Anti-loosening bracket for seismic isolation device fixing bolts.

Abstract

To provide a metal fitting for preventing bolt loosening for fixing a seismic isolation device, which completely prevents bolts from loosening physically, improves the safety of a building against earthquakes, and dramatically shortens the work time required for the maintenance. [Solution] The seismic isolation device fixing bolt loosening prevention fitting has a plate-shaped main body, a hole in the center of the main body into which the hexagonal head of the seismic isolation device fixing bolt fits, the shape of the hole is a dodecagonal star or an octadecagonal star, and a locking portion on the periphery that physically prevents the seismic isolation device fixing bolt loosening prevention fitting from rotating.

Description

[Technical Field]

[0001] The present invention relates to a seismic isolation device fixing bolt loosening prevention fitting that prevents the bolts that fix a building's seismic isolation device to the foundation from loosening. [Background technology]

[0002] A building's seismic isolation device is secured to the building's lower seismic isolation foundation with several bolts. Furthermore, the top of the seismic isolation device is secured to the upper seismic isolation foundation at the base of the building with numerous bolts. These bolts are referred to as seismic isolation device fixing bolts in this application. The nuts that mate with the seismic isolation device fixing bolts are embedded in the lower and upper seismic isolation foundations. Because buildings frequently vibrate due to weak earthquakes, the seismic isolation device fixing bolts gradually loosen. If a strong earthquake occurs when the seismic isolation device fixing bolts become significantly loose, the seismic isolation device is likely to come off its mounting base, creating a significant risk. Therefore, annual maintenance is performed to check which bolts are loose and retighten any loose bolts. The cost per property varies depending on the number of seismic isolation devices, but ranges from 200,000 yen to 1 million yen. There are approximately 9,000 buildings in Japan equipped with seismic isolation devices, resulting in enormous costs.

[0003] Various methods have been proposed to prevent bolts from loosening. For example, the method proposed in Patent Document 1 involves modifying the shape of the male thread. The method proposed in Patent Document 2 also involves modifying the shape of the male thread. However, when these methods are used to fasten seismic isolation devices, even if the degree of loosening is reduced compared to when normal bolts are used, it does not mean that loosening will not occur, and maintenance is still required, such as periodically checking the bolts for looseness and retightening any loose bolts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2019-218993 [Patent Document 2] Patent Publication No. 2012-112403 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem that the present invention aims to solve is to provide a bolt locking fixture for seismic isolation devices that physically and completely prevents bolts from loosening, thereby improving the safety of buildings against earthquakes and dramatically shortening the work time required for the above-mentioned maintenance. [Means for solving the problem]

[0006] As described above, the seismic isolation device is fixed with bolts to a base plate embedded in the seismic isolation foundation of a building. As shown in Figure 1, a long nut 5 is used as a pair with each bolt 1, and the long nut is welded to the back surface of the base plate 4. An anchor bolt 6 is attached to the long nut, and a fixing plate 7 is attached to the tip of the anchor bolt. To prevent the bolt from loosening, it is sufficient to prevent the bolt from rotating. The head of the bolt is shaped like a hexagonal pillar. After extensive research, the inventors of the present application came up with the idea that bolt rotation can be prevented by fitting a plate with a hole that fits over the bolt head and providing a structure on the outer edge of the plate that physically prevents the plate from rotating freely.

[0007] Hereinafter, the above-mentioned item having a hole that fits over the head of a bolt and a structure at one end that prevents free rotation will be referred to as a "seismic isolation device fixing bolt locking fitting," or simply "locking fitting." The part that has the hole that fits over the head of the bolt will be referred to as the main body, and the part that has the structure that physically prevents the locking fitting from rotating freely will be referred to as the locking part.

[0008] The shape of the hole in the locking fitting into which the bolt head fits must be such that, when the bolt head is fitted into the locking fitting, the bolt cannot freely rotate relative to the locking fitting. To achieve this, a hexagonal shape with the same dimensions and shape as the bolt head is acceptable, but in that case, the angle between the bolt and the locking fitting can only be adjusted in 60-degree increments, limiting flexibility. Therefore, the shape of the hole is a regular dodecagon or a regular octagon with a star shape in which adjacent vertices of a regular dodecagon are recessed. Hereinafter, a star shape in which adjacent vertices of a regular dodecagon are recessed will be referred to as a dodecagonal star, and a star shape in which adjacent vertices of a regular octagon are recessed will be referred to as an octagonal star. When the hole shape is a dodecagonal star, the angle between the bolt and the locking fitting can be adjusted in 30-degree increments, and when it is an octagonal star, it can be adjusted in 20-degree increments, providing greater flexibility and ease of use. Furthermore, it is preferable that the size of the hole be such that the length between the vertices of the dodecagonal or octadecagonal star opposite each other across the center is slightly longer than the length between the vertices of the hexagonal head of the seismic isolation device fixing bolt opposite each other across the center.

