JP5377890B2 - Seismic isolation structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress an increase in cost and the extension of a construction term and hardly affects a construction plan when arranging a base-isolated device between a lower structure of reinforced concrete construction and a relatively lightweight superstructure of steel construction. <P>SOLUTION: In a base-isolated building A, a base-isolated plate E having a face larger than the horizontal cross section of the column of the lower structure is fixed to the upper end of the column of the lower structure B of reinforced concrete construction, and the base-isolated device D is mounted or fixed on the upper face of the base-isolated plate, and the superstructure C of steel construction is constructed through the base-isolated device. A plate ceiling member 24 for covering the superstructure C from the below is arranged and the ceiling member is supported by the superstructure C in a position which is below the base-isolated plate E of the lower structure B with an interval S2 between the lower structure and the base-isolated plate. Windshield members 40 which prevent the inflow of air from the gaps S2 and allow the relative displacement of the base-isolated plates and the ceiling members are arranged between the base-isolated plates E and the ceiling members 24. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a seismic isolation structure in which a seismic isolation device is interposed on an intermediate floor of a building.

  There are seismically isolated buildings with seismic isolation pits and seismic isolation devices installed in the seismic isolation pits, but there were drawbacks in that the construction of the seismic isolation pits required significant costs and the construction period was protracted. . So, for example, a so-called intermediate floor in which seismic isolation pits are omitted by disposing a seismic isolation device in the middle of the column as in Patent Document 1 or by disposing a seismic isolation device in the head of the column as in Patent Document 2. Seismic isolation structures have been proposed.

  If a seismic isolation pit is provided and the seismic isolation structure includes the first floor, the upper structure may collide with objects or pedestrians placed on the ground due to relative displacement during the earthquake. The floor seismic isolation structure can avoid such a situation. In addition, the intermediate floor seismic isolation structure is preferable because it can be constructed relatively easily when a seismic isolation system is added to an existing reinforced concrete building as well as a new construction.

  The seismic isolation structure extends the natural period of the building (upper structure) to make it difficult to transmit the earthquake vibration to the building (upper structure). As the seismic isolation device, laminated rubber, sliding bearing, rolling bearing, etc. Various types have been developed.

  When using laminated rubber that covers all functions of the superstructure support function, restoration function, and damping function as a seismic isolation device in a lightweight building, the cross-sectional area of the laminated rubber must be reduced to increase the natural period of the building. However, if the cross-sectional area of the laminated rubber is reduced, it may be difficult to support the building load, or buckling may occur during deformation. Conversely, if the cross-sectional area of the laminated rubber is increased in order to support the load, it is difficult to increase the period and a sufficient seismic isolation effect cannot be obtained. Therefore, when light-weight buildings such as low-rise steel-framed houses are used as seismic isolation structures, it is common to adopt a sliding support type or a rolling support type that provides sufficient support and allows easy adjustment of the natural period. is there. In this case, it is necessary to provide a member and a device having a restoring function part and a damping function part separately from the support and the receiving plate that receives the support.

  On the other hand, when the upper structure is made lighter than the reinforced concrete structure as in Patent Document 2, the cross-sectional area of the column of the lower structure can be set small in the structural calculation. In particular, in the case of a low-rise housing, the load capacity can be expected to be smaller than that of buildings for other uses, so the effect of reducing the cross-sectional area of the pillar is great.

JP 2001-115656 A JP 2004-60281 A

  However, as mentioned above, when a seismic isolation device of sliding bearing type or rolling bearing type is adopted to lengthen the natural period of the building and to exert the seismic isolation effect, the bearing is received only by the cross-sectional area of the column based on the structural calculation. It may be difficult to secure a surface on which a backing plate, a member or a device having a restoring function or a damping function is placed.

  In this case, it is possible to enlarge only the column head of the lower structure, such as the head of the bolt, to secure the mounting surface of the seismic isolation device, but build the protruding part integrally with the reinforced concrete column Then, there was a problem that the construction work was complicated in formwork and bar arrangement work, and the construction period was postponed and the cost increased, and there was a problem that the projecting part needed to have an appropriate thickness and the building plan was affected. .

