JP2528589B2 - High damping system for damping structures with multi-linear damping coefficient - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a high damping property for a seismic control structure having a multi-linear damping coefficient for giving a high damping property to the response of a structure to a vibration external force such as an earthquake or wind and reducing the vibration. It relates to a damping device.

[0002]

2. Description of the Related Art The applicant has incorporated variable rigidity elements (seismic elements) in the form of braces, walls, etc. in the column beam structure of a structure.
The rigidity of the variable stiffness element itself or the connection state between the frame body and the variable stiffness element is made variable, and the characteristics of the vibration external force are analyzed by a computer against the vibration external force such as earthquake or wind, and the structure becomes non-resonant. We have developed various active damping systems, variable rigidity structures, etc., that change the rigidity of the vehicle to ensure the safety of the structure (for example, Japanese Laid-Open Patent Publication No. 62-268479).
JP-A-63-114770, JP-A-63-11477
No. 1).

Further, various active vibration control systems have been proposed in consideration of non-resonance and damping of a structure by using a hydraulic vibration control device having a variable damping coefficient. 2-209568-71).

Further, as a vibration control device that can be used in these active vibration control systems, for example, Japanese Patent Laid-Open No. 3-18660.
There is a No. 2 cylinder lock device. The basic principle of the cylinder lock device is to provide hydraulic chambers on both sides of both rod-shaped pistons in the cylinder body, and to close or flow the pressure oil in both hydraulic chambers by a switching valve to fix the pistons, or It is movable.

[0005]

A conventional active vibration control system incorporating a variable stiffness element focuses on the relationship between the predominant period of a seismic motion or the like and the natural frequency of a structure. On the other hand, by actively shifting the natural frequency of the structure, the resonance phenomenon is avoided and the response amount is reduced.

However, in the case of the active vibration control system, in addition to the control computer, the driving device and various sensors are used, so that various safety maintenance mechanisms are required in case of any abnormality. The control mechanism becomes complicated,
There may also be cost issues. Further, there may be a case where it takes time until a sufficient effect is exhibited due to a delay in control.

On the other hand, a damping device as a damper is installed in the column and beam frame, and the damping coefficient c (t / kine) of the damping device is set.
Is set to an appropriate value, a passive vibration control system that reduces building vibration is configured.In this case, depending on whether the target external force for vibration reduction is an earthquake or a wind external force, The value of the optimum damping coefficient c is different.

For example, the swaying of a structure due to wind is
Since it occurs frequently, especially in high-rise buildings, the natural period becomes long, and a large long-period sway tends to occur due to the wind, which causes seasickness. Since the first-order vibration mode of the structure is dominant in the swaying of the structure due to such wind, the response of the structure is reduced as the first-order damping constant increases. Also, the greater the rigidity of the structure (shorter period), the smaller the sway. On the other hand, when considering a comparatively large-scale earthquake as the target for vibration reduction, the optimum damping coefficient c is smaller than the optimum damping coefficient c for wind external force.
It will be a small value.

Further, when the damping coefficient c is constant for all vibration levels, there is a problem that a larger earthquake causes a force larger than the proof stress of the device in the damping device.

The high damping device for a vibration control structure having a multi-linear damping coefficient of the present invention enables passive vibration control which does not require a control system by a computer program or the like when properly installed in the structure. The optimum damping coefficient is given according to the magnitude of the wind-external force and seismic force that are frequently encountered, thereby providing a large vibration reduction effect, thereby providing a comfortable living space. , Damage to the equipment against seismic motion exceeding the capacity of the equipment,
The purpose is to prevent destruction.

[0011]

The high-damping device of the present invention is a cylinder type damper device installed in the column beam frame of a structure, like the cylinder lock device described above.
For example, the cylinder body is connected to a frame beam, and the piston rod coming in and out of the cylinder body is connected to a seismic element such as a brace or an earthquake resistant wall. When a vibration external force such as an earthquake is applied to the structure, the high damping device gives a resistance force according to the damping coefficient against the relative displacement between the frame and the seismic resistant element.
Damps the vibration of structures.

