Precast concrete unit for seismic isolation foundation and method of joining building frame and seismic isolation device

Abstract

To provide a seismic isolation foundation precast concrete unit and a method for joining a building frame and a seismic isolation device, which can reduce installation work to shorten the construction period and secure firm connection to a lower frame or an upper frame.SOLUTION: A seismic isolation foundation precast concrete unit 10 comprises: a seismic isolation device 20 with an upper flange plate 22 and a lower flange plate 21; a seismic isolation lower foundation precast concrete section 30 provided below the seismic isolation device 20 and connected to the lower flange plate 21; and a seismic isolation upper foundation precast concrete section 40 provided above the seismic isolation device 20 and connected to the upper flange plate 22. And on the lower surface 31b of the seismic isolation lower foundation precast concrete section 30, a lower fixing bolt 35 with a nut 37 and a lower connecting steel bar 36 are provided protruding from the lower surface 31b, and on the top surface 41t of the seismic isolation upper foundation precast concrete section 40, an upper fixing bolt 45 with a nut 47 and an upper connecting rebar 46 are provided protruding from the top surface 41t.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a seismic isolation foundation precast concrete unit and a method for joining a building skeleton and a seismic isolation device. [Background technology]

[0002] For example, in mid- to high-rise buildings, seismic isolation devices such as laminated rubber bearings and sliding bearings are sometimes installed. When constructing such buildings, it is common to build a lower structure located below the seismic isolation layer where the seismic isolation devices are installed, and then build an upper structure located above the seismic isolation layer after the seismic isolation devices are installed. However, particularly in cases where concrete is used to form seismic isolation foundations such as footings above and below the seismic isolation device, it is necessary to pour concrete into the appropriate parts of the lower structure and wait for it to harden before installing the seismic isolation device, and then pour concrete into the appropriate parts of the upper structure after installing the seismic isolation device, which tends to lengthen the construction period. In this regard, for example, Patent Document 1 describes a configuration in which a footing located below a column transmits a vertical load from the column to a seismic isolation device, and the vertical load from the seismic isolation device is supported by a foundation located below the seismic isolation device. In such a configuration, the footing has a footing bottom located below the foundation beam and a part directly below the column located between the footing bottom and the column, and the footing bottom and the part directly below the column are made of precast concrete. Patent Document 2 also describes a structure that includes a seismic isolation lower foundation provided on the lower structure, a seismic isolation device installed on the seismic isolation lower foundation, a seismic isolation upper foundation provided on the seismic isolation device, and an upper structure provided on the seismic isolation upper foundation. In this structure, the seismic isolation lower foundation and the seismic isolation upper foundation are made of precast concrete. Furthermore, Patent Document 3 describes a seismic isolation assembly in which a seismic isolation device is installed on a lower rising foundation made of precast concrete, and an upper foundation made of precast concrete is installed on the seismic isolation device, thereby integrating a seismic isolation device, an upper foundation, and a lower rising foundation.

[0003] If the parts of the upper and lower frameworks to which the seismic isolation devices are connected are made of precast concrete as in Patent Documents 1 to 3, it may be possible to shorten the construction period since there is no need to wait for the concrete to harden before joining the seismic isolation devices to the concrete. However, in Patent Documents 1 to 3, the work of joining the parts made of precast concrete to the seismic isolation devices still needs to be done on-site. In addition, if the parts of the upper and lower structures to which the seismic isolation devices are connected are made from precast concrete, these parts must be firmly joined to the upper and lower structures to increase their integrity. There is a demand for a seismic isolation foundation precast concrete unit that can be firmly connected to the lower and upper structures while reducing installation work and shortening construction time, and a method of connecting a building structure to a seismic isolation device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-112788 A [Patent Document 2] Patent No. 7165548 [Patent Document 3] Patent No. 5232106 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem that the present invention aims to solve is to provide a seismic isolation foundation precast concrete unit that can reduce installation work and shorten construction time, and can be firmly connected to the lower and upper structures, and a method of connecting a building structure to a seismic isolation device. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention employs the following means. In other words, the seismic isolation foundation precast concrete unit of the present invention is a seismic isolation foundation precast concrete unit used when constructing a seismic isolation layer of a building, and is characterized in that it comprises a seismic isolation device made of laminated rubber or sliding bearings and equipped with an upper flange plate and a lower flange plate, a seismic isolation lower foundation precast concrete part provided below the seismic isolation device and joined to the lower flange plate, and a seismic isolation upper foundation precast concrete part provided above the seismic isolation device and joined to the upper flange plate, wherein a lower fixing bolt with a nut and a lower connecting bar are provided on the underside of the seismic isolation lower foundation precast concrete part, protruding from the underside, and an upper fixing bolt with a nut and an upper connecting bar are provided on the upper surface of the seismic isolation upper foundation precast concrete part, protruding from the upper surface. According to the above-mentioned configuration, the seismic isolation foundation precast concrete unit includes a seismic isolation lower foundation precast concrete part provided below the seismic isolation device, and a seismic isolation upper foundation precast concrete part provided above the seismic isolation device. Here, in the seismic isolation foundation precast concrete unit, the seismic isolation lower foundation precast concrete part and the seismic isolation upper foundation precast concrete part are joined to the lower flange plate and the upper flange plate of the seismic isolation device, respectively, at the stage of manufacture, and the seismic isolation lower foundation precast concrete part, the seismic isolation upper foundation precast concrete part, and the seismic isolation device are all in a state of being integrated in advance. Therefore, when installing the seismic isolation device in a building, it is only necessary to install the seismic isolation foundation precast concrete unit in a predetermined place, and there is no need to perform the work of joining the seismic isolation device to other members. In addition, there is no need to wait for the concrete to harden when joining the seismic isolation device to the concrete. Therefore, the installation work can be reduced and the construction period can be shortened. In addition, lower fixing bolts and lower connecting rebars are provided protruding from the underside of the seismic isolation lower foundation precast concrete part, and upper fixing bolts and upper connecting rebars are provided protruding from the upper surface of the seismic isolation upper foundation precast concrete part. These bolts and rebars can be used to join the seismic isolation foundation precast concrete unit to the building frame, making the connection between the seismic isolation foundation precast concrete unit and the building frame strong. In this way, it is possible to provide a seismic isolation foundation precast concrete unit that can be firmly connected to the lower and upper structures while reducing installation work and shortening construction time.