  The present invention solves the above-mentioned problems of the prior art, and when a seismic isolation device is arranged between a reinforced concrete lower structure and a relatively light steel upper structure, the cost increases and the construction period becomes longer. The purpose is to provide a seismic isolation structure that can be controlled and that does not affect the construction plan.

The first structure of the seismic isolation structure according to the present invention for solving the problems of the prior art described above is a reinforced concrete comprising a foundation and a plurality of pillars that project from the foundation in a cantilevered manner to form a first-floor pillar. each pillar upper end of the undercarriage forming, fixing the seismic isolation plate having a large surface than the horizontal cross-section of the column, the seismic isolation device mounted or fixed to the upper surface of該免Shin plate,該免Shin It is characterized in that the 2nd floor pillar of the steel structure upper structure is installed on the 1st floor pillar through the apparatus.

According to a second configuration of the base isolation structure of the present invention, the base isolation device is a sliding support type or a rolling support type, and the base isolation plate is mounted on a receiving plate that receives the base isolation device at the center thereof. provided with a location part, characterized in that it comprises a mounting portion of the periphery to the restoration function unit or the attenuation function portion protruding than and said post a peripheral edge of the receiving receiving plates mounting portion.

Further, the upper structure is plate-shaped roof member covering from below is provided, the ceiling member, the located below the seismic isolation plate, and wherein provided with a gap between the lower structure it is preferably supported on the upper structure at a position spaced between the base isolation plate.

  Further, between the seismic isolation plate and the ceiling member, the inflow of wind from the gap between the seismic isolation plate and the ceiling member to the ceiling member and the lower structure is prevented and the seismic isolation plates It is preferable that a windshield member that allows relative movement between the ceiling member and the ceiling member is provided.

  According to the first configuration of the seismic isolation structure according to the present invention, the seismic isolation device is mounted on the upper surface of the seismic isolation plate having a surface larger than the horizontal sectional area of the column at the upper end of the column of the reinforced concrete substructure. Or since it comprised so that it might fix, it is not necessary to enlarge the cross section of the whole lower column of a reinforced concrete structure, or the upper end part of a lower column according to the structure of a seismic isolation apparatus. Therefore, an economical frame can be constructed, and the construction period is not prolonged.

  According to the second configuration of the base isolation structure according to the present invention, the mounting surface of the support receiving plate on which a large vertical load acts on the center portion of the base isolation plate, that is, the portion supported by the column of the lower structure is formed. In addition, since the mounting portion of the restoring portion function or the damping function portion where a large vertical load does not act is formed on the periphery protruding from the column of the lower structure, the seismic isolation plate can be made thin.

Therefore, the absolute height of the building can be suppressed, and the volume of the protruding portion into the lower structure can be reduced, thereby reducing the influence on the building plan.

  In addition, since the attachment portion of the restoration function portion or the attenuation function portion protrudes and the space below is a space, the fixing operation of the restoration portion or the attenuation portion can be easily performed.

  Moreover, according to the 3rd structure of the seismic isolation structure which concerns on this invention, the upper surface of a seismic isolation plate will be covered with a ceiling member with the lower surface of a lower structure. For this reason, while improving the designability by a ceiling member, it can suppress that dust, dust, etc. accumulate on the upper surface of this seismic isolation plate.

  Note that due to the gap between the seismic isolation plate or the upper structure and the ceiling member, the vibration of the upper structure with respect to the seismic isolation plate due to seismic motion or the like is naturally allowed.

Further, a cross wind or the like flows below the upper structure, that is, between the lower structures. In this case, by providing the ceiling member as described above, the ceiling member and the lower structure are interposed via the gap. It is considered that an excessive external force in a direction away from the upper structure acts on the ceiling member in combination with the generation of the negative pressure due to the cross wind. On the other hand, according to the fourth configuration of the seismic isolation structure according to the present invention, a windshield member is provided in the gap, whereby the inflow of a cross wind or the like through the gap can be remarkably restricted, and the ceiling External force acting on the member can be reduced.

