Installation method for bolt fasteners and bolts for shear reinforcement

Abstract

This invention provides a bolt fastener that allows for the simple and easy addition of a structure to wooden buildings that can withstand horizontal shear forces during earthquakes, and that prevents the bolts used from loosening, as well as a method for installing bolts for shear reinforcement using the same. [Solution] The bolt fastener 5 has a cylindrical body 51 which is press-fitted into the upper end of the through hole in the foundation through which the shear reinforcement bolt is inserted, and which has a female threaded portion formed on its inner circumference that can be screwed with the bolt, and a protruding portion 52 which is formed on the lower side of the outer circumference of the body 51 and extends at least in the vertical direction, and which bites into the inner circumference of the through hole when the body 51 is press-fitted into the foundation. By using this bolt fastener 5, shear reinforcement bolts can be installed in existing foundations and bases with simple work.

Description

Technical Field

[0001] The present invention relates to a bolt fixture and a method for installing a bolt for shear reinforcement.

Background Art

[0002] A wooden building is known that includes a foundation made of concrete, a base made of wood disposed above the foundation, a plurality of anchor bolts embedded in the foundation and inserted through through-holes of the base, and nuts screwed onto upper ends of the respective anchor bolts (see Patent Document 1). In this type of wooden building, each anchor bolt bears the horizontal shear force during an earthquake. Therefore, if the wooden building is to be continuously used when the anchor bolt is damaged by an earthquake or the like, or when the number of anchor bolts is small in an old wooden building, it is desirable to add a structure that bears the horizontal shear force during an earthquake.

[0003] As an additional means of supporting structures that bear horizontal shear forces, the installation of additional anchor bolts can be considered. As a method for installing additional anchor bolts while leaving the wooden building in place, an anchor bolt installation method using a kit consisting of post-installed anchor bolts, fixing agent, hexagonal nuts, square washers, and flat washers is known (see Non-Patent Literature 1). In this installation method, first, additional through holes for the anchor bolts are formed in the sill, then additional fixing holes for the anchor bolts are formed in the foundation, and the fixing agent is loaded into the fixing holes through the through holes. Then, two hexagonal nuts are tightened and fixed with a flat washer sandwiched between the upper end of the post-installed anchor bolt, and the lower end of the post-installed anchor bolt is inserted through the through hole into the fixing hole while rotating it using a box socket. At this time, since the lower end of the post-installed anchor bolt is cut at an angle, the tubular fixing agent bag is broken, and the agent inside is mixed and filled into the fixing hole. After the fixing agent has solidified, remove the flat washer and each hexagonal nut from the upper end of the post-installed anchor bolt, insert the square washer onto the upper end of the post-installed anchor bolt, and place it on the base, then tighten the hexagonal nut. This allows the material to be mixed and filled in the fixing hole without the screw spinning freely, and the double hexagonal nut provides a function to prevent loosening of the post-installed anchor bolt and hexagonal nut. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 7018550 [Non-Patent Document 1] AIM Co., Ltd., "Foundation Post-Installation Anchor Kit - Instruction Manual", [Online], [Retrieved August 27, 2024], Internet <https: / / www.aimkk.com / dcms_media / other / dodaianka.pdf> [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] However, the anchor bolt installation method described in Non-Patent Document 1 has the problem that, in order to operate it using a box socket, two hexagonal nuts are tightened onto the anchor bolt with a flat washer in between, and after the fixing agent hardens, each hexagonal nut and flat washer are removed, and the hexagonal nuts are tightened again to secure them to the anchor bolt, which makes the work extremely complicated. In addition, if a large torque is applied to the anchor bolt after installation, there is a risk that loosening may occur due to insufficient hardening of the fixing agent.

[0006] The present invention aims to provide a bolt fastener that can easily and simply add a structure to wooden buildings that can withstand horizontal shear forces during earthquakes, and that can make the bolts used less likely to loosen, as well as a method for installing bolts for shear reinforcement using the same. [Means for solving the problem]

[0007] To achieve the above objective, the present invention provides: A cylindrical body is pressed into the upper end of the through-hole in the base through which the bolt is inserted, and has a female threaded portion formed on its inner circumference that can be screwed with the bolt, A bolt fastener is provided having a projection formed on the lower side of the outer circumferential surface of the main body, extending at least in the vertical direction, which bites into the inner circumferential surface of the insertion hole when the main body is pressed into the base by impact.