The connection relationship between the cylinder body and the rod with respect to the frame or the seismic resistant element may be the reverse of that described above, or may be installed between the seismic resistant elements in the frame to connect the seismic resistant elements together.

Further, the high damping device of the present invention functions both for the wind outside force having a large optimum damping coefficient for giving a large vibration reducing effect and for the earthquake motion where the optimum damping coefficient is usually smaller than that for the wind outside force. The capacity required by the device depends on the size of the structure and the number of the devices to be installed in the structure, but is a compact device, for example, a holding force of 10
It is assumed that the damping force is 0t and the damping force is 100t / kine or more for the wind force, and the holding force and the high damping coefficient are more than that. In addition, the damping coefficient is reduced so as not to increase the load on the device section for an earthquake that exceeds a predetermined level (for example, 25 kine level).

In order to realize such a condition, the high attenuation device of the first invention of the present application comprises the following components.

Cylinder body fixed to the frame or seismic element of a structure Piston moving in the cylinder body A frame or seismic element that moves in and out from one end of the cylinder body and faces the frame or seismic element to which the cylinder body is fixed Piston rods fixed to elements Hydraulic chambers formed on both sides of the piston Plural flow passages penetrating the piston to communicate the hydraulic chambers First pressure regulating valve and second pressure regulating valve provided in the flow passage And a relief valve (distributed in each direction from one of the hydraulic chambers to the other). An accumulator provided in a bypass connecting the hydraulic chambers so that only oil flowing from the accumulator to the hydraulic chambers flows. A pair of check valves are provided in parallel with each of the above check valves to eliminate the pressure buildup in the hydraulic chamber. Orifice.

By providing the first pressure regulating valve, the second pressure regulating valve and the relief valve in the flow passage formed in the piston, oil leakage to the outside of the cylinder is prevented and the sealing property for obtaining a high damping property is secured. It

The first pressure regulating valve is intended to define an optimum damping coefficient c _a for the wind external force, and is 100 t for example when the second pressure regulating valve and the relief valve are closed.
A damping coefficient such as / kine is given to the device.

The second pressure regulating valve is a kind of relief valve, and is intended to define an optimum damping coefficient c _b (c _b <c _a ) against seismic motion, and when the hydraulic pressure of the device rises due to the seismic motion, By opening with the first hydraulic pressure, a damping coefficient such as 100 t / kine is given to the device together with the first pressure regulating valve.

The relief valve is intended to open when a force larger than the designed force is applied to the device to release the hydraulic pressure. It is opened by a predetermined second hydraulic pressure to reduce the damping coefficient of the device. , Free the device from the risk of destruction.

As the first pressure regulating valve and the second pressure regulating valve,
By using a poppet valve, a damping characteristic that does not depend on temperature is realized by making the fluid resistance a turbulent state.

The accumulator is mainly for preventing looseness due to air bubbles generated at the time of negative pressure and for responding to expansion and contraction of oil due to temperature change (including fire), thereby ensuring stability and safety. .

The orifice provided in parallel with the check valve eliminates the pressure buildup in the hydraulic chamber during repeated relative displacement (vibration) of the cylinder body and the rod during an earthquake, etc. Is provided for the purpose of linearizing.

The high damping device according to the second invention of the present application is the same as the high damping device according to the first invention, but instead of providing the first pressure regulating valve and the second pressure regulating valve, a single pressure regulating valve is used for adjusting the hydraulic pressure. Te, which was to provide the optimum damping coefficient c _a relative Kazegairyoku optimum damping coefficient for ground motion c _b a (c _b <c _a), for example, the attenuation coefficient in the first hydraulic described above the valve shape By changing the shape so that a is changed, the damping device is moved from c _a to c _b . When a force exceeding the design is applied to the device, the relief valve provided in parallel with the pressure regulating valve opens, and like the case of the high damping device of the first invention,
Relieves pressure and prevents damage to equipment.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the basic structure of a high damping device 10 according to the present invention, in which a double rod type piston 12 is incorporated in a cylinder 11.

