Seismic isolation free access floor structure

Abstract

To provide a base isolation free access floor structure which enables a buffer plate to be easily mounted on a floor panel at low cost with sufficient strength.SOLUTION: A base isolation free access floor structure includes a buffer plate 34 provided so as to block a gap 22c formed between a non-base isolation part 22a and a base isolation part 22b, wherein the buffer plate 34 includes a substantially plate-shaped body part, a first mounting member provided along a base end in a width direction of the body part so as to thinly extend in a length direction of the body part, and a connection member for connecting the body part and the first mounting member, the body part and the first mounting member are rotatably connected to each other around a central shaft extending in the length direction of the body part by the connection member, in the base end of the body part, the first mounting member is fixed to a second mounting member provided on a panel support part 32a of a base isolation part support leg 32 supporting a floor panel 24 of the base isolation part 22b, and a bottom part of the base end of the body part is mounted on the base isolation part 22b by being supported by the second mounting member.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seismic isolation free access floor structure in which a buffer plate is provided to close the gap between a floor panel in a seismic isolation section and a floor panel in a non-seismic isolation section. [Background technology]

[0002] Free access floors, in which a second floor surface is formed above the foundation floor by multiple floor panels being supported horizontally at a predetermined height above the foundation floor by multiple support legs installed on the foundation floor, are widely used as the floor structure for rooms such as server rooms in which a large amount of important IT equipment is installed. As an earthquake countermeasure for such free access floors, free access floors with seismic isolation structures have sometimes been used (see Patent Document 1).

[0003] 10 and 11 are diagrams to be referred to in order to explain a conventional free access floor 2 equipped with such a seismic isolation structure.

[0004] As shown in Figure 11, a conventional free access floor 2 comprises a floor panel 4 of a non-seismic isolation section 2a laid on the wall side of a room 1, a floor panel 4 of a seismic isolation section 2b laid in the center of the room 1, and a buffer plate 12 arranged to fill the gap 2c formed between the non-seismic isolation section 2a and the seismic isolation section 2b.

[0005] In the non-seismically isolated section 2a, as shown on the left side of Figure 12, multiple floor panels 4 are supported horizontally at a predetermined height above the foundation floor 3 by multiple support legs 6 installed on the foundation floor 3.

[0006] At this time, each support leg 6 is fixed to the foundation floor 3 using anchor bolts, adhesives, etc., so that the floor panel 4 of the non-seismically isolated section 2a is fixed to the foundation floor 3 and cannot move horizontally when an earthquake or the like occurs and causes horizontal displacement in the building.

[0007] On the other hand, in the seismic isolation section 2b, as shown on the right side of Figure 12, a seismic isolation frame 10 was installed on the foundation floor 3, and multiple floor panels 4 were supported horizontally at a predetermined height above the foundation floor 3 by multiple seismic isolation section support legs 8 installed on the seismic isolation frame 10.

[0008] The seismic isolation frame 10 is installed on the foundation floor 3 so as to be supported by a seismic isolation device 10a provided at the bottom thereof, and the seismic isolation section support leg 8 is formed with a configuration similar to that of the support leg 6 and is fixed to the seismic isolation frame 10 using bolts, nuts, etc.

[0009] This seismic isolation device 10a allows the floor panel 4 of the seismic isolation section 2b to be detached from the foundation floor 3 and move horizontally relative to the foundation floor 3 when an earthquake or the like occurs and causes horizontal displacement in the building.

[0010] Furthermore, the floor panel 4 of the seismic isolation section 2b is positioned horizontally at a predetermined distance from the floor panel 4 of the non-seismic isolation section 2a so as not to come into contact with the floor panel 4 of the non-seismic isolation section 2a in the event of an earthquake, thereby forming a gap 2c between the seismic isolation section 2b and the non-seismic isolation section 2a, the gap 2c having a predetermined opening width in the horizontal direction, and a buffer plate 12 is provided to close this gap 2c.

[0011] As shown in Figure 12, the buffer plate 12 is formed in an approximately plate-like shape with a predetermined thickness dimension, and the horizontal end of the buffer plate 12 on the seismic isolation section 2b side (right side in the figure) is attached to the end of the floor panel 4 of the seismic isolation section 2b via an attachment member 13 provided on the seismic isolation section support leg 8 that supports the floor panel 4 of the seismic isolation section 2b, and the horizontal end of the buffer plate 12 on the non-seismic isolation section 2a side (left side in the figure) is positioned so as to be overlapped on top of the floor panel 4 of the non-seismic isolation section 2a.

[0012] As a result, when an earthquake or the like occurs causing horizontal displacement of the building, the buffer plate 12 is able to move horizontally relative to the foundation floor 3 together with the floor panel 4 of the seismic isolation section 2b, with the horizontal end of the buffer plate 12 on the non-seismic isolation section 2a side always positioned on top of the floor panel 4 of the non-seismic isolation section 2a.

[0013] In this way, in a conventional free access floor 2 equipped with a seismic isolation structure, when an earthquake or the like occurs and causes horizontal displacement of the building, the floor panel 4 of the non-seismically isolated section 2a and the floor panel 4 of the seismic isolation section 2b are prevented from coming into contact with each other, and the buffer plate 12 is able to close the gap 2c between the non-seismically isolated section 2a and the seismic isolation section 2b. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Japanese Utility Model Application Publication No. 7-42835 [Patent Document 2] JP 2012-149429 A Summary of the Invention [Problem to be solved by the invention]

[0015] However, a conventional free access floor equipped with the above-mentioned seismic isolation structure has a problem in that it increases the manufacturing costs of the buffer plates 12 and the construction costs for their installation.

