JP2010185238A - Base-isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base-isolating device which is suitable for a free-access floor, which can be replaced with a floor panel in installation, and which is excellent in supportability of equipment etc. installed in an upper position, restorability against shaking, and a damping capacity. <P>SOLUTION: A sliding member 9 is arranged in the state of being sandwiched between lower and upper sliding plates 7 and 11. A surface (top surface) of contact of the lower sliding plate 7 with the sliding member 9 is a concavely-curved surface 23 (C represents the curvature of the curved surface), while an undersurface of the sliding member 9 contacting the concavely-curved surface 23 is a convexly-curved surface 27 (D represents the curvature of the curved surface). Similarly, a surface (undersurface) of contact of the upper sliding plate 11 with the sliding member 9 is a concavely-curved surface 21 (A represents the curvature of the curved surface), while a top surface of the sliding member 9 contacting the concavely-curved surface 21 is a convexly-curved surface 25 (B represents the curvature of the curved surface). In this case, the curvatures A and B coincide with each other, and also the curvatures C and D coincide with each other. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a seismic isolation device used for a free access floor.

  Conventionally, in order to obtain a seismic isolation function for equipment such as servers placed on a free access floor, the entire floor is made a seismic isolation structure, or a simple seismic isolation device is installed on the floor panel. The method to be taken is taken.

  However, the method of making the entire floor a seismic isolation structure increases the scale, which increases the cost of the seismic isolation structure and increases the construction period. On the other hand, when a simple seismic isolation device is installed on the floor panel, there is a problem that the floor panel itself falls or rises during an earthquake, and the vertical seismic isolation effect is particularly small. In addition, there is no seismic isolation device that can reliably isolate only the server portion by a simple method and is incorporated in a part of the free access floor.

  Conventionally, as a base isolation structure used for base isolation such as buildings, for example, rigid balls with a spherical diameter are arranged on the upper and lower bearing plates, and the vibration caused by the earthquake is caused by the resistance when the rigid balls in the bearing plate roll. There is a seismic isolation bearing that absorbs (see, for example, Patent Document 1).

JP 2002-266933 A

  However, the seismic isolation bearing described in Patent Document 1 absorbs vibration by rolling resistance of a rigid ball, but there is a limit to absorption of vibration energy by rolling resistance, and there is a problem that the damping capacity cannot be increased so much. Further, the rigid ball may jump out of the upper and lower bearing plates due to vibration.

  Further, since the installation of the rigid ball and the upper and lower bearing plates is a point contact, there is a problem that the rigid ball may be deformed or damaged unless the rigidity of the rigid ball is extremely high.

  In addition, since such a seismic isolation structure is not considered as a seismic isolation structure for a free access floor in the first place, even if it is installed on the floor panel, problems such as floating and falling of the floor panel cannot be solved. In addition, since the seismic isolation device is installed on the floor panel, there is a problem that the height of the seismic isolation device is increased and the device installed on the floor panel becomes unstable.

  The present invention has been made in view of such problems, and the object thereof is suitable for a free access floor, and can be installed in place of a floor panel, such as equipment installed above. The object of the present invention is to provide a seismic isolation device having excellent supportability, resilience to shaking, and damping ability.

  The present invention for achieving the above-described object is a seismic isolation device used for a free access floor, which is fixed on a support leg, has a sliding surface on the upper side, and can support the weight from above. Lower support structure, sliding member disposed on the sliding surface of the lower support structure, and disposed on the sliding member, having a sliding surface below and capable of supporting weight from above An upper support structure, and at least one of the sliding surface of the lower support structure and the sliding surface of the upper support structure is a concave curved surface having a certain curvature. The contact surface of the sliding member with the concave curved surface is a convex curved surface corresponding to the concave curved surface, and the sliding member is slidable on the concave curved surface. is there.

  The concave curved surface having a certain curvature means that the entire curved surface has the same curvature in three dimensions at any position, and means that it is composed of a part of a curved surface of a sphere having a predetermined diameter. To do. Further, the contact surface with the sliding member being a concave curved surface means that the contact surface is concave when viewed from the sliding member. Similarly, the contact surface of the sliding member being a convex curved surface corresponding to the concave curved surface has the same curvature as the concave curved surface (that is, a curved surface of a part of a sphere having the same diameter), and the upper and lower support structures. Means a convex shape in the direction of the contact surface with the sliding surface.

