JP2015205751A - seismic isolation structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolation structure capable of exhibiting a seismic isolation effect against a quake, which actuates a structure, with a simple constitution.SOLUTION: A seismic isolation structure includes: a seismic isolation column 8 which is tiltably arranged between a first member 15a and a second member 15b and is provided with an insertion hole on an edge part; a plurality of tilt fulcrum forming members 13 which are arranged so as to surround the seismic isolation column 8 and form fulcrums when the seismic isolation column 8 starts to be tilted; and an insertion member 11 which is attached so as to be protruded from at least one of the first member 15a and the second member 15b and is inserted to the seismic isolation column 8. The seismic isolation column 8 is tilted by setting the tilt fulcrum forming members 13 as the fulcrums and, at the same time, an outer surface 11c of the insertion member 11 is brought into contact with the insertion hole to restrict a tilted angle.

Description

  The present invention relates to a seismic isolation structure that is applied to a structure such as a three-dimensional warehouse, a boiler steel frame, a three-dimensional parking, and a cargo handling facility to reduce the shaking of the structure, and a seismic isolation device including the seismic isolation structure.

  The three-dimensional warehouse has a configuration in which a plurality of racks (shelves) are three-dimensionally assembled by providing a plurality of steel pillars and a plurality of steel beams. When a large-scale earthquake occurs, this three-dimensional warehouse may be damaged, and the load stored in this three-dimensional warehouse may fall and be damaged. In this way, it is considered that a three-dimensional warehouse is provided with a seismic isolation structure to increase safety against earthquakes.

  As a seismic isolation structure of a three-dimensional warehouse, there is one having a seismic isolation structure made of laminated rubber between the lower ends of a plurality of pillars constituting the three-dimensional warehouse and the foundation (Patent Document 1). In addition, as a structure in which the pillars of the three-dimensional warehouse are cut at the upper and lower middle positions, the lower ends of the upper two pillars are connected by a horizontal first horizontal member, and the lower two parts corresponding to the upper two pillars By connecting the upper end of the column with a horizontal second horizontal member engageable with the first horizontal member, the first horizontal member and the second horizontal member are slid in the longitudinal direction via a low friction member. There is one in which the first horizontal member and the second horizontal member are connected by a viscoelastic body (Patent Document 2).

JP 2006-104883 A JP 2013-039989 A

  However, as in Patent Document 1, when a base-isolated structure with laminated rubber is provided at the lower end of each column of a three-dimensional warehouse provided with a large number of columns, it is necessary to add a foundation or the laminated rubber is relatively expensive. Therefore, there is a problem that the equipment cost of the three-dimensional warehouse increases.

  Also in Patent Document 2, since it is necessary to provide the first horizontal member and the second horizontal member, and further to provide a viscoelastic body for connecting the first horizontal member and the second horizontal member, the structure is There was a problem that the equipment cost of the three-dimensional warehouse increased due to the complexity.

  Furthermore, in Patent Document 2, the direction of base isolation is limited to the longitudinal direction in which the first horizontal member and the second horizontal member slide, and cannot be isolated from the direction perpendicular to the direction of the slide. There was a problem.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a seismic isolation structure that isolates vibrations acting on a structure with a simple configuration.

  The seismic isolation structure of the present invention is disposed so as to be inclined between the first member and the second member, and a plurality of seismic isolation columns in which insertion holes are formed at the end portions are attached so as to surround the seismic isolation columns, The tilt fulcrum forming member that forms a fulcrum when the seismic isolation column starts to tilt, and the first base member and the second member are attached so as to protrude from at least one, and inserted into the insertion hole of the base isolation column. The seismic isolation column is inclined with the inclined fulcrum forming member as a fulcrum, and the outer periphery of the insertion member abuts on the insertion hole to limit the inclination angle. .

  It is preferable that the seismic isolation column is limited by the insertion member to an inclination angle at which the inclination angle can return from the inclination by its own weight.

  The insertion member is preferably tapered.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration which acts on a structure with a simple structure can be seismically isolated.

