Construction method of base isolation foundation structure, base isolation device used for the construction method, and plate material

Abstract

To provide a construction method of a base isolation foundation structure which enhances adhesion between a base isolation device and a foundation structure, which surely supports a building, and which can achieve suppression of damage by an earthquake, while suppressing increase in cost, to provide a base isolation device used in the construction method, and to provide a plate material.SOLUTION: A construction method of a base isolation foundation structure 1 which includes a foundation 10 and a base isolation device 20 includes: a foundation placing step of pouring concrete in a form, placing a ring plate 12 on which a lower flange plate 22 of the base isolation device 20 is placed, and placing the foundation 10 where a recess part 10a is provided which is recessed downward from an upper surface 12b of the ring plate 12; a base isolation device fixing step of joining the lower flange plate 22 on the ring plate 12, and fixing the base isolation device 20 on the foundation 10; and a filling step of filling a gap S formed by the recess part 10a and the lower flange plate 22 by a grout material 13 and adhering the foundation 10 and the lower flange plate 22.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a method for constructing a seismic isolation foundation structure, and a seismic isolation device and plate material used in the construction method, and in particular to a method for constructing a seismic isolation foundation structure using a filler material, and a seismic isolation device and plate material used in the construction method. [Background technology]

[0002] Conventionally, seismic isolation devices have been used to support buildings and reduce damage caused by earthquakes. A seismic isolation device is interposed between a lower foundation structure installed on the ground and an upper foundation structure that forms the skeleton of the building, and supports the building so that it can move relatively in the horizontal direction. This makes it possible to support the building while preventing ground shaking caused by an earthquake from being directly transmitted to the building, thereby reducing damage to the building.

[0003] The main components of a seismic isolation device are laminated rubber made of alternating layers of rubber and steel plates, a lower flange plate located below the laminated rubber and fixed to the lower foundation structure, and an upper flange plate located above the laminated rubber and fixed to the upper foundation structure. The laminated rubber absorbs horizontal shaking during an earthquake. Meanwhile, the lower flange plate and upper flange plate firmly secure the seismic isolation device to the lower foundation structure (ground) and upper foundation structure (building).

[0004] The lower foundation structure and the upper foundation structure are provided with a lower base plate and an upper base plate, respectively, to which the lower flange plate and the upper flange plate of the seismic isolation device are fixed. The lower base plate and the upper base plate have a high degree of flatness at the joint surfaces where they are joined to the lower flange plate and the upper flange plate. This allows the building to be reliably supported and the seismic isolation device to effectively absorb earthquake vibrations, making it possible to suppress damage such as the collapse of the building.

[0005] Patent Document 1 discloses a method for constructing a seismic isolation foundation structure that is composed of upper and lower foundation structures and a seismic isolation device interposed between the foundation structures. According to the method for constructing a seismic isolation foundation structure disclosed in Patent Document 1, the concrete poured between the concrete of the lower foundation structure and the lower base plate pushes out residual air bubbles, thereby improving adhesion between the two. As a result, earthquake vibrations are directly transmitted to and absorbed by the seismic isolation device, thereby improving the effect of suppressing damage caused by earthquakes. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-105444 A Summary of the Invention [Problem to be solved by the invention]

[0007] According to the method for constructing a seismic isolation foundation structure disclosed in Patent Document 1, the adhesion between the concrete of the lower foundation structure and the lower base plate can be increased, but the adhesion between the lower base plate and the seismic isolation device has not been sufficiently considered. To explain this point in detail, as described above, in order for the seismic isolation device to absorb earthquake tremors, it is necessary to bring the upper and lower flange plates into close contact with the base plate and to fix them firmly. Therefore, high flatness is required for the joint surface of the base plate, and flatness accuracy is ensured by at least one of a process to remove distortion of the base plate and a surface polishing process, and in many cases both processes. This has led to an increase in costs such as material costs and manufacturing costs.

[0008] On the other hand, it is also possible to fix the seismic isolation device directly to the foundation structure without using a base plate. However, in this case, it would be necessary to increase the adhesion between the seismic isolation device and the foundation structure, which could lead to increased costs due to work required to ensure the planar accuracy of the foundation structure.

