JP5675736B2 - Base-isolated floor structure - Google Patents

Description

  The present invention relates to a base-isolated floor structure that is used for a floor structure such as a free access floor and performs a base-isolating operation against vibrations and displacement of a building caused by an earthquake or the like.

  As a conventional base-isolated floor structure, as shown in FIG. 18, there is a base-isolated floor structure 2 in which a flat base floor surface 3 is formed on a concrete slab and is arranged on the base floor surface 3. In this seismic isolation floor structure 2, the ball bearing 4 is provided so as to be horizontally movable with respect to the foundation floor surface 3, so that horizontal vibration and displacement of the building caused by an earthquake or the like are generated on the ball bearing 4. It is possible to prevent transmission directly to the floor plate 6 fixed to the floor, a free access floor disposed on the floor plate 6 or the like (see Patent Document 1).

  The ball bearing 4 of the conventional seismic isolation floor structure 2 is shown in FIG. 18 in a vertical cross section between the convex spherical surface portion 10a formed on the ball seat 10 and the concave spherical surface portion 12a formed on the ball guide 12. And a gap S formed in an annular shape in a horizontal cross section (not shown) is provided so that the gap S can be guided so as to circulate and roll the ball body 8 passing through the gap S. It was.

  Then, the ball guide 12 having the gap S as described above and the flat floor plate 6 fixed on the upper surface 12b screw the male screw portion of the bolt 14 and the female screw portion 12c of the ball guide 12 to each other. By fastening, they were consolidated together.

  A free access floor (not shown) is placed on the upper surface 6a of the floor board 6 and is fixed to the floor board 6 by a fixing means (not shown).

  When the ball bearing 4 moves horizontally with respect to the foundation floor surface 3, the conventional seismic isolation floor structure 2 as described above is positioned on the opposite side of the bottom side 10b of the ball seat 10 from the side where the horizontal movement proceeds. The ball body 8 that has been moved enters the gap S and circulates and rolls, and the ball body 8 that has been positioned on the side of the horizontal movement moves toward the side opposite to the side of the movement. It was.

  For this reason, when the ball bearing 4 is horizontally moved along the foundation floor surface 3, the large number of ball bodies 8 circulate and roll following the horizontal movement. By operating 8 in this way, the floor board 6 and the free access floor thereon can move freely on the foundation floor 3 in any direction within a substantially horizontal plane.

  In addition, the conventional seismic isolation floor structure 2 is supported on the foundation floor surface 3 via a large number of ball bodies 8, and each of the ball bodies 8 can exert a supporting force. The vertical load that can be supported by one can be increased.

JP 2000-266115 A

  However, since the conventional seismic isolation floor structure 2 has a structure in which a plurality of ball bearings 4 are horizontally fixed below the floor plate 6, the foundation floor surface 3 has a height higher than most other parts depending on the location. When there are different portions, there is a problem that the ball bodies 8 of some of the ball bearings 4 cannot be grounded to the foundation floor 3 uniformly.

  For this reason, the horizontal vibration and displacement of the building caused by an earthquake or the like are directly transmitted to the floor board 6 fixed on the ball bearing 4 or the free access floor fixed on the floor board 6 as it is. There was a problem that the seismic isolation operation which effectively prevents the seismicity could not be performed sufficiently.

  Moreover, as a means to the said problem, the base floor surface 3 is formed in the flat surface without a level difference, or the seismic isolation operation | movement arrange | positioned on the base floor surface 3 of a part with a different height from another part is carried out. Instead of the ball bearings 4 that cannot be sufficiently performed, it is considered to increase the number of ball bearings 4 that can sufficiently perform the seismic isolation operation on the foundation floor surface 3 other than the portions different in height from the other portions. However, these means have a problem that much labor and cost are required and the number of ball bearings 4 is increased, resulting in an increase in price.

  Therefore, in view of the above problems, the present invention has a simple structure and can reduce material costs and manufacturing costs. It is an object of the present invention to provide a seismic isolation floor structure capable of sufficiently performing an effective seismic isolation operation equivalent to the case where there are no portions having different heights on the floor surface.

In order to solve the above problems, the seismic isolation floor structure according to the present invention is:
In the seismic isolation floor structure having a base isolation frame having a plurality of frames and a plurality of base isolation support parts for supporting the base isolation frame,
The seismic isolation support part includes a ball bearing placed on a foundation floor, a plate-like member connected to the seismic isolation frame, one end fixed to the ball bearing, and the other end extending upward. An engagement rod member that is inserted into a through-hole formed in the plate-like member so as to be engageable,
The other end of the engaging Gobo member, which said base floor and in response to changes in the spacing of the plate-like member, characterized in that it disengaged from or the upper surface on the upper surface of the plate-like member It is.

Moreover, the seismic isolation floor structure according to the present invention is:
The seismic isolation support portion includes a connecting member that connects the frames arranged so that their ends face each other,
The plate-like member is connected to the lower surface of the connecting member with its upper surface contacting,
The engagement bar member is a bolt;
The male screw portion of the bolt is inserted into the through hole of the plate-like member, and the tip portion protruding downward of the plate-like member is screwed to the upper surface of the ball bearing,
A diameter dimension of the through hole of the plate-like member is larger than a diameter dimension of the male screw portion of the bolt and smaller than a diameter dimension of the head portion of the bolt .

