Seismic damping devices and buildings

Abstract

Improvement in the performance of seismic damping devices [Solution] The seismic damping device 200 includes a lower transmission member 203 comprising a bottom plate 203d1 positioned along the upper surface of the lower beam 102, reinforcing plates 203d4 and 203d5 welded onto the bottom plate 203d1, and arm plates 203d6 and 203d7 that rise from the reinforcing plates 203d4 and 203d5 along the sides of the columns 103 and 104 and are attached to the sides of the columns 103 and 104. The base members 204 and 205 comprise base portions 204a and 205a that extend along the lower surface of the lower beam 102 to below the columns 103 and 104, and shaft portions 204b and 205b welded to the base portions 204a and 205a and penetrating the lower beam 102, the bottom plate 203d1, and the reinforcing plates 203d4 and 203d5. Fasteners 206 and 207 fasten the base plate 203d1 and reinforcing plates 203d4 and 203d5 to the shaft portions 204b and 205b.

Description

Technical Field

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[0005]

[0001] The present invention relates to a seismic isolation device and a building.

Background Art

[0002] A seismic isolation device attached to a building is disclosed, for example, in Japanese Patent Application Laid-Open No. 2014-20113. In this publication, a structure is proposed in which a lower transmission member of a seismic isolation device disposed on a lower beam is fixed to an anchor bolt provided in a concrete foundation. Further, Japanese Patent Application Laid-Open No. 2014-109153 proposes fixing a seismic isolation device by a fixture attached to a lower beam and a column without using an anchor bolt.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, during an earthquake, displacement is applied to the seismic isolation device. At this time, the performance of the seismic isolation device improves as it is more firmly attached to the rectangular framework of the building. On the other hand, to directly fix the seismic isolation device with an anchor bolt, after the building foundation concrete is constructed, the position of the seismic isolation device cannot be changed with respect to the building, which may be inconvenient. The inventor of the present invention wants to improve the performance of such a seismic isolation device.

Means for Solving the Problems

[0005] The seismic damping device proposed here is a seismic damping device that is placed within a rectangular framework enclosed by the lower beam of a building, a pair of columns erected on the lower beam at predetermined intervals, and an upper beam spanning the pair of columns. The seismic damping device comprises a seismic damping unit, an upper transmission member, a lower transmission member, a base material, and fasteners. The seismic damping unit comprises a seismic damping member and a pair of displacement members that input relative displacement to the seismic damping member. The upper transmission member comprises an upper beam side fixing part fixed to the upper beam of the building and a first unit side fixing part fixed to one of the pair of displacement members of the seismic damping unit. The lower transmission member comprises a second unit side fixing part fixed to the other of the pair of displacement members of the seismic damping unit and a lower beam side fixing part fixed to the lower beam of the building. The lower beam side fixing part comprises a bottom plate positioned along the upper surface of the lower beam, a reinforcing plate welded onto the bottom plate, and an arm plate that rises from the reinforcing plate along the side of at least one of a pair of columns and is attached to the side of that column. The base material comprises a base portion that faces the bottom plate on the lower surface of the lower beam and extends along the lower surface of the lower beam to the bottom of at least one of a pair of columns that constitute a rectangular frame in which the lower transmission member is positioned, and a shaft portion welded to the base portion and penetrating the lower beam, bottom plate, and reinforcing plate. The fastener fastens the bottom plate and reinforcing plate to the shaft portion with the shaft portion penetrating the lower beam, bottom plate, and reinforcing plate. [Effects of the Invention]

[0006] Such seismic damping devices offer good workability during installation, can be securely attached to the rectangular framework of a building, and can exhibit high performance. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a front view of the seismic damping device 200 installed on building 100. [Figure 2] Figure 2 is a right side view of the seismic damping unit 201. [Figure 3] Figure 3 is a front view of the seismic damping unit 201. [Figure 4]Figure 4 is a front view of the upper transmission member 202. [Figure 5] Figure 5 is a bottom view of the upper transmission member 202. [Figure 6] Figure 6 is a front view of the lower transmission member 203. [Figure 7] Figure 7 is a plan view of the lower beam side fixing part 203d. [Figure 8] Figure 8 is a side view of the lower beam side fixing part 203d. [Figure 9] Figure 9 is a front view of the base material 204. [Figure 10] Figure 10 is a side view of the base material 204. [Figure 11] Figure 11 is an enlarged view of the area where the base material 204 is attached to the lower transmission member 203. [Figure 12] Figure 12 is a side view showing modified examples of base materials 204 and 205. [Modes for carrying out the invention]

[0008] The seismic damping device proposed herein will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. Each drawing is schematic and does not necessarily reflect the actual object. Furthermore, each drawing is merely an example and does not limit the present invention unless specifically mentioned. Also, components and parts that perform the same function are appropriately denoted by the same reference numerals, and redundant explanations are omitted. Here, in the figures, the directions up, down, left, right, front, and back are represented by the arrows U, D, L, R, F, and Rr, respectively.

[0009] Building 100 Figure 1 is a front view of a seismic damping device 200 installed on building 100. As shown in Figure 1, building 100 comprises a foundation 101, a lower beam 102, several columns 103, 104, and an upper beam 105.

[0010] The foundation 101 is equipped with anchor bolts 111 and 112 that protrude upward. The anchor bolts 111 and 112 should have the required pull-out strength. In addition to those shown in the diagram, the foundation 101 is also provided with several other anchor bolts besides the anchor bolts 111 and 112. The lower beams 102 and several columns of the building 100 are fixed at appropriate positions by several anchor bolts provided in the foundation 101.

[0011] The lower beam 102 is positioned on top of the foundation 101. Here, the lower beam 102 is a structural member of the lower part of the building 100, positioned on top of the foundation 101, and can also be called a sill. In Figure 1, a foundation packing 101a is placed on top of the foundation 101, and the lower beam 102 is placed on top of the foundation packing 101a. The components that make up the lower beam 102 can be changed in various ways depending on the construction method and design of the building 100. In this embodiment, a mortise 102a is formed in the lower beam 102.

