JP2007077617A - Mounting structure of base isolating device, its construction method, and base plate for mounting base isolating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of a base isolating device, its construction method, and a base plate for mounting the base isolating device that can considerably simplify construction of an anchoring part for integrally joining the base plate for mounting the base isolating device, to an upper frame or a lower frame. <P>SOLUTION: The mounting structure of the base isolating device has the base isolating device 5 installed on a building foundation 1, and an upper base plate 17 for mounting the base isolating device, provided between the base isolating device and the upper frame 4 made of concrete and constructed at the bottom part of a building body 3. The upper base plate is formed of a half-precast concrete slab with a truss reinforcement 19 integrated with cap nuts 20 for screwing bolts 18 for fixing the upper base plate, to the upper face of the base isolating device, and the truss reinforcement is integrally embedded in the upper frame to join the upper base plate to the upper frame. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a seismic isolation device mounting structure capable of greatly simplifying the construction of a fixing portion for integrally joining a base plate for mounting a base isolation device to an upper frame or a lower frame, and a method for the same. And a base plate for mounting a seismic isolation device used for them.

  Conventionally, the mounting structure for mounting the seismic isolation device between the foundation of the building and the main body is as shown in FIG. 7, for example. That is, between the seismic isolation device 81 installed on the foundation 80 of the building and the concrete upper frame 83 constructed at the bottom of the building main body 82, an upper base plate for mounting the seismic isolation device made of steel is used. 84, and the lower surface side of the upper base plate 84 uses fasteners such as bolts 85 and cap nuts 86 on the upper end surface of the seismic isolation device 81, that is, the upper surface of the upper flange plate 81a of the seismic isolation device 81. Fixed. Therefore, a bolt hole for screwing the bolt 85 is formed in the upper base plate 84, and a cap nut 86 is welded at a position corresponding to the bolt hole. The surface of the upper base plate 84 that is in contact with the seismic isolation device 81, that is, the lower surface side, is required to have high smoothness so that it closely contacts the upper end surface of the seismic isolation device 81.

  However, as shown in FIG. 8, on the upper surface side of the upper base plate 84, a plurality of anchor bolts 87 (see FIG. 8) are embedded in the cap nut 86 and the upper frame 83 to constitute a fixing portion (anchor). 8 and 9 are welded to each other, and the upper base plate 84 is likely to be welded to form a wavy warp. When such strain occurs, the vertical contact force between the upper base plate 84 and the seismic isolation device 81 is not evenly distributed, and the frictional resistance against horizontal vibration is not fully exhibited. In addition, the fastening force for joining the upper end surface of the seismic isolation device 81, that is, in this example, the fastening force between the bolt 85 and the cap nut 86 becomes uneven, and the fastening force is reduced as a whole. .

  In order to avoid such a problem, the upper base plate 84 has a certain thickness or more, for example, a thickness of about 25 mm, and needs to be manufactured by an advanced technique so that the warp hardly occurs even if it is welded. As a result, the manufacturing cost has become very high. In addition, when the size of the upper base plate 84 is smaller than the plane size of the upper frame 83 as shown in FIG. 7, when the concrete of the upper frame 83 is placed, it is covered by a part of the lower surface, that is, the upper base plate 84. Since it was necessary to provide the formwork F in the part which does not exist, and also it was necessary to provide the support work S which supports this formwork, these installation and dismantling took time and were disadvantageous.

  The above situation was exactly the same for the lower base plate 89 for attaching the seismic isolation device provided between the concrete lower frame 88 and the seismic isolation device 81 standing on the foundation 80 of the building. FIG. 9 shows a plan view of the lower base plate 89. The cap nut 86 and the anchor bolt 87 are welded so as to protrude toward the lower surface, that is, the lower frame 88, and the lower frame 88 is placed. The structure is substantially the same as that of the upper base plate 84 except that the concrete filling hole 90 is formed, and the above disadvantages are also the same.