Moreover, the seismic isolation floor structure according to the present invention is:
The seismic isolation support part includes a connecting member that connects the frames arranged so that their ends face each other, and a base isolation leg part placed on the foundation floor surface,
The connecting member has a rising plate portion formed so as to rise upward between the frames in which the respective end portions are opposed to each other,
The seismic isolation leg portion is arranged below the raised plate portion.

According to such a base-isolated floor structure of the present invention,
In the seismic isolation floor structure having a base isolation frame having a plurality of frames and a plurality of base isolation support parts for supporting the base isolation frame,
The seismic isolation support part includes a ball bearing placed on a foundation floor, a plate-like member connected to the seismic isolation frame, one end fixed to the ball bearing, and the other end extending upward. An engagement rod member that is inserted into a through-hole formed in the plate-like member so as to be engageable,
The ball bearing engages or disengages from the plate-like member according to a change in the distance between the base floor surface and the plate-like member while the engagement rod member is inserted through the through hole of the plate-like member. By
The structure of the seismic isolation floor structure is simple, and material costs and manufacturing costs can be reduced, and even if the foundation floor surface has different heights depending on the location, the foundation floor surface has different heights. The seismic isolation operation that is as effective as when there is no is possible.

It is a partially broken side view which shows the seismic isolation floor structure 40 which concerns on the 1st Embodiment of this invention. FIG. 3 is a top view of a wide range of the base isolation floor structure 40 showing a plurality of base isolation support parts 44 by reducing the base isolation floor structure 40 shown in FIG. 1. It is a partial top view of the periphery of the connecting member 52 of the base isolation floor structure 40 shown in FIG. FIG. 4 is a top view of only the connecting member 52 shown in FIG. 3. It is a side view of the connection member 52 shown in FIG. It is a side view of the seismic isolation support part 44 shown excluding the connection member 52. FIG. It is a side view which shows the state which fixed the plate-shaped member 54 and the support bar member 56 mutually. FIG. 8 is a partially sectional bottom view of the plate-like member 54 and the support bar member 56 shown in FIG. 7. It is a figure which shows the ball bearing 60, Comprising: It is AA arrow sectional drawing of the ball bearing 60 shown in FIG. FIG. 10 is a top view of the ball bearing 60 shown in FIG. 9. It is the seismic isolation support part 44 shown except the connection member 52 similarly to FIG. 6, Comprising: It is a side view which shows the state mounted on the foundation floor surface 41 whose height is lower than another part. It is a partially broken side view which shows the base isolation floor structure 80 which concerns on the 2nd Embodiment of this invention. It is a side view of the seismic isolation support part 82 shown excluding the connection member 52. FIG. FIG. 13 is a view showing a state in which the support rod member 86 and the first round bar member 88 are fixed to the first plate member 84, and the second round bar member 92 is fixed to the second plate member 90. It is a side view which shows a viewpoint rotated 90 degree | times within a horizontal surface. FIG. 15 is a partial cross-sectional top view of the first plate member 84, the support bar member 86, the first round bar member 88, the second plate member 90, and the second round bar member 92 shown in FIG. It is the seismic isolation support part 82 shown except the connection member 52 similarly to FIG. 13, Comprising: It is a side view which shows the state mounted on the foundation floor surface 41 whose height is lower than another part. FIG. 14 is a side view showing the seismic isolation support portion 82 except for the connecting member 52 as in FIG. 13, which is placed on the inclined foundation floor surface 41. It is side surface sectional drawing which shows the conventional seismic isolation floor structure.

  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 to 11 are views referred to for explaining the seismic isolation floor structure 40 according to the first embodiment of the present invention.

  The seismic isolation frame 42 of the base isolation floor structure 40 according to the present embodiment includes a frame 46, a cover 48, and a connecting frame 50 as shown in FIG. 2, and as shown in FIG. It is arranged away from the upper side.

  As shown in FIG. 1, the seismic isolation floor structure 40 includes a seismic isolation support 44. The seismic isolation support 44 mainly includes a connecting member 52, a plate-shaped member 54, a support bar member 56, a bolt. 58 (engagement rod member) and ball bearings 60 are arranged on the foundation floor 41 and support the seismic isolation frame 42 from below.

  Here, the other components excluding the connecting member 52 from the seismic isolation support portion 44, that is, the plate member 54, the support bar member 56, the bolt 58, and the ball bearing 60 are collectively referred to as a seismic isolation leg portion.

  As shown in FIG. 2, the seismic isolation frame 42 has a plurality of frames 46 arranged in the length direction (left and right direction in the drawing) and in a substantially parallel direction to each other. It arrange | positions at intervals in the direction (up-down direction in a figure).

  The frame 46 shown in FIG. 3 is formed in the shape of a square cylinder having a hollow portion 46a therein, and the two frames 46 that are adjacent in the length direction of the frame 46 have a cover 48 and a connecting member 52, respectively. It is sandwiched from above and below between the flat plate portions 52a, and the opening end portions of each other are arranged to face each other and connected.