[0009] Figure 2 shows a locking bracket with an octagonal star-shaped hole (Figure 2A), the state when the bolt head is fitted into type A (Figure 2B), a locking bracket with a dodecagonal star-shaped hole (Figure 2C), and the state when the bolt head is fitted into type C (Figure 2D). When the bolt head 1 fits into hole 9-1 of the locking bracket 9, each hexagonal vertex of the bolt head engages with every other or every third vertex of the dodecagonal or dodecagonal star-shaped hole. As the bolt rotates, the locking bracket rotates with it. Therefore, if the bolt head is fitted into the hole of the locking bracket and the locking bracket's rotation is prevented, the bolt rotation is also prevented, and the bolt will not loosen. Note that bolts for seismic isolation device installations are typically right-handed; rotating the bolt clockwise tightens it and rotating it counterclockwise loosens it. To prevent loosening, the bolt should be prevented from rotating counterclockwise.

[0010] The placement of the seismic isolation device fixing bolts varies depending on the type of seismic isolation device, but can be broadly divided into three types. The first type is a type in which they are placed on the periphery of the lower and upper parts of the seismic isolation device 8, as shown in Figure 3. The second type is a type in which they are lined up in a single row in the center of the seismic isolation device, as shown in Figure 4. The third type is a type in which they are lined up in two rows in the center of the seismic isolation device, as shown in Figure 5. We have devised four types of anti-loosening fittings that are compatible with each of these types.

[0011] A locking device compatible with the first type of bolt arrangement has a structure in which, when the bolt is fitted into the hole in the locking device, one end of the locking device protrudes outside the outer periphery of the bottom surface of the seismic isolation device, and the protruding part has a columnar protrusion protruding vertically downward. This columnar protrusion is the locking part of this type of locking device. When the bolt loosens and rotates, the locking device rotates with it, and the columnar protrusion comes into contact with the outer periphery of the bottom surface of the seismic isolation device, preventing the locking device from rotating any further. Therefore, the bolt will not loosen any further.

[0012] Another type of locking device compatible with the first type of bolt arrangement has a locking mechanism in which, when the hole of the locking device is fitted onto the seismic isolation device fixing bolt, one end of the locking device protrudes outside the outer periphery of the bottom surface of the seismic isolation device, and a U-nut (registered trademark) is welded to the protruding portion. The bolt is inserted into the U-nut toward the seismic isolation device and secured by the U-nut. The U-nut and the bolt form the locking part of this type of locking device. When the seismic isolation device is fixed with a bolt, this type of locking device is fitted onto the bolt, and the bolt is tightened until the tip of the bolt shaft of the locking part of the locking device protruding outside the outer periphery of the bottom surface of the seismic isolation device comes into contact with the seismic isolation device, thereby securing the locking device. Because the locking device is fixed, the seismic isolation device fixing bolt fitted into the locking device is also fixed and will not loosen.

[0013] A locking device compatible with the second type of bolt arrangement consists of a head with a hole into which the bolt fits and a leg extending rectangularly from the head. When the locking device is fitted to the bolt, the left longitudinal edge of the leg is bent vertically away from the bottom surface of the seismic isolation device. This bent vertically is the locking portion of this type of locking device. The length of the leg is long enough that when the locking device is fitted to adjacent bolts lined up in a row in the center of the seismic isolation device, the two locking portions face each other and come into contact. When the adjacent bolts loosen and rotate counterclockwise, the locking portions of the locking device fitted to the two bolts eventually come into contact with each other, preventing the counterclockwise rotation of the locking portion they are in contact with. Therefore, the adjacent bolts cannot loosen any further.