[0016] In other words, in order to reduce unevenness on the upper surface of the free access floor 2 after construction, it is desirable for the thickness dimension of the buffer plate 12 to be as thin as possible, provided that the required strength is provided.

[0017] Therefore, the strength of the buffer plate 12 had to be designed in a different procedure from that of the floor panel 4, a different material had to be selected from that of the floor panel 4, and the buffer plate 12 had to be manufactured in a different process from that of the floor panel 4, which could have resulted in an increase in the manufacturing costs of the buffer plate 12.

[0018] Furthermore, in conventional free access floors equipped with the seismic isolation structure described above, the buffer plate 12 is attached to the floor panel 4 of the seismic isolation section 2b by positioning its end on the inside of the mounting member 13. Therefore, if the buffer plate 12 moves upward during an earthquake, there is a risk that the end of the buffer plate 12 on the seismic isolation section 2b side may come off the mounting member 13.

[0019] In response to this, a configuration has been proposed (see Patent Document 2) in which the end of the buffer plate on the seismic isolation section side fits into and engages with a mounting member attached to the seismic isolation section support leg that supports the floor panel of the seismic isolation section. However, in this case, the structure of the mounting member becomes complicated, which could lead to increased manufacturing costs for the mounting member and more complicated installation work.

[0020] In view of the above problems, the present invention has an object to provide a seismic isolation free access floor structure which reduces the manufacturing costs of buffer plates and enables the buffer plates to be easily attached to floor panels at low cost and with sufficient strength, thereby reducing the construction costs of the free access floor. [Means for solving the problem]

[0021] In order to solve the above problems, the seismic isolation free access floor structure of the present invention is as follows: A seismic isolation free access floor structure comprising a floor panel of a non-seismically isolated portion fixed to a foundation floor, a floor panel of a seismically isolated portion provided so as to be movable horizontally relative to the foundation floor, and a buffer plate provided so as to close a gap formed between the non-seismically isolated portion and the seismically isolated portion, The buffer plate includes a substantially plate-shaped main body, a first attachment member provided so as to extend in an elongated manner in the length direction of the main body along a base end portion in a width direction of the main body, and a connecting member connecting the main body and the first attachment member, The main body and the first mounting member are connected by the connecting member so as to be rotatable with each other about a central axis extending in a longitudinal direction of the main body, The base end of the main body is attached to the seismic isolation section by the first mounting member being fixed to a second mounting member provided on a panel support portion of a support leg of the seismic isolation section that supports a floor panel of the seismic isolation section, and the bottom of the base end of the main body being supported by the second mounting member. It is characterized by the above.

[0022] In addition, the seismic isolation free access floor structure of the present invention is The connecting member is a hinge member including a pair of substantially plate-shaped wing portions and a shaft portion that rotatably connects the pair of wing portions to each other, The main body and the first mounting member are connected to each other so as to be rotatable relative to each other about the shaft by fixing the pair of wing portions to the side surface of the base end portion of the main body and the lower surface of the first mounting member, respectively. It is characterized by the above.

[0023] In addition, the seismic isolation free access floor structure of the present invention is The second mounting member includes a buffer plate support portion extending horizontally along an upper surface of the panel support portion of the seismic isolation unit support leg, and a buffer plate mounting portion extending substantially parallel to the buffer plate support portion at a predetermined interval above the buffer plate support portion, the first mounting member is fixed to the buffer plate mounting portion of the second mounting member, The bottom of the base end of the main body is placed on the buffer plate support part of the second mounting member. It is characterized by the above.

[0024] In addition, the seismic isolation free access floor structure of the present invention is The main body of the shock absorber is manufactured by processing the floor panel. It is characterized by the above. Effect of the Invention

[0025] According to the seismic isolation free access floor structure of the present invention, A seismic isolation free access floor structure comprising a floor panel of a non-seismically isolated portion fixed to a foundation floor, a floor panel of a seismically isolated portion provided so as to be movable horizontally relative to the foundation floor, and a buffer plate provided so as to close a gap formed between the non-seismically isolated portion and the seismically isolated portion, The buffer plate includes a substantially plate-shaped main body, a first attachment member provided so as to extend in an elongated manner in the length direction of the main body along a base end portion in a width direction of the main body, and a connecting member connecting the main body and the first attachment member, The main body and the first mounting member are connected by the connecting member so as to be rotatable with each other about a central axis extending in a longitudinal direction of the main body, The base end of the main body is attached to the seismic isolation section by the first mounting member being fixed to a second mounting member provided on a panel support portion of a support leg of the seismic isolation section that supports the floor panel of the seismic isolation section, and the bottom of the base end of the main body is supported by the second mounting member. This reduces the manufacturing costs of the buffer plate and also enables the buffer plate to be easily attached to the floor panel at low cost and with sufficient strength, thereby reducing the construction costs of the free access floor. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is a side view of a free access floor 22 according to an embodiment of the present invention. [Diagram 2] 2A and 2B are diagrams showing a floor panel 24 in the free access floor 22 shown in FIG. 1, with FIG. 2A being a bottom view and FIG. 2B being a side view. [Diagram 3] 2 is a plan view of a buffer plate 34 in the free access floor 22 shown in FIG. 1. [Figure 4] 2 is a side view of a buffer plate 34 in the free access floor 22 shown in FIG. 1. FIG. [Diagram 5] 5(a) is an enlarged cross-sectional view taken along line AA in FIG. 3, and FIG. 5(b) is an enlarged cross-sectional view taken along line BB in FIG. 3. FIG. [Figure 6] 2 is an enlarged side view showing the periphery of the base end portion of the buffer plate 34 in the free access floor 22 shown in FIG. 1. FIG. [Figure 7] 2 is an enlarged side view showing the periphery of the tip of a buffer plate 34 in the free access floor 22 shown in FIG. 1. FIG. [Figure 8] FIG. 2 is a schematic side view for explaining the behavior of the free access floor 22 shown in FIG. 1 when an earthquake occurs. [Figure 9] FIG. 2 is a schematic side view for explaining the behavior of the free access floor 22 shown in FIG. 1 when an earthquake occurs. [Figure 10] FIG. 11 is a plan view showing another embodiment of the buffer plate 34, that is, a buffer plate 34 for four corners. [Figure 11] FIG. 1 is a schematic plan view showing a room 1 in which a conventional free access floor 2 with a seismic isolation structure is installed. [Figure 12] FIG. 12 is a side view of the free access floor 2 shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a seismic isolation free access floor structure according to the present invention will be described with reference to the drawings.

