JP4673154B2 - Movable floor for seismic isolation structure - Google Patents

Description

  The present invention relates to a movable floor for a seismic isolation structure.

  When installing a base-isolated structure such as a base-isolated building, in order to avoid interference between the base-isolated structure and the non-base-isolated structure during an earthquake, the space between the base-isolated structure and the non-base-isolated structure Are provided with regularly spaced grooves. This groove is shielded by a dog-running slab or expansion joint provided around the building. The dog-running slab and expansion joint move together with the seismic isolation structure when the seismic isolation function is activated during an earthquake. For this reason, in order to keep the grooves provided around the seismic isolation structure in a shielded state even during an earthquake, the dog-running slab and expansion joint protrude from the outer wall by a length approximately twice the width of the groove. There is a need. In addition, the tip of the dog-running slab or expansion joint requires a space larger than the width of the groove between other structures or the site boundary line in anticipation of movement during an earthquake. For this reason, a wide vacant area is required around the seismic isolation structure, and when such an vacant area cannot be secured, it is difficult to install the seismic isolation structure.

In order to solve such problems, movable floors for seismic isolation structures have been proposed (see Patent Documents 1 and 2).
JP 2000-120187 A JP 2002-81142 A

  With these movable bases for seismic isolation structures, if the groove width becomes narrow due to the relative motion of the base isolation structure with the ground during the earthquake, the movable floor for the base isolation structure bends downward and is seismically isolated. It is designed to prevent interference with structures. Conversely, when the seismic isolation structure moves relative to the ground in the direction in which the width of the groove widens, the movable floor for the seismic isolation structure returns to the position covering the groove, It is possible to prevent a state in which no cover exists. For this reason, even if the dog-running slab and the expansion joint around the seismic isolation structure are not so long, the state where the grooves around the seismic isolation structure are covered is maintained during an earthquake. For this reason, it has the advantage that it can be installed even if there is no wide open space around the seismic isolation structure.

On the other hand, a movable floor for a seismic isolation structure provided with an elastic spring member has also been proposed (Patent Document 3).
JP 2000-297481 A

  As shown in FIGS. 8 and 9, the movable floor for the seismic isolation structure has a stepped surface a () of the concrete foundation 95 with a predetermined pitch interval between the elastic members 94 formed in a cylindrical shape having a substantially H-shaped cross section. The upper surface of the spring member 94 is covered with top plates 96a and 96b. One end of the top plate 96 a is fixed to the tip of the dog run 97.

  In the movable floor for seismic isolation structure, even if the dog run 97 coupled to the seismic isolation building is moved by the earthquake motion, the elastic member 94 can be expanded and contracted to absorb the movement. For this reason, it is possible to prevent a step from occurring between the dog run 97 and its surroundings.

  However, the movable floor for seismic isolation structures described in Patent Documents 1 and 2 has a complicated structure because the link mechanism is controlled by a spring or a weight. Moreover, since the movable floor for seismic isolation structures is only supported by springs and weights, when a person passes over the movable floor, there is a risk of bending downward and falling into a groove.

  Moreover, since the movable floor for seismic isolation structures described in Patent Document 3 supports the elastic member with a stepped surface such as a concrete foundation, it prevents interference between the seismic isolation structure and the concrete foundation during an earthquake. It is necessary to make the dog running length as long as twice the width of the groove. For this reason, when there is no wide open space around the seismic isolation structure, installation becomes difficult. In this respect, by fixing the elastic member at the end without being supported by the stepped surface, it is possible to make it project in a state of floating in the groove and prevent interference between the seismic isolation structure and the concrete foundation . However, with this, the mechanical strength of the seismic isolation structure movable floor is weak, and when a person passes over it, there is a risk of bending downward, and there is a risk of falling or falling.

  The present invention has been made in view of the above-mentioned conventional circumstances, and can be installed even when the site area around the seismic isolation structure is small, the installation cost is low, and people etc. can pass safely. Providing a movable floor for seismic isolation structures that can be done is an issue to be solved.

  The movable floor for a seismic isolation structure according to the present invention is a movable floor for a seismic isolation structure for covering a groove provided around the seismic isolation structure, the top plate for covering the groove, An elastic member fixed to the groove wall facing the seismic structure and supporting the top plate and slidable in the width direction of the groove, the elastic member being elastically deformable in the width direction of the groove It consists of a cylinder part and the elastic piece extended from the side surface of this cylinder part, and supporting this top plate.

