JPH0645976B2 - Seismic isolation damper - Google Patents

Description

TECHNICAL FIELD The present invention relates to a seismic isolation damper for reducing an earthquake input and deformation above a damper mounting position in a building.

(Prior Art) FIG. 8 shows a typical example of an oil damper that constitutes this type of seismic isolation damper, in which a fixed opening (c) is provided in a piston (b) that slides in a cylinder (a). Therefore, when the oil in the cylinder escapes from the positive pressure side to the negative pressure side through the opening as the piston moves, a viscous resistance force that is generated substantially in proportion to the traveling speed of the piston is used.

(Problems to be Solved by the Invention) When an oil damper is used as a seismic isolation device, the viscous resistance D that can be taken with respect to the restoring force Kx (K: spring constant, x: displacement) of the device is D in FIG. _A is the limit.

When the viscous resistance is increased like D _CO in FIG. 9, the actual input D _CO + Kx is increased conversely, and as shown in FIG. 10, it is conversely increased and exceeds the planned maximum input.

The present invention has been proposed in view of the above problems of the prior art, and an object thereof is to improve while retaining a large damping effect and not increasing the seismic input to the superstructure. The point is to provide seismic isolation dampers.

(Means for Solving the Problems) In order to exceed the limit value D _A of the viscous resistance shown in FIG. 9 and suppress the input to the upper structure, as shown in FIG. are moved to the II, quadrant IV from the center, the I, Chapter III quadrant are those above object is achieved if Osaere within D _a, seismic isolation damper viscous fluid according to the order the invention Between the cylinder and the bypass arranged in parallel with the cylinder, one end flow path and the other end flow path, which are respectively arranged at both longitudinal ends of the cylinder, and in which valves are respectively interposed, The pistons are arranged in parallel between the flow passages at both ends, and are connected by intermediate flow passages each having a valve interposed therebetween, and a large viscous resistance is obtained at the beginning of the movement process of the piston in the cylinder. The valve of the flow path is sequentially opened with the movement of It is configured to reduce viscous resistance.

(Operation) Since the seismic isolation damper according to the present invention is configured as described above, as the building is shaken from one side to the other side during the earthquake and the piston moves in the cylinder, Between the bypasses arranged in parallel, the valves interposed in the communication passages sequentially arranged in the longitudinal direction of the cylinder open one after another, and the viscous fluid flows into the negative pressure side of the cylinder, Viscous resistance decreases.

Thus, a large damping force is given in the first half of the process in which the building is swayed from one side to the other, and the damping force is gradually reduced in the latter half of the process, and the input to the superstructure exceeds the planned maximum input while maintaining a large damping effect. There is no.

(Examples) The present invention will be described below with reference to illustrated examples.

In Fig. 1, (1) is a cylinder that constitutes the seismic isolation jack main body, (2) is a piston that slides in the cylinder (2),
(3) is a piston rod.

Bypass (4) is arranged in parallel with the cylinder (1),
Between the bypass (4) and the cylinder (1), one end channel (W ₁ ) and the other end channel (W ₅ ) in the longitudinal direction of the cylinder are sequentially provided,
In parallel, the flow paths in the middle of the flow paths (W ₁ ) (W ₅ ) at both ends (W ₂ ) (W ₃ ) (W ₄ )
Is provided, and the valves (V ₁ ) (V ₂ ) (V ₃ ) (V ₄ ) and (W ₁ ) (W ₂ ) (W ₃ ) (W ₄ ) and (W ₅ ) (V ₅ ) is installed.

Wherein each valve has a function of controlling the flow rate, the one end passage (W ₁₎ and a valve interposed at the other end passage _{(W 5) (V 1)} (V
_As shown in Fig. 2, ₅ ) is a thick mortise (v) above and below.
(V ') is projected and bypass (4) from cylinder (1) side
Flow rate when oil flows to the side ≈ 1-3, bypass (4)
Flow rate when oil flows from the cylinder side to the cylinder (1) side =
It is configured to be 1.

The intermediate flow path _{(W 2) (W 3)} (W 4) valve interposed (V ₂₎ (V
_As shown in Fig. _{3, 3} ) (V ₄ ) has a smooth upper end surface, a thick mortise (V ″) is projected from the lower end surface, and oil is bypassed from the cylinder (1) side to the bypass (4) side. When it flows, the flow path (W ₂ ) (W ₃ ) (W ₄ ) is blocked as shown by the dotted line to make the flow rate ≈ 0, and when the oil flows from the bypass (4) side to the cylinder (1) side, the flow rate is (V ₂ ) and (V ₄ ) are configured to be 1/3 to 1.0 (V ₃ ) and 1.0.

