JP5456713B2 - Base-isolated floor structure - Google Patents

Description

  The present invention is, for example, a seismic isolation floor structure used for preventing building vibration and displacement due to an earthquake or the like from being directly transmitted to the equipment by performing a seismic isolation operation on the equipment installed on the upper surface. It is about.

  As a conventional base isolation floor structure, as shown in FIG. 8, there was a base isolation floor structure including a base isolation frame 4 arranged on a flat foundation floor surface 11 of a concrete slab. This seismic isolation frame 4 is used to prevent the vibration and displacement of the building due to an earthquake or the like from being directly transmitted to the free access floor 6 when the free access floor 6 is mounted thereon (patent) Reference 1).

  As shown in FIG. 9, the seismic isolation frame 4 having such a conventional base isolation floor structure has a frame 8 formed so as to extend in the length direction (vertical direction in the figure). In order to be substantially parallel to each other, a plurality of them were arranged side by side in the direction perpendicular to the length direction (left and right direction in the drawing).

  As shown in FIG. 9, the frame 8 of the seismic isolation frame 4 is connected to each other by connecting members 10 whose end portions in the length direction are formed in a U-shaped cross section as shown in FIG. It was possible to extend by extending in the length direction.

  As shown in FIG. 9, the connecting ribs 12 of the seismic isolation frame 4 have a plurality of connecting ribs 12 between the plurality of frames 8 such that the length direction extends in a direction substantially perpendicular to the length direction of the frame 8. Arranged side by side, the frame 8 and the connecting ribs 12 form a large number of lattice frames when viewed from above. The brace 14 of the seismic isolation frame 4 was disposed on one diagonal line of the lattice frame formed by the frame 8 and the connecting rib 12.

  The frame 8 of the seismic isolation frame 4 is formed with a plurality of protruding portions 8a protruding in a plate shape on its side portions at predetermined intervals in the length direction, and through holes formed in the protruding portions 8a. It was connected with the connection rib 12 and the brace 14 via connection members, such as a bolt which passes along.

  Then, the frame 8 of the seismic isolation frame 4 is provided with ball bearings 16 as shown in FIG. 10 at the lower part of the position at a constant interval in the length direction. Since these ball bearings 16 are configured to come into contact with the foundation floor 11 and roll, the seismic isolation frame 4 can freely move on the foundation floor 11 in any horizontal direction. .

  Further, the seismic isolation frame 4 having a conventional base isolation floor structure can be expanded by connecting similar members in both the vertical and horizontal directions in FIG.

  By installing dampers and coil springs (not shown) between the corners of the four corners of the entire seismic isolation frame 4 expanded in this way and the walls and corners of the room, vibrations of the building due to earthquakes, etc. The amount by which the seismic isolation frame 4 moves in the horizontal direction by absorbing the displacement can be reduced.

  Conversely, the damper or coil spring exerts a restoring force on the seismic isolation frame 4 that has moved in the horizontal direction relative to the wall of the room where the seismic isolation frame 4 is installed. It was possible to return to the original position relative to the wall.

  As shown in FIG. 11, the free access floor 6 can be placed on the seismic isolation frame 4. The free access floor 6 is arranged on the same horizontal plane above the seismic isolation frame 4 and a plurality of floor panels 18 arranged in line so as to be adjacent to each other vertically and horizontally as viewed from above, and the floor panel 18 It was comprised by the support leg 20 which supports from below.

  The support leg 20 of the free access floor 6 supports the four corners of the floor panel 18 whose planar shape is substantially square from the lower side, and the planar shape of the planar adjustment plate formed in a circular or rectangular shape. 20a and a leg portion 20b that is connected to the lower end portion of the panel adjustment base 20a on the same axis and has the lower end portion fixed to the frame 8 so as to stand upright from the upper surface 8b of the frame 8 of the seismic isolation frame 4. It was.

  According to the seismic isolation frame 4 having such a conventional seismic isolation floor structure, when the earthquake or the like occurs, the seismic isolation frame 4 moves in the horizontal direction. Instead of directly transmitting the displacement, it was possible to perform a seismic isolation operation after transmitting the vibration and displacement sufficiently.

Japanese Patent No. 4279075

  In the conventional seismic isolation floor structure in which the seismic isolation frame 4 is disposed on the foundation floor 11 and the free access floor 6 is installed on the seismic isolation frame 4 as shown in FIG. When a device or apparatus having such a large weight (hereinafter referred to as “devices”) is installed in a room, it is placed on the upper surface 18 a of the floor panel 18 of the free access floor 6.