[0028] 1 to 9 are diagrams to be referred to in order to explain a free access floor 22 with a seismic isolation structure according to one embodiment of the present invention. Note that, with some exceptions, the same parts as those in the conventional free access floor 2 with a seismic isolation structure shown in Figs. 11 and 12 are denoted by the same reference numerals and will be explained.

[0029] As shown in Figure 1, the free access floor 22 of this embodiment, like the conventional free access floor 2 (see Figure 11), comprises a floor panel 24 of a non-seismic isolation section 22a laid on the wall side of a room 1, a floor panel 24 of a seismic isolation section 22b laid in the center of the room 1, and a buffer plate 34 arranged to fill the gap 22c formed between the non-seismic isolation section 22a and the seismic isolation section 22b.

[0030] In the non-seismically isolated section 22a, as shown on the left side of Figure 1, multiple floor panels 24 are supported horizontally at a predetermined height above the foundation floor 3 by multiple support legs 26 installed on the foundation floor 3.

[0031] As shown in Figures 2(a) and (b), the floor panel 24 has a flat upper surface and a substantially plate-like flat portion 24a having a substantially square planar shape, and a plurality of ribs 24b which are formed integrally with the flat portion 24a, have height portions which protrude downward from the rear surface of the flat portion 24a, and have length portions which extend in a substantially lattice pattern in the vertical and horizontal directions along the rear surface of the flat portion 24a.

[0032] As shown in FIG. 2(a), bolt holes 24c are formed in the four corners of the floor panel 24, penetrating the flat plate portion 24a in the thickness direction (the direction perpendicular to the paper surface of the figure).

[0033] Such a floor panel 24 is formed, for example, as a die-cast product using an aluminum alloy as its material, by integrally molding the flat plate portion 24a and the ribs 24b.

[0034] As shown in FIG. 1, the support leg 26 includes a leg portion 27 placed on the foundation floor 3 and an adjustment base 28 provided on the upper portion of the leg portion 27.

[0035] The leg portion 27 of the support leg 26 includes a substantially plate-shaped base plate 27a arranged substantially horizontally along the foundation floor 3, a pillar 27b arranged vertically from the center of the upper surface of the base plate 27a, and a male thread portion 27c provided on the upper end portion of the pillar 27b.

[0036] The adjustment base 28 of the support leg 26 is formed in an approximately cylindrical shape having a central axis extending in the vertical direction, and is equipped with a boss portion 28a having a threaded portion formed on the inner surface of the central hole, and a approximately disk-shaped panel support portion 28b having a flat upper surface and arranged to extend radially outward in the horizontal direction from the upper end of the boss portion 28a.

[0037] In addition, on the panel support portion 28b, a panel fixing portion 28c is formed in an approximately cylindrical shape having a central axis extending in the vertical direction and having a threaded portion formed on the inner surface of its central hole, and is provided integrally with the panel support portion 28b or detachably attached to the panel support portion 28b.

[0038] The male threaded portion 27c of the leg 27 is screwed from below into the female threaded portion of the boss portion 28a of the adjustment table 28. In this state, the height position of the panel support portion 28b of the support leg 26 from the foundation floor 3 can be adjusted by rotating the adjustment table 28 relative to the leg 27 along the spiral trajectory of the screw of the male threaded portion 27c.

[0039] In the non-seismically isolated section 22a of the free access floor 22, as shown in Figure 1, multiple such support legs 26 are installed on the foundation floor 3 on the wall side of the room 1 (left side in the figure), and multiple floor panels 24 supported by these support legs 26 are arranged in a row along the wall of the room 1 with their four sides adjacent to each other horizontally (see Figure 11).

[0040] At this time, each support leg 26 is installed on the foundation floor 3 by fixing the base plate 27a to the foundation floor 3 using anchor bolts, adhesive, etc., so that it cannot move horizontally relative to the foundation floor 3.

[0041] Each floor panel 24 is arranged so that its four corners are butted against each other (up to four floor panels 24), and the four corners of the butted floor panels 24 are placed on the panel support portion 28b of one support leg 26, while the other four corners of the floor panels 24 are each placed on the panel support portion 28b of another support leg 26, thereby supporting the floor panels 24 horizontally at a predetermined height above the foundation floor 3.

[0042] The panel fixing bolt 25 is inserted into the bolt hole 24c of the floor panel 24 from the upper side of the floor panel 24, and its tip is screwed into the female thread portion of the panel fixing portion 28c provided on the panel support portion 28b of the support leg 26, thereby fixing the floor panel 24 to the support leg 26.

[0043] Therefore, the floor panel 24 of the non-seismically isolated portion 22a is fixed to the foundation floor 3 and is arranged so as not to move horizontally when an earthquake or the like occurs and causes horizontal displacement in the building.

[0044] On the other hand, in the seismic isolation section 22b, as shown on the right side of Figure 1, a seismic isolation frame 30 is installed on the foundation floor 3, and multiple floor panels 24 are supported horizontally at a predetermined height position above the foundation floor 3 by multiple seismic isolation section support legs 32 installed on the seismic isolation frame 30.

