Installation structure of upper member

Abstract

To suppress a defect when installing an upper member.SOLUTION: An installation structure comprises: a substructure; an annular plate that has a plate hole penetrating in a thickness direction and is installed on a top face of the substructure; an upper member installed on the plate; a joint material to join the substructure and the upper member by penetrating the plate hole; a filler that is charged between the substructure and the upper member on the inside surrounded by the plate; a fastening material that is embedded in the substructure and has joint hole having a female screw for joining the joint material and is fixed to the plate so that the plate hole and the joint hole are substantially concentrically located; and an annular cushion body that is placed around the joint hole and compressed by pressing force of the upper member. The cushion body is placed at a site at the same height as a site where the filler contacts on a top face of the plate or inside the plate hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an upper member installation structure. [Background technology]

[0002] One known method for installing, for example, a seismic isolation device as an upper member on top of a substructure is to place a ring-shaped base plate on top of the substructure, pour filler material inside the base plate so that it bulges in the center, and then place the seismic isolation device on top of it to crush the filler material (see, for example, Patent Document 1). This method ensures high fillability when filling the gap below the seismic isolation device (between the lower flange of the seismic isolation device and the substructure) with filler material. In addition, nuts for screwing onto mounting bolts (installation bolts) that secure the seismic isolation device are embedded in the lower structure below the base plate. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-59686 Summary of the Invention [Problem to be solved by the invention]

[0004] When the seismic isolation device (specifically the lower flange) compresses the filler material, the filler material that spreads from the center outward may flow through the plate holes in the base plate and into the threaded holes of the nuts (female threads).If the filler material flows into the threaded holes, it may interfere with the threading of the mounting bolts (male threads) that attach the seismic isolation device (upper component), or the filler may become stuck and make it impossible to remove the mounting bolts when replacing the seismic isolation device. The present invention has been made in view of the above problem, and an object of the present invention is to suppress problems that occur when installing an upper member. [Means for solving the problem]

[0005] The main invention to achieve the above object is: The substructure and an annular plate having a plate hole penetrating in a thickness direction and installed on an upper surface of the lower structure; an upper member placed on the plate; a joining material that passes through the plate hole and joins the lower structure and the upper member; a filler material filled between the lower structure and the upper member inside the space surrounded by the plate; a fixing member that is embedded in the lower structure, has a connecting hole with a female thread for connecting the connecting material, and is fixed to the plate so that the plate hole and the connecting hole are positioned approximately concentrically; an annular cushion body placed around the joining hole and compressed by the pressure of the upper member; Equipped with The upper member installation structure is characterized in that the cushion body is placed on a portion of the upper surface of the plate that is at the same height as the portion that contacts the filler, or on the inside of the plate hole. Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Effects of the Invention]

[0006] According to the present invention, problems that occur when installing the upper member can be suppressed. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic cross-sectional view showing the installation structure of a seismic isolation device in this embodiment. [Figure 2] 10A and 10B are diagrams for explaining the relationship between a base plate, a cushion ring, and a fixing material. [Figure 3] FIG. 3A is a vertical cross-sectional view showing the state when the seismic isolation device is installed, and FIG. 3B is a view showing the state when the seismic isolation device is installed, seen from above with the seismic isolation device in perspective. [Figure 4]10A to 10C are explanatory diagrams showing the state of the seismic isolation device when pressed downward. [Figure 5] A schematic cross-sectional view showing the installation structure of a seismic isolation device when the upper part of the high nut is joined to the inner surface of the plate hole. [Figure 6] FIG. 10 is a view showing a state in which the cushion ring is attached to the lower surface of the lower flange. DETAILED DESCRIPTION OF THE INVENTION

[0008] At least the following matters will become clear from the description of this specification and the accompanying drawings. (Aspect 1) The substructure and an annular plate having a plate hole penetrating in a thickness direction and installed on an upper surface of the lower structure; an upper member placed on the plate; a joining material that passes through the plate hole and joins the lower structure and the upper member; a filler material filled between the lower structure and the upper member inside the space surrounded by the plate; a fixing member that is embedded in the lower structure, has a connecting hole with a female thread for connecting the connecting material, and is fixed to the plate so that the plate hole and the connecting hole are positioned approximately concentrically; an annular cushion body placed around the joining hole and compressed by the pressure of the upper member; Equipped with An upper member installation structure characterized in that the cushion body is placed on a portion of the upper surface of the plate that is at the same height as the portion that contacts the filler, or inside the plate hole.

