Seismic isolation renovation method using seismic isolation packing under the foundation of wooden buildings

Abstract

This method provides seismic isolation functionality to existing buildings without requiring the removal of existing packing or other modifications. [Solution] A method for renovating a building to be renovated, which provides seismic isolation functionality to the building, comprising the steps of: removing an existing nut screwed onto an anchor bolt; securing a predetermined insertion clearance between an existing packing and a foundation; widening a through hole in the foundation to secure a predetermined seismic isolation clearance between the inner surface of the through hole and the anchor bolt; inserting a seismic isolation packing configured to slide against the foundation during an earthquake between the existing packing and the foundation; and screwing an existing nut or a new nut onto an anchor bolt.

Description

Technical Field

[0001] The present invention relates to a seismic reform method using seismic isolation packing under a foundation in a wooden building.

Background Art

[0002] An anchor bolt for fixing a foundation embedded in a building foundation, a through hole through which the anchor bolt is inserted and penetrates the foundation vertically, a nut screwed onto the upper end side of the anchor bolt, and a friction damping device interposed between the foundation and the foundation. A seismic isolation mechanism of an anchor bolt and a friction damping device is known (see Patent Document 1). The friction damping device has a first sliding plate located in the upper stage and in close contact with the foundation, and a second sliding plate located in the lower stage and in close contact with the foundation. The surfaces where the first sliding plate and the second sliding plate are overlapped are smooth. In this seismic isolation mechanism, the friction damping device functions as an isolator whose smooth portion becomes a sliding surface and slides during an earthquake. A large number of small seismic isolation devices having the bending stress of the anchor bolt as a spring operate to bring a large seismic isolation effect.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, the technique described in Patent Document 1 basically targets new buildings. Existing buildings have limitations in the allowable stresses of wooden columns, beams, etc. When an earthquake with an acceleration exceeding 1G assumed in the Building Standards Law implemented in 1981 arrives, the building may collapse. Therefore, in preparation for the arrival of an earthquake, it is desirable to apply the technique described in Patent Document 1 to existing buildings. However, in approximately 80% of existing houses, a pre-existing plastic gasket is interposed between the foundation and the base as a base plate. If the friction seismic damping device described in Patent Document 1 were to be installed in such buildings, the labor and costs involved in dismantling and removing the existing gasket would be enormous. The inventors of the present invention have been diligently investigating whether it is possible to provide seismic isolation functionality to such existing buildings without removing the existing gasket.

[0005] The present invention aims to provide a seismic isolation renovation method for wooden buildings using seismic isolation packing under the foundation, which can impart seismic isolation functionality without removing existing packing. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides: A foundation made of concrete, A base made of wood, The existing packing interposed between the foundation and the base, An anchor bolt extending upward from the aforementioned foundation, The base has a through hole formed therein through which the anchor bolt is inserted, A method for renovating a building to be renovated, which provides seismic isolation functionality to an existing nut that screws into the aforementioned anchor bolt, The process of removing the existing nut, An insertion clearance securing step is performed to secure a predetermined insertion clearance between the existing packing and the base, A seismic isolation clearance securing step, which involves widening the through-hole in the base to secure a predetermined seismic isolation clearance between the inner circumferential surface of the through-hole and the anchor bolt, A seismic isolation packing insertion step involves inserting a seismic isolation packing, configured to slide against the base during an earthquake, between the existing packing and the base, where the aforementioned insertion clearance has been secured. A method for seismic isolation renovation using seismic isolation packing under the foundation of a wooden building is provided, which includes a nut installation step of screwing the existing nut or a new nut onto the anchor bolt while the seismic isolation packing is inserted between the existing packing and the foundation.

[0007] In the above-mentioned seismic isolation renovation method, In the insertion clearance securing step, a wedge packing having an insertion portion with a thickness corresponding to the insertion clearance is inserted between the existing packing and the base. It is preferable to include a wedge packing removal step after the seismic isolation packing insertion step, in which the wedge packing is removed from between the foundation packing and the base.