  A most preferred embodiment of the seismic isolation structure according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a base-isolated building A to which the base-isolated structure according to the present invention is applied, FIG. 2 is a cross-sectional view mainly of a lower structure B of the base-isolated building A, and FIG. 4 is a detailed view around the seismic isolation plate E, FIG. 5 is a diagram showing a fixing procedure of the seismic isolation plate E, and FIG. 6 is a diagram showing a construction procedure of the upper structure using the seismic isolation plate E. FIG. 7 is an enlarged plan view showing the seismic isolation plate E and its surroundings. FIG. 8 is a side view of the seismic isolation device D and the eaves ceiling. FIG. 9 is a sectional view around the windshield member. FIGS. 10A and 10B are cross-sectional views showing another embodiment of the windshield member.

  First, the whole structure of the seismic isolation building A is demonstrated with reference to FIG. The base-isolated building A is a three-story house, the first floor is a piloti except the entrance and the staircase, and the second and third floors are rooms. As the structure type, the foundation 1 and the column (first floor pillar) 2 constituting the lower structure B are reinforced concrete, and are composed of the second and third floor pillars 3 and the large beams 4a to 4c constituting the upper structure C. The frame is steel-framed, and it consists of a span in the wife direction and two spans in the girder direction.

  Next, the configuration of the lower structure B will be described with reference to FIGS. 1 and 2. The lower structure B has a solid foundation type foundation 1, and a column 2 rises from the foundation 1. The column base 2b of the column 2 is rigidly fixed by the foundation beam 1a and the pressure platen 1b, but the column head 2a is not connected by the beam, and the column 2 protrudes in a cantilever state. The diameter of the cylinder 2 is set to 700 mm based on the load acting from the upper structure C. In addition, 1c is the soil concrete which comprises the floor of a piloti.

 Next, the configuration of the upper structure C will be described with reference to FIGS. In the upper structure C, the pillar 3 is formed of a 150 mm square seamless (not having a seam in a horizontal cross section) rectangular steel pipe, and is arranged in the same position as the cylinder 2 in a plan view. A bolt hole is drilled at a predetermined position on the side surface of the column 3 to form a beam joint 3a to which large beams 4a to 4c, which will be described later, are joined. 3 is formed integrally.

  The large beams 4a to 4c connecting the adjacent columns 3 are made of H-section steel. Joined plates 4a1 to 4c1 having bolt holes drilled at positions corresponding to the bolt holes formed in the beam joint portion 3a of the column 3 are welded to both ends of the H-shaped steel. The beam joint 3a is metal touched and rigidly joined with a high strength bolt.

  The cantilever beams 5a to 5c made of H-shaped steel having the same cross section as the large beams 4a to 4c are formed on the beam joint portion 3a in the outer direction of the building where the large beams 4a to 4c are not joined among the beam joint portions 3a of the column 3. The joining plates 5a1 to 5c1 that are arranged and configured similarly to the joining plates 4a1 to 4c1 of the large beams 4a to 4c are welded to one end of these cantilever beams 5a to 5c. The beam joint 3a is metal touched and rigidly joined with a high strength bolt.

  Nose tip beams 6a to 6c made of H-shaped steel having the same cross section as the large beams 4a to 4c are attached to the distal ends of the cantilevers 5a to 5c.

  A small beam (not shown) made of H-shaped steel is appropriately bridged between the opposed large beams 4a to 4c, and a floor panel 9 made of an ALC panel is supported by the various beams to constitute a floor 10.

  A metal fitting (not shown) for supporting and positioning the outer wall panel is attached to the flanges of the nose tip beams 6a to 6c, and the outer wall panel 7 made of an ALC (lightweight cellular concrete) panel is fixed by the hardware to constitute the outer wall 8. ing.

  The floor 10 of the upper structure C protrudes from the column 3 by the cantilever beams 5a to 5c and the nose tip beams 6a to 6c, and the seismic isolation plate E and the seismic isolation device D, which will be described later, are arranged in the area of the floor surface. Is done.