(A) is a side view of a three-dimensional warehouse, (b) is a front view of a three-dimensional warehouse, and is an Ib-Ib arrow view of Fig.1 (a). (A) is a side view of the seismic isolation structure at normal times, (b) is a plan view of the seismic isolation structure at normal times, and is a view taken along the arrow IIb-IIb in FIG. 2 (a). It is the side view which showed a mode that the seismic isolation structure isolated. It is the side view which showed a mode that the seismic isolation column at the time of changing the length of an insertion member inclined. (A) is the figure which showed a mode that the insertion member of the seismic isolation structure was tapered. (B) is the figure which showed a mode that a seismic isolation column inclines when an insertion member is tapered. It is a side view which shows a mode that the insertion member was attached to the upper and lower horizontal flanges. (A) is a front view which shows the side of the three-dimensional warehouse in normal times, (b) is a front view which showed a mode that the seismic isolation column inclines and the pillar which comprises a three-dimensional warehouse is isolated.

  Hereinafter, an example of a mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described with reference to FIGS. In this embodiment, the case where the seismic isolation structure 5 is applied to a three-dimensional warehouse 100 (structure) will be described. FIG. 1A shows a side view of the three-dimensional warehouse 100. Moreover, FIG.1 (b) shows the front view of the three-dimensional warehouse 100, and is Ib-Ib arrow line view of Fig.1 (a).

  The three-dimensional warehouse 100 has a configuration in which a plurality of racks 3 (shelves) are three-dimensionally assembled by including a plurality of steel pillars 1 and a plurality of steel beams 2. This three-dimensional warehouse 100 is erected with a required height at a position sandwiching the stacker crane 4, and has a depth extending along the traveling direction of the stacker crane 4.

  The three-dimensional warehouse 100 has a narrow width corresponding to the load in which the width in the direction orthogonal to the traveling direction of the stacker crane 4 is stored. Further, the plurality of pillars 1 constituting the three-dimensional warehouse 100 have high strength for supporting the weight of the load of the rack 3.

  FIG. 2 (a) is a side view showing the seismic isolation structure 5 at normal times, and FIG. 2 (b) is a plan view of the seismic isolation structure 5 at normal times as seen from the arrow IIc-IIc in FIG. 2 (a). is there.

  The seismic isolation structure 5 includes a seismic isolation column 8, a plurality of inclined fulcrum forming members 13, an insertion member 11, and a sheet-like elastic member 12.

  The seismic isolation column 8 includes a bottomless rectangular tube-shaped cylindrical main body 8a and rectangular flanges 8b (projecting portions) formed at both ends of the cylindrical main body 8a. The seismic isolation column 8 is, for example, a rectangular steel square steel member having rectangular flanges 8b formed at both ends. Since the seismic isolation column 8 is a square tubular square steel material, it has insertion holes at both ends. And this seismic isolation column 8 is arrange | positioned between the 1st member and the 2nd member so that inclination is possible. In this embodiment, the first member is described as the horizontal flange 15a of the column 1 and the second member is described as the horizontal flange 15b of the column 1. That is, the seismic isolation column 8 is disposed so as to be tiltable between the horizontal flange 15a and the horizontal flange 15b of the column 1 which is a part of the structure to be isolated.

  In this embodiment, the seismic isolation column 8 has been described as a square steel material having a rectangular flange 8b, but the present invention is not limited to this. The seismic isolation column 8 only needs to have a column shape and an insertion hole formed in one of its ends, and may be, for example, a round steel material. Further, the seismic isolation column 8 has been described with the configuration in which the flange 8b is formed at both ends, but the flange 8b is not an essential configuration, and the shape thereof may be, for example, a circle. Further, the flange 8b includes a rectangular shape having a long side and a short side, an ellipse having a long axis and a short axis, and also includes a shape in which a part is cut out.

  In the present embodiment, the horizontal flange 15a of the pillar 1 which is a part of the structure to be seismically isolated is described as the first member, and the horizontal flange 15b is described as the second member. However, the present invention is not limited to this. For example, the first member and the second member may be further provided with two plate-like members 16a and 16b that serve as attachment portions for the structure to be seismically isolated without using a part of the structure. In this case, the first member is the plate member 16a, and the second member is the plate member 16b. The plate-like members 16a and 16b, the seismic isolation column 8, the plurality of inclined fulcrum forming members 13, 13, 13, and 13, the pair of insertion members 11 and 11, and the sheet-like elastic member 12 The seismic isolation device 25 is configured. The seismic isolation device 25 is a device that is unitized independently of the structure to be seismically isolated.