[0009] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a method for constructing a seismic isolation foundation structure that can increase adhesion between the seismic isolation device and the foundation structure while suppressing increases in costs, thereby reliably supporting a building and suppressing damage caused by earthquakes, as well as a seismic isolation device and plate material used in the construction method. [Means for solving the problem]

[0010] The above problem is solved by the method for constructing a seismic isolation foundation structure of the present invention, which is a method for constructing a seismic isolation foundation structure comprising a foundation laid on the ground and a seismic isolation device fixed on the foundation, comprising: a foundation pouring process for pouring concrete into a formwork to pour the foundation, the foundation having a base portion on which the lower flange plate of the seismic isolation device is placed and a recess at the center of the base portion that is recessed below the upper surface of the base portion; a seismic isolation device fixing process for joining the lower flange plate onto the base portion and fixing the seismic isolation device onto the foundation; and a filling process for filling the gap formed by the recess and the lower flange plate with filling material to tightly adhere the foundation and the lower flange plate.

[0011] According to the above configuration, the foundation is provided with a base on which the seismic isolation device is placed and fixed, and a recess that is recessed below the upper surface of the base to form a gap between the base and the seismic isolation device. Therefore, the upper surface of the base that is joined to the lower flange plate needs to ensure high flatness, while the recess that is not joined to the lower flange plate does not need to be flat. Therefore, it is possible to reduce the material costs and manufacturing costs required to ensure flatness in the construction of the seismic isolation foundation structure. In addition, after the seismic isolation device is fixed, the gap formed between the recess and the lower flange plate is filled with a filler, which improves adhesion between the seismic isolation device and the foundation. This ensures that the building is supported reliably, and the seismic isolation device effectively absorbs earthquake vibrations, minimizing damage caused by earthquakes.

[0012] The filling step may include pouring the filler into a communication hole that vertically penetrates the lower flange plate and communicates with the gap, thereby filling the gap with the filler. According to the above configuration, the adhesion between the seismic isolation device and the foundation can be easily improved by pouring the filler into the communication hole. Therefore, it is possible to reliably support the building while reducing the workload and costs, and to effectively absorb earthquake vibrations with the seismic isolation device, thereby suppressing damage caused by earthquakes.

[0013] In addition, the foundation pouring process may include a formwork assembly process for assembling the formwork, a plate material installation process for installing a plate material having a shape corresponding to the peripheral edge of the lower flange plate, and a pouring process for pouring concrete into the formwork. According to the above-described configuration, the base portion can be formed by placing a plate material that has been flattened in advance on-site, which makes it possible to reduce the workload and keep costs down.

[0014] The filling step may include pouring the filler into a communicating groove that is formed in the plate material and communicates with the gap, thereby filling the gap with the filler. According to the above configuration, the adhesion between the seismic isolation device and the foundation can be easily improved by pouring the filler into the communicating groove formed in the plate material. Therefore, it is possible to reliably support the building while reducing the workload and cost, and to effectively absorb earthquake vibrations with the seismic isolation device, thereby suppressing damage caused by earthquakes.

[0015] The filling step may also include pouring the filler into a passage that is formed in the base and communicates with the gap, thereby filling the gap with the filler. According to the above configuration, the adhesion between the seismic isolation device and the foundation can be easily improved by pouring the filler into the communication passage formed in the foundation. Therefore, it is possible to reliably support the building while reducing the workload and costs, and to effectively absorb earthquake vibrations with the seismic isolation device, thereby suppressing damage caused by earthquakes.

[0016] In addition, the foundation pouring process may include a formwork assembly process for assembling a formwork for the foundation, a communicating pipe installation process for installing a hollow communicating pipe that forms the communicating passage within the formwork, and a pouring process for pouring concrete into the formwork. According to the above configuration, a communicating pipe that forms a communicating passage is installed within the formwork, and then concrete is poured in to lay the foundation, so that the communicating passage can be formed easily, thereby reducing the workload and suppressing costs.

[0017] In addition, the seismic isolation device may include a lower flange plate, an upper flange plate opposite the lower flange plate, and a support portion interposed between the lower flange plate and the upper flange plate for supporting a building constructed on the ground, and a plurality of the communicating holes may be formed on the peripheral portion of the lower flange plate at a predetermined interval from each other. According to the above configuration, since multiple communication holes are formed in the lower flange plate, the filler can be filled through one communication hole while the air in the gap can be discharged through the other communication holes, and the adhesion between the seismic isolation device and the foundation can be easily improved. Therefore, it is possible to reliably support the building while reducing the workload and suppressing costs, and it is also possible for the seismic isolation device to effectively absorb earthquake vibrations and suppress damage caused by earthquakes.