[0007] The method of joining a building structure and a seismic isolation device of the present invention is a method of joining a building structure and a seismic isolation device, characterized in that it includes the steps of: constructing a lower structure; installing a seismic isolation foundation precast concrete unit as described above above the lower structure and filling a filler material between the lower structure and the seismic isolation lower foundation precast concrete part of the seismic isolation foundation precast concrete unit; and installing an upper structure above the seismic isolation upper foundation precast concrete part of the seismic isolation foundation precast concrete unit and filling a filler material between the seismic isolation upper foundation precast concrete part and the upper structure. According to this configuration, when installing the seismic isolation device, it is sufficient to install the seismic isolation foundation precast concrete unit as described above above the lower structure. Therefore, at the construction site, it is not necessary to carry out a series of operations such as pouring concrete on-site to construct the seismic isolation lower foundation, installing the seismic isolation device on top of the seismic isolation lower foundation, and then pouring concrete on-site above the seismic isolation device to construct the seismic isolation upper foundation. As a result, it is possible to reduce the installation work and shorten the construction period. Furthermore, a seismic isolation foundation precast concrete unit is installed above the lower structure, and filler is filled between the lower structure and the seismic isolation lower foundation precast concrete part of the seismic isolation foundation precast concrete unit. Furthermore, an upper structure is installed above the seismic isolation upper foundation precast concrete part of the seismic isolation foundation precast concrete unit, and filler is filled between the seismic isolation upper foundation precast concrete unit part and the upper structure. This allows the seismic isolation foundation precast concrete unit to be properly joined to the lower structure and the upper structure with the filler interposed therebetween.

[0008] In one aspect of the present invention, the building skeleton is a steel frame structure, and in the installation process of the seismic isolation foundation precast concrete unit, the lower fixing bolt is fixed to the lower skeleton, and then the filler is filled between the lower skeleton and the seismic isolation lower foundation precast concrete part of the seismic isolation foundation precast concrete unit, and in the installation process of the upper skeleton, the upper fixing bolt is fixed to the upper skeleton, and then the filler is filled between the seismic isolation upper foundation precast concrete part of the seismic isolation foundation precast concrete unit and the upper skeleton. The method includes the steps of filling the concrete structure with concrete, and further joining a lower anchor bar to the tip of the lower connecting bar and pouring concrete to bury the lower anchor bar in the portion of the lower structure located below the seismic isolation foundation precast concrete unit, to form a lower concrete portion; and joining an upper anchor bar to the tip of the upper connecting bar and pouring concrete to bury the upper anchor bar in the portion of the upper structure located above the seismic isolation foundation precast concrete unit, to form an upper concrete portion. According to this configuration, the seismic isolation foundation precast concrete unit can be easily and firmly installed and fixed to the lower structure by fixing the lower fixing bolt to the lower structure, and the seismic isolation foundation precast concrete unit and the upper structure can be easily and firmly fixed to each other by fixing the upper fixing bolt to the upper structure. Also, for example, if the building framework is made of cast-in-place concrete, it is necessary to wait a certain amount of time for the concrete that forms the lower and upper frameworks to harden before placing the seismic isolation foundation precast concrete unit on the lower framework, or after placing the seismic isolation foundation precast concrete unit and before placing the upper framework on top of it. In contrast, if the building framework is made of steel, there is no need to wait for the concrete that forms the lower and upper frameworks to harden before and after placing the seismic isolation foundation precast concrete unit. This makes it possible to shorten the construction period. The lower anchor bars are then joined to the tips of the lower connecting rebars, and concrete is poured to bury the lower anchor bars in the parts of the lower structure that are located below the seismic isolation foundation precast concrete unit, thereby forming the lower concrete part. In this way, the lower anchor bars and the parts of the lower structure that are located below the seismic isolation foundation precast concrete unit are buried in the lower concrete part, so that the seismic isolation foundation precast concrete unit and the lower structure are firmly joined via the lower concrete part. Furthermore, an upper anchor bar is joined to the tip of the upper connecting rebar, and concrete is poured to embed the upper anchor bar and the portion of the upper structure located above the seismic isolation foundation precast concrete unit, thereby forming an upper concrete section. In this way, the upper anchor bar and the portion of the upper structure located above the seismic isolation foundation precast concrete unit are embedded in the upper concrete section, so that the seismic isolation foundation precast concrete unit and the upper structure are firmly joined via the upper concrete section. Effect of the Invention

[0009] According to the present invention, it is possible to provide a seismic isolation foundation precast concrete unit that can reduce installation work and shorten construction time, and can be firmly connected to the lower and upper structures, as well as a method of joining a building structure to a seismic isolation device. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing the configuration of a building skeleton equipped with a seismic isolation foundation precast concrete unit according to an embodiment of the present invention. FIG. [Diagram 2] A vertical cross-sectional view showing a seismic isolation foundation precast concrete unit installed between the lower structure and the upper structure. [Diagram 3] This is a cross-sectional view showing the joints between the columns and beams of the lower and upper structures. [Figure 4] This is an oblique view of the precast concrete part of the seismic isolation lower foundation from diagonally below. [Diagram 5] This is a cross-sectional view of the concrete bodies of the seismic isolation lower foundation precast concrete section and the seismic isolation upper foundation precast concrete section. [Figure 6] An enlarged cross-sectional view showing the joints between the lower fixing bolt, the upper fixing bolt, and the lower body and the upper body. [Figure 7] A diagram showing the process flow of a method for joining a building structure and a seismic isolation device. [Figure 8] A diagram showing the process of constructing the lower body. [Figure 9] FIG. 13 is a diagram showing the installation process of the seismic isolation foundation precast concrete unit. [Figure 10] This is a cross-sectional view showing the state in which the seismic isolation foundation precast concrete unit is placed on the lower structure and the lower end of the lower fixing bolt is inserted into the through hole of the connecting plate during the installation process of the seismic isolation foundation precast concrete unit. [Figure 11] This is a cross-sectional view showing the state after the anti-slip plate has been installed during the installation process of the seismic isolation foundation precast concrete unit. [Figure 12] A cross-sectional view showing the installation process of the upper body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, with reference to the attached drawings, an embodiment for carrying out the seismic isolation foundation precast concrete unit and the method for joining a building skeleton and a seismic isolation device according to the present invention will be described based on the drawings. A diagram showing the configuration of a building skeleton equipped with a seismic isolation foundation precast concrete unit according to an embodiment of the present invention is shown in Fig. 1. Fig. 2 is a vertical cross-sectional view showing the seismic isolation foundation precast concrete unit provided between a lower skeleton and an upper skeleton. As shown in Fig. 1 and Fig. 2, for example, in a mid- to high-rise building 1, a seismic isolation layer 2 equipped with seismic isolation base precast concrete units 10 is provided on an intermediate floor above ground. The seismic isolation base precast concrete units 10 are incorporated into a building skeleton 3 that constitutes the ground floor of the building 1. The building skeleton 3 is a steel frame structure, and has a lower skeleton 4 that constitutes the skeleton below the seismic isolation layer 2, and an upper skeleton 5 that constitutes the skeleton above the seismic isolation layer 2. The seismic isolation base precast concrete units 10 are provided between the lower skeleton 4 and the upper skeleton 5. In this manner, the building 1 of this embodiment has a mid-floor seismic isolation structure in which the seismic isolation layer 2 is provided on the intermediate floor above ground level.