Therefore, as a technique using a base plate made of precast concrete (hereinafter referred to as PCa) instead of a base plate for attaching a seismic isolation device made of a steel plate, for example, one disclosed in Patent Document 1 is known. Patent document 1 “Attachment method of seismic isolation device in construction of building structure” belongs to the technical field for attaching the seismic isolation device when constructing the lower foundation, and includes a lower base plate made of PCa (“lower anchor” Plate ”) to the anchor frame provided in the concrete placement space of the lower platform (“ foundation rising portion ”) via anchor bolts, and concrete is placed in the concrete placement space to attach the lower platform. And a step of integrally joining the lower pedestal and the lower base plate, and a step of fixing the lower flange plate of the seismic isolation device on the lower base plate via a bolt screwed into a nut. Item 1 ”). A plurality of long nuts are integrally formed in a thickness direction (vertical direction) in a lower base plate having a uniform plate thickness that is preliminarily molded using high-strength concrete in a factory. At the time of construction in the field, the anchor bolts, which are embedded and integrated in the concrete of the lower frame, are screwed in and attached to the lower parts of the long nuts, and the lower parts of these anchor bolts are welded to the anchor frame (" DESCRIPTION OF THE PREFERRED EMBODIMENTS ", paragraph numbers 0010, 0011, etc.). It is also disclosed that a PCa base plate similar to the lower base plate is used for the upper base plate (“upper anchor plate”). In this case, the same as the lower base plate is provided on the upper flange plate of the seismic isolation device. After positioning the upper base plate of uniform thickness with a plurality of long nuts integrally penetrated in the thickness direction in PCa, fixing the upper base plate on the upper flange plate, the upper base plate ("upper foundation" Anchor bolts that are embedded and integrated in the concrete are screwed onto the tops of the long nuts and attached, and after the formation of reinforcing bars and anchor frames for the upper frame and concrete placement, the upper frame is (See “Embodiments of the Invention”, paragraph numbers 0017, 0018, etc.). A plurality of long nuts and anchor bolts are provided in both the upper base plate and the lower base plate (see FIG. 4 and the like).
JP 10-88853 A

  By the way, in the background art of the above-mentioned patent document 1, in order to integrally join the base plate for attaching the seismic isolation device to the upper frame or the lower frame, the base plate is embedded and integrated in the concrete of the upper frame or the lower frame. As mentioned above, anchor bolts were used as the fixing part, but as described above, the installation method is to install the anchor bolts by screwing them into the long nuts of the upper base plate or the lower base plate, respectively, and then assembling them in the upper frame or the lower frame. After welding to the anchor frame, the concrete was placed on the upper frame or the lower frame and buried in one piece to form a fixing part. In addition, since a plurality of these long nuts and anchor bolts are provided in each of the upper base plate and the lower base plate, it is necessary to perform the number of operations such as screwing and welding, which is very troublesome as a whole. It was.

  The present invention was devised in view of the above-described conventional problems, and greatly simplifies the construction of a fixing unit for integrally joining a base plate for mounting a seismic isolation device to an upper frame or a lower frame. An object of the present invention is to provide a seismic isolation device mounting structure, a construction method thereof, and a base plate for the seismic isolation device used therein.

  The seismic isolation device mounting structure according to the present invention is provided between a seismic isolation device installed on the foundation of a building, and the seismic isolation device and a concrete upper frame constructed at the bottom of the building body. An upper base plate for mounting the base isolation device, and the upper base plate is integrated with a truss bar and a cap nut for screwing a bolt for fixing the upper base plate to the upper surface of the base isolation device. It consists of a half precast concrete board, The said truss reinforcement is joined to the said upper frame by being embed | buried under the said upper frame integrally, It is characterized by the above-mentioned.

  The planar shape of the upper base plate covers the entire lower surface of the upper frame.

  In addition, it has a lower base plate for mounting the base isolation device provided between the base isolation device and a concrete lower frame installed on the foundation of the building, the lower base plate, It is made of a half precast concrete plate integrated with a cap nut for screwing a bolt for fixing the seismic isolation device on the lower base plate, and the truss bar is embedded in the lower frame integrally. It is characterized by being joined to the lower cradle.

  The construction method of the base isolation device mounting structure according to the present invention includes the step of fixing the upper base plate on the upper surface of the base isolation device, and constructing the upper frame by placing concrete on the upper base plate And a step of joining the upper base plate and the upper frame.

  In addition, the lower base plate is positioned and arranged on the concrete placement space of the lower frame, and the lower frame is constructed by placing concrete in the concrete placement space of the lower frame. It has the step which joins a base plate and the said lower base, and the step which fixes the said seismic isolation apparatus to the upper surface of the said lower base plate, It is characterized by the above-mentioned.

  In addition, the step of positioning and positioning the lower base plate includes a step of preventing a displacement of the lower base plate by fixing the truss bars of the lower base plate to the foundation side of the building.