As conditions for ensuring high damping and high rigidity, first, a hydraulic chamber on the side opposite to the moving direction of the piston 12 (in the figure, the left hydraulic chamber is shown as 14a and the right hydraulic chamber is shown as 14b). Is not required to be a negative pressure. Therefore, the first pressure regulating valves 17a and 17b are provided in the flow path penetrating the piston 12 so that the moving oil amount directly flows to the hydraulic chamber on the opposite side.

The second pressure regulating valves 27a and 27b and the relief valve 29a are arranged in parallel with the first pressure regulating valves 17a and 17b.
29b is provided, the second pressure regulating valves 27a, 27b open at the first hydraulic pressure corresponding to the earthquake motion, and the relief valves 29a, 29b open at the second hydraulic pressure assuming an earthquake of a predetermined level or higher.

FIG. 1B shows the first pressure regulating valves 17a and 17b and the second pressure regulating valves 27a and 27 in the cross section of the piston 12.
b and relief valves 29a, 29b are shown as an example of arrangement, and 12 flow passages that penetrate the piston 12 are formed, and bidirectional first pressure regulating valves 17a, 17b, second pressure regulating valves 27a,
27b and relief valves 29a and 29b are evenly arranged.

FIG. 2 schematically shows the high damping device 10 as a whole. However, in the case of FIG. 2, the piston rod protrudes from the cylinder 11 only in one direction, and the rods 12a on the protruding side and the opposite side of the cylinder 11 are attached to the seismic elements or the column beam frame to attach the mounting portions 15 and 16 to each other.
Is provided.

Further, in the high damping device 10 of the present invention, it is necessary to compensate for the insufficient oil amount in consideration of the compression of the operating oil. Therefore, the accumulator 18 for replenishment is required, and the bypass 19 is checked. Valves 20a and 20b are provided. Further stopping causes the oil to return to its original state (expansion), so it is necessary to return the compensated oil to the accumulator 18, and orifices (throttles) 21a and 21b are provided in parallel with the check valves 20a and 20b.

FIG. 3 shows a specific embodiment of the high damping device 10 of the present invention, the basic structure of which is as described above, and a seal for preventing oil leakage to the outside and achieving high damping. The first pressure regulating valves 17a and 17b are installed in the piston 12 for the purpose of ensuring the performance. Although not shown in FIG. 3, the second pressure regulating valves 27a and 27b and the relief valves 29a and 29b described above are also installed in the piston 12. Note that the accumulator 18 portion is omitted in FIG.

In addition, in this embodiment, in order to improve durability and reliability, a multistage metal seal is used for the piston seal 39a, and the fixed seal is also the metal seal 39b.
Further, regarding maintenance, a fluororesin seal 39c is provided in two stages on the rod portion, and the outer seal 39c can be replaced with a cartridge type. As described above, by increasing the sealing performance and accuracy of each part, a high damping coefficient can be achieved.

The mounting portion 15 is a clevis that can freely rotate in three directions.

FIG. 4 shows a conical poppet valve used as the first pressure regulating valve 17, and it is possible to realize a damping characteristic that does not depend on temperature by making the fluid resistance a turbulent flow state. The first pressure regulating valve 17 is a proportional valve in which a slit 25 as shown in the figure is formed in the valve body, and as the valve body is pushed down against the spring 26 by hydraulic pressure, the opening area at the slit 25 position increases, the provision of slit-shaped, the relationship between the load and speed in the device portion becomes linear, to maintain optimum damping coefficient c _a relative wind load.

The second pressure regulating valve 27 can have the same structure, but in that case, a prestress on the compression side is introduced into a member corresponding to the spring 26 in FIG. 4 and a predetermined first hydraulic pressure is applied. By allowing the valve to operate and defining the slit shape, it is possible to maintain the optimum damping coefficient c _b for the seismic load together with the first pressure regulating valve 17.

FIG. 5 shows an example of the relief valve 29, and reference numeral 30 in the figure is an opening pressure setting spring. The relief valve 29 has a structure in which when the earthquake exceeds a predetermined level and the pressure in the inflow portion on the entire surface of the valve reaches a pressure higher than the design pressure, the valve opens against the resistance of the spring 30 and releases the pressure. The operating principle of the valve is the same as the operating principle of the second pressure regulating valve 27 described above.

