JP2017089277A - Rubber plate cushioning mechanism, and air levitation-type base isolation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber plate cushioning mechanism and an air levitation-type base isolation device, the cushioning mechanism being small in displacement and offering high braking performance, and the base isolation system absorbing impact on an upper foundation even when a lower foundation slides at a time of earthquake, thereby suppressing positional deviation of a building.SOLUTION: An air levitation-type base isolation device includes: a lower foundation 4 and an upper foundation 6; a metallic seal plate 22 having an upper end fixed air-tightly to the upper foundation 6 and a bottom end contacting the lower foundation 4 elastically, to form an air pressure chamber 30; an air supply unit provided with a pressurized air tank and supplying compressed air to the air pressure chamber 30 when having detected a quake of an earthquake; a storage part installed on top of the upper foundation 6, housing the air supply unit inside, and having a building mounted on a top thereof; and a rubber plate cushioning mechanism 46 provided either on the lower foundation 4 or the upper foundation 6 and including a rubber plate 44 and a covered protruded shaft 45, the rubber plate comprising an annular high-damping rubber having an opening at a center, having different plate thicknesses on an inner peripheral side and an outer peripheral side, and having top and bottom surfaces inclined toward the inner peripheral side or the outer peripheral side, and the protruded shaft being inserted into the opening at the center.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a rubber plate cushioning mechanism and an air levitation type seismic isolation device. More specifically, the present invention includes an annular rubber plate cushioning mechanism made of high-attenuation rubber and having both an upper surface and a lower surface inclined, and the rubber plate cushioning mechanism It relates to an air levitation type seismic isolation device.

  In order to prevent a building from shaking due to an earthquake, there is an air levitation type seismic isolation device (see Patent Document 1) that levitates a building with air. According to this, since air is inject | poured between an upper foundation and a lower foundation and an upper foundation and a building are levitated, the vibration of an earthquake can be interrupted | blocked effectively. There is also a misalignment repair device (see Patent Document 2). According to this, the tire is attached to the support bar installed on the lower foundation, and the tire is sandwiched between the upper foundation, so even if the support bar on the lower foundation moves from its original position in the earthquake, air is injected into the tire after the earthquake. By doing so, the position of the upper foundation and the building can be corrected by air pressure.

  Patent Documents 1 and 2 are also applied, and there are the following problems as an air levitation type seismic isolation device for a building. In the event of an earthquake, air is injected between the upper foundation and the lower foundation, and the upper foundation floats, so that the shaking of the lower foundation is not transmitted directly to the upper foundation. However, since (a) the positional relationship between the upper foundation and the lower foundation is shifted, it is necessary to restore the positional shift with air pressure by putting air into the tire of the “misalignment repair device” after the earthquake. Since this takes time, a buffering mechanism that can suppress the displacement of the building to be small is desired. (B) Further, a buffer mechanism with a simple structure is desired.

Utility Model Registration No. 3119675 JP 2008-208696 A

  An object of the present invention is to provide a rubber plate cushioning mechanism that has a small displacement and good braking performance, and absorbs an impact applied to the upper foundation even when the lower foundation slides in the event of an earthquake, thereby shifting the position of the building. The object is to provide an air levitation type seismic isolation device that can be suppressed to a small size.

  The rubber plate cushioning mechanism according to the present invention is composed of an annular high-attenuation rubber having a central opening, the plate thickness is different on the inner peripheral side and the outer peripheral side, and both the upper surface and the lower surface are inclined toward the inner peripheral side or the outer peripheral side. It consists of a rubber plate and a protruding shaft provided so as to be inserted into the central opening.

  A plurality of the rubber plates are used by being stacked on the protruding shaft.

  An air levitation type seismic isolation device according to the present invention includes a lower foundation, an upper foundation installed on the lower foundation, an upper end airtightly fixed to the upper foundation, and a lower end elastically contacting the lower foundation. It is equipped with a metal seal plate that forms an air pressure chamber and a pressurized air tank. When a sensor detects a shake of an earthquake, the valve is opened and compressed air is supplied to the air pressure chamber surrounded by the metal seal plate. An air supply unit for levitating the upper base, a storage unit installed at an upper part of the upper base, in which the air supply unit is stored and a building is placed, and the lower base or the upper base A rubber plate that is provided on one of the two sides and is made of an annular high-attenuation rubber having a central opening, the plate thickness is different on the inner peripheral side and the outer peripheral side, and the upper surface and the lower surface are both inclined toward the inner peripheral side or the outer peripheral side. , Provided on the other of the lower foundation or the upper foundation It is a protrusion shaft with a lid which is inserted into the central opening, and a rubber plate buffering mechanism consisting, characterized in that is provided.