  Next, the structure of the seismic isolation apparatus D is demonstrated with reference to FIG. 2, FIG. The seismic isolation device D used in this embodiment is of a sliding bearing type, and includes a sliding bearing 11 having a supporting function and a receiving plate 13, a restoring rubber 14 having a restoring function, and an oil damper 15 having a damping function. . The sliding bearing 11 is formed integrally with the column 3 at the lower end of the column 3. The size of the sliding surface 11a of the sliding bearing 11 is such that even when the upper structure C is displaced to the maximum, the vertical load from the upper structure C acts only on the seismic isolation plate E, and no bending acts. Is set to

  Next, the configuration of the seismic isolation plate E will be described with reference to FIG. The seismic isolation plate E is a member for mounting or fixing the seismic isolation device D. The material is made of steel with a rust-proof coating on the surface. In addition, what gave rust prevention processing, such as hot dip galvanizing, instead of rust prevention coating may be used. The shape is a disk shape having an outer diameter of 1370 mm and a thickness of 29 mm, and an annular protrusion 12 that regulates the moving range of the sliding bearing 11 is welded to the upper surface, and the inner surface of the protrusion 12 is the receiving plate mounting portion. It is 16. The diameter of the receiving plate mounting portion 16 is set to 890 mm based on the relative maximum displacement calculated from the seismic isolation effect required for the upper structure C.

  Bolt holes 17a for fixing the restoring rubber 14 and the oil damper 15 to the bolts are formed in the peripheral edge portion 17 outside the protruding portion 12. The bolt holes 17a are formed at four equal intervals (90 degree intervals), and there are four or six holes corresponding to the bolt holes of the corresponding functional members (the restoring rubber 14 or the oil damper 15). It has been drilled.

  In the center of the receiving plate mounting portion 16, an injection hole 16a for grout injection and an adjustment tool hole 16b for adjusting the level of the seismic isolation plate E by operating the level adjustment tool 20 are formed. Further, on the lower surface of the seismic isolation plate E, a plurality of stud dowels 18 for fixing the seismic isolation plate E to the column head 2a of the cylinder 2 are projected.

  As shown in FIG. 4, the column head 2 a of the column 2 is laid with concrete slightly lower than the installation level of the seismic isolation plate E, and the winding pipe 19 is pre-embedded to embed the stud gibber. A hole 2c is formed. An anchor hole 2d for driving the level adjuster 20 of the seismic isolation plate E is drilled after the concrete is hardened, and a driving anchor 21 is driven into the anchor hole 2d.

  As shown in FIGS. 4 and 5, the level adjuster 20 welds a male threaded shaft 20 a 2 to the lower surface of a circular support plate 20 a 1 that supports the seismic isolation plate E, and a high nut 20 a 3 to the upper surface. And a holding part 20b in which a rectangular pressing plate 20b2 is welded to the neck of the temporary fixing bolt 20b1.

  Next, the procedure for fixing the seismic isolation plate E will be described with reference to FIG. The seismic isolation plate E is fixed to the upper surface of the cylinder 2 using the level adjuster 20 in the following manner.

  First, as shown in FIG. 5A, an anchor hole 2d is drilled at a predetermined position of the column head 2a of the cylinder 2, and the anchor 21 is driven into the anchor hole 2d. Next, as shown in FIG. 2B, the shaft 20a2 of the support portion 20a of the level adjuster 20 is screwed into the female screw of the driving anchor 21, and the support plate 20a1 is adjusted to a predetermined level.

  Next, as shown in FIG. 4C, the seismic isolation plate E is placed on the support portion 20a so that the positions of the support portion 20a and the adjustment tool hole 16b coincide with each other, and the four bolt holes 17a. Position in a plane so that the position of the group is on the core. Then, the holding portion 20b is screwed into the high nut 20a3 of the support portion 20a, and the seismic isolation plate E is temporarily fixed.

  Next, as shown in FIG. 4D, the grout 22 is injected into the gap 2e between the seismic isolation plate E and the concrete constituting the column 2 from the injection hole 16a. (The seismic isolation plate E is fixed at a predetermined position by the solidification of the grout 22)

  As shown in FIG. 5E, after the grout 22 is solidified, the pressing portion 20b is removed. Next, as shown in FIG. 5F, the grout 23 is injected into the adjustment tool hole 16b. Through the above procedure, the seismic isolation plate E can be fixed to the column head 2a of the cylinder 2.