[0018] In addition, the plate material may have, when viewed in a plan view, a peripheral portion having a shape corresponding to the periphery of the lower flange plate, and a hollow central portion, and a plurality of the communicating grooves may be formed in the peripheral portion at a predetermined interval from each other. According to the above configuration, since multiple communicating grooves are formed in the plate material, the filler can be filled from one communicating groove while the air in the gap can be discharged from the other communicating grooves, and the adhesion between the seismic isolation device and the foundation can be easily improved. Therefore, it is possible to reliably support the building while reducing the workload and suppressing costs, and it is also possible for the seismic isolation device to effectively absorb earthquake vibrations and suppress damage caused by earthquakes. Effect of the Invention

[0019] The method for constructing a seismic isolation foundation structure of the present invention, and the seismic isolation device and plate material used in said construction method, make it possible to increase the adhesion between the seismic isolation device and the foundation member while suppressing increases in costs, thereby reliably supporting the building and suppressing damage caused by earthquakes. [Brief description of the drawings]

[0020] [Figure 1] This is an oblique view of the seismic isolation foundation structure viewed diagonally from above. [Diagram 2] This is a cross-sectional view of the seismic isolation foundation structure viewed from the front. [Diagram 3] The figure shows the flow of the construction method for a seismic isolation foundation structure. [Figure 4] This is a cross-sectional view of a seismic isolation foundation structure with a ring plate installed within a formwork. [Diagram 5] This is an oblique view of the foundation (foundation body and ring plate) viewed diagonally from above. [Figure 6] FIG. 2 is a cross-sectional view of a seismic isolation foundation structure before filling with grout material. [Figure 7] This is a cross-sectional view of a seismic isolation foundation structure while grout material is being filled. [Figure 8] This is a cross-sectional view of a seismic isolation foundation structure after filling with grout material has been completed. [Figure 9] 13 is a perspective view of a ring plate of a seismic isolation foundation structure according to a modified example, viewed obliquely from above. FIG. [Figure 10] This is a cross-sectional view of a seismic isolation foundation structure while filling material is being filled. [Figure 11]13 is an oblique view of a ring plate of a seismic isolation foundation structure according to a second modified example, viewed obliquely from above. FIG. [Figure 12] This is a cross-sectional view of a seismic isolation foundation structure while filling material is being filled. [Figure 13] A diagram showing the flow of a method for constructing a seismic isolation foundation structure according to the second embodiment. [Figure 14] This is a cross-sectional view of the seismic isolation foundation structure with the ring plate and injection pipe installed inside the formwork. [Figure 15] This is a cross-sectional view of a seismic isolation foundation structure while grout material is being filled. [Figure 16] This is a cross-sectional view of a seismic isolation foundation structure after filling with grout material has been completed. [Figure 17] FIG. 11 is a perspective view of a seismic isolation foundation structure according to a modified example, viewed obliquely from above. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, a method for constructing a seismic isolation foundation structure 1 according to one embodiment of the present invention (hereinafter, this embodiment) and a seismic isolation device 20 and a ring plate 12 used in the construction method will be described with reference to Figures 1 to 8. However, the embodiment described below is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and the present invention naturally includes equivalents thereof. The construction method of the seismic isolation foundation structure 1 of the present invention, and the seismic isolation device 20 and ring plate 12 used in the construction method are used to increase the adhesion between the seismic isolation device 20 and the foundation 10 while suppressing increases in costs, thereby reliably supporting the building and suppressing damage caused by earthquakes.

[0022] <<Outline of Seismic Isolation Foundation Structure 1>> First, an overview of a seismic isolation foundation structure 1 will be described with reference to FIGS. Fig. 1 is a perspective view showing the appearance of the seismic isolation foundation structure 1. Fig. 2 is a cross-sectional view of the seismic isolation foundation structure 1 as viewed from the front. As shown in Figures 1 and 2, the seismic isolation foundation structure 1 is composed of a foundation 10 built on the ground G, and a seismic isolation device 20 fixed on the foundation 10. Although not shown in Figures 1 and 2, the seismic isolation foundation structure 1 supports the foundation structure of a building constructed above the ground G.

