Tie rod fastening hardware for wooden building

Abstract

To surely prevent a tie rod from floating up even when wood shrinks or the like occurs.SOLUTION: The hardware includes an inner coupler 11 having a male thread portion 11a and a female thread portion 11b that screws onto the male thread portion 24a of a tie rod 24, an outer coupler 12 having a female thread portion 12b that screws onto the male thread portion 11a of the inner coupler 11, a tightening ring 13 having a tie rod through hole 13a, a coil spring 14 whose upper end is fixed to the tightening ring 13 and whose lower end is fixed to the outer coupler 12 and covers the outer surface of the outer coupler 12, and a nut 15 that screws onto the male thread portion 24a of the tie rod 24 above the tightening ring 13. The tightening ring 13 is provided with a bolt hole 13c that passes through to the tie rod through hole 13a, and is provided with a tightening ring fixing bolt 13d that screws into the bolt hole 13c and has a tip that protrudes from the tie rod through hole 13a and abuts against the tie rod 24 to fix the tightening ring 13 to the tie rod 24.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a tie rod fastening hardware for wooden buildings that prevents the tie rods used in wooden buildings from floating up. [Background technology]

[0002] In recent years, wooden buildings have been constructed even for mid- to high-rise buildings. These relatively large wooden buildings often employ a structure in which bearing walls are installed on each floor to withstand horizontal external forces such as earthquakes and wind pressure, and the bearing walls on each floor are connected and reinforced with tie rods. However, in wooden buildings, wood shrinks due to drying or sinking due to the building's own weight. This can create gaps between the nuts and washers that secure the tie rods to the wood, causing the tie rods to lift up. To address this issue, tie rod fastening hardware for wooden buildings has been proposed that absorbs the gaps between the nuts and washers during wood shrinkage and prevents the tie rods from lifting up (see, for example, Patent Document 1, which refers to the tie rod fastening hardware for wooden buildings as a packing).

[0003] This tie rod fastening hardware for wooden buildings prevents the bearing wall from lifting up even when a large pulling force acts on the end of the bearing wall during a typhoon or earthquake, and is highly versatile and easy to install. It consists of an inner cylindrical member that is attached between a wall body through which the tie rod is inserted and a nut attached to the tie rod, through which the tie rod is inserted and has a male screw part formed on its outer periphery, an outer cylindrical member through which the inner cylindrical member is inserted and has a female screw part formed on its inner periphery into which the male screw part screws, and a mating member that connects one of the inner cylindrical member and the outer cylindrical member to the other. The inner tube member has a coil spring that applies a rotational force to rotate the tie rod counterclockwise, and the inner tube member is inserted into the tie rod in an unlocked state. The coil spring is arranged to surround the outer tube member and applies a rotational force in the direction that causes the inner tube member to protrude from the outer tube member. One end of the coil spring is connected to the inner tube member, while the other end is connected to the outer tube member. The coil spring expands in response to the contraction of the wood, and the inner tube member rotates relative to the outer tube member and protrudes from the outer tube member, thereby absorbing the gap between the nut and washer and preventing the tie rod from floating up. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7078773 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the tie rod fastening hardware for wooden buildings in Patent Document 1 mentioned above is configured so that the nut bears the pulling force while the coil spring and the following members of the inner and outer tube members are clamped and tightened between the nut and washer. As a result, the following members located below the nut are subjected to a large load, and the threaded portions of the outer and inner tube members are always in a state of tension, which increases frictional resistance and prevents smooth rotation between the tube member and the inner tube member, resulting in the problem that it may not be possible to prevent the tie rod from floating up.

[0006] Furthermore, although the inner cylindrical member screws onto the outer cylindrical member, no threads are formed on the inner peripheral surface of the inner cylindrical member, so the tie rod does not screw onto it but passes through it, and since the center of the inner cylindrical member is a cylindrical hole with a margin larger than the diameter of the tie rod, it may be installed eccentrically with respect to the tie rod. Therefore, in addition to the frictional resistance caused by the constant tension between the threaded portions of the outer cylindrical member and the inner cylindrical member, when the inner peripheral surface of the inner cylindrical member is placed in contact with the tie rod, the frictional resistance due to contact with the tie rod increases, which may hinder the rotational force that rotates either the outer cylindrical member or the inner cylindrical member relative to each other. This also hinders smooth rotation between the cylindrical member and the inner cylindrical member, which may make it impossible to prevent the tie rod from floating up.