  In addition, the base plate for mounting the seismic isolation device according to the present invention is installed on the base of the building, the concrete upper frame constructed on the bottom of the building main body, or the foundation of the building. A base plate for mounting a seismic isolation device provided between a concrete base and a cap nut for screwing a truss bar and a bolt for fixing the seismic isolation device to the base plate for mounting the seismic isolation device And a half precast concrete plate integrated with each other, and the truss bar is integrally embedded in the upper frame or the lower frame, thereby being joined to the upper frame or the lower frame. .

  In the seismic isolation device mounting structure, its construction method, and the base isolation device mounting base plate according to the present invention, the fixing portion for integrally joining the base isolation device mounting base plate to the upper frame or the lower frame Can be greatly simplified.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a base isolation device mounting structure, a construction method thereof, and a base plate for mounting a base isolation device according to the present invention will be described in detail with reference to the accompanying drawings. The construction method of the mounting structure of the seismic isolation apparatus concerning this embodiment is shown in FIGS. The seismic isolation device mounting structure of the present embodiment basically includes a concrete lower frame 2 erected on a building foundation 1, for example, a foundation beam, an upper part of the lower frame 2, and a building body 3 This is a structure in which a seismic isolation device 5 is attached to a concrete upper gantry 4 constructed at the bottom.

  First, as shown in FIG. 1, a lower base plate 6, which is a base plate for seismic isolation devices, is positioned and disposed on a concrete placement space 2 a of a lower frame 2 erected on a foundation 1 of a building. Specifically, the lower base plate 6 is first placed on the level adjustment frame 7 constructed in the concrete placement space 2a of the lower pedestal 2 via level adjustment bolts 8 protruding from the lower surface of the lower base plate 6. To do. The horizontal position of the lower base plate 6 is positioned by the arrangement of the level adjusting frame 7, and the height of the lower base plate 6 is adjusted by adjusting the level adjusting bolt 8 screwed into the bolt hole 7a formed at the upper end of the level adjusting frame 7. Adjust the position. Further, in preparation for concrete placement in the concrete placement space 2a of the lower pedestal 2, a formwork F1, reinforcement not shown, and the like are installed.

  As shown in the plan view of FIG. 5, the lower base plate 6 includes a plurality of truss bars 9 and a plurality of cap nuts 11 for screwing bolts 10 for fixing the seismic isolation device 5 onto the lower base plate 6. It consists of an integrated half precast concrete plate. The upper part of the truss bar 9 and the cap nut 11 is integrally embedded in the half precast concrete plate, and the lower part thereof is provided so as to protrude downward. The lower part of the cap nut 11 does not necessarily have to protrude downward. However, by adopting a structure that protrudes downward as in the present embodiment, the lower part of the truss bar 9 has the same structure as that of the lower part of the truss bar 9 in the concrete 14. It is preferable because it is embedded and integrated and exhibits a fixing effect. Further, a flange-shaped flange portion 11a is formed at the lower end of the cap nut 11 of the present embodiment, and the formation of such a flange portion 11a further enhances the fixing action of the lower pedestal 2 in the concrete 14. This is preferable. The position of the upper end of the cap nut 11 on the side where the bolt 10 is screwed is formed so as to substantially coincide with the upper surface of the lower base plate 6.

  Each truss bar 9 has a quadrangular pyramid shape between two upper strength bars (not shown) extending into the half precast concrete plate and one lower strength bar 9a extending in parallel with the upper strength bars. These lattice muscles 9b are combined, and the vertexes of the quadrangular pyramids of each lattice muscle 9b are configured to face downward.

  In order to prevent displacement of the lower base plate 6 positioned on the concrete placement space 2a of the lower pedestal 2 at the time of concrete placement or the like, the truss 9 of the lower base plate 6 is used for the foundation 1 of the building. It is preferable to fix to the side. Specifically, in the present embodiment, the position fixing rebar 12 whose lower end is fixed to the foundation 1 of the building is used, and the lower end distribution of the truss bar 9 is located near the upper end of the position fixing rebar 12. The position shift is prevented by fixing to the muscle 9a. In the lower base plate 89 made of steel plate in the background art shown in FIG. 9, not only anchor bolts 87 for fixing to the lower frame 2 on the lower surface side but also fixing means for preventing displacement. The stud bolt 91 (in FIG. 9, the position where it is attached is indicated by Δ) is provided, but in the lower base plate 6 of this embodiment, the downward projecting portion of the truss bar 9 is misaligned. Since it can be used as a fixing means for prevention, there is no need to provide a stud bolt or the like as in the prior art, which is advantageous.