[0012] The lower structure 4 has a plurality of columns 4C spaced apart in the horizontal direction, and beams 4B provided between adjacent columns 4C on each floor. In this embodiment, the lower structure 4 has braces 4D between the upper and lower beams 4B. Fig. 3 is a cross-sectional view showing the joint between the column and the beam of the lower skeleton and the upper skeleton described later. More specifically, Fig. 3 is a cross-sectional view of the joint between the column and the beam of the lower skeleton in part II of Fig. 2, and is also a cross-sectional view of the joint between the column and the beam of the upper skeleton in part II-II of Fig. 2. In the lower structure 4, each column 4C is a steel pipe column with a rectangular cross section. For example, a total of four beams 4B are joined in a cross shape to the upper end of each column 4C from all four sides. Each beam 4B is made of H-shaped steel having flanges 4f, 4g spaced apart from each other above and below, and a web 4h connecting the upper and lower flanges 4f, 4g. A diaphragm 4d is joined to the upper end surface of each column 4C, and the end of the upper flange 4f of each beam 4B is joined to this diaphragm 4d. The web 4h of each beam 4B is joined to the side of the column 4C. The lower flange 4g of each beam 4B is joined to a diaphragm 4e provided at the position of the lower flange 4g.

[0013] Between the beams 4B adjacent to each other in the circumferential direction of the column 4C, a connection plate 4p is provided on the outside of the corner of the column 4C. The connection plate 4p is L-shaped in a plan view and is joined to the upper flanges 4f of the adjacent beams 4B. For example, two rib plates 4q are provided on the lower side of the connection plate 4p. Each rib plate 4q is joined to the outer surface of the column 4C and extends obliquely from the column 4C between the adjacent beams 4B in a plan view. The upper end of each rib plate 4q is welded to the connection plate 4p.

[0014] 1 and 2, the upper structure 5 has a plurality of columns 5C spaced apart in the horizontal direction, and beams 5B provided between adjacent columns 5C on each floor. Each column 5C is provided at a position overlapping with a column 4C of the lower structure 4 in a plan view. In the upper structure 5, each column 5C is a steel pipe column with a rectangular cross section. For example, a total of four beams 5B are joined in a cross shape to the lower end of each column 5C from all four sides. Each beam 5B is made of H-shaped steel having flanges 5f, 5g spaced apart from each other above and below, and a web 5h connecting the upper and lower flanges 5f, 5g. A diaphragm 5d is joined to the lower end surface of each column 5C, and the end of the lower flange 5g of each beam 5B is joined to this diaphragm 5d. The web 5h of each beam 5B is joined to the side of the column 5C. The upper flange 5f of each beam 5B is joined to a diaphragm 5e provided at the position of the upper flange 5f.

[0015] Between the beams 5B adjacent to each other in the circumferential direction of the column 5C, a connection plate 5p is provided on the outside of the corner of the column 5C. The connection plate 5p is L-shaped in a plan view and is joined to the lower flanges 5g of the adjacent beams 5B. For example, two rib plates 5q are provided on the upper side of the connection plate 5p. Each rib plate 5q is joined to the outer surface of the column 5C and extends obliquely from the column 5C between the adjacent beams 5B in a plan view. The lower end of each rib plate 5q is welded to the connection plate 5p.

[0016] As shown in FIG. 2 , the seismic isolation foundation precast concrete unit 10 includes a seismic isolation device 20 , a seismic isolation lower foundation precast concrete section 30 , and a seismic isolation upper foundation precast concrete section 40 . The seismic isolation device 20 is made of laminated rubber or a sliding bearing. In this embodiment, the seismic isolation device 20 is made of, for example, laminated rubber. The seismic isolation device 20 includes a lower flange plate 21, an upper flange plate 22, and a laminated rubber portion 23. The lower flange plate 21 and the upper flange plate 22 are arranged at an interval in the vertical direction. The lower flange plate 21 and the upper flange plate 22 are each made of a steel plate arranged along a horizontal plane. In this embodiment, the lower flange plate 21 and the upper flange plate 22 each have a rectangular shape in a plan view. The laminated rubber portion 23 is arranged between the lower flange plate 21 and the upper flange plate 22. The laminated rubber portion 23 is formed by stacking a steel plate 23a and a viscoelastic body 23b formed of a rubber-based material or the like in multiple layers in the vertical direction.

[0017] The seismic isolation lower foundation precast concrete part 30 is provided below the seismic isolation device 20. The seismic isolation lower foundation precast concrete part 30 includes a concrete body 31, a lower base plate 32, lower anchor bolts 33, lower fixing bolts 35, and a lower connecting reinforcing bar 36. FIG. 4 is a perspective view of the precast concrete part of the seismic isolation lower foundation, viewed obliquely from below. Fig. 5 is a plan cross-sectional view of the concrete bodies of the seismic isolation lower foundation precast concrete part and the seismic isolation upper foundation precast concrete part described later. More specifically, Fig. 5 is a cross-sectional view of the seismic isolation lower foundation precast concrete part in the III-III part of Fig. 2, and is also a cross-sectional view of the seismic isolation upper foundation precast concrete part in the IV-IV part of Fig. 5. The concrete body 31 is made of precast concrete molded into a predetermined shape. The concrete body 31 has an upper surface 31t, a lower surface 31b, and an outer surface 31s. The concrete body 31 is, for example, rectangular in plan view. The upper surface 31t faces upward. The lower surface 31b is formed a predetermined distance below the upper surface 31t and faces downward. The outer surface 31s is provided so as to continue from each of the upper surface 31t and the lower surface 31b and connect them vertically. At the four corners of the lower surface 31b, recesses 31d are formed that are recessed upward from the lower surface 31b. Each recess 31d is L-shaped when viewed from below, and extends along the outer surfaces 31s located on both sides of the corner of the concrete body 31.

[0018] 2, the lower base plate 32 is provided along the upper surface 31t of the concrete body 31. In this embodiment, the lower base plate 32 is embedded in the concrete body 31, and the upper surface 32t is provided at the same height as the upper surface 31t of the concrete body 31. The lower base plate 32 is made of a metal plate, and is in contact with the lower flange plate 21 of the seismic isolation device 20 from below. A plurality of lower anchor bolts 33 are provided on the outer side of the laminated rubber part 23. A plurality of lower anchor bolts 33 are provided around the laminated rubber part 23 at intervals. Each lower anchor bolt 33 extends in the vertical direction and is embedded in the concrete body 31. A fixing nut 33a is provided at the lower end of the lower anchor bolt 33, and the lower anchor bolt 33 is fixed to the concrete body 31. The upper end of the lower anchor bolt 33 penetrates the lower base plate 32 and protrudes upward from the upper surface 31t of the concrete body 31. The upper end of the lower anchor bolt 33 penetrates the lower flange plate 21 of the seismic isolation device 20, and the lower flange plate 21 of the seismic isolation device 20 is joined to the seismic isolation lower foundation precast concrete part 30 by the fixing nut 33b. In this manner, the seismic isolation lower foundation precast concrete part 30 and the seismic isolation device 20 are joined.