  In this case, the first member is the plate member 16a, and the second member is the plate member 16b. The plate-like members 16a and 16b, the seismic isolation column 8, the plurality of inclined fulcrum forming members 13, 13, 13, and 13, the insertion member 11, and the sheet-like elastic members 12 and 12 are seismically isolated. The apparatus 25 is configured. The seismic isolation device 25 is a device that is unitized independently of the structure to be seismically isolated.

  The tilt fulcrum forming member 13 is, for example, an acute angle iron, and forms a fulcrum when the seismic isolation column 8 starts to tilt. As shown in FIGS. 2 (a) and 2 (b), a total of four (plural) of inclined fulcrum forming members 13 are attached to the horizontal flanges 15a and 15b so as to correspond to the four sides of the rectangular flange 8b. The four sides of the flange 8b of the seismic isolation column 8 are enclosed. At this time, each inclined fulcrum forming member 13 is attached to the corresponding side of the rectangular flange 8b with a gap. Thus, the inclined fulcrum forming members 13, 13, 13, 13 function as stoppers so that the seismic isolation column 8 does not slide in the horizontal direction.

  The inclined fulcrum forming member 13 that is an acute angle steel is arranged so as to have an inclined surface that is separated from the horizontal flange 15a (15b) as it is separated from the seismic isolation column 8. This inclined surface corrects the positional deviation of the seismic isolation column 8. That is, even when the seismic isolation column 8 is displaced when the seismic isolation column 8 returns from the inclination, the flange 8b of the seismic isolation column 8 is guided to a predetermined position by sliding the inclined surface, and the positional misalignment is corrected. It has come to be.

  In the present embodiment, the inclined fulcrum forming member 13 has been described with an acute angle iron, but is not limited thereto. Any member may be used as the inclined fulcrum forming member 13 as long as it becomes a fulcrum when the seismic isolation column 8 is inclined. For example, normal angle irons may be used instead of acute angle irons.

  The insertion member 11 has a cylindrical shape, for example. The insertion member 11 is attached to the horizontal flange 15a so as to protrude from the horizontal flange 15a. The insertion member 11 is inserted into the insertion hole of the seismic isolation column 8 when configuring the seismic isolation structure 5. In the present embodiment, the shape of the insertion member 11 has been described as a cylindrical shape, but is not limited thereto. The shape of the insertion member 11 may be a cylinder, a prism, or a square tube. For example, the insertion member 11 may be a square steel pipe that is generally distributed as a building material.

  The sheet-like elastic member 12 is, for example, a rubber sheet, and is a member interposed between the seismic isolation column 8 and the horizontal flange 15a (15b). The sheet-like elastic member 12 is an incompressible material with a small volume change compared to a metal. When the rubber sheet is interposed between the seismic isolation column 8 and the horizontal flange 15a (15b) and receives a compressive load, the rubber sheet tends to bulge outward due to non-compression, but is restricted by the top and bottom surfaces. Therefore, the compression load is supported with high rigidity.

  In this embodiment, the sheet-like elastic member 12 has been described as a rubber sheet, but is not limited to a rubber sheet. For example, a foam material can be substituted. The sheet-like elastic member 12 is not an essential component of the seismic isolation structure 5 and may be removed from the configuration of the seismic isolation structure 5.

  The manner in which the seismic isolation structure 5 acts when an earthquake shake occurs will be described with reference to FIG. FIG. 3 is a side view showing how the seismic isolation structure 5 is isolated. Here, the arrows in the figure indicate the direction of earthquake shaking.

  As shown in FIG. 3, it is assumed that an earthquake shakes to the left as indicated by the arrow in the figure. Then, the lower horizontal flange 15a moves to the left, and the upper horizontal flange 15b tries to stay in place due to inertia. Then, the seismic isolation column 8 allows relative movement of the lower horizontal flange 15a with respect to the upper horizontal flange 15b by the flange 8b being inclined with the inclined fulcrum forming member 13 as a fulcrum. Here, when the seismic isolation column 8 is tilted to a predetermined angle, the outer peripheral surface 11c of the insertion member 11 is restricted so as to contact the inner peripheral surface 8c of the seismic isolation column 8 and not to tilt any further.