[0014] A locking fitting compatible with the third type of bolt arrangement has a main body having holes for receiving bolts, the outer edge of which is gear-shaped in part or in whole, so that when the gear-shaped shapes of two locking fittings for fixing bolts of the seismic isolation device are in contact with each other, the gear-shaped shapes of the two locking fittings for fixing bolts of the seismic isolation device mesh with each other. The gear-shaped shapes are the locking parts of this type of locking fitting. The size of the locking fitting is such that when the locking fittings are fitted onto each of two rows of adjacent bolts lined up in the center of the seismic isolation device with the locking parts facing each other, the gear-shaped teeth of the two locking fittings mesh with each other. When the two adjacent bolts loosen and attempt to rotate counterclockwise, the gear-shaped teeth of the two locking fittings collide, causing the teeth of the right locking fitting to move downward and the teeth of the left locking fitting to move upward, pushing against each other, preventing either locking fitting from rotating counterclockwise any further and preventing either bolt from loosening any further.

[0015] The material of this anti-loosening fitting can be any material with a certain level of strength and high rigidity, but a ferromagnetic metal, such as iron, is preferred. As mentioned above, the top of the seismic isolation device is fixed with numerous bolts to the upper seismic isolation foundation installed at the bottom of the building. In this case, the bolts face upward, and even if anti-loosening fittings are fitted to these bolts, they will fall due to gravity unless special measures are taken. An upper base plate for fixing the seismic isolation device is installed on the surface of the upper seismic isolation foundation, and the seismic isolation device is fixed to this base plate with bolts through a flange plate installed on the seismic isolation device. This flange plate is made of iron, a ferromagnetic material. If the anti-loosening fitting is made of a ferromagnetic material, inserting a magnet between the anti-loosening fitting and the flange plate will attract the magnet and prevent it from falling.

[0016] The thicker the fastener, the stronger it will be, but from the standpoint of workability and cost, it is better to have a thinner fastener. A thickness of around 2mm to 5mm is appropriate.

[0017] The first invention is a seismic isolation device fixing bolt loosening prevention fitting, characterized in that the main body is plate-shaped and has a hole in the center of the main body into which the hexagonal head of the seismic isolation device fixing bolt fits, the hole is shaped like a dodecagonal star or an octadecagonal star, and has a locking portion on the periphery that physically prevents the seismic isolation device fixing bolt loosening prevention fitting from rotating.

[0018] The second invention is a seismic isolation device fixing bolt loosening prevention fitting according to the first invention, characterized in that the locking portion is a columnar protrusion protruding vertically from the main body portion.

[0019] The third invention is a seismic isolation device fixing bolt loosening prevention fitting according to the first invention, characterized in that a U-nut is welded and fixed to the peripheral portion, a bolt is attached to the U-nut, and the U-nut and the bolt form the locking portion.

[0020] The fourth invention is a seismic isolation device fixing bolt loosening prevention fitting according to the first invention, characterized in that the main body consists of a head having the hole and a leg extending from the head in a rectangular shape, one side of the leg is bent vertically, and the bent part forms the locking part.

[0021] The fifth invention is a seismic isolation device fixing bolt loosening prevention fitting related to the first invention, characterized in that part or all of the outer edge of the main body is gear-shaped, and when the gear-shaped shapes of two seismic isolation device fixing bolt loosening prevention fittings come into contact with each other, the gear-shaped shapes of the two seismic isolation device fixing bolt loosening prevention fittings mesh with each other. [Effects of the Invention]

[0022] The provision of the seismic isolation device fixing bolt loosening prevention fittings of the present invention makes it extremely easy to check for loosening of seismic isolation device fixing bolts, significantly reducing the need for retightening work and significantly reducing the costs previously spent on this work. Furthermore, by preventing loosening of seismic isolation device fixing bolts, the safety of buildings against earthquakes is greatly improved. [Brief explanation of the drawings]