[0023] The foundation 10 is built on the ground G and serves to provide a base that supports the seismic isolation device 20. In other words, the foundation 10 is built for the purpose of effectively exerting the seismic isolation performance of the seismic isolation device 20 that supports the foundation structure of the building, and is a foundation for fixing the seismic isolation device 20. The foundation 10 mainly comprises a foundation body 11 and a ring plate 12 located on the foundation body 11. The foundation body 11 is constructed by placing reinforcing bars inside a formwork M assembled into a rectangular shape in a plan view and pouring concrete.

[0024] The ring plate 12 has an annular shape corresponding to the shape (circular shape) of the lower flange plate 22 of the seismic isolation device 20, and is a metal plate material with a hollow center (see FIG. 5). The ring plate 12 corresponds to a base portion on which the seismic isolation device 20 described later is placed. To explain in detail, the ring plate 12 has been subjected to at least one of a process for removing distortion and a polishing process for ensuring the flatness of the upper surface 12b, and preferably both of these processes. Therefore, when the seismic isolation device 20 is placed on the upper surface 12b of the ring plate 12, the ring plate 12 can support the seismic isolation device 20 in a state of close contact with the seismic isolation device 20. The ring plate 12 corresponds to a plate material.

[0025] Fixing member insertion holes 12a, through which a plurality of fixing members 14 are inserted, are formed at equal intervals in the ring plate 12. The ring plate 12 is fixed to the foundation body 11 together with the seismic isolation device 20 by the fixing members 14.

[0026] The seismic isolation device 20 is interposed between the foundation 10 and the building, and is used to absorb horizontal shaking caused by an earthquake and suppress damage caused by the earthquake. The seismic isolation device 20 mainly comprises an upper flange plate 21, a lower flange plate 22, and a support part 23. The upper flange plate 21 has upper fixing holes 21a, and the lower flange plate 22 has lower fixing holes 22a formed in the peripheral parts, and is fixed to the foundation 10 by the fixing members 14.

[0027] Furthermore, eight communication holes 22b are formed at 45 degree intervals in the lower flange plate 22, penetrating the lower flange plate 22 in the up-down direction. As described below, the communication holes 22b communicate with a gap S formed between the lower flange plate 22 and the recess 10a of the foundation 10, and are used when pouring the grout material 13 into the gap S. The arrangement and number of the communication holes 22b are not limited to those shown in FIG. 1 and 2, the upper flange plate 21 and the lower flange plate 22 are shown as having a circular shape, however, the shapes of the upper flange plate 21 and the lower flange plate 22 are not limited to a circular shape.

[0028] The bearing portion 23 is interposed between the upper flange plate 21 and the lower flange plate 22, and supports the building. The bearing portion 23 has a horizontal elastic function and can convert shaking caused by an earthquake into long-period cyclic motion. A laminated rubber bearing made of laminated rubber in which thin rubber and steel plates are alternately laminated is used for the bearing portion 23. However, the bearing portion 23 is not limited to a laminated rubber bearing, and a sliding bearing or a rolling bearing may be used.

[0029] As described above, the ring plate 12 has an annular shape with a hollow center. Therefore, a recess 10a is formed in the base 10, which is recessed below the upper surface 12b of the ring plate 12, inside the ring plate 12. In other words, when the seismic isolation device 20 is fixed onto the base 10, a gap S is formed between the lower flange plate 22 and the recess 10a.

[0030] The grout material 13 is a mixture that has fluidity when filled (injected) into the void S and hardens over time. A representative example of the grout material 13 is so-called non-shrink mortar. By filling the void S with the grout material 13, the adhesion between the seismic isolation device 20 and the foundation 10 can be improved, and this allows the vibrations of an earthquake to be directly transmitted to the seismic isolation device 20, making it possible to suppress damage caused by an earthquake. The grout material 13 corresponds to a filler.

[0031] <<Construction method of seismic isolation foundation structure 1>> Next, the flow of construction of the seismic isolation foundation structure 1 will be described. Fig. 3 shows the flow of construction of the seismic isolation foundation structure 1. As shown in Fig. 3, first, a formwork M for pouring concrete for the foundation 10 is assembled (step S01, formwork assembly process). The formwork M is a frame body having side walls M1 perpendicular to each other and having a substantially square shape in a plan view.

[0032] Next, as shown in Fig. 4, a ring plate 12 is installed inside the formwork M (step S02, plate material installation step). To explain in detail, the ring plate 12 is supported by a plurality of fixing members 14, and the horizontal level is adjusted by a height adjustment mechanism of the fixing members 14. Note that the formwork may be assembled after the ring plate 12 is installed. In other words, the order of steps S02 and S01 may be reversed.