  The relationship between the length of the insertion member 11 and the maximum inclination angle of the seismic isolation column 8 will be described with reference to FIG. FIG. 4 is a side view showing a state in which the seismic isolation column 8 is inclined when the length of the insertion member 11 is changed. As shown in FIG. 4, when the length of the insertion member 11 is made shorter than that shown previously, the maximum inclination angle at which the seismic isolation column 8 can be inclined can be increased. The length of the insertion member 11 is adjusted to an inclination angle that allows the seismic isolation column 8 to return from the tilt by its own weight when the seismic isolation column 8 tilts. Thereby, the seismic isolation structure 5 always restores the base isolation column 8 to its original posture by its own weight.

  A state in which the maximum inclination angle of the seismic isolation column 8 is changed without changing the length of the insertion member 11 will be described with reference to FIG. FIG. 5A is a diagram showing a state where the insertion member 11 of the seismic isolation structure 5 is tapered. FIG. 5B is a diagram illustrating a state where the seismic isolation column 8 is inclined when the insertion member 11 is tapered.

  As shown in FIG. 5A, the insertion member 21 has a truncated cone shape in which the side to be inserted into the seismic isolation column 8 tapers, that is, becomes narrower as the distance from the horizontal flange 15a increases. As shown in FIG. 5B, the tapered insertion member 21 has an inner peripheral surface 8c that is tapered when the seismic isolation column 8 is not inclined as compared with the case where the cylindrical insertion member 11 is employed. 21 does not come into contact with the outer peripheral surface 21c of 21. That is, the tapered insertion member 21 can increase the angle at which the seismic isolation column 8 is tilted as the tip end side is made thinner. And the taper insertion member 21 can adjust the inclination angle of the seismic isolation column 8 to the inclination angle which can return from inclination with dead weight by adjusting thinness.

  Here, the shape with the tip side tapered is described with a truncated cone, but the present invention is not limited to this. The insertion member 21 whose tip side is tapered may have a conical shape, a pyramid shape, or a truncated pyramid shape. Further, the tapered insertion member 21 may be either hollow or solid.

  In the above description, the insertion member 11 and the tapered insertion member 21 are attached only to either the lower horizontal flange 15a or the upper horizontal flange 15b, in this embodiment, only the lower horizontal flange 15a. Although described, it is not limited to this. As shown in FIG. 6, it may be attached to the upper horizontal flange 15b. FIG. 6 shows a state in which the insertion member 11 is attached to the upper and lower horizontal flanges 15a and 15b.

  The manner in which the seismic isolation column 8 tilts and seismically isolates the three-dimensional warehouse 100 will be described with reference to FIG. FIG. 7A is a side view showing a side surface of the three-dimensional warehouse 100 in a normal state. FIG. 7B is a front view showing a state where the seismic isolation column 8 is tilted and the three-dimensional warehouse 100 is isolated. In FIG. 7, the tilt fulcrum forming member 13 is omitted for the sake of easy understanding of the state in which the seismic isolation column is tilted and is isolated.

  As shown in FIG. 7, the three-dimensional warehouse 100 includes a plurality of seismic isolation columns 8 at the same height position. The seismic isolation structure 5 is installed at a height of about 1/3 to 1/2 from the upper side of the three-dimensional warehouse 100 in order not to cause the upper side of the three-dimensional warehouse 100 to lock. Yes. Thus, even if the seismic isolation structure 5 is installed in the upper part of the three-dimensional warehouse 100, the seismic isolation structure 5 reduces the upper side of the seismic isolation structure 5, and as a result, the seismic isolation structure 5 does not. The inventor's research has revealed that the lower side swing is also reduced. The seismic isolation structure 5 is arranged such that the shape of the flange 8b of the seismic isolation column 8 is square and the sides constituting the flange 8b are along the width direction and depth direction of the three-dimensional warehouse 100.

  Suppose that, from the state of FIG. 7A, for example, as shown by the arrow in FIG. In the three-dimensional warehouse 100, the lower rack 3b moves leftward across the seismic isolation column 8. At this time, the upper rack 3a tries to stay in place due to inertia.