[0008] In the above-mentioned seismic isolation renovation method, The seismic isolation packing is formed in a flat plate shape and has a position adjustment groove into which a tool can be inserted when it is inserted into the existing packing and the base. It is preferable to include a seismic isolation packing position adjustment step after the seismic isolation packing insertion step, in which a tool is inserted into the position adjustment groove to adjust the position of the seismic isolation packing.

[0009] In the above-mentioned seismic isolation renovation method, In the nut attachment process, the upper end of the anchor bolt can be restrained to the base by using a nut having a long nut portion that screws into the anchor bolt and a round base that contacts the base.

[0010] In the above-mentioned seismic isolation renovation method, In the nut installation process, it is preferable to embed the countersunk nut that screws onto the anchor bolt into the base, thereby restraining the upper end of the anchor bolt to the base. [Effects of the Invention]

[0011] According to the seismic isolation renovation method for wooden buildings using seismic isolation packing under the foundation of the present invention, seismic isolation functionality can be provided without removing existing packing or the like.

Brief Description of the Drawings

[0012] [Figure 1] It is a partial cross-sectional explanatory view of a building before renovation showing an embodiment of the present invention. [Figure 2] It is a plan explanatory view showing the arrangement state of anchor bolts and the like of a building before renovation. [Figure 3] It is a flowchart of a building renovation method. [Figure 4] It is a partial cross-sectional explanatory view of a building showing a state where an existing nut is removed and an insertion clearance is secured by a wedge packing. [Figure 5] It is a side view of a wedge packing. [Figure 6] It is a top view of a wedge packing. [Figure 7] It is a partial cross-sectional explanatory view of a building showing a state where a through hole is being enlarged by a drill with a taper. [Figure 8] It is a partial cross-sectional explanatory view of a building showing a state where a new nut is attached with a seismic isolation packing installed. [Figure 9] It is a top view of a seismic isolation packing. [Figure 10] It is a side view of a seismic isolation packing. [Figure 11] It is a cross-sectional explanatory view of a new nut. [Figure 12] It is a partial cross-sectional explanatory view of a building after renovation. [Figure 13] It is a plan explanatory view showing the arrangement state of seismic isolation packings and the like of a building after renovation. [Figure 14] It is a cross-sectional explanatory view of a new nut and a washer showing a modification example. [Figure 15] It is a perspective view of a washer having an anti-displacement function. [Figure 16] It is a cross-sectional explanatory view of a new nut and a washer showing a modification example. [Figure 17] It is a partial cross-sectional explanatory view of a building after renovation showing a modification example. [Figure 18]This is a plan view illustrating the arrangement of seismic isolation packing and other components in a renovated building, demonstrating a modified example. [Modes for carrying out the invention]

[0013] Figures 1 to 13 show one embodiment of the present invention. Figure 1 is a partial cross-sectional diagram of the building before renovation, Figure 2 is a plan diagram showing the arrangement of anchor bolts, etc., in the building before renovation, Figure 3 is a flowchart of the building renovation method, Figure 4 is a partial cross-sectional diagram of the building showing the state in which the existing nuts have been removed and insertion clearance has been secured with wedge packing, Figure 5 is a side view of the wedge packing, Figure 6 is a top view of the wedge packing, Figure 7 is a partial cross-sectional diagram of the building showing the state in which the through hole is being enlarged with a drill with a drill bit, Figure 8 is a partial cross-sectional diagram of the building showing the state in which the seismic isolation packing has been installed and the new nuts have been attached, Figure 9 is a top view of the seismic isolation packing, Figure 10 is a side view of the seismic isolation packing, Figure 11 is a cross-sectional diagram of the new nuts, Figure 12 is a partial cross-sectional diagram of the building after renovation, and Figure 13 is a plan diagram showing the arrangement of seismic isolation packing, etc., in the building after renovation.