[0033] Next, concrete is poured inside the formwork M (step S03, foundation pouring step). To explain in detail, first, reinforcing bars are assembled inside the formwork M. Next, concrete is poured into the formwork. At this time, the concrete is poured so that the upper surface of the concrete is at the same height as the lower surface of the ring plate 12 (the height indicated by the two-dot chain line L in FIG. 4). Fig. 5 is a perspective view of the foundation 10 from diagonally above in a state in which the formwork M has been removed after concrete has been poured. As shown in Fig. 5, pouring of concrete forms a ring plate 12 (base portion) for placing the lower flange plate 22 of the seismic isolation device 20, and a recess 10a recessed below the upper surface 12b of the ring plate 12 at the center (inner side) of the ring plate 12.

[0034] Next, the seismic isolation device 20 is fixed onto the ring plate 12 (step S04, seismic isolation device fixing process). To explain in detail, first, the fastening portion of the fixing member 14 is removed from the ring plate 12. Next, the lower flange plate 22 of the seismic isolation device 20 is joined onto the ring plate 12. Subsequently, the fastening portion is inserted into the lower fixing hole 22a of the lower flange plate 22 and fastened again, thereby fixing the seismic isolation device 20 to the ring plate 12. Fig. 6 is a cross-sectional view of the seismic isolation foundation structure 1 in a state in which the seismic isolation device 20 is fixed onto the ring plate 12. As shown in Fig. 6, a gap S is formed between the lower flange plate 22 and the recess 10a.

[0035] Next, the gap S is filled with the grout material 13 (step S05, filling step). To explain in detail, the grout material 13 is injected through one of eight communication holes 22b formed at 45 degree intervals in the lower flange plate 22 as an injection hole. A pressure pump (not shown) can be used to inject the grout material 13. Fig. 7 is a cross-sectional view of the seismic isolation foundation structure 1 in a state in which the grout material 13 is being injected through the communication hole 22b to which the injection pipe T1 is joined. As shown in Fig. 7, the communication hole 22b is connected to the void S. Therefore, the grout material 13 that has reached the void S from the injection pipe T1 through the communication hole 22b diffuses inside the void S and fills the void S. Accordingly, the air inside the void S is discharged through the discharge pipe T2 from the communication hole 22b different from the injection hole, so that the foundation 10 and the seismic isolation device 20 are in close contact with each other.

[0036] When the grout material 13 is further injected, the gap S is completely filled with the grout material 13, as shown in Fig. 8. The injection pipe T1 and the discharge pipe T2 are sealed with a binding wire or tape, and are removed after the grout material 13 has hardened. With the above steps, the construction of the seismic isolation foundation structure 1 is completed.

[0037] As described above, according to the method for constructing the seismic isolation foundation structure 1 of the present invention, the foundation 10 is provided with the ring plate 12 as a base on which the seismic isolation device 20 is placed, and the recess 10a is recessed below the upper surface 12b of the ring plate 12 to form a gap S between the seismic isolation device 20. Then, after the seismic isolation device 20 is fixed to the ring plate 12, the gap S is filled with the grout material 13. This ensures adhesion between the foundation 10 and the seismic isolation device 20, reducing the burden of ensuring flatness of the joint surface that is joined to the lower flange plate 22, and making it possible to suppress cost increases. In addition, since the grout material 13 can increase the adhesion between the foundation 10 and the seismic isolation device 20, the seismic isolation device 20 can effectively absorb earthquake vibrations, thereby making it possible to suppress damage caused by earthquakes.

[0038] Furthermore, a plurality of communication holes 22b are formed at a predetermined interval from each other in the lower flange plate 22 of the seismic isolation device 20. This allows the grout material 13 to be injected from one communication hole 22b while the air inside the gap S is removed from the other communication holes 22b, and the adhesion between the seismic isolation device 20 and the foundation 10 can be easily improved. Therefore, it is possible to reliably support the building while reducing the workload and suppressing costs, and to effectively absorb earthquake vibrations by the seismic isolation device 20, thereby suppressing damage caused by the earthquake.

[0039] <<First Modification: Ring Plate 112>> The above describes a method for constructing a seismic isolation foundation structure 1 according to one embodiment of the present invention. However, the above-described embodiment is merely an example for making the present invention easier to understand and does not limit the present invention. In the above embodiment, the communication holes 22b formed in the peripheral portion of the lower flange plate 22 are connected to the void S, and the grout material 13 is injected through the communication holes 22b, but this is not limited to the above. A ring plate communication groove 112a communicating with the void S may be formed in the ring plate 112, and the grout material 13 may be injected through the ring plate communication groove 112a.