[0009] According to the upper member installation structure of the first aspect, the annular cushion prevents the filler from flowing into the joining hole when the upper member is installed, thereby reducing problems during installation of the upper member. In this case, the cushion is placed on the upper surface of the plate at the same height as the portion of the plate that contacts the filler, or inside the plate hole. This eliminates the need to process the plate to form a portion around the plate hole where the cushion can be placed. It is also possible to simply position the cushion around the joining hole. This results in excellent manufacturability of the plate and ease of installation of the upper member.

[0010] (Aspect 2) The upper member installation structure according to aspect 1 is characterized in that the upper end of the fixing material is joined to the lower surface of the plate.

[0011] According to the upper member installation structure of aspect 2, the upper end of the fixing material is joined to the lower surface of the plate, making it possible to easily position the plate and fixing material while ensuring that they are aligned with each other.

[0012] (Aspect 3) The upper member installation structure according to aspect 1 is characterized in that the upper portion of the fixing material is joined to the inner peripheral surface of the plate hole.

[0013] According to the upper member installation structure of the third aspect, the upper part of the anchoring member is bonded to the inner peripheral surface of the plate hole, allowing the plate hole and the joining hole to be positioned approximately concentrically. This makes it easy to position the anchoring member and the plate when joining them, and it is highly manufacturable. Furthermore, because the upper part of the anchoring member is bonded to the inner peripheral surface of the plate hole, it is possible to reduce bending stress caused by the horizontal force of the bolt.

[0014] (Aspect 4) The upper member installation structure according to any one of aspects 1 to 3 is characterized in that the cushion body is adhered to the upper member.

[0015] According to the upper member installation structure of aspect 4, the cushion body is adhered to the upper member, so that the cushion body can be placed between the upper member and the lower structure simply by placing the upper member with the cushion body adhered thereto on the lower structure.

[0016] === Implementation form === Hereinafter, an upper member installation structure according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, an installation structure of a seismic isolation device in which a seismic isolation device is installed as an upper member on a lower structure will be described as an example.

[0017] <<Seismic isolation device installation structure>> As shown in Figure 1, the installation structure of the seismic isolation device is a structure in which a seismic isolation device 10 is installed as an upper component on a lower structure 1, and is composed of a base plate 20, a cushion ring 30, an anchoring material 40, mounting bolts 16, and a filler material 70.

[0018] The substructure 1 is, for example, a structure made of concrete. The seismic isolation structure of this embodiment is a mid-floor seismic isolation structure in which a seismic isolation layer is provided in the middle floors of a building, and the substructure 1 is the lower floor of the building. A seismic isolation device 10 is installed between this substructure 1 and the upper floors of the building (superstructure (not shown)). However, this is not limited to this, and for example, base isolation in which a base isolation layer is provided at the bottom of a building may also be used. In the case of base isolation, the substructure 1 is installed on the ground.

[0019] The seismic isolation device 10 is interposed between the substructure 1 and the superstructure, and supports the superstructure while lengthening the period of horizontal vibration of the superstructure (seismically isolating and supporting). The seismic isolation device 10 is configured by sandwiching a laminated rubber 12 between an upper flange 13 and a lower flange 14.

[0020] The laminated rubber 12 is, for example, a cylindrical cushion body formed by alternately stacking thin circular steel plates and rubber layers one above the other. However, the laminated rubber 12 is not limited to this, and may be, for example, a columnar cushion body with a polygonal bottom.