  According to the rubber plate cushioning mechanism of the present invention, the rubber plate is made of an annular high-attenuation rubber having a central opening, and the upper surface and the lower surface are both inclined toward the inner peripheral side or the outer peripheral side. The displacement is large and the displacement can be reduced with a large load. It does not change in proportion to the load like a spring. Since the rubber plate is annular and the upper and lower surfaces are both inclined toward the inner or outer peripheral side, the plate thickness is constant, a soft rubber layer is provided on the inner peripheral side, and a hard rubber layer is provided on the outer peripheral side It can be displaced in the same way as High-damping rubber has an energy-absorbing action, so it has a large damping effect and can effectively mitigate shocks caused by earthquakes.

  According to the air levitation type seismic isolation device of the present invention, the compressed air is supplied to the gap between the lower foundation and the upper foundation, and the upper foundation and the building are levitated. The influence of vibration on the building can be reduced. (2) Since the rubber plate cushioning mechanism is provided, for example, even if the lower foundation slides due to an earthquake, the impact can be absorbed and the upper foundation can be prevented from being greatly displaced. Since the upper foundation is not greatly displaced, the building will not be displaced greatly. (3) Since the protruding shaft is provided with a lid, the rubber plate cushioning mechanism can be fixed by bringing the lid into contact with the upper surface of the upper foundation when the protruding shaft is attached to the upper foundation. Can be prevented from leaking.

It is a perspective view of the rubber-plate buffer mechanism (configuration example 1) by this invention. It is a graph which shows the relationship with the load concerning the rubber plate which displaces a protrusion axis | shaft horizontally in FIG. 1 and is pressed by a protrusion axis | shaft. It is sectional drawing when the rubber plate of FIG. 1 is used in multiple numbers. It is a perspective view of the rubber-plate buffer mechanism (configuration example 2) by this invention. FIG. 5 is a cross-sectional view when a plurality of rubber plates of FIG. 4 are used. 1 is a front view of an air levitation type seismic isolation device according to the present invention. It is an attachment figure (example 1) of a rubber plate buffer mechanism. It is a perspective view of the protrusion shaft of a rubber plate buffer mechanism. It is VV sectional drawing of FIG. It is an attachment figure (example 2) of a rubber plate buffer mechanism. It is an attachment figure (example 3) of a rubber plate buffer mechanism.

  Hereinafter, a rubber plate cushioning mechanism and an air levitation type seismic isolation device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a rubber plate cushioning mechanism 46 (configuration example 1) according to the present invention. The rubber plate buffer mechanism 46 of the configuration example 1 includes a rubber plate 44 made of an annular high damping rubber and a steel protruding shaft 45. The rubber plate 44 has a circular central opening 43 at the center. As shown in the lower right cross-sectional view of FIG. 1, the outer peripheral side is thicker than the inner peripheral side. The rubber plate 44 has an inclined surface 47 that is inclined so that both the upper surface and the lower surface are lowered toward the inner peripheral side. The protruding shaft 45 is provided so as to be inserted into the central opening 43. The diameter of the central opening 43 is larger than the diameter of the protruding shaft 45, and the length of the gap is about 30 to 70 cm on one side. The high-damping rubber is obtained by blending rubber with a 14-group silica or carbon of the periodic table and a resin, whereby the damping action can be remarkably improved. Known as seismic isolation rubber.