  The lower support structure includes a lower frame installed and fixed on a support leg, a lower mounting plate fixed on the lower frame, and a lower slide fixed on the lower mounting plate and having a sliding surface. A part of or all of the lower frame, the lower mounting plate, and the lower sliding plate may be integrally or separately formed. The upper support structure is disposed on the sliding member and has an upper sliding plate having a sliding surface, an upper mounting plate fixed on the upper sliding plate, and an upper mounting plate. A fixed upper frame; and an upper plate fixed on the upper frame, wherein the upper sliding plate, the upper mounting plate, the upper frame, and a part or all of the upper plate are integrated or separated. It may be formed of a body.

  The contact surface between the sliding surface of the lower support structure and the sliding member is a lower concave curved surface having a certain curvature, and the contact surface with the lower concave curved surface of the sliding member is the lower side A lower convex curved surface corresponding to the concave curved surface, a contact surface between the sliding surface of the upper support structure and the sliding member is an upper concave curved surface having a certain curvature, and the upper concave surface of the sliding member Preferably, the contact surface with the curved surface is an upper convex curved surface corresponding to the upper concave curved surface, and the sliding member is slidable with respect to each of the lower support structure and the upper support structure. In this case, the sliding surface of the lower support structure and the sliding surface of the upper support structure have substantially the same size, and the lower concave curved surface and the upper concave curved surface have substantially the same curvature. It is desirable.

  The height of the sliding member is smaller than the width of the sliding member, and the upper concave curved surface and the lower concave curved surface provided on the upper and lower surfaces of the sliding member have the same curvature, and the sliding member May be in surface contact with the sliding surface of the lower support structure and the sliding surface of the upper support structure, respectively.

  According to the seismic isolation device of the present invention, at least one of the sliding surfaces of the upper and lower support structures has a curved surface corresponding to the contact surface between the sliding member and the sliding member. Since the sliding surface comes into surface contact, the damping ability due to friction during sliding is high, and since the weight from above can be received by the surface, a high bearing force can be obtained. In addition, the center position of the sliding surface becomes the apex of the curved surface, and when receiving a force from above, the sliding member is stabilized at the center position (original position) of the sliding surface, so that a high restoring force can be obtained. it can. Further, if the upper and lower support structures are formed of a frame, a plate, a sliding plate, etc., manufacture and assembly are easy.

  In addition, since both the upper and lower sliding surfaces are slidable with respect to the sliding member, the relative displacement amount of the upper and lower support structures is about twice that of the case of only one, and more A large displacement capability can be obtained.

  Further, if both the upper and lower sliding surfaces have a predetermined curvature and are provided so as to sandwich the sliding member, higher restoring force and damping force can be obtained.

  In particular, if the curvature of the upper and lower sliding surfaces is the same, the curvature of the upper and lower surfaces of the sliding member can be made the same, so that the seismic isolation function can be obtained regardless of the vertical direction of the sliding member, A mistake in the installation direction can be prevented.

  According to the present invention, a seismic isolation device that is suitable for a free access floor and can be installed in place of a floor panel and has excellent supportability of equipment installed above, resilience to shaking, and damping capability. Can be provided.