[0007] Therefore, the present invention has been made in consideration of these problems, and aims to provide hardware for tie rods in wooden buildings that can reliably prevent the tie rod from floating up even if wood shrinkage or other issues occur in wooden buildings. [Means for solving the problem]

[0008] In order to solve the above problems, the tie rod fastening hardware for wooden buildings according to the present invention comprises an inner coupler having a male threaded portion on its outer peripheral surface and a female threaded portion that screws into the male threaded portion of a tie rod for wooden buildings; an outer coupler having a female threaded portion that screws into the male threaded portion of the inner coupler; a tightening ring having a tie rod through hole through which the tie rod passes and installed above the inner and outer couplers; a coil spring whose upper end is fixed to the tightening ring and whose lower end is fixed to the outer coupler and is arranged to cover the outer peripheral surface of the outer coupler; and a nut that screws into the male threaded portion of the tie rod above the tightening ring, wherein the tightening ring has a bolt hole that passes from its outer peripheral surface to the tie rod through hole, and a tightening ring fixing bolt that is inserted into the bolt hole and screws into it, with its tip protruding from the tie rod through hole and abutting against the tie rod, thereby fixing the tightening ring to the tie rod. The tie rod fastening hardware according to the present invention is also characterized in that the thread pitch of the male thread portion of the inner coupler is larger than the thread pitch of the female thread portion of the inner coupler. [Effects of the Invention]

[0009] The tie rod fastening hardware for wooden buildings according to the present invention is installed on the beams of a wooden building, the clamping ring is pressed down to compress the coil spring, and the clamping ring is rotated half a turn or one or two turns to apply a torsional force to the coil spring. The clamping ring is then clamped with a nut and fastened to the inner coupler, and the clamping ring fixing bolt is then rotated to secure the tip to the male thread of the tie rod, preventing the clamping ring from loosening. When the beam or column contracts and the beam or column lowers, the coil spring expands and at the same time the outer coupler rotates so that the coil spring is no longer twisted, thereby preventing the tie rod from lifting up. Therefore, with the tie rod fastening hardware for wooden buildings according to the present invention, the coil spring is compressed by pressing down on the clamping ring, and a torsional force is applied to the coil spring by rotating the clamping ring half a turn or one or two turns, and the nut is tightened, and the clamping ring is further fixed to the tie rod with the clamping ring fixing bolt, thereby maintaining the compressed and twisted states of the coil spring, allowing a safe and secure tie rod fastening hardware for wooden buildings to be reliably installed on beams, etc. of wooden buildings. When tightening the nut, the elastic force of the coil spring is hardly exerted, improving the workability of the nut tightening operation. In addition, the outer coupler, which rotates and descends due to the expansion of the coil spring, screws into the inner coupler, and the inner coupler screws into the male thread portion of the tie rod, so that the entire coupler, including the inner coupler and the outer coupler, is installed without being eccentric relative to the tie rod. Therefore, even if the gap between the tie rod fastening hardware for wooden buildings and the washer becomes larger due to shrinkage of the wood, the extension of the coil spring allows the outer coupler to smoothly rotate and descend relative to the inner coupler, allowing the tie rod fastening hardware for wooden buildings to perform its intended function without any problems, thereby reliably and smoothly preventing the tie rod from floating up. Furthermore, because the inner coupler screws into the male threaded portion of the tie rod, the component with the tracking function and the component that bears the load are integrated, and in the initial installation state where the lower end of the inner coupler is pressed against the wood, stress is transmitted in the order from the wooden structure to the inner coupler and then to the tie rod.When the wood sinks, etc., and the tie rod fastening hardware for wooden buildings starts to follow, stress is transmitted in the order from the wooden structure to the outer coupler, inner coupler and then to the tie rod.Compared to conventional technology, there are fewer components in the stress transmission path, making it less likely for malfunctions to occur. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an example of use of a tie rod fastening hardware for wooden construction according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an enlarged perspective view of a main part of part A in FIG. [Figure 3] FIG. 2 is an enlarged front view of a main part of part A in FIG. [Figure 4] 10 is a diagram showing the installation procedure of a tie rod fastening hardware for wooden buildings according to an embodiment of the present invention, showing the state just before the inner coupler is attached to the tie rod. FIG. [Figure 5] This figure shows the installation procedure for an embodiment of a tie rod fastening hardware for wooden buildings according to the present invention, and shows the state just before installation, with the outer coupler, tightening ring, and coil spring connected to the tie rod with the inner coupler attached. [Figure 6] (a) and (b) are figures showing the installation procedure for an embodiment of a tie rod fastening hardware for wooden buildings according to the present invention, respectively. These figures show the state just before the nut is attached after the inner coupler, outer coupler, tightening ring, etc. have been attached to the tie rod, and are partially cross-sectional front views showing the state after the nut has been screwed into the male thread portion of the tie rod. [Figure 7] 1A and 1B are diagrams showing the installation procedure for an embodiment of a tie rod fastening hardware for wooden buildings according to the present invention, each showing the state in which the tightening ring has been lowered to compress the coil spring, and a partial cross-sectional front view showing the state in which the nut has been lowered to the top surface of the lowered tightening ring. [Figure 8] (a) and (b) are diagrams showing the installation procedure for a tie rod fastening hardware for wooden buildings according to an embodiment of the present invention, respectively showing the state in which the tightening ring has been lowered to the compressed state of the coil spring and the nut has been tightened and fixed to the tie rod, and a partial cross-sectional front view showing the operation of the tie rod fastening hardware 1 when the column material is contracted. [Figure 9] 1A and 1B are diagrams showing the procedure for resetting a tie rod fastening hardware for wooden buildings according to an embodiment of the present invention, each of which is a partial cross-sectional front view showing the state in which the tightening ring is lowered again to compress the coil spring, the tightening ring is rotated to twist the coil spring, the nut is lowered again to the top surface of the tightening ring and tightened, and the tightening ring fixing bolt is further tightened and fixed. DETAILED DESCRIPTION OF THE INVENTION