[0023] [Figure 1] This is a diagram showing how the seismic isolation device fixing bolts are fixed to the foundation. [Figure 2] A diagram showing the relationship between the shape of the hole in the seismic isolation device fixing bolt locking fitting and the shape of the head of the seismic isolation device fixing bolt. [Figure 3] FIG. 10 is a diagram showing a type of seismic isolation device in which fixing bolts are arranged around the lower and upper peripheral edges of the seismic isolation device. [Figure 4] FIG. 10 shows a type of seismic isolation device in which the fixing bolts are arranged in a row in the center of the bottom of the seismic isolation device. [Figure 5] This is a diagram showing a type of seismic isolation device in which fixing bolts are arranged in two rows in the center of the bottom of the seismic isolation device. [Figure 6]1A and 1B are a front view, a right side view, a bottom view, and a perspective view of a locking fitting according to a first embodiment of the present invention; [Figure 7] FIG. 2 is a plan view showing a state in which the anti-loosening fitting according to the first embodiment is used to fix the seismic isolation device. [Figure 8] FIG. 2 is a side view showing a state in which the anti-loosening fitting according to the first embodiment is used to fix the seismic isolation device. [Figure 9] 1 is a diagram showing a state in which the anti-loosening fitting according to Example 1 is used on the seismic isolation device fixing bolt that fixes the upper side of the seismic isolation device to the upper foundation. [Figure 10] 1 is a plan view showing one corner of a flange of a seismic isolation device fixed to a foundation using a locking fitting according to Example 1. FIG. [Figure 11] 10A and 10B are a front view, a right side view, a bottom view, and a perspective view of a locking fitting according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a plan view showing a state in which a locking fitting according to a second embodiment is used to fasten a seismic isolation device. [Figure 13] FIG. 10 is a side view showing a state in which a locking fitting according to a second embodiment is used to fasten a seismic isolation device. [Figure 14] 10 is a plan view showing a portion of a flange of a seismic isolation device fixed to a foundation using a locking fitting according to a second embodiment. FIG. [Figure 15] 10A and 10B are a front view, a right side view, a bottom view, and a perspective view of a locking fitting according to a third embodiment of the present invention. [Figure 16] FIG. 10 is a plan view showing a state in which a locking fitting according to a third embodiment is used to fasten a seismic isolation device. [Figure 17] FIG. 10 is a side view showing a state in which a locking fitting according to a third embodiment is used to fasten a seismic isolation device. [Figure 18] FIG. 11 is a plan view showing a portion of a flange of a seismic isolation device fixed to a foundation using a locking fitting according to a third embodiment. [Figure 19] 10A and 10B are a front view, a right side view, a bottom view, and a perspective view of a locking fitting according to a fourth embodiment of the present invention. [Figure 20]FIG. 10 is a plan view showing a state in which a locking fitting according to a fourth embodiment is used to fasten a seismic isolation device. [Figure 21] FIG. 10 is a side view showing a state in which a locking fitting according to a fourth embodiment is used to fasten a seismic isolation device. [Figure 22] FIG. 10 is a plan view showing a portion of a flange of a seismic isolation device fixed to a foundation using a locking fitting according to a fourth embodiment. [Figure 23] 10A and 10B are a front view, a right side view, a bottom view, and a perspective view of a locking fitting according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0024] Next, an embodiment of the present invention will be described, but it goes without saying that various changes and modifications can be made without departing from the technical scope of the present invention. [Example]

[0025] This embodiment is a bolt locking device for seismic isolation device fixing bolts according to the second aspect of the present invention. Figure 6 shows a front view (A), a right side view (B), a bottom view (C), and a perspective view (D) of the bolt locking device 9 of this embodiment. The bolt locking device 9 has a hole 9-1 that fits over the hexagonal head of the bolt, and a columnar protrusion 9-2 at its end. The hole is shaped like an octagonal star. When fitted over the hexagonal head of the bolt, the six vertices of the hexagonal head fit precisely into every third vertex of the bolt locking device. When the bolt rotates around its axis, the bolt locking device rotates with it. Furthermore, when the bolt locking device is fixed, the bolt to which the locking device is fitted cannot rotate. The surface of the columnar protrusion 9-2 at the end of the bolt locking device is covered with a resin roller 9-2-1. The columnar protrusion presses against the flange of the seismic isolation device. Although the equipment flange is treated with anti-rust coating, if the columnar protrusions press against the equipment flange and scratch it, this could cause the equipment flange to rust. The role of resin roller 9-2-1 is to prevent the equipment flange from being damaged even when the columnar protrusions press against it. Figure 7 shows a plan view of the seismic isolation device 8 being secured with this anti-loosening fitting. The seismic isolation device fixing bolts 1 are positioned around the periphery of the flange plate 3 of the seismic isolation device 8, and the anti-loosening fitting 9 is fitted into the hexagonal column-shaped head of each bolt. Figure 8 shows a side view of the seismic isolation device 8 being secured with this anti-loosening fitting. The seismic isolation device 8 is secured between an upper foundation 10 and a lower foundation 11. Base plates 4 for securing the seismic isolation device are embedded in the surfaces of the upper and lower foundations, and flange plates 3 are attached to the top and bottom of the seismic isolation device. The seismic isolation device fixing bolts 1 pass through the base plates from above the flange plates and are tightened into long nuts embedded in the foundation, securing the seismic isolation device to the foundation. The anti-loosening fitting 9 of this embodiment is fitted into the hexagonal column-shaped head of the seismic isolation device fixing bolt. Figure 9 shows the anti-loosening fitting of this embodiment being used on the bolts securing the top of the seismic isolation device. In this embodiment, bolt 1 is inserted upward into flange plate 3 of the seismic isolation device. The columnar projection 9-2 of the locking bracket 1 contacts the side of the flange plate. A magnet 9-6 is sandwiched between the locking bracket and the flange plate to prevent the locking bracket 9 from falling due to gravity. Figure 10 shows an enlarged view of this locking bracket being used to secure seismic isolation device 8. The arrow on bolt 1 indicates the direction of rotation that loosens the bolt. When bolt 1 rotates, locking bracket 9 also rotates, but the columnar projection 9-2 on the end of locking bracket 9 contacts the side of flange plate 3, preventing locking bracket 9 from rotating any further. Therefore, bolt 1, whose head is engaged with locking bracket 9, cannot rotate any further, and the bolt will not loosen any further. [Example]

