Strain adjustment device

Abstract

To provide a new technology capable of adjusting a strain in a tie-rod that could happen due to shrinkage of lumber and the like in a tie-down system.SOLUTION: A strain adjustment device is the strain adjustment device of a tie-down system which includes a tie-rod inserted in a structural skeleton of a building, and a nut screwed to the tie-rod on the structural skeleton, and in which the tie-rod is pulled upward and made to be strained by rotating the nut in a fastening direction and fastening it. The strain adjustment device includes: an inner cover engaged with a side surface of the nut; an outer cover arranged on the outside of the inner cover, and fixed with respect to the structural skeleton of the building; and energization means arranged between the inner cover and the outer cover, and for energizing a rotational force in the direction of rotating the nut in the fastening direction, between the outer cover and the inner cover.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a strain adjustment device. [Background technology]

[0002] Currently, the tie-down system is known as a technology to prevent the lifting of load-bearing walls in wooden buildings during typhoons and earthquakes. With this technology, tie rods are installed so that they penetrate through multiple floors from the bottom floor, and the tie rods are fastened and fixed to the structural frame (floors, etc.) of each floor with nuts, so that the pulling force can be distributed and supported by each floor.

[0003] Incidentally, it is known that in wooden buildings, the structural frame made of wood shrinks over time as it dries, and the gaps between the components shrink due to vertical loads, causing the entire building to sink. The amount of sinking is greater in mid-rise buildings than in low-rise buildings. Therefore, when a tie-down system is used in a mid-rise building, gaps may occur between the structural frame (floors, etc.) and the nuts due to shrinkage of wood, and the tie rod may not function properly to prevent the building from floating up.

[0004] Patent Document 1 proposes a gasket that is placed between a nut and a wall or the like in a tie-down system. When the gap between the nut and the wall or the like increases as the wood of the wall or the like dries and shrinks, the gasket is configured to use spring force to expand its axial length to follow the gap. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7078773 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above points. An object of the present invention is to provide a new technique for adjusting distortion of a tie rod that may occur due to shrinkage of wood in a tie-down system. [Means for solving the problem]

[0007] The strain adjustment device according to the first aspect of the present invention comprises: A strain adjustment device for a tie-down system having a tie rod inserted into a structural frame of a building and a nut screwed onto the tie rod on the structural frame, the device pulling the tie rod upward and tensioning the tie rod by rotating the nut in a tightening direction to tighten the nut, An inner cover that engages with a side surface of the nut; an outer cover disposed outside the inner cover and fixed to a structural frame of the building; a biasing means for biasing the nut between the inner cover and the outer cover in a direction that rotates the nut in the fastening direction, the biasing means being disposed between the inner cover and the outer cover; Equipped with.

[0008] According to this embodiment, a rotational force in a direction to rotate the nut in the tightening direction is applied between the outer cover fixed to the structural frame of the building and the inner cover engaged with the side of the nut by the biasing means, so that when a gap is formed between the nut and the structural frame due to shrinkage caused by drying of the structural frame, etc., and the tightening of the nut is about to loosen, the inner cover is automatically rotated together with the nut in the tightening direction by the biased rotational force in accordance with the loosening that is about to occur. This allows the nut to continue to be tightened without loosening, and as a result, the tie rod can be pulled upward and maintained in a taut state. Therefore, in the tie-down system, it is possible to adjust the distortion of the tie rod that may occur due to shrinkage of wood, etc.

[0009] The strain adjustment device according to the second aspect of the present invention comprises: A strain adjustment device for a tie-down system comprising a pair of tie rods inserted in a straight line into a structural body of a building, and a coupler screwed to opposing ends of the pair of tie rods to connect the pair of tie rods, the coupler being rotated in a tightening direction to tighten the coupler, thereby pulling and tensioning the pair of tie rods in opposite directions, an inner cover that engages with a side surface of the coupler; an outer cover disposed outside the inner cover and fixed to a structural frame of the building; a biasing means disposed between the inner cover and the outer cover for applying a rotational force between the outer cover and the inner cover in a direction to rotate the coupler in the fastening direction; Equipped with.