Next, as an application example of the high damping device 10 of the present invention, a method of designing a high damping structure for a steel frame structure building will be described.

FIG. 6 conceptually shows a high-rise building 1 using the high damping device of the present invention, in which a brace 4 as a seismic resistant element is locally provided in a column-beam structure including columns 2, beams 3 and the like. The damping device 10 is installed to absorb the vibration energy of the building at that portion. FIG. 7 shows an example of how the inverted V-shaped brace 4 and the damping device 10 are housed in one column beam frame.

FIG. 8 shows one layer as a vibration model. In the figure, c is the damping coefficient of the device, k _f is the rigidity of the column beam frame, k _b is the rigidity of the brace, and m is the mass of one layer. Is.

By performing complex eigenvalue analysis by changing the damping coefficient c to various values for the structure provided with the high damping device 10 as described above, the complex eigenvalue λ of the structure according to each damping coefficient c. _i is obtained.

From this complex eigenvalue, first, h _i = −Re (λ _i ) / | λ _i │ ... (1) (where λ _i is the complex eigenvalue giving the i-th vibration mode of the structure, Re (λ _i ) Is the damping coefficient c _i which gives the maximum value of the _i- th order damping constant h _i for the i-th order vibration mode of the structure, which is obtained by its real part), and T ₁ = 2π / Imag (λ ₁ ) ... (2) (where Imag (λ ₁ ) is an imaginary part of the complex eigenvalue λ ₁ ) and the first-order natural period T ₁ is shortened to find a damping coefficient c _T that gives a substantially stable value.

More specifically, the damping coefficient c ₁ which gives the maximum value of the first-order damping constant h ₁ , the damping coefficient c ₂ which gives the maximum value of the second-order damping constant h ₂ , and the maximum value of the third-order damping constant h ₃ The damping coefficients c ₃ and c _T that give the above are obtained. For the first vibration level whose damping characteristic is (a) mainly corresponding to frequent wind vibrations, c ₁ <c <c _T (3) (b) ) A vibration level that is higher than the first vibration level and is mainly the second vibration level that corresponds to a relatively large-scale earthquake motion (when considering the high damping device 10, a state in which a hydraulic pressure equal to or higher than the first hydraulic pressure described above is generated in the device) _{for, c 3 <c <c 1} ... (4) (c) a second vibration level is greater than the vibration level, a third vibration predetermined design load F _y or more damping force in the high damping device 10 occurs Level (when considering the high damping device 10, a hydraulic pressure equal to or higher than the second hydraulic pressure described above in the device) For resulting state), the c <c ₃ ... (5) and the first pressure regulating valve 17 of the high-damping device 10 so that the second pressure regulating valve 27, and setting of the relief valve 29.

FIG. 9 collectively shows the eigenvalue analysis results.

First, looking at the relationship between the damping coefficient c and the first-order damping constant h ₁ and the first-order natural period T ₁ , the first-order damping constant h
₁ gradually increases as the damping coefficient c increases, reaches a peak at a certain damping coefficient c ₁ , and then decreases. on the other hand,
The first-order natural period T ₁ stabilizes in a long period when the damping coefficient c is small, transitions to a short period near a certain damping coefficient, and then stabilizes in a short period. The damping coefficient when this first-order natural period T ₁ becomes short and becomes almost stable is c _T.

The sway of the structure due to the wind is the first-order damping constant h
_The larger ₁ is, the lower the response of the structure is, and the larger the rigidity of the structure is (the shorter the cycle is), the smaller the sway is. Therefore, there is a characteristic that the first vibration level mainly corresponds to the frequent wind vibration. In the range, by setting the damping coefficient c so that c ₁ <c <c _T (3), the optimum damping effect can be obtained as the wind response control.

That is, when the damping coefficient c is less than or equal to c ₁ , as the value thereof becomes smaller, the damping property of the structure sharply decreases, and the primary natural period T ₁ becomes long, so that the fluctuation also becomes large. Further, as a damping device, it is difficult to set the damping coefficient c to be greater than or equal to c _T, and even if it is possible, the cost of the device increases and the damping property of the structure gradually decreases. Get smaller.