1 is an exploded perspective view showing a seismic isolation device 1. It is a figure which shows the state by which the seismic isolation apparatus 1 was assembled, (a) is a front view, (b) is an enlarged view of the sliding member 9 vicinity. The figure which shows operation | movement of the seismic isolation apparatus. The figure which shows the installation method of the seismic isolation apparatus 1, and is the figure which shows the state which removed the floor panel 29. FIG. It is a figure which shows the state which installed the receiving members 33 and 35, (a) is a top view, (b) is the EE sectional view taken on the line of (a). FIG. 3A is an exploded perspective view of the fixing bracket 36, FIG. 2B is a side view illustrating a state in which the receiving member 33 is attached by the fixing bracket 36, and FIG. The front view which shows a state. It is a figure which shows the state which installed the lower flame | frame 3, (a) is a top view, (b) is the EE sectional view taken on the line of (a). The figure which shows the state which installed the lower attachment plate 5 and the lower sliding plate 7, (a) is a top view, (b) is the EE sectional view taken on the line of (a). It is a figure which shows the state which installed the sliding member 9, the upper sliding plate 11, the upper attachment plate 13, and the upper frame 15, (a) is a top view, (b) is the EE sectional view taken on the line of (a). It is a figure which shows the state which installed the upper plate 17, (a) is a top view, (b) is the EE sectional view taken on the line of (a). It is a figure which shows another Example, (a) is a figure which shows the seismic isolation apparatus 60, (b) is a figure which shows the seismic isolation apparatus 70.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a seismic isolation device 1 according to the present invention, and FIG. 2 is a view showing an assembled state. The seismic isolation device 1 mainly includes a lower frame 3, a lower mounting plate 5, a lower sliding plate 7, a sliding member 9, an upper sliding plate 11, an upper mounting plate 13, an upper frame 15, an upper plate 17, and the like. Is done. In the following description, unless otherwise specified, illustrations of bolts and nuts used for attaching each member are omitted.

  The lower frame 3 is a frame for ensuring the strength of the lower side of the seismic isolation device 1, and is formed by joining, for example, a square steel pipe or the like into a predetermined shape by welding or the like. The length of the lower frame 3 in the longitudinal direction is substantially the same as the length of one side of the floor panel for the free access floor to be installed. The lower frame 3 is installed on the support leg 19 as shown in FIG.

  A lower mounting plate 5 is provided on the lower frame 3 by bolts or the like not shown. The lower mounting plate 5 is a plate-like member that joins the lower sliding plate 7 and the lower frame 3 together. A hole 6 is provided in a part of the lower mounting plate 5. A part of the lower surface of the lower sliding plate 7 is exposed in the hole 6.

  A lower sliding plate 7 is installed on the lower mounting plate 5 by bolts or the like not shown. The lower sliding plate 7 is a plate-like member made of, for example, stainless steel having a curved surface that protrudes downward in the drawing (the upper surface is concave). The curved surface portion of the lower sliding plate 7 becomes the sliding range of the sliding member 9.

  The curved surface of the lower sliding plate 7 has a constant curvature in the sliding range. That is, the sliding range of the lower sliding plate 7 is a shape obtained by cutting out a part of the outer surface of a sphere having a predetermined diameter. Note that the size of the sliding range of the lower sliding plate 7 depends on the installation position, but may be, for example, 300 to 400 mm, and the radius of the curved surface may be, for example, about 2000 mm. The lower sliding plate 7 may be manufactured by any method such as pressing or cutting.

  A sliding member 9 is placed in the sliding range of the lower sliding plate 7. The sliding member 9 is made of, for example, a fluororesin. The lower surface of the sliding member 9 has a convex shape having the same curved surface as that of the lower sliding plate 7. That is, the concave curved surface of the lower sliding plate 7 and the convex surface of the sliding member 9 are in contact with each other.

  The sliding member 9 has, for example, a substantially cylindrical shape with a height of 50 mm and a diameter of 60 mm (upper and lower surfaces are convex curved surfaces). In order for the sliding member 9 to function stably, the height of the sliding member 9 is preferably lower than the outer diameter. The shape of the sliding member 9 is not limited to a cylindrical shape.

  An upper sliding plate 11 is installed on the sliding member 9. The upper sliding plate 11, the upper mounting plate 13, and the upper frame 15 are configured in such a manner that the lower sliding plate 7, the lower mounting plate 5, and the lower frame 3 are vertically opposite to the sliding member 9. is there. Therefore, detailed description is omitted.

  FIG. 2B is an enlarged view of the vicinity of the sliding member 9 in an assembled state. As described above, the sliding member 9 is sandwiched between the lower sliding plate 7 and the upper sliding plate 11 and is slidably disposed with respect to each other. The contact surface (upper surface) of the lower sliding plate 7 with the sliding member 9 is a concave curved surface 23 (the curvature of the curved surface is C), and the lower surface of the sliding member 9 in contact therewith is a convex curved surface 27 (the curvature of the curved surface is D).