  Next, as shown in FIG. 2, the concrete 14 is placed in the concrete placement space 2a of the lower frame 2 surrounded by the mold F1 through the concrete filling hole 13 of the lower base plate 6, and the lower frame 2 is constructed. At the same time, the lower base plate 6 and the lower mount 2 are joined. Specifically, the portion of the lower base plate 6 that protrudes below the truss bar 9 is embedded in the lower frame 2 so that the concrete 14 is hardened and exhibits a fixing action on the concrete 14. And the lower frame 2 are joined together. At this time, as described above, the fixing effect can also be obtained by integrally embedding the lower portion of the cap nut 11 having the flange portion 11a in the lower mount 2. At this point, a gap may still exist between the lower base plate 6 and the upper surface of the lower mount 2 as shown in FIG. In FIG. 2, the concrete 14 is shown in a hardened state.

  In the case of the prior art disclosed in Patent Document 1, it is necessary to use a special member such as an anchor bolt as a fixing portion for fixing between the lower base plate and the lower frame, As described above, the mounting work of the anchor bolt to the lower base plate and the lower frame side is very time-consuming. On the other hand, in the present embodiment, the truss bar 9 that functions as a fixing portion is originally embedded and formed integrally with the lower base plate 6, so that the concrete 14 is simply placed in the construction on site. By simply doing so, the fixing portion can be formed. In addition, the manufacturing method for manufacturing the lower base plate 6 made of a half precast concrete plate with the truss reinforcement 9 integrated in the factory is merely placing the concrete 14 so as to embed and integrate the previously assembled truss reinforcement 9. And very simple. On the other hand, in the prior art, as described above, a plurality of anchor bolts must be screwed into the long nuts of the lower base plate one by one, which is very time-consuming.

  Next, as shown in FIG. 3, the grout 15 is injected through the concrete filling hole 13 of the lower base plate 6 so as to fill a gap between the lower base plate 6 and the upper surface of the lower mount 2. At this time, air existing in the gap is discharged from a plurality of air vent holes 16 formed in the lower base plate 6, and the grout 15 is filled up to the height of the air vent holes 16 and the concrete filling holes 13. After the curing, the lower base plate 6 and the upper surface of the lower pedestal 2 are joined without a gap.

  Next, the seismic isolation device 5 is first placed on the upper surface of the lower base plate 6 as shown in FIG. The seismic isolation device 5 in this embodiment is provided with flange plates 5b and 5c above and below a laminated rubber 5a. By screwing the bolt 10 from above into the cap nut 11 of the lower base plate 6 through a bolt hole (not shown) formed in the lower flange plate 5b of the seismic isolation device 5, the seismic isolation device 5 is It is fixed to the base plate 6.

  Then, the upper base plate 17 that is a base plate for attaching the seismic isolation device is fixed to the upper surface of the upper flange plate 5 c of the seismic isolation device 5. Specifically, the bolt 18 is screwed into the cap nut 20 of the upper base plate 17 from below through a bolt hole (not shown) formed in the upper flange plate 5 c of the seismic isolation device 5, thereby isolating the base. The device 5 is fixed to the upper base plate 17.

  Here, as shown in a plan view of FIG. 6, the upper base plate 17 has a plurality of truss bars 19 and a plurality of bolts 18 for screwing bolts 18 for fixing the upper base plate 17 to the upper surface of the seismic isolation device 5. It consists of a half precast concrete plate integrated with a cap nut 20. In FIG. 6, only the cross section of the cap nut 20 is drawn with a dotted line. The truss bar 19 and the cap nut 20 are provided so that the lower part thereof is integrally embedded in the half precast concrete plate and the upper part thereof protrudes upward. The upper part of the cap nut 20 does not necessarily have to protrude upward, but if it is configured to protrude upward as in this embodiment, it is embedded in the concrete 21 of the upper frame 4 in the same manner as the upper part of the truss bar 9. It is preferable because it is integrated and exhibits a fixing action. Further, a flange-shaped flange 20a is formed at the upper end of the cap nut 20 of the present embodiment, and the formation of such a flange 20a further enhances the fixing action of the upper frame 4 into the concrete 21. This is preferable. The position of the lower end portion, which is the end portion of the cap nut 20 on which the bolt 18 is screwed, is formed so as to substantially coincide with the lower surface of the upper base plate 17.