[0014] As shown in Figure 1, the building 1 to be renovated has a concrete foundation 2, a wooden base 3, an existing packing 4 made of, for example, resin, anchor bolts 5 extending upward from the foundation 2, through holes 6 formed in the base 3 through which the anchor bolts 5 are inserted, and existing nuts 7 screwed onto the anchor bolts 5. In this embodiment, the existing packing 4 is an airtight packing to ensure airtightness between the foundation 2 and the base 3. As shown in Figure 1, when hold-down hardware 9 is provided on the columns 8 of the building 1, anchor bolts 15, through holes 16, and existing nuts 17 are provided for column fastening, in addition to the anchor bolts 5, through holes 6, and existing nuts 7 for fastening the base. Furthermore, this building 1 has a main beam 13 that spans the base 3 and is located below the intermediate columns 18. As shown in Figure 2, the existing packing 4 has holes 41 that penetrate vertically, and the anchor bolts 5 and 15 are inserted through the holes 41. The renovation method of this embodiment is applicable regardless of the diameter of the anchor bolts 5, 15 and through holes 6, 16, but here we will explain it assuming that the diameter of the anchor bolt 5 for securing the foundation is 12 mm, the diameter of the through hole 6 is 18 mm, the diameter of the anchor bolt 15 for securing the column is 16 mm, and the diameter of the through hole 16 is 22 mm.

[0015] As shown in Figure 3, the renovation method for building 1 in this embodiment includes: a decay repair step S1 in which the foundation and column base are exposed and decayed or damaged areas are repaired; a nut removal step S2 in which existing nuts 7 and 17 are removed; an existing packing bonding step S3 in which the existing packing 4 and foundation 2 are bonded together; an insertion clearance securing step S4 in which a wedge packing 20 is inserted between the existing packing 4 and the foundation 3 to secure a predetermined insertion clearance; and a seismic isolation clearance securing step in which the through holes 6 and 16 of the foundation 3 are widened to secure a predetermined seismic isolation clearance between the inner surface of the through holes 60 and 160 and the anchor bolts 5 and 15. The process includes S5, a seismic isolation packing insertion step S6 in which a seismic isolation packing 30 configured to slide against the base 3 during an earthquake is inserted between the existing packing 4 and the base 3, where insertion clearance is secured; a seismic isolation packing position adjustment step S7 in which a tool is inserted into the position adjustment groove 36 of the seismic isolation packing 30 to adjust the position of the seismic isolation packing 30; a wedge packing removal step S8 in which a wedge packing 20 is removed from between the existing packing 4 and the base 3; and a nut installation step S9 in which new nuts 70 and 170 are screwed onto anchor bolts 5 and 15 while the seismic isolation packing 30 is inserted between the existing packing 4 and the base 3.

[0016] In this embodiment, the repair process S1 for decayed areas is performed before the nut removal process S2, but the timing of repairing the building can be changed as needed, and it is not always necessary to perform the seismic isolation function and the repair of the building at the same time. Also, in this embodiment, after removing the existing nuts 7 and 17, the existing packing 4 is bonded to the foundation 2. If a height adjustment plate or the like is interposed between the foundation 2 and the base 3 in addition to the existing packing 4, this height adjustment plate is also bonded to the existing packing 4 and the foundation 2. As shown in Figure 4, the existing nuts 7 and 17 are removed to allow the base 3 to move upward, and in the insertion clearance securing process S4, the wedge packing 20 is inserted between the existing packing 4 and the base 3.

[0017] As shown in Figure 5, the wedge packing 20 is formed in a flat plate shape overall. In this embodiment, the wedge packing 20 is made of engineering plastic. The material of the wedge packing 20 is arbitrary and can be made of metal, for example. As shown in Figure 6, the wedge packing 20 is rectangular in plan view and has a main body portion 21 with a thickness corresponding to the insertion clearance described above, a first inclined portion 22 formed on the upper outer edge of one short side, a second inclined portion 23 formed on the upper outer edge of one long side on the side of the first inclined portion 22, and a protrusion portion 24 formed on the upper outer edge of one long side on the side opposite to the first inclined portion 22. The insertion clearance is set to be greater than the thickness of the seismic isolation packing 30, and in this embodiment it is 7 mm. The lower surface of the wedge packing 20 is formed flat. The first inclined portion 22 is formed across the width direction of the wedge packing 20 and inclined downward toward the normal side outward. The second inclined portion 23 is formed on one longitudinal end of the wedge packing 20 and inclined downward toward the normal side. The protruding portion 24 is formed on the other longitudinal end of the wedge packing 20 and protrudes upward by a predetermined height from the main body portion 21. In this embodiment, the protruding height of the protruding portion 24 is 5 mm.