[0010] According to this embodiment, a rotational force in a direction to rotate the coupler in the tightening direction is applied by the biasing means between the outer cover fixed to the building's structural frame and the inner cover engaged with the side of the coupler, so that when the tension of the tie rod loosens due to shrinkage caused by drying of the structural frame, etc., and the tightening of the coupler is about to loosen, the inner cover is automatically rotated together with the coupler in the tightening direction by the biased rotational force in accordance with the loosening that is about to occur. This allows the coupler to continue to be tightened without loosening, and as a result, the pair of tie rods can be kept in a tensioned state by pulling them in opposite directions. Therefore, in the tie-down system, it is possible to adjust the distortion of the tie rod that may occur due to shrinkage of wood, etc.

[0011] A strain adjustment device according to a third aspect of the present invention is the strain adjustment device according to the first or second aspect, The inner cover has an inner circumferential surface that is hexagonal in a plan view.

[0012] According to this embodiment, the inner cover can be easily engaged with a typical nut or coupler having an outer circumferential surface (side surface) that is hexagonal in plan view.

[0013] A strain adjustment device according to a fourth aspect of the present invention is a strain adjustment device according to any one of the first to third aspects, The cover further includes a temporary fastening member that is integrally inserted through a first through hole formed in the inner cover and a second through hole formed in the outer cover, and that temporarily restricts relative rotation between the outer cover and the inner cover.

[0014] According to this aspect, the temporary fastening member can temporarily restrict relative rotation between the outer cover and the inner cover, thereby improving the ease of assembling the strain adjustment device to the tie-down system.

[0015] A strain adjustment device according to a fifth aspect of the present invention comprises: A strain adjustment device for a tie-down system comprising a pair of tie rods inserted in a straight line into a structural body of a building, and a coupler screwed to opposing ends of the pair of tie rods to connect the pair of tie rods, the coupler being rotated in a tightening direction to tighten the coupler, thereby pulling and tensioning the pair of tie rods in opposite directions, A support portion disposed on an outer side of the coupler and fixed to a structural body of the building; a biasing means supported by the support portion and configured to apply a rotational force between the support portion and the coupler in a direction that rotates the coupler in the fastening direction; Equipped with.

[0016] According to this embodiment, a rotational force in a direction to rotate the coupler in the tightening direction is applied by the biasing means between the coupler and the support part fixed to the building's structural frame, so that when the tension of the tie rod loosens due to shrinkage caused by drying of the structural frame or the like, and the tightening of the coupler is about to loosen, the applied rotational force automatically rotates the coupler in the tightening direction to match the loosening that is about to occur. This allows the coupler to continue to be tightened without loosening, and as a result, the pair of tie rods can be maintained in a tensioned state by pulling them in opposite directions. Therefore, in the tie-down system, it is possible to adjust the distortion of the tie rod that may occur due to shrinkage of wood or the like.

[0017] A strain adjustment device according to a sixth aspect of the present invention is the strain adjustment device according to the fifth aspect, The coupling further includes a temporary fastening member having one end engaged with the support portion and the other end engaged with the outer peripheral surface of the coupler, temporarily restricting relative rotation of the coupler with respect to the support portion.

[0018] According to this aspect, the temporary fastening member can temporarily restrict the relative rotation of the coupler with respect to the support portion, improving the workability when assembling the strain adjustment device to the tie-down system.

[0019] A tie-down system according to a seventh aspect of the present invention comprises: The strain adjusting device according to any one of the first to sixth aspects is provided.

[0020] A building according to an eighth aspect of the present invention comprises: A tie-down system according to a seventh aspect is provided. Effect of the Invention