  Then, the plurality of seismic isolation columns 8 are inclined in the same manner so that the upper side is on the right and the lower side is on the left. That is, the three-dimensional warehouse 100 allows the horizontal displacement of the lower rack 3b while keeping the upper rack 3a in place by the seismic isolation column 8 being inclined.

  As described above, even if an earthquake occurs and the shaking acts on the three-dimensional warehouse 100 as an external force, the three-dimensional warehouse 100 is isolated by tilting the seismic isolation column 8, and a large stress does not act on the three-dimensional warehouse 100. Yes.

  In addition, although the case where a shake due to an earthquake occurred in the left direction has been described, in the figure, when a shake due to an earthquake occurs in the right direction, the seismic isolation columns 8 are arranged such that the upper side is on the left and the lower side is on the right. Each of them tilts in the same way, and the three-dimensional warehouse 100 is isolated.

  In addition, in the figure, when a vibration occurs in the direction from the back to the front, the plurality of seismic isolation columns 8 are inclined in the same manner so that the upper side is the back and the lower side is the front, and the three-dimensional warehouse 100 is isolated. To do. Similarly, when shaking occurs in the direction from the front to the back in the figure, the plurality of seismic isolation columns 8 are inclined in the same manner so that the upper side is the front and the lower side is the back, thereby excluding the three-dimensional warehouse 100. Tremble.

  The three-dimensional warehouse 100 described above has been described with a configuration in which the shape of the flange 8b of the seismic isolation column 8 is a square, and the sides constituting the flange 8b are arranged along the width direction and the depth direction of the three-dimensional warehouse 100. It is not limited to. For example, the flange 8b of the seismic isolation column 8 constituting the seismic isolation structure 5 is a rectangle having a long side and a short side, the long side is along the depth direction of the three-dimensional warehouse 100, and the short side is the width direction of the three-dimensional warehouse 100. You may arrange | position so that it may follow. When arranged in this way, the seismic isolation function is more likely to act in the width direction than in the depth direction of the three-dimensional warehouse 100, and it is possible to effectively prevent the load from dropping due to the shaking in the width direction. In addition, the seismic isolation structure 5 should be a uniaxial seismic isolation that isolates only the width direction of the three-dimensional warehouse 100, taking into account the expected vibration of the long side of the flange 8b of the seismic isolation column 8. You can also.

  According to the seismic isolation structure 5 of the present invention, the seismic isolation column 8 tilts with the tilt fulcrum forming member 13 as a fulcrum, and the inner peripheral surface 8c of the seismic isolation column 8 is inserted into the insertion member 11 when the seismic isolation column 8 tilts more than a predetermined amount. The inclination angle of the seismic isolation column 8 is limited by abutting on the outer peripheral surface 11c. As a result, the stress accompanying the relative movement of the horizontal flange 15a (first member) and the horizontal flange 15b (second member) can be absorbed, and the vibration of the earthquake can be isolated in the horizontal biaxial direction with a simple configuration and the base is isolated. The target can be prevented from being damaged.

  Moreover, according to the seismic isolation structure 5 of the present invention, the insertion member 11 limits the inclination angle of the seismic isolation column 8 to an inclination angle at which the seismic isolation column 8 can return from the inclination by its own weight. Thereby, the seismic isolation column 8 can always be restored to the original posture by its own weight. And when the rectangular steel pipe currently generally distribute | circulated as a building material is used for the insertion member 11, acquisition of a material is easy and it can aim at low cost. Further, when the insertion member 11 is a square steel pipe and the seismic isolation column 8 is also a square steel pipe and the outer side surface of the insertion member 11 and the inner side surface of the seismic isolation column are parallel, the outer side surface of the insertion member 11 and the outer side surface are exempted. The inner surface of the seismic column 8 can be brought into line contact, and the contact area can be increased. Further, when the insertion member 11 is a circular steel pipe, there is no need to arrange the outer side surface of the insertion member 11 and the inner side surface of the seismic isolation column in parallel, and there is an advantage that construction is easy.