[0008] In the above bolt fastener, It is preferable that the main body has a flange portion that extends radially outward from the upper end and contacts the upper surface of the base when pressed into the through hole.

[0009] In the above bolt fastener, The bolt fastener according to claim 2, wherein the flange portion has a protrusion on its lower surface for preventing rotational loosening.

[0010] In the above bolt fastener, Preferably, the main body has a general portion with a substantially constant outer diameter and a small-diameter portion formed at the lower end and having a smaller outer diameter than the general portion.

[0011] In the above bolt fastener, The aforementioned protruding portion is formed at an inclination with respect to the axial direction of the main body, The main body is pressed into the insertion hole by impact while rotating in a predetermined rotational direction around its central axis. Preferably, the predetermined rotation direction is the same direction in which the main body loosens relative to the bolt.

[0012] Furthermore, the present invention provides a method for installing bolts for shear reinforcement using the above-mentioned bolt fastener, The process of drilling holes in the base to form through holes for bolts, The process of drilling holes in the foundation to form insertion holes for bolts, A method for installing bolts for shear reinforcement is provided, comprising a fastener press-fitting step of press-fitting the bolt fastener into the through-hole of the base.

[0013] In the above method for installing bolts for shear reinforcement, Prior to the press-fitting step of the fastener, there is an assembly step of assembling a bolt assembly in which the bolt fastener is screwed onto the upper end of the bolt, The process includes a bolt positioning step of setting the bolt assembly onto the base so that the bolt is inserted into the through hole and the insertion hole, In the aforementioned fastener press-fitting process, it is preferable to press-fit the bolt fastener into the through hole by striking the bolt assembly.

[0014] In the above method for installing bolts for shear reinforcement, The aforementioned bolt is a fully threaded bolt without a head. In the assembly process described above, the bolt fastener and nut may be screwed onto the upper end of the bolt.

[0015] In the above method for installing bolts for shear reinforcement, The bolt used may have a head at its upper end. [Effects of the Invention]

[0016] According to the present invention, a structure for bearing the horizontal shear force during an earthquake can be easily added to a wooden building, and the bolts used can be made difficult to loosen.

Brief Description of the Drawings

[0017] [Figure 1] It is a partial cross-sectional explanatory view of a wooden building showing an embodiment of the present invention. [Figure 2] It is a flowchart of a method for installing bolts for shear reinforcement. [Figure 3] It is a side view of a bolt for shear reinforcement. [Figure 4] It is a side view of a nut. [Figure 5] It is a top view of a nut. [Figure 6] It is a side view of a washer. [Figure 7] It is a top view of a washer. [Figure 8] It is a side view of a bolt fixture. [Figure 9] It is a top view of a bolt fixture. [Figure 10] It is a bottom view of a bolt fixture. [Figure 11] It is a partial cross-sectional explanatory view of a wooden building in a state where an insertion hole is formed in the foundation after a through hole is formed in the base. [Figure 12] It is a cross-sectional view of a bolt assembly. [Figure 13] It is a partial cross-sectional explanatory view of a wooden building in a state where a bolt assembly is set on the base. [Figure 14] It is a partial cross-sectional explanatory view of a wooden building in a state where a bolt fixture is press-fitted into a through hole. [Figure 15] It is a side view of a bolt for shear reinforcement showing a modified example. [Figure 16] It is a top view of a bolt for shear reinforcement showing a modified example. [Figure 17] It is a cross-sectional view of a bolt assembly showing a modified example. [Figure 18] This is a modified example, a partial cross-sectional diagram illustrating a wooden building with the bolt assembly set on the foundation. [Figure 19] This is a modified example, a partial cross-sectional diagram illustrating a wooden building in which shear reinforcement bolts are screwed into bolt fasteners. [Figure 20] This is a modified example and a flowchart showing the method for installing bolts for shear reinforcement. [Figure 21] This is a modified example, a partial cross-sectional diagram illustrating a wooden building with a bolt fastener pressed into a through-hole. [Modes for carrying out the invention]