[0021] The upper flange 13 and the lower flange 14 are plate-like members (for example, circular steel plates) having an outer diameter larger than that of the laminated rubber 12. The upper flange 13 has a plurality of flange holes 13a formed therethrough in the vertical direction (plate thickness direction) outside the laminated rubber 12. The lower flange 14 has a plurality of flange holes 14a formed therethrough in the vertical direction (plate thickness direction) outside the laminated rubber 12.

[0022] The upper flange 13 is fixed to an upper structure (not shown) by mounting bolts (not shown), the explanation of which will be omitted here. The lower flange 14 is fixed to an anchoring material 40 (in other words, the lower structure 1) via a base plate 20 by mounting bolts 16. As will be described later, the cushion ring 30 and the anchoring material 40 are integrally formed on the base plate 20.

[0023] The mounting bolts 16 are connecting members that connect the lower flange 14 and the substructure 1. In this embodiment, headed bolts are used, but threaded rods and nuts may also be used. Male threads are formed around the bolt portions of the mounting bolts 16. The bolt portions of the mounting bolts 16 pass through flange holes 14a in the lower flange 14 and plate holes 20a (described below) in the base plate 20, and are threadedly engaged (connected) with threaded holes 41a (described below) in the high nuts 41 of the anchoring members 40. In this way, the mounting bolts 16 integrally fasten the lower flange 14, base plate 20, and anchoring members 40 (high nuts 41), and pressure-bond the lower flange 14 to the base plate 20.

[0024] As shown in Fig. 2, the base plate 20 (corresponding to a plate) is a member for installing the seismic isolation device 10, and is a steel plate having a circular outer shape and a ring shape (circular ring) with a concentric circular through-hole 21 formed inside, and a flat upper surface 20b. In this example, the shape of the bottom flange 14 of the seismic isolation device 10 is circular, so the base plate 20 is also circular to correspond to this, but the shape is not limited to circular and is determined according to the shape of the bottom flange 14. For example, if the bottom flange 14 is rectangular or polygonal, the base plate 20 is formed in a corresponding rectangular or polygonal shape.

[0025] The base plate 20 has plate holes 20a that penetrate in the thickness direction (here, the up-down direction) at positions corresponding to the multiple flange holes 14a of the lower flange 14. The flange holes 14a of the lower flange 14 and the plate holes 20a of the base plate 20 are simple through holes without threading. The inner diameter of the plate holes 20a is formed to be equal to or greater than the outer diameter of the bolt portion of the mounting bolt 16 (the diameter of the threaded hole 41a of the high nut 41, which will be described later).

[0026] The cushion ring 30 is an annular cushioning body made of a cushioning material (sponge) and is provided corresponding to each of the multiple (here, 12) plate holes 20a of the base plate 20. Examples of cushioning materials include elastic materials such as polyurethane foam, polyethylene foam, and rubber sponge, as well as plastically deformable materials such as clay. Examples of rubber sponge types include NR (natural rubber), EPDM (ethylene propylene), SI (silicon), and NBR (nitrile).

[0027] The cushion ring 30 surrounds each plate hole 20a provided in the base plate 20 and the screw hole 41a of the high nut 41, and is placed on the base plate 20 with the plate holes 20a and the cushion ring 30 arranged approximately concentrically.

[0028] When the cushion ring 30 is placed on the base plate 20 and the seismic isolation device 10 is installed on top of it, it is pressed and compressed by the seismic isolation device 10. The cushion ring 30 is designed so that when compressed, the distance between the lower surface of the lower flange 14 and the upper surface 20b of the base plate 20 is 3 mm or less, and more preferably 2 mm or less. The thinner the cushion ring 30 is after being pressed, the better.

[0029] Because the cushion ring 30 is compressed and expands horizontally (here, in the radial direction of the plate hole 20a), the inner diameter of the cushion ring 30 is designed so that a gap is formed between it and the bolt portion of the mounting bolt 16 that is screwed into the screw hole 41a. In other words, the inner diameter of the cushion ring 30 is larger than the outer diameter of the bolt portion of the mounting bolt 16.