  FIG. 2 is a graph showing the relationship between the load applied to the rubber plate pressed horizontally by the protrusion shaft in FIG. The rubber plate 44 is assumed to be fixed on the outside. Further, it is assumed that the protruding shaft 45 is at the center of the central opening 43. When the protruding shaft 45 is displaced in the right direction (+), when the protruding shaft 45 is in the gap of the central opening 43, the load applied to the rubber plate is zero. After the protruding shaft 45 comes into contact with the inner periphery of the rubber plate 44, the rubber plate 44 on the inner peripheral side is thin, so that it is displaced even with a small load. When the protruding shaft 45 is further pushed, since the rubber plate 44 is thick, a large load is applied to suppress the displacement. Due to such a structure, when an impact is applied to the rubber plate 44 by the protruding shaft 45, the central opening 43 of the rubber plate 44 is contracted to absorb the impact. The relationship between the load and displacement when the protruding shaft 45 is displaced in the left direction (-) is also shown in the graph of FIG.

  FIG. 3 is a cross-sectional view when a plurality of rubber plates 44 of FIG. 1 are used. As an example, if the rubber plate 44 is composed of three pieces, even if the same load is applied to the protruding shaft, only one third of the load is applied to the single rubber plate 44, so that the displacement can be reduced. Such a configuration can be applied to a case where a large number of rubber plates 44 cannot be installed on a horizontal plane and the displacement is to be kept small.

  FIG. 4 is a perspective view of the rubber plate cushioning mechanism 46 (configuration example 2) according to the present invention. The rubber plate buffer mechanism 46 of the configuration example 2 includes an annular rubber plate 44 and a steel protruding shaft 45. The rubber plate 44 is circular, and the protruding shaft 45 is attached to the central opening 43 without a gap. As shown in the lower right sectional view of FIG. 4, the plate thickness on the outer peripheral side is thinner than the inner peripheral side. The rubber plate 44 has an inclined surface 47 that is inclined so that both the upper surface and the lower surface are lowered toward the outer peripheral side. A wall is provided outside the rubber plate 44, and the length of the gap between the wall and the rubber plate 44 is about 30 to 70 cm on one side.

  FIG. 5 is a cross-sectional view when a plurality of rubber plates 44 of FIG. 4 are used. As an example, a case where the rubber plate 44 is composed of three sheets is shown. Comparing the rubber plate 44 of the configuration example 1 and the rubber plate 44 of the configuration example 2, the configuration example 2 requires less material than the configuration example 1. This is because, in the configuration example 1, the rubber plate 44 must be enlarged by the size of the central opening 43 when the lengths of the rubber portions in the radial direction are the same.

  FIG. 6 is a front view of an air levitation type seismic isolation device 100 according to the present invention. The air levitation type seismic isolation device 100 includes a lower foundation 4, an upper foundation 6 installed on the lower foundation 4, an air supply unit 8, a metal seal plate 22, a storage portion 52 of the air supply unit 8, It is comprised including. In this embodiment, the metal seal plate 22 is hermetically fixed to the entire side surface of the upper base 6 and its lower end elastically contacts the lower base 4. Not limited to this, the upper base 6 may be divided into a plurality of parts, and the periphery thereof may be surrounded by the metal seal plate 22. According to this, even if the weight of the building is uneven, it can be balanced and floated horizontally. In the building 58, the bottom 54 of the building is assembled on the storage unit 52. The storage portion 52 has a solid structure provided with support legs made of H steel 56. The building 58 includes a rubber plate buffer mechanism 46. Details will be described in FIGS. The building 58 has a weight of about 20 tons in a wooden building, for example. When the floor area is 20 tsubo, dividing by 60 (= 3.3 square meters × 20) is about 300 kgf / m 2. If the weight of the building is 30 tons, the pressure is about 500 kgf / m2.

  The lower foundation 4 is rectangular and can be formed of concrete. The lower base 4 has a smooth surface portion 12 on the upper surface with which the metal seal plate 22 contacts. In the event of an earthquake, even if the lower foundation 4 slides due to vibration, the metal seal plate 22 prevents a large amount of air from leaking from the bottom. The smooth surface portion 12 may have a predetermined width, for example, 60 cm to 120 cm, as the entire upper surface of the lower base 4. The smooth surface portion 12 can be realized by polishing with an engine-type rotary rod. It may be covered with a stainless steel metal plate, or a resin plate may be employed. The smooth surface portion 12 is preferably within ± 1 mm when the smoothness is indicated by the maximum height difference of the unevenness. The lower foundation 4 is made higher than the ground so that no dust or rainwater enters.