[0012] Multiple columns 103 and 104 rise from the lower beam 102. In the configuration shown in Figure 1, tenons 103a and 104a are provided at the bottom of columns 103 and 104. The tenons 103a and 104a of columns 103 and 104 are inserted into mortise holes 102a formed in the lower beam 102. In this way, columns 103 and 104 rise from the lower beam 102. In the example shown in Figure 1, columns 103 and 104 are attached to anchor bolts 111 and 112 through hold-down hardware 111a and 112a. In addition, tenons 103b and 104b are provided at the top of columns 103 and 104 for attaching the upper beam 105. Here, Figure 1 only depicts a part of the building 100. In addition to columns 103 and 104, there are several other columns in the building 100. If the strength of the hold-down hardware 111a and 112a is too high, when the building 100 tilts significantly, the columns 103 and 104 may be damaged, making repairs difficult. For this reason, the strength of the hold-down hardware 111a and 112a should be adjusted to an appropriate level so that the necessary deformation occurs before the columns 103 and 104 are severely damaged.

[0013] In FIG. 1, the columns 103 and 104 are each joined to the anchor bolts 111 and 112 with the hold-down hardware 111a and 112a attached thereto. The joining of the columns 103 and 104 is not limited to such a form. For example, the pull-out force acting on the columns during the structural design of a house is calculated. And based on the result, the hardware to be attached to each column is determined. Based on the calculated result, the joining method is selected for each column. For example, when the pull-out force is large, the column is joined to the anchor bolt with the hold-down hardware attached. Also, when the pull-out force is not large, the column is fixed to the beam by corner hardware (also referred to as an L-shaped fitting). Regarding the wall to which the seismic isolation device 200 is attached, when the pull-out force is not large, the columns 103 and 104 may be fixed to the lower beam 102 by corner hardware (also referred to as an L-shaped fitting).

[0014] The upper beam 105 is supported by a plurality of columns 103 and 104 of the building 100 including such columns 103 and 104, and is disposed above the lower beam 102. In this embodiment, a mortise 105a is formed on the lower surface of the upper beam 105. The upper beam 105 is installed on the columns 103 and 104 by inserting the mortise 105a into the upper mortises 103b and 104b of the columns 103 and 104. The upper beam 105 and the columns 103 and 104 are fixed by hold-down hardware 113a and​​​​​​

[0016] "Vibration Damping Unit 201" Figure 2 is a right side view of the vibration damping unit 201. In Figure 2, the vibration damping unit 201 is shown as a cross-sectional view partially longitudinally cut along the center lines of the viscoelastic bodies 212 and 213. In Figure 2, the state where the vibration damping unit 201 is attached to the upper transmission member 202 and the lower transmission member 203 is shown. Figure 3 is a front view of the vibration damping unit 201. In Figure 2, the state where the vibration damping unit 201 is not attached to the upper transmission member 202 and the lower transmission member 203 is shown. The vibration damping unit 201 includes a vibration damping member and a pair of displacement members that input relative displacement to the vibration damping member.

[0017] In this embodiment, as shown in Figure 2, the vibration damping unit 201 includes an intermediate plate 211, a pair of viscoelastic bodies 212 and 213 as vibration damping members, and a pair of outer plates 214 and 215. The pair of viscoelastic bodies 212 and 213 are arranged so as to sandwich the intermediate plate 211 and are adhered to the intermediate plate 211. The pair of outer plates 214 and 215 are overlapped and adhered to the outer surfaces of the pair of viscoelastic bodies 212 and 213 arranged so as to sandwich the intermediate plate 211.

[0018] "Viscoelastic Bodies 212, 213" Viscoelastic materials 212 and 213 can preferably be made of viscoelastic rubber (vibration-damping rubber) with high damping properties. Examples of viscoelastic rubber (vibration-damping rubber) with high damping properties include natural rubber, styrene-butadiene rubber (SBR), nitrile-butadiene rubber (NBR), butadiene rubber material (BR), isoprene rubber (IR), butyl rubber (IIR), halogenated butyl rubber (X-IIR), chloroprene rubber (CR), or a rubber material made by mixing several of these rubber materials and adding an additive that exhibits high damping properties. Various additives are known to exhibit high damping properties, such as carbon black. The intermediate plate 211 and the viscoelastic materials 212 and 213, and the outer plates 214 and 215 and the viscoelastic materials 212 and 213 are preferably bonded by vulcanization adhesive.

[0019] In this seismic damping unit 201, when relative displacement occurs between the intermediate plate 211 and the pair of outer plates 214, 215, shear deformation occurs in the pair of viscoelastic bodies 212, 213. Then, a reaction force corresponding to the shear deformation of the pair of viscoelastic bodies 212, 213 acts on the intermediate plate 211 and the pair of outer plates 214, 215.

[0020] In this seismic damping unit 201, a pair of viscoelastic bodies 212 and 213 function as seismic damping members. The intermediate plate 211 and the pair of outer plates 214 and 215 function as a pair of displacement members for inputting relative displacement to the viscoelastic bodies 212 and 213. Here, a structure in which the seismic damping unit 201 is sandwiched between a pair of plates is disclosed, but the structure of the seismic damping unit 201 is not limited to this form.

[0021] In this embodiment, the seismic damping unit 201 is arranged within a rectangular frame 108 enclosed by a lower beam 102, columns 103, 104, and an upper beam 105, as shown in Figure 1. The normal directions of the intermediate plate 211, the pair of viscoelastic bodies 212, 213, and the pair of outer plates 214, 215 are aligned with the normal direction of the rectangular frame 108 enclosed by the lower beam 102, columns 103, 104, and upper beam 105. As shown in Figure 2, the intermediate plate 211 extends downward from the area where the pair of viscoelastic bodies 212, 213 are bonded. A mounting plate 211a is welded to the lower end of the intermediate plate 211 so as to be perpendicular to the intermediate plate 211. The mounting plate 211a has mounting holes formed therein for attachment to the lower transmission member 203. The pair of outer plates 214 and 215 extend to the left and right from the portion to which the pair of viscoelastic bodies 212 and 213 are bonded (see Figure 1). Mounting holes 214a and 215a are formed in the pair of outer plates 214 and 215 for attachment to the upper transmission member 202, as shown in Figure 3. The mounting holes 214a and 215a are elongated holes that are long from left to right, and two are formed vertically in the portions of the pair of outer plates 214 and 215 that extend to the left and right from the portion to which the pair of viscoelastic bodies 212 and 213 are bonded. Sheet-like friction material 214b and 215b may be attached around the mounting holes 214a and 215a on the opposing inner surfaces of the pair of outer plates 214 and 215. In Figure 3, a portion of the right side of the outer plate 214 on the near side is shown to be broken, exposing the sheet-like friction material 215b attached to the inner right side of the outer plate 215. Alternatively, instead of attaching the sheet-like friction material 214b and 215b, the area around the mounting holes 214a and 215a may be roughened as required. Various processing methods can be used for roughening the surface, such as laser processing.