[0011] The following describes an embodiment of the tie rod fastening hardware 1 for wooden buildings according to the present invention. Note that the embodiment of the tie rod fastening hardware 1 for wooden buildings described below is merely one example of the present invention, and the present invention is not limited to the tie rod fastening hardware 1 for wooden buildings according to the embodiment described below, but can be modified as appropriate within the creative scope of the technical concept of the present invention.

[0012] <Configuration of tie rod fastening hardware 1 according to an embodiment of the present invention> The tie rod fastening hardware 1 of an embodiment of the present invention is a hardware that screws into the male thread portion 24a of a tie rod 24 installed between components that make up a wooden building 2, for example, between beams 23, 23 installed above a foundation 21 via pillars 22, as shown in Figures 1 to 3, etc., to prevent the components that make up the wooden building 2 from being pulled out by the tie rod 24, and is composed of an inner coupler 11, an outer coupler 12, a tightening ring 13, a coil spring 14, a nut 15, a washer 16, etc.

[0013] In Figures 2 and 3, the symbol 25 denotes a joint nut (nut tube) that connects the male threaded portions 24a of two tie rods 24 arranged vertically, and is provided with a female threaded portion (not shown) that screws into the male threaded portion 24a of the tie rod 24.

[0014] (Inner coupler 11) As shown in Figures 3 and 4, the inner coupler 11 is a cylindrical nut having a male thread portion 11a on its outer surface and a female thread portion 11b on its inner surface that screws into the male thread portion 24a of the tie rod 24. In this embodiment, the thread pitch P1 of the male thread portion 11a on the outer surface side (see Figures 3 and 4) is larger than the thread pitch P2 of the female thread portion 11b on the inner surface side (see Figure 3), i.e., the thread pitch of the male thread portion 24a of the tie rod 24.

[0015] (Outer Coupler 12) The outer coupler 12 is a nut tube having a female threaded portion 12a that screws into the male threaded portion 11a of the inner coupler 11, and the lower end of its outer surface is provided with a coil spring lower end insertion recess 12b (see Figure 5) into which the lower end 14b of the coil spring 14 is inserted and fixed.

[0016] (Tightening ring 13) As shown in Figure 5, the tightening ring 13 is a disc-shaped ring provided with a tie rod through-hole 13a through which the tie rod 24 passes, and its outer surface is provided with a coil spring upper end insertion recess 13b into which the upper end 14a of the coil spring 14 is inserted and fixed, and is provided on the upper part of the coil spring 14.