  Similarly, the contact surface (lower surface) of the upper sliding plate 11 with the sliding member 9 is a concave curved surface 21 (the curvature of the curved surface is A), and the upper surface of the sliding member 9 in contact therewith is a convex curved surface 25 (curved surface). The curvature of is B). In this case, A and B match, and C and D match.

  Although it is desirable that the curvature A of the sliding range of the upper sliding plate 11 and the curvature C of the lower sliding plate are the same, the curvature may be changed. In this case, it is only necessary to change the curvature of the upper and lower surfaces of the sliding member 9 to have curved surfaces (convex curved surfaces) that match the curved surfaces of the upper and lower sliding plates.

  An upper plate 17 is provided on the upper frame 15. The upper plate 17 is a part that becomes a floor on which equipment and the like are actually installed. As shown in FIG. 1, a pair of connecting portions 18 are provided on opposite sides of the upper surface of the upper plate 17. The connecting portion 18 is a portion that is slightly thinner than other portions, and is provided along the side. The connection of the seismic isolation device 1 will be described later.

  Next, the operation of the seismic isolation device 1 will be described. FIG. 3 is a diagram illustrating the operation of the seismic isolation device 1. When a vibration such as an earthquake occurs with the seismic isolation device 1 installed, the lower frame 3, the lower mounting plate 5, and the lower sliding plate 7 fixed to the support leg 19 (floor surface) are displaced together. To do. At this time, the lower surface of the sliding member 9 slides along the curved surface between the sliding range (curved surface portion) of the lower sliding plate 7.

  Further, the upper frame 15, the upper mounting plate 13, and the upper sliding plate 11 that are fixed integrally with the upper plate 17 on which equipment and the like are installed are displaced with respect to the sliding member 9. That is, the upper surface of the sliding member 9 slides along the curved surface between the sliding range (curved surface portion) of the upper sliding plate 11.

  FIG. 3A and FIG. 3B show a state where they are displaced in opposite directions with respect to the shaking. The seismic isolation device 1 repeats the states shown in FIGS. 3A and 3B in response to the shaking, and the shaking is caused by the friction caused by the sliding between the sliding member 9 and the upper and lower sliding plates. Attenuate. The maximum displacement amount of the seismic isolation device 1 is a displacement amount between FIG. 3 (a) and FIG. 3 (b). That is, since the sliding member 9 slides with respect to the upper and lower sliding plates, a displacement amount approximately twice the sliding range of each sliding plate can be obtained. When the shaking is stopped, the sliding member 9 stops at a position substantially at the center of each sliding plate which is the most stable position. Therefore, the restoring force is also high.

  At this time, if the concave curved surfaces 21 and 23 of the lower sliding plate 7 and the upper sliding plate 11 have the same curvature, the upper and lower sliding plates respectively have substantially the same displacement amount with respect to the sliding member 9. It becomes. For example, when the sliding member 9 slides by a predetermined amount with respect to the lower sliding plate 7, the axial direction of the sliding member 9 (upper and lower convex curved surfaces 25 and 27) depends on the curvature of the lower sliding plate 7. The lower sliding plate 7 is inclined toward the center of curvature. At this time, since the curved surface of the upper sliding plate 11 is also contacted, the upper sliding plate 11 and the sliding member 7 slide so as to face the center of curvature of the upper sliding plate 11. Therefore, the sliding amounts of the lower sliding plate 7 and the upper sliding plate 11 and the sliding member 9 are substantially the same.

  Next, the installation method of the seismic isolation apparatus 1 is demonstrated. 4-10 is a figure which shows the installation method of the seismic isolation apparatus 1. FIG. In order to obtain the seismic isolation function, for example, four seismic isolation devices 1 are installed and used as one set. First, as shown in FIG. 4, the floor panel 29 at a position corresponding to the device installation unit 31 for installing facilities and the like is removed. By removing the floor panel 29, the support leg 19 supporting the removed floor panel 29 is exposed. In addition, in order to install four seismic isolation devices 1, two adjacent vertical and horizontal floor panels 29 are removed.