Further, it is preferable that the damping coefficient c be close to c _T where the first-order natural period T ₁ is relatively stable. In FIG. 4, a more preferable range is c _T1 <c <c _T The range a that is (3 ') is given.

Next, with respect to the second vibration level which is larger than the first vibration level and mainly causes seismic motion, the damping coefficient h ₁ , h ₂ , h _{3 of} each order is in the range b showing 10 to 40%, If the damping coefficient c is set, a large response reduction effect with respect to earthquake motion can be obtained. As the range b, a peak between the third-order damping constant h _{3 and} the peak of the first-order damping constant h ₁ is suitable. That is, the damping constant h for the third mode
_The damping coefficient c ₃ which gives the maximum value of ₃ and the damping coefficient c ₁ which gives the maximum value of the damping constant h ₁ for the first-order mode are obtained, and the damping coefficient c of the high damping device is c ₃ <c <c ₁ Set it so that (4).

When the damping coefficient c is smaller than c ₃ , the damping constants h ₁ , h ₂ and h _{3 of} each order decrease sharply, and when the damping coefficient c is larger than c ₁ , the damping constant gradually decreases and
As shown for the first-order natural period T ₁ , the natural period of the structure tends to be short, the structure tends to resonate with seismic motion, and the deformation of the frame tends to increase.

FIG. 10 shows the response reduction effect in the seismic response spectrum. The solid line is the case of a normal building without the high damping device 10 (damping constant h≈2%),
The broken line shows the case where the damping coefficient c of the high damping device 10 is set in the range of b (damping constant h≈10 to 40%). As shown in the figure, the seismic response tends to decrease as the period increases.

The above is the analysis by defining the damping coefficient c of the high damping device 10, but in the present invention, the allowable yield strength of the high damping device 10 is also taken into consideration. That is, the load acting on the device is substantially proportional to the speed of the earthquake, and when the damping coefficient c is constant, the load acting on the device increases in accordance with the level of the earthquake. On the other hand, an earthquake of a predetermined level or more (for example, 2
5kine level) as the third vibration level, damping coefficient c
However, it is possible to prevent the high-damping device 10 from being broken by reducing so that c <c ₃ (5). Therefore, in the present invention, the relief valve 29 is operated to reduce the damping coefficient c by operating the relief valve 29 against a load equal to or higher than the design load, thereby ensuring reliability in terms of device protection. There is.

FIG. 11 shows the characteristics of the high damping device 10 of the present invention when the damping coefficient is set according to each vibration level described above.

That is, up to the damping force F _c (first vibration level) generated during frequent wind vibrations, c = c _a (c _T1 <
c _a <c _T ) and the damping force beyond that at the time of the earthquake (second vibration level) is c = c _b (c ₃ <c _b <c ₁ ).
Change to. In addition, in order to protect the device and simplify the design, when a force equal to or greater than the design load F _y is generated (third vibration level), the damping coefficient c is further reduced.

FIG. 12 shows the characteristics of FIG. 11 with the first pressure regulating valve 17,
The relationship between the second pressure regulating valve 27 and the relief valve 29 is shown. (A) A first damping coefficient c _a (c ₁ <c _a <c _T ) that gives _a predetermined damping coefficient in the range of the first vibration level Regulator valve 1
7 in parallel with (b) by the first hydraulic pressure corresponding to the damping force F _c generated in the range of the first vibration level, and together with the first pressure regulating valve 17, a predetermined damping coefficient c _b (c ₃ <c _b <c
₁ ) is provided, and (c) a relief valve 29 that is opened by the second hydraulic pressure corresponding to the design load F _y to sufficiently reduce the damping coefficient c (minimize the flow path resistance) is provided. As a result, (d) the damping characteristic of the high damping device 10 becomes as shown in FIG. 7 (d).