[0018] Figures 1 to 14 show one embodiment of the present invention, with Figure 1 being a partial cross-sectional explanatory diagram of a wooden building. Figure 2 is a flowchart of the method for installing bolts for shear reinforcement, Figure 3 is a side view of a bolt for shear reinforcement, Figure 4 is a side view of a nut, Figure 5 is a top view of a nut, Figure 6 is a side view of a washer, Figure 7 is a top view of a washer, Figure 8 is a side view of a bolt fastener, Figure 9 is a top view of a bolt fastener, Figure 10 is a bottom view of a bolt fastener, Figure 11 is a partial cross-sectional explanatory diagram of a wooden building in a state where a through hole has been formed in the sill and an insertion hole has been formed in the foundation, Figure 12 is a cross-sectional view of a bolt assembly, Figure 13 is a partial cross-sectional explanatory diagram of a wooden building in a state where the bolt assembly has been set in the sill, and Figure 14 is a partial cross-sectional explanatory diagram of a wooden building in a state where the bolt fastener has been pressed into the through hole.

[0019] As shown in Figure 1, this wooden building 1 has a concrete foundation 2, a wooden base 3, shear reinforcement bolts 4 inserted into insertion holes 21 in the foundation 2 and through holes 31 in the base 3, and bolt fasteners 5 provided in the through holes 31 of the base 3 that screw into the bolts 4. The bolts 4 and bolt fasteners 5 shown in Figure 1 are installed in addition to the existing foundation 2 and base 3. In this embodiment, this wooden building 1 further has a nut 6 that screws into the upper end of the bolt 4, and a washer 7 (see Figure 14) through which the bolt 4 is inserted and interposed between the bolt fastener 5 and the nut 6. In this embodiment, a packing 8 is interposed between the foundation 2 and the base 3, and a gap is formed between the foundation 2 and the base 3 equal to the thickness of the packing 8. Note that a configuration without packing 8 between the foundation 2 and the base 3 is also possible. The method of installing the bolts 4 using the bolt fasteners 5 to the existing foundation 2 and base 3 will be described below.

[0020] As shown in Figure 2, the method for installing the shear reinforcement bolt 4 includes a base drilling step S1 in which through holes 31 for the bolt 4 are formed in the base 3, a foundation drilling step S2 in which insertion holes 21 for the bolt 4 are formed in the foundation 2, an insertion hole cleaning step S3 in which the inside of the insertion hole 21 is cleaned, an assembly assembly step S4 in which a bolt assembly 9 consisting of a bolt 4, a bolt fastener 5, a nut 6 and a washer 7 is assembled, a bolt positioning step S5 in which the bolt assembly 9 is set on the base 3 so that the bolt 4 is inserted into the through hole 31 and the insertion hole 21, a fastener press-fitting step S6 in which the bolt fastener 5 of the bolt assembly 9 is pressed into the through hole 31 of the base 3 by impact, and a nut loosening adjustment step S7 in which the loosening of the nut 6 is adjusted.

[0021] As shown in Figure 3, the additional shear reinforcement bolt 4 is made of metal and has a male thread 41 formed along its entire length. In this embodiment, the bolt 4 is a fully threaded bolt without a head. The material of the bolt 4 is arbitrary and may be engineering plastic, for example. Also, the male thread 41 of the bolt 4 does not have to be formed along its entire length, but it is sufficient if it is formed at least in the portion necessary for screwing it into the bolt fastener 5. The dimensions of the bolt 4 are arbitrary, but in this embodiment, it is a so-called M12 bolt, with an outer diameter of the male thread 41 of 12 mm and a length of 150 mm. The length of the bolt 4 should be determined considering the thickness of the base 3.

[0022] As shown in Figures 4 and 5, the nut 6 is made of metal and has a regular hexagonal shape when viewed in the axial direction. The material of the nut 6 is arbitrary and may be engineering plastic, for example. In this embodiment, the nut 6 is a so-called M12 nut.