  Next, as shown in FIG. 5, receiving members 33 and 35 are installed on the support leg 19. Fig.5 (a) is a top view of the state which installed the receiving members 33 and 35, FIG.5 (b) is EE sectional view taken on the line. In the following description, unless otherwise specified, each figure (a) is shown as a plan view, and each figure (b) is shown as a cross-sectional view taken along line EE of each corresponding figure (a). Each of the receiving members 33 and 35 is a rod-like member having a length corresponding to two sheets of the floor panel 29.

  As shown in FIG. 5B, the receiving members 33 installed on both sides of the apparatus installation portion 31 have an L-shaped cross-sectional shape, and one surface is provided with a hole through which the support leg 19 can pass, The fixing bracket 36 can be joined to the surface. Similarly, the receiving member 35 installed at the center of the apparatus installation portion 31 has a U-shaped cross-sectional shape, and a hole through which the support leg 19 can pass is provided on the upper surface, and a fixing bracket 36 is provided on the side surface. Can be joined.

  6A and 6B are views showing the fixing bracket 36, FIG. 6A is an exploded perspective view of the fixing bracket 36, FIG. 6B is a side view of the receiving member 33 attached by the fixing bracket 36, and FIG. c) is a front view of a state in which the receiving member 33 is attached by the fixing bracket 36. FIG. In addition, since the attachment state with the receiving member 35 is the same as the attachment state with the receiving member 33, description is abbreviate | omitted.

  The fixing bracket 36 includes a main body 41, a pressing plate 38, a U bolt 45, and the like. The main body 41 is a plate-shaped member having an L-shaped cross-sectional shape, and has two surfaces, a receiving member joint portion 39 and a support leg holding portion 43. The receiving member joint portion 39 is a surface to be joined to the receiving members 33 and 35 and is provided with a bolt hole for joining. The support leg holding part 43 is a part that holds the support leg, and is provided with a notch 42 through which the support leg 19 (the shaft 47 of the support leg 19 (see FIGS. 6B and 6C)) passes. It is done.

  The holding plate 38 is a plate-shaped member having an L-shaped cross section, and one surface is provided on the support leg holding portion 43 of the main body 41 by a bolt or the like. The presser plate 38 covers both sides of the notch 42 so as to block the opening of the U-shaped notch 42 and the end of the support leg holding part 43 and the end of the presser plate 38 are substantially aligned. Installed.

  The other surface of the pressing plate 38 is arranged facing the receiving member joint portion 39 side of the main body 41, and the U-bolt 45 penetrates from the receiving member joint portion 39 side and is fixed by a nut. The bolt interval of the U bolt 45 is such that the support leg 19 (nut 49) can pass therethrough.

  As shown in FIGS. 6B and 6C, the receiving member joining portion 39 of the main body 41 is overlapped with the side surface of the receiving member 33 and joined with a bolt. The support leg holding part 43 of the main body 41 is attached by inserting the shaft 47 of the support leg 19 into the notch part 42. At this time, the outer diameter of the nut 49 for attaching the support leg 19 is larger than the notch width of the notch portion 42. Therefore, the main body 41 is in a state where the support leg holding portion 43 is hooked on the lower side of the nut 49.

  In this state, the pressing plate 38 is attached to the supporting leg holding portion 43 so that the supporting leg 19 is sandwiched between the U-shaped portion of the notch portion 42 and the pressing plate 38. Further, the U bolt 45 is installed so that the U bolt 45 holds the support leg 19, and both ends of the U bolt 45 are fixed to the holding plate 38 with nuts.

  If the receiving member 33 is merely placed on the support leg 19, there is a possibility that the receiving member 33 may be loose in the horizontal direction with respect to the support leg 19 due to the clearance between the support leg 19 and the receiving member 33. Furthermore, since the receiving member 33 is free upward, the receiving member 33 may be lifted with respect to the support leg 19 when the receiving member 33 swings in the vertical direction.