[0022] Upper transmission member 202 Figure 4 is a front view of the upper transmission member 202. Figure 5 is a bottom view of the upper transmission member 202. In this embodiment, the upper transmission member 202 comprises an upper beam side fixing portion 202a and first unit side fixing portions 202b and 202c, as shown in Figures 4 and 5. The upper beam side fixing portion 202a is a long plate member with both edges in the width direction bent in the same direction. Mounting pieces that become the first unit side fixing portions 202b and 202c are welded to the upper beam side fixing portion 202a at predetermined intervals in the length direction. The upper beam side fixing portion 202a is the part that is fixed to the upper beam 105 of the building 100. In this embodiment, the upper beam side fixing portion 202a is attached along the lower surface of the upper beam 105 with mounting pieces that become the first unit side fixing portions 202b and 202c facing downward, as shown in Figure 1, and is fastened to the upper beam 105 by fasteners (screws 312 in this embodiment). The screws 312 are preferably attached to both the left and right sides of the upper beam side fixing portion 202a. Mounting holes 202a1 for attaching the screws 312 are preferably formed on both the left and right sides of the upper beam side fixing portion 202a, as shown in Figures 4 and 5.

[0023] The first unit-side fixing parts 202b and 202c are parts that are fixed to one of the pair of displacement members of the seismic damping unit 201 (in this embodiment, a pair of outer plates 214 and 215). Spacers 221a, 221b, 222a, and 222b of the required thickness corresponding to the viscoelastic bodies 212 and 213 are welded to both sides of the first unit-side fixing parts 202b and 202c, respectively. The spacers 221a, 221b, 222a, and 222b are preferably made of a metal with the required rigidity (for example, SUS304). The outer surfaces 221a1, 221b1, 222a1, and 222b1 of the spacers 221a, 221b, 222a, and 222b1 are roughened as required so that they function as friction materials. Furthermore, sheet-like friction material may be attached to the outer surfaces 221a1, 221b1, 222a, and 222b1 of the spacers 221a, 221b, 222a, and 222b1, respectively. The mounting pieces, which serve as the first unit side fixing parts 202b and 202c, have mounting holes formed for attachment to the pair of outer plates 214 and 215 of the seismic damping unit 201. In this embodiment, two elongated holes 202b1 and 202c1 are formed vertically.

[0024] These spacers 221a, 221b, 222a, and 222b maintain the spacing between the pair of outer plates 214 and 215 of the seismic damping unit 201. The pair of outer plates 214 and 215 and the mounting pieces 202b and 202c are fastened together by bolts and nuts 301 (see Figures 1 and 2) while overlapping via the spacers 221a, 221b, 222a, and 222b. Washers 301a and 301b are attached to the bolts and nuts 301. Although washers 301a and 301b are attached to the bolts and nuts 301 here, they are not required.

[0025] Lower transmission member 203 Figure 6 is a front view of the lower transmission member 203. As shown in Figure 6, the lower transmission member 203 comprises a second unit side fixing portion 203a, two braces 203b and 203c, and a lower beam side fixing portion 203d. The second unit side fixing portion 203a is the part that is fixed to the other displacement member of the pair of displacement members of the seismic damping unit 201 (in this embodiment, the intermediate plate 211). The two braces 203b and 203c extend from the second unit side fixing portion 203a so that the distance between them gradually increases. The lower beam side fixing portion 203d is provided at the ends of the two braces 203b and 203c, respectively.

[0026] In this embodiment, the second unit-side fixing portion 203a is provided at the upper ends of the two braces 203b and 203c, as shown in Figures 2 and 6. The second unit-side fixing portion 203a is a plate-shaped member bent to follow the upper ends and front and rear sides of the braces 203b and 203c. The second unit-side fixing portion 203a has a surface 203a1 facing the upper ends of the braces 203b and 203c, and surfaces 203a2 and 203a3 that sandwich the upper parts of the braces 203b and 203c from the front and rear. It is welded to the braces 203b and 203c in a state where it overlaps the upper parts of the braces 203b and 203c so as to cover the upper ends and the front and rear surfaces of the braces 203b and 203c. The surfaces 203a1 facing the upper ends of the braces 203b and 203c extend to the left and right. These surfaces 203a1 are superimposed on the mounting plate 211a provided on the intermediate plate 211 and fastened to the mounting plate 211a by bolts and nuts 302.

[0027] 《Two braces 203b, 203c》 The two braces 203b and 203c extend downward from the second unit side fixing part 203a. The distance between the two braces 203b and 203c widens to the left and right as they extend downward. A crossbar 203g is attached to the middle of the two braces 203b and 203c. In this embodiment, the crossbar 203g has a predetermined length and is welded to the middle of the two braces 203b and 203c. The distance between the two braces 203b and 203c is maintained by the crossbar 203g. The lower beam side fixing parts 203d and 203e are parts that are attached to the lower beam 102 and are provided at the lower ends of the two braces 203b and 203c.

[0028] 《Lower beam side fixed part 203d》 The lower beam side fixing portion 203d is the part that is fixed to the lower beam 102 of the building, as shown in Figure 1. In this embodiment, the lower beam side fixing portion 203d has a required length corresponding to the distance between the pair of columns 103 and 104. Figure 7 is a plan view of the lower beam side fixing portion 203d. Figure 8 is a side view of the lower beam side fixing portion 203d. Here, in Figures 7 and 8, the plan view of the lower beam side fixing portion 203d is shown with the two braces 203b and 203c not yet welded.

[0029] The lower beam side fixing section 203d comprises a bottom plate 203d1, side plate sections 203d2 and 203d3, reinforcing plates 203d4 and 203d5, and arm plates 203d6 and 203d7.