The seismic isolation damper (S) configured as described above includes, for example, as shown in FIG. 7, a lower outside of the building (P) and a foundation rising portion (Q) surrounding the lower part of the building (P). Intervened between.

Thus, at the time of an earthquake, as the building (P) swings from one side to the other, the piston (2) of the seismic isolation damper moves from the left side to the right side in FIG. At this time, the piston (2) moves through the flow path (W ₂ )
In the section (C ₁₎ to reach, the oil cylinder (1) → flow path (W ₅₎ → bypass (4) → the passage (W ₁₎ → Cylinder
(1) and the flow, the viscous resistance follows the curve D _B , and a large viscous resistance is obtained. (See Fig. 4A) The piston (2) further advances and passes through the section (C ₁ )
As it passes through (C ₂ ) (C ₃ ) (C ₄ ), the flow paths (W ₂ ) (W ₃ ) (W
Opens ₄₎ of the valve (V ₂₎ (V ₃₎ (V _4), oil cylinder (1) in from the respective flow paths to flow, the viscosity resistance decreases. This is shown in the lower part of FIG.

That is, when the piston (2) passes the section (C ₁ ), the viscous resistance curve leaves D _B , goes through the sections (C ₂ ) (C ₃ ) and descends along the curve D _C. In Figures 4B and 4C, the piston (2) is in the section (C ₂ ) (C ₃ )
6 is a flow chart of oil when moving the oil.

Further, when the piston (2) passes the section (C ₄ ), the viscous resistance curve reaches D _A. FIG. 4D is a flow chart of oil at this time.

Then, by adjusting the position and flow rate of each flow path, the peak of the viscous resistance D is moved from the center to the quadrants II and IV, and suppressed in D _A in the quadrants I and III to construct. A large damping force is applied in the first half of the process in which an object is swayed from one side to the other, and gradually reduced in the latter half to suppress the input to the superstructure while maintaining a large damping effect.

FIG. 5 shows the total restoring force obtained by adding the viscous resistance D and the spring restoring force Kx of the seismic isolation device, and it is possible to take a sufficiently large hysteresis area, which is shown in the schematic diagram of FIG. The amount of deformation x required for the earthquake can be minimized.

(Effect of the invention) As described above, the seismic isolation damper according to the present invention extends between the viscous fluid cylinder and the bypass arranged in parallel with the cylinder over the longitudinal direction of the cylinder. The flow paths are arranged at both ends in the longitudinal direction and are provided with valves, respectively. The flow paths are provided at both ends and between the flow paths at both ends. As a result, during an earthquake, a large damping force is applied in the first half of the process in which the building is swayed from one side to the other, and this damping force is gradually reduced in the latter half, maintaining a large damping effect and yet inputting to the superstructure. It can be suppressed so that it does not grow.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a seismic isolation damper according to the present invention and its viscous resistance curve diagram, and FIGS. 2 and 3 are vertical sectional views showing details of a valve, respectively, FIGS. 4A, 4B and 4C. Figures and 4D are respectively the oil flow chart in the seismic isolation damper, and Figure 5 is the total restoring force diagram of the seismic isolation device using the seismic isolation damper.
FIG. 6 is a schematic view of a seismic isolation device using the seismic isolation damper, FIG. 7 is a front view showing an example of use of the seismic isolation damper, and FIG.
The figure is a longitudinal sectional view of a conventional oil damper, Fig. 9 is a viscous resistance curve diagram thereof, and Fig. 10 is a total restoring force diagram of a seismic isolation device using a conventional oil damper. (1) …… Cylinder, (2) …… Piston (3) …… Piston rod, (4) …… Bypass (V ₁ ) (V ₂ ) (V ₃ ) (V ₄ ) (V ₅ ) …… Valve ( W ₁ ) …… one end channel (W ₂ ) (W ₃ ) (W ₄ ) …… middle channel (W ₅ ) …… other end channel

Claims (1)

[Claims] 1. A flow path at one end provided between a viscous fluid cylinder and a bypass provided in parallel with the cylinder at both ends in the longitudinal direction of the cylinder and each having a valve interposed therebetween. And the other end flow passage, which is also connected between the both end flow passages and has an intermediate flow passage in which a valve is interposed, respectively, and has a large viscosity in the initial stage of the movement process of the piston in the cylinder. A seismic isolation damper characterized in that resistance is obtained, and the valve of the flow path is sequentially opened with the movement of the piston to reduce the viscous resistance.