[0040] Fig. 9 is a perspective view of the ring plate 112 according to the first modified example, seen from diagonally above. As shown in Fig. 9, the ring plate 112 has an annular shape. The base 10 has a recess 10a on the inner side of the ring plate 112, which is recessed below an upper surface 112b of the ring plate 112. Furthermore, eight ring plate communication grooves 112a are formed on the upper surface 112b of the ring plate 112, which extend horizontally in the radial direction at 45 degree intervals. The ring plate communication grooves 112a communicate the outside of the ring plate 112 with the recess 10a on the inside. Therefore, when the seismic isolation device 20 is fixed above the ring plate 112, the grout material 13 can be injected through the ring plate communication grooves 112a into the gap S formed between the lower flange plate 22 of the seismic isolation device 20 and the recess 10a.

[0041] The number and arrangement of the ring plate communication grooves 112a are not limited to the number and arrangement shown in Fig. 9. The number of ring plate communication grooves 112a may be more than eight. In Fig. 9, the ring plate communication grooves 112a are formed on the upper surface 112b of the ring plate 112, but are not limited to this. The ring plate communication grooves 112a may be formed from the upper surface 112b to the lower surface so as to divide the ring plate 112, or may be formed on the lower surface of the ring plate 112.

[0042] Fig. 10 is a cross-sectional view of the seismic isolation foundation structure 1 in a state in which the seismic isolation device 20 is fixed to the ring plate 112 according to the modified example, and the grout material 13 is injected from the ring plate communication groove 112a to which the injection pipe T1 is joined. As shown in Fig. 10, the ring plate communication groove 112a communicates with the void S. Therefore, the grout material 13 that has passed through the ring plate communication groove 112a from the injection pipe T1 and reached the void S diffuses inside the void S and fills the void S. Accordingly, the air inside the void S is discharged to the outside of the void S through the discharge pipe T2 from the ring plate communication groove 112a different from the injection hole.

[0043] When the grout material 13 is further injected, the void S is completely filled with the grout material 13. Finally, similar to the above-mentioned embodiment, the injection pipe T1 and the discharge pipe T2 are sealed with a tie wire or tape, and are removed after the grout material 13 has hardened. With the above steps, the construction of the seismic isolation foundation structure 1 is completed.

[0044] Even when the ring plate 112 according to the first modified example described above is used, the same effects as those of the above-described embodiment can be achieved. In addition, since the ring plate communication groove 112a is formed in the upper surface 112b of the ring plate 112, the area for processing such as polishing to ensure flatness of the upper surface 112b of the ring plate 112 is reduced, which makes it possible to further reduce costs.

[0045] <<Second Modification: Foundation Body 211>> Also, a foundation communication groove 211a communicating with the void S may be formed in the foundation body 211, and the grout material 13 may be injected through the foundation communication groove 211a. FIG. 11 is a perspective view of a foundation 10 including a foundation body 211 and a ring plate 12 according to a second modified example, viewed from diagonally above. As shown in FIG. 11, the foundation body 211 has eight foundation communication grooves 211a extending horizontally at 45 degree intervals along the circumferential direction of the ring plate 12 having an annular shape. The foundation communication grooves 211a communicate the outside of the ring plate 12 with the recess 10a on the inside. Therefore, the grout material 13 can be injected through the foundation communication groove 211a into the void S formed between the lower flange plate 22 of the seismic isolation device 20 and the recess 10a. The number and arrangement of the foundation communication grooves 211a are not limited to the number and arrangement shown in Fig. 11. The number of the foundation communication grooves 211a may be more or less than eight.

[0046] 12 is a cross-sectional view of the seismic isolation foundation structure 1 in a state in which the seismic isolation device 20 is fixed to the foundation 10 having the foundation body 211 in the second modified example, and the grout material 13 is injected from the foundation communication groove 211a to which the injection pipe T1 is joined. As shown in FIG. 12, the foundation communication groove 211a communicates with the void S. Therefore, the grout material 13 that has passed through the foundation communication groove 211a from the injection pipe T1 and reached the void S diffuses inside the void S and fills the void S. Accordingly, the air inside the void S is discharged to the outside of the void S through the discharge pipe T2 from the foundation communication groove 211a different from the injection hole.

