JP2018189223A - Rolling pivot device using a plurality of spherical bodies - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy a requirement that, in a rolling pivot device which is used by being combined with the other base isolation member, a laminated rubber pivot being, in particular, a main base isolation member is enhanced in a support capacity and a horizontal deformation capacity, and therefore, in the rolling pivot device which is interposed in parallel with the laminated rubber pivot, a support capacity and a stable horizontal moving capacity which are not inferior to those of the laminated rubber pivot are required.SOLUTION: A rolling pivot device is of a two-face rolling type, has four or more pieces of steel balls within an upper receiving range, and can support any load by setting an arrangement of the steel balls to be in an individual number which coincides with a load from an upper part. Then, stable rolling can be expected by a pipe filler which is interposed between the adjacent steel balls with an interval, and a float of the steel ball at a violent earthquake or the like can be prevented by a float prevention plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing device for a seismic isolation structure.

  A rolling seismic isolation (support) device using a plurality of balls, which is provided with a cage that can be freely rolled so that the relative positional relationship of all the steel balls on the lower receiving surface is constant (see Patent Document 1). In addition, there is a support (see Non-Patent Document 1) in which a structural block having a circulation function of steel balls and a linear motion device composed of bearing rails are combined in a cross shape and slid in an arbitrary direction.

JP2003-97638 Minister of Land, Infrastructure, Transport and Tourism authorization number (seismic isolation material) MVBR-0271, 0272, 0382 (Igata) and others

  The rolling seismic isolation device includes a lower receiving surface that receives all of the plurality of steel balls, an upper receiving surface that receives a plurality of the steel balls, and a cage that holds the relative positional relationship of the steel balls constant. It has been. The cage is divided into a square ring in a lattice shape, and one steel ball is put in each of the compartments, so that the relative positional relationship of all the steel balls on the receiving surface is kept constant. Is done. The height dimension of the cage is set smaller than the diameter of the steel ball so that the steel ball can be received by the upper and lower receiving surfaces without being disturbed by the cage. The cage is received by the lower receiving surface, and when the base is isolated, the retainer moves lightly. In this way, since the friction between the cage and the steel ball and the movement of the entire lower surface of the cage slides on the bearing surface, repeated reversal and strong horizontal movement during seismic isolation On the other hand, stable rolling of the steel ball becomes difficult (see Patent Document 1).

  The rolling bearing device is used in combination with other seismic isolation members. In particular, the laminated rubber bearing, which is a main seismic isolation member, has a large horizontal bearing capacity by increasing the supporting surface of the laminated rubber as a large load as much as possible. Therefore, a rolling bearing device interposed in parallel with the laminated rubber bearing is required to have a high support ability and horizontal movement ability that are not inferior to the laminated rubber bearing.

  The cage is pushed by the rolling steel ball and slid along the bearing surface, and has no horizontal control. Therefore, horizontal movement and horizontal rotation of the cage are left to the rolling of the steel balls. Random rolling of the steel balls may cause an error in the relative positional relationship between the cage and the bearing surface.

  There is a concern that the steel balls in the standby state that are not received by the upper receiving surface will jump by receiving the intense vertical movement in the initial stage of a major earthquake, the subsequent reversal, and the strong horizontal movement. .

  Linear motion rolling bearings support vertical loads with a small number, and the size of the sphere is limited by the mechanism of the device, so the support capacity is limited, and it can be said that it is difficult to apply to large structures ( Non-patent document 1).

  The rolling support device 8 includes a plurality of steel balls 4, a lower receiver 1 that receives all of the steel balls 4, an upper receiver 2 that receives a part of the steel balls 4, and a cage 3. The steel balls 4 are not rubbed against each other and do not jump up due to the gaps, allowing rolling in all directions.

  In the case of the rectangular cage 3, the cage 3 includes cage beams 3d assembled in a lattice shape, and cage columns 3e disposed at the respective intersections, and lifting prevention plates 3g. In the case of the hexagonal cage 3, the cage beams 3d are assembled in an equilateral triangle, and are constituted by cage columns 3e disposed at the respective intersections and a lifting prevention plate 3g.

  The main frame of the cage 3 is constructed by assembling a cage beam 3d and a cage column 3e, and is firmly tightened by a cage steel bolt 3f of a PC steel rod.

  The legs of the retainer column 3e are hemispherical, and slide on the lower receiving surface 1a when the lower receiving member 1 moves horizontally.