The value of the damping coefficient c is set by designing the shapes of the first pressure regulating valve 17, the second pressure regulating valve 27 and the relief valve 29 (for the second relief valve 29, the flow passage resistance is made as small as possible). ), And the second pressure regulating valve 2
7. The operating pressure of the relief valve 29 is realized by designing the spring value of the spring that biases these valves in the closing direction.

FIG. 13 shows another embodiment of the high damping device 10 of the present invention. In the configuration of the high damping device 10 shown in FIG. 1, the first pressure regulating valves 17a, 17b and the second pressure regulating valve 27a are provided. , 27b, instead of providing one type of pressure regulating valve 3
1a and 31b, depending on the hydraulic pressure, the optimum damping coefficient c _a for the external wind force and the optimum damping coefficient c _b (c
_b <c _a ).

FIG. 14 is a pressure regulating valve 3 used in the embodiment of FIG.
1 is shown, and the basic principle is the same as the proportional valve having the slit 25 described in FIG.
In about the slit 32 formed in the vertical direction, and the second interval 34 to provide a damping coefficient c _b for the first segment 33 and the ground motion to provide a damping coefficient c _a relative Kazegairyoku, slits 32
The slope of the part is changed. With such a valve shape, one damping valve can provide two damping coefficients c _a and c _b according to the hydraulic pressure P on the front surface. Further, referring to FIG. 11, by the second hydraulic pressure corresponding to the design load F _y ,
The relief valve 29 is opened to reduce the damping coefficient c.

[0057]

EFFECTS OF THE INVENTION With a simple mechanism of a hydraulic cylinder type and a compact device, high damping performance is realized, and it is easy to apply it to a structure.

With the structure in which the pressure regulating valve and the relief valve are provided inside the piston, and by ensuring the sealing property, a device with high performance stability and reliability can be manufactured.

By using a poppet valve as the pressure regulating valve, it is possible to make a device with less performance fluctuation due to temperature change.

This is a device having a multi-linear linear damping coefficient, and it is possible to realize optimal damping coefficients depending on wind external force and seismic motion, and to effectively suppress the vibration of the structure.

By reducing the damping coefficient by the relief valve for a large earthquake of a predetermined level or more, the load acting on the device can be reduced, and the device can be protected.

Further, since the number of damping devices to be installed on each floor, such as a building, can be regulated and the device is not overloaded,
The design is easy, the labor around the mounting structure and other members can be reduced, and a compact fit can be achieved.

By applying the device of the present invention to a structure, a passive high-damping structure can be realized and a high damping effect can be obtained. As a result, shaking due to disturbances such as earthquakes and winds can be significantly reduced, the structural safety of the building can be improved, and a comfortable living space can be provided.

Since it provides a passive vibration control mechanism, it only requires design and adjustment according to the characteristics of the structure at the time of installation, does not require a complicated control system or incidental equipment, and is active. It can be installed at a lower cost than the type vibration control mechanism.

[Brief description of drawings]

FIG. 1 shows a basic structure of a high damping device of the present invention, (a) is a vertical sectional view, and (b) is an AA sectional view thereof.

FIG. 2 is a model diagram showing an outline of the entire high damping device of the present invention.

FIG. 3 is a cross-sectional view showing an embodiment of the high damping device of the present invention.

FIG. 4 shows an example of a first pressure regulating valve, (a) is a front view and (b) is a side view (partial cross section).

FIG. 5 is a sectional view showing an example of a relief valve.

FIG. 6 is an elevational view conceptually showing a high damping structure according to the present invention.

FIG. 7 is an elevational view showing an example of the arrangement of high damping devices and braces as seismic resistant elements in a column / beam frame.

FIG. 8 is a vibration model diagram of one layer of a structure to which the present invention is applied.

FIG. 9 is a graph summarizing the relationship between the damping coefficient c and the _{first to} third order damping constants h ₁ , h ₂ and h ₃ and the first order natural period T ₁ of the frame obtained by the complex eigenvalue analysis. is there.

FIG. 10 is a graph showing a response reduction effect viewed from an earthquake response spectrum.

FIG. 11 is a graph schematically showing a damping characteristic relating to a damping coefficient provided by the high damping device of the present invention.