[0018] With the wedge packing 20 configured as described above, one end in the longitudinal direction is placed between the existing packing 4 and the base 3. By moving the wedge packing 20 to one side in the longitudinal direction, an insertion clearance can be secured between the existing packing 4 and the base 3, as shown in Figure 4. Since the wedge packing 20 has a first inclined portion 22, when the wedge packing 20 is moved to one side in the longitudinal direction, the base 3 moves upward. The wedge packing 20 is pushed in until the protruding portion 24 contacts the base 3. In this embodiment, the movement of the wedge packing 20 to one side in the longitudinal direction is performed by hammering the other end of the wedge packing 20 in the longitudinal direction.

[0019] As shown in Figure 7, in this embodiment, in the seismic isolation clearance securing step S5, the through holes 6 and 16 of the foundation 3 are enlarged with the wedge packing 20 inserted between the existing packing 4 and the foundation 3. The enlargement of the through holes 6 and 16 is performed using a drill with an enlargement drill bit 50 while the anchor bolts 5 and 15 are still inserted into the through holes 6 and 16. A conventionally known drill with an enlargement drill bit 50 can be used. Considering the seismic isolation effect of the building during an earthquake, it is preferable that the diameter of the enlarged through holes 60 and 160 be at least 10 mm larger than the diameter of the anchor bolts 5 and 15. Furthermore, considering the damage to various parts and equipment of the building during an earthquake, it is preferable that the difference between the diameter of the enlarged through holes 60 and 160 and the diameter of the anchor bolts 5 and 15 be 30 mm or less. In this embodiment, the diameter of the enlarged through hole 60 is 24 mm for an anchor bolt 5 for foundation fastening with a diameter of 12 mm. Furthermore, for anchor bolts 15 used for fastening columns, which have a diameter of 16 mm, the diameter of the through-hole 160 after enlargement is 28 mm. As shown in Figure 8, after the enlargement of the through-holes 60 and 160 is completed, the seismic isolation packing 30 is inserted between the existing packing 4 and the base 3.

[0020] As shown in Figures 9 and 10, the seismic isolation packing 30 is formed in a rectangular shape in plan view, with its upper surface 31 being smooth to reduce frictional resistance with the base 3, and its lower surface having multiple protrusions 33 to increase frictional resistance with the foundation packing 4. Specifically, the upper surface of the seismic isolation packing 30 has a friction coefficient of 0.2 or more and 0.3 or less with respect to the lower surface of the base 3, and is set to slide against the base 3 during an earthquake. In this embodiment, the seismic isolation packing 30 is made of engineering plastic and has a thickness of 4.5 mm. The material of the seismic isolation packing 30 is arbitrary and can be, for example, metal.

[0021] Since the seismic isolation packing 30 is positioned directly beneath the columns 8 and intermediate columns 18, it is designed to have a penetration strength corresponding to the axial force of the columns 8 and intermediate columns 18. The axial force of the columns accounts for approximately 80% of the total building load, and in a normal building it is between 10kN and 30kN, so it is desirable to have a penetration strength exceeding this, between 30kN and 50kN. To achieve such a penetration strength, the seismic isolation packing 30 can be made, for example, with a short side of about 100mm, a long side of 120mm to 200mm, and a thickness of 1.5mm to 4.5mm. In this embodiment, the long side of the seismic isolation packing 30 is set to a dimension equal to the distance from the center of the column 8 to the anchor bolt 5 for securing the foundation. In this embodiment, each protrusion 33 has a frustoconical shape. The shape of each protrusion 33 is arbitrary and can be, for example, cylindrical, prismatic, or frustoconical. The dimensions of each protrusion 33 are arbitrary, but for example, the height from the bottom surface 32 can be set to 0.2 mm or more and 0.3 mm or less, and the diameter of the base end can be set to about 1 mm. Each protrusion 33 functions as an anti-slip surface against the existing packing 4 during an earthquake. Alternatively, the bottom surface can be made rough instead of having protrusions 33.