[0019] The lower fixing bolts 35 are provided at the four corners of the concrete body 31, on the inside of the recesses 31d. The lower fixing bolts 35 are provided to extend in the vertical direction and are embedded in the concrete body 31. The upper ends of the lower fixing bolts 35 are joined to the lower surface of the lower base plate 32 by welding or the like. The lower ends of the lower fixing bolts 35 protrude downward from the lower surface 31b of the concrete body 31. The nuts 37 are attached to the lower ends of the lower fixing bolts 35. That is, the lower fixing bolts 35 are lower fixing bolts 35 with nuts 37. In this embodiment, a plate washer 37z is welded to the lower side of the nuts 37, i.e., the side of the nuts 37 opposite the concrete body 31 (see FIG. 6). In FIG. 4, the plate washer 37z is not shown in order to simplify the drawing. A plurality of lower connection rebars 36 are embedded in the concrete body 31. The lower connection rebars 36 have vertical extension parts 36a extending in the vertical direction. The lower ends of the vertical extension parts 36a protrude downward from the lower surface 31b of the concrete body 31, including the recess 31d. The lower ends of the vertical extension parts 36a of the lower connection rebars 36 are positioned below the lower surface 31b of the concrete body 31. In this embodiment, the lower ends of the cage reinforcement bars arranged inside the concrete body 31 protrude downward from the lower surface 31b of the concrete body 31, thereby forming lower connection reinforcement bars .

[0020] 2, the seismic isolation lower foundation precast concrete section 30 is disposed on a joint 4J between a column 4C and a beam 4B of the lower structure 4. At the joint 4J, mortar 80 having a predetermined thickness is provided on a diaphragm 4d provided on the upper end surface of the column 4C located at the intersection of the four beams 4B. As a result, the lower surface 31b of the concrete body 31 of the seismic isolation lower foundation precast concrete section 30 is provided on the column 4C via the mortar 80. Furthermore, filler 81 made of, for example, non-shrink mortar is filled in the portion where mortar 80 is not provided between the diaphragm 4d provided on the upper end surface of the column 4C, the upper flange 4f of the beam 4B extending in all directions from the joint 4J, and the lower surface 31b of the concrete body 31 located directly above the flange 4f. In this way, the lower framework 4 and the concrete body 31 of the seismic isolation foundation precast concrete unit 10 are positioned with the filler 81 in between.

[0021] Fig. 6 is an enlarged cross-sectional view showing the joint between the lower fixing bolt and the lower body. Fig. 6 is also an enlarged cross-sectional view showing the joint between the upper fixing bolt and the upper body, which will be described later. In this case, Fig. 6 is drawn upside down. A through hole 4s is formed in the connection plate 4p provided between the four beams 4B joined to the column 4C. The lower end of the lower fixing bolt 35 is inserted into this through hole 4s. The connection plate 4p is fixed in a state where it is sandwiched between the nut 37 previously attached to the lower fixing bolt 35 and the fastening nut 82 screwed onto the lower fixing bolt 35 from the lower side of the connection plate 4p. In this embodiment, a plate washer 82z is welded to the upper side of the nut 82. As a result, the connection plate 4p is actually sandwiched between the plate washer 37z welded to the nut 37 and the plate washer 82z welded to the nut 82.

[0022] 2, the lower connection rebar 36 protruding downward from the seismic isolation lower foundation precast concrete part 30 is embedded and joined to a lower concrete part 60 provided by pouring concrete in situ below the seismic isolation lower foundation precast concrete part 30. The lower concrete part 60 includes cage reinforcement 61, lower anchor reinforcement 63, and a cast-in-situ concrete part 65. The cage reinforcement 61 and the lower anchor reinforcement 63 are embedded in the cast-in-place concrete portion 65. The cage reinforcement 61 and the lower anchor reinforcement 63 extend in the vertical direction, and their upper ends are joined to the tip (lower end) of the lower connection rebar 36 via a mechanical joint 88 or the like.

[0023] The cast-in-place concrete portion 65 is provided at the upper end of the column 4C so as to cover the joint 4J between the upper end of the column 4C and the beams 4B on all four sides. The cast-in-place concrete portion 65 has a size that overlaps with the concrete body 31 of the seismic isolation lower foundation precast concrete portion 30 when viewed in plan, that is, the same size as the concrete body 31. The cast-in-place concrete portion 65 is also filled in the recesses 31d formed at the four corners of the concrete body 31. In this embodiment, the lower surface of the cast-in-place concrete portion 65 is located lower than the lower flanges 4g of the beams 4B on all four sides. As a result, the portion of the lower body 4 located below the seismic isolation foundation precast concrete unit 10, including the joint 4J between the upper end of the column 4C and the beams 4B on all four sides, is embedded in the cast-in-place concrete portion 65 together with the lower end of the lower connection reinforcing bar 36 protruding from the concrete body 31 and the lower anchor reinforcing bar 63 and the cage reinforcing bar 61 connected to the lower connection reinforcing bar 36. In this way, the seismic isolation lower foundation precast concrete section 30 is joined to the lower concrete section 60 in which the joint 4J between the column 4C and beam 4B of the lower structure 4 is embedded via the lower fixing bolts 35 protruding downward and the lower connecting steel bars 36, so that the seismic isolation lower foundation precast concrete section 30 and the lower structure 4 are firmly joined and integrated.

[0024] The seismic isolation upper foundation precast concrete part 40 is provided above the seismic isolation device 20. The seismic isolation upper foundation precast concrete part 40 includes a concrete body 41, an upper base plate 42, upper anchor bolts 43, upper fixing bolts 45, and upper connecting reinforcing bars 46. The concrete body 41 is made of precast concrete molded into a predetermined shape. The concrete body 41 has a lower surface 41b, an upper surface 41t, and an outer surface 41s. The concrete body 41 is, for example, rectangular in plan view. The lower surface 41b faces downward. The upper surface 41t is formed a predetermined distance above the lower surface 41b and faces upward. The outer surface 41s is provided so as to continue from each of the upper surface 41t and the lower surface 41b and connect them vertically. Although not specifically shown in each drawing, recesses may be formed at the four corners of the upper surface 41t so as to be recessed downward from the upper surface 41t, as in the case of the seismic isolation lower foundation precast concrete part 30.