[0021] According to the present invention, in a tie-down system, it is possible to adjust distortion of the tie rod that may occur due to shrinkage of wood, etc. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a building equipped with a tie-down system according to one embodiment. [Diagram 2] FIG. 2 is an enlarged view of the area surrounded by a solid line and marked with the reference character A in the tie-down system shown in FIG. 1, and is a vertical cross-sectional view showing the configuration of the strain adjustment device according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing the configuration of the strain adjustment device according to the first embodiment. [Figure 4] FIG. 4 is an exploded view showing the strain adjustment device according to the first embodiment. [Figure 5A] FIG. 5A is a perspective view showing the configuration of the inner cover. [Figure 5B] FIG. 5B is a perspective view showing the configuration of the main body of the inner cover. [Figure 6] FIG. 6 is a vertical sectional view showing the configuration of a strain adjusting device according to a modified example of the first embodiment. [Figure 7] FIG. 7 is a vertical sectional view showing the configuration of a strain adjusting device according to a modified example of the first embodiment. [Figure 8] FIG. 8 is a diagram for explaining the operation of the distortion adjustment device according to the first embodiment. [Figure 9] FIG. 9 is an enlarged view of the area surrounded by a solid line and marked with the reference character B in the tie-down system shown in FIG. 1, and is a vertical cross-sectional view showing the configuration of a strain adjustment device according to a second embodiment. [Figure 10] FIG. 10 is a diagram for explaining the operation of the distortion adjustment device according to the second embodiment. [Figure 11] FIG. 11 is a vertical sectional view showing the configuration of a strain adjustment device according to the third embodiment. [Figure 12] FIG. 12 is a perspective view showing the configuration of a strain adjustment device according to the third embodiment. [Figure 13] FIG. 13 is a diagram for explaining the operation of the distortion adjustment device according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the drawings used in the following description, the same reference numerals are used for parts that can be configured identically, and duplicated explanations will be omitted. In addition, in each drawing, the scale and the aspect ratio are appropriately changed and exaggerated from those of the actual objects for the convenience of easy understanding of the illustrations.

[0024] (Tie-down system configuration) FIG. 1 is a diagram showing a schematic configuration of a building 100 equipped with a tie-down system 10 according to one embodiment.

[0025] As shown in FIG. 1, a building 100 has a foundation 15, and a structural floor 13 and a structural wall 14 installed on the foundation 15. In the example shown in FIG. 1, the building 100 is a four-story wooden building having four structural floors 13, but the present invention is not limited to this, and may be, for example, a two- or three-story wooden building or a five-story or higher wooden building. In the illustrated example, the foundation 15 is made of a slab footing, but may also be made of a mat footing. The lower end side of an anchor bolt 19 is embedded in the foundation 15, and the upper end side of the anchor bolt 19 protrudes upward from the lowest structural floor 13.

[0026] The tie-down system 10 has a tie rod 11 that is provided to penetrate each story of the building 100, and a plurality of nuts 12 that screw into the tie rod 11 on the structural floor 13 of each story. The tie rod 11 is a member made of, for example, PC steel bar (SBPR) or the like, and is configured by being divided into a plurality of pieces (six in the illustrated example) vertically. A pair of vertically adjacent tie rods 11 are connected to each other via a coupler 18. The lowest tie rod 11 is connected to an anchor bolt 19 via the coupler 18.

[0027] The nuts 12 are screwed onto the tie rods 11 on each structural floor 13, and by rotating the nuts 12 in the tightening direction to tighten them, the tie rods 11 are pulled upward and tensioned, thereby pressing down each structural floor 13. This makes it possible to prevent the structural floors 13 and structural walls 14 from lifting up during typhoons and earthquakes.

[0028] In this embodiment, as shown in FIG. 1, a strain adjustment device 20 according to the first embodiment is attached to each nut 12, and a strain adjustment device 30 according to the second embodiment is attached to at least one coupler 18.

[0029] (First embodiment) Next, the configuration of the strain adjustment device 20 according to the first embodiment will be described.

[0030] Fig. 2 is an enlarged view of the area surrounded by a solid line marked with the reference symbol A in the tie-down system 10 shown in Fig. 1, and is a vertical cross-sectional view showing the configuration of the strain adjustment device 20 according to the first embodiment. Fig. 3 is a horizontal cross-sectional view showing the configuration of the strain adjustment device 20 according to the first embodiment. Fig. 4 is an exploded view showing the strain adjustment device 20 according to the first embodiment.

[0031] 2 to 4, the strain adjusting device 20 according to the first embodiment includes an inner cover 21 that engages with the side surface of the nut 12, an outer cover 22 that is disposed outside the inner cover 21 and fixed to the structural frame of the building 100 (the structural floor 13 in the illustrated example), a biasing means 23 that is disposed between the inner cover 21 and the outer cover 22 and biases a rotational force between the outer cover 22 and the inner cover 21 in a direction that rotates the nut 12 in the tightening direction, and a temporary fastening member 25 that temporarily restricts the relative rotation between the outer cover 22 and the inner cover 21. The inner cover 21 and the outer cover 22 may be formed of a metal such as a unichrome-plated steel plate, or may be formed of a resin.