[0030] The base plate 203d1 is a member positioned along the upper surface of the lower beam 102. In this embodiment, the base plate 203d1 extends between a pair of columns 103 and 104 on the lower beam 102. The side plates 203d2 and 203d3 rise from the base plate 203d1 and are attached to the ends 203b1 and 203c1 of the braces 203b and 203c. In this embodiment, the side plates 203d2 and 203d3 rise from both the front and rear sides of the base plate 203d1 in the width direction of the lower beam 102, sandwiching the ends 203b1 and 203c1 of the braces 203b and 203c at the front and rear. The side plates 203d2 and 203d3 and the ends 203b1 and 203c1 of the braces 203b and 203c1 are welded to each other. The side plates 203d2 and 203d3 are raised where they sandwich the ends 203b1 and 203c1 of the braces 203b and 203c. The ends 203b1 and 203c1 of the braces 203b and 203c are sandwiched between these raised sections of the side plates 203d2 and 203d3, and a longer width is welded to them. This ensures the required welding strength.

[0031] The reinforcing plates 203d4 and 203d5 are plate-shaped members welded onto the base plate 203d1. In this embodiment, the first reinforcing plate 203d4 is positioned on the left side of the base plate 203d1, on the column 103 side. The second reinforcing plate 203d5 is positioned on the right side of the base plate 203d1, on the column 104 side. Here, it is preferable that the reinforcing plates 203d4 and 203d5 are welded on top of the base plate 203d1. Mounting holes 203e for attaching the base material 204 are formed in the reinforcing plates 203d4 and 203d5 and the base plate 203d1. The mounting holes 203e are formed as elongated holes, as shown in Figure 7. Here, the mounting holes 203e are positioned between the area where the lower ends of the two braces 203b and 203c are attached to the lower beam side fixing part 203d and the columns 103 and 104.

[0032] The arm plates 203d6 and 203d7 are plates that rise from the reinforcing plates 203d4 and 203d5 along the sides of the columns 103 and 104 and are attached to the sides of the columns 103 and 104. In this embodiment, the first arm plate 203d6 rises from the left reinforcing plate 203d4 along the side of the left column 103 and is attached to the side of the left column 103. The second arm plate 203d7 rises from the right reinforcing plate 203d5 along the side of the right column 104 and is attached to the side of the right column 104. The attachment of the arm plates 203d6 and 203d7 to the columns 103 and 104 is not particularly limited, but it is preferable that they be firmly fixed to the columns 103 and 104 by screws 314 (see Figure 11). The arm plates 203d6 and 203d7 may be provided with the required number of bolt holes. In this embodiment, the reinforcing plates 203d4, 203d5 and the arm plates 203d6, 203d7 are formed by bending a single plate. The arm plates 203d6, 203d7 are integrated with the base plate 203d1 by welding the reinforcing plates 203d4, 203d5 to the base plate 203d1.

[0033] The lower beam side fixing portion 203d is not limited to this form unless otherwise specified, and may consist of two members attached to the ends of the two braces 203b and 203c, respectively. The reinforcing plates 203d4 and 203d5 and the arm plates 203d6 and 203d7 may be a single plate welded together.

[0034] Base material 204, 205 Figure 9 is a front view of the base member 204. Figure 10 is a side view of the base member 204. The base member 204 is a member for fixing the bottom plate 203d1 of the lower transmission member 203 to the lower beam 102. In this embodiment, the base members 204 and 205 are attached to the bottom plate 203d1 of the lower transmission member 203 on the left and right sides, respectively, as shown in Figure 1. Figures 9 and 10 show the left base member 204. The right base member 205 has the same structure as the left base member 204. In Figures 9 and 10, the corresponding reference numerals for the right base member 205 are indicated in parentheses. As shown in Figures 1, 9, and 10, the base members 204 and 205 comprise base portions 204a and 205a and shaft portions 204b and 205b.

[0035] As shown in Figure 1, the base portion 204a of the base material 204 attached to the left side extends from a position opposite the bottom plate 203d1 of the lower transmission member 203 to below the left column 103 of the rectangular frame 108, on the left side of the bottom plate 203d1 of the lower transmission member 203. The base portion 205a of the base material 205 attached to the right side extends from a position opposite the bottom plate 203d1 of the lower transmission member 203 to below the right column 104 of the rectangular frame 108, on the right side of the bottom plate 203d1 of the lower transmission member 203. Thus, the base portions 204a and 205a are portions that are on the lower surface of the lower beam 102, opposite the bottom plate 203d1 of the lower transmission member 203, and extend along the lower surface of the lower beam 102 to below at least one of the columns 103 and 104.

[0036] In this embodiment, the base portions 204a and 205a of the base materials 204 and 205 are provided with support plates 204a1 and 205a1 that extend along the lower surface of the lower beam 102. Furthermore, as shown in Figure 10, the base portions 204a and 205a are provided with side plates 204a2, 204a3, 205a2, and 205a3 that rise from the support plates 204a1 and 205a1 along the front and rear sides of the lower beam 102, respectively. As a result, the base portions 204a and 205a of the base materials 204 and 205 are less likely to shift forward or backward from the lower beam 102 and are firmly attached to the lower beam 102. It is preferable that a step 102b is provided on the lower surface of the lower beam 102 into which the support plates 204a1 and 205a1 of the base materials 204 and 205 fit.

[0037] The shafts 204b and 205b are welded to the bases 204a and 205a, as shown in Figure 1. The shafts 204b and 205b have the required length to penetrate the lower beam 102, bottom plate 203d1, and reinforcing plate 203d4, which are mounted on top of the bases 204a and 205a.

[0038] In this embodiment, the base portions 204a and 205a have holes 204a4 and 205a4 formed therein for inserting the shaft portions 204b and 205b, as shown in Figures 9 and 10. The holes 204a4 and 205a4 are threaded with female threads. The shaft portions 204b and 205b are threaded with male threads in the portion that is inserted into the base portions 204a and 205a. The male threads of the shaft portions 204b and 205b are then assembled with the female threads of the base portions 204a and 205a. The shaft portions 204b and 205b are then welded to the base portions 204a and 205a with the shaft portions 204b and 205b positioned above the base portions 204a and 205a so that the peaks of the male threads and the female threads are aligned vertically. For example, the base ends of the shafts 204b and 205b, which are fitted into the holes 204a4 and 205a4 of the base parts 204a and 205a, are welded. With this structure, even if the shafts 204b and 205b are pulled upward relative to the base parts 204a and 205a, the male threads and female threads are in contact vertically, so the force is not concentrated at the welded parts 204c and 205c, and the shafts 204b and 205b are not easily pulled out. Here, it is preferable that the step 102b formed on the lower surface of the lower beam 102 into which the support plates 204a1 and 205a1 of the base materials 204 and 205 are fitted has recesses 102c into which the welded parts 204c and 205c fit so that the welded parts 204c and 205c do not interfere with each other.