[0022] As shown in Figure 9, a first inclined surface 34 is formed on the upper outer edge of one long and short side of the seismic isolation packing 30, sloping downward toward the normal side outward, and a second inclined surface 35, which is steeper in slope than the first inclined surface 34, is formed on the upper outer edge of the other long and short side. The seismic isolation packing 30 also has a position adjustment groove 36 that can receive tools and the like. The position adjustment groove 36 is formed to penetrate the flat portion of the seismic isolation packing 30 in the thickness direction and extend inward from the other long side. The position adjustment groove 36 can be omitted. In this embodiment, the position adjustment groove 36 is formed such that the width dimension at the end is larger than that at the base end. In this embodiment, the position adjustment groove 36 also has an inclined surface 37 that is continuously formed with the second inclined surface 35.

[0023] As described above, the seismic isolation packing 30 is inserted in the seismic isolation packing insertion step S6 between the existing packing 4 and the base 3, with the insertion clearance secured by the wedge packing 20, as shown in Figure 8. In this embodiment, the seismic isolation packing 30 is inserted directly below the columns 8 and studs 18. In addition to below the columns 8 and studs 18, it is inserted above the main beam supports and base supports (not shown), and other locations where a relatively large load is applied to the base 3. Since the seismic isolation packing 30 is not installed at the locations where the anchor bolts 5 and 15 are installed, the installation of the seismic isolation packing 30 effectively eliminates the reaction force applied to the anchor bolts 5 and 15, thus avoiding shear failure of the wood. Furthermore, the load acting on the anchor bolts 5 and 15 is reduced, eliminating the need for the anchor bolts 5 and 15 to provide a relatively large reaction force. Then, in the seismic isolation packing position adjustment step S6, a tool is inserted into the position adjustment groove 36 of each seismic isolation packing 30 to adjust the installation position of the seismic isolation packing 30 to the desired position. Note that the seismic isolation packing position adjustment step S6 can be omitted. After adjusting the position of each seismic isolation packing 30, the wedge packing 20 is removed from between the existing packing 4 and the base 3.

[0024] In this embodiment, the removal of the wedge packing 20 in the wedge packing removal step S7 is performed by rotating the wedge packing 20 by applying force to the portion of the wedge packing 20 that protrudes from the gap between the existing packing 4 and the base 3. The rotation of the wedge packing 20 is performed by hammering the side surface near the protruding portion 24 of the wedge packing 20.

[0025] In the nut installation process S9, with the wedge packing 20 removed, the newly installed nuts 70 and 170 are screwed onto the anchor bolts 5 and 15. Alternatively, the existing nuts 7 and 17 may be reused instead of the newly installed nuts 70 and 170. In this embodiment, the newly installed nut 70 is used for screwing onto the anchor bolt 5 for securing the base, and the upper end of the nut 70 after tightening is at the same level as the upper surface of the base 3. In this embodiment, structural plywood is laid on the upper surface of the base 3 and the nut 70.

[0026] As shown in Figure 11, the nut 70 has a long nut portion 71 that screws onto the anchor bolt 5, and a round seat 72 formed on the upper end side of the long nut portion 71. The nut 70 is a so-called countersunk nut, and a plurality of triangular projections 73 are formed radially outward on the lower surface of the round seat 72. Each triangular projection 73 has a triangular cross-section with an acute apex angle, and is formed so that the height of the apex increases as it extends radially outward. The top of the anchor bolt 5 is restrained to the base 3 side by the nut 70 having the long nut portion 71 and the round seat 72.

[0027] After the above steps, as shown in Figures 12 and 13, the renovated building 1 will have a seismic isolation packing 30 inserted between the existing packing 4 and the foundation 3, a seismic isolation clearance secured between the inner surface of the through holes 60 and 160 and the anchor bolts 5 and 15, and the anchor bolts 5 for securing the foundation will be restrained near the top of the foundation 3. This makes it possible to provide seismic isolation functionality to the existing building 1, which has poor seismic resistance.