  Next, the construction procedure of the upper structure C and the seismic isolation device D will be described with reference to FIG. The receiving plate 13 is placed on the receiving plate mounting portion 16 of the seismic isolation plate E fixed to the upper portion of the cylinder 2 as described above, and the pillar 3 integral with the support 11 is placed on the receiving plate 13. Are built, and beams including the large beams 4a to 4c and the cantilever beams 5a to 5c are joined to construct a frame of the upper structure C. Then, one end of the restoring rubber 14 and the oil damper 15 is fixed to the peripheral edge 17 of the seismic isolation plate E using the bolt hole 17a, and the other end is fixed to the bolt hole of the lower flange of the second beam 4a.

  Further, an eaves ceiling (ceiling member) 24 is suspended from the large beam 4a on the second floor at a level slightly below the seismic isolation plate E, and covers the lower surface of the upper structure C. As will be described later, the eaves ceiling 24 has a clearance (gap S1, S2 (see FIG. 8)) between the eaves ceiling 24 and the cylinder 2 so as not to be damaged by colliding with the side surface of the cylinder 2 during an earthquake. E protrudes from the cylinder 2.

  In the above configuration, the calculation of the cross-sectional area of the cylinder 2 is performed based on the load of the upper structure C, and the region necessary for mounting and fixing the seismic isolation device is secured by the seismic isolation plate E having a larger diameter than the cylinder. Economic structure can be constructed in a short construction period.

  In addition, since the space below the bolt hole 17a of the seismic isolation plate E is opened and the space is secured, the fixing work of the restoring rubber 14 and the oil damper 15 can be easily performed.

  In addition, since the movement range of the upper structure C is limited by the protrusions 12, even if the upper structure C is displaced to the maximum during an earthquake, the pillar 3 is out of the region above the cylinder 2. In addition, the restoring rubber 14 and the oil damper 15 are not members that support the vertical load of the upper structure C. Therefore, the seismic isolation plate E is not bent greatly even when the peripheral edge portion 17 is cantilevered, so that it is not necessary to give it thickness or to reinforce it, and a sufficient strength can be obtained with a thin and flat shape.

  In addition, since the seismic isolation plate E protrudes beyond the column 2, the lower surface of the upper structure C cannot be seen even when looking upward from the piloti, and the aesthetic appearance of the seismic isolation building A can be maintained. Further, as described above, since the seismic isolation plate E is smaller in thickness than the case where it is made of reinforced concrete, the installation level of the eaves ceiling 24 can be set high, and the effective height of the piloti can be secured large.

  Another application of the seismic isolation plate E will be described with reference to FIG. The bolt hole 17a of the seismic isolation plate E is also used in the construction of the upper structure C in the following manner.

  That is, as shown in FIG. 6A, the upper and lower flanges have bolt holes 17a and bolt holes corresponding to the positions of the bolt holes of the flange of the second-order large beam 4a in the U-shaped cross section. A temporary metal fitting 25 designed to be in a final position where the large beam 4a on the second floor is connected to the pillar 3 is fixed on the seismic isolation plate E using the bolt holes 17a, and Then, the large beam 4a on the second floor is fixed on the temporary hardware 25.

  Next, as shown in FIG. 2B, the beam joint portion 3a of the column 3 is brought into contact with the joining plate 4a1 provided on the second-floor large beam 4a to be bolt-joined. When the second-floor girder 4a exists in two opposite directions, the second-floor girder is slid in the lateral direction (front-rear direction in the figure) of the second-floor girder 4a with the pillar 3 standing vertically. A fitting bolt is joined between 4a.

  After joining the second floor girder 4a and the column 3, the temporary fixture 25 is detached from the seismic isolation plate E and the second floor girder 4a, so that the second floor girder 4a is pillared as shown in FIG. 3 can be supported.

  By adopting such a construction method, it is possible to stably hold the lower end portion of the column 3 of the unstable upper structure C without fixing the column base portion with the anchor bolt, and subsequent construction work Can be performed accurately and promptly.