[0030] As shown in FIG. 1, the fixing material 40 includes a high nut 41, a threaded rod 43 (anchor bolt), a fixing plate 44, and nuts 42, 45, and 46.

[0031] The high nut (also referred to as a long nut) 41 is a nut that is long in the axial direction (here, the vertical direction) and has a threaded hole 41a (corresponding to a joining hole) that penetrates vertically. The threaded hole 41a has a female thread on its inner peripheral surface. The high nut 41 is joined to the base plate 20 by welding while abutting against the lower surface 20e of the base plate 20 so that the threaded hole 41a communicates with the plate hole 20a of the base plate 20.

[0032] The mounting bolt 16 is screwed (joined) to one side (upper side) of the screw hole 41a through the flange hole 14a of the lower flange 14 and the plate hole 20a of the base plate 20. As will be described later, when the seismic isolation device 10 (lower flange 14) is installed on the base plate 20, a guide pin 100 (described later) is screwed (joined) to that portion. Furthermore, a threaded rod 43 is screwed (joined) to the other side (lower side) of the threaded hole 41a.

[0033] The threaded rod 43 is a member for fixing to the substructure 1, and is embedded in the substructure 1. The threaded rod 43 is a headless cut bolt, and has a male thread formed around its entire length.

[0034] The anchor plate 44 is a steel plate-like member (steel plate) that resists stress that acts to pull the high nut 41 and the threaded rod 43 out of the substructure 1 due to vibrations such as an earthquake, and is fixed at a predetermined position on the threaded rod 43. More specifically, an unthreaded through-hole (not shown) is formed, for example in the center of the anchor plate 44, and the threaded rod 43 is inserted into this through-hole, and the anchor plate 44 is clamped and tightened by nuts 45 and 46. In this way, the anchor plate 44 is fixed at a predetermined position on the threaded rod 43 (here, the lower end side).

[0035] Nut 42 is a member for preventing threaded rod 43 from rotating relative to high nut 41, and is provided at the lower end of high nut 41 (threaded onto threaded rod 43). Furthermore, nuts 45 and 46 are members for fixing fixing plate 44 to a predetermined position on threaded rod 43, as described above, and are provided so as to sandwich fixing plate 44 therebetween (threaded onto threaded rod 43).

[0036] The filler 70 is filled between the substructure 1 and the lower flange 14 of the seismic isolation device 10 inside the area surrounded by the base plate 20 (specifically, within the circular penetration 21 of the base plate 20). The filler 70 is, for example, a non-shrink cement, more specifically, a non-shrink cement that is thixotropic and exhibits high fluidity under pressure. Here, thixotropy refers to the property of not having fluidity in a stationary state but becoming fluid when stirred or shaken. Due to this thixotropy, when the filler 70 is piled up in a mound (described below), it is prevented from spreading to the surroundings and maintains its shape. Furthermore, when pressurized (pressed) by the seismic isolation device 10 (lower flange 14), the filler becomes fluid and spreads to the surroundings.

[0037] In this embodiment, by providing the cushion ring 30, it is possible to prevent the filler 70 from flowing into the screw hole 41a of the high nut 41 when the filler 70 spreads, as will be described later.

[0038] <<Installation of seismic isolation devices>> When installing the seismic isolation device 10 of this embodiment, first, the fixing material 40 and the cushion ring 30 are attached to the base plate 20. At this time, the fixing material 40 is welded in such a way that the upper end of the high nut 41 abuts (contacts) against the lower surface 20e of the base plate 20 so that the plate hole 20a of the base plate 20 and the screw hole 41a of the high nut 41 of the fixing material 40 communicate with each other. In addition, the cushion ring 30 is placed so as to surround the plate hole 20a and the screw hole 41a.

[0039] Next, the base plate 20 (including the anchoring material 40 and cushion ring 30) is placed above the reinforcing bars (not shown) that have been arranged to form the substructure 1, and a formwork (not shown) is erected, and concrete is poured into the formwork to form the substructure 1. At this time, a portion of the base plate 20 in the thickness direction (lower portion) and the anchoring material 40 are embedded in the substructure 1.