[0032] FIG. 5A is a perspective view showing the configuration of the inner cover 21, and FIG. 5B is a perspective view showing the configuration of the main body of the inner cover 21. As shown in FIG.

[0033] As shown in Fig. 5A and Fig. 5B, the inner cover 21 has a cylindrical inner cover body 21a having an inner peripheral surface that is hexagonal in plan view, and a lid portion 21b provided to cover the upper end of the inner cover body 21a. The lid portion 21b is provided with a cylindrical circular sleeve having an inner peripheral surface that is circular in plan view, and the tie rod 11 is inserted into the inside of the circular sleeve. The outer edge of the lid portion 21b is fixed to the upper end of the inner cover body 21a, for example, by welding. The inner cover body 21a has an urging means attachment portion 211 on its outer peripheral surface. In the illustrated example, the urging means attachment portion 211 has an L-shaped claw shape in plan view, and the end of the urging means 23 is hooked to the lid portion 21b, making it easy to attach the lid portion 21b.

[0034] In this embodiment, the inner surface of the inner cover main body 21a has a hexagonal shape when viewed in a planar view, making it possible to easily engage the inner cover 21 with a general nut 12 having an outer circumferential surface (side surface) that is hexagonal when viewed in a planar view.

[0035] 4, the outer cover 22 has an outer cover body 22a having a cylindrical body and a ceiling, a fixing plate 22b arranged on the bottom side of the outer cover body 22a, and a connecting means 22c (a screw in the illustrated example) that connects the outer cover body 22a and the fixing plate 22b. As shown in FIG. 3, the fixing plate 22b is provided with a protruding biasing means attachment portion 221, and the biasing means 23 can be easily attached by inserting an end of the biasing means 23 into the biasing means attachment portion 221.

[0036] In this embodiment, as shown in Figures 2 and 3, an anchor plate 16 is fixed onto the structural floor 13, and the fixing plate 22b of the outer cover 22 is fixed onto the anchor plate 16 by an outer cover fixing portion 26 (a screw in the illustrated example).

[0037] As long as the outer cover 22 is fixed to the structural body of the building 100, it is not limited to being fixed to the structural floor 13 (anchor plate 16 on the structural floor 13) as shown in Figures 2 and 3. For example, as shown in Figures 6 and 7, the outer cover 22 may be fixed to the structural wall 14 via mounting brackets 27.

[0038] 2 and 4, in addition to the biasing means 23, an axial runout prevention plate 24 may be disposed between the outer cover 22 and the inner cover 21. The axial runout prevention plate 24 has an annular shape, and its inner edge abuts against the outer peripheral surface of the inner cover main body 23a and its outer edge abuts against the inner peripheral surface of the outer cover main body 22a, thereby preventing axial runout of the strain adjustment device 20.

[0039] A spring, for example, is used as the urging means 23. In the illustrated example, a leaf spring is used as the urging means 23, but the present invention is not limited to this, and a coil spring may be used. The urging means 23 is disposed between the inner cover 21 and the outer cover 22 in a state in which it is deformed so as to urge a rotational force in a direction that rotates the nut 12 in the tightening direction, between the outer cover 22 and the inner cover 21, and one end is fixed to the urging means attachment portion 211 of the inner cover 21, and the other end is fixed to the urging means attachment portion 221 of the outer cover 22.

[0040] In the example shown in Fig. 2 and Fig. 4, the temporary fastening member 25 has a pin shape. In a state in which the biasing means 23 is deformed so as to bias a rotational force between the outer cover 22 and the inner cover 21 in a direction to rotate the nut 12 in the fastening direction, the temporary fastening member 25 is inserted integrally through a first through hole formed in the lid portion 21b of the inner cover 21 and a second through hole formed in the ceiling portion of the outer cover main body 22a, thereby temporarily restricting the relative rotation between the outer cover 22 and the inner cover 21. By temporarily restricting the relative rotation between the outer cover 22 and the inner cover 21 by the temporary fastening member 25, the workability when assembling the strain adjustment device 20 to the tie-down system 10 is improved. When the temporary fastening member 25 is removed from the first through hole of the inner cover 21 and the second through hole of the outer cover 22, the biasing means 23 tries to restore its original shape, and a rotational force is biased between the outer cover 22 and the inner cover 21 in a direction to rotate the nut 12 in the fastening direction.