  7 and 8, a plurality of suspension members 31 are attached to the large beam 4a located at the bottom of the upper structure C, and a suspension plate 32 is provided at the lower end of each suspension member 31. Yes. Further, a field edge receiver 33 is installed over the lower end of the suspension plate 32 adjacent in the beam direction, and a field edge 34 is installed over the lower parts of the plurality of field edge receivers 33. Each field edge 34 is installed in a state of being orthogonal to the field edge receiver 33, whereby a lattice-shaped base 35 is assembled by the field edge receiver 33 and the field edge 34. The field edge receiver 33 and the field edge 34 are supported at a position below the seismic isolation plate E of the lower structure B, and a plurality of plate-like ceiling members (described above) are provided below the field edge 34. The eaves ceiling 24 is shown, and the member will be referred to as a ceiling member 24 below) 24 is attached. In the present embodiment, a configuration in which the suspension member 31 or the like is suspended on the large beam 4a is disclosed, but a configuration in which the suspension member 31 or the like is suspended on a small beam provided between the large beams can also be employed.

  Further, the lower end portion of the outer wall 8 of the upper structure C is also extended below the large beam 4a of the upper structure C, and a holder 8a for holding the ceiling member 24 is provided at the lower end portion. .

  The ceiling member 24 is formed in a flat plate shape using calcium silicate as a main material, and is laid in a state of being supported by the field edge 34 and the holder 8a. The ceiling member 24 that overlaps the lower structure B includes an arc portion 37 that follows the shape of the lower structure B. When the ceiling member 24 is laid, an edge portion and a lower portion of the arc portion 37 are provided. A sufficient gap S <b> 1 is interposed between the outer peripheral surfaces of the structures B. Further, the ceiling member 24 is supported at a position below the seismic isolation plate E, whereby a sufficient gap S2 is interposed between the ceiling member 24 and the seismic isolation plate E. Further, the radius of the arc portion 37 of the ceiling member 24 is set to be the same as or slightly smaller than the radius of the seismic isolation plate E, whereby the outermost edge portion of the seismic isolation plate E and the arc portion 37 of the ceiling member 24 are set. Are facing each other.

  The gaps S1 and S2 become play for the relative movement of the upper structure C with respect to the lower structure B and the seismic isolation plate E due to seismic motion and the like, and thereby the lower structure B and the seismic isolation plate E and the ceiling member 24 Collisions and interferences are prevented.

  Further, according to the embodiment, the upper surface of the seismic isolation plate E is covered with the ceiling member 24 together with the lower surface of the upper structure C. For this reason, by covering up the lower surface of the upper structure C with the ceiling member 24, the design of the first floor piloti below the upper structure C is improved and the lower surface of the upper structure C is flat. By doing so, the passage of the cross wind passing through the first-floor piloti is stabilized, and further, accumulation of dust and dirt on the upper surface of the seismic isolation plate E is suppressed.

  Further, as described above, since the gap S2 is secured between the seismic isolation plate E and the ceiling member 24, the space behind the ceiling member 24 above the ceiling member 24 is passed through the gap S2. A cross wind flows into the ceiling member 24 and, due to this, combined with the negative pressure acting on the ceiling member 24 due to the cross wind, an excessive external force is applied to the ceiling member 24 to separate the ceiling member 24 from the upper structure C. It is possible. In order to cope with such a situation, in the present embodiment, a windshield member 40 is provided in the gap S <b> 2 between the seismic isolation plate E and the ceiling member 24.

  As shown in FIG. 9, the windshield member 40 is attached to an arc portion 37 of the ceiling member 24, and includes an arc-shaped rising portion 41 that rises along the arc portion 37, and an upper end portion of the rising portion 41. And a bent portion 42 that is bent and extends along the lower surface of the seismic isolation plate E. In order to ensure the relative movement of the upper structure C with respect to the lower structure B, a very slight gap is formed between the bent portion 42 of the windshield member 40 and the lower surface of the seismic isolation plate E. The gap S <b> 2 between the seismic isolation plate and the ceiling member 24 is substantially closed, so that the inflow of a cross wind or the like through the gap S <b> 2 is remarkably restricted, and the above-described external force acting on the ceiling member 24 is significantly reduced. . Further, entry of dust, insects, and the like from the gap S2 is limited, and it becomes possible to keep the upper surface of the seismic isolation plate E as a sliding surface of the sliding surface 11c of the support 11 of the upper structure C clean. In addition, the back side of the ceiling member 24 that is difficult to clean is also kept clean over a long period of time.