[0017] As shown in Figure 5, the tightening ring 13 is provided with a bolt hole 13c that extends perpendicular to the tie rod through-hole 13a, i.e., that penetrates from the outer surface of the tightening ring 13 to the tie rod through-hole 13a. The bolt shank 13d1 of the tightening ring fixing bolt 13d is threaded into the bolt hole 13c, and when the tightening ring fixing bolt 13d is rotated, the tip of the bolt shank 13d1 protrudes into the tie rod through-hole 13a and abuts against the male thread portion 24a of the tie rod 24, thereby fixing the tightening ring 13 to the tie rod 24.

[0018] (coil spring 14) As shown in Figure 5 and other figures described below, the coil spring 14 has its upper end 14a inserted into the coil spring upper end insertion recess 13b of the tightening ring 13, while its lower end 14b is inserted into the coil spring lower end insertion recess 12b of the outer coupler 12, and is arranged to cover the entire outer circumference of the outer coupler 12.

[0019] (Nut 15) Nut 15 is a nut that screws onto male thread portion 24a of tie rod 24 above tightening ring 13, and in this embodiment, it is a member that serves to prevent loosening of tightening ring 13. Therefore, it is not required to have high tensile strength, and a low-strength nut may be used.

[0020] (Washer 16) The washer 16 is used when the tie rod fastening hardware 1 is attached to the base 21, beam 23, etc., and the lower end of the outer coupler 12 abuts on it.

[0021] <Function of the tie rod fastening hardware 1 according to the embodiment of the present invention> Next, the operation of the tie rod fastening hardware 1 according to the embodiment of the present invention configured as above will be described.

[0022] (Installation of tie rod fastening hardware 1) First, as shown in Figure 4, the tie rod 24 is passed through the through hole 23a that penetrates the beam 23 from top to bottom and protrudes upward, and a washer 16 is passed through it and lowered to the top surface of the beam 23.Next, the inner coupler 11 is lowered and the tie rod 24 is passed through the inner coupler 11, and the female thread portion 11b (see Figure 3) of the inner coupler 11 is screwed into the male thread portion 24a of the tie rod 24.Then, as shown in Figure 5, the inner coupler 11 is rotated and lowered until the lower end of the inner coupler 11 abuts the top surface of the washer 16, and the inner coupler 11 is fixed to the beam 23 via the washer 16.

[0023] As shown in Figure 5, when the lower end of the inner coupler 11 abuts against the upper surface of the washer 16, the tightening ring 13 and the outer coupler 12 are connected and integrated via the coil spring 14 in advance, and then the inner coupler 11 is lowered toward the upper end of the male thread portion 24a of the tie rod 24.

[0024] Then, first the tie rod 24 passes through the outer coupler 12, and the female threaded portion 12a of the outer coupler 12 screws into the male threaded portion 11a of the inner coupler 11 which was screwed into the male threaded portion 24a of the tie rod 24. Then, the worker rotates the outer coupler 12, the tightening ring 13 and the coil spring 14 and lowers the outer coupler 12 until its lower end abuts the upper surface of the washer 16, as shown in Figure 6(a).

[0025] At this time, although the female thread portion 12a of the outer coupler 12 is threaded into the male thread portion 11a of the inner coupler 11, the tightening ring 13 only passes through the tie rod 24 and is not threaded into the male thread portion 24a of the tie rod 24, so the coil spring 14 is not in a compressed state.

[0026] Then, as shown in Figure 6(a), the nut 15 is lowered from above the tightening ring 13 onto the upper end of the male thread portion 24a of the tie rod 24, and the nut 15 is rotated to screw into the male thread portion 24a of the tie rod 24 as shown in Figure 6(b).

[0027] In this embodiment, as shown in Figure 7(a), an operator directly presses down on the clamping ring 13 to compress the coil spring 14, and then rotates and lowers the nut 15, and as shown in Figure 7(b), threads and moves the nut 15 to an extent that it does not interfere with the clamping ring 13, bringing it closer to the upper surface of the clamping ring 13. It is also possible to abut the nut 15 against the upper surface of the clamping ring 13 and rotate the nut 15 to lower the clamping ring 13 and compress the coil spring 14, but in this case the nut 15 would receive the elastic force of the coil spring 14 as a reaction force via the clamping ring 13, which would worsen workability, so the clamping ring 13 is pressed down to compress the coil spring 14.