  As shown in FIG. 6, in this embodiment, a metal seal plate 22 is attached to the side surface of the upper base 6. The metal seal plate 22 seals the air in the air pressure chamber 30 so as not to leak. An upper end of the metal seal plate 22 is fixed to the upper base 6 with a bolt 20 and is inserted into the notch groove 18. The metal sealing plate 22 is bent and elastic force is applied, and the lower end abuts on the smooth surface portion 12. The metal seal plate 22 is preferably a stainless steel plate in terms of elasticity, strength, and corrosion resistance. For example, the metal seal plate 22 having a length of 1 to 3 m, a width of 15 to 25 cm, and a thickness of 0.15 to 0.6 mm can be used.

  As shown in FIG. 6, a storage portion 52 is provided on the upper base 6. The air supply unit 8 is accommodated here. A building 58 is constructed on the storage unit 52. The air supply unit 8 includes an air supply pipe 24, a pressurized air tank 26, a valve 28, an acceleration sensor 32, a height sensor 33, a control unit 34, and the like. Since the air supply unit 8 is stored in the storage portion 52, the air supply pipe 24 does not vibrate in the event of an earthquake, and displacement and damage of the piping can be prevented. In addition, since a water and sewage pipe etc. are connected to the exterior of a building, a flexible pipe is used. The air supply pipe 24 is penetrated from the upper surface to the lower surface of the upper base 6. The inner diameter is 15-30 mm. The compressed air in the pressurized air tank 26 is sent to the air pressure chamber 30 between the lower foundation 4 and the upper foundation 6. The upper foundation 6 is levitated by the pressure of the compressed air. That is, since the shaking of the lower foundation 4 is blocked by air, a seismic effect is exhibited.

  When an earthquake occurs, the acceleration sensor 32 informs the control unit 34 when it detects an initial tremor that is a shaking of the earthquake. The control unit 34 detects the predetermined swing width and opens the valve 28. For example, the valve 28 is opened by shaking with a seismic intensity of 3. Thereby, compressed air is sent into the air pressure chamber 30 through the air supply pipe 24 in about 2 seconds, and the upper foundation 6 is levitated. Note that compressed air may be fed into the air pressure chamber 30 at an early stage of the earthquake. The pressure in the air pressure chamber 30 is about 300 to 500 kgf / m 2, for example, depending on the weight of the building 58. For example, the control unit 34 closes the valve 28 when the height sensor 33 detects the predetermined height of the upper base 6. Since air leaks slightly from the air pressure chamber 30, when the earthquake continues for a long time, the valve 28 is opened again, and compressed air is supplied to the air pressure chamber 30. Reference symbol Y denotes the height of the air pressure chamber. In the event of an earthquake, the height is increased to 3 to 5 cm by injection of compressed air.

  FIG. 7 is an attachment diagram (example 1) of the rubber plate cushioning mechanism 46 provided in the air levitation type seismic isolation device 100. In FIG. 7, it is assumed that the upper base 6 is in a state of being floated by compressed air. The rubber plate 44 is provided in the groove 42 of the lower base 4. The rubber plate 44 has an annular and circular central opening 43, the outer peripheral side is thicker than the inner peripheral side, and the upper surface and the lower surface are both inclined. On the other hand, the protruding shaft 45 is inserted and attached to the through hole 40 of the upper base 6, and the lower end portion is inserted into the central opening 43. A lid 48 is integrally provided on the protruding shaft 45. The lid 48 is attached to the upper portion of the upper base 6 so that the air pressure chamber 30 is airtight with the bolt 50. However, the present invention is not limited thereto, and the protruding shaft 45 may be attached to the lower base 4 and the rubber plate 44 may be attached to the upper base 6.

  It is assumed that an earthquake is detected and the upper foundation 6 rises with compressed air injected into the air pressure chamber 30. Assume that the lower foundation 4 vibrates left and right in this state. Even if the rubber plate 44 fixed to the lower foundation 4 moves left and right, the rubber plate 44 and the protruding shaft 45 do not interact in a range where the central opening of the rubber plate 44 does not contact the protruding shaft 45. Even if the rubber plate 44 moves further, the central opening of the rubber plate 44 contacts the protruding shaft 45 and deforms, so that the impact is alleviated. If the lower foundation 4 slides more than expected, the upper foundation 6 is slid through the protruding shaft 45. Even in that case, the impact is reduced and the building 58 moves slowly. The extent to which the lower foundation 4 slides can be inferred from actual seismic waves. Based on this, the size of the rubber plate 44 can be determined. Thus, after the earthquake is calmed down, the lower foundation 4 and the upper foundation 6 are in a predetermined range of positional relationship, so there is no need to repair the misalignment again.