  The movable floor for a seismic isolation structure of the present invention is fixed to a groove wall surface facing the seismic isolation structure with a bolt or the like. And the dog run and expansion joint which protrudes from a base isolation structure are arrange | positioned so that the movable floor for base isolation structures may be covered. When the seismic isolation structure presses the elastic member due to the earthquake motion, the cylinder part is elastically deformed in the width direction of the groove, the elastic piece extending from the side surface of the cylinder part is also elastically deformed, and the top plate is in the width direction of the groove. Slide. Further, when the seismic isolation structure moves away from the elastic member in the width direction of the groove, the elastically deformed cylindrical portion and the elastic piece return to the original shape, and the top plate also slides to the original position. For this reason, even if the dog running slab and the expansion joint around the base isolation structure are not so long, the groove around the base isolation structure is always covered with the top plate at the time of the earthquake. For this reason, it has the advantage that it can be installed even if there is no wide open space around the seismic isolation structure.

  In addition, since the elastic piece that supports the top plate is provided on the side surface of the cylinder portion, the pressure received from the top plate is not only the cylinder portion but also the elastic piece, and the mechanical strength against the pressure from the top plate Becomes higher. For this reason, even if a person etc. pass on the top board, it becomes possible to support with the movable floor for seismic isolation structure itself. Therefore, it is no longer necessary to support the movable floor for seismic isolation structures with a stepped surface of a concrete foundation, and it can be a simple space, so the installation cost of the movable floor for seismic isolation structures is greatly reduced. be able to.

  In addition, the movable floor for a seismic isolation structure according to the present invention can be installed simply by fixing it to the upper end of the surface facing the seismic isolation structure in a groove provided around the seismic isolation structure. The construction cost is also low, and it is easy to install the existing seismic isolation structure later.

  Therefore, according to the movable floor for a seismic isolation structure of the present invention, it can be installed even when the site area around the seismic isolation structure is small, the installation cost is low, and people etc. pass safely. be able to.

  As the shape of the cylindrical portion, the cross section can be a cylindrical shape such as a polygonal shape, a round shape, or an elliptical shape. A polygonal cylindrical shape is preferable because the metal plate can be easily manufactured by press molding and fixing with bolts.

  It is also preferable that one end of the top plate in the width direction bends downward and has an L-shaped cross section. If it is like this, the mechanical strength with respect to a top plate will increase remarkably, and durability when a person etc. get on can be further increased.

  A plurality of elastic members can be gathered to form a plurality of rows. If it is like this, the movable floor for seismic isolation structures of the magnitude | size suitable for the width | variety and length of the groove | channel which installs the movable floor for seismic isolation structures can be manufactured with the elastic member of a single specification.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to FIGS.

Example 1
As shown in FIG. 1, the movable floor for a seismic isolation structure according to the first embodiment includes a plurality of elastic members 10 and a top plate 20 that covers an upper portion of the elastic members 10.

  As shown in FIGS. 2 and 3, the elastic member 10 is composed of a long member 11 and a short member 12 in which a stainless steel strip is bent into a letter C. The long member 11 has wings 11b and 11c extending from the central rectangular part 11a so as to spread in a square shape on both sides, and the rectangular part 11a has two bolt holes 11d. In addition, bolt holes 11e and 11f are formed at two locations in the width direction at the center of the wing portions 11b and 11c. The portions from the positions of the bolt holes 11e and 11f of the wing portions 11b and 11c to the tip end portions are elastic pieces 11g and 11h. The short member 12 has wings 12b and 12c extending from the central rectangular portion 12a so as to spread in a square shape on both sides, and the rectangular portion 12a has two bolt holes. Further, the tips of the wing portions 12b and 12c are provided with mounting portions 12e and 12f which are bent outward. Bolt holes 12g and 12h are formed in the mounting portions 12e and 12f at positions aligned with the bolt holes 11e and 11f. It has been. The long member 11 and the short member 12 are coupled together by bolts 13a and nuts 13b fitted in the bolt holes 11e and 11f and the bolt holes 12g and 12h. A cylindrical portion having a hexagonal cross section surrounded by the long member 11 and the short member 12 is a cylindrical portion 14.

  The top plate 20 is formed of a stainless steel plate having an L-shaped cross section. As shown in FIG. 1, the top plate 20 covers a top portion of four elastic members 10 arranged in a row, and the width of the cover portion 20a. It consists of a wall portion 20b that bends downward at one end in the direction. Bolt holes that match the bolt holes 11d of the elastic member 10 are formed at a predetermined pitch in the wall portion 20b, and the elastic member 10 is coupled to the wall portion 20b by bolts and nuts.

<Construction Example 1>
The construction example in the case where it installs below the dog run fixed to the base isolation building about the movable floor for base isolation structure of Example 1 comprised as mentioned above is shown in FIG.4 and FIG.5. The foundation 31 of the seismic isolation building 30 is fixed on the seismic isolation device 32 and faces the groove wall surface 34 across the groove 33 in the standard state. The seismic isolation structure movable floor 35 of the first embodiment is fixed to the upper end of the groove wall 34 by a bolt (not shown). This fixing is performed by screwing a bolt fitted in the bolt hole 11d of the elastic member 10 shown in FIG. The seismic isolation structure movable floor 35 is covered with a dog run 36 protruding from the base isolation building 30.