  The cover 48 has a cross-sectional shape (not shown) formed in a U shape with an opening below the base floor surface 41, and as shown in FIGS. It arrange | positions so that the three outer surfaces of the upper and both sides of each opening end part which the two frames 46 which oppose may mutually overlap may be covered.

  The connecting frame 50 extends in the left-right direction in FIG. 2, and between the side portions of the plurality of covers 48 arranged in parallel with each other, the length direction of the connecting frame 50 is substantially perpendicular to the length direction of the frame 46. Is arranged.

  As shown in FIG. 3, the connection frame 50 is formed in a rectangular tube shape having a hollow portion 50 a, and the end portions of the two connection frames 50 adjacent to each other in the length direction are connected to the connection member. 52 is fixed on the flat plate portion 52a, and the opening end portions thereof are arranged to face each other across the cover 48 in the length direction.

  As shown in FIG. 4, the connecting member 52 has four sides that are formed between the notches 52 d adjacent to each other, with cutouts 52 d formed at the four corners of the flat plate 52 a having a substantially square outer shape. The plate-like portion extending further outward in the vertical and horizontal directions is formed in a bent plate portion 52e (see FIG. 5) that is bent substantially perpendicularly toward the back side of the drawing sheet.

  A total of twelve screw holes 52c are formed in the flat plate portion 52a of the connecting member 52 along each of the four sides.

  In the central portion of the flat plate portion 52a of the connecting member 52, two long holes 52f that are separated from each other in the vertical direction and have a length in the horizontal direction in the drawing are formed in parallel with each other. Yes. Then, the portion sandwiched between the two long holes 52f of the flat plate portion 52a rises above the flat plate portion 52a (to the front side in FIG. 4) by a press or the like, and has two slopes as shown in FIG. A raised plate portion 52h having an upper surface 52i substantially parallel to the portion 52g and the upper surface 52b of the flat plate portion 52a is formed.

  As shown in FIG. 4, the rising plate portion 52h at the center of the connecting member 52 is formed with a through hole 52j penetrating in the plate thickness direction, and 4 so as to surround the through hole 52j. Two through holes 52k are formed.

  As shown in FIG. 1, the frame 46 is formed with through holes 46 b penetrating the upper plate portion and the lower plate portion in the vicinity of the opening end portion of the frame 46. Further, at both ends of the cover 48, through holes 48a are formed at positions that overlap with the through holes 46b on the upper side of the frame 46 in the figure when the respective open end portions of the pair of frames 46 are covered. .

  In the frame 46 and the cover 48, the male screw portion of the bolt 47 is inserted through the through holes 46 b and 48 a (see FIG. 3), and the tip of the male screw portion is inserted into the screw hole 52 c (see FIG. 4) of the connecting member 52. By being fastened with screws, it is fixed to the flat plate portion 52 a of the connecting member 52. The connecting frame 50 is also fixed to the flat plate portion 52a of the connecting member 52 in substantially the same manner.

  As shown in FIGS. 1 and 3, the male thread portion 56a of the support rod member 56 is inserted from the lower side in FIG. 1 into the through hole 52j of the raised plate portion 52h (see FIG. 4), and then the male thread portion 56a has a nut. 62 is fastened with screws, but the support bar member 56 is integrally fixed to the plate-like member 54 as will be described later, so that the plate-like member is formed on the lower surface 52m of the raised plate portion 52h (see FIG. 5). The support bar member 56 is fixed to the raised plate portion 52h by bringing the upper surface 54a of the contact 54 into contact and fastening with the screws.

  As shown in FIG. 8, the outer shape of the plate-like member 54 is formed in a substantially square shape, and through holes 54c are formed near the four corners. The through hole 54c is formed at a position coaxial with the through hole 52k (see FIG. 4) of the connecting member 52 when the plate-like member 54 is superimposed on the raised plate portion 52h from below. The diameter dimension is smaller than that of the through hole 52k.

  As shown in FIG. 7, the plate-like member 54 has a corner between the upper surface 54 a and the outer peripheral surface of the support bar member 56 by inserting the support bar member 56 through a through hole 54 d formed at the center thereof. Are integrally formed with the support bar member 56.

  The support rod member 56 has a male screw portion 56a formed on the outer periphery of a portion protruding upward from the upper surface 54a of the plate-like member 54 in FIG. In addition, a convex spherical surface portion 56 c is formed at the tip end portion of the columnar protruding portion 56 b that protrudes downward from the lower surface 54 b of the plate-like member 54 of the support bar member 56.

  In FIG. 6, the convex spherical portion 56 c at the tip of the protruding portion 56 b at the lower end of the support bar member 56 is in contact with the upper surface 74 a of the ball guide 74 of the ball bearing 60.

  The male screw portion 58 a of the bolt 58 is inserted into the through hole 54 c from the upper surface 54 a side of the plate-like member 54, and the tip portion protruding downward of the plate-like member 54 is the upper surface of the ball guide 74 of the ball bearing 60. The screw 74 is fastened to four internal thread portions 74 c as shown in FIG. 10 and fixed to the ball bearing 60.