  Such a device having a large weight can cause the seismic isolation frame 4 to swing when an earthquake or the like occurs simply by being placed on the upper surface 18a of the floor panel 18 of the free access floor 6 on the seismic isolation frame 4. May move or fall over the floor panel 18, and may be fixed to the floor panel 18.

  However, since the floor panel 18 may be removed from the support leg 20 in order to use the underfloor space below the floor panel 18 after the laying of the free access floor 6, the floor panel 18 is placed on the support leg 20. In general, a panel-free structure that can be detachably mounted on the panel has been adopted.

  In such a panel-free type free access floor 6, the floor panel 18 is merely placed on the support leg 20, so that the vibration and displacement of the building transmitted to the equipment due to an earthquake or the like are below the equipment. Even if it is reduced by the seismic isolation frame 4 located, the floor panel 18 to which the devices are fixed may be lifted from the support leg 20.

  Therefore, such a device having a large weight as described above cannot be prevented from moving or falling due to an earthquake or the like simply by being fixed to the floor panel 18 of the panel-free free access floor 6. was there.

  For this reason, when installing the above devices on the free access floor 6, for example, it is possible to adopt a panel fixing type structure in which the four corners of the floor panel 18 are fixed to the support legs 20. However, it is necessary to use a special floor panel that is not common and different from the panel-free floor panel 18, and in order to use the space under the floor panel 18 after laying, Since it is necessary to release the fixing of the panel 18 to the support leg 20, there is a problem that it takes time and effort.

  Further, when installing equipment on the floor panel 18, it is necessary to attach / detach the floor panel 18 for wiring of the equipment or to process the equipment to fix the equipment. As a result, there is a problem that the installation cost is increased.

  For this reason, it is conceivable to install the devices directly on the foundation floor surface 11 instead of installing them on the floor panel 18, but the foundation floor surface 11 with the seismic isolation frame 4 and the free access floor 6 is also considered. There was a problem that equipment could not be installed at the location.

  In addition, if a place without the seismic isolation frame 4 and the free access floor 6 is created and equipment is installed directly on the foundation floor surface 11 at that place, an exemption is provided between the equipment and the foundation floor surface 11. Since the seismic frame 4 is not provided, there is a problem that the equipment cannot receive the seismic isolation operation by the seismic isolation frame 4.

  In addition, when the equipment is installed on the seismic isolation frame 4, it is necessary to increase the strength of the frame 8, the connecting rib 12, and the brace 14 of the seismic isolation frame 4 in advance so as to withstand the weight of the equipment. As a result, there is a problem that the weight becomes heavier, and it is necessary to perform processing to fix the devices, so that installation is troublesome.

  Therefore, in view of the above problems, the present invention can prevent the devices arranged and fixed on the upper part thereof from moving or falling due to an earthquake or the like, and installing and removing the devices and installing the devices. It is an object of the present invention to provide a seismic isolation floor structure that can reduce the labor and cost required for the equipment and allows the devices to undergo a seismic isolation operation.

In order to solve the above problems, the seismic isolation floor structure according to the present invention is:
Equipment can be installed on the upper surface, and a seismic isolation part in contact with the foundation floor is provided in the lower part, and a plurality of angle members are combined to form a rectangular parallelepiped inside the line connecting the corners of the outer shape. A seismic isolation frame formed by a framework ;
A free access floor can be installed on the upper surface, a seismic isolation part in contact with the foundation floor surface is provided in the lower part, and a seismic isolation structure provided adjacent to the base isolation frame,
The end portion of the angle member protruding outward in the length direction of the base isolation frame is formed to be connected to the end portion of the base isolation structure adjacent to the base isolation frame by screw fastening. It is what.

Moreover, the seismic isolation floor structure according to the present invention is:
The seismic isolation part provided in the lower part of the base isolation frame is formed to be connected to the base isolation structure adjacent to the base isolation frame by screw fastening .

Moreover, the seismic isolation floor structure according to the present invention is:
The seismic isolation part has a low friction body such as a ball bearing.

According to such a base-isolated floor structure of the present invention,
Equipment can be installed on the upper surface, and the base is equipped with a base isolation base with a base isolation part in contact with the foundation floor.
It is possible to prevent equipment that is placed and fixed on the base of the base isolation floor structure from moving or toppling over due to an earthquake, etc., and reducing the labor and cost of installing and removing it and installing equipment And the equipment can be subjected to seismic isolation.