  As described above, in the seismic isolation structure movable floor 35 installed below the dog run 36, the seismic isolation building 30 moves in the direction in which the width of the groove 33 becomes narrow due to the earthquake motion, and the seismic isolation structure movable floor 35 , The cylindrical portion 14 is elastically deformed in the width direction of the groove, and the elastic pieces 11g and 11h are elastically deformed in the direction in which the fan spreads, and the top plate 20 slides along with the deformation (FIG. 5B). )). Further, when the seismic isolation building 30 moves away from the elastic member 10 in the width direction of the groove 33, the elastically deformed cylindrical portion 14 and the elastic pieces 11g and 11h are restored to the original shape, and the top plate 20 is also restored. Slide to the position (FIG. 5C). For this reason, even if the length of the dog run 36 is shorter than the width of the groove 33 by the width of the top plate 20, the state covered with the top plate 20 can be maintained. For this reason, the length of the dog run 36 can be shortened by the width of the top plate 20, and installation is possible even when there is no wide open space around the seismic isolation building 30.

  In addition, as shown in FIG. 1, the elastic pieces 11 g and 11 h are provided so as to protrude from the tip of the long member 11 in the elastic member 10, so that the pressure received from the top plate 20 does not concentrate on the short member 12. The elastic pieces 11g and 11h are also dispersed. For this reason, the mechanical strength with respect to the pressure from the top plate 20 becomes high, and a person etc. can pass safely on the top plate 20. For this reason, it is not necessary to support the movable floor 35 for seismic isolation structures with the stepped surface of a concrete foundation, and it can be made into a simple space. For this reason, the installation cost of the movable floor for seismic isolation structures can be significantly reduced.

  Furthermore, since the movable floor 35 for the seismic isolation structure according to the first embodiment can be installed simply by fixing it to the upper end of the groove wall surface 34 with a bolt, the construction is easy and the construction cost is low. It is also easy to install by post-construction.

<Construction Example 2>
The movable floor 35 for seismic isolation structure of Example 1 can also be installed under the expansion joint 40 as shown in FIG. Even if it is like this, there exists an effect similar to the above.

(Example 2)
As shown in FIG. 7, the movable floor for the seismic isolation structure according to the second embodiment includes a plurality of double elastic members 40 in which the elastic members 10 according to the first embodiment are connected by two bolts. Yes. The other structure is the same as that of the movable floor for seismic isolation structures of Example 1. In this way, by connecting the elastic member 10, the length that can be expanded and contracted can be increased.

  The movable floor for a seismic isolation structure of the present invention can be used for shielding a groove provided around the seismic isolation structure.

It is a perspective view of the movable floor for seismic isolation structures of Example 1. FIG. It is a top view of an elastic member. It is a disassembled perspective view of an elastic member. It is a construction example when installing the movable floor for seismic isolation structures below the dog run. It is sectional drawing which shows the effect | action at the time of an earthquake in the case of installing the movable floor for seismic isolation structures under the dog run. It is sectional drawing which shows the effect | action at the time of an earthquake in the case of installing the movable floor for seismic isolation structures under the expansion joint. It is a perspective view of the movable floor for seismic isolation structures of Example 2. FIG. It is a perspective view of the elastic member of the conventional movable floor for seismic isolation structures. It is installation sectional drawing of the conventional movable floor for seismic isolation structures.

Explanation of symbols

30 ... Seismic isolation building (base isolation structure)
33 ... Groove 34 ... Groove wall surface 35 ... Movable floor for seismic isolation structure 20 ... Top plate 10 ... Elastic member 14 ... Tube part 11g, 11h ... Elastic piece

Claims (4)

A movable floor for a seismic isolation structure for covering a groove provided around the seismic isolation structure,
A top plate for covering the groove; and an elastic member fixed to the groove wall surface facing the seismic isolation structure, supporting the top plate and slidable in the width direction of the groove,
The elastic member extends from the side surface of the cylindrical portion so as to approach the seismic isolation structure so as to spread in a square shape and supports the top plate. Ri Do and an elastic piece, base isolation structure for a movable floor, characterized in that the bottom of the elastic member, which is a mere space without support.   The movable floor for a seismic isolation structure according to claim 1, wherein the cylindrical portion has a cylindrical shape with a polygonal cross section.   The movable floor for a seismic isolation structure according to claim 1 or 2, wherein one end of the top plate in the width direction is bent downward and has an L-shaped cross section.   The movable floor for a seismic isolation structure according to any one of claims 1 to 3, wherein a plurality of elastic members gather to form a plurality of rows.

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