[0023] As shown in Figures 6 and 7, the washer 7 is made of metal and has a circular outer shape when viewed in the axial direction. The material of the washer 7 is arbitrary and may be engineering plastic, for example. In this embodiment, the washer 7 is a so-called M12 washer.

[0024] As shown in Figure 8, the additionally provided bolt fastener 5 is made of, for example, engineering plastic and has a cylindrical body 51 with a female threaded portion (see Figure 9) formed on its inner circumferential surface that can be screwed into the bolt 4, a protruding portion 52 formed on the lower side of the outer circumferential surface of the body 51 that extends at least vertically, and a flange portion 53 extending radially outward from the upper end of the body 51. The material of the bolt fastener 5 is arbitrary and can be, for example, metal. The body 51 has a general portion 54 with a substantially constant outer diameter and a small diameter portion 55 formed on the lower end side that has a smaller outer diameter than the general portion 54. In this embodiment, since a demolding taper is formed on the outer circumferential surface of the general portion 54, the outer diameter of the general portion 54 is not strictly constant. Also, in this embodiment, the small diameter portion 55 is formed to narrow downwards. The dimensions of the bolt fastener 5 are arbitrary, but in this embodiment, the outer diameter of the general part 54 of the main body 51 is 24 mm, the outer diameter of the lower end of the small diameter part 55 of the main body 51 is 22 mm, and the outer diameter of the flange part 53 is 28 mm. In addition, in this embodiment, the vertical dimension of the general part 54 of the main body 51, including the flange part 53, is 28 mm, and the vertical dimension of the small diameter part 55 is 5 mm.

[0025] As shown in Figure 9, the upper ends of the main body 51 and the flange portion 53 are formed to be substantially flat. The flange portion 53 contacts the upper surface of the base 3 when the main body 51 is pressed into the through hole 31. As shown in Figure 5, the flange portion 53 has a projection 56 on its lower surface for preventing rotational loosening. Multiple projections 56 are formed at intervals in the circumferential direction of the main body 51. In this embodiment, four projections 56 are arranged at equal intervals in the circumferential direction.

[0026] As shown in Figure 10, multiple protrusions 52 are formed at intervals in the circumferential direction of the main body 51. In this embodiment, four protrusions 52 are arranged at equal intervals in the circumferential direction. As shown in Figure 5, each protrusion 52 is formed at an inclination with respect to the axial direction of the main body 51, and as a result, the main body 51 rotates in a predetermined rotational direction around its central axis while being press-fitted into the through hole 31. The predetermined rotational direction is the same direction in which the main body 51 loosens relative to the bolt 4, and in this embodiment, it is clockwise when viewed from above. In this embodiment, the protrusions 52 are formed in a range of 20 mm from the lower end of the main body 51 in the vertical direction. In addition, in this embodiment, the range in the vertical direction where neither the protrusions 52 nor the flange portion 53 are formed on the main body 51 is 8 mm.

[0027] As shown in Figure 11, when installing additional shear reinforcement bolts 4, first a through hole 31 is formed in the base 3 (base drilling step S1), and then an insertion hole 21 is formed in the foundation 2 (foundation drilling step S2). The through hole 31 in the base 3 is formed using, for example, a woodworking drill. The diameter of the through hole 31 is arbitrary, but in this embodiment it is 24 mm. The insertion hole 21 in the foundation 2 is formed using, for example, a hammer drill. The depth and diameter of the insertion hole 21 are arbitrary, but in this embodiment the depth is 50 mm and the diameter is 14 mm. After this, the drilling debris generated during the formation of the through hole 31 and the insertion hole 21 is discharged from the insertion hole 21 (insertion hole cleaning step S3). The drilling debris from the insertion hole 21 is discharged using, for example, a blower and brush.

[0028] Furthermore, as shown in Figure 12, separate from the base hole drilling process S1, the foundation hole drilling process S2, and the insertion hole cleaning process S3, a bolt assembly 9 consisting of a bolt 4, a bolt fastener 5, a nut 6, and a washer 7 is assembled (assembly assembly process S4). Specifically, the bolt fastener 5 is screwed onto the upper end of the bolt 4, and the washer 7 is inserted further above the bolt fastener 5, with the nut 6 then screwed on to form the bolt assembly 9.