[0039] Unless otherwise specified, the joining structure between the base portions 204a, 205a and the shaft portions 204b, 205b is not limited to the above. For example, flanges may be provided at the lower ends of the shaft portions 204b, 205b, and the shaft portions 204b, 205b may be inserted from below through holes formed in the base portions 204a, 205a, and the flange portions may be welded. Also, if the lower ends of the shaft portions 204b, 205b protrude below the base portions 204a, 205a, the base packing 101a may be configured to allow the installation of the base materials 204, 205 by providing recesses or the like. In this way, the joining structure between the base portions 204a, 205a and the shaft portions 204b, 205b is a structure that can obtain the required load-bearing capacity, and various configurations can be adopted.

[0040] Figure 11 is an enlarged view of the portion where the base material 204 is attached to the lower transmission member 203. In this embodiment, as shown in Figure 11, a step 102b is provided on the lower surface of the lower beam 102 into which the support plate 204a1 of the base portion 204a fits. As shown in Figure 7, the lower transmission member 203 has mounting holes 203e through which the shaft portions 204b and 205b are inserted, between the portion where the lower ends of two braces 203b and 203c are attached to the lower beam side fixing portion 203d and the columns 103 and 104. Furthermore, the lower beam 102 has through holes 102d (see Figure 10) through which the shaft portions 204b and 205b are inserted. Also, the mortise hole 102a formed in the lower beam 102 penetrates the lower beam 102 vertically. The tenons 103a and 104a of columns 103 and 104 are inserted into the mortise holes 102a and reach the support plate 204a1 of the base portion 204a of the base material 204 and 205. In this way, the tenons 103a and 104a of columns 103 and 104 are fitted into the mortise holes 102a formed to penetrate the lower beam 102 of the building 100. Furthermore, it is desirable that the tenons 103a and 104a of columns 103 and 104 are in contact with the base portions 204a and 205a of the base material 204 and 205.

[0041] With this structure, even if the shaft portions 204b and 205b of the base materials 204 and 205 are pulled upward, the tenons 103a and 104a of the columns 103 and 104 are in contact with the base portions 204a and 205a, making it difficult for the base materials 204 and 205 to lift up. Furthermore, the bottom plate 203d1 of the lower transmission member 203 is preferably fastened to the floor plywood 109 and the lower beam 102 with screws 316. Also, in the configuration shown in Figure 1, the pair of columns 103 and 104 of the rectangular frame 108 to which the seismic damping device 200 is attached are fixed via anchor bolts 111 and 112. This prevents the tenons 103a and 104a of the pair of columns 103 and 104 from coming out of the mortise 102a of the lower beam 102. Here, the screws 316 may be bolts, lag screws, or screws. The same applies to screws 312 and 314 mentioned above.

[0042] The fasteners 206 and 207 are components that fasten the shaft portions 204b and 205b of the left and right base materials 204 and 205 to the bottom plate 203d1 and the reinforcing plates 203d4 and 203d5, with the shaft portions 204b and 205b of the left and right base materials 204 and 205 passing through the lower beam 102, the bottom plate 203d1, and the reinforcing plates 203d4 and 203d5. In this embodiment, the shaft portions 204b and 205b are made of bolts. The fasteners 206 and 207 include lower nuts 206a and 207a that are attached to the lower surface of the bottom plate 203d1 and upper nuts 206b and 207b that are attached to the top of the reinforcing plates 203d4 and 203d5. Here, it is preferable that the floor plywood 109, which is placed between the lower beam 102 and the bottom plate 203d1, has a counterbore 109a (see Figure 11) formed in it so that the lower nuts 206a and 207a do not interfere with it.

[0043] During an earthquake, a relative horizontal displacement occurs between the lower beam 102 and the upper beam 105. Accordingly, a relative horizontal displacement occurs between the upper transmission member 202 and the lower transmission member 203. Due to this relative horizontal displacement, a relative horizontal displacement occurs between the intermediate plate 211 and the pair of outer plates 214 and 215 of the seismic damping unit 201 of the seismic damping device 200, causing shear deformation in the viscoelastic bodies 212 and 213. A reaction force corresponding to the shear deformation of the pair of viscoelastic bodies 212 and 213 acts on the lower beam side fixing part 203d through the braces 203b and 203c. At the lower beam side fixing part 203d, forces pulling the shaft portions 204b and 205b of the base members 204 and 205 upward and forces pushing them downward act alternately on the left and right sides of the bottom plate 203d1. These forces increase as the seismic energy increases.

[0044] In this embodiment, the base plate 203d1 includes a first reinforcing plate 203d4 positioned on the left side of the column 103 and a second reinforcing plate 203d5 positioned on the right side of the column 104. The first arm plate 203d6 rises from the first reinforcing plate 203d4 along the side of the left column 103 and is attached to the side of the left column 103. The second arm plate 203d7 rises from the second reinforcing plate 203d5 along the side of the right column 104 and is attached to the side of the right column 104.

[0045] In this configuration, the seismic damping device 200 is not directly fixed to the anchor bolts. Therefore, the seismic damping device 200 can be attached to the building 100 after the foundation has been constructed, regardless of the position of the anchor bolts. This improves workability during construction. Furthermore, the force that would cause the bottom plate 203d1 of the lower transmission member 203 to lift up during an earthquake is supported by the base materials 204, 205 and fasteners 206, 207 described above. In addition, the force that would cause the bottom plate 203d1 to lift up is transmitted to the columns 103, 104 by the reinforcing plates 203d4, 203d5 and arm plates 203d6, 203d7 which are integrally formed with the bottom plate 203d1. As a result, the bottom plate 203d1 is firmly fixed to the lower beam 102. In this way, the seismic damping device 200 is firmly attached to the rectangular frame 108 of the building 100. Therefore, the shaking that occurs in the building 100 during an earthquake can be reduced and attenuated quickly. Thus, the seismic damping device 200 is easy to install, can be firmly attached to the rectangular frame 108 of the building 100, and can exhibit high performance.

[0046] In other words, because the seismic damping device 200 is firmly attached to the rectangular frame 108 of the building 100, appropriate displacement occurs in the intermediate plate 211 and the pair of outer plates 214 and 215 of the seismic damping unit 201 during an earthquake. In response to the displacement occurring in the intermediate plate 211 and the pair of outer plates 214 and 215, shear deformation occurs in the viscoelastic bodies 212 and 213, causing the seismic damping unit 201 to function and absorbing the energy that would cause the building 100 to vibrate. As a result, the shaking that occurs in the building 100 is reduced and the shaking is attenuated quickly.