[0028] This section describes the seismic isolation function of the renovated building 1 during earthquakes. When a relative horizontal load is applied to the foundation 2 and the base 3 during an earthquake, frictional resistance is generated by horizontal sliding between the upper surface 31 of each seismic isolation packing 30 and the lower surface of the base 3, thereby dissipating seismic energy. The upper surface 31 of each seismic isolation packing 30 functions as an isolator by sliding against the lower surface of the base 3. In this embodiment, inclined surfaces 34 and 35 are formed at the corners of each seismic isolation packing 30, so the corners do not dig into the base 3, and sliding is easily generated between each seismic isolation packing 30 and the base 3. On the other hand, since the protrusions 33 of each seismic isolation packing 30 function as anti-slip surfaces, sliding does not occur between the lower surface of each seismic isolation packing 30 and the upper surface of the existing packing 4. The seismic isolation packing 30 and the existing packing 4 are bonded together with adhesive as needed. Furthermore, when a relative horizontal load is applied to the foundation 2 and base 3 during an earthquake, the anchor bolts 5 and 15 are bent, generating bending stress inside the anchor bolts 5 and 15. Earthquake energy is also consumed by this bending stress in the anchor bolts 5 and 15. In this way, the anchor bolts 5 and 15 and each seismic isolation packing 30 work together to consume earthquake energy.

[0029] In this embodiment, since the diameter of the enlarged through-holes 60 and 160 is 10 mm or more larger than the diameter of the anchor bolts 5 and 15, a relatively large bending stress can be generated in the anchor bolts 5 and 15 throughout the entire length of the through-holes 60 and 160. Furthermore, in this embodiment, since the difference between the diameter of the through-holes 60 and 160 and the diameter of the anchor bolts 5 and 15 is 30 mm or less, the relative movement of the foundation 2 and the base 3 can be limited to 30 mm or less, thereby reducing the possibility of significant damage to various parts and equipment of the building during an earthquake while still providing a seismic isolation effect.

[0030] In the above embodiment, the top of the anchor bolt 5 for fastening the base is shown to be restrained by a countersunk nut 70. However, as shown in Figure 14, for example, it may be restrained to the base 3 using a washer 171 that has a displacement prevention function. As shown in Figure 15, the washer 171 has a flat portion 171b in which an insertion hole 171a for the anchor bolt 5 is formed, and a protruding portion 171c formed on the outer edge side of the flat portion 171b and protruding downward from the flat portion 171b. The washer 171 is circular in plan view, and the protruding portion 171c is formed by bending the outer edge side of the washer 171 so as to bend downward toward the radially outward direction. The diameter of the radial inner end of the protruding portion 171c of the washer 171 is formed to be larger than the diameter of the through hole 60. The outer diameter of the washer 171 is arbitrary, but can be 45 mm, for example. With the washer 171 set on the base 3, tightening the nut 170 that screws onto the anchor bolt 5 causes the washer 170 to move downward, resulting in the protruding portion 171c being embedded in the base 3, as shown in Figure 14. The depth of embedment of the protruding portion 171c is arbitrary as long as at least a part of the protruding portion 171c is embedded, but it may be, for example, 2 mm or more and 3 mm or less. Figure 14 shows the case where the washer 171 is used and the nut 170 is screwed onto the anchor bolt 5 without countersinking the base 3, but as shown in Figure 16, a countersink hole 3a may be formed in the base 3 so that the nut 170 does not rise above the upper surface level of the base 3.

[0031] Furthermore, although the above embodiment showed a building 1 in which an airtight packing was installed as the existing packing 4, the type of existing packing 4 is not particularly limited, and the present invention can also be applied to a building 1 in which a ventilation packing is installed as the existing packing 14 to ensure ventilation between the foundation 2 and the base 3, as shown in Figures 17 and 18. The existing packing 14 shown in Figures 17 and 18 has a hole 141 that penetrates vertically, as well as a ventilation opening 142 that penetrates horizontally.