It is a front view which shows the base isolation frame 42 which comprises a part of base isolation floor structure 40 which concerns on one embodiment of this invention. It is a top view of the seismic isolation stand shown in FIG. It is an AA arrow directional cross-sectional view of the seismic isolation stand 42 shown in FIG. 4A and 4B are views showing one of the frame bodies 60 shown in FIG. 2, in which FIG. 4A is a top view, FIG. 4B is a side view, and FIG. 4C is a frame in FIG. FIG. It is a front view which shows the base isolation floor structure 40 which combined the base isolation frame 42 and the base isolation frame 24 shown in FIG. It is a top view of the seismic isolation floor structure 40 shown in FIG. It is a front view of the seismic isolation floor structure 40 combined with the free access floor 6. FIG. It is a front view which shows the seismic isolation frame 4 which is the conventional base isolation floor structure. It is a top view of the seismic isolation frame 4 shown in FIG. It is CC sectional view expanded sectional drawing in the seismic isolation frame 4 shown in FIG. It is a front view of the seismic isolation frame 4 combined with the free access floor 6. FIG.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the seismic isolation floor structure which concerns on this invention is demonstrated concretely based on drawing.

  FIGS. 1-7 is a figure referred in order to demonstrate the seismic isolation floor structure 40 which concerns on one embodiment of this invention. In the seismic isolation floor structure 40 shown in these drawings, the same parts as those in the conventional base isolation floor structure are denoted by the same reference numerals, and overlapping description of the same configuration as the conventional one is omitted except for a part. It shall be.

  As shown in FIG. 1, a base isolation floor structure 40 according to an embodiment of the present invention has a base isolation base 42 disposed on a flat foundation floor surface 11 of a concrete slab. Each of the plurality of ball bearings 46 (low friction bodies) of the seismic isolation portion 44 provided in the lower portion can come into contact with the foundation floor 11 and roll.

  As shown in FIGS. 1 to 3, the base isolation frame 42 of the base isolation floor structure 40 is made of steel and includes angle members 48, 50, 52, 54, 56 (long members) having an L-shaped cross section. It is combined so as to extend in three directions of length, width and height, and the parts that contact each other are fixed by screw fastening or welding, so that the inside of the line connecting the corners of the outer shape is a rectangular parallelepiped It is formed by the framework which becomes.

  That is, as shown in FIGS. 1 to 3, the base isolation frame 42 of the base isolation floor structure 40 is formed by combining angle members 48, 50, 52 and has a substantially rectangular shape having a length in the vertical direction in FIG. 2. A frame body 60 as shown in FIGS. 4A to 4C is formed.

  As shown in FIG. 2, the frame body 60 is arranged along the length direction (vertical direction in the figure) of the seismic isolation frame 42, and in the vertical center of the two upper and lower frame bodies 60 in the figure. A pair of angle members 52 provided at each of the adjacent end portions are in contact with each other, and the two frame bodies 60 are connected to each other in the length direction by screwing or welding the contact portions. It is like that.

  The plurality of frame bodies 60 are arranged side by side at intervals in the left-right direction in the figure so that the length directions thereof are parallel to each other.

  The frame body 60 of the seismic isolation frame 42 includes a lower angle member 48 as shown in FIGS. 1, 3, and 4 (c), and an upper portion disposed so that the cross section is symmetrical above the lower angle member 48. The angle member 50 and a connecting angle member 52 as described below are combined.

  That is, as shown in FIGS. 1, 3, and 4 (c), the connecting angle member 52 has an end face 48 a on the lower angle member 48 and a downward face on the upper angle member 50 at both ends in the length direction. The lower angle member 48 and the upper angle member 50 are provided so as to be connected in the vertical direction in the figure by being abutted against the surface 50a and being fixed by welding.

  As shown in FIG. 1 to FIG. 3, the seismic isolation frame 42 has a connection angle member 54 that connects one end portions of three frame bodies 60, and the length direction of the connection angle member 54 is a frame body. It is arranged so as to extend in a direction substantially perpendicular to the length direction of 60.

  At this time, the cross-section of the connecting angle member 54 has two sides of an inverted L shape on the front end surface of each end in the length direction of the frame body 60 arranged at the upper and lower ends of the base isolation frame 42 in FIG. The outer surface of the side which has a width | variety in the up-down direction in FIG. 1 contacts in one side, and is fixed by welding.