[0029] Then, as shown in Figure 13, the bolt assembly 9 is set on the base 3 so that the bolt 4 is inserted into the through hole 31 and the insertion hole 21 (bolt positioning step S5). At this time, even if the position where the through hole 21 is formed is off from the intended position, the worker can change the lower end position of the bolt assembly 9 to find the position where the lower end of the bolt 4 enters the insertion hole 21. Therefore, the lower end of the bolt 4 can be reliably inserted into the insertion hole 21.

[0030] After setting the bolt assembly 9 onto the base 3, the bolt fastener 5 of the bolt assembly 9 is pressed into the through hole 31 of the base 3 by hammering, as shown in Figure 14 (fastener press-fitting process S6). In this embodiment, the bolt fastener 5 is pressed into place by hammering the bolt assembly 9. The lower end of the main body 51 of the bolt fastener 5 is a small-diameter portion 55 with a smaller outer diameter than the general portion 54, so that the main body 51 can be smoothly inserted into the through hole 31. Also, when the bolt fastener 5 is pressed in, the protruding portion 52 formed on the lower side of the main body 51 bites into the inner circumferential surface of the through hole 31, while the upper part of the main body 51 where the protruding portion 52 and flange portion 53 are not formed is tightened against the base 3 due to the shrinkage of the wood. In this embodiment, since the protruding portion 52 is inclined with respect to the axial direction, the main body 51 is pressed into the through hole 31 while rotating in a predetermined rotational direction around its central axis. In this embodiment, the bolt fastener 5 is fixed to the base 3 with the flange portion 53 of the main body 51 in contact with the upper surface of the base 3 and the protrusion 56 embedded in the upper surface of the base 3.

[0031] After fixing the bolt fastener 5, the tightness of the nut 6 is adjusted to lock it in place (locking process S7). Through the above process, as shown in Figure 1, additional bolts 4 for shear reinforcement are installed on the existing foundation building 1.

[0032] According to the installation method for the shear reinforcement bolts 4 of this embodiment, by using the bolt fastener 5, the shear reinforcement bolts 4 can be installed with simpler work compared to using two hexagonal bolts as described in Patent Document 1. Therefore, a structure that can bear the horizontal shear force during an earthquake can be easily added to the wooden building 1. The shear reinforcement bolts 4 of this embodiment do not require firm fixing in the insertion hole 21 of the foundation 2, as is the case with the post-installed anchor bolts described in Patent Document 1, but they may be filled with a fixing chemical solution and solidified as needed. In this case, for example, resin can be used as the fixing chemical solution, and the amount of resin should be adjusted so that the fixing chemical solution does not overflow onto the base 3.

[0033] Furthermore, since a protruding portion 52 is formed on the lower side of the main body 51 of the bolt fastener 5, when it is pressed into the through hole 31, the upper side of the main body 51 is tightened against the base 3 due to the contraction of the wood, and the bolt fastener 5 can be firmly fixed to the base 3. As a result, the bolt fastener 5 can be made less likely to loosen relative to the bolt 4 used for shear reinforcement. In addition, in this embodiment, a nut 6 for preventing loosening is provided in a double nut configuration, so the nut 6 also prevents the bolt fastener 5 from loosening.

[0034] Furthermore, in this embodiment, the protruding portion 52 is formed at an angle to the axial direction of the main body 51, and the main body 51 is screwed into the shear reinforcement bolt 4 in the same rotational direction as the direction in which the main body 51 loosens. Therefore, in order to loosen the main body 51 from the bolt 4, it is necessary to rotate the main body 51 further in the direction of screwing it into the base 3, and this also makes it difficult for the bolt fastener 5 to loosen.

[0035] Furthermore, in this embodiment, a flange portion 53 is formed on the bolt fastener 5, so the bolt fastener 5 is positioned so that the lower surface of the flange portion 53 contacts the upper surface of the base 3. In addition, the convex portion 56 on the lower surface of the flange portion 53 bites into the upper surface of the base 3, which suppresses the rotation of the bolt fastener 5, thereby preventing the bolt fastener 5 from loosening.