  The plate-like member 54 is configured such that the lower surface of the head of the bolt 58 is engaged with or detached from the upper surface 54a of the plate-like member 54 in accordance with a change in the distance from the foundation floor 41. Are loosely connected to the ball bearing 60 with play.

  That is, as shown in FIG. 6, when the distance between the base floor 41 and the lower surface 54b of the plate-like member 54 is shortened and the head lower surface of the bolt 58 and the upper surface 54a of the plate-like member 54 are separated, The bearing 60 is not engaged (separated) with the plate member 54 via the bolt 58.

  On the other hand, when the space between the foundation floor 41 or the ball bearing 60 and the lower surface 54b of the plate-like member 54 is widened so that the lower surface of the head of the bolt 58 and the upper surface 54a of the plate-like member 54 come into contact, the ball bearing 60 It will be in the state engaged with the plate-shaped member 54 via the volt | bolt 58. FIG.

  Therefore, the bolt 58 is normally spaced from the upper surface 54 a of the plate-like member 54 when the tip of the male screw portion 58 a is screwed to the female screw portion 74 c of the ball guide 74. Although the length is such that it faces each other, the height of a part of the foundation floor 41 is lower than the other part of the foundation floor 41, so that the height of the ball guide 74 of the ball bearing 60 is increased. Is lowered from the other ball bearing 60, the lower surface of the head of the bolt 58 comes into contact with the upper surface 54a of the plate member 54, and the ball guide 74 and the plate member 54 are in the most separated state.

  By the way, as shown in FIG. 1, the head portion of the bolt 58 has a raised plate portion 52 h (see FIGS. 4 and 5) of the connecting member 52 in a state where the male screw portion 58 a is inserted into the through hole 54 c of the plate-like member 54. ) Is inserted into the through hole 52k from below and assembled.

  When the ball bearing 60 and the bolt 58 are rotated by a predetermined angle with respect to the support rod member 56 depending on the state of the foundation floor surface 41, the head of the bolt 58 is prevented from contacting the inner peripheral surface of the through hole 52k. The through hole 52k (see FIGS. 4 and 5) of the ascending plate portion 52h is formed to have a diameter larger than the diameter of the head of the bolt 58.

  Similarly to the through hole 52k of the raised plate portion 52h, when the ball bearing 60 and the bolt 58 are rotated by a predetermined angle with respect to the support bar member 56 depending on the state of the foundation floor surface 41, the male screw portion 58a of the bolt 58. The through hole 54c of the plate-like member 54 is formed to have a larger diameter than the diameter of the male threaded portion 58a of the bolt 58 so that the inner diameter of the through hole 54c does not contact the inner peripheral surface of the through hole 54c.

  The plate-like member 54 and the ball bearing 60 are engaged or disengaged from each other via the bolts 58 as described above. Therefore, the upper surface 74a of the ball bearing 60 is allowed to rotate to a predetermined angle with respect to the substantially stationary support rod member 56.

  Further, since the lower surface of the head of the bolt 58 is engaged with or detached from the upper surface 54 a of the plate-like member 54, the lower surface of the head of the bolt 58 is engaged with the upper surface 54 a of the plate-like member 54. Except at times, the bolt 58 can freely move up and down in the axial direction with respect to the plate-like member 54.

  For this reason, the base floor surface 41 on which an arbitrary seismic isolation support portion 44 among the plurality of seismic isolation support portions 44 that support the seismic isolation frame 42 in FIG. When the height position is lower than the placed foundation floor surface 41, the bolt 58 moves downward with respect to the plate-like member 54, and the upper surface 74 a of the ball bearing 60 is changed to the lower surface 54 b of the plate-like member 54. Since the height of the ball 70 is lowered so as to widen the distance from the base, it is possible to make all the balls 70 uniformly contact the base floor 41.

  As shown in FIG. 9, the ball bearing 60 includes a large number of ball bodies 70, a ball seat 72, and a ball guide 74. The ball bearing 60 can guide the ball body 70 to circulate and roll through the gap S formed between the ball seat 72 and the ball guide 74.

  The ball seat 72 is formed in a disc shape having a convex spherical surface portion 72b on its outer peripheral portion, and a cylindrical portion 72a protruding upward in the figure is integrally formed at the upper center portion thereof. The cylindrical portion 72a has a smaller outer diameter than the convex spherical portion 72b, and four female screw portions 72e are formed on the upper surface 72c.

  The ball guide 74 is formed in a substantially cylindrical shape, and a concave spherical surface portion 74e corresponding to the convex spherical surface portion 72b of the ball sheet 72 is formed inside thereof. An opening of a concave spherical surface portion 74e is formed on the bottom surface 74b of the ball guide 74, and a step recess 74g that is recessed upward in FIG. 9 is formed above the opening.

  Then, four counterbore holes 74d penetrating from the upper surface 74a to the ceiling surface of the stepped recess 74g are formed at the center of the upper surface 74a of the ball guide 74.