[0047] In this embodiment, the bottom plate 203d1 of the lower transmission member 203 extends between a pair of columns 103 and 104 on the lower beam 102. The reinforcing plates 203d4, 203d5 and arm plates 203d6, 203d7 are integrally formed on the left and right sides of the bottom plate 203d1. As a result, the lower transmission member 203 as a whole has high rigidity. In particular, the rigidity is high on the left and right sides of the bottom plate 203d1, and it exhibits the required resistance against forces that would cause the bottom plate 203d1 to lift up. Furthermore, since the bottom plate 203d1 of the lower transmission member 203, the reinforcing plates 203d4, 203d5, and the arm plates 203d6, 203d7 are integrated, it is easy to attach them to the rectangular frame 108 of the building 100.

[0048] Furthermore, since the lower nuts 206a and 207a are attached to the shafts 204b and 205b below the base plate 203d1, a force acts on the shafts 204b and 205b to push down on the base plate 203d1, thereby supporting it. Also, any pulling force on the shafts 204b and 205b is exerted by the upper nuts 206b and 207b, which act on the shafts 204b and 205 of the base materials 204 and 205. Here, it is preferable that the lower nuts 206a and 207a are flanged nuts with a flange on the top. This allows the lower nuts 206a and 207a to stably support the base plate 203d1. It is also preferable that the upper nuts 206b and 207b are double nuts. This allows the base plate 203d1 and the reinforcing plates 203d4 and 203d5 to be stably supported. Alternatively, instead of using the lower nuts 206a and 207a, or in combination with the lower nuts 206a and 207a, screws may be embedded in the floor plywood 109 and the lower beam 102 where the bottom plate 203d1 is attached. Embedding screws in the floor plywood 109 and the lower beam 102 also prevents the bottom plate 203d1 from sinking into the floor plywood 109 and the lower beam 102.

[0049] In this embodiment, the lower transmission member 203 extends from the second unit side fixing portion 203a so as to gradually increase in distance from each other and is equipped with two braces 203b and 203c connected to the lower beam side fixing portion 203d. In this configuration, during an earthquake, an upward pulling force acts on the seismic damping unit 201 along the two braces 203b and 203c connected to the lower beam side fixing portion 203d, alternately lifting the lower beam side fixing portion 203d away from the lower beam 102. In this embodiment, as described above, in the lower beam side fixing portion 203d, reinforcing plates 203d4, 203d5 and arm plates 203d6, 203d7 are integrally formed with the base plate 203d1. Furthermore, the base plate 203d1 is fixed to the shaft portions 204b and 205b of the base materials 204 and 205 attached to the lower surface of the lower beam 102. The base members 204 and 205 extend down to the columns 103 and 104. Therefore, against the force that would cause the bottom plate 203d1 to lift up, the force is transmitted to the columns 103 and 104 by the reinforcing plates 203d4, 203d5 and arm plates 203d6, 203d7, which are integrally formed with the bottom plate 203d1 at the lower beam side fixing part 203d, and also by the base members 204 and 205, which are positioned along the lower surface of the lower beam 102 and extend down to the columns 103 and 104. As a result, the bottom plate 203d1 is firmly fixed to the lower beam 102 and is not easily lifted up. In this way, even when the lower transmission member 203 extends from the second unit side fixing part 203a so that the distance between them gradually increases and is equipped with two braces 203b and 203c connected to the lower beam side fixing part 203d, the seismic damping device 200 can exhibit high performance.

[0050] In this embodiment, the shaft portions 204b and 205b of the base members 204 and 205 are further positioned between the portion where the lower ends of the two braces 203b and 203c are attached to the lower beam side fixing portion 203d, and the columns 103 and 104. Therefore, even when a force acts to lift the bottom plate 203d1 through the two braces 203b and 203c, a reaction force can be generated outside the braces 203b and 203c through the shaft portions 204b and 205b. Here, the lower transmission member 203 is described as having a structure with such two braces 203b and 203c, but the lower transmission member 203 is not limited to a structure with such two braces 203b and 203c, and various structures can be adopted.

[0051] In this embodiment, the base members 204 and 205 are attached to the bottom plate 203d1 of the lower transmission member 203 on the left and right sides, respectively, but the embodiment is not limited to this configuration. The left and right base members 204 and 205 may be composed of a single member in which the base portions 204a and 205a are connected in the longitudinal direction. In this embodiment, the base members 204 and 205 are separated into left and right sides. The base members 204 and 205 are placed on the foundation 101 and, if necessary, on the foundation packing, at predetermined planned positions where the columns 103 and 104 are placed on the left and right sides together with the lower beam 102. Then, the columns 103 and 104 are attached to the lower beam 102 to form a rectangular frame 108. Subsequently, when the lower transmission member 203 is placed on the lower beam 102 within the rectangular frame 108, the lower transmission member 203 is attached to the shaft portions 204b and 205b of the base members 204 and 205. In this case, the base materials 204 and 205 are attached to the lower beam 102 on the left and right sides, respectively. Since the base materials 204 and 205 are separated into left and right halves, they can be made into smaller individual components, thus keeping the manufacturing cost of each base material 204 and 205 low. Also, because the base materials 204 and 205 are separated into left and right halves, the individual base materials 204 and 205 are easy to handle. Furthermore, for example, the shaft portions 204b and 205b of the left and right base materials 204 and 205 can be attached to the lower beam 102 in accordance with the position of the insertion hole 102d (see Figure 10) formed in the lower beam 102. Thus, when the base materials 204 and 205 are separated into left and right halves, not only are manufacturing costs kept low, but the position of the insertion hole 102d (see Figure 10) formed in the lower beam 102 has greater flexibility, resulting in better workability during on-site construction.