[0025] The upper base plate 42 is provided along the lower surface 41b of the concrete body 41. In this embodiment, the upper base plate 42 is embedded in the concrete body 41, and the lower surface 42b is provided at the same height as the lower surface 41b of the concrete body 41. The upper base plate 42 is made of a metal plate, and is in contact with the upper flange plate 22 of the seismic isolation device 20 from above. A plurality of upper anchor bolts 43 are provided on the outer side of the laminated rubber part 23. A plurality of upper anchor bolts 43 are provided around the laminated rubber part 23 at intervals. Each upper anchor bolt 43 extends in the vertical direction and is embedded in the concrete body 41. A fixing nut 43a is provided at the upper end of the upper anchor bolt 43, and the upper anchor bolt 43 is fixed to the concrete body 41. The lower end of the upper anchor bolt 43 penetrates the upper base plate 42 and protrudes downward from the lower surface 41b of the concrete body 41. The lower end of the upper anchor bolt 43 penetrates the upper flange plate 22 of the seismic isolation device 20, and the upper flange plate 22 of the seismic isolation device 20 is joined to the seismic isolation upper foundation precast concrete part 40 by the fixing nut 43b. In this manner, the seismic isolation upper foundation precast concrete part 40 and the seismic isolation device 20 are joined.

[0026] The upper fixing bolt 45 is provided to extend in the vertical direction and is embedded in the concrete body 41. The lower end of the upper fixing bolt 45 is joined to the upper surface of the upper base plate 42 by welding or the like. The upper end of the upper fixing bolt 45 protrudes upward from the upper surface 41t of the concrete body 41. A nut 47 is attached to the upper end of the upper fixing bolt 45. In other words, the upper fixing bolt 45 is an upper fixing bolt 45 with a nut 47. In this embodiment, a plate washer 47z is welded to the side of the nut 47 opposite the concrete body 41 (see FIG. 6). A plurality of upper connection rebars 46 are embedded in the concrete body 41. The upper connection rebars 46 have vertical extension portions 46a extending in the vertical direction. The upper ends of the vertical extension portions 46a protrude upward from the upper surface 41t of the concrete body 41. In this embodiment, the upper ends of the cage reinforcement bars arranged inside the concrete body 41 protrude upward from the upper surface 41b of the concrete body 41, thereby forming upper connection reinforcement bars 46.

[0027] A joint 5J between the column 5C and the beam 5B of the upper structure 5 is provided on the seismic isolation upper foundation precast concrete part 40. In a plan view, mortar 90 having a predetermined thickness is provided between the upper surface 41t of the concrete body 41 of the seismic isolation upper foundation precast concrete part 40 and the diaphragm 5d provided on the lower end surface of the column 5C located at the portion where the beams 5B on all four sides intersect at the joint 5J. As a result, the joint 5J of the upper structure 5 is provided on the seismic isolation upper foundation precast concrete part 40 via the mortar 90. Furthermore, filler 91 made of, for example, non-shrink mortar is filled in the portion where mortar 90 is not provided between the diaphragm 5d provided on the lower end surface of the column 5C, the lower flange 5g of the beam 5B extending in all directions from the joint 5J, and the upper surface 41t of the concrete body 41 located directly below the flange 5g. In this way, the upper structure 5 and the concrete body 41 of the seismic isolation foundation precast concrete unit 10 are positioned with the filler 91 in between.

[0028] As shown in FIG. 6, a through hole 5s is formed in the connection plate 5p provided between the four beams 5B joined to the column 5C. The upper end of the upper fixing bolt 45 is inserted into this through hole 5s. The connection plate 5p is fixed in a sandwiched state between the nut 47 previously attached to the upper fixing bolt 45 and the fastening nut 92 screwed to the upper fixing bolt 45 from the opposite side of the connection plate 5p. In this embodiment, a plate washer 92z is welded to the side of the nut 92 facing the connection plate 5p. As a result, the connection plate 5p is actually sandwiched between the plate washer 47z welded to the nut 47 and the plate washer 92z welded to the nut 92.

[0029] 2, the upper connection rebar 46 protruding upward from the seismic isolation upper foundation precast concrete part 40 is embedded in and joined to an upper concrete part 70 that is provided by pouring concrete in situ above the seismic isolation upper foundation precast concrete part 40. The upper concrete part 70 includes cage reinforcement 71, upper anchor reinforcement 73, and a cast-in-situ concrete part 75. The cage reinforcement 71 and the upper anchor reinforcement 73 are embedded in the cast-in-place concrete portion 75. The cage reinforcement 71 and the upper anchor reinforcement 73 extend in the vertical direction, and their lower ends are joined to the tip (upper end) of the upper connection rebar 46 via a mechanical joint 98 or the like.

[0030] The cast-in-place concrete portion 75 is provided at the lower end of the column 5C so as to cover the joint 5J between the lower end of the column 5C and the beams 5B on all four sides. The cast-in-place concrete portion 75 has a size that overlaps with the concrete body 41 of the seismic isolation upper foundation precast concrete portion 40 when viewed in plan, that is, the same size as the concrete body 41. In this embodiment, the upper surface of the cast-in-place concrete portion 75 is located above the upper flange 5f of the beams 5B on all four sides. As a result, the portion of the upper body 5 located above the seismic isolation foundation precast concrete unit 10, including the joint 5J between the lower end of the column 5C and the beams 5B on all four sides, is embedded in the cast-in-place concrete portion 75 together with the upper end of the upper connection reinforcing bar 46 protruding from the concrete body 41 and the upper anchor reinforcing bar 73 and the cage reinforcing bar 71 connected to the upper connection reinforcing bar 46. In this way, the seismic isolation upper foundation precast concrete section 40 is joined to the upper concrete section 70 in which the joint 5J between the column 5C and beam 5B of the upper structure 5 is embedded via the upper fixing bolts 45 protruding upward and the upper connecting steel bars 46, thereby firmly joining and integrating the seismic isolation upper foundation precast concrete section 40 and the upper structure 5.

[0031] Next, a method for joining the building skeleton and the seismic isolation device according to this embodiment will be described. FIG. 7 is a diagram showing the process flow of a method for joining a building skeleton and a seismic isolation device. As shown in Figure 7, the method of joining a building structure and a seismic isolation device includes a process S1 of constructing a lower structure 4, a process S2 of installing a seismic isolation foundation precast concrete unit 10, a process S3 of installing an upper structure 5, a process S4 of forming a lower concrete section 60, and a process S5 of forming an upper concrete section 70. FIG. 8 is a diagram showing the process of constructing the lower body. As shown in FIG. 8, in a step S1 of constructing the lower skeleton 4, the lower skeleton 4 is constructed up to the floor immediately below the seismic isolation layer 2. In the installation process S2 of the seismic isolation foundation precast concrete unit 10, the seismic isolation foundation precast concrete unit 10 is installed above the lower structure 4. To do this, first, mortar 80 having a predetermined thickness is attached to the diaphragm 4d provided on the upper end surface of the column 4C at the joint 4J between the column 4C and the beam 4B of the lower structure 4. In addition, liner plates 83 for level adjustment are attached to positions outside the mortar 80 on the upper flanges 4f of the beams 4B on all four sides.