[0026] This embodiment is a seismic isolation device fixing bolt loosening prevention device according to the third aspect of the present invention. Figure 11 shows a front view (A), a right side view (B), a bottom view (C), and a perspective view (D) of the seismic isolation device fixing bolt 9 of this embodiment. This seismic isolation device fixing bracket 9 also has a hole 9-1 into which the hexagonal column-shaped head of the seismic isolation device fixing bolt fits. The shape of the hole 9-1 is the same as that of the hole in the seismic isolation device fixing bracket of Example 1. U-nuts 9-3-2 are welded to the periphery of this seismic isolation device fixing bracket 9, and bolts 9-3-1 are attached to the U-nuts. The welded U-nuts 9-3-2 and the bolts 9-3-1 form a locking portion. Figure 12 shows a plan view of this seismic isolation device fixing bracket used to fix a seismic isolation device 8. Seismic isolation device fixing bolts 1 are arranged around the periphery of the flange plate 3 of the seismic isolation device 8, and this seismic isolation device fixing bracket 9 is fitted into the hexagonal column-shaped head of each seismic isolation device fixing bolt. Figure 13 shows a side view of this anti-loosening fitting used to secure a seismic isolation device 8. The seismic isolation device 8 is fixed between an upper foundation 10 and a lower foundation 11. Base plates 4 for securing the seismic isolation device are embedded in the surfaces of the upper and lower foundations, and flange plates 3 are attached to the top and bottom of the seismic isolation device. The seismic isolation device fixing bolts 1 pass through the base plates from above the flange plates and are tightened into long nuts embedded in the foundation, securing the seismic isolation device to the foundation. The anti-loosening fitting 9 of this embodiment is fitted into the hexagonal column-shaped head of the seismic isolation device fixing bolt. Figure 14 shows an enlarged view of this anti-loosening fitting used to secure a seismic isolation device 8. The anti-loosening fitting 9 is fitted into the head of bolt 1. Bolt 9-3-1, the locking part of the anti-loosening fitting 9, is tightened until the tip of the screw presses against the side of the flange plate. The arrow on bolt 1 indicates the rotation direction that the bolt loosens. When bolt 1 tries to rotate, locking bracket 9 also tries to rotate, but the tip of the threads of bolt 9-3-1 attached to the locking part of locking bracket 9 presses against the side of flange plate 3, fixing it in place, preventing locking bracket 9 from rotating. Therefore, bolt 1, whose head is fitted into locking bracket 9, cannot rotate either, and the bolt will not loosen. [Example]