[0047] When the grout material 13 is further injected, the gap S is completely filled with the grout material 13. As in the above-described embodiment, the injection pipe T1 and the discharge pipe T2 are finally sealed with a tie wire or tape, and are removed after the grout material 13 has hardened. With the above steps, the construction of the seismic isolation foundation structure 1 is completed.

[0048] Even in the case where the foundation body 211 according to the above-described second modified example is used, the same effects as those of the above-described embodiment can be achieved. In addition, since the seismic isolation foundation structure 1 of the present invention can be constructed without special processing of the seismic isolation device 20 or the ring plate 12, there is no need to newly manufacture the seismic isolation device 20 or the ring plate 12. This makes it possible to further reduce costs.

[0049] <<Second embodiment>> Next, a method for constructing the seismic isolation foundation structure 1 according to the second embodiment will be described. In the above-mentioned embodiment, the grout material 13 is filled from the side (the radial end) of the void S, but the grout material 13 may be filled from below the void S by embedding an injection pipe T1 for filling the grout material 13 inside the foundation main body 411. The injection pipe T1 corresponds to a communication passage.

[0050] 13 shows the flow of the method for constructing the seismic isolation foundation structure 1 according to the second embodiment. As in the above-mentioned embodiment, first, the formwork M for pouring concrete for the foundation 10 is assembled (step S11, formwork assembly step), and then the ring plate 12 is installed in the formwork (step S12, plate material installation step). Since the above steps are the same as those in the above-mentioned embodiment, detailed explanations are omitted.

[0051] Next, the injection pipe T1 is installed inside the formwork M (step S13, communication pipe installation step). In detail, as shown in FIG. 14, the injection pipe T1 is arranged so that one end, the injection port T1a, protrudes from the side wall M1 of the formwork M. The other end, the extraction port T1b, is arranged at the center position of the ring plate 12 having an annular shape, so as to be at the same height as the lower surface of the ring plate 12 (the height shown by the two-dot chain line L in FIG. 13). This makes it possible to fill the grout material 13 from below the gap S through the injection pipe T1 when the concrete of the foundation body 11 is poured inside the formwork M. The extraction port T1b can be installed to the ground G by using the fixing member 14, but the fixing method of the injection pipe T1 is not limited to this.

[0052] Next, similarly to the above-described embodiment, concrete is poured inside the formwork M (step S14, foundation pouring step). The concrete is poured so that its upper surface is at the same height as the lower surface of the ring plate 12. Therefore, the extraction port T1b is exposed on the surface of the concrete. Next, the seismic isolation device 20 is fixed onto the ring plate 12 (step S15, seismic isolation device fixing process). As a result, a gap S is formed between the lower flange plate 22 of the seismic isolation device 20 and the recess 10a of the foundation 10. The gap S is connected to an injection pipe T1.

[0053] Next, the gap S is filled with the grout material 13 (step S16, filling step). To explain in detail, the grout material 13 is pumped from the injection port T1a of the injection pipe T1 toward the extraction port T1b by using a pressure pump. Fig. 15 is a cross-sectional view of the seismic isolation foundation structure 1 in a state in which the grout material 13 is being injected through the injection pipe T1. As shown in Fig. 15, the extraction port T1b of the injection pipe T1 is connected to the void S. Therefore, the grout material 13 that has reached the void S from the injection pipe T1 diffuses inside the void S and fills the void S. Accordingly, the air inside the void S is discharged through the discharge pipe T2 from the communication hole 22b formed in the lower flange plate 22 of the seismic isolation device 20.

[0054] When the grout material 13 is further injected, the gap S is completely filled with the grout material 13, as shown in Fig. 16. Finally, the injection pipe T1 and the discharge pipe T2 are sealed with a tie wire or tape, and are removed after the grout material 13 has hardened. With the above steps, the construction of the seismic isolation foundation structure 1 is completed.

[0055] Even when the ring plate 112 according to the second embodiment described above is used, the same effects as those of the above-described embodiment can be achieved. According to the above construction method, the grout material 13 can be injected from the center of the void S, so that the entire void S can be filled with the grout material 13 evenly.

[0056] In addition, although the extraction port T1b has been described as being located at the center of the ring plate 12 having an annular shape, this is not limited thereto. The extraction port T1b only needs to communicate with the space S formed by the lower flange plate 22 and the recess 10a, and may be attached to the inner periphery of the ring plate 12.