[0045] As shown in FIG. 1, the seismic isolation section support leg 32 is formed to have a similar configuration (legs and adjustment base) to the support leg 26, but on the other hand, the overall height dimension is formed to be smaller than that of the support leg 26.

[0046] The seismic isolation frame 30 is formed by combining a plurality of beam members 30a, each having an H-shaped (or I-shaped) cross section, extending horizontally in a generally lattice-like manner in the vertical and horizontal directions.

[0047] A seismic isolation device 30b is provided at the bottom of the seismic isolation frame 30, and the seismic isolation frame 30 is placed on the foundation floor 3 so as to be supported by this seismic isolation device 30b.

[0048] In the seismic isolation section 22b of the free access floor 22, as shown in Figure 1, such a seismic isolation frame 30 is installed on the foundation floor 3, and multiple seismic isolation section support legs 32 are installed on the seismic isolation frame 30, and multiple floor panels 24 supported by these seismic isolation section support legs 32 are arranged in a row in the center of the room 1 with their four sides adjacent to each other horizontally (see Figure 11).

[0049] At this time, each seismic isolation section support leg 32 is fixed onto the seismic isolation frame 30 using bolts, nuts, etc., and each floor panel 24, like the floor panel 24 of the non-seismic isolation section 22a, has its four corners placed on the panel support portions 32a of the seismic isolation section support legs 32 and is fixed to the seismic isolation section support legs 32 using panel fixing bolts 25.

[0050] Furthermore, a plurality of rolling spheres are provided at the portion of the seismic isolation device 30b that comes into contact with the foundation floor 3, and the seismic isolation frame 30 is placed on the foundation floor 3 so that the rolling of these spheres allows the seismic isolation frame 30 to move horizontally relative to the foundation floor 3.

[0051] In addition, a coil spring (not shown) and an oil damper (not shown) are provided to horizontally connect the foundation floor 3 and the seismic isolation frame 30, and the restoring force of the coil spring and the damping force of the oil damper return the horizontal position of the seismic isolation frame 30 to a predetermined initial position.

[0052] As a result, the floor panel 24 of the seismic isolation section 22b is arranged so that it can be detached from the foundation floor 3 and move horizontally relative to the foundation floor 3 when an earthquake or the like occurs and causes horizontal displacement in the building.

[0053] As such, since the behavior of floor panel 24 of seismic isolation section 22b differs from that of floor panel 24 of non-seismic isolation section 22a when horizontal displacement occurs in the building during an earthquake, floor panel 24 of seismic isolation section 22b is positioned horizontally a predetermined distance away from floor panel 24 of non-seismic isolation section 22a so that floor panel 24 of seismic isolation section 22b does not come into contact with floor panel 24 of non-seismic isolation section 22a when it moves.

[0054] As a result, a gap 22c having a predetermined opening width in the horizontal direction (left-right direction in Figure 1) is formed between the seismic isolation section 22b and the non-seismic isolation section 22a along the outer periphery of the floor panel 24 of the seismic isolation section 22b, and a buffer plate 34 is provided to close this gap 22c.

[0055] As shown in FIG. 3, the buffer plate 34 comprises a substantially plate-like main body 35 having a substantially rectangular planar shape, an attachment member 36 (first attachment member) provided along the base end (the end on the right side in the figure) of the main body 35 in the width direction (left-right direction in the figure), and two hinge members 37 (connecting members) that connect the main body 35 and the attachment member 36.

[0056] As shown in Figures 3 and 4, the main body 35 of the buffer plate 34 has a flat upper surface and is provided with a substantially plate-like flat portion 35a having a substantially square planar shape, and a plurality of ribs 35b which are formed integrally with the flat portion 35a, have height portions which protrude downward from the rear surface of the flat portion 35a, and have length portions which extend in a substantially lattice pattern in the vertical and horizontal directions along the rear surface of the flat portion 35a.

[0057] As shown in FIG. 4, at the tip (the end on the left side in the figure) of main body portion 35 in the width direction (left-right direction in the figure), the height dimension of rib 35b (and the thickness dimension of flat portion 35a) gradually decreases toward the tip of main body portion 35 in the width direction, thereby forming an inclined portion 35c such that the bottom of main body portion 35 is inclined toward the upper surface of main body portion 35.

[0058] Such a main body 35 is formed, for example, as a die-cast product using an aluminum alloy as its material, by integrally molding the flat plate portion 35a and the ribs 35b.

[0059] As shown in Figure 1, the main body 35 has a thickness dimension (up and down direction in the figure) that is approximately the same as the thickness dimension of the floor panel 24, a width dimension (left and right direction in the figure) that is slightly smaller than the opening width of the gap 22c formed between the floor panel 24 of the seismic isolation section 22b and the floor panel 24 of the non-seismic isolation section 22a, and a length dimension perpendicular to the width direction (perpendicular to the paper surface of the figure) that is approximately the same as the length dimension of one side of the outer portion of the floor panel 24.

[0060] Thus, the main body 35 has a configuration common to the floor panel 24 shown in FIG. 2 in terms of material, size, and part of the structure.

[0061] As shown in Figures 3 and 4, the mounting member 36 (first mounting member) of the buffer plate 34 is elongated in the longitudinal direction of the main body 35 (the vertical direction in Figure 3) and is formed in a roughly square rod shape with a cross-sectional shape perpendicular to the longitudinal direction that is roughly rectangular (see Figure 4), and the longitudinal dimension of the mounting member 36 is formed to be roughly the same as the longitudinal dimension of the main body 35.

[0062] As shown in FIG. 3, bolt holes 36a are formed in three locations along the length of the mounting member 36, i.e., near the center and both ends in the longitudinal direction of the mounting member 36, penetrating the mounting member 36 in the thickness direction (the up-down direction in the figure), as shown in FIG. 5(a).