  However, the support leg holding portion 43 is caught by the nut 49 by the fixing bracket 36. For this reason, the backlash of the receiving member 33 can be prevented, and further, since the support leg 19 is held from the vertical direction by the U bolt 45 and the pressing plate 38, the backlash of the receiving member 33 in the horizontal direction can also be prevented. Thus, the receiving member 33 is securely fixed to the support leg 19. The fixing of the receiving members 33 and 35 and the support leg 19 is not limited to this form. The receiving members 33 and 35 do not have to be displaced or lifted with respect to the support leg 19. For example, a plate-like fixing member may be directly fixed to the support leg 19 and the receiving member with a bolt or the like. It doesn't matter.

  Next, the lower frame 3 is installed on the receiving members 33 and 35 as shown in FIG. Four lower frames 3 are installed so as to straddle the receiving members 33 and 35, respectively. The lower frame 3 and the receiving members 33 and 35 are joined with bolts (not shown).

  Next, as shown in FIG. 8, the lower mounting plate 5 and the lower sliding plate 7 are respectively installed on the lower frame 3. At this time, the lower sliding plate 7 is arranged so as to come to equal positions at the four corners of the equipment installation range.

  Next, as shown in FIG. 9, the sliding member 9 is disposed on the lower sliding plate 7, and the upper sliding plate 11, the upper mounting plate 13, and the upper frame 15 are installed above the sliding member 9. Note that the upper sliding plate 11, the upper mounting plate 13, and the upper frame 15 may be joined and integrated in advance. At this time, the lower sliding plate 7 and the upper sliding plate 11 are arranged so as to be in the same position vertically, so that the sliding member 9 is located at the center of each of the lower sliding plate 7 and the upper sliding plate 11. To place.

  The upper frame 15 is substantially rectangular, and the adjacent upper frames 15 are in contact with each other in the long side direction (FIG. 9 (a) left-right direction) of the upper frame 15, and the short side direction (FIG. 9 (a) The upper frames 15 adjacent to each other in the vertical direction are joined to each other by the connecting member 37 below the upper frame 15. The short side direction of the upper frame 15 is the installation direction of the receiving members 33 and 35. The connecting member 37 is a bar-shaped member having an L-shaped cross section. The seismic isolation devices 1 adjacent in the short side direction are connected to each other by the connecting member 37.

  At this time, the total thickness from the upper end portion of the support leg to the upper surface of the sliding member 9 is thicker than the thickness of the adjacent floor panel 29. That is, the lower surface of the upper sliding plate 11 is positioned higher than the upper surface of the adjacent floor panel 29. Therefore, when the upper sliding plate 11 and each member integrated with the upper sliding plate 11 are displaced by an earthquake or the like, they do not interfere with the adjacent floor panel 29.

  Next, as shown in FIG. 10, the upper plate 17 is installed on the upper frame 15. The upper plate 17 has a substantially rectangular shape, and adjacent upper plates 17 are in contact with each other in the long side direction (the left-right direction in FIG. 10A) of the upper plate 17. As described above, the connecting portion 18 is provided on the short side of the upper surface of the upper plate 17. In the upper plates 17 adjacent to each other on the long side of the upper plate 17 (FIG. 10 (a), left and right direction), a connecting member 53 is installed so as to straddle each other's connecting portion 18, and the opposing short side direction (see FIG. It joins to each connection part 18 of the upper plate 17 adjacent to a middle up-down direction. Thereby, four upper plates 17 (seismic isolation devices 1) are connected.

  The connecting portion 18 that is not used for connection is closed by the closing member 51. The closing member 51 is a plate-like member. The connecting member 53 and the closing member 51 have substantially the same thickness as the step depth of the connecting portion 18, and the upper plate 17 is a flat surface when they are attached. As described above, four seismic isolation devices 1 are set and are used in an integrated manner.