[0041] According to the strain adjustment device 20 configured as above, referring to Fig. 8, a rotational force in a direction to rotate the nut 12 in the tightening direction is applied by the biasing means 23 between the outer cover 22 fixed to the structural frame of the building 100 (anchor plate 16 on the structural floor 13 in the illustrated example) and the inner cover 21 engaged with the side of the nut 12, so that when a gap is formed between the nut 12 and the structural frame (anchor plate 16 on the structural floor 13 in the illustrated example) due to shrinkage caused by drying of the structural frame, etc., and the tightening of the nut 12 is about to loosen, the inner cover 21 is automatically rotated in the tightening direction together with the nut 12 by the rotational force applied by the biasing means 23 in accordance with the loosening that is about to occur. This allows the nut 12 to continue to be tightened without loosening, and prevents a gap from being formed between the nut 12 and the anchor plate 16. Therefore, since the tie rod 11 can be pulled upward and maintained in a taut state, it is possible to adjust distortion of the tie rod 11 that may occur due to wood shrinkage, etc. in the tie-down system 10.

[0042] Second embodiment Next, the configuration of the strain adjustment device 30 according to the second embodiment will be described.

[0043] FIG. 9 is an enlarged view of the area surrounded by a solid line marked with the symbol B in the tie-down system 10 shown in FIG. 1, and is a vertical cross-sectional view showing the configuration of a strain adjustment device 30 according to a second embodiment.

[0044] As shown in FIG. 9, in the tie-down system 10 according to the present embodiment, a pair of vertically adjacent tie rods 11a, 11b are connected to each other via a coupler 18. A first male thread is formed on the outer peripheral surface of the lower end of the upper tie rod 11a, and a second male thread is formed on the outer peripheral surface of the upper end of the lower tie rod 11b in the opposite direction to the first male thread. A first female thread is formed on the inner peripheral surface of the upper end of the coupler 18, which screws into the first male thread, and a second female thread is formed on the inner peripheral surface of the lower end of the coupler 18, which screws into the second male thread in the opposite direction to the first female thread. When the coupler 18 is rotated in the tightening direction to tighten it, the pair of tie rods 11a, 11b are each drawn into the inside of the coupler 18, whereby the upper tie rod 11a is pulled downward to be tensioned, and the lower tie rod 11b is pulled upward to be tensioned.

[0045] As shown in Figure 9, the strain adjustment device 30 of the second embodiment has an inner cover 31 that engages with the side of the coupler 18, an outer cover 32 that is arranged outside the inner cover 31 and fixed to the structural body of the building 100 (in the illustrated example, the cross beam 14c spanning between the structural walls 14a, 14b), a biasing means 33 that is arranged between the inner cover 31 and the outer cover 32 and applies a rotational force between the outer cover 32 and the inner cover 31 in a direction that rotates the coupler 18 in the tightening direction, an axial runout prevention plate 34 that is arranged so that its inner edge abuts the outer peripheral surface of the inner cover 31 and its outer edge abuts the inner peripheral surface of the outer cover 32, and a temporary fastening member 35 that temporarily restricts relative rotation between the outer cover 32 and the inner cover 31.

[0046] The configuration of each part 31 to 35 in the strain adjustment device 30 of the second embodiment is the same as the configuration of each part 21 to 25 in the strain adjustment device 20 of the first embodiment, except that the inner cover 31 engages with the side of the coupler 18 (instead of the nut 12), and detailed explanations are omitted.

[0047] In this embodiment, the inner peripheral surface of the inner cover 31 has a hexagonal shape when viewed in a plan view, so that the inner cover 31 can be easily engaged with the coupler 18 having an outer peripheral surface (side surface) that is hexagonal when viewed in a plan view.

[0048] In the illustrated example, the outer cover 32 is fixed to the cross rail 14c of the building 100, but the present invention is not limited to this, and although not shown in the figures, the outer cover 22 may be fixed to the structural walls 14a, 14b via mounting brackets (not shown).