[0063] Furthermore, as shown in FIG. 3, at two locations along the length of the mounting member 36, i.e., at positions further toward the center than the two bolt holes 36a formed near both ends of the mounting member 36, recesses 36b are formed so that the entire width direction (left-right direction in the figure) of the underside of the mounting member 36 is recessed toward the top surface of the mounting member 36 over a predetermined width dimension in the length direction of the mounting member 36 (perpendicular to the paper surface of the figure), as shown in FIG. 5(b).

[0064] As shown in FIG. 3, such mounting member 36 is arranged so that its length extends in the length direction (up and down direction in the figure) of main body portion 35 along the base end (the end on the right side in the figure) of the width direction (left and right direction in the figure) of main body portion 35.

[0065] At this time, as shown in Figure 5 (b), the upper surface of main body 35 and the upper surface of mounting member 36 are positioned on the same plane, and mounting member 36 is positioned slightly horizontally outward (to the right in the figure) from the base end (the end on the right in the figure) of main body 35 in the width direction (left-right direction in the figure).

[0066] The main body 35 and the mounting member 36 are connected to each other by hinge members 37 at two points along the length of the mounting member 36, i.e., at the position of a recess 36b of the mounting member 36 which is formed further toward the center than the two bolt holes 36a formed near both ends of the mounting member 36.

[0067] That is, as shown in FIG. 5(b), the hinge member 37 comprises a pair of roughly plate-shaped wing portions 37a, 37b having tube portions at their ends, and an axis portion 37c which is continuously inserted through the tube portions of the wing portions 37a, 37b to rotatably connect them to each other, and one of the wing portions 37a of the hinge member 37 is positioned so as to extend along the side surface of the base end portion (the end portion on the right side in the figure) in the width direction (left-right direction in the figure) of the main body portion 35 and is fixed to the main body portion 35 by a flat head screw and nut 37d or the like, and the other wing portion 37b of the hinge member 37 is positioned inside the recess 36b on the underside of the mounting member 36 and is fixed to the mounting member 36 by a flat head screw 37e.

[0068] This allows the main body 35 and the mounting member 36 to rotate relatively to each other around the shaft 37c of the hinge member 37, which extends in the longitudinal direction of the main body 35 (and in the longitudinal direction of the mounting member 36).

[0069] As shown in Figure 6, the widthwise base end of the main body 35 of such a buffer plate 34 is attached to the seismic isolation section 22b by fixing the mounting member 36 to a mounting member (second mounting member) consisting of a bracket 38 and an L-shaped member 40 provided on the upper surface of the panel support portion 32a of the seismic isolation section support leg 32 that is positioned closest to the gap 22c (left side in the figure) among the multiple seismic isolation section support legs 32 that support the floor panel 24 of the seismic isolation section 22b.

[0070] As shown in Figure 6, the bracket 38 comprises a substantially plate-shaped buffer plate support portion 38a extending horizontally (left-right direction in the figure), a substantially plate-shaped connecting portion 38b bending at substantially a right angle from the end of the buffer plate support portion 38a on the right side in the figure and extending upward, and a substantially plate-shaped buffer plate mounting portion 38c bending at substantially a right angle from the upper end of the connecting portion 38b toward the buffer plate support portion 38a (left side in the figure) and extending substantially parallel to the buffer plate support portion 38a at a predetermined distance above the buffer plate support portion 38a, and is formed with a predetermined width dimension in the direction perpendicular to the plane of the figure.

[0071] The horizontal length dimension (left-right direction in FIG. 6) of the buffer plate mounting portion 38c is formed to be slightly smaller than the width direction (left-right direction in FIG. 6) dimension of the mounting member 36 of the buffer plate 34, and the horizontal length dimension of the buffer plate support portion 38a is formed to be sufficiently larger than the horizontal length dimension of the buffer plate mounting portion 38c.

[0072] As shown in Figure 6, the L-shaped member 40 has a roughly plate-shaped bottom plate portion 40a extending horizontally (left and right in the figure) and a roughly plate-shaped side plate portion 40b bent at roughly a right angle from the right end of the bottom plate portion 40a in the figure and extending upward, and is formed with a predetermined width dimension in the direction perpendicular to the plane of the figure.

[0073] The vertical height of the side plate portion 40b is formed to be approximately the same as the thickness of the floor panel 24.

[0074] As shown in Figure 6, the L-shaped member 40 is placed on top of the panel support portion 32a of the seismic isolation section support leg 32 so that the bottom plate portion 40a is in contact along the upper surface of the panel support portion 32a and the right side surface of the side plate portion 40b is in contact along the left side surface of the floor panel 24 of the seismic isolation section 22b, and the bottom plate portion 40a is fixed to the panel support portion 32a of the seismic isolation section support leg 32 by screws 40c.

[0075] The bracket 38 is placed on top of the L-shaped member 40 so that the buffer plate support portion 38a overlaps the bottom plate portion 40a of the L-shaped member 40 and the connecting portion 38b overlaps the left side of the side plate portion 40b of the L-shaped member 40 in the figure, and the connecting portion 38b is fixed to the side plate portion 40b of the L-shaped member 40 by a flat head screw and nut 38d.

[0076] As shown in FIG. 6, the mounting member 36 of the buffer plate 34 is placed on the buffer plate mounting portion 38c of the bracket 38 so as to fit along the outer periphery of the outermost floor panel 24 of the seismic isolation section 22b that faces the gap 22c, and the right side of the mounting member 36 in the figure is positioned so as to contact the left side of the side plate portion 40b of the L-shaped member 40 in the figure.