  The pipe filler 3 a is pivotally supported by the cage beam 3 d with a back gap, and is interposed with a gap between the steel ball 4. When the base 1 moves greatly and the pipe filler 3a and the rolling steel ball 4 come into contact with each other, the pipe filler 3a is rubbed and rotated by the steel ball 4, but the rotation of the pipe filler 3a and the steel The direction is opposite to the rolling of the sphere 4. The rubbing force between the pipe filler 3a and the cage beam 3d due to the rotation of the pipe filler 3a is very small, and the steel ball 4 can be stably rolled.

  The lifting prevention plate 3g is attached to the top of the retainer column 3e below the upper support 2 with a gap of several millimeters from the upper support 2. The steel ball 4 and the cage 3 may be lifted by vertical movement and horizontal movement at the time of a severe earthquake, but if the cage 3 within the range of the upper receiver 2 is lifted even slightly, it will be restrained by the upper receiver 2. Therefore, the lifting of the cage 3 and all the steel balls 4 is controlled.

  The steel ball receiving hole 3h vacated in the lifting prevention plate 3g has a hole width that is several millimeters smaller than the diameter of the steel ball 4, so that the steel ball 4 in a waiting state can be moved vertically and horizontally during a severe earthquake. It is possible to prevent lifting due to.

  The arrangement within the range of the upper receiving surface 2a of the steel ball 4 is four or more, and the load from the upper receiving 2 is shared and supported. By arranging the steel balls 4 within the range so as to correspond to the load from the upper support 2, a large load can be supported.

  The arrangement outside the range of the upper receiving surface 2a of the steel balls 4 is two (rows) or more, and by increasing the number of arrangements outside the range (number of rows), it becomes possible to increase the limit horizontal movement distance. .

  The ball diameters of the steel balls 4 are all the same, but it is possible to increase the limit horizontal movement distance by increasing the ball diameter.

  All the steel balls 4 roll by the horizontal movement of the support 1. The steel balls 4 within the range of the upper support 2 are subjected to pressure on both the lower support surface 1a and the upper support surface 2a, and a force in the direction opposite to the horizontal movement of the lower support 1 acts to retain the retainer. The beam 3d is pushed forward. Similarly, a force in the direction opposite to the horizontal movement of the lower support 1 is applied to the steel ball 4 in the standby state outside the range of the upper support 2 but is received by the cage beam 3d.

  The rectangular cage 3 is provided at an appropriate interval from the cage guide 5 with the torsion coil spring 5a. The rectangular cage 3 may rotate horizontally due to repeated reversals during earthquakes, strong and weak vibrations, and other factors, and the relative positional relationship with respect to the lower support 1 may be out of order. The cage guide 5 makes it possible to push back the cage 3 and return it to the original relative position with respect to the lower support 1 when the relative positional relationship with respect to the lower support 1 is changed in the retainer 3. In the case of the hexagonal cage 3, since the planar configuration of the cage 3 is a point object, the relative positional relationship does not go wrong even if horizontal rotation occurs, and the cage guide 5 is unnecessary.

  Since the moving distance of the cage 3 is a two-sided rolling with a steel ball 4 interposed between the lower support 1 and the upper support 2, the moving distance of the lower support 1 is the lower support 1 and the upper support 2. It becomes the part of the rolling of the two sides and becomes twice the rolling of the one side. That is, the movement distance of the retainer 3 relative to the support 1 is half.

  The load transmission of the steel ball 4 is transmitted to the lower support 1 by the steel ball 4 interposed between the lower support 1 and the upper support 2. Is efficiently transmitted only through the steel balls 4.

  Since the rolling friction coefficient of the rolling bearing device 8 is very small, it is affected by the weight of the upper structure in the adjustment of the limit horizontal movement and natural period, like the laminated rubber bearing that is the main member of the seismic isolation device. Free design is possible.

  The height of the rolling bearing device 8 is low only by the lower support 1, the upper support 2 and the steel ball 4, and is lower than other seismic isolation devices interposed in parallel on the building seismic isolation floor 9. It can be installed with plenty of room.

In the case of the pipe filler according to claim 1, even if a sudden reversal occurs during an earthquake motion by the pipe filler that is pivotally supported by the cage beam with a back shaft and is provided with a gap between the steel balls, Stable rolling is possible.
In the case of the lifting prevention plate according to the second aspect, it becomes possible to prevent the steel ball that rolls during a strong earthquake motion from lifting.