  If the seismic isolation plate E and the ceiling member 24 can be moved relative to each other, the bent portion 42 of the windshield member 40 is brought into contact with the lower surface of the seismic isolation plate E so that the bent portion 42 can be moved in the event of an earthquake or the like. It is also possible to adopt a configuration in which sliding is performed on the rear surface of the seismic isolation plate E. According to this, the gap S2 is substantially completely cut off, and the inflow of cross wind and dust to the back side of the ceiling member 24 through the gap S2 is almost completely cut off.

  FIG. 10A to FIG. 10D show another embodiment of the windshield member 40. As shown in FIG. 10A, the windshield member 40 may be configured to be attached to the lower surface of the seismic isolation plate E. The windshield member 40 is bent from the contact portion 44 that contacts the lower surface of the seismic isolation plate E, the hanging portion 45 that is suspended from the inner end portion of the contact portion 44, and the lower end portion of the hanging portion 45. It is formed in a U-shaped cross section including a bent portion 46 along the upper surface of the field edge 34 that supports the member 24. According to the present embodiment, the gap S2 between the seismic isolation plate E and the ceiling member 24 is substantially blocked by the field edge 34 and the windshield member 40, and the inflow of cross wind to the back side of the ceiling member 24 is remarkable. Be limited.

  Further, the windshield member 40 shown in FIG. 10B is formed in a sheet shape, is attached to the outermost edge portion of the seismic isolation plate E, and hangs down to a position covering the arc portion 37 of the seismic isolation plate E. A gap S <b> 2 between the seismic isolation plate E and the ceiling member 24 is closed by the member 40. As a result, the inflow of cross wind through the gap S2 is significantly limited.

  FIG. 10C shows a configuration in which the field edge 34 is not provided at the position where the seismic isolation plate E and the ceiling member 24 overlap, and the windshield member 40 is covered with the edge of the seismic isolation plate E. A mounting portion 47, a hanging portion 48 that hangs down from an end portion of the covered portion 47, and a facing portion 49 that is bent from the tip portion of the hanging portion 48 and faces the back surface of the ceiling member 24 with a slight gap. I have. The gap 48 between the seismic isolation plate E and the ceiling member 24 is substantially blocked by the hanging portion 48, and there is only a slight gap between the facing portion 49 and the ceiling member 24. The intrusion of the cross wind toward the space on the back side of the door is remarkably blocked.

  10 (d) shortens the hanging portion 48 of the windshield member 40 of FIG. 10 (c), and is provided with a protruding portion 50 made of an elastic material from the lower surface of the facing portion 49. The tip of the portion 50 is in contact with the arc portion 37 of the ceiling member 24. As a result, the gap S <b> 2 between the seismic isolation plate E and the ceiling member 24 is blocked, and the intrusion of the cross wind toward the space on the back side of the ceiling member 24 is blocked. Further, even when the upper structure C vibrates due to seismic motion or the like, the projecting portion 50 made of an elastic material is appropriately deformed along with the vibration of the upper structure C. Therefore, the ceiling member of the projecting portion 50 The contact with 24 does not block the vibration of the upper structure C. Further, according to this configuration, even when the upper structure C moves up and down with respect to the lower structure B during an earthquake or the like, the ceiling member 24 moves up and down below the facing portion of the windshield member 40. Thus, the ceiling member 24 does not come into contact with the windshield member 40 due to the vertical movement, so that damage to these members and surrounding members due to contact between the ceiling member 24 and the windshield member 40 is also avoided.

  Further, the windshield member 40 may be formed of a material having elasticity such as rubber, and may adopt a configuration in which one is fixed to the seismic isolation plate E and the other is fixed to the ceiling member 24. According to such a configuration, the gap S2 between the seismic isolation plate E and the ceiling member 24 is completely closed by the windshield member 40, and the inflow of the cross wind through the gap S2 is almost completely blocked. Further, since the windshield member 40 has elasticity, it can be said that the windshield member 40 is fastened to the ceiling member 24 supported by the upper structure C and the seismic isolation plate E supported by the lower structure B. However, the windshield member 40 expands and contracts with the relative movement of the upper structure C, and the response performance of the upper structure C to vibrations such as seismic motion is sufficiently exhibited.