[0052] In the configuration shown in Figure 1, the side plates 204a2, 204a3, 205a2, and 205a3 of the base material 204 are provided on the front and back of the support plates 204a1 and 205a1, respectively, as shown in Figure 10. The structure of the base material 204 is not limited to this configuration. For example, the side plates 204a2, 204a3, 205a2, and 205a3 may be provided on only one of the front or back of the support plates 204a1 and 205a1. Furthermore, the side plates 204a2, 204a3, 205a2, and 205a3 have the effect of suppressing deformation (bending) of the base portions 204a and 205a. Instead of providing the side plates 204a2, 204a3, 205a2, and 205a3 on the base portions 204a and 205a, ribs may be provided. For example, ribs or side plates may be provided on the underside of the base portions 204a and 205a so as to sandwich the front and rear sides of the foundation 101 or the foundation packing 101a.

[0053] Furthermore, as shown in Figure 12, the base materials 204 and 205 do not necessarily have side plates 204a2, 204a3, 205a2, 205a3 (see Figure 10) on the front and back of the support plates 204a1, 205a1. Here, Figure 12 is a side view showing a modified example of the base materials 204 and 205. In this case, it is desirable that the support plates 204a1, 205a1 have the required rigidity so as not to deform significantly even when the shaft portions 204b, 205b are pulled. For example, it is desirable that the support plates 204a1, 205a1 have the required thickness. If the base materials 204 and 205 do not have side plates 204a2, 204a3, 205a2, 205a3 on the front and back of the support plates 204a1, 205a1, the manufacturing cost of the base materials 204 and 205 can be kept low. Furthermore, the work of installing the base materials 204 and 205 under the lower beam 102 becomes easier. The base material 204 can be temporarily fixed by passing the shaft portions 204b and 205b through the insertion holes 102d formed in the lower beam 102, and then placed together with the lower beam 102 on the foundation 101 and foundation packing 101a (see Figures 1 and 11). As shown in Figure 12, if side plates 204a2, 204a3, 205a2, and 205a3 are not provided in front of and behind the support plates 204a1 and 205a1, the prepared base materials 204 and 205 can be attached regardless of the width of the lower beam 102 constructed on site, thus increasing versatility.

[0054] The seismic damping device 200 comprises a seismic damping unit 201, an upper transmission member 202, and a lower transmission member 203. The seismic damping unit 201 comprises a seismic damping member and a pair of displacement members that input relative displacement to the seismic damping member. In the embodiment shown in Figure 1, as described above, the pair of viscoelastic bodies 212 and 213 function as seismic damping members. The intermediate plate 211 and the pair of outer plates 214 and 215 function as a pair of displacement members for inputting relative displacement to the viscoelastic bodies 212 and 213. Here, the viscoelastic bodies 212 and 213 are sandwiched between the pair of plates acting as a pair of displacement members. The structure of the seismic damping unit 201 is not limited to this embodiment. The seismic damping unit 201 may also have a cylinder structure, such as a hydraulic cylinder. Thus, the structure of the seismic damping unit 201 and the structure for attaching the lower transmission member 203 of the seismic damping device 200 to the lower beam 102 are not limited to the embodiments described above unless otherwise specified.

[0055] Although various aspects of the disclosure described herein have been explained, the disclosure is not limited to the embodiments and modifications described herein unless otherwise specified. Furthermore, the various embodiments and modifications described herein can be combined as appropriate, provided that they do not interfere with one another.

[0056] As described above, this specification includes the disclosures set forth in the following sections.

[0057] Section 1: A seismic damping device is positioned within a rectangular framework enclosed by a lower beam of a building, a pair of columns erected on the lower beam at predetermined intervals, and an upper beam spanning the pair of columns, Seismic damping unit, Upper transmission member and Lower transmission member and Base material and Fasteners and Equipped with, The aforementioned seismic damping unit is Seismic damping components, A pair of displacement members that input relative displacement to the seismic damping member, Equipped with, The upper transmission member is, An upper beam side fixing part that is fixed to the upper beam of the aforementioned building, A first unit side fixing portion fixed to one of the pair of displacement members of the seismic damping unit and Equipped with, The lower transmission member is, A second unit-side fixing portion is fixed to the other displacement member of the pair of displacement members of the seismic damping unit, A lower beam side fixing part that is fixed to the lower beam of the aforementioned building and Equipped with, The lower beam side fixing part is A bottom plate arranged along the upper surface of the lower beam, A reinforcing plate welded onto the aforementioned base plate, From the reinforcing plate, an arm plate rises along the side of at least one of the pair of columns and is attached to the side of the column. Equipped with, The aforementioned base material is The base portion extends along the lower surface of the lower beam, facing the bottom plate, and along the lower surface of the lower beam, down to the bottom of at least one of the pair of columns that constitute the rectangular frame in which the lower transmission member is arranged, A shaft portion is welded to the base portion and penetrates the lower beam, the bottom plate, and the reinforcing plate. Equipped with, The fastener is, With the shaft portion penetrating the lower beam, the bottom plate, and the reinforcing plate, the bottom plate and the reinforcing plate are fastened together with the shaft portion. Seismic damping device.

[0058] Section 2: The aforementioned shaft portion is a bolt, The seismic damping device according to item 1, wherein the fastener comprises a lower nut attached to the lower surface of the bottom plate and an upper nut attached to the reinforcing plate.

[0059] Section 3: The lower nut is a flanged nut with a flange on top, as described in item 2, for the seismic damping device.

[0060] Section 4: The upper nut is a double nut, as described in item 2 of the seismic damping device.

[0061] Section 5: The base portion has a female thread cut into the hole through which the shaft portion is inserted, and the shaft portion has a male thread cut into the portion that is inserted into the base portion, and, The seismic damping device according to item 1, wherein the male screw and the female screw are assembled, and the shaft portion and the base portion are welded together with respect to the base portion in an upward position, such that the male screw and the female screw are in contact vertically.

[0062] Item 6: The base plate extends between the pair of columns on the lower beam, The aforementioned reinforcing plate is On the base plate, a first reinforcing plate is positioned on the side of the first of the pair of columns, On the aforementioned base plate, a second reinforcing plate is positioned on the second column side and Equipped with, The aforementioned arm plate is A first arm plate rises from the first reinforcing plate along the side of the first column and is attached to the side of the first column, A second arm plate rises from the second reinforcing plate along the side of the second column and is attached to the side of the second column. Equipped with, The seismic damping device described in item 1.

[0063] Section 7: The seismic damping device according to item 1, wherein the lower transmission member extends from the second unit side fixing portion so as to gradually increase in distance from each other and comprises two braces connected to the lower beam side fixing portion.

[0064] Section 8: The aforementioned shaft portion is positioned between the portion where the lower ends of the two braces are attached to the lower beam side fixing portion and the column, as described in item 7.