[0032] FIG. 9 is a diagram showing the installation process of the seismic isolation foundation precast concrete unit. 9, the seismic isolation foundation precast concrete unit 10 is placed on the mortar 80 and the liner plate 83. Here, the seismic isolation foundation precast concrete unit 10 is manufactured in advance in a state where the seismic isolation device 20, the seismic isolation lower foundation precast concrete part 30, and the seismic isolation upper foundation precast concrete part 40 are integrally joined together. The seismic isolation lower foundation precast concrete part 30 and the seismic isolation upper foundation precast concrete part 40 are connected via a connecting metal fitting (not shown) that is provided so as to span between the outer surface 31s (insert not shown) of the concrete body 31 of the seismic isolation lower foundation precast concrete part 30 and the outer surface 41s (insert not shown) of the concrete body 41 of the seismic isolation upper foundation precast concrete part 40. In this state, the seismic isolation foundation precast concrete unit 10 is lifted up to above the lower structure 4. In this way, if the seismic isolation lower foundation precast concrete part 30 and the seismic isolation upper foundation precast concrete part 40 are lifted while connected with the connecting metal fittings, the load caused by the lifting is borne by the connecting metal fittings, and is prevented from being directly applied to the seismic isolation device 20. After the seismic isolation foundation precast concrete unit 10 is installed above the lower structure 4, the connecting metal fittings are removed at an appropriate time.

[0033] Figure 10 is a cross-sectional view showing the state in which the seismic isolation foundation precast concrete unit is placed on the lower structure and the lower end of the lower fixing bolt is inserted into the through hole of the connecting plate during the installation process of the seismic isolation foundation precast concrete unit. As shown in FIG. 10, when placing the seismic isolation foundation precast concrete unit 10 on the mortar 80 and the liner plate 83, the lower end of the lower fixing bolt 35 is inserted into the through hole 4s formed in the connection plate 4p. After placing the seismic isolation foundation precast concrete unit 10 on the mortar 80 and the liner plate 83, the horizontal level of the seismic isolation foundation precast concrete unit 10 is adjusted as necessary using a height adjustment device 85 such as a construction base. When the horizontal level is finely adjusted using the height adjustment device 85, the distance between the flange 4f and the lower surface 31b of the seismic isolation lower foundation precast concrete part 30 changes compared to before the adjustment. For this reason, a liner plate 83 having a thickness according to this distance is inserted again between the flange 4f and the lower surface 31b of the seismic isolation lower foundation precast concrete part 30 to determine the position of the seismic isolation lower foundation precast concrete part 30 in the height direction. Thereafter, as the mortar 80 hardens, the seismic isolation foundation precast concrete unit 10 is supported on the lower structure 4.

[0034] 6, the nuts 37 previously attached to the lower fixing bolts 35 and the fastening nuts 82 screwed onto the lower fixing bolts 35 from the underside of the connection plate 4p are tightened to sandwich the connection plate 4p between the nuts 37 and the fastening nuts 82. In this manner, the seismic isolation lower foundation precast concrete part 30 of the seismic isolation foundation precast concrete unit 10 is fixed to the lower structure 4. FIG. 11 is a cross-sectional view showing the state in which the shear stop plate has been attached during the process of installing the seismic isolation foundation precast concrete unit. 11, a stopper plate 84 is welded onto the upper flange 4f of each of the beams 4B extending in all four directions from the joint 4J of the lower structure 4. The stopper plate 84 is provided so as to fit along the outer surface 31s of the concrete body 31 of the seismic isolation lower foundation precast concrete part 30. The stopper plate 84 prevents the concrete body 31 from shifting in the horizontal direction. Thereafter, if height adjustment devices 85 (see FIG. 10) were used, the height adjustment devices 85 are removed, and then filler 81 is filled between the lower structure 4 and the seismic isolation lower foundation precast concrete part 30 of the seismic isolation foundation precast concrete unit 10. As the filler 81 hardens, the seismic isolation lower foundation precast concrete part 30 is supported by the lower structure 4.

[0035] In the step S3 of installing the upper structure 5, the upper structure 5 is installed above the seismic isolation upper foundation precast concrete part 40 of the seismic isolation foundation precast concrete unit 10 installed in the step S2. To this end, mortar 90 having a predetermined thickness is first attached to the upper surface 41t of the concrete body 41 of the seismic isolation upper foundation precast concrete part 40 at a position that overlaps with the column 5C when viewed from above, that is, at a portion corresponding to the diaphragm 5d provided on the lower end surface of the column 5C, which is located in the central portion where the beams 5B on all four sides intersect. When installing the upper structure 5, liner plates, construction bases, anti-slip plates, etc. may be used as appropriate, just as when installing the seismic isolation foundation precast concrete unit 10 on the lower structure 4.

[0036] FIG. 12 is a cross-sectional view showing the process of installing the upper body. Thereafter, as shown in FIG. 12, the columns 5C and beams 5B constituting the upper structure 5 are erected on the mortar 90. At this time, as shown in FIG. 6, the upper ends of the upper fixing bolts 45 are inserted from below into the through holes 5s formed in the connection plate 5p. Then, the nuts 47 previously attached to the upper fixing bolts 45 and the fastening nuts 92 screwed onto the upper fixing bolts 45 from above the connection plate 5p are fastened, and the connection plate 5p is sandwiched between the nuts 47 and the fastening nuts 92. In this manner, the upper structure 5 is fixed to the seismic isolation upper foundation precast concrete part 40. Thereafter, filler 91 is filled between the seismic isolation upper foundation precast concrete portion 40 and the upper structure 5. As the filler 91 hardens, the upper structure 5 is supported by the seismic isolation upper foundation precast concrete portion 40.

[0037] In step S4 of forming the lower concrete part 60, as shown in Fig. 2, the lower concrete part 60 is formed below the seismic isolation foundation precast concrete unit 10 installed on the lower body 4 in step S2. To this end, first, basket bars 61 are arranged below the seismic isolation lower foundation precast concrete part 30, and the basket bars 61 and lower anchor bars 63 are joined to the tips of the lower connecting rebars 36 protruding downward from the seismic isolation lower foundation precast concrete part 30 by mechanical joints 88 or the like. Furthermore, a formwork (not shown) is assembled in the portion of the lower concrete portion 60 where the cast-in-place concrete portion 65 will be formed. After that, concrete is poured into the formwork so as to bury the portion of the lower body 4 located below the seismic isolation foundation precast concrete unit 10, the cage reinforcement 61, and the lower anchor reinforcement 63. As this concrete hardens, the cast-in-place concrete portion 65 is formed. The formwork is then dismantled and removed. In this way, the lower concrete portion 60 is provided. This step S4 may be performed after the completion of step S3, or after the completion of step S2, it can be performed in parallel with step S3.