[0040] Next, the guide pin 100 is joined to the screw hole 41a of the high nut 41 (anchoring material 40) through the plate hole 20a of the base plate 20. The guide pin 100 is a member for aligning the flange hole 14a of the lower flange 14 with the plate hole 20a of the base plate 20 when installing the seismic isolation device 10, and has a male thread with the same diameter as the mounting bolt 16 formed on the outer periphery of the lower end side.

[0041] Furthermore, the filler 70 is applied to the upper surface of the lower structure 1 inside the circular through-hole 21 of the base plate 20 (the inner region surrounded by the base plate 20) so that the center is raised (in a mountain shape). More specifically, the filler 70 is piled up higher than the upper surface 20b of the base plate 20.

[0042] Next, the seismic isolation device 10 is placed on the base plate 20 and the filler 70. At this time, as shown in FIG. 3A, the guide pins 100 are inserted (penetrated) into the flange holes 14a of the lower flange 14 of the seismic isolation device 10, and the seismic isolation device 10 is placed on the substructure 1 (here, on the filler 70) and pressed downward. As described above, because the filler 70 is piled higher than the upper surface 20b of the base plate 20, the filler 70 is pressed by the seismic isolation device 10 (lower flange 14) and spreads from the center outward as shown in FIGS. 3B and 4. At this time, the lower flange 14 presses the cushion rings 30 together with the filler 70.

[0043] The cushion ring 30 is pressed against the lower flange 14 and compressed to a height of 2 to 3 mm or less. That is, it is compressed until the distance H between the lower surface of the lower flange 14 and the upper surface 20b of the base plate 20 is 2 to 3 mm or less. The minimum gap that the filler 70 can fill is approximately 2 mm, so if the distance is less than this, the filler 70 is less likely to drip sideways after filling is complete. Therefore, when the distance between the lower surface of the lower flange 14 and the upper surface 20b of the base plate 20 is 2 to 3 mm or less, the filler 70 no longer flows between them, and the seismic isolation device 10 is placed with the filler 70 filled between the lower surface of the lower flange 14 and the upper surface 20b of the base plate 20. In this way, the seismic isolation device 10 (lower flange 14) can crush (expand) the filler 70, allowing the filler 70 to fill the gap between the lower flange 14 and the substructure 1. Here, since the upper surface 20b of the base plate 20 is flat, a portion 20c on the upper surface 20b where the cushion ring 30 is placed and a portion 20d on the outside of the cushion ring 30 where the filler 70 comes into contact are at the same height.

[0044] If the cushion ring 30 were not provided, the expanded filler 70 could flow into the threaded hole 41a of the high nut 41, causing a problem. For example, this could cause an obstacle when threading the mounting bolt 16 into the threaded hole 41a. Furthermore, if the filler 70 gets into the threaded hole 41a, the filler 70 would not come out of the lower flange 14, making it impossible to check whether the filler 70 is filled. Alternatively, the filler 70 could become stuck when replacing the seismic isolation device 10, making it impossible to remove the mounting bolt 16. In contrast to this, in this embodiment, the cushion ring 30 is provided, so that the filler 70 can be prevented from flowing into the screw hole 41a of the high nut 41.

[0045] Specifically, first, as shown on the left side of FIG. 4, when the filler 70 becomes higher than the upper surface 20b of the base plate 20, the cushion ring 30 can prevent the filler 70 from flowing into the screw hole 41a.

[0046] Furthermore, when the seismic isolation device 10 (lower flange 14) is pressed further downward, the lower surface of the lower flange 14 comes into contact with the upper end of the cushion ring 30, as shown in the center of Fig. 4. As a result, the lower flange 14 and the cushion ring 30 come into contact with each other, and the filler material 70 spreads outward around the cushion ring 30. In other words, it does not enter the screw hole 41a (it is possible to reliably prevent the filler material 70 from entering the screw hole 41a).