  The seismic isolation plate E shown in FIG. 10B is made of reinforced concrete and is formed integrally with the lower structure B. Even when the seismic isolation plate E is employed, the same effects as those of the embodiment of the present invention are achieved.

  The seismic isolation structure of the present invention can also be applied to a building having a lower structure having two or more layers and a building in which the upper structure is made of a light wooden structure like a steel frame.

It is a perspective view of the base isolation building A to which the base isolation structure according to the present invention is applied. It is sectional drawing of the lower structure B mainly of the seismic isolation building A. FIG. It is a detailed view around the seismic isolation device D. It is a detailed view around the seismic isolation plate E. It is a figure which shows the fixed point of the seismic isolation plate E. FIG. It is a figure which shows the construction procedure of the upper structure using the seismic isolation plate E. FIG. It is a top view which expands and shows the seismic isolation plate E and its circumference | surroundings. It is a side view around the seismic isolation device D and the eaves ceiling. It is sectional drawing around a windshield member. (A) And (b) is sectional drawing which shows the other Example of a windshield member.

Explanation of symbols

A ... Seismic isolation building B ... Lower structure C ... Upper structure D ... Seismic isolation device E ... Seismic isolation plate S1 ... Gap S2 ... Gap 1 ... Foundation 1a ... Base beam 1b ... Pressure panel 1c ... Soil concrete 2 ... Cylinder ( 1st floor pillar)
2a ... pillar head 2b ... pillar leg 2c ... embedding hole 2d ... adjusting tool hole 2e ... gap 3 ... pillar 3a ... beam joint 4a-4c ... large beam 4a1-4c1 ... joining plate 5a-5c ... cantilever 5a1 5c1 ... Joint plate 6a-6c ... Nose tip beam 7 ... Outer wall panel 8 ... Outer wall 8a ... Holding tool 9 ... Floor panel 10 ... Floor 11 ... Support 11a ... Sliding surface 12 ... Protrusion 13 ... Receiving plate 14 ... Restoring rubber 15 ... Oil damper 16 ... Base plate mounting part 16a ... Injection hole
16b ... Level adjustment hole 17 ... Peripheral part 17a ... Bolt hole 18 ... Stud gibber 19 ... Winding pipe 20 ... Level adjustment tool 20a ... Supporting part 20a1 ... Support plate 20a2 ... Shaft 20a3 ... High bolt 20b ... Holding part 20b1 ... Temporary fixing bolt 20b2 ... presser plate 21 ... driven anchor 22, 23 ... grout 24 ... eaves ceiling (ceiling member)
25 ... Temporary fittings 33 ... Field edge receiver 34 ... Field edge 35 ... Base 40 ... Windshield member

Claims (4)

Seismic having a foundation, each pillar upper end of the plurality of pillars and reinforced concrete substructure consisting of forming a protruding by 1 Kaibashira in a cantilevered state from the foundation, the large surface than the horizontal cross-section of the column Fix the seismic plate,
Place or fix the seismic isolation device on the upper surface of the seismic isolation plate,
A seismic isolation structure characterized in that a second-order pillar of a steel frame upper structure is installed on the first-floor pillar via the seismic isolation device. The seismic isolation device is a sliding bearing type or a rolling bearing type;
The seismic isolation plate is provided with a receiving plate mounted portion for receiving the seismic isolation device at the center thereof, restoring functional unit or attenuate the periphery that protrudes than and said post a peripheral edge of the receiving receiving plates mounting portion seismic isolation structure according to claim 1, characterized in that it comprises a mounting portion of the functional unit. A plate-like ceiling member that covers the upper structure from below is provided,
The ceiling member is positioned below the seismic isolation plate, and, supported on the upper structure at a position spaced between said seismic isolation plate provided with a gap between the lower structure The seismic isolation structure according to claim 1, wherein the seismic isolation structure is provided.   Between the seismic isolation plate and the ceiling member, the flow of wind from the gap between the seismic isolation plate and the ceiling member to the ceiling member and the lower structure is prevented and the seismic isolation plate and the ceiling The seismic isolation structure according to claim 3, further comprising a windshield member that allows relative movement with the member.

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