  Each truss bar 19 is a quadrangular pyramid between two lower end strength bars (not shown) extending in the half precast concrete plate and one upper end strength bar 19a extending in parallel to the lower end strength bars. The lattice muscles 19b are combined, and the vertexes of the quadrangular pyramids of the lattice muscles 19b are directed upward. In short, the configuration of the upper base plate 17 is substantially the same as that of the lower base plate 6 although the vertical direction is reversed, but unlike the lower base plate 6, there are no concrete filling holes or air vent holes.

  Next, as shown in FIG. 4, concrete 21 is placed on the upper base plate 17 to construct the upper base 4, and the upper base plate 17 and the upper base 4 are joined. Specifically, the formwork F2 is erected on the outer peripheral portion of the upper base plate 17, and the concrete 21 is poured from the upper opening of the formwork F2 through reinforcing bar not shown. At this time, the upper protruding portion of the truss bar 9 of the upper base plate 17 is embedded in the upper gantry 4 so that the concrete 21 is hardened and exhibits a fixing action. The upper base plate 17 and the upper gantry 4 Are integrally joined. In FIG. 4, the concrete 21 of the upper gantry 4 has already been hardened. At this time, as described above, the fixing effect can also be obtained by embedding the upper portion of the cap nut 20 having the flange portion 20a in the upper frame 4 integrally.

  Compared to the case of the prior art disclosed in Patent Document 1 in which a special member such as an anchor bolt is used as a fixing portion for fixing between the upper base plate 17 and the upper frame 4, this embodiment is implemented. In the form, the truss bar 19 that functions as a fixing portion is originally formed by being integrally embedded in the upper base plate 17, so that the fixing portion can be simply formed by placing concrete 21 in the construction on site. Can be formed. In addition, the manufacturing method for manufacturing the upper base plate 17 made of a half precast concrete plate with the truss reinforcement 9 integrated in the factory is merely placing the concrete 21 so that the pre-assembled truss reinforcement 9 is embedded and integrated. Thus, it is much simpler than the above-described prior art in which a plurality of anchor bolts must be screwed into the long nuts of the upper base plate one by one.

  In addition, the planar shape of the upper base plate 17 in the present embodiment coincides with the lower surface of the upper frame 4, and therefore completely covers the entire lower surface of the upper frame 4. Therefore, when placing the concrete 21 of the upper frame 4, the upper base plate 17 may be used as it is as the mold of the lower surface portion, and the mold frame and the support supporting it are also specially provided at the periphery of the lower surface portion. There is no need to provide a work.

  By the above process, the mounting structure of the seismic isolation device 5 of this embodiment as shown in FIG. 4 is constructed.

  The upper base plate 17 and the lower base plate 6 (hereinafter simply referred to as the base plates 6 and 17 when referring to both), which are the base plates for mounting the seismic isolation device in the present embodiment, will be described in further detail. High smoothness is required so that the surfaces of the base plates 6 and 17 manufactured in the factory on the side in contact with the seismic isolation device 5 are in close contact with the upper and lower flange plates 5b and 5c. Therefore, it is cast using a formwork such as a steel plate having high smoothness.

  Further, for example, it is necessary to prevent distortion generated in the base plate due to expansion pressure accompanying hardening of the grout 15 or the concrete 21 as much as possible. However, in this embodiment, the half in which the truss bars 9 and 19 are integrally embedded. In the base plates 6 and 17 made of a precast concrete plate, since the truss bars 9 and 19 function as reinforcing bars that increase the strength and bending rigidity of the base plates 6 and 17, it is possible to reliably prevent such distortion. it can. Furthermore, in order to prevent such distortion more reliably, it is also effective to cast and form the concrete portions of the base plates 6 and 17 with high-strength concrete. Further, by providing ribs, for example, ribs extending from one end of the base plates 6 and 17 to the other end along the direction in which the truss bar 9 extends, in the concrete portion of the base plates 6 and 17, the bending rigidity of the base plates 6 and 17 is increased. It is also effective to increase the bending rigidity of the base plates 6 and 17 by introducing prestress.