[0036] Furthermore, in this embodiment, the bolt fastener 5 is made of engineering plastic, and because engineering plastic has a lower hardness than metal, the male thread portion and the female thread portion have a high degree of contact, which also makes the bolt fastener 5 less likely to loosen.

[0037] Furthermore, in this embodiment, the lower end of the main body 51 of the bolt fastener 5 is a small-diameter portion 54 with a smaller diameter than the general portion 55, so that the bolt fastener 5 can be smoothly pressed into the insertion hole 31.

[0038] In the above embodiment, a washer 7 is shown interposed between the bolt fastener 5 and the nut 6, but a configuration without the washer 7 is also possible.

[0039] Furthermore, although the above embodiment shows that each protruding portion 52 is formed at an inclination with respect to the axial direction of the main body 51, each protruding portion 52 may also be formed parallel to the axial direction of the main body 51. In this case as well, the portion of the main body 51 on the upper side where the protruding portions 52 etc. are not formed can be tightened against the base 3 due to the shrinkage of the wood. In other words, the protruding portions 52 only need to be formed on the lower side of the outer circumferential surface of the main body 51, extending at least in the vertical direction.

[0040] Furthermore, although the above embodiment shows a configuration in which a protrusion 56 is formed on the lower surface of the flange portion 53, the protrusion 56 may be omitted if necessary, and it is even possible to omit the flange portion 53 altogether.

[0041] Furthermore, although the above embodiment shows an example using a bolt 4 without a head, a bolt 104 having a head 141 can also be used, for example, as shown in Figures 15 and 16. This shear reinforcement bolt 104 is made of metal and has a head 141 at its upper end that has a regular hexagonal shape when viewed in the axial direction, and male threads 142 are formed along its entire length. The material of the bolt 104 is arbitrary and may be engineering plastic, for example. Also, the male threads 142 of the bolt 104 do not have to be formed along its entire length, and it is sufficient if they are formed at least in the portion necessary for screwing it into the bolt fastener 5. In addition, the shape of the head 141 of the bolt 104 can be arbitrarily changed as long as it is a shape that can be fastened.

[0042] When using a bolt 104 having a head 141, as shown in Figure 17, the bolt assembly 109 is assembled in assembly step S4 by screwing the bolt 104 and the bolt fastener 5 together. Then, as shown in Figure 18, the bolt assembly 109 is set on the base 3 so that the bolt 104 is inserted into the through hole 31 and the insertion hole 21 (bolt positioning step S5). After this, as shown in Figure 19, the bolt fastener 5 of the bolt assembly 109 is pressed into the through hole 31 of the base 3 by impact (fastener press-fitting step S6). Then, the tightness of the bolt 104 is adjusted and locked (locking step S7).

[0043] Furthermore, as shown in Figure 20, the shear reinforcement bolts 4,104 can also be installed in the base building 1 without assembling the bolt assemblies 9,109. The installation method for the shear reinforcement bolts 4,104 shown in Figure 20 includes a base drilling step S11 to form through holes 31 for the bolts 4,104 in the base 3, a foundation drilling step S12 to form insertion holes 21 for the bolts 4,104 in the foundation 2, an insertion hole cleaning step S13 to clean the inside of the insertion holes 21, a fastener press-fitting step S14 to press-fit the bolt fasteners 5 into the through holes 31 in the base 3, and a bolt fixing step S15 to fix the bolts 4,104 in the state where they are inserted into the bolt insertion holes 31 and insertion holes 21 by screwing them together with the bolt fasteners 5. The base drilling step S11, the foundation drilling step S12, and the insertion hole cleaning step S13 are the same as in the above embodiment. The installation method for bolts 4 and 104 shown in Figure 20 is applicable whether the bolt 4, which does not have a head as shown in Figure 3, or the bolt 104, which has a head 104 as shown in Figure 15, is used.