[0077] The fixing bolt 39 is inserted into the bolt hole 36a of the mounting member 36 from the upper side of the mounting member 36, and its tip passes through the buffer plate mounting portion 38c and is screwed into the nut member 38e provided on the underside of the buffer plate mounting portion 38c, thereby fixing the mounting member 36 of the buffer plate 34 to the buffer plate mounting portion 38c of the bracket 38.

[0078] At this time, the upper surfaces of the main body 35 and mounting member 36 of the buffer plate 34 are arranged so as to be positioned on the same plane as the upper surface of the floor panel 24 of the seismic isolation section 22b.

[0079] The bottom of the base end (the end on the right side in FIG. 6) of the main body portion 35 of the buffer plate 34 is disposed so as to be placed on the buffer plate support portion 38a of the mounting member 38.

[0080] As a result, the main body 35 of the buffer plate 34 can rotate in the longitudinal direction of the main body 35 and the mounting member 36, i.e., in the clockwise direction in Figure 6, around the axis 37c of the hinge member 37 extending along the outer periphery of the outermost floor panel 24 of the seismic isolation section 22b that faces the gap 22c. However, since the bottom of the base end of the main body 35 is supported and engaged by the buffer plate support portion 38a, the bottom plate portion 40a of the mounting member 40 below it, and the panel support portion 32a of the seismic isolation section support leg 32, it cannot rotate in the opposite direction (counterclockwise direction in Figure 6).

[0081] On the other hand, as shown in FIG. 7, the leading end in the width direction of the main body 35 of the buffer plate 34 is supported by a buffer plate support leg 42 installed on the foundation floor 3.

[0082] As shown in Figure 1, the buffer plate support leg 42 is formed with a similar configuration (leg and adjustment base) to the support leg 26 and is installed at a position on the foundation floor 3 in the gap 22c, closer to the non-seismically isolated portion 22a (left side in the figure), and a support member 44 is provided on top of the panel support portion 42a.

[0083] As shown in FIG. 7, the support member 44 has a roughly plate-shaped flat portion 44a extending horizontally (left-right direction in the figure) and a roughly plate-shaped inclined portion 44b bending from the right-hand end of the flat portion 44a in the figure and extending toward the lower right in the figure, and is formed with a predetermined width dimension in the direction perpendicular to the plane of the figure.

[0084] The support member 44 is placed on the panel support portion 42a of the buffer plate support leg 42 so that the flat plate portion 44a is in contact with the upper surface of the panel support portion 42a and the inclined portion 44b is inclined toward the seismic isolation portion 22b, and the flat plate portion 44a is fixed to the panel support portion 42a of the buffer plate support leg 42 by screws 44c.

[0085] In addition, a support plate member 46 is provided on the panel support portion 28b of the support leg 26 that is located closest to the gap 22c (right side in the figure) among the multiple support legs 26 that support the floor panel 24 of the non-seismically isolated portion 22a.

[0086] As shown in Figure 7, the receiving plate member 46 comprises a roughly plate-shaped bottom plate portion 46a extending horizontally (left-right direction in the figure), a roughly plate-shaped side plate portion 46b bending at roughly a right angle from the right-hand end of the bottom plate portion 46a in the figure and extending upward, and a roughly plate-shaped inclined portion 46c bending from the upper end of the side plate portion 46b and extending toward the lower right in the figure, and is formed with a predetermined width dimension in the direction perpendicular to the plane of the figure.

[0087] The inclination angle of the inclined portion 46c is formed to be substantially the same as the inclination angle of the inclined portion 35c of the main body portion 35 of the buffer plate 34.

[0088] The receiving plate member 46 is positioned so that the bottom plate portion 46a is sandwiched between the panel support portion 28b and the floor panel 24 placed on it, along the upper surface of the panel support portion 28b, and the left side surface of the side plate portion 46b in the figure contacts along the right side surface of the floor panel 24 of the non-seismic isolation portion 22a, and is positioned on the panel support portion 28b of the support leg 26 so that the inclined portion 46b is inclined toward the seismic isolation portion 22b, and the bottom plate portion 46a is fixed to the panel support portion 28b of the support leg 26 by screws 46d.

[0089] As shown in Figure 7, the widthwise tip of the main body portion 35 of the buffer plate 34 is positioned so that the upper surface of the main body portion 35 is located on the same plane as the upper surface of the floor panel 24 of the non-seismic isolation portion 22a, with the approximately horizontal bottom of the main body portion 35 placed on a support member 44 provided on the panel support portion 42a of the buffer plate support leg 42, and the inclined portion 35c of the main body portion 35 is positioned close to and along the inclined surface of the inclined portion 46b of the receiving plate member 46 provided on the panel support portion 28b of the support leg 26 that supports the floor panel 24 of the non-seismic isolation portion 22a.

[0090] As a result, most of the weight of the leading end of the body portion 35 of the buffer plate 34 in the width direction is supported by the buffer plate support legs 42 .

[0091] In this way, the buffer plate 34 has its base end in the width direction of the main body portion 35 supported by the seismic isolation section support leg 32 and its tip end in the width direction of the main body portion 35 supported by the buffer plate support leg 42, so that the main body portion 35 is supported with sufficient support strength to close the gap 22c between the non-seismic isolation section 22a and the seismic isolation section 22b.

[0092] Next, the behavior of the buffer plate 34 in the free access floor 22 when the building is horizontally displaced due to an earthquake or the like will be described with reference to Figs.

[0093] First, as shown in Figure 8, when a horizontal displacement occurs in the building due to an earthquake or the like, causing the floor panel 24 of the seismic isolation section 22b to move closer to the floor panel 24 of the non-seismic isolation section 22a, the inclined portion 35c of the tip (left end in the figure) of the main body 35 of the buffer plate 34 comes into contact with the inclined portion 46c of the receiving plate member 46, and then moves in the upper left direction in the figure along the inclination of the inclined portion 46c.