[0027] This example is a bolt locking device for seismic isolation device fixing bolts according to the fourth aspect of the present invention. Figure 15 shows a front view (A), a right side view (B), a bottom view (C), and a perspective view (D) of the bolt locking device 9 of this example. The bolt locking device 9 comprises a head portion having a hole 9-1 into which the hexagonal column-shaped head of the bolt for fixing the seismic isolation device fits, and a leg portion extending rectangularly from the head portion. One side of the leg portion is bent vertically, and the bent portion 9-4 forms a locking portion. Figure 16 shows a plan view of the bolt locking device used to fix a seismic isolation device. The bolts for fixing the seismic isolation device 1 are arranged in a row at the periphery and center of the flange plate 3 of the seismic isolation device. The bolts arranged at the periphery of the flange plate are fitted with the bolt locking device of Example 1. The bolts arranged in a row at the center of the flange plate are fitted with the bolt locking device 9 of this example. Figure 17 shows a side view of the seismic isolation device 8 being secured using this anti-loosening fitting. The seismic isolation device 8 is secured between an upper foundation 10 and a lower foundation 11. Base plates 4 for securing the seismic isolation device are embedded in the surfaces of the upper and lower foundations, and flange plates 3 are provided on the top and bottom surfaces of the seismic isolation device. Anti-loosening fittings 9 of this embodiment are fitted to the bolts arranged in a row in the center of the flange plates. Figure 18 shows an enlarged view of the seismic isolation device 8 being secured using this anti-loosening fitting. The bolts securing the peripheral edges of the flange plates are fitted with the anti-loosening fittings of Example 1, and the anti-loosening fittings 9 of this embodiment are fitted to the bolts arranged in a row in the center of the flange plate. For the bolts arranged in a row in the center of the flange plate, the distance between adjacent bolts is such that, when the anti-loosening fittings of this embodiment are fitted to both bolts, their locking portions 9-4 will collide when the legs of the anti-loosening fittings fitted to both bolts face each other. The arrow on bolt 1 indicates the direction of rotation that loosens the bolt. The direction of rotation that loosens the bolt is counterclockwise. When bolt 1 rotates, the locking bracket 9 of this embodiment also rotates. When the right-hand bolt of two adjacent bolts in the figure rotates counterclockwise, the locking portion 9-4 of the locking bracket fitted to that bolt moves downward. On the other hand, when the left-hand bolt of the adjacent bolt rotates counterclockwise, the locking portion 9-4 of the locking bracket fitted to that bolt moves upward. Eventually, the locking portion 9-4 of the locking bracket fitted to the right-hand bolt and the locking portion 9-4 of the locking bracket fitted to the left-hand bolt collide and push against each other, preventing either locking bracket from rotating further counterclockwise. This prevents the bolts fitted with these locking brackets from rotating further counterclockwise, i.e., in the loosening direction. Therefore, these two bolts cannot loosen any further. [Example]

[0028] This example is a bolt locking device for seismic isolation device fixing bolts according to the fifth aspect of the present invention. Figure 19 shows a front view (A), a right side view (B), a bottom view (C), and a perspective view (D) of the bolt locking device 9 of this example. The bolt locking device 9 has a hole 9-1 into which the hexagonal head of the bolt for fixing the seismic isolation device fits, and a gear tooth shape 9-5 on part of its periphery, which forms the locking portion. Figure 20 shows a plan view of the bolt locking device used to fix the seismic isolation device. Two rows of bolts 1 for fixing the seismic isolation device are arranged on the periphery and center of the flange plate 3 of the seismic isolation device. The bolt locking device of Example 1 is fitted to the bolts arranged on the periphery of the flange plate. The bolt locking device 9 of this example is fitted to the bolts arranged in two rows in the center of the flange plate. Figure 21 shows a side view of the bolt locking device used to fix the seismic isolation device 8. The seismic isolation device 8 is fixed between an upper foundation 10 and a lower foundation 11. Base plates 4 for fixing the seismic isolation device are embedded in the surfaces of the upper and lower foundations, and flange plates 3 are attached to the top and bottom surfaces of the seismic isolation device. The anti-loosening fittings 9 of this embodiment are fitted to the bolts arranged in two rows in the center of the flange plates. Figure 22 shows an enlarged view of the anti-loosening fittings used to fix the seismic isolation device 8. The anti-loosening fittings of Example 1 are fitted to the bolts securing the periphery of the flange plates, and the anti-loosening fittings 9 of this embodiment are fitted to the bolts arranged in two rows in the center of the flange plates. For the bolts arranged in two rows in the center of the flange plates, the distance between adjacent bolts is the length required for the gear-shaped teeth 9-5 to mesh with each other when the anti-loosening fittings of this embodiment are fitted to both bolts. The arrow on bolt 1 indicates the direction of rotation that loosens the bolt. The bolt loosens in a counterclockwise direction. When bolt 1 attempts to rotate, the locking fitting 9 of this embodiment also attempts to rotate. When the upper bolt of two adjacent bolts in the figure rotates counterclockwise, the tooth 9-5 of the locking fitting fitted to that bolt attempts to move to the right. On the other hand, when the lower bolt of the adjacent bolt rotates counterclockwise, the tooth 9-5 of the locking fitting fitted to that bolt attempts to move to the left.The teeth of the upper and lower locking fittings are interlocked, so they press against each other and neither locking fitting can rotate counterclockwise. This means that the bolt fitted with these locking fittings cannot rotate counterclockwise, i.e., in the loosening direction. Therefore, these two bolts will not loosen. [Example]