  The cylindrical portion 72a of the ball seat 72 is fitted to the inner side in the horizontal direction of the step concave portion 74g of the ball guide 74, and the male screw portion 76a of the countersunk screw 76 is inserted into the center portion of the counterbore hole 74d of the ball guide 74, The ball guide 74 is fixed to the ball sheet 72 by fastening the portion to the female screw portion 72 e of the ball sheet 72.

  At this time, between the concave spherical surface portion 74e of the ball guide 74 and the convex spherical surface portion 72b of the ball seat 72, a curved gap S as shown in FIG. Is formed. The central portion of the gap S in the ball guide 74 is formed in an annular shape in a horizontal cross section (not shown).

  Further, a dimensional difference shorter than the outer diameter dimension of the ball body 70 between the height of the bottom surface 74 b of the ball guide 74 from the basic floor surface 41 and the height of the bottom surface 72 d of the ball seat 72 from the basic floor surface 41. Is provided.

  For this reason, when the ball body 70 is spread on the base floor surface 41 below the bottom surface 72 d of the ball sheet 72, a part of the ball body 70 sandwiched between the bottom surface 72 d of the ball sheet 72 and the base floor surface 41. Is arranged to be exposed below the bottom surface 74 b of the ball guide 74.

  The ball body 70 is not only below the bottom surface 72d of the ball sheet 72 but also in a gap S formed between the concave spherical surface portion 74e of the ball guide 74 and the convex spherical surface portion 72b of the ball sheet 72, and is substantially adjacent to each other. Filled.

  Then, when the ball bearing 60 shown in FIG. 9 moves horizontally with respect to the base floor surface 41, the ball body 70 located on the opposite side to the side where the horizontal movement proceeds is below the bottom surface 72d of the ball seat 72. The ball body 70 that has entered the gap S and circulated and rolled and located on the traveling side of the horizontal movement moves toward the side opposite to the traveling side.

  For this reason, when the ball bearings 60 are moved horizontally by bringing the ball bearings 60 into contact with the foundation floor 41, the ball bearings 60 are circulated and rolled following the horizontal movements. By operating the body 70 in this way, the seismic isolation frame 42 can freely move on the foundation floor 41 in any horizontal direction.

  As shown in FIG. 11, when the foundation floor 41 is lower than the other parts, the bolt 58 is lowered with respect to the plate-like member 54, and the ball guide 74 of the ball bearing 60 is also Therefore, a large number of ball bodies 70 can be uniformly brought into contact with the foundation floor surface 41 as in the case where the height of the foundation floor surface 41 is not lowered.

  In such a base-isolated floor structure 40 according to the present embodiment, the bolt 58 descends with respect to the plate-like member 54 and the ball guide of the ball bearing 60 as the height of the foundation floor 41 decreases. Since 74 also descends, the ball bodies 70 of all the ball bearings 60 can be brought into uniform contact with the foundation floor surface 41 even if the foundation floor surface 41 has a portion whose height is lower than the other portions. it can.

  In addition, the seismic isolation floor structure 40 according to this embodiment has all the ball bearings 60 even if the foundation floor surface 41 has a portion whose height differs from that of most other foundation floor surfaces 41 depending on the location. Since the ball body 70 can be uniformly brought into contact with the foundation floor surface 41, an effective seismic isolation operation can be sufficiently performed against horizontal vibration and displacement of the building caused by an earthquake or the like.

  The seismic isolation floor structure 40 includes a connecting member 52 that connects a pair of frames 46 that are arranged so that the ends thereof face each other, and the ends of the pair of frames 46 of the connecting member 52. The plate-like member 54 (see FIG. 1), the ball bearing 60, and the like are disposed below the raised plate portion 52h (see FIGS. 4 and 5) that is raised upward, so that the seismic isolation floor structure 40 is provided. An increase in the height dimension can be prevented.

  The seismic isolation floor structure 40 includes a frame 46, a cover 48, and a connecting frame 50 that constitute the seismic isolation frame 42 fixed to the connecting member 52. Since the connecting member 52, the plate-like member 54, the support bar member 56, and the ball bearing 60 are configured, the seismic isolation floor structure 40 has a simple structure and is easy to assemble. Manufacturing costs can be reduced.

  Therefore, as described above, according to the seismic isolation floor structure 40 according to the present embodiment, the structure is simple, the material cost and the manufacturing cost can be reduced, and the basic floor surface 41 can be reduced. Even if there are portions having different heights depending on the location, an effective seismic isolation operation can be sufficiently performed as in the case where there are no portions having different heights on the foundation floor surface 41.

  FIGS. 12 to 17 are views referred to for explaining the base isolation floor structure 80 according to the second embodiment of the present invention.

  As shown in FIG. 12, the seismic isolation support part 82 of the base isolation floor structure 80 according to the present embodiment mainly includes a connecting member 52, a first plate member 84 (plate member), a support bar member 86, a first member. One round bar member 88, a second plate member 90, a second round bar member 92, a bolt 58 (engagement bar member), and a ball bearing 60 are provided. The seismic isolation frame 42 is supported from below.