[0057] In the above embodiment, the lower flange plate 22 has a circular shape in a plan view, and the ring plate 12 has an annular shape, but the present invention is not limited to this. Fig. 17 shows a seismic isolation device 520 having rectangular upper flange plate 521 and lower flange plate 522, and a foundation 10 provided with a rectangular plate 512 of the same shape. Rectangular plate 512 corresponds to a base portion on which seismic isolation device 520 is placed. The seismic isolation device 520 and foundation 10 shown in Fig. 17 can also achieve the object of the present invention and achieve the same effects as the above-mentioned embodiments.

[0058] In the above-described embodiment, the ring plate 12 is used as the base of the foundation body 11, but the present invention is not limited to this. The base may be formed by flattening the upper surface of the foundation body 11. In this case, the ring plate 12 is not necessary, and therefore the number of parts of the seismic isolation foundation structure 1 can be reduced. [Explanation of symbols]

[0059] 1. Seismic isolation foundation structure 10 Basics 10a Recess 11 Basic Body 12 Ring plate (base part) 12a Fixing member insertion hole 12b Top side 13 Grout material (filler) 14 Fixing member 20 Seismic isolation device 21 Upper flange plate 21a Upper fixing hole 22 Lower flange plate 22a Lower fixing hole 22b Communication hole 23 Bearing part 112 Ring Plate 112a Ring plate connecting groove 112b Top side 211 Foundation Body 211a Foundation communication groove 411 Foundation Body 512 Rectangular plate (base part) 520 Vibration isolation device 521 Upper flange plate 522 Lower flange plate 523 Bearing part G. Ground M Formwork M1 side wall S void T1 injection tube T1a inlet T1b extraction port T2 discharge pipe

Claims

1. A method for constructing a seismic isolation foundation structure including a foundation built on the ground and a seismic isolation device fixed on the foundation, comprising: A foundation pouring process in which concrete is poured into a formwork to form the foundation, the foundation having a base portion on which a lower flange plate of the seismic isolation device is placed and a recessed portion recessed downward from an upper surface of the base portion at the center of the base portion; a seismic isolation device fixing process of joining the lower flange plate onto the base portion and fixing the seismic isolation device onto the foundation; A method for constructing a seismic isolation foundation structure, comprising: a filling step of filling the gap formed by the recess and the lower flange plate with a filling material to tightly adhere the foundation and the lower flange plate.

2. The method for constructing a seismic isolation foundation structure as described in claim 1, characterized in that the filling process fills the gap with the filler by pouring the filler into a communicating hole that penetrates the lower flange plate in the vertical direction and communicates with the gap.

3. The method for constructing a seismic isolation foundation structure as described in claim 1, characterized in that the foundation pouring process includes a formwork assembly process for assembling the formwork, a plate material installation process for installing a plate material having a shape corresponding to the periphery of the lower flange plate, and a pouring process for pouring concrete into the formwork.

4. The method for constructing a seismic isolation foundation structure according to claim 3, characterized in that the filling step comprises pouring the filler material into a communicating groove formed in the plate material and communicating with the void, thereby filling the void with the filler material.

5. The method for constructing a seismic isolation foundation structure as described in claim 1, characterized in that the filling step comprises pouring the filler into a communicating passage formed in the foundation and communicating with the void, thereby filling the void with the filler.

6. The method for constructing a seismic isolation foundation structure as described in claim 5, characterized in that the foundation pouring process includes a formwork assembly process for assembling a formwork for the foundation, a communicating pipe installation process for installing a hollow communicating pipe that forms the communicating passage within the formwork, and a pouring process for pouring concrete into the formwork.

7. A seismic isolation device used in the method for constructing a seismic isolation foundation structure according to claim 2, The lower flange plate; an upper flange plate facing the lower flange plate; a support portion interposed between the lower flange plate and the upper flange plate and configured to support a building constructed on the ground; A seismic isolation device characterized in that a plurality of the communicating holes are formed at a predetermined interval from each other on the peripheral portion of the lower flange plate.

8. A plate material used in the method for constructing a seismic isolation foundation structure according to claim 4, A peripheral portion having a shape corresponding to a peripheral edge of the lower flange plate in a plan view; a hollow central portion; A plate material, characterized in that a plurality of the communicating grooves are formed at a predetermined interval from each other on the peripheral edge portion.

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