FIG. 12 is a graph for explaining a damping coefficient setting method in the high damping device of the first invention of the present application.

13A and 13B show a basic structure of a high damping device according to a second invention of the present application, in which FIG. 13A is a vertical sectional view and FIG. 13B is a sectional view taken along line BB thereof.

FIG. 14 is a schematic cross-sectional view showing an example of a pressure regulating valve used in the high damping device of the second invention of the present application.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... High damping structure, 2 ... Column, 3 ... Beam, 4 ... Brace, 1
0: high damping device, 11: cylinder, 12: piston,
14 ... Hydraulic chamber, 15, 16 ... Attachment part, 17 ... First pressure regulating valve, 18 ... Accumulator, 19 ... Bypass, 20 ...
Check valve, 21 ... Orifice, 25 ... Slit, 26
... Spring, 27 ... Second pressure regulating valve, 29 ... Relief valve,
30 ... Spring, 31 ... Pressure regulating valve, 32 ... Slit, 3
3 ... 1st section, 34 ... 2nd section, 35 ... Spring, 3
9a ... Piston seal, 39b ... Metal seal, 39c ...
Fluororesin seal

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Motoichi Takahashi 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Haruhiko Kurino 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Takeji Kurume 1-12-1, Asamizodai, Sagamihara City, Kanagawa Prefecture Kayaba Industry Co., Ltd. Sagami Factory (72) Inventor, Kunio Furukawa 1-12-1 Asamizodai, Sagamihara City, Kanagawa Prefecture Kayaba Industry Co., Ltd. Sagami Factory

Claims (2)

(57) [Claims] 1. A cylinder body, a piston that moves in the cylinder body, a piston rod that moves in and out from one end of the cylinder body, hydraulic chambers formed on both sides of the piston, and the piston penetrating the piston. A plurality of flow paths communicating the two hydraulic chambers, an accumulator provided in a bypass connecting the both hydraulic chambers, and a hydraulic chamber provided between each of the hydraulic chambers of the bypass and the accumulator, A pair of check valves for preventing the outflow of oil, and an orifice provided in parallel with each of the check valves in the bypass, in the plurality of flow passages penetrating the piston, the both hydraulic chambers A first pressure regulating valve in each direction from one side to the other, a second pressure regulating valve in each direction, and a relief valve in each direction are arranged in parallel in a distributed manner,
The first pressure regulating valve provides a predetermined damping coefficient ca in _a state where the second pressure regulating valve and the relief valve are closed, the second pressure regulating valve opens by a predetermined first hydraulic pressure, and the first regulating pressure valve And a predetermined damping coefficient c _b (c _b <c _a ),
The relief valve has a predetermined second pressure greater than the first hydraulic pressure.
A high damping device for seismic control structures with a multi-linear linear damping coefficient, which is set to open by the hydraulic pressure of the device to reduce the damping coefficient of the device. 2. A cylinder body, a piston that moves in the cylinder body, piston rods that move in and out from one end of the cylinder body, hydraulic chambers formed on both sides of the piston, and the piston penetrating the piston. A plurality of flow paths communicating the two hydraulic chambers, an accumulator provided in a bypass connecting the both hydraulic chambers, and a hydraulic chamber provided between each of the hydraulic chambers of the bypass and the accumulator, A pair of check valves for preventing the outflow of oil, and an orifice provided in parallel with each of the check valves in the bypass, in the plurality of flow passages penetrating the piston, the both hydraulic chambers A pressure regulating valve in each direction from one side to the other side and a relief valve in each direction are dispersedly arranged in parallel, and the pressure regulating valve has a predetermined pressure in a state where the relief valve is closed. Up to the first hydraulic pressure, a predetermined damping coefficient c _a is given, and from the first hydraulic pressure to a predetermined second hydraulic pressure higher than the first hydraulic pressure, a predetermined damping coefficient c _b (c
_b <c _a ), the relief valve is opened by the second hydraulic pressure, and the damping coefficient of the device is set to be reduced. A high damping device for damping structure having a multi-linear damping coefficient is characterized. .