[0032] Furthermore, although the above embodiment shows a wedge packing 20 being used to secure the insertion clearance, other means may be used to secure the insertion clearance. Also, the seismic isolation packing 30 can be arbitrarily modified in shape, dimensions, and material, as long as it is configured to slide against the base 3 during an earthquake.

[0033] Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. [Explanation of Symbols]

[0034] 1 Building 2 Basics 3. Base 3a Counterbore hole 4 Existing packing 5 Anchor bolts 6 Through hole 7 Existing nuts 8 pillars 9 Hold-down hardware 13. Big pull 14 Existing packing 15 Anchor bolts 16 through holes 17 Existing nuts 18 bay pillars 20 Wedge packing 21 Main body 22 1st slope part 23 2nd slope part 24 Protrusion 30 Seismic isolation packing 31 Top side 32 Bottom surface 33 Convex part 34 1st slope 35 Second slope 36 Position adjustment groove 37 Slope 41 holes 50 Drill with diameter expanding tip 60 through holes 70 nuts 71 Long nut section 72 Round base 73 Triangular protrusion 141 holes 142 Ventilation opening 160 through holes 170 Nut 171 Washer 171a Through hole 171b Flat area 171c protrusion S1 Repair process for decayed areas, etc. S2 Nut Removal Process S3 Existing packing bonding process S4 Insertion clearance securing process S5 Seismic Isolation Clearance Securing Process S6 Seismic isolation packing insertion process S7 Seismic isolation packing position adjustment process S8 Wedge packing removal process S9 Nut Installation Process

Claims

1. A foundation made of concrete, A base made of wood, The existing packing interposed between the foundation and the base, An anchor bolt extending upward from the aforementioned foundation, The base has a through hole formed therein through which the anchor bolt is inserted, A method for renovating a building to be renovated, which provides seismic isolation functionality to an existing nut that screws into the aforementioned anchor bolt, The process of removing the existing nut, An insertion clearance securing step is performed to secure a predetermined insertion clearance between the existing packing and the base, A seismic isolation clearance securing step, which involves widening the through-hole in the base to secure a predetermined seismic isolation clearance between the inner circumferential surface of the through-hole and the anchor bolt, A seismic isolation packing insertion step involves inserting a seismic isolation packing, configured to slide against the base during an earthquake, between the existing packing and the base, where the aforementioned insertion clearance has been secured. A method for seismic isolation renovation using seismic isolation packing under the foundation of a wooden building, comprising a nut installation step of screwing the existing nut or a new nut onto the anchor bolt while the seismic isolation packing is inserted between the existing packing and the foundation.

2. In the insertion clearance securing step, a wedge packing having an insertion portion with a thickness corresponding to the insertion clearance is inserted between the existing packing and the base. A method for seismic isolation renovation using seismic isolation packing under the foundation of a wooden building, according to claim 1, further comprising a wedge packing removal step of removing the wedge packing from between the foundation packing and the foundation after the seismic isolation packing insertion step.

3. The seismic isolation packing is formed in a flat plate shape and has a position adjustment groove into which a tool can be inserted when it is inserted into the existing packing and the base. A method for seismic isolation renovation using seismic isolation packing under the foundation of a wooden building, according to claim 1, further comprising a seismic isolation packing position adjustment step, in which a tool is inserted into the position adjustment groove to adjust the position of the seismic isolation packing after the seismic isolation packing insertion step.

4. A seismic isolation renovation method for a wooden building using a seismic isolation packing under the foundation, according to claim 1, further comprising a step of bonding the existing packing to the foundation after the nut removal step.

5. A seismic isolation renovation method for a wooden building using a seismic isolation packing under the foundation, as described in claim 1, wherein in the nut installation step, a nut having a long nut portion that screws into the anchor bolt and a round base that contacts the foundation is used to restrain the upper end of the anchor bolt to the foundation.

6. A seismic isolation renovation method for a wooden building using a seismic isolation packing under the foundation, as described in claim 1, wherein in the nut installation step, a washer through which the anchor bolt is inserted is embedded into the foundation to restrain the upper end of the anchor bolt to the foundation.

Images