  The truss bars 9 and 19 which are fixing means for the upper frame 4 and the lower frame 2 (hereinafter simply referred to as the frames 2 and 4 when referring to both) of the base plates 6 and 17 in the present embodiment are particularly provided for the frames 2 and 4. The structures of the lattice bars 9b, 19b and the distribution bars 9a, 19a protruding to the side are hook-like or cage-like with respect to the gantry 2, 4 side, and the placed concrete 14, 21 is the hook Since the base 2 and the four-side concrete 14 and 21 and the truss bars 9 and 19 are engaged with each other by wrapping and hardening to the inside of the cage shape, the prior art disclosed in Patent Document 1 above. Compared with the usual fixing means such as anchor bolts in the above, it exhibits high fixing ability.

  Further, in the upper base plate 84 made of a steel plate according to the background art shown in FIG. 8, an eye plate 92 which is a lifting tool is provided on the upper surface. However, in the base plates 6 and 17 in the present embodiment, since the protruding portions of the truss muscle 9 such as the distribution muscles 9a and 19a and the lattice muscles 9b and 19b can be used as lifting hooks, There is no need to provide a lifting tool such as an eye plate.

  In the case of the steel plate base plates 84 and 89 shown in FIG. 8 and FIG. 9, for example, the thickness is about 25 mm and the manufacturing cost is about 150,000 yen, which is very expensive. The base plate force distribution bars 6 and 17 made of a half precast concrete plate in which the truss bars 9 and 19 and the cap nuts 11 and 20 are integrated can be manufactured at a cost of about 9,000 yen, for example. This is also very advantageous from the aspect.

  As described above, in the mounting structure of the seismic isolation device in the present embodiment, the seismic isolation device 5 installed on the foundation 1 of the building, and the bottom of the seismic isolation device 5 and the building body 3 are constructed. An upper base plate 17 for attaching a seismic isolation device provided between the upper base 4 made of concrete and the upper base plate 17 fixes the upper base plate 17 to the truss bar 19 and the upper surface of the seismic isolation device 5. A half precast concrete plate integrated with a cap nut 20 to which a bolt 18 for screwing is integrated, and the truss bar 19 is integrally embedded in the upper frame 4 to be joined to the upper frame 4 Therefore, it is possible to greatly simplify the construction of the fixing portion for integrally joining the upper base plate 17 to the upper frame 4, which is advantageous. In addition, the truss bar 19 in the upper base plate 17 of the present embodiment exhibits higher fixing performance than the fixing means such as anchor bolts in the prior art, so that the upper base plate 17 is further in relation to the upper frame 4. This is advantageous because it is securely joined. In addition, the upper base plate 17 made of a half precast concrete plate with the truss bars 9 arranged is less distorted than the base plate made of precast concrete without the truss bars in the prior art. This is advantageous because it can maintain high adhesion. Further, the upper base plate 17 made of a half precast concrete plate with the truss bars 9 arranged therein omits lifting equipment for lifting that had to be provided on a base plate made of precast concrete without truss bars in the prior art. This is advantageous. Further, the cap nut 20 provided on the upper base plate 17 of the present embodiment has a portion projecting upward, and a flange portion 20a is formed on the upper projecting portion. Thus, it is advantageous in that the fixing property to the upper frame 4 is exhibited together with the truss bars 9, and the upper base plate 17 can be more reliably joined to the upper frame 4.

  Further, in the mounting structure of the seismic isolation device 5 in the present embodiment, since the planar shape of the upper base plate 17 covers the entire lower surface of the upper frame 4, when placing the concrete 21 of the upper frame 4, Since it is not necessary to install the formwork F and the support work S like the background art shown in FIG. 7 in the lower surface part of the upper mount frame 4, construction work can be simplified and it is advantageous.