The rectangular holder of an embodiment is shown, a figure (a) is a top view, a figure (b) is a II arrow view of Drawing (a), and figure (c) is II-II of figure (a). A line arrow figure and figure (d) are top views of a floating prevention board. Drawing (a) Drawing (c) is a top view of the operating state of a cage guide, and figure (b) is an II line arrow view of Drawing (a). Drawing (a) Drawing (b) is a sectional view of the operating state of a maintenance machine. Drawing (a) Drawing (b) is a sectional view of the operating state of a steel ball and a pipe filler. (A) Drawing (c) is an embodiment figure of a cage restraint bolt of a rectangular cage, Drawing (b) is an II line arrow figure, (d) is an II-II arrow figure. The hexagonal retainer of an embodiment is shown, a figure (a) is a top view, a figure (b) is a II line view figure of figure (a), and figure (c) is II- of figure (a). FIG. 2D is a view taken along the line II-II, FIG. 4D is a view taken along the line III-III in FIG. 4A, and FIG. 4E is a view taken along the line IV-IV in FIG. Figures (a) and (b) show a partial plan view and a partial view of an embodiment of a rectangular cage, and Figs. (C) and (d) show a partial plan view and a partial view of an embodiment of a hexagonal cage.

  Embodiments of the present invention will be described with reference to the drawings as appropriate. In the following description, in order to simplify the shaking of the earthquake, it is assumed that the upper structure side is fixed and the lower structure side is horizontally moved.

  As shown in FIG. 1, the rolling support device 8 of the embodiment includes 1 as a lower support, 2 as an upper support, 3 as a cage, 3 g as a lifting prevention plate, 4 as a steel ball, and 5 as a cage guide.

  As shown in FIG. 1B, the rolling bearing device 8 is attached to the building seismic isolation floor 9 and is interposed in parallel with other damping devices such as a damping device and a laminated rubber bearing.

  As shown in FIG. 1A, the rectangular cage 3 uses 36 steel balls 4 in this embodiment, and is arranged on the lower receiving surface 1a at regular intervals of 6 rows and 6 rows. 1A, four steel balls are positioned under the rectangular upper receiving surface 2a, and the other 32 steel balls are in a waiting state.

  As shown in FIG. 6A, the hexagonal cage 3 uses 54 steel balls 4 in this embodiment, and is arranged in a point object on the lower receiving surface 1a. As shown, six steel balls are positioned under the circular upper receiving surface 2a, and the other 48 steel balls are in a standby state.

  In order to enable the relative positional relationship of all the steel balls 4 to be maintained, as shown in FIG. 1A, in the case of the rectangular retainer 3, the retainer beams 3d are assembled in a lattice shape and retainers at each intersection. It is comprised by the support | pillar 3e. As shown in FIG. 6 (a), in the case of the hexagonal cage 3, the cage beam 3d is assembled in an equilateral triangle and is constituted by cage posts 3e at each intersection.

  The pipe filler 3a pivotally supported by the cage beam 3d with a back gap is interposed between the steel balls 4, and the pipe filler 3a and the steel balls 4 are provided with a gap as shown in FIG. 4 (a). When there is a gap, the steel ball 4 can freely roll. As shown in FIG. 4 (b), when the support 1 moves greatly horizontally and the steel ball 4 rolls and the pipe filler 3 a and the steel ball 4 come into contact with each other, the pipe filler 3 a is rubbed against the steel ball 4. However, the rotation of the pipe filler 3 a is in the opposite direction to the rolling of the steel ball 4. The outer periphery of the cage beam 3d and the pipe filler 3a are coated with a fluororesin Teflon having a low friction coefficient.

  As shown in FIG. 1 (a) and FIG. 6 (a), the retainer column 3e is disposed at each intersection of the retainer beams 3d and supports the retainer beams 3d. As shown in FIGS. 1 (c) and 6 (b), the legs of the retainer column 3e are hemispherical and slide on the lower support surface 1a when the lower support 1 moves horizontally.

  The pipe filler 3a is pivotally supported with a back gap on the cage beam 3d. Therefore, the pipe fillers may interfere with each other in the vicinity of the retainer column 3e. In order to avoid this, as shown in FIGS. 7A, 7B, 7C, and 7D, pipe filler stoppers 3b with hooks are provided at both ends of the pipe filler 3a.

  As shown in FIGS. 1 (a) (b), 6 (a), and (b), the pipe filler protective plate 3c is a piece in which the pipe filler is damaged by mechanical equipment on the base isolation floor during an earthquake, It is equipped so as not to be damaged by other flying objects.

  In the case of the rectangular cage 3, the steel balls 4 within the range of the upper support 2 are arranged in two vertical rows and two horizontal lines within the range of the upper support 2 (range of a diagonal line) as shown in FIG. Four rows are arranged, and the load of the upper structure from the upper support 2 is shared and supported. In the case of the hexagonal cage 3, as shown in FIG. 6A, six pieces are arranged within the range of the upper support 2 (range of the circular oblique line), and the load from the upper support 2 is shared and supported. To do.