[0049] 10, when the temporary fastening member 35 is removed from the first through hole of the inner cover 31 and the second through hole of the outer cover 32, a rotational force in a direction to rotate the coupler 18 in the tightening direction is applied by the biasing means 33 between the outer cover 32 fixed to the structural frame of the building 100 (the horizontal beam 14c in the illustrated example) and the inner cover 31 engaged with the side of the coupler 18, so that when the tension of the tie rods 11a, 11b is loosened due to shrinkage caused by drying of the structural frame, etc., and the tightening of the coupler 18 is about to loosen, the inner cover 31 is automatically rotated together with the coupler 18 in the tightening direction in accordance with the loosening that is about to occur due to the rotational force applied by the biasing means 33. This allows the coupler 18 to continue to be tightened without loosening. Therefore, since the pair of tie rods 11a, 11b can be pulled in opposite directions to be maintained in a tensed state, it is possible to adjust distortion of the tie rods 11a, 11b that may occur due to wood shrinkage, etc. in the tie-down system 10.

[0050] (Third embodiment) Next, the configuration of a distortion adjustment device 300 according to a third embodiment will be described.

[0051] Fig. 11 is a vertical sectional view showing the configuration of a strain adjustment device 300 according to the third embodiment. Fig. 12 is a perspective view showing the configuration of a strain adjustment device 300 according to the third embodiment.

[0052] The strain adjuster 300 according to the third embodiment is a modified example of the strain adjuster 30 according to the second embodiment, and can be used in place of the strain adjuster 30 according to the second embodiment in the tie-down system 10 shown in Fig. 1. Of the configuration of the strain adjuster 300 according to the third embodiment, parts that can be configured similarly to the strain adjuster 30 according to the second embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

[0053] As shown in Figures 11 and 12, the strain adjustment device 300 of the third embodiment comprises a support part 36 that is arranged outside the coupler 18 and fixed to a structural body of the building 100 (structural wall 14 in the illustrated example), and a biasing means 33 that is supported by the support part 36 and applies a rotational force between the support part 36 and the coupler 18 in a direction that rotates the coupler 18 in the tightening direction.

[0054] In the strain adjustment device 300 of the third embodiment, compared to the strain adjustment device 30 of the second embodiment, a support part 36 is used instead of the outer cover 32, the inner cover 31 is omitted, and the biasing means 33 is configured to apply a rotational force directly to the coupler 18 (without passing through the inner cover 31).

[0055] The support part 36 is provided so as to extend horizontally from the structural wall 14 of the building 100, and one end of the biasing means 33 is fixed to and supported by the tip part of the support part 36. The base end part of the support part 36 is fixed to the structural wall 14 by a fixing part 37. The material of the support part 36 is, for example, a metal such as a chromium-plated steel sheet.

[0056] In the example shown in Fig. 11 and Fig. 12, the temporary fastening member 35 has a tip portion having an approximately half-moon shape and a base end portion having a pin shape. The inner edge portion of the tip portion has a shape of a hexagon divided in half, and is capable of engaging with the outer peripheral surface (side surface) of the coupler 18, which is hexagonal in plan view. The base end portion of the temporary fastening member 35 is inserted into a recess formed in the fixing portion 37 of the support portion 36 and is engaged therewith. In a state in which the biasing means 33 is deformed so as to bias a rotational force between the support portion 36 and the coupler 18 in a direction to rotate the coupler 18 in the fastening direction, the tip portion of the temporary fastening member 35 is engaged with the outer peripheral surface (side surface) of the coupler 18 and the base end portion is engaged with the fixing portion 37, whereby the relative rotation of the coupler 18 with respect to the support portion 36 is temporarily restricted. The temporary fastening member 35 temporarily restricts the relative rotation of the coupler 18 with respect to the support portion 36, thereby improving the workability when assembling the strain adjustment device 300 to the tie-down system 10. When the tip end of the temporary fastening member 35 is removed from the outer circumferential surface (side surface) of the coupler 18 and the base end is removed from the recess of the fixing portion 37, the biasing means 33 attempts to restore its original shape, and a rotational force is applied between the support portion 36 and the coupler 18 in a direction that rotates the coupler 18 in the fastening direction.