  Moreover, in the mounting structure of the seismic isolation device 5 in this embodiment, the seismic isolation device installation provided between the seismic isolation device 5 and the concrete lower frame 2 erected on the foundation 1 of the building. The lower base plate 6 is a half in which a truss bar 9 and a cap nut 11 for screwing a bolt 10 for fixing the seismic isolation device 5 onto the lower base plate 6 are integrated. Since it is made of a precast concrete plate and the truss bar 9 is embedded in the lower frame 2 so as to be joined to the lower frame 2, the lower base plate 6 is integrated with the lower frame 2 in the same manner as the upper base plate 17. This makes it possible to greatly simplify the construction of the fixing portion for the purpose of joining. Further, the truss bars 9 in the lower base plate 6 of the present embodiment exhibit higher fixability than the fixing means such as anchor bolts in the prior art, so that the lower base plate 6 is much more than the lower mount 2. This is advantageous because it is securely joined. In addition, the lower base plate 6 made of a half precast concrete plate with truss bars 9 arranged is less likely to be distorted than the base plate made of precast concrete without the truss bars in the prior art. Advantageously, high adhesion to the device 5 can be maintained. In addition, the lower base plate 6 made of a half precast concrete plate with truss bars 9 is omitted from the conventional lifting base for lifting that had to be provided on a base plate made of precast concrete without truss bars. This is advantageous. Further, the cap nut 11 provided on the lower base plate 6 of the present embodiment has a portion protruding downward, and further, a flange portion 11a is formed in the downward protruding portion, so that it is embedded and integrated in the lower mount 2. Thus, it is advantageous because the fixing property to the lower gantry 2 is exhibited together with the truss bars 9 and the lower base plate 6 can be more reliably joined to the lower gantry 2.

  Moreover, in the construction method of the mounting structure for the seismic isolation device 5 in the present embodiment, the step of fixing the upper base plate 17 to the upper surface of the seismic isolation device 5 and the concrete 21 is placed on the upper portion of the upper base plate 17. Since the upper frame 4 is constructed and the upper base plate 17 and the upper frame 4 are joined, the fixing portion for joining the upper base plate 17 integrally to the upper frame 4 is greatly improved. This can be simplified and is advantageous.

  Further, in the construction method of the mounting structure for the seismic isolation device 5 in the present embodiment, the step of positioning the lower base plate 6 on the concrete placement space 2a of the lower pedestal 2 and the concrete placement of the lower pedestal 2 The concrete has a step of placing the concrete 14 in the installation space 2 a to construct the lower frame 2, joining the lower base plate 6 and the lower frame 2, and fixing the seismic isolation device 5 to the upper surface of the lower base plate 6. Thus, like the upper base plate 17, it is possible to greatly simplify the construction of the fixing portion for integrally joining the lower base plate 6 to the lower gantry 2, which is advantageous.

  Moreover, in the construction method of the mounting structure of the seismic isolation device 5 in this embodiment, the step of positioning and arranging the lower base plate 6 is performed by fixing the truss bar 9 of the lower base plate 6 to the foundation 1 side of the building. Since the step of preventing the positional deviation of the base plate 6 is included, it is not necessary to provide a fixing means for preventing the positional deviation such as the stud bolt 91 in the prior art shown in FIG. This is advantageous because the position shift of the base plate 6 can be prevented.

  Further, in the base plates 6 and 17 for attaching the seismic isolation device in the present embodiment, the seismic isolation device 5 installed on the foundation 1 of the building and the concrete upper gantry 4 constructed at the bottom of the building main body 3. And a bolt 10 for fixing the seismic isolation device 5 to the truss bars 9 and the base plates 6 and 17 for mounting the seismic isolation device. , 18 are integrated with half precast concrete plates integrated with cap nuts 11 and 20, and the truss bar 9 is embedded in the upper frame 4 and the lower frame 2 so as to be integrated with the upper frame 4. In addition, since the upper base plate 17 and the lower base plate 6 are used, the upper base plate 17 and the lower base plate 6 are joined together. It is possible to greatly simplify the construction of the application section, is advantageous. In addition, the truss bars 9 and 19 in the base plate 6 and 17 for attaching the seismic isolation device of the present embodiment exhibit higher fixability than the fixing means such as anchor bolts in the prior art. This is advantageous because the base plates 6 and 17 are more reliably joined to the upper frame 4 and the lower frame 2. In addition, the base plates 6 and 17 for seismic isolation devices made of half precast concrete plates with truss bars 9 and 19 are less distorted than the base plates made of precast concrete without truss bars in the prior art. Adhesiveness with the seismic isolation device 5 can be maintained high, which is advantageous. Further, the base plate for attaching a seismic isolation device made of a half precast concrete plate in which truss bars 9 and 19 are arranged is used for lifting, which had to be provided on a base plate made of precast concrete without truss bars in the prior art. This is advantageous because the lifting tool can be omitted. Further, the cap nuts 11 and 20 provided on the base plates 6 and 17 for attaching the seismic isolation device of the present embodiment have portions protruding upward and downward, and further, flanges 11a and 20a are formed on the protruding portions. Therefore, it is embedded and integrated in the upper frame 4 and the lower frame 2, and exhibits fixing properties to the upper frame 4 and the lower frame 2 together with the truss bars 9, and the base plates 6 and 17 for attaching the seismic isolation device are mounted on the upper frame. 4 and the lower pedestal 2 can be more reliably joined, which is advantageous.