  FIG. 8 is a perspective view of the protruding shaft 45 of the rubber plate cushioning mechanism 46 of FIG. The protruding shaft 45 is integrally fixed to the lid 48 and can be fixed to the upper base 6 by inserting a bolt 50 into the mounting hole 41. When fixing the protruding shaft 45 to the lower foundation 4, the direction is reversed and the lid 48 is fixed to the recess of the lower foundation 4.

  9 is a cross-sectional view taken along the line VV in FIG. In this embodiment, four rubber plate buffer mechanisms 46 are provided. Air supply pipes 24 were provided at five locations. The dotted line is the metal seal plate 22. At the corner A, the vertical and horizontal metal seal plates 22 and 22 are overlapped with each other to prevent air leakage. A rubber sheet may be attached to the side portion of the stacked metal seal plate 22.

  FIG. 10 is an attachment diagram (example 2) of the rubber plate cushioning mechanism 46. FIG. 10 shows a case where a plurality of rubber plates 44 are provided in the groove 42 of the lower base 4. The protruding shaft 45 is inserted into and attached to the through hole 40 of the upper base 6, and a lid 48 is integrally provided on the protruding shaft 45.

  FIG. 11 is an attachment diagram (example 3) of the rubber plate cushioning mechanism 46. In FIG. 11, the protruding shaft 45 is provided in the groove 42 of the lower foundation 4. On the other hand, a plurality of rubber plates 44 are attached to the through holes 40 of the upper base 6.

  The rubber plate shock-absorbing mechanism of the present invention can provide an air levitation type seismic isolation device that can brake in any direction of 360 degrees and can be incorporated into the foundation of a building to suppress the displacement of the building to a small size in the event of a large earthquake.

4 Lower foundation 6 Upper foundation 8 Air supply unit 12 Smooth surface portion 18 Notched groove 20 Bolt 22 Metal seal plate 24 Air supply pipe 26 Pressurized air tank 28 Valve 30 Air pressure chamber 32 Acceleration sensor 33 Height sensor 34 Control unit 40 Through hole 41 Mounting hole 42 Groove 43 Central opening 44 Rubber plate 44a Soft rubber layer 44b Hard rubber layer 45 Projection shaft 46 Rubber plate cushioning mechanism 47 Inclined surface 48 Lid 50 Bolt 52 Storage portion 54 Bottom of building 56 H steel 58 Building 100 Air levitation type seismic isolation device A Corner B Straight line Y Height of air pressure chamber

Claims (3)

A rubber plate made of an annular high-attenuation rubber having a central opening, with different thicknesses on the inner peripheral side and outer peripheral side, and an upper surface and a lower surface both inclined toward the inner peripheral side or outer peripheral side, and the central opening A rubber plate cushioning mechanism comprising: a projecting shaft provided to be inserted.
The rubber plate cushioning mechanism according to claim 1, wherein a plurality of the rubber plates are used on the protruding shaft.
Under the foundation,
An upper foundation installed on the lower foundation;
A metal seal plate having an upper end hermetically fixed to the upper base and a lower end elastically contacting the lower base to form an air pressure chamber;
An air supply unit that includes a pressurized air tank and opens a valve to supply compressed air to the air pressure chamber surrounded by the metal seal plate to lift the upper foundation when a sensor detects a shake of an earthquake. ,
A storage unit installed at an upper part of the upper foundation, in which the air supply unit is stored, and a building is placed on the upper part;
It is provided on one of the lower foundation or the upper foundation and is made of an annular high-attenuation rubber having a central opening. The plate thickness differs between the inner peripheral side and the outer peripheral side, and the upper surface and the lower surface are both on the inner peripheral side or the outer peripheral side. A rubber plate cushioning mechanism comprising: a rubber plate inclined toward the bottom; and a protruding shaft with a lid provided on the other of the lower base and the upper base and inserted into the central opening. Air levitation type seismic isolation device.

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