  That is, the seismic isolation support portion 82 of the base isolation floor structure 80 is the first in place of the plate-like member 54 and the support bar member 56 of the base isolation support 44 in the base isolation floor structure 40 of the first embodiment. A plate-like member 84, a support bar member 86, a first round bar member 88, a second plate-like member 90, and a second round bar member 92 are provided.

  Here, the other component members excluding the connecting member 52 from the seismic isolation support portion 82, that is, the support bar member 86, the first plate member 84, the first round bar member 88, the second plate member 90, the second member. The round bar member 92, the bolt 58, and the ball bearing 60 are collectively referred to as a seismic isolation leg.

  As shown in FIG. 12, the male threaded portion 86a of the support rod member 86 is inserted from the lower side in the drawing into the through hole 52j (see FIG. 4) of the raised plate portion 52h, and then the nut 62 is screwed into the male threaded portion 86a. The support rod member 86 is integrally fixed to the first plate-like member 84, as will be described later, so that the first plate-like shape is formed on the lower surface 52m of the rising plate portion 52h (see FIG. 5). The support bar member 86 is fixed to the raised plate portion 52h by bringing the upper surface 84a of the member 84 into contact with the screw 84 and fastening the screw.

  As shown in FIG. 15, the first plate-like member 84 is formed in a substantially square outer shape, and through holes 84 c are formed near each of the four corners. The through hole 84c is formed at a position coaxial with the through hole 52k (see FIG. 4) of the raised plate portion 52h when the first plate member 84 is superimposed on the raised plate portion 52h from below. The diameter of the through hole 52k is smaller than that of the through hole 52k.

  As shown in FIG. 14, the first plate-like member 84 is such that the lower end surface of the support rod member 86 is brought into contact with the center portion of the upper surface 84a, and the upper surface 84a and the outer peripheral surface of the lower end portion of the support rod member 86 are It is comprised integrally with the support bar member 86 by welding the corner part between.

  Thus, the support rod member 86 is provided so as to protrude upward from the upper surface 84a of the first plate-like member 84, and a male screw portion 86a is formed on the outer periphery thereof.

  In the 1st plate-shaped member 84 shown in FIG. 13, the 1st round bar member 88 which contacts the lower surface 84b is arrange | positioned, and the space between the lower surface 84b and the outer peripheral surface of the 1st round bar member 88 is welded. Thus, the first plate member 84 is configured integrally with the first round bar member 88.

  As shown in FIG. 14, below the first plate member 84 and the first round bar member 88, the second plate member 90 and the second round bar member 92 having the same configuration are overlapped with each other. Is arranged.

  The first round bar member 88 is placed on the upper surface 90a of the second plate member 90, and the outer peripheral surface of the first round bar member 88 is limited to the upper surface 90a of the second plate member 90. It is in contact so that it can roll within an angle.

  As shown in FIG. 15, the second plate-like member 90 also has the same outer shape as the first plate-like member 84, and the outer shape is aligned with the first plate-like member 84 and in the vertical direction. Are arranged so as to overlap each other at intervals.

  That is, the outer shape of the second plate-like member 90 is formed in a substantially square shape, and through holes 90c are formed near the four corners. The through hole 90 c is formed at a position on the same axis as the through hole 84 c of the first plate member 84 when the second plate member 90 is arranged so as to be aligned with the first plate member 84. The through hole 84c and the diameter are substantially the same.

  In the second plate-like member 90 shown in FIG. 14, a second round bar member 92 that contacts the lower surface 90 b is disposed, and the lower surface 90 b and the outer peripheral surface of the second round bar member 92 are welded. Thus, the second plate-like member 90 is configured integrally with the second round bar member 92.

  As shown in FIG. 15, the first round bar member 88 is arranged such that its axis extends in the left-right direction in the figure at the center of the first plate-like member 84 in the up-down direction and the first plate-like member 84. It is fixed to the lower surface 84b (see FIG. 14) of the member 84.

  On the other hand, the second round bar member 92 is arranged such that its axis extends in the vertical direction in the figure at the center in the left-right direction in FIG. 15 of the second plate-like member 90, and the second plate-like member. 90 is fixed to the lower surface 90b (see FIG. 14).

  For this reason, as shown in FIG. 15, the first round bar member 88 and the second round bar member 92 are arranged so that their axes are orthogonal to each other when viewed from above.

  12 and 13, the outer peripheral surface of the second round bar member 92 is in contact with the upper surface 74 a of the ball guide 74 of the ball bearing 60 so as to be able to roll within a limited angle.

  The male screw portion 58a of the bolt 58 is inserted into the through-hole 84c and the through-hole 90c of the second plate-like member 90 from the upper surface 84a side of the first plate-like member 84, and has a tip portion protruding downward. The upper surface 74 a of the ball guide 74 of the ball bearing 60 is fixed to the ball bearing 60 by being screwed to four female thread portions 74 c as shown in FIG. 10.

  The first plate-like member 84 is configured such that the lower surface of the head of the bolt 58 is engaged with or detached from the upper surface 84a of the first plate-like member 84 in accordance with the change in the distance from the foundation floor 41. The first plate member 84 is loosely connected to the ball bearing 60 with play.