  As described above, according to the seismic isolation device 1 according to the embodiment of the present invention, the contact surfaces of the sliding member 9, the lower sliding plate 7, and the upper sliding plate 11 have corresponding curved surfaces. Therefore, the sliding member 9 and each sliding plate are in surface contact. For this reason, the damping capability by friction when the sliding member 9 slides with respect to each sliding plate is high. Further, since the weight from above can be received by the surface, a high bearing force can be obtained. In addition, the center position of each sliding plate becomes the apex of the curved surface, and when receiving a force from above, the sliding member 9 is stabilized at the center position (original position) of each sliding plate. Obtainable.

  Further, since the lower sliding plate 7 and the upper sliding plate 11 slide relative to the sliding member 9, the maximum (horizontal) displacement of the seismic isolation device 1 is the lower sliding plate 7 and the upper sliding plate 11. Therefore, a large displacement can be obtained with a small device.

  Moreover, since the seismic isolation apparatus 1 can be installed in the site | part which removed the floor panel 29, a seismic isolation apparatus can be easily constructed | assembled on a free access floor. Further, receiving members 33 and 35 provided on the support leg 19 are provided, and the upper frame 15 and the upper plate 17 are installed in this order from the lower frame 3 thereon. For this reason, it can be reliably installed on the free access floor.

  Further, the adjacent upper frames 15 are connected to each other by a connecting member 37, and the upper plates 17 are connected to each other by a connecting member 53 in a direction perpendicular to the connecting direction of the connected upper frames 15 to each other. A plurality of seismic isolation devices 1 are securely connected, and a seismic isolation structure can be reliably constructed on the free access floor. Further, since the fixing bracket 36 is used, the receiving members 33 and 35 are not displaced or lifted with respect to the support leg 19, and the seismic isolation device 1 is not lifted or dropped during an earthquake.

  Further, since the thickness from the lower end of the receiving members 33, 35 to the lower end of the upper sliding plate 11 is thicker than the thickness of the surrounding floor panel 29, the upper sliding plate 11 etc. Does not touch the floor panel 29.

  In addition, by installing two seismic isolation devices adjacent to each other in the vertical and horizontal directions, it is possible to stably support the devices installed on the upper portion, and to reliably obtain the seismic isolation effect.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, a lower sliding plate 61 and an upper sliding plate 63 may be used instead of the upper and lower sliding plates of the seismic isolation device 1 as in the seismic isolation device 60 that is the embodiment shown in FIG. Good. The lower sliding plate 61 has a stopper 65 which is a projection directed upward on the outer peripheral portion of the sliding range with the sliding member 9. Further, the upper sliding plate 63 has a stopper 67 which is a projection directed downward on the outer peripheral portion of the sliding range with the sliding member 9. In this case, the sliding member 9 does not slide beyond the stoppers 63 and 65 against shaking such as an earthquake. Therefore, the sliding member 9 does not jump out beyond the sliding range of the upper and lower sliding plates. That is, the relative displacement amount between the lower sliding plate 61 side and the upper sliding plate 63 side can be regulated.

  Further, as in the seismic isolation device 70 shown in FIG. 11B, only one of the upper and lower sliding plates may be a curved surface and the other sliding surface may be a flat surface. The mounting plate 14 (FIG. 1) for mounting the upper sliding plate 71 is not required in the mounting plate having the flat surface (the upper mounting plate 73 in FIG. 11B). When the upper sliding plate 71 is a flat surface, the upper surface of the sliding member 9 is not a curved surface but a flat surface corresponding to the sliding surface of the upper sliding plate 71.

  Moreover, a part or all of the lower frame 3, the lower mounting plate 5, and the lower sliding plate 7 may be integrally formed, or may be formed separately. That is, if a lower support structure having functions of a lower frame, a lower mounting plate, and a lower sliding plate is used, these parts may be separate or integrated. Similarly, a part or all of the upper sliding plate 11, the upper mounting plate 13, the upper frame 15, and the upper plate 17 may be integrally formed. The upper sliding plate, the upper mounting plate, the upper frame, and the upper plate If an upper support structure having a function is used, these parts may be separate or integrated. For example, the lower mounting plate 5 and the lower sliding plate 7 may be integrally formed, and the upper sliding plate 11 and the upper mounting plate 13 may be integrally formed.