[0044] In this method of installing the shear reinforcement bolts 4,104, unlike the embodiment described above, after cleaning the insertion hole 21, the bolt fastener 5 is pressed into the through hole 31 of the base 3 by striking, as shown in Figure 21 (fastener press-fitting step S14). The bolt fastener 5 can be pressed in, for example, by hammering. From this state, the shear reinforcement bolts 4,104 are screwed onto the bolt fastener 5 and inserted into the through hole 31 and insertion hole 21 (bolt screwing step S15). After this, in the case of bolts 4 without a head, a nut 6 that provides a loosening prevention function for the bolt fastener 5 is screwed onto the upper end of the bolt 4, and the tightness of the nut 6 is adjusted to lock it (locking step S16). At this time, it is optional whether or not a washer 7 is interposed between the bolt fastener 5 and the nut 6. In the case of bolts 104 with a head, the tightness of the bolt 104 is adjusted to lock it (locking step S16). Through the above process, additional shear reinforcement bolts 4,104 can be installed on the existing foundation structure 1.

[0045] Although embodiments of the present invention have been described above, the embodiments described above do not limit the invention as defined in the claims. Furthermore, it should be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. [Explanation of Symbols]

[0046] 1 Wooden buildings 2 Basics 3. Base 4. Bolts for shear reinforcement 5 Bolt fasteners 6 nuts 7 Washers 8. Packing 9 Bolt Assembly 21 Insertion hole 31 Through hole 41 Male screw 51 Main unit 52 Projection part 53 Flange section 54 General section 55 Small diameter section 56 Convex part 104 Bolts for shear reinforcement 109 Bolt Assembly 141 Head 142 Male screw S1 Foundation hole drilling process S2 Foundation drilling process S3 Insertion hole cleaning process S4 Assembly Process S5 Bolt positioning process S6 Fixture press-fitting process S7 Locking process S11 Foundation hole drilling process S12 Foundation drilling process S13 Insertion hole cleaning process S14 Fixing device press-fitting process S15 Bolt threading process S16 Locking process

Claims

1. A cylindrical body is pressed into the upper end of the through-hole in the base through which the bolt is inserted, and has a female threaded portion formed on its inner circumference that can be screwed with the bolt, A bolt fastener having a projection formed on the lower side of the outer circumferential surface of the main body, extending at least in the vertical direction, which bites into the inner circumferential surface of the insertion hole when the main body is pressed into the base by impact.

2. The bolt fastener according to claim 1, having a flange portion that extends radially outward from the upper end of the main body and contacts the upper surface of the base when pressed into the through hole.

3. The bolt fastener according to claim 2, wherein the flange portion has a protrusion on its lower surface for preventing rotational loosening.

4. The bolt fastener according to claim 1, wherein the main body comprises a general portion having a substantially constant outer diameter and a small-diameter portion formed on the lower end side having a smaller outer diameter than the general portion.

5. The aforementioned protruding portion is formed at an inclination with respect to the axial direction of the main body, The main body is pressed into the insertion hole by impact while rotating in a predetermined rotational direction around its central axis. The bolt fastener according to claim 1, wherein the predetermined rotation direction is the same direction as the direction in which the main body loosens relative to the bolt.

6. A method for installing bolts for shear reinforcement using the bolt fastener described in claim 1, The process of drilling holes in the base to form through holes for bolts, The process of drilling holes in the foundation to form insertion holes for bolts, A method for installing bolts for shear reinforcement, comprising a fastener press-fitting step of press-fitting the bolt fastener into the through-hole of the base.

7. Prior to the press-fitting step of the fastener, there is an assembly step of assembling a bolt assembly in which the bolt fastener is screwed onto the upper end of the bolt, The process includes a bolt positioning step of setting the bolt assembly onto the base so that the bolt is inserted into the through hole and the insertion hole, The method for installing a bolt for shear reinforcement according to claim 6, wherein in the pressing-fitting step of the fixing device, the bolt fixing device is pressed into the through hole by striking the bolt assembly.

8. The aforementioned bolt is a fully threaded bolt without a head. The method for installing a bolt for shear reinforcement according to claim 7, wherein in the assembly process, the bolt fastener and nut are screwed onto the upper end of the bolt.

9. The method for installing a bolt for shear reinforcement according to claim 7, wherein the bolt has a head at its upper end.

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