[0094] As a result, the main body 35 of the buffer plate 34 rotates clockwise in the figure around the shaft portion 37c of the hinge member 37, while the tip of the main body 35 slides over the inclined portion 46c of the receiving plate member 46, causing the floor panel of the non-seismically isolated portion 22a to move up onto 24.

[0095] Next, as shown in Figure 9, when a horizontal displacement occurs in the building due to an earthquake or the like, causing the floor panel 24 of the seismic isolation section 22b to move away from the floor panel 24 of the non-seismic isolation section 22a, the tip portion (left end portion in the figure) of the main body portion 35 of the buffer plate 34 slides over the flat plate portion 44a of the support member 44 and moves to the right in the figure, and becomes separated from the panel support portion 42a of the buffer plate support leg 42.

[0096] At this time, the main body 35 of the buffer plate 34 is engaged by having the bottom of its base end (the right end in Figure 9) supported by the buffer plate support portion 38a of the bracket 38, etc., so that the main body 35 cannot rotate counterclockwise in Figure 9 around the shaft portion 37c of the hinge member 37, and the height position of the tip of the main body 35 does not decrease.

[0097] When the displacement due to an earthquake or the like stops, the floor panel 24 of the seismic isolation section 22b returns to its predetermined initial position due to the restoring force of the coil spring and the damping force of the oil damper installed between the foundation floor 3 and the seismic isolation frame 30, and accordingly, the tip portion (the left end portion in the figure) of the main body portion 35 of the buffer plate 34 moves to its initial position above the panel support portion 42a of the buffer plate support leg 42, as shown in Figure 1.

[0098] At this time, the bracket 38 etc. supporting the main body 35 of the buffer plate 34 elastically deforms due to the weight of the buffer plate 34 etc., so that even if the height position of the tip of the main body 35 is slightly lowered, when the tip of the main body 35 approaches the panel support portion 42a of the buffer plate support leg 42, the inclined portion 35c of the tip comes into contact with the inclined portion 44b of the support member 44 and slides over the inclined portion 44b and rides up onto the panel support portion 42a of the buffer plate support leg 42.

[0099] In this way, in the free access floor 22, when an earthquake or the like occurs and horizontal displacement occurs in the building, the floor panel 24 of the non-seismic isolation section 22a and the floor panel 24 of the seismic isolation section 22b are prevented from coming into contact with each other, and the buffer plate 34 is capable of sealing the gap 22c between the floor panel 24 of the non-seismic isolation section 22a and the floor panel 24 of the seismic isolation section 22b.

[0100] By using such a seismic isolation free access floor structure according to this embodiment, the manufacturing costs of the buffer plate 34 can be reduced.

[0101] In other words, as described above, the material, partial size and structure of the main body 35 of the buffer plate 34 are common to the floor panel 24 shown in Figure 2, and therefore the floor panel 24, its manufacturing process and part of the strength calculation procedure can be reused to produce the buffer plate 34.

[0102] Furthermore, the mounting member 36 can be easily produced by processing a long, thin, square rod-shaped member, the hinge member 37 can be a commercially available product, the bracket 38, L-shaped member 40, support member 44 and receiving plate member 46 can be easily produced by bending an approximately rectangular plate-shaped member at a predetermined position, and the buffer plate support leg 38 can be reused from the existing support leg 26.

[0103] In this way, the buffer plate 34 and the members used for mounting it are both easy to manufacture and secure, so that the manufacturing costs of the buffer plate 34 can be reduced.

[0104] Furthermore, by using the seismic isolation free access floor structure according to this embodiment, the buffer plate 34 can be easily attached with sufficient strength.

[0105] In other words, the mounting member 36 of the buffer plate 34 is firmly fixed to the buffer plate mounting portion 38c of the bracket 38 using the fixing bolt 39, so that even if the buffer plate 34 moves in such a way that it jumps up, the buffer plate 34 can be prevented from coming off the floor panel 24 of the seismic isolation section 22b.

[0106] The buffer plate 34 can be attached using existing means such as flat head screws and bolts, so no special tools or jigs are required and the plate can be easily attached.

[0107] As such, with the seismic isolation free access floor structure according to this embodiment, the manufacturing costs of the buffer plates can be reduced and the buffer plates can be easily attached to the floor panels at low cost and with sufficient strength, thereby reducing the construction costs of the free access floor.

[0108] Furthermore, according to the seismic isolation free access floor structure of this embodiment, the mounting member 36 of the buffer plate 34 is positioned between the main body 35 of the buffer plate 34 and the floor panel 24 of the seismic isolation section 22b, so that when viewed from the top side of the floor panel 24, the members used to mount the buffer plate 34 (bracket 38 and L-shaped member 40) can be hidden and a gap can be prevented from being created between the main body 35 and the floor panel 24.

[0109] Furthermore, according to the seismic isolation free-access floor structure of this embodiment, the main body 35 of the buffer plate 34 is made by reusing the materials used for the floor panel 24, thereby improving the sense of unity in appearance between the floor panel 24 and the buffer plate 34 when viewed from the top side of the floor panel 24.

[0110] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention in which the object of the invention can be achieved.

[0111] For example, in the seismic isolation free access floor structure in the above embodiment, as shown in FIG. 3, the planar shape of the main body 35 of the buffer plate 34 is formed into an approximately rectangular shape, but the planar shape of the main body 35 is not limited to such a configuration, and the planar shape of the main body 35 may be formed into a shape other than an approximately rectangular shape.