[0028] Therefore, when the coil spring 14 is compressed, the elastic force of the coil spring 14 hardly acts in the direction of tightening the nut 15, so that the workability of tightening the nut 15 can be improved.

[0029] After compressing the coil spring 14, the tightening ring fixing bolt 13d provided on the tightening ring 13 is grasped as a handle, or the tightening ring 13 is grasped directly, and the tightening ring 13 is rotated half a turn or one or two turns relative to the tie rod 24 to twist the coil spring 14, and the restoring force (elastic force) of the coil spring 14 in the twisted state applies a rotational force that rotates the outer coupler 12 relative to the inner coupler 11.

[0030] Once the compression and twisting of the coil spring 14 is complete, the worker clamps the tightening ring 13 with the nut 15 and tightens it to the inner coupler 11 while maintaining the tightening ring 13 in its compressed and twisted state as shown in Figure 8(a). Then, the tightening ring fixing bolt 13d is rotated to fix the tip to the male thread portion 24a of the tie rod 24, preventing the tightening ring 13 from loosening.

[0031] This fixes the inner coupler 11, tightening ring 13, and nut 15 to the tie rod 24, completing the installation of the tie rod fastening hardware 1 of this embodiment, and preparing for the descent of the beam material 23 on which the tie rod fastening hardware 1 of this embodiment is installed due to shrinkage of the column material 22, etc.

[0032] <Operation of tie rod fastening hardware 1 when beam 23 is lowered> After the installation of the tie rod fastening hardware 1 of this embodiment is complete, the wood shrinks due to changes over time such as drying of the wood in the pillar material 22 and beam material 23 and sinking due to the weight of the building itself, and as shown in Figure 8(b), the beam material 23 on which the tie rod fastening hardware 1 is installed sinks by an amount α as indicated by the arrow.As the tightening ring 13 is fixed to the tie rod 24, it does not move from its initial installation position, and the coil spring 14 expands due to its restoring force in an attempt to return to its original shape from its compressed and twisted state, rotating the lower end 14b of the coil spring 14 so that the twisted state is eliminated, and the outer coupler 12 fixed to the lower end 14b of the coil spring 14 rotates relative to the inner coupler 11.

[0033] Then, the outer coupler 12 rotates relative to the inner coupler 11, causing the outer coupler 12 to descend as shown in Figure 8(b), pressing the washer 16 against the beam 23 and following the sinking of the beam 23 on which the tie rod fastening hardware 1 is installed.

[0034] As a result, even if the beam material 23 on which the tie rod fastening hardware 1 is installed drops as shown in Figure 8(b) due to shrinkage of the column material 22 (see Figure 1, etc.), and the gap between the nut 15 and the washer 16 widens, the restoring force (elastic force) of the coil spring 14, which is in a compressed and twisted state, causes the outer coupler 12 to rotate and drop relative to the inner coupler 11, following the drop of the washer 16 and preventing the tie rod 24 from floating up.

[0035] (Resetting of tie rod fastening hardware 1> As described above, when the beam 23 on which the tie rod fastening hardware 1 is installed sinks, the tie rod fastening hardware 1 operates, and the restoring force of the coil spring 14, which is in a compressed and twisted state, causes the outer coupler 12 to rotate and descend, pushing down the washer 16 and preventing the tie rod 24 from floating up.However, the compressed and twisted states of the coil spring 14 weaken or disappear, and the tie rod fastening hardware 1 will no longer operate normally when the beam 23 sinks further.

[0036] Therefore, when the tie rod fastening hardware 1 operates normally as shown in FIG. 8(b), the worker resets it.

[0037] Specifically, during inspection, etc., when the tightening ring fixing bolt 13d of the tightening ring 13 of the tie rod fastening hardware 1 that is operating normally and has weakened or no longer been compressed or twisted as shown in Figure 8(b), the worker first loosens it by rotating it in the reverse direction as shown in Figure 9(a), loosens the nut 15, and frees the tightening ring 13 that was fixed to the tie rod 24.The worker then rotates and tightens the inner coupler 11 and outer coupler 12 again to approximately the sinking amount α of the beam material 23 (see Figure 8(b)), pushing down the tightening ring 13 to compress the coil spring 14, and also rotates the tightening ring 13 half a turn or one or two turns relative to the tie rod 24 to twist the coil spring 14 and apply the rotational force of the outer coupler 12.