  And the base isolation frame 42 has the connection angle member 56 which connects the other end parts of the three frame bodies 60, as shown in FIG. 2, As for this connection angle member 56, the length direction is a frame. It is disposed between adjacent frame bodies 60 so as to be in a direction substantially perpendicular to the length direction of the body 60.

  At this time, both ends in the length direction of the connection angle member 56 are in contact with the inner side surface of the side parallel to the length direction of the frame body 60 among the two L-shaped sides of the connection angle member 52, or One of the both ends contacts the inner surface of the same side of the two L-shaped sides of the connecting angle member 52, and the other contacts the outer surface of the side of the upper angle member 50 in the vertical direction in FIG. In this state, it is fixed by welding.

  In FIG. 2, among the plurality of frames 60 of the base isolation frame 42, on the outer vertical surface of the upper angle member 50 of the frame body 60 positioned at both ends in the width direction (left and right direction in the drawing) of the base isolation frame 42. As shown in FIG. 3, the outer vertical surface of the mounting angle member 58 whose section is arranged in an inverted L shape comes into contact and is fixed by welding.

  The seismic isolation frame 42 has seismic isolation parts 44 as shown in FIGS. 1 and 3 at the positions of the bottom surface of the lower angle member 48 of the frame body 60 at regular intervals in the length direction. It can be installed. These seismic isolation parts 44 are configured such that a ball bearing 46 provided in the lower part thereof comes into contact with the foundation floor surface 11 and rolls. Can also move freely.

  As shown in FIGS. 5 and 6, a seismic isolation frame 24 (a seismic isolation structure) is disposed around the base isolation frame 42 in the horizontal direction. A ball bearing 16 provided in the lower part of the ball bearing 16 can come into contact with the foundation floor surface 11 and roll. For this reason, the seismic isolation frame 24 can move freely on the foundation floor 11 in any horizontal direction.

  Such a seismic isolation frame 24 has the same configuration as the conventional seismic isolation frame 4 except that a space in which the base isolation frame 42 is disposed is formed in the center. . For example, as in the conventional seismic isolation frame 24, a damper or a coil spring (not shown) is attached between the corners of the four corners and the walls of the room or the corners of the seismic isolation frame 24. ing.

  As shown in FIG. 5 and FIG. 4C, in the base isolation frame 42, the height of the upward surface 48 a of the lower angle member 48 of the frame body 60 is substantially equal to the height of the upper surface 8 b of the frame 8 of the base isolation frame 24. It is the same.

  Then, as shown in FIG. 6, a plate-like plate 62 that spans from the upper surface 48 a of the end of the lower angle member 48 projecting outward in the length direction from the frame body 60 to the upper surface 8 b of the frame 8. Both ends are integrally fixed to the lower angle member 48 and the frame 8 with bolts or the like, so that the base isolation frame 42 is connected to the base isolation frame 24.

  As a result, the seismic isolation frame 42 is disposed in the central space of the seismic isolation frame 24 and is fixed to the seismic isolation frame 24, and both of these freely move freely on the foundation floor 11 in any horizontal direction. Be able to.

  Further, as shown in FIG. 1, the seismic isolation part 44 of the base isolation frame 42 is formed with a protruding part 44a projecting in a plate shape on its side part, and as shown in FIG. It is connected to the connecting rib 12 and the brace 14 connected to the seismic isolation frame 24 through a connecting member such as a bolt passing through a through hole formed in 44a.

  In FIG. 6, the illustration of the mounting angle member 58 and the connection angle member 54 of the seismic isolation frame 42 is omitted for the convenience of description of the configuration of the seismic isolation floor structure 40.

  Since the base isolation frame 42 is detachably fixed to the base isolation frame 24, the base isolation frame 42 is arranged in the center of the base isolation frame 24 even after the base isolation frame 24 is installed. By providing such a space, the base isolation frame 42 can be arranged in the center of the base isolation frame 24, and the base isolation frame 24 can be attached to and detached from the base isolation frame 42.

  Conversely, even after the base isolation frame 42 is installed, the base isolation frame 24 can be attached to and removed from the base isolation frame 42.

  In addition, each of the protrusions 44a projecting toward the center of the base isolation frame 42 of the base isolation frame 44 hidden behind the frame body 60 of the base isolation frame 42 shown in FIG. Are connected to the connecting ribs 12 and the braces 14 that are not connected to the seismic isolation frame 24 via connecting members such as bolts passing through the base.