  Further, according to the seismic isolation structure 5 of the present invention, the insertion member 21 is tapered. Thereby, the tapered insertion member 21 can limit the inclination angle of the seismic isolation column 8 to a tilt angle at which the seismic isolation column 8 can return from the inclination by its own weight without shortening the length. Here, the inclination angle of the seismic isolation column 8 can also be changed by changing the length of the insertion member 11. However, if the length of the insertion member 11 is shortened, the seismic isolation column 8 may be detached from the insertion member 11. The tapered insertion member 21 can be adjusted to an inclination angle at which the seismic isolation column 8 can return from the inclination by its own weight without considering that the seismic isolation column 8 is removed by shortening its length.

  Further, according to the seismic isolation structure 5 of the present invention, the sheet-like elastic member 12 is interposed between the flange 8b of the seismic isolation column 8 and the horizontal flange 15a (15b). As a result, the interposed sheet-like elastic member 12 acts as a cushioning material and can suppress the occurrence of high-frequency vibration associated with the contact between the seismic isolation column 8 and the horizontal flange 15a (15b). When the sheet-like elastic member 12 is a rubber sheet, the restoring force of the seismic isolation column 8 can be adjusted by using the spring rigidity of the rubber sheet.

  Moreover, according to the seismic isolation structure 5 of this invention, the seismic isolation structure 5 is comprised using the horizontal flanges 15a and 15b of the pillar which are a part of structures which isolate | separate a 1st member and a 2nd member. Accordingly, the insertion member 11 is attached to each of the horizontal flanges 15a and 15b of the column 1 which is a part of the structure, and the insertion member 11 is inserted into the seismic isolation column 8, and four inclined fulcrum forming members 13 are provided. Existing structures can have seismic isolation functions simply by attaching them.

  In addition, the seismic isolation structure 5 of the present invention includes two upper and lower plate-like members 16a and 16b that serve as attachment portions of the structure to be seismic isolated without using the first member and the second member as part of the structure. Furthermore, it is good also as the seismic isolation apparatus 25 prepared and unitized. As a result, the seismic isolation device 25 assembled at the factory is placed in the middle of the structure, for example, between the flanges of the pillars, and the plate-like members 16a and 16b are simply fixed to the flanges. It can have a seismic function and can be removed in a batch. Therefore, this unitized seismic isolation device 25 can reduce the work load of attachment and removal.

  Further, the seismic isolation structure 5 of the present invention and the seismic isolation device 25 including the seismic isolation structure may be arranged in a plurality of stages in the vertical direction of the structure to be seismically isolated. If arranged in this way, a greater shaking can be absorbed than in the case of a single-stage seismic isolation.

  The seismic isolation structure of the present invention and the seismic isolation device equipped with the seismic isolation structure are applicable to various structures such as boiler steel frames, three-dimensional parking, cargo handling facilities, etc. in addition to the three-dimensional warehouse 100 shown in the above embodiment. it can. In addition, the seismic isolation structure of the present invention and the seismic isolation device provided with the seismic isolation structure can be variously modified without departing from the scope of the present invention.

5 Seismic isolation structure 8 Seismic isolation column 8c Inner circumference (inner circumference)
11 Insertion member 11c Outer peripheral surface (outer periphery)
12 Sheet-like elastic member 13 Inclined fulcrum forming member 15a Horizontal flange (first member)
15b Horizontal flange (second member)
16a Plate member (first member)
16b Plate member (second member)
21 Insertion member 25 Seismic isolation device

Claims (3)

A seismic isolation column that is arranged to be tiltable between the first member and the second member, and an insertion hole is formed at the end;
A plurality of members are attached so as to surround the seismic isolation column, and an inclined fulcrum forming member that forms a fulcrum when the seismic isolation column starts to tilt,
It is attached so as to protrude from at least one of the first member and the second member, and includes an insertion member inserted into the insertion hole of the seismic isolation column,
The seismic isolation column is tilted with the inclined fulcrum forming member as a fulcrum, and the outer periphery of the insertion member abuts on the insertion hole to limit an inclination angle.   The seismic isolation structure according to claim 1, wherein the seismic isolation column is limited by the insertion member to an inclination angle at which the inclination angle can return from the inclination by its own weight.   The seismic isolation structure according to claim 1 or 2, wherein the insertion member has a tapered shape.

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