[0038] Thereafter, as in the case of installing the tie rod fastening hardware 1 described above, the nut 15 is tightened and abutted against the inner coupler 11 while clamping the tightening ring 13 as shown in Figure 9(b), and then the tightening ring fixing bolt 13d is rotated to fix the tip to the male thread portion 24a of the tie rod 24, thereby completing the resetting of the tie rod fastening hardware 1 and making it possible to accommodate further sinking of the beam material 23 on which the tie rod fastening hardware 1 is installed.

[0039] <Summary of tie rod fastening hardware 1 according to an embodiment of the present invention> As described above, the tie rod fastening hardware 1 for wooden construction according to the embodiment of the present invention includes the inner coupler 11 having the male thread portion 11a on its outer circumferential surface and the female thread portion 11b on its inner circumferential surface that screws onto the male thread portion 24a of the tie rod 24, the outer coupler 12 having the female thread portion 12b that screws onto the male thread portion 11a of the inner coupler 11, the tightening ring 13 provided with the tie rod through hole 13a through which the tie rod 24 passes, the nut 15 that fixes the tightening ring 13, and the tightening ring 13. 3 and its lower end is fixed to the outer coupler 12, and is provided with a coil spring 14 arranged to cover the outer peripheral surface of the outer coupler 12, and the tightening ring 13 is provided with a bolt hole 13c that passes through the outer peripheral surface to the tie rod through hole 13a, and the bolt hole 13c is provided with a tightening ring fixing bolt 13d whose tip protrudes from the tie rod through hole 13a and abuts against the tie rod 24, thereby fixing the tightening ring 13 to the tie rod 24.

[0040] Therefore, by installing the tie rod fastening hardware 1 for wooden buildings of an embodiment of the present invention on a beam 23 of a wooden building, as shown in Figures 1 and 2, for example, and compressing the coil spring 14 by pushing down the tightening ring 13, and then rotating the tightening ring 13 half a turn or one or two turns to apply a torsional force to the coil spring 14, and then tightening the nut 15, and further fixing the tightening ring 13 to the tie rod 24 with the tightening ring fixing bolt 13d, when the beam 23 on which the tie rod fastening hardware 1 for wooden buildings is installed sinks, the coil spring 14 expands and at the same time the outer coupler 12 is rotated so that the torsion of the twisted coil spring 14 is eliminated, thereby preventing the tie rod 24 from floating up.

[0041] Furthermore, the outer coupler 12, which rotates and descends due to the expansion of the coil spring 14, screws into the inner coupler 11, and the inner coupler 11 screws into the male thread portion 24a of the tie rod 24, so that the entire coupler, the inner coupler 11 and the outer coupler 12, is installed without being eccentric with respect to the tie rod 24. Therefore, even if the beam 23 sinks or the like and the gap between the tie rod fastening hardware 1 for wooden buildings and the washer 16 increases, the outer coupler 12 can smoothly rotate and descend relative to the inner coupler 11 due to the expansion of the coil spring 14, and the tie rod fastening hardware 1 for wooden buildings of the embodiment can perform its intended function without any problems, thereby reliably preventing the tie rod 24 from floating up.

[0042] In particular, in the tie rod fastening hardware 1 for wooden buildings according to the embodiment of the present invention, the inner coupler 11 has a male threaded portion 11a that screws into the female threaded portion 12a of the outer coupler 12, and also has a female threaded portion 11b that screws into the male threaded portion 24a of the tie rod 24, and the upper end of the coil spring 14 is fixed to the tightening ring 13, so that the constant tension at the threaded portion between the outer coupler 12 and the inner coupler 11 is reduced, thereby reducing the frictional resistance between the outer coupler 12 and the inner coupler 11 and maintaining smooth rotation.

[0043] Furthermore, unlike the conventional tie rod hardware for wooden buildings described in Patent Document 1 above, the tie rod fastening hardware 1 for wooden buildings according to the embodiment of the present invention has a female thread portion 11b on the inner surface of the inner coupler 11 that screws into the male thread portion 24a of the tie rod 24. This prevents the inner coupler 11 from being installed eccentrically relative to the tie rod 24, and in addition to the frictional resistance that occurs when the threaded portions of the outer coupler 12 and inner coupler 11 are always in contact with each other, there is also no increase in frictional resistance that occurs when the inner coupler 11 comes into contact with the tie rod 24 at an angle, so the outer coupler 12 can rotate smoothly relative to the inner coupler 11.