  Further, the base isolation frame 42 is formed in a rectangular parallelepiped shape, and the base isolation frame 24 can be attached by the plate 62, the connecting rib 12 and the brace 14, so that the base isolation frame 42 is installed on the base isolation frame 42. When wiring the equipment to be used, parts other than the framework are not hindered.

  Moreover, since the seismic isolation frame 42 can be comprised only with the frame body 60 arrange | positioned in parallel, the member which connects frame bodies 60, and the seismic isolation part 44 provided in the lower part, The number of parts can be reduced and the weight can be reduced.

  Further, as shown in FIG. 7, the free access floor 6 is placed on the frame 8 of the seismic isolation frame 24 around the base isolation frame 42 in the horizontal direction, and the lower ends of the support legs 20 of the free access floor 6. The portion is fixed on the upper surface 8 b of the frame 8 of the seismic isolation frame 24.

  At this time, the connection angle member 54 and the mounting angle member 58 fixed to the outer periphery in the horizontal direction of the base isolation frame 42 are free on the upper surface of the horizontal side of the two sides of the inverted L-shaped cross section. The lower surface of the floor panel 18 of the access floor 6 can be placed, and the base isolation frame 42 and the free access floor 6 can be integrated so that there is no gap between them.

  At this time, as shown in FIG. 7, the height of the upper surface of the upper angle member 50 of the frame body 60 of the base isolation frame 42 is the upper surface 18 a of the floor panel 18 of the free access floor 6 fixed on the base isolation frame 24. Since the height is substantially the same, the upper surfaces thereof are arranged on the same horizontal plane.

  Further, on the upper surface of the connection angle member 54 and the mounting angle member 58 of the seismic isolation frame 42, the lower surface of the floor panel 18 of the free access floor 6 is brought into contact with and fixed to the support leg of the free access floor 6 below. Since there is no need to provide 20, the number of parts can be reduced.

  On such a base isolation frame 42 of the base isolation floor structure 40, the above-mentioned large and heavy equipment can be placed and fixed. It is not designed to be placed on the access floor 6.

  As described above, according to the base isolation floor structure 40 according to the present embodiment, large and heavy equipment is not placed on the base isolation frame 24 or the free access floor 6. Since it is not necessary to increase the strength of the frame 8 of the seismic isolation frame 24, the connecting rib 12, the brace 14, and the floor panel 18 and the support leg 20 of the free access floor 6, the weight can be increased by increasing the strength thereof. It can prevent becoming heavy.

  In addition, since the above-described devices can be mounted and fixed on the seismic isolation frame 42, when the earthquake occurs, the seismic isolation frame 42 is transmitted to the devices by performing the seismic isolation operation. The vibration and displacement are reduced, and the seismic isolation gantry 42 can be prevented from moving or overturning with respect to the seismic isolation gantry 42 by swinging the seismic isolation gantry 42.

  Further, it is not necessary to attach and detach the floor panel 18 when mounting the above-described devices, and it is not necessary to perform processing for installing the devices on the floor panel 18, so that it takes time and effort. Since there is no such thing, the cost for installing the equipment can be reduced.

  In addition, the above-mentioned devices can be placed on the base isolation frame 42, and the base isolation surface 42 is provided with the ball bearing 46 between the base floor surface 11, so that The equipment can sufficiently receive the seismic isolation operation by the seismic isolation rack 42.

  Further, since the seismic isolation frame 42 has a structure having a sufficient opening portion between the rectangular parallelepiped frames, it is possible to wire devices using the opening portion. It is not necessary to provide a large hole, and it is possible to prevent troublesome processing.

  In addition, although the base isolation frame 42 in the base isolation floor structure 40 which concerns on the said embodiment was arrange | positioned on the flat foundation floor surface 11 of a concrete slab, it replaced with metal, such as a stainless steel plate. A plate made of concrete may be laid on the concrete slab, and the base plate may be a smooth surface on the upper surface of the stainless steel plate or the like, and the seismic isolation frame 42 or the like may be disposed thereon.

  By using the smooth surface of the upper surface of a metal plate such as a stainless steel plate as the foundation floor surface, it is possible to easily provide a foundation floor surface that is smoother than the upper surface of the concrete slab, and to eliminate the seismic isolation frame 42. The ball bearing 46 provided in the lower part of the seismic part 44 can be rolled more smoothly than in the case of a concrete slab.

  In addition, the base isolation frame 42 in the base isolation floor structure 40 according to the embodiment described above is provided with the ball bearing 46 at the lower part thereof, but the friction with respect to the foundation floor can be reduced. If so, a low friction body other than the ball bearing 46 may be provided.