[0047] When the seismic isolation device 10 (lower flange 14) is pressed further downward, as shown on the right side of Figure 4, the cushion ring 30 is compressed by the seismic isolation device 10 (lower flange 14) to a height of 2 to 3 mm or less while preventing the filler 70 from flowing into the screw holes 41a. Note that the thinner the cushion ring 30 is after being pressed, the better. The filler 70 between the lower flange 14 and the base plate 20 is pushed outward until it reaches the height of the compressed cushion ring 30, and the lower flange 14 is placed on the base plate 20. This allows the lower flange 14 to be placed on the base plate 20 via the filler 70 while preventing the filler 70 from flowing into the plate holes 20a.

[0048] Then, by placing the seismic isolation device 10, it is confirmed that the filler 70 has leaked from the entire outer periphery of the seismic isolation device 10 (lower flange 14). This makes it possible to confirm that the filler 70 has been filled.

[0049] After confirming that the filling is complete, the guide pin 100 is removed and the mounting bolt 16 is tightened. That is, the bolt portion (male thread) of the mounting bolt 16 is passed through the flange hole 14a formed in the lower flange 14 and the plate hole 20a formed in the base plate 20, and is screwed into the screw hole 41a (female thread) of the fixing material 40. This joins the lower flange 14 and the fixing material 40 via the base plate 20. That is, the lower flange 14, base plate 20, and fixing material 40 can be fastened together as a single unit.

[0050] As described above, in this embodiment, the cushion ring 30 provided on the outside of the plate hole 20a of the base plate 20 is compressed by the seismic isolation device 10 (lower flange 14) and prevents the filler material 70 from flowing into the screw hole 41a of the fixing material 40. This makes it possible to prevent problems caused by the filler material 70 flowing into the screw hole 41a when the seismic isolation device 10 (lower flange 14) is placed on the base plate 20.

[0051] According to the installation structure for the seismic isolation device 10 of this embodiment, when the seismic isolation device 10 is installed, the annular cushion ring 30 can prevent the filler 70 from flowing into the threaded hole 41a of the high nut 41, thereby reducing problems when installing the seismic isolation device 10. Furthermore, on the upper surface 20b of the base plate 20, the portion 20d with which the filler 70 comes into contact and the portion 20c on which the cushion ring 30 is placed are at the same height. This eliminates the need for processing to provide the cushion body installation portion 20b around the plate hole 20a in the base plate 20. Furthermore, it is sufficient to simply place the cushion ring 30 on the upper surface 20b of the base plate 20 so as to surround the plate hole 20a. This results in excellent manufacturability of the base plate 20 and excellent workability when installing the seismic isolation device 10.

[0052] Furthermore, since the upper end of the high nut 41 is joined to the lower surface 20e of the base plate 20, the base plate 20 and the high nut 41 can be easily arranged with their positions reliably aligned with each other.

[0053] In the above embodiment, an example has been described in which the upper end of the high nut 41 of the fixing member 40 is welded to the base plate 20 while abutting against the lower surface 20e of the base plate 20, but this is not limiting, and for example, as shown in Fig. 5, a configuration in which the upper part of the high nut 41 is inserted into the plate hole 20a and joined to the inner circumferential surface of the plate hole 20a is also acceptable. In this case, the screw hole 41a can be easily positioned at the center of the plate hole 20a, making it easy to position the fixing member 40 and the base plate 20 when joining them.

[0054] Furthermore, by joining the high nut 41 to the base plate 20 so that the upper end of the high nut 41 forms a plane at the same height as the upper surface 20b of the base plate 20 and flattening the portion 20c on which the cushion ring 30 is placed, the cushion ring 30 can be easily placed vertically on the flat base plate 20. This provides excellent manufacturability and ease of installation. Note that when the upper portion of the high nut 41 is joined to the inner peripheral surface of the plate hole 20a, the upper surface of the high nut 41 may be recessed lower than the upper surface 20b of the base plate 20, and the cushion ring 30 may be placed on the high nut 41 inside the plate hole 20a, i.e., in the recessed portion, so as to surround the periphery of the screw hole 41a.