[0038] In step S5 of forming the upper concrete part 70, the upper concrete part 70 is formed at the joints 5J between the columns 5C of the upper structure 5 erected in step S3 and the four beams 5B. To this end, cage reinforcement 71 is first arranged, and the cage reinforcement 71 and upper anchor reinforcement 73 are joined to the tips of the upper connecting rebars 46 protruding upward from the seismic isolation upper foundation precast concrete part 40 with mechanical joints 98 or the like. Furthermore, a formwork (not shown) is assembled in the portion of the upper concrete portion 70 where the cast-in-place concrete portion 75 will be formed. After that, concrete is poured into the formwork so as to bury the portion of the upper body 5 located above the seismic isolation foundation precast concrete units 10, the cage reinforcement 71, and the upper anchor reinforcement 73. As this concrete hardens, the cast-in-place concrete portion 75 is formed. The formwork is then dismantled and removed. In this way, the upper concrete portion 70 is provided. After this, the upper structure 5 is constructed in sequence on the upper side of the seismic isolation layer 2 constructed in this manner up to the top floor.

[0039] The seismic isolation foundation precast concrete unit 10 as described above is a seismic isolation foundation precast concrete unit 10 used when constructing the seismic isolation layer 2 of a building 1, and comprises a seismic isolation device 20 made of laminated rubber or a sliding bearing, and equipped with an upper flange plate 22 and a lower flange plate 21, a seismic isolation lower foundation precast concrete part 30 provided below the seismic isolation device 20 and joined to the lower flange plate 21, and a seismic isolation upper foundation precast concrete part 40 provided above the seismic isolation device 20 and joined to the upper flange plate 22, and a lower fixing bolt 35 with nut 37 and a lower connecting steel bar 36 are provided on the underside 31b of the seismic isolation lower foundation precast concrete part 30, protruding from the underside 31b, and an upper fixing bolt 45 with nut 47 and an upper connecting steel bar 46 are provided on the upper side 41t of the seismic isolation upper foundation precast concrete part 40, protruding from the upper side 41t. According to the above-mentioned configuration, the seismic isolation foundation precast concrete unit 10 includes the seismic isolation lower foundation precast concrete part 30 provided below the seismic isolation device 20 and the seismic isolation upper foundation precast concrete part 40 provided above the seismic isolation device 20. Here, in the seismic isolation foundation precast concrete unit 10, the seismic isolation lower foundation precast concrete part 30 and the seismic isolation upper foundation precast concrete part 40 are joined to the lower flange plate 21 and the upper flange plate 22 of the seismic isolation device 20, respectively, at the stage of manufacture, and the seismic isolation lower foundation precast concrete part 30, the seismic isolation upper foundation precast concrete part 40, and the seismic isolation device 20 are all in a state of being integrated in advance. Therefore, when installing the seismic isolation device 20 in the building 1, it is only necessary to install the seismic isolation foundation precast concrete unit 10 in a predetermined place, and there is no need to perform the work of joining the seismic isolation device 20 to other members. In addition, there is no need to wait for the concrete to harden when joining the seismic isolation device 20 to the concrete. Therefore, the installation work can be reduced and the construction period can be shortened. Furthermore, lower fixing bolts 35 and lower connecting rebars 36 are provided protruding from the underside 31b of the seismic isolation lower foundation precast concrete part 30, and upper fixing bolts 45 and upper connecting rebars 46 are provided protruding from the upper side 41t of the seismic isolation upper foundation precast concrete part 40. Using these bolts and rebars, the seismic isolation foundation precast concrete unit 10 can be joined to the building skeleton 3, making the joint between the seismic isolation foundation precast concrete unit 10 and the building skeleton 3 strong. In this way, it is possible to provide a seismic isolation foundation precast concrete unit 10 that can be firmly connected to the lower structure 4 and upper structure 5 while reducing installation work and shortening construction time.

[0040] In addition, the method of joining the building structure 3 and seismic isolation device 20 as described above includes a process S1 of constructing the lower structure 4, a process S2 of installing the seismic isolation foundation precast concrete unit 10, in which the seismic isolation foundation precast concrete unit 10 as described above is installed above the lower structure 4 and filler material 81 is filled between the lower structure 4 and the seismic isolation lower foundation precast concrete portion 30 of the seismic isolation foundation precast concrete unit 10, and a process S3 of installing the upper structure 5, in which the upper structure 5 is installed above the seismic isolation upper foundation precast concrete portion 40 of the seismic isolation foundation precast concrete unit 10 and filler material 91 is filled between the seismic isolation upper foundation precast concrete portion 40 and the upper structure 5. With this configuration, when installing the seismic isolation device 20, it is sufficient to install the seismic isolation foundation precast concrete unit 10 above the lower structure 4. Therefore, at the construction site, it is not necessary to carry out a series of operations, such as pouring concrete on-site to construct the seismic isolation lower foundation, installing the seismic isolation device on top of the seismic isolation lower foundation, and further pouring concrete on-site above the seismic isolation device 20 to construct the seismic isolation upper foundation. As a result, it is possible to reduce the installation work and shorten the construction period. Furthermore, the seismic isolation foundation precast concrete unit 10 is installed above the lower structure 4, and filler 81 is filled between the lower structure 4 and the seismic isolation lower foundation precast concrete part 30 of the seismic isolation foundation precast concrete unit 10. Furthermore, the upper structure 5 is installed above the seismic isolation upper foundation precast concrete part 40 of the seismic isolation foundation precast concrete unit 10, and filler 91 is filled between the seismic isolation upper foundation precast concrete unit part 40 and the upper structure 5. This allows the seismic isolation foundation precast concrete unit 10 to be appropriately joined to the lower structure 4 and the upper structure 5 with the fillers 81, 91 interposed therebetween.

[0041] In addition, in the method of joining the building skeleton 3 and the seismic isolation device 20, the building skeleton 3 is a steel frame structure, and in the installation process S2 of the seismic isolation foundation precast concrete unit 10, after the lower fixing bolts 35 are fixed to the lower skeleton 4, a filler 81 is filled between the lower skeleton 4 and the seismic isolation lower foundation precast concrete part 30 of the seismic isolation foundation precast concrete unit 10, and in the installation process S3 of the upper skeleton 5, after the upper fixing bolts 45 are fixed to the upper skeleton 5, a filler The process includes a step S4 of filling the space between the lower structure 4 and the seismic isolation foundation precast concrete unit 10 with concrete, and further a step S5 of pouring concrete to bury the lower anchor bar 63 and the portion of the lower structure 4 located below the seismic isolation foundation precast concrete unit 10, thereby forming a lower concrete portion 60, and a step S6 of pouring concrete to bury the upper anchor bar 73 and the portion of the upper structure 5 located above the seismic isolation foundation precast concrete unit 10, thereby forming an upper concrete portion 70. According to this configuration, by fixing the lower fixing bolts 35 to the lower structure 4, the seismic isolation foundation precast concrete unit 10 can be easily and firmly installed and fixed to the lower structure 4. Also, by fixing the upper fixing bolts 45 to the upper structure 5, the seismic isolation foundation precast concrete unit 10 and the upper structure 5 can be easily and firmly fixed to each other. Furthermore, for example, if the building skeleton 3 is made of cast-in-place concrete, it is necessary to wait for the concrete forming the lower skeleton 4 and the upper skeleton 5 to harden before installing the seismic isolation foundation precast concrete unit 10 on the lower skeleton 4, or after installing the seismic isolation foundation precast concrete unit 10 and before installing the upper skeleton 5 on it. In contrast, if the building skeleton 3 is a steel frame structure, it is not necessary to wait for the concrete forming the lower skeleton 4 and the upper skeleton 5 to harden before and after installing the seismic isolation foundation precast concrete unit 10. Therefore, the construction period can be shortened. Then, the lower anchor bars 63 are joined to the tips of the lower connecting rebars 36, and concrete is poured to bury the lower anchor bars 63 in the parts of the lower structure 4 located below the seismic isolation foundation precast concrete units 10, thereby forming the lower concrete part 60. In this manner, the lower anchor bars 63 and the parts of the lower structure 4 located below the seismic isolation foundation precast concrete units 10 are embedded in the lower concrete part 60, so that the seismic isolation foundation precast concrete units 10 and the lower structure 4 are firmly joined via the lower concrete part 60. Furthermore, upper anchor bars 73 are joined to the tips of the upper connecting rebars 46, and concrete is poured to embed the upper anchor bars 73 in the portions of the upper structure 5 located above the seismic isolation foundation precast concrete units 10, thereby forming an upper concrete section 70. In this manner, the upper anchor bars 73 and the portions of the upper structure 5 located above the seismic isolation foundation precast concrete units 10 are embedded in the upper concrete section 70, so that the seismic isolation foundation precast concrete units 10 and the upper structure 5 are firmly joined via the upper concrete section 70.