[0112] That is, for example, when installing buffer plates 34 at the four corners of gap 22c (see Figure 11) which is formed in an approximately rectangular shape along the outer periphery of seismic isolation section 22b, buffer plates 34 may be used in which the planar shape of main body section 35 is formed into an approximately trapezoidal shape, as shown in Figure 10, such that the lower side of the four sides constituting the outer shape of main body section 35 extends in an approximately 45-degree diagonal direction (from the upper right to the lower left in the figure) from the base end (the end on the right side in the figure) of main body section 35 to the tip end (the end on the left side in the figure).

[0113] Furthermore, in the seismic isolation free access floor structure of the above embodiment, the longitudinal dimension (vertical direction in Figure 3) of the main body 35 is formed to be approximately the same as the longitudinal dimension of one side of the outer portion of one floor panel 24, but the longitudinal dimension of the main body 35 is not limited to such a configuration, and for example, a long and narrow gap that would be blocked by multiple buffer plates 34 shown in Figure 3 lined up in the longitudinal direction may be blocked by a single buffer plate formed so that the longitudinal dimension of the main body is an integer multiple, such as two or three times, of the longitudinal dimension of one side of the floor panel 24.

[0114] Furthermore, in the seismic isolation free access floor structure in the above embodiment, the free access floor 22 uses a substantially plate-shaped flat portion 24a with ribs 24b molded integrally onto the rear surface thereof, however, the floor panel 24 is not limited to such a configuration, and for example, a floor panel may be used in which a reinforcing member is disposed in the internal space of a main body formed into a substantially box shape by pressing.

[0115] Furthermore, in the seismic isolation free access floor structure in the above embodiment, the widthwise tip of the main body 35 of the buffer plate 34 is supported by the buffer plate support legs 40 installed on the foundation floor 3, but the support means for the tip of the main body 35 is not limited to such a configuration, and as long as the tip of the main body 35 is supported with sufficient supporting strength, it may be supported by any means.

[0116] Furthermore, in the seismic isolation free-access floor structure in the above embodiment, the seismic isolation frame 30 is formed by combining beam-like members 30a with an H-shaped (or I-shaped) cross section in a roughly lattice pattern, but the configuration of the seismic isolation frame 30 is not limited to this, and the seismic isolation frame 30 may be formed by combining members other than beam-like members 30a with an H-shaped (or I-shaped) cross section, such as square pipes. [Explanation of symbols]

[0117] 1 room 2 Free access floor 2a Non-seismic isolation section 2b Seismic isolation section 2c Gap 3 Foundation floor 4 Floor Panel 6 Support legs 8. Seismic isolation support legs 10 Seismic isolation frame 10a Seismic isolation device 12 Buffer plate 13 Mounting material 22 Free access floor 22a Non-earthquake-proof section 22b Seismic isolation section 22c Gap 24 Floor Panel 24a Flat plate part 24b Rib 24c bolt hole 25 Panel fixing bolt 26 Support legs 27 Legs 27a Base plate 27b Post 27c male thread 28 Adjustment table 28a Boss section 28b Panel support 28c Panel fixing part 30 Seismic isolation frame 30a Beam-like member 30b Seismic isolation device 32 Seismic isolation support leg 32a Panel support 34 Buffer plate 35 Main body 35a Flat plate part 35b Rib 35c slope section 36 Mounting material 36a Bolt hole 36b Recess 37 Hinge parts 37a, 37b Wing section 37c Shaft 37d Flat head screws and nuts 37e Flat head screw 38 Bracket 38a Buffer plate support part 38b Connection part 38c Buffer plate mounting part 38d Flat head screws and nuts 38e Nut material 39 Fixing bolt 40 L-shaped member 40a Bottom plate part 40b Side plate part 40c screw 42 Buffer plate support leg 42a Panel support 44 Support member 44a Flat plate part 44b Slope 44c screw 46 Support plate member 46a Bottom plate part 46b Side plate part 46c Slope 46d Screw

Claims

1. A seismic isolation free access floor structure comprising a floor panel of a non-seismically isolated portion fixed to a foundation floor, a floor panel of a seismically isolated portion provided so as to be movable horizontally relative to the foundation floor, and a buffer plate provided so as to close a gap formed between the non-seismically isolated portion and the seismically isolated portion, The buffer plate includes a substantially plate-shaped main body, a first attachment member provided so as to extend in an elongated manner in the length direction of the main body along a base end portion in a width direction of the main body, and a connecting member connecting the main body and the first attachment member, The main body and the first mounting member are connected by the connecting member so as to be rotatable with each other about a central axis extending in a longitudinal direction of the main body, The base end of the main body is attached to the seismic isolation section by the first mounting member being fixed to a second mounting member provided on a panel support portion of a support leg of the seismic isolation section that supports a floor panel of the seismic isolation section, and the bottom of the base end of the main body being supported by the second mounting member. A seismic isolation free access floor structure.

2. the connecting member is a hinge member including a pair of wing portions and a shaft portion that rotatably connects the pair of wing portions to each other, The main body and the first mounting member are connected to each other so as to be rotatable relative to each other about the shaft by fixing the pair of wing portions to the side surface of the base end portion of the main body and the lower surface of the first mounting member, respectively. The seismic isolation free access floor structure according to claim 1.

3. The second mounting member includes a buffer plate support portion extending horizontally along an upper surface of the panel support portion of the seismic isolation unit support leg, and a buffer plate mounting portion extending substantially parallel to the buffer plate support portion at a predetermined interval above the buffer plate support portion, the first mounting member is fixed to the buffer plate mounting portion of the second mounting member, The bottom of the base end of the main body is placed on the buffer plate support portion of the second mounting member.

3. The seismic isolation free access floor structure according to claim 1 or 2.

4. The main body of the shock absorber is manufactured by processing the floor panel.

4. The seismic isolation free access floor structure according to claim 1.

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