  In addition, since a base base for seismic isolation (not shown) is usually pre-assembled in the concrete placement space 2a when the lower frame 2 is constructed, the base base for base isolation does not interfere with anchor bolts or cap nuts. It had to be assembled with high accuracy. In the present embodiment, the truss muscle 9 becomes a part of the truss muscle 9, so that it is possible to simplify the trouble of installing the base isolation base muscle.

  As a modified example of the above embodiment, a base plate made of a steel plate similar to the prior art may be used for the lower base plate, and the base plate 17 for attaching the seismic isolation device of the above embodiment may be used only for the upper base plate.

It is explanatory drawing of a process which shows suitable one Embodiment of the attachment structure of the seismic isolation apparatus of this invention, and its construction method. It is explanatory drawing which shows the next process of FIG. 1 of the construction method of FIG. It is explanatory drawing which shows the next process of FIG. 2 of the construction method of FIG. It is explanatory drawing which shows the completion state of the construction method of FIG. It is a top view which shows the lower baseplate of the attachment structure of the seismic isolation apparatus of FIG. It is a top view which shows the upper base plate of the attachment structure of the seismic isolation apparatus of FIG. It is explanatory drawing which shows the attachment structure of the conventional seismic isolation apparatus. FIG. 8 is an explanatory plan view showing an upper base plate of the seismic isolation device mounting structure of FIG. 7. FIG. 8 is an explanatory plan view showing a lower base plate of the seismic isolation device mounting structure of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (Building) foundation 2 Lower frame 3 Building body 4 Upper frame 5 Seismic isolation device 6 Lower base plate 9, 19 Truss bar 10, 18 Bolt 11, 20 Cap nut 12 Reinforcing bar 17 Upper base plate

Claims (7)

A seismic isolation device installed on the foundation of the building;
An upper base plate for mounting the seismic isolation device provided between the seismic isolation device and a concrete upper frame constructed at the bottom of the building body;
The upper base plate is made of a half precast concrete plate in which a truss bar and a cap nut for screwing a bolt for fixing the upper base plate to the upper surface of the seismic isolation device are integrated. A structure for mounting a seismic isolation device, wherein the structure is joined to the upper frame by being embedded integrally in the upper frame.   The seismic isolation device mounting structure according to claim 1, wherein the planar shape of the upper base plate covers the entire lower surface of the upper frame. A lower base plate for mounting the seismic isolation device provided between the seismic isolation device and a concrete lower gantry standing on the foundation of the building;
The lower base plate is formed of a half precast concrete plate in which a truss bar and a cap nut for screwing a bolt for fixing the seismic isolation device on the lower base plate are integrated, and the truss bar is connected to the lower base plate. 3. The seismic isolation device mounting structure according to claim 1, wherein the structure is joined to the lower frame by being embedded in the frame integrally. 4. Fixing the upper base plate to the upper surface of the seismic isolation device;
2. The seismic isolation device according to claim 1, further comprising: constructing the upper frame by placing concrete on an upper part of the upper base plate, and joining the upper base plate and the upper frame. How to install the mounting structure. Positioning the lower base plate on the concrete placement space of the lower frame; and
Constructing the lower frame by placing concrete in the concrete placement space of the lower frame, and joining the lower base plate and the lower frame;
The construction method of the mounting structure of the seismic isolation device according to claim 3, further comprising a step of fixing the seismic isolation device to the upper surface of the lower base plate.   The positioning of the lower base plate includes a step of preventing a displacement of the lower base plate by fixing the truss bars of the lower base plate to a foundation side of the building. Method of mounting structure for seismic isolation devices. Seismic isolation system installed between the seismic isolation device installed on the foundation of the building and the concrete upper frame constructed at the bottom of the building body and the concrete lower frame installed on the building foundation. A base plate for mounting the device,
It consists of a half precast concrete plate in which a truss bar and a cap nut for screwing a bolt for fixing the seismic isolation device to the base plate for attaching the seismic isolation device are integrated,
A base plate for attaching a seismic isolation device, wherein the truss bar is integrally embedded in the upper frame or the lower frame and joined to the upper frame or the lower frame.

Images