoe 1 and the lower shoe 2, the arc of the upper shoe and the support becomes TD2TCo.

If the point of contact between this C8 point and the lower shoe 2 and the support is C', then the wheelbase CC' of the support, the point of contact B between the support and the upper shoe, and the point of contact between the support and the lower shoe are B', then CC'2BB' Must be. If the upper and lower fronts are also circular arcs, and the support is also a circular arc, the above formula generally does not hold.

Therefore, if the curved surface of the support is modified and horizontal movement is also performed on the contacting curved surface using the support, the curved surface will be calculated using the following calculation.

TD2TC.

1 r, ψ to r2 θ1. θ1−−ψ, (2) [2 Once the horizontal distance Za is determined, the angle of ψ is known, so 91 in the above equation is determined and the calculation is 0. is determined.

AO, two AP, -P, O.

2r, cosψI' (rl '2)=r, (cos
ψ, -1)+r2 Next, θ2jan '□ r, (co5ψ+1)+r2 Next, if O, C, are rotated and brought onto O-+Bi, and the point is 01, then on the vertical axis With the point to be projected as 02, 01C2-r2CO5θ Therefore, OI C20HA-e i 2r”2 CO5θ-r,
(cos ψ, -1) -r2 Only this el is supported C
If a curved surface is created by cutting at a point, it will touch at point B, and CC'2BB' can be formed. In this way, a curved surface at each point can be created.

Formation of curved surface of elliptical support: Figure 6 shows the case where the upper and lower shoes are moved the same distance on both sides. In Figure 6, the appellant's point D moves to the left and comes into contact with the support at point B.

However, the distance between the upper and lower contact points of the lower shoe is BB' It is.

If the support is a circle with equal diameter, the arc due to rolling is equal, so rIψI:r2θ12 θ1'-2%(1)2. The diameter of point 0 becomes CC', which becomes BB'\-CC', so this is L 'k Q
In order to adjust the circumference, perform the following calculation to find the curve.

r.

[1ψI −”2θl I θ10−ψ1
(3) 2 AOI 2 API PHO l) p, cos ψH (
rl r2) = r, cos ψ1 - "1 mo r2 2 r, (cos ψ, -1) - + - r2 Next, when the 6 points are brought on O and B, which is the θ angle, the point is C4
Then, 0,C2=r2cosθ Therefore, at -67, 2-increase=r to e,,CO3θ-r, (c
os ep, -1) r: If this el is cut at six points on the support to create a curved surface, the upper and lower shoes will be able to move horizontally. As shown by the two-dot chain line in Figure 6.

The size of the loss bearing device of the present invention is determined by first determining the radius of the convex sphere or elliptical sphere of the movable part, such as a truss bearing or an elliptical bearing.

That is, the material is selected depending on the magnitude of the load, the place of use, and the environment, and the radius of the convex sphere or elliptical sphere is calculated from the elastic modulus of the material and the allowable capoisso/ratio based on Hertz's formula. Alternatively, it is determined by the standards in each sector.

Next, after determining the permissible travel distance of the movable part, the radius of the upper and lower shoes is determined.

As explained above, the impairment bearing device of the present invention has (1)
Absorption of amplitude, (2) Suppression of force transmitted to the superstructure, (3)
Since it has five functions: restoring force, (4) braking action, and (5) horizontal movement, it can work effectively as a loss support for bridges, buildings, mechanical devices, etc.

In addition, as another aspect, the device according to the present invention can be smoothly operated by forming an involute tooth profile so that no upward movement occurs at the contact surfaces of the bearing and the upper and lower shoes.

[Brief explanation of drawings]

Fig. 1 is a front cross-sectional view of the upper and lower shoes, Fig. 2 is a front cross-sectional view of the tie support, and Fig. 3 is a front view of a loss bearing device according to an embodiment of the present invention in which the wrap support is incorporated in the upper and lower shoes. 4 is a front sectional view of an impairment bearing device according to another embodiment of the present invention in which an elliptical bearing is incorporated in the lower shoe, and FIG. 5 is a front sectional view in which a suspension bearing is incorporated in the upper and lower shoes An explanatory diagram showing the movement of a loss bearing device according to one embodiment of the present invention, and FIG. It is an explanatory diagram showing movement of +. 1...Upper shoe, 2...Lower shoe, 6...Upper convex spherical surface, 4...
・Downward convex spherical surface, 5... Tsuzuru bearing, 6... Elliptical bearing, 7
... Upper ellipsoidal surface, 8... Lower ellipsoidal surface. 1 4-1 [J2 Fig. 7 f:j・5. pa

Claims (1)

[Claims] 1. Two concave curved surfaces 1-1 adjoining each other with the concave portions inside, and an inner space formed by the two concave curved surfaces, in contact with each of the concave curved surfaces, and incorporating A loss bearing device comprising a DJ moving part in which two convex curved surfaces having different center positions are connected to each other with the convex portion facing outward. 2. The impairment bearing device according to claim 1, wherein the operating portion is a wrap bearing having a center L outside the radius of convex curved surfaces on opposite sides. 3. In claim 1, the LIJ moving part has a radius smaller than the radius of the two concave curved surfaces as the bearing radius,
Impairment bearing Fj': .