[0029] This embodiment is a locking fitting for seismic isolation device fixing bolts according to the second invention of the present application, and has the same locking portion as the locking fitting of embodiment 1, but the shape of the hole into which the seismic isolation device fixing bolt is fitted is a star-shaped dodecagon, different from embodiment 1. Figure 23 shows a front view (A), right side view (B), bottom view (C) and perspective view (D) of the locking fitting 9 of this embodiment.

[0030] The installation of the anti-loosening fittings of the present invention is extremely simple; when first installing the seismic isolation device, after tightening the bolts for fixing the seismic isolation device, the anti-loosening fittings are fitted onto the heads of each bolt, and in the case of upward-facing bolts, a magnet is simply sandwiched between the anti-loosening fittings and the flange plate of the seismic isolation device. [Industrial Applicability]

[0031] The locking fittings of the present invention can be applied not only to bolts used in fixing seismic isolation devices, but also to bolts used in vehicles and other machines and devices that are exposed to constant vibration. [Explanation of symbols]

[0032] 1 Seismic isolation device fixing bolt 2 washers 3 Seismic isolation device flange plate 4 base plates 5 Long nuts 6 anchor bolts 7 Fixing plate 8 Seismic isolation device 9 Anti-loosening fittings for seismic isolation device fixing bolts Hole 9-1 9-2 Columnar process 9-2-1 Resin roller 9-3-1 Locking bolt 9-3-2 Locking Nut 9-4 Locking part 9-5 Locking teeth 9-6 Magnet 10 Upper foundation 11 Lower foundation

Claims

1. A seismic isolation device fixing bolt loosening prevention fitting, The main body is plate-shaped, The main body has a hole in the center thereof into which the hexagonal column-shaped head of the seismic isolation device fixing bolt fits, The hole has a shape of a dodecagonal star or an octadecagonal star, The periphery of the bolt locking fixture has a locking portion that physically prevents the bolt locking fixture from rotating. the body portion comprises a head portion having the hole and a leg portion extending from the head portion; a columnar projection at the end of each leg projecting perpendicularly from the leg; The columnar projection forms the locking portion, The surface of the columnar projection is covered with a resin roller. A bolt locking fixture for a seismic isolation device.

2. A seismic isolation device fixing bolt loosening prevention fitting, The main body is plate-shaped, The main body has a hole in the center thereof into which the hexagonal column-shaped head of the seismic isolation device fixing bolt fits, The hole has a shape of a dodecagonal star or an octadecagonal star, The periphery of the bolt locking fixture has a locking portion that physically prevents the bolt locking fixture from rotating. A U-nut is welded to the periphery, A bolt is attached to the U-nut, The U-nut and the bolt form the locking portion. A bolt locking fixture for a seismic isolation device.

3. A seismic isolation device fixing bolt loosening prevention fitting, The main body is plate-shaped, The main body has a hole in the center thereof into which the hexagonal column-shaped head of the seismic isolation device fixing bolt fits, The hole has a shape of a dodecagonal star or an octadecagonal star, The periphery of the bolt locking fixture has a locking portion that physically prevents the bolt locking fixture from rotating. the main body comprises a head portion having the hole and a leg portion extending in a rectangular shape from the head portion, The seismic isolation device fixing bolt is arranged so that the head is on the front side and the leg is on the back side, and the left side of the leg when observed from above is bent vertically upward, The bent portion forms the locking portion. A bolt locking fixture for a seismic isolation device.

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