  In addition, the base isolation frame 42 in the base isolation floor structure 40 according to the above embodiment has the base isolation part 44 having a structure capable of performing base isolation in the horizontal direction. In addition to the vertical direction, the structure may have a seismic isolation part capable of performing a seismic isolation operation.

  The base isolation frame 42 in the base isolation floor structure 40 according to the embodiment includes two frame bodies 60 connected in the length direction and arranged perpendicular to the length direction. Are arranged side by side so as to be substantially parallel to each other, but the frame bodies 60 are arranged side by side without being connected to each other in the length direction. Alternatively, three or more frame bodies 60 may be arranged side by side in a state of being connected in the length direction.

  Further, in the base isolation frame 42 in the base isolation floor structure 40 according to the embodiment, the height of the upper surface 48a of the lower angle member 48 of the frame 60 is equal to the height of the upper surface 8b of the frame 8 of the base isolation frame 24. Although they are substantially the same and are fixed integrally to the frame 8 with bolts or the like via a plate-like plate 62 spanned over them, the seismic isolation frame 42 and the seismic isolation frame If it can connect with 24, it will not be limited to this embodiment.

  For example, the height of the upward surface 48a of the lower angle member 48 of the frame body 60 of the base isolation frame 42 may not be substantially the same as the height of the upper surface 8b of the frame 8 of the base isolation frame 24. The bottom surface of the lower angle member 48 of the frame body 60 of the base isolation frame 42 may be fixed in direct contact with the upper surface 8 b of the frame 8 of the base isolation frame 24 without using the plate 62.

  Further, in the base isolation frame 42 in the base isolation floor structure 40 according to the above-described embodiment, the base isolation part 44 is formed with a protruding part 44a projecting in a plate shape on the side part, and the protrusion part 44a. The base is connected to the connecting rib 12 and the brace 14 connected to the seismic isolation frame 24 via a connecting member such as a bolt passing through the through hole formed in the base. As long as it is connected to 24, the protrusion 44 a does not have to be formed in the seismic isolation portion 44. Moreover, it does not need to be connected with the connection rib 12 and the brace 14 of the seismic isolation frame 24.

  Further, the seismic isolation frame 42 need not be limited to the configuration according to the above-described embodiment, and any other configuration of the seismic isolation frame 42 can be used as long as it is configured to receive the effects of the present invention. A shaking rack may be used.

  Further, in the base isolation floor structure 40 according to the above-described embodiment, a damper is provided between the corners of the four corners of the base isolation frame 24 and the walls of the room or the corners thereof, as in the conventional base isolation floor structure. And a coil spring can be attached, but by using a structure that enables it between the corners of the four corners of the base isolation frame 42 and the base isolation frame 24 arranged outside thereof, A damper or a coil spring may be attached.

DESCRIPTION OF SYMBOLS 4 Seismic isolation frame 6 Free access floor 8 Frame 8a Protrusion part 8b Upper surface 10 Connection member 11 Foundation floor surface 12 Connection rib 14 Brace 16 Ball bearing 18 Floor panel 18a Upper surface 20 Support leg 20a Panel adjustment stand 20b Leg part 24 Isolation frame 40 Base isolation structure 42 Base isolation base 44 Base isolation 44a Protrusion 46 Ball bearing 48 Lower angle member 48a Upward surface 50 Upper angle member 50a Downward surface 52 Connection angle member 54, 56 Connection angle member 58 Mounting angle member 60 Frame 62 plate

Claims (3)

Equipment can be installed on the upper surface, and a seismic isolation part in contact with the foundation floor is provided in the lower part, and a plurality of angle members are combined to form a rectangular parallelepiped inside the line connecting the corners of the outer shape. A seismic isolation frame formed by a framework ;
A free access floor can be installed on the upper surface, a seismic isolation part in contact with the foundation floor surface is provided in the lower part, and a seismic isolation structure provided adjacent to the base isolation frame,
The end portion of the angle member protruding outward in the length direction of the base isolation frame is formed to be connected to the end portion of the base isolation structure adjacent to the base isolation frame by screw fastening. Seismic isolation floor structure. The said seismic isolation part provided in the lower part of the said base isolation frame was formed so that it might be connected with the said base isolation structure adjacent to the said base isolation frame by screw fastening. Seismic isolation floor structure.   The base isolation floor structure according to claim 1 or 2, wherein the base isolation part has a low friction body such as a ball bearing.

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