[0065] Section 9: The base portion of the aforementioned base material is A support plate extending along the lower surface of the lower beam, A first side plate rises from the support plate along the first side of the lower beam, A second side plate rising along the second side of the lower beam, A seismic damping device as described in item 1, which has the following characteristics.

[0066] Section 10: The frame has a rectangular structure enclosed by a lower beam, a pair of columns erected on the lower beam at predetermined intervals, and an upper beam spanning the pair of columns, and the seismic damping device described in claim 1 is attached to the rectangular frame. The tenon of the column is fitted into a mortise formed to penetrate the lower beam, and the configuration is such that the tenon of the column contacts the base portion of the base material. building. [Explanation of Symbols]

[0067] 100 buildings 101 Basics 101a Foundation packing 102 Lower beam 102a Mortise 102b Step 102c dent 102d Through hole 103,104 pillars 105 Upper beam 105a Mortise 108 Rectangular frame 109 Floor plywood 111,112 Anchor bolts 111a, 112a Hold-down hardware 113a, 113b Hold-down hardware 200 seismic damping devices 201 Seismic damping unit 202 Upper transmission member 202a Upper beam side fixed part 202a1 Mounting holes 202b, 202c Mounting piece 202b1,202c1 long hole 203 Lower transmission member 203a1 Surface facing the upper end of the brace 203a2, 203a3 Surfaces that sandwich the upper part of the brace from front to back. 203b, 203c braces 203b1, 203c1 End of brace 203d Lower beam side fixed part 203d,203e Lower beam side fixed part 203d1 Bottom plate 203d2,203d3 Side plate part 203d4, 203d5 Reinforcement Plate 203d6, 203d7 Arm Plate 203e Mounting Holes 203g horizontal bar 204,205 Base material 204a, 205a Base section 204a1 Support plate 204a1,205a1 Support plate 204a2,204a3,205a2,205a3 Side plate 204a4, 205a4 Holes for inserting the shaft portion 204b,205b Shaft part 204c, 205c welded area 206,207 Fasteners 206a, 207a Lower nut 206b, 207b Upper Nut 211 Intermediate plate 211a Mounting plate 212,213 Viscoelastic material 214,215 Outer plate 214a, 215a Mounting holes 214b,215b Friction material 221a, 221b, 222a, 222b Spacer 221a1, 221b1, 222a1, 222b1 Outer surface of spacer 301 Bolts and nuts 301a, 301b Washers 302 Bolts and nuts 312, 314, 316 screws

Claims

1. A seismic damping device is positioned within a rectangular framework enclosed by a lower beam of a building, a pair of columns erected on the lower beam at predetermined intervals, and an upper beam spanning the pair of columns, Seismic damping unit, Upper transmission member and Lower transmission member and Base material and Fasteners and Equipped with, The aforementioned seismic damping unit is Seismic damping components, A pair of displacement members that input relative displacement to the seismic damping member, Equipped with, The upper transmission member is, An upper beam side fixing part that is fixed to the upper beam of the aforementioned building, A first unit side fixing portion fixed to one of the pair of displacement members of the seismic damping unit and Equipped with, The lower transmission member is, A second unit-side fixing portion is fixed to the other displacement member of the pair of displacement members of the seismic damping unit, A lower beam side fixing part that is fixed to the lower beam of the aforementioned building and Equipped with, The lower beam side fixing part is A bottom plate arranged along the upper surface of the lower beam, A reinforcing plate welded onto the aforementioned base plate, From the reinforcing plate, an arm plate rises along the side of at least one of the pair of columns and is attached to the side of the column. Equipped with, The aforementioned base material is The base portion extends along the lower surface of the lower beam, facing the bottom plate, and along the lower surface of the lower beam, down to the bottom of at least one of the pair of columns that constitute the rectangular frame in which the lower transmission member is arranged, A shaft portion is welded to the base portion and penetrates the lower beam, the bottom plate, and the reinforcing plate. Equipped with, The fastener is, With the shaft portion penetrating the lower beam, the bottom plate, and the reinforcing plate, the bottom plate and the reinforcing plate are fastened together with the shaft portion. Seismic damping device.

2. The aforementioned shaft portion is a bolt, The seismic damping device according to claim 1, wherein the fastener comprises a lower nut attached to the lower surface of the bottom plate and an upper nut attached to the reinforcing plate.

3. The seismic damping device according to claim 2, wherein the lower nut is a flanged nut with a flange on its upper part.

4. The vibration damping device according to claim 2, wherein the upper nut is a double nut.

5. The base portion has a female thread cut into the hole through which the shaft portion is inserted, and the shaft portion has a male thread cut into the portion that is inserted into the base portion, and, The vibration damping device according to claim 1, wherein the male screw and the female screw are assembled, and the shaft portion and the base portion are welded together with respect to the base portion in an upward position, such that the male screw and the female screw are in contact vertically.

6. The base plate extends between the pair of columns on the lower beam, The aforementioned reinforcing plate is On the base plate, a first reinforcing plate is positioned on the side of the first of the pair of columns, On the aforementioned base plate, a second reinforcing plate is positioned on the second column side and Equipped with, The aforementioned arm plate is A first arm plate rises from the first reinforcing plate along the side of the first column and is attached to the side of the first column, A second arm plate rises from the second reinforcing plate along the side of the second column and is attached to the side of the second column. Equipped with, A seismic damping device as described in claim 1.

7. The seismic damping device according to claim 1, wherein the lower transmission member extends from the second unit side fixing portion such that the distance between them gradually increases and is connected to the lower beam side fixing portion, comprising two braces.

8. The seismic damping device according to claim 7, wherein the shaft portion is positioned between the portion where the lower ends of the two braces are attached to the lower beam side fixing portion and the column.

9. The base portion of the aforementioned base material is A support plate extending along the lower surface of the lower beam, A first side plate rises from the support plate along the first side of the lower beam, A second side plate rising along the second side of the lower beam, A seismic damping device according to claim 1, having the following features.

10. The structure has a rectangular frame enclosed by a lower beam, a pair of columns erected on the lower beam at predetermined intervals, and an upper beam spanning the pair of columns, and the seismic damping device described in claim 1 is attached to the rectangular frame. The tenon of the column is fitted into a mortise formed to penetrate the lower beam, and the configuration is such that the tenon of the column contacts the base portion of the base material. building.

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