[0042] In particular, in this embodiment, a recess 31d recessed upward from the lower surface 31b is formed on the lower surface 31b of the seismic isolation lower foundation precast concrete portion 30. According to the above-mentioned configuration, when forming the lower concrete part 60 below the seismic isolation lower foundation precast concrete part 30, the concrete forming the lower concrete part 60 enters into the recess 31d of the seismic isolation lower foundation precast concrete part 30, forming a cotter between the lower concrete part 60 and the seismic isolation lower foundation precast concrete part 30, and they are engaged with each other. As a result, the seismic isolation lower foundation precast concrete part 30 and the lower concrete part 60 are firmly fixed together. Similarly, if a recess is formed on the upper surface 41t of the seismic isolation upper foundation precast concrete part 40, which recesses downward from the upper surface 41t, when the upper concrete part 70 is formed above the seismic isolation upper foundation precast concrete part 40, the concrete forming the upper concrete part 70 will enter the recess of the seismic isolation upper foundation precast concrete part 40, forming a cotter between the upper concrete part 70 and the seismic isolation upper foundation precast concrete part 40, and they will be engaged with each other. This allows the seismic isolation upper foundation precast concrete part 40 and the upper concrete part 70 to be firmly fixed together.

[0043] (Modification of the embodiment) Furthermore, the seismic isolation foundation precast concrete unit and the method of joining the building structure and the seismic isolation device of the present invention are not limited to the above-mentioned embodiment described with reference to the drawings, and various modified examples are possible within the technical scope. For example, in the above embodiment, the seismic isolation lower foundation precast concrete part 30 and the seismic isolation upper foundation precast concrete part 40 are provided with base plates 32, 42, but the base plates 32, 42 may not be provided and the lower flange plate 21 and upper flange plate 22 of the seismic isolation device 20 may be directly joined to the concrete bodies 31, 41. In addition, although the upper end of the lower fixing bolt 35 is welded to the lower base plate 32, the upper end of the lower fixing bolt 35 may also be made to protrude from the upper surface 31t of the concrete body 31 and joined to the lower flange plate 21 of the seismic isolation device 20. Similarly, although the lower end of the upper fixing bolt 45 is welded to the upper base plate 42, the lower end of the upper fixing bolt 45 may also protrude from the lower surface 41b of the concrete body 41 and be joined to the upper flange plate 22 of the seismic isolation device 20. In addition, the configurations described in the above embodiments can be selected or changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0044] 1 Building 36 Lower connection steel bar 2 Seismic isolation layer 37 Nut 3 Building structure 40 Precast concrete part of seismic isolation upper foundation 4 Lower frame 41t Top surface 4f flange 45 upper fixing bolt 5 Upper structure 46 Upper connecting bar 5g flange 47 nut 10. Seismic isolation foundation precast concrete unit 20 Seismic isolation device 60 Lower concrete section 21 Lower flange plate 63 Lower anchor bar 22 Upper flange plate 70 Upper concrete section 30 Precast concrete part of seismic isolation lower foundation 31b Bottom 73 Upper anchor bar 35 Lower fixing bolt 81, 91 Filler

Claims

1. A seismic isolation foundation precast concrete unit used in constructing a seismic isolation layer of a building, A seismic isolation device including a laminated rubber or a sliding bearing and an upper flange plate and a lower flange plate; A seismic isolation lower foundation precast concrete part provided below the seismic isolation device and joined to the lower flange plate; a seismic isolation upper foundation precast concrete section provided above the seismic isolation device and joined to the upper flange plate; The lower surface of the seismic isolation lower foundation precast concrete part is provided with a lower fixing bolt with a nut and a lower connecting steel bar protruding from the lower surface, The upper surface of the seismic isolation upper foundation precast concrete section is provided with upper fixing bolts with nuts and upper connecting rebars protruding from the upper surface. A seismic isolation foundation precast concrete unit.

2. A method for connecting a building skeleton and a seismic isolation device, comprising the steps of: constructing a lower structure; an installation process of the seismic isolation foundation precast concrete unit according to claim 1 above the lower structure, and filling a filler between the lower structure and the seismic isolation lower foundation precast concrete part of the seismic isolation foundation precast concrete unit; an upper structure installation process for installing an upper structure above the seismic isolation upper foundation precast concrete portion of the seismic isolation foundation precast concrete unit and filling a filler between the seismic isolation upper foundation precast concrete portion and the upper structure; A method for joining a building structure and a seismic isolation device, comprising:

3. The building structure is a steel frame structure, In the installation process of the seismic isolation foundation precast concrete unit, the lower fixing bolt is fixed to the lower structure, and then the filler is filled between the lower structure and the seismic isolation lower foundation precast concrete part of the seismic isolation foundation precast concrete unit, In the step of installing the upper structure, the upper fixing bolt is fixed to the upper structure, and then the filler is filled between the seismic isolation upper foundation precast concrete part of the seismic isolation foundation precast concrete unit and the upper structure, Furthermore, a step of joining a lower anchor bar to the tip of the lower connection rebar, and pouring concrete to embed the portion of the lower structure located below the seismic isolation foundation precast concrete unit and the lower anchor bar, thereby forming a lower concrete part; a step of joining an upper anchor bar to the tip of the upper connection rebar, and pouring concrete to embed the portion of the upper structure located above the seismic isolation foundation precast concrete unit and the upper anchor bar, thereby forming an upper concrete part; 3. The method for joining a building skeleton and a seismic isolation device according to claim 2, further comprising:

Images