  That is, as shown in FIG. 13, the space between the base floor 41 and the lower surface 84b of the first plate member 84 is shortened, and the lower surface of the head of the bolt 58 and the upper surface 84a of the first plate member 84 are separated. At this time, the ball bearing 60 is not engaged (separated) with the first plate member 84 via the bolt 58.

  On the other hand, when the space between the foundation floor 41 or the ball bearing 60 and the lower surface 84b of the first plate member 84 is widened, the bottom surface of the bolt 58 and the upper surface 84a of the first plate member 84 come into contact The bearing 60 is engaged with the first plate member 84 through the bolt 58.

  Therefore, the bolt 58 is normally spaced from the upper surface 84a of the first plate member 84 by the lower surface of the head when the tip of the male screw portion 58a is screwed to the female screw portion 74c of the ball guide 74. However, since the height of a part of the foundation floor surface 41 is lower than the other parts of the foundation floor surface 41, the ball guide 74 of the ball bearing 60 is formed. When the height of the bolt 58 is lowered from the other ball bearing 60, the lower surface of the head of the bolt 58 comes into contact with the upper surface 84a of the first plate member 84, and the ball guide 74 and the first plate member 84 are most separated. It becomes a state.

  By the way, as shown in FIG. 12, the head portion of the bolt 58 has a raised plate portion 52h (see FIG. 4) of the connecting member 52 in a state where the male screw portion 58a is inserted into the through hole 84c of the first plate member 84. 5) is inserted into the through hole 52k from below and assembled.

  Depending on the state of the foundation floor 41, the upper surface 74 a and the bolt 58 of the ball bearing 60 are moved relative to the first plate member 84 and the second plate member 90 through the rolling operation of one or both of the round bar members 88 and 92. In order to prevent the head of the bolt 58 from coming into contact with the inner peripheral surface of the through-hole 52k when the bolt 58 is rotated by a predetermined angle, the diameter of the through-hole 52k of the raised plate portion 52h is the diameter of the head of the bolt 58. It is formed larger than.

  The through hole 84c (see FIG. 13) of the first plate-like member 84 and the through-hole 90c of the second plate-like member 90 also include the upper surface 74a and the bolt 58 of the ball bearing 60, and one or both of the round bar members 88 and 92. The male screw portion 58a of the bolt 58 contacts the inner peripheral surface of the through-hole 84c or the through-hole 90c when rotating by a predetermined angle with respect to the first plate-like member 84 or the second plate-like member 90 through the rolling operation. In order to avoid this, the diameter of the bolt 58 is larger than the diameter of the male threaded portion 58a.

  As described above, the first plate member 84 and the ball bearing 60 are engaged with or disengaged from each other via the bolts 58. When the first plate member 84 and the ball bearing 60 are separated, the first plate member 84 and the ball bearing 60 are engaged with each other. Since the two plate-like members 90 are loosely connected to the ball bearing 60 with play, the first round bar member 88 and the second plate are compared with the first plate-like member 84 in a substantially stationary state. The ball bearing 60 is allowed to rotate to a predetermined angle through the shaped member 90 and the second round bar member 92.

  Further, when the foundation floor 41 is inclined with respect to the horizontal plane in the left-right direction in FIG. 17, the ball guide 74 of the ball bearing 60 is relative to the first plate member 84 via the first round bar member 88. It rotates by a predetermined angle.

  Further, when the foundation floor surface 41 is inclined with respect to the horizontal plane in the front-rear direction of the paper surface in the drawing, the ball guide 74 of the ball bearing 60 is moved with respect to the second plate member 90 via the second round bar member 92. Turn a predetermined angle. In this way, a large number of ball bodies 70 can be brought into uniform contact with the foundation floor surface 41 in the same manner as when the foundation floor surface 41 is not inclined.

  In addition, if the ball guide 74 of the ball bearing 60 is inclined with respect to the horizontal plane in a direction other than the left-right direction or the front-rear direction in FIG. The ball 70 is rotated by a predetermined angle with respect to both the first plate-like member 84 and the second plate-like member 90, and the large number of balls 70 are moved to the foundation floor 41 in the same manner as when the foundation floor 41 is not inclined. Uniform contact is possible.

  In the seismic isolation floor structure 80 according to the present embodiment, the bolt 58 moves up and down in accordance with the change in the height of the foundation floor 41 and the vertical distance between the first plate member 84 and the ball bearing 60. 17, not only the foundation floor surface 41 is inclined as shown in FIG. 17, but also the foundation floor surface 41 as shown in FIG. The ball bodies 70 of all the ball bearings 60 can be uniformly brought into contact with the foundation floor surface 41 as in the case where the foundation floor surface 41 does not have a portion having a different height.

  Further, in the base isolation floor structure 80 according to the present embodiment, the frame 46, the cover 48, and the connection frame 50 that constitute the base isolation frame 42 are fixed to the connection member 52, and the base isolation is performed. The support portion 82 is mainly composed of the connecting member 52, the first plate member 84, the support rod member 86, the first round bar member 88, the second plate member 90, the second round rod member 92, and the ball bearing 60. Therefore, since the base isolation floor structure 80 is simple and easy to assemble, the material cost and manufacturing cost can be reduced.