  Further, in the embodiment, the seismic isolation device 1 is used by connecting a total of four units in two rows and two columns, but a seismic isolation device may be additionally connected. In this case, for example, when the seismic isolation device is added in the lateral direction (left and right direction in FIG. 10), a connecting member 53 may be installed in the connecting portion 18 on the connecting side instead of the closing member 51. Further, when adding a seismic isolation device in the vertical direction (vertical direction in FIG. 10), for example, the connecting portion 18 is provided on the entire short side of the upper plate 17, and two or more seismic isolation devices are provided. You may connect by the connection member 53. FIG. In this case, the closing member 51 only needs to be disposed over the entire short side of the upper plate 17.

1, 60, 70 ......... Seismic isolation device 3 ......... Lower frame 5 ......... Lower mounting plate 6 ......... Hole 7, 61 ......... Lower sliding plate 9 ......... Sliding members 11, 63, 71 ......... Upper sliding plate 13, 73 ......... Upper mounting plate 14 ......... Hole 15 ......... Upper frame 17 ......... Upper plate 18 ......... Connecting part 19 ......... Support legs 21, 23 ... ...... Concave curved surface 25, 27 ......... Convex curved surface 29 ......... Floor panel 31 ......... Total ground installation part 33, 35 ......... Receiving member 36 ......... Fixing bracket 37 ......... Connecting member 38 ......... Holding plate 39 ......... Receiving member joint portion 41 ......... Main body 42 ......... Notch portion 43 ......... Support leg holding portion 45 ......... U bolt 47 ......... Shaft 49 ... …… Nut 51 ......... Blocking member 53 ......... Connecting member 65, 67 ......... Stopper

Claims (6)

A seismic isolation device used for free access floors,
A lower support structure fixed on a support leg, having a sliding surface above and capable of supporting the weight from above;
A sliding member disposed on the sliding surface of the lower support structure;
An upper support structure disposed on the sliding member, having a sliding surface below and capable of supporting the weight from above;
Comprising
Of the sliding surface of the lower support structure and the sliding surface of the upper support structure, at least one of the sliding surfaces is a concave curved surface having a certain curvature,
The contact surface of the sliding member with the concave curved surface is a convex curved surface corresponding to the concave curved surface, and the sliding member is slidable on the concave curved surface. The lower support structure is
A lower frame installed and fixed on a support leg;
A lower mounting plate fixed on the lower frame;
A lower sliding plate fixed on the lower mounting plate and having a sliding surface;
Have
The seismic isolation device according to claim 1, wherein a part or all of the lower frame, the lower mounting plate, and the lower sliding plate are integrally or separately formed. The upper support structure is
An upper sliding plate disposed on the sliding member and having a sliding surface;
An upper mounting plate fixed on the upper sliding plate;
An upper frame fixed on the upper mounting plate;
An upper plate fixed on the upper frame;
Have
The seismic isolation device according to claim 1 or 2, wherein a part or all of the upper sliding plate, the upper mounting plate, the upper frame, and the upper plate are integrally or separately formed. The contact surface between the sliding surface of the lower support structure and the sliding member is a lower concave curved surface having a certain curvature, and the contact surface with the lower concave curved surface of the sliding member is the lower side A lower convex curved surface corresponding to the concave curved surface,
The contact surface between the sliding surface of the upper support structure and the sliding member is an upper concave curved surface having a certain curvature, and the contact surface of the sliding member with the upper concave curved surface is the upper concave curved surface. Corresponding upper convex curved surface,
The seismic isolation device according to any one of claims 1 to 3, wherein the sliding member is slidable with respect to each of the lower support structure and the upper support structure. The sliding surface of the lower support structure and the sliding surface of the upper support structure are substantially the same size,
The seismic isolation device according to claim 4, wherein the lower concave curved surface and the upper concave curved surface have substantially the same curvature. The height of the sliding member is smaller than the width of the sliding member,
The upper concave curved surface and the lower concave curved surface provided on the upper and lower surfaces of the sliding member have the same curvature,
The seismic isolation device according to claim 5, wherein the sliding member is in surface contact with a sliding surface of the lower support structure and a sliding surface of the upper support structure.

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