  In the case of the rectangular cage 3, the steel balls 4 outside the upper receiving range are arranged in two (rows) outside the upper receiving range 2 as shown in FIG. In the case of the hexagonal cage 3, as shown in FIG. 6A, four (rows) are arranged outside the range of the upper support 2. By arranging many steel balls 4 outside the range of the upper support 2, it becomes possible to increase the limit horizontal movement distance.

  Since the rolling support device 8 is a two-sided rolling, if the movement distance of the upper support is L as shown in FIG. 3 (a), the movement distance of the lower support is as shown in FIG. 3 (b). 2L.

  As shown in FIG. 4 (b), the steel ball 4 receives pressure on both the lower receiving surface 1a and the upper receiving surface 2a, and the steel ball 4 within the range of the upper receiving 2 It rolls by the horizontal movement and pushes the cage beam 3d. The steel ball 4 waiting to be received outside the range of the upper support 2 rolls due to the horizontal movement of the lower support 1, but is received by the cage beam 3d.

  As shown in FIGS. 1B, 1C and 1D, the floating prevention plate 3g has a countersunk plate mounting bolt mounted on the top of the retainer column 3e with a gap of several millimeters from the upper support 2. It is attached with 3i.

  As shown in FIGS. 7A, 7B, 7C, and 7D, the steel ball receiving hole 3h has a hole width slightly smaller than the outer diameter of the steel ball 4 to prevent the steel ball 4 from being lifted. ing. When the steel ball 4 hits the pipe filler 3a and further moves to a position where it hits the cage beam 3d across the tube plate of the pipe filler 3a, the edge of the steel ball receiving hole 3h is prevented from hitting. Therefore, the hole shape of the steel ball receiving hole 3h of the rectangular cage 3 is a quadrangle with a corner having an arc shape, and the hole shape of the steel ball receiving hole 3h of the hexagonal cage 3 is a triangle with a corner having an arc shape.

  When the support 1 moves in the direction of the retainer column, in the case of the rectangular retainer 3, as shown in FIGS. 7 (a) and 7 (b), the steel balls 4 intersect at 90 degrees with the retainer column 3e. The rolling is performed by pushing the two cage beams 3d. In the case of the hexagonal cage 3, as shown in FIGS. 7 (c) and 7 (d), the steel ball is rolled by pushing the two cage beams 3d intersecting at an angle of 60 degrees with the cage post 3e. Become.

  5 (a) and 5 (c) are views of a cage beam 3d in two vertical and horizontal directions of the rectangular cage 3, a cage restraining bolt 3f penetrating the cage beam 3d, and a cage post 3e. 5B and 5D are cross-sectional views of the cage beam 3d and the cage restraining bolt 3f. The cage restraining bolt 3f intersects in two stages (two directions).

  FIG. 6B is a diagram of the lateral cage beam 3d of the hexagonal cage 3, the cage restraining bolt 3f penetrating the cage beam 3d, and the cage post 3e. (C), (d), and (e) are sectional views of the cage beam 3d and the cage restraining bolt 3f. The cage restraining bolt 3f intersects in three stages (three directions).

  As shown in FIGS. 7 (a) and 7 (b), the cage beam mounting portion of the cage post 3e is a cube having a square shape as shown in FIGS. For the hexagonal cage, as shown in FIGS. 7C and 7D, the planar shape is a hexagonal cube. The lower column and the upper column of the attachment part of the cage beam are round steel, and the round steel is welded and joined to the cage beam attachment part.

  As shown in FIGS. 7A and 7C, the retainer beam attaching portion of the retainer column 3e is provided with a notch of about 3 mm in a portion for receiving the retainer beam 3d so as to fit the retainer beam 3d. . By doing in this way, joining of the retainer attachment part after tightening the retainer restraint bolt 3f of the PC steel rod and the retainer beam 3d can be made firm.

  As shown in FIGS. 2A, 2B, and 2C, the cage guide 5 is provided so that the relative positional relationship with the lower support is not greatly deviated by the movement and horizontal rotation of the rectangular cage 3 during an earthquake. Yes.

1 Underlay
1a Underside surface
2 Supermarket
2a Top surface
3 cage
3a Pipe filler
3b Pipe filler stopper
3c Pipe filler protective plate
3d cage beam
3e Cage post
3f Cage restraint bolt
3g Lifting prevention plate
3h Steel ball receiving hole
3i Lifting prevention plate mounting bolt
4 Steel balls
5 Cage guide
5a Torsion coil spring
6 Substructure
7 Superstructure
8 Rolling bearing device
9 Building seismic isolation floor

Claims (2)

The pipe filler interposed between adjacent steel balls is
A rolling bearing device that enables stable rolling of the steel ball during intense earthquake motion. The anti-lift plate is
The rolling bearing device according to claim 1, wherein the steel ball can be prevented from rising during a strong earthquake motion.

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