[0057] According to the strain adjustment device 30 configured as above, referring to FIG. 13, a rotational force in a direction to rotate the coupler 18 in the tightening direction is applied by the biasing means 33 between the support part 36 fixed to the structural frame of the building 100 (structural wall 14 in the illustrated example) and the coupler 18. Therefore, when the tension of the tie rods 11a, 11b is loosened due to shrinkage caused by drying of the structural frame, etc., and the tightening of the coupler 18 is about to loosen, the coupler 18 is automatically rotated in the tightening direction by the rotational force applied by the biasing means 33 in accordance with the loosening that is about to occur. This allows the coupler 18 to continue to be tightened without loosening. Therefore, since the pair of tie rods 11a, 11b can be maintained in a tensioned state by pulling them in opposite directions, it is possible to adjust the strain of the tie rods 11a, 11b that may occur due to shrinkage of wood in the tie-down system 10.

[0058] The above description of the embodiment and the disclosure of the drawings are merely examples for explaining the invention described in the claims, and the invention described in the claims is not limited by the description of the embodiment or the disclosure of the drawings. The components of the above embodiment can be combined in any manner without departing from the spirit of the invention. [Explanation of symbols]

[0059] 10 Tie Down System 100 Buildings 11, 11a, 11b tie rod 12 Nut 13 Structural frame (structural floor) 14, 14a, 14b Structural frame (structural wall) 14c Crosspiece 15 Basics 16 Anchor plate 18 Coupler 20 Strain Adjustment Device 21 Inner cover 211 Urging means mounting portion 21a Inner cover body 21b Lid 22 Outer cover 221 Urging means mounting portion 22a Outer cover body 22b Fixing plate 22c Connecting means 23 Actuation means 24 Anti-vibration plate 25 Temporary fastening material 26 Outer cover fixing part 27 Mounting bracket 30, 300 Strain adjustment device 31 Inner cover 32 Outer cover 33 Actuation means 34 Anti-vibration plate 35 Temporary fastening material 36 Support part 37 Fixed part

Claims

1. A strain adjustment device for a tie-down system having a tie rod inserted into a structural frame of a building and a nut screwed onto the tie rod on the structural frame, the device pulling the tie rod upward and tensioning the tie rod by rotating the nut in a tightening direction to tighten the nut, An inner cover that engages with a side surface of the nut; an outer cover disposed outside the inner cover and fixed to a structural frame of the building; a biasing means for biasing the nut between the inner cover and the outer cover in a direction that rotates the nut in the fastening direction, the biasing means being disposed between the inner cover and the outer cover; A strain adjustment device.

2. A strain adjustment device for a tie-down system comprising a pair of tie rods inserted in a straight line into a structural body of a building, and a coupler screwed to opposing ends of the pair of tie rods to connect the pair of tie rods, the coupler being rotated in a tightening direction to tighten the coupler, thereby pulling and tensioning the pair of tie rods in opposite directions, an inner cover that engages with a side surface of the coupler; an outer cover disposed outside the inner cover and fixed to a structural frame of the building; a biasing means disposed between the inner cover and the outer cover for applying a rotational force between the outer cover and the inner cover in a direction to rotate the coupler in the fastening direction; A strain adjustment device.

3. The strain adjustment device according to claim 1 or 2, wherein the inner cover has an inner peripheral surface that is hexagonal in a plan view.

4. The distortion adjustment device of claim 1 or 2, further comprising a temporary fastening member that is integrally inserted into a first through hole formed in the inner cover and a second through hole formed in the outer cover, and that temporarily restricts relative rotation between the outer cover and the inner cover.

5. A strain adjustment device for a tie-down system comprising a pair of tie rods inserted in a straight line into a structural body of a building, and a coupler screwed to opposing ends of the pair of tie rods to connect the pair of tie rods, the coupler being rotated in a tightening direction to tighten the coupler, thereby pulling and tensioning the pair of tie rods in opposite directions, A support portion disposed on an outer side of the coupler and fixed to a structural body of the building; a biasing means supported by the support portion and configured to apply a rotational force between the support portion and the coupler in a direction that rotates the coupler in the fastening direction; A strain adjustment device.

6. 6. The strain adjusting device according to claim 5, further comprising a temporary fastening member having one end engaged with the support portion and the other end engaged with an outer peripheral surface of the coupler, for temporarily restricting relative rotation of the coupler with respect to the support portion.

7. A tie-down system comprising a strain adjustment device according to any one of claims 1, 2 and 5.

8. A building comprising the tie-down system of claim 7.

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