[0044] Furthermore, unlike the conventional tie rod hardware for wooden buildings described in Patent Document 1, the inner circumferential surface of the inner coupler 11 has a female thread 11b that threads onto the male thread 24a of the tie rod 24. Therefore, the female thread 11b of the inner coupler 11 threads onto the male thread 24a of the tie rod 24, integrating the component with the follower function and the component that bears the load. Therefore, in the initial installation state where the lower end of the inner coupler 11 is pressed against the beam 23 via the washer 16, stress is transmitted from the beam 23 to the inner coupler 11 and the tie rod 24 in that order. When the beam 23 sinks, causing the outer coupler 12, coil spring 14, etc. to follow, the stress is transmitted from the beam 23 to the outer coupler 12, the inner coupler 11, and the tie rod 24 in that order. Therefore, compared to the conventional technology described in Patent Document 1, the number of components in the stress transmission path is reduced, making it less likely for malfunctions to occur. Moreover, even when the beam 23 follows, the stress can be transmitted at a position as close as possible to the beam 23.

[0045] In addition, in the tie rod fastening hardware 1 for wooden buildings according to the embodiment of the present invention, the thread pitch P1 of the male thread portion 11a on the outer circumferential surface of the inner coupler 11 is formed to be larger than the thread pitch P2 of the female thread portion 11b of the inner coupler 11.

[0046] Therefore, since the thread pitch P1 of the male thread portion 11a on the outer peripheral surface of the inner coupler 11 is different from the thread pitch P2 of the female thread portion 11b, the threaded portions of the outer coupler 12 and the inner coupler 11 are less likely to be in a constant state of tension, and the frictional resistance between the outer coupler 12 and the inner coupler 11 is reduced, thereby maintaining smooth rotation of the outer coupler 12, etc.

[0047] In the above embodiment, the tie rod fastening hardware 1 for wooden buildings is connected to the tie rod 24 that passes through the beam 23 joined to the column 22 of the wooden building 2 as shown in Figure 1, but the present invention is not limited to this, and when the tie rod 24 is provided for wood other than the beam 23, such as a foundation 21 or rafters, or between the columns 22, 23, the tie rod fastening hardware 1 for wooden buildings may be installed on the column 22. The tie rod 24 also includes anchor bolts extending from the foundation, etc. [Explanation of symbols]

[0048] 1...Tie rod fastening hardware for wooden buildings 11...Inner coupler 11a…Male thread part 11b...Female thread 12...Outer coupler 12a...Female thread 12b... Coil spring lower end insertion recess 13...Tightening ring 13a...Tie rod through hole 13b... Coil spring upper end insertion recess 13c...Bolt hole 13d...Tightening ring fixing bolt 14...Coil spring 14a...Top end 14b…lower end 15...Nut 16...Washer 2 Wooden buildings 21...Base 22...Column material 23…Beam material 24...Tie rod 24a...Male thread

Claims

1. an inner coupler having a female thread portion that screws into a male thread portion of a tie rod for a wooden building and having a male thread portion on an outer circumferential surface; an outer coupler having a female thread portion that screws into the male thread portion of the inner coupler; a tightening ring having a tie rod through-hole for passing the tie rod therethrough and installed above the inner coupler and the outer coupler; a coil spring having an upper end fixed to the fastening ring and a lower end fixed to the outer coupler, the coil spring being provided so as to cover an outer peripheral surface of the outer coupler; a nut that is threaded onto the male thread portion of the tie rod above the tightening ring, The tightening ring has a bolt hole that passes through its outer surface to the tie rod through hole, and a tightening ring fixing bolt is provided that is inserted into the bolt hole and screwed into it, and its tip protrudes from the tie rod through hole and abuts against the tie rod, thereby fixing the tightening ring to the tie rod.This is a tie rod tightening hardware for wooden buildings.

2. 2. The tie rod fastening hardware according to claim 1, A tie rod fastening hardware for wooden construction, characterized in that the thread pitch of the male thread portion of the inner coupler is larger than the thread pitch of the female thread portion of the inner coupler.

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