[0055] In the above embodiment, an example has been described in which the cushion ring 30 is placed on the base plate 20 in advance before the seismic isolation device 10 is placed on the base plate 20 and the filler 70, thereby arranging the cushion ring 30 so as to surround the periphery of the plate hole 20a. However, the present invention is not limited to this. For example, as shown in FIG. 6 , the cushion ring 30 may be bonded to the underside of the lower flange 14 of the seismic isolation device 10 so as to surround the periphery of the flange hole 14a. When the seismic isolation device 10 is placed on the base plate 20, the cushion ring 30 may be placed on the base plate 20 so as to surround the periphery of the plate hole 20a. In this case, the length of the cushion ring 30 is set so that the lower end of the filler 70 abuts against the base plate 20 before it reaches the screw hole 41a as it is crushed and expanded by the lower flange 14 of the seismic isolation device 10.

[0056] In this case, since the cushion ring 30 is adhered to the lower flange 14 of the seismic isolation device 10, the cushion ring 30 can be placed between the seismic isolation device 10 and the base plate 20 simply by placing the seismic isolation device 10 with the cushion ring 30 adhered thereto on the base plate 20.

[0057] The above-described embodiments are provided to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof.

[0058] In the above embodiment, the screw hole 41a is formed to penetrate the high nut 41, but this is not limiting. For example, the screw holes may be separated at the top and bottom of the high nut 41.

[0059] In the above embodiment, the threaded rod 43 has a male thread formed along its entire length, but this is not limited to this. For example, the threaded rod 43 may have a male thread formed only on both ends. Specifically, one end of the threaded rod 43 may have a male thread formed along the length of engagement between the high nut 41 and the nut 42, and the other end may have a male thread formed to sandwich the fixing plate 44 between the nuts 45 and 46 and fix it, including the excess length (the portion protruding downward from the nut 46). In other words, the portion of the threaded rod 43 between the nuts 42 and 45 may not have a male thread formed thereon.

[0060] In the above embodiment, the upper member is described as a seismic isolation device 10, but the upper member is not limited to a seismic isolation device and may be any member that is installed using the mortar grouting method, such as under a building steel frame base plate, between mechanical equipment and the foundation, etc. [Explanation of symbols]

[0061] 1 Substructure 10 Seismic isolation device (upper member) 12 Multilayer rubber 13 Upper flange 13a Flange hole 14 Lower flange 14a Flange hole (upper member hole) 16 Mounting bolts 20 Base plate (plate) 20a plate hole 20b Top surface of base plate 20c: A portion on the upper surface of the base plate where the cushion ring is placed 20d The area where the filler contacts the top surface of the base plate 20e Underside of base plate 21 Circular penetration 30 Cushion ring (cushion body) 40 Fixing agent 41 High Nut 41a Screw hole (connection hole) 42 Nut 43 Threaded Rod 44 Fixing plate 45,46 Nut 70 Filling material 100 Lead pin

Claims

1. The substructure and an annular plate having a plate hole penetrating in a thickness direction and installed on an upper surface of the lower structure; an upper member placed on the plate; a joining material that passes through the plate hole and joins the lower structure and the upper member; a filler material filled between the lower structure and the upper member inside the space surrounded by the plate; a fixing member that is embedded in the lower structure, has a connecting hole with a female thread for connecting the connecting material, and is fixed to the plate so that the plate hole and the connecting hole are positioned approximately concentrically; an annular cushion body placed around the joining hole and compressed by the pressure of the upper member; Equipped with An upper member installation structure characterized in that the cushion body is placed on a portion of the upper surface of the plate that is at the same height as the portion that contacts the filler, or inside the plate hole.

2. The upper member installation structure according to claim 1, An upper member installation structure characterized in that the upper end of the fixing material is joined to the lower surface of the plate.

3. The upper member installation structure according to claim 1, An upper member installation structure characterized in that the upper part of the fixing material is joined to the inner surface of the plate hole.

4. The upper member installation structure according to any one of claims 1 to 3, The upper member installation structure is characterized in that the cushion body is adhered to the upper member.

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