  Therefore, as described above, according to the seismic isolation floor structure 80 according to the present embodiment, the structure is simple, the material cost and the manufacturing cost can be reduced, and the foundation floor surface 41 can be reduced. Even if there are portions having different heights depending on the location, an effective seismic isolation operation can be sufficiently performed as in the case where there are no portions having different heights on the foundation floor surface 41.

  In addition, in the seismic isolation floor structure 40 according to the first embodiment, the case where the base floor surface 41 has a portion having a different height has been described. However, the base isolation floor structure according to the second embodiment has been described. As described above in part in 80, the present invention can also be applied to the case where the foundation floor 41 has an inclined surface.

  Further, in the base isolation floor structure 40 according to the first embodiment, the convex spherical portion 56c is formed at the tip of the protruding portion 56b of the support bar member 56, but instead of the convex spherical portion 56c. In addition, a chamfered portion may be formed by cutting off the corner portion of the tip portion at approximately 45 degrees.

  Further, the support bar member 56 in the base isolation floor structure 40 is configured by a substantially single component that is inserted through the through hole 54d of the plate-like member 54, but from the upper surface 54a of the plate-like member 54. The portion projecting upward and the portion projecting downward from the lower surface 54b may each be constituted by a plurality of separate members.

  In the seismic isolation floor structure 80 according to the second embodiment, two sets of the first plate member 84 and the first round bar member 88, and the second plate member 90 and the second round bar member 92 are provided. For example, the configuration of only one set of the first plate member 84 and the first round bar member 88 may be arranged.

2 Base-isolated floor structure 3 Foundation floor surface 4 Ball bearing 6 Floor plate 6a Top surface 8 Ball body 10 Ball seat 10a Convex spherical surface portion 10b Bottom surface 12 Ball guide 12a Concave spherical surface portion 12b Top surface 12c Female thread portion 14 Bolt 40 Base isolation floor structure 41 Base floor Surface 42 Seismic isolation frame 44 Seismic isolation support portion 46 Frame 46a Hollow portion 46b Through hole 47 Bolt 48 Cover 48a Through hole 50 Connection frame 50a Hollow portion 52 Connection member 52a Flat plate portion 52b Upper surface 52c Screw hole 52d Notch portion 52e Bending plate portion 52f Long hole 52g Inclined portion 52h Swelling plate portion 52i Upper surface 52j, 52k Through hole 52m Lower surface 54 Plate member 54a Upper surface 54b Lower surface 54c, 54d Through hole 56 Support rod member 56a Male screw portion 56b Protruding portion 56c Convex spherical surface portion 58 Bolt 58a Male thread 6 Ball bearing 62 Nut 70 Ball body 72 Ball seat 72a Cylindrical portion 72b Convex spherical surface portion 72c Top surface 72d Bottom surface 72e Female thread portion 74 Ball guide 74a Top surface 74b Bottom surface 74c Female thread portion 74d Counterbore hole 74e Concave spherical surface portion 74g Stepped concave portion 76 Countersunk screw 76a Male thread portion 80 Base-isolated floor structure 82 Base-isolated support portion 84 First plate member 84a Upper surface 84b Lower surface 84c Through hole 86 Support rod member 86a Male thread portion 88 First round rod member 90 Second plate member 90a Upper surface 90b Lower surface 90c Through hole 92 Second round bar member S Clearance W Welding

Claims (3)

In the seismic isolation floor structure having a base isolation frame having a plurality of frames and a plurality of base isolation support parts for supporting the base isolation frame,
The seismic isolation support part includes a ball bearing placed on a foundation floor, a plate-like member connected to the seismic isolation frame, one end fixed to the ball bearing, and the other end extending upward. An engagement rod member that is inserted into a through-hole formed in the plate-like member so as to be engageable,
The other end of the engaging Gobo member is immune to the foundation floor and in response to changes in the spacing of the plate-like member, characterized in that it disengaged from or the upper surface on the upper surface of the plate-like member Seismic structure. The seismic isolation support portion includes a connecting member that connects the frames arranged so that their ends face each other,
The plate-like member is connected to the lower surface of the connecting member with its upper surface contacting,
The engagement bar member is a bolt;
The male screw portion of the bolt is inserted into the through hole of the plate-like member, and the tip portion protruding downward of the plate-like member is screwed to the upper surface of the ball bearing,
2. The waiver according to claim 1 , wherein a diameter dimension of the through hole of the plate-like member is formed to be larger than a diameter dimension of a male screw portion of the bolt and smaller than a diameter dimension of a head portion of the bolt. Seismic structure. The seismic isolation support part includes a connecting member that connects the frames arranged so that their ends face each other, and a base isolation leg part placed on the foundation floor surface,
The connecting member has a rising plate portion formed so as to rise upward between the frames in which the respective end portions are opposed to each other,
The base isolation floor structure according to claim 1 or 2, wherein the base isolation leg portion is disposed below the rising plate portion.

Images