WO2010001532A1

WO2010001532A1 - Fastening fitting

Info

Publication number: WO2010001532A1
Application number: PCT/JP2009/002622
Authority: WO
Inventors: 大倉義邦
Original assignee: Okura Yoshikuni
Priority date: 2008-06-30
Filing date: 2009-06-10
Publication date: 2010-01-07
Also published as: JP5188892B2; JP2010007428A

Abstract

A fastening fitting for a wooden building can construct a fastening section capable of relieving an impact load and allows a reduction in the cross-sectional area of members such as beams. A fastening fitting (10) provided with a helical ridge (11) formed on the side peripheral surface thereof, an axially extending introduction hole (14) formed at the center of an end surface thereof, and a female screw thread (13) formed on the inner end side of the introduction hole, the diameter of the introduction hole (14) being greater than the outer diameter of the female screw thread (13). When a bolt (21) is inserted into the introduction hole (14), the length of the intermediate section (24) of the bolt (21) inevitably increases. This causes the intermediate section (24) to be likely to elastically or plastically deform when a tensile load acts on the bolt (21), and this allows the intermediate section to absorb an impact load to prevent members from cracking. As a result, the fastening fitting does not come out of position unlike conventional products and the cross sectional areas of the members can be reduced.

Description

Fastening hardware

The present invention relates to a fastener for fastening members such as columns and beams in a wooden building.

The shaft construction method that builds the framework of a building by combining rod-shaped members such as columns and beams needs to increase the rigidity of the fastening part between members in order to ensure strength, and measures such as combining hozos and grooving grooves so far Has been taken. However, in recent years, instead of these, a hardware construction method in which various kinds of hardware are interposed between members and fastened has become widespread. Even if hardware is used, it is necessary to machine holes and grooves in the member, but these have fewer cross-sectional defects than conventional hozo grooves, etc., and do not cause a decrease in strength, and the hardware is deformed. There are many advantages, such as absorbing impact.

In addition, with the development of laminated timber technology, members with large cross-sections can be easily obtained, and wooden structures that were not feasible in the past, such as three-story buildings and buildings with a large space between pillars. Architecture is also beginning to spread. In such a building, it is necessary to sufficiently secure the strength of the fastening portion between the column and the beam, and a hardware such as Patent Document 1 below is often used. The hardware disclosed in this document is used in a fastening structure between a pillar and a beam in a portal skeleton structure, and the basic hardware and the accessory hardware are integrated with the member via a lag screw.

JP 2007-132168 A

In the structure disclosed in FIG. 1 of the above-mentioned patent document, a lag screw is embedded in both a vertical member and a cross member, a metal object is brought into contact with one end surface of the lag screw, and the lag screw and the metal object are integrated with a bolt. It has become. Accordingly, the load acting on the hardware is transmitted to the member via the lag screw, but none of the hardware, bolts, or lag screw has flexibility in order to ensure the rigidity of the fastening portion. Therefore, the initial rigidity is high, and the fastening part will not be deformed by daily external force, but when an earthquake is encountered, the impact load is transmitted to the member without relaxation. Cracks occur. In this case, the lag screw may fall out of the member without showing any stickiness, and the fastening portion may be destroyed.

The impact of such an impact load is naturally taken into consideration at the design stage, and the cross-sectional area of the member is increased to prevent the occurrence of cracks, so that the lag screw does not actually fall off. Therefore, it has strength more than necessary for daily external force other than impact load. Therefore, if the impact load can be absorbed by hardware or the like, the sectional area of the member can be reduced, the skeleton structure can be simplified and the weight can be reduced, and the construction cost can be reduced. Note that a general hardware that does not use a lag screw can absorb an impact load by deformation of the hardware itself, and can also absorb an impact load by bending pins that fix the hardware. However, since the initial rigidity of a general hardware is lower than that in the case of using a lag screw as in Patent Document 1, there is a problem that fine movement is generated by daily external force in a three-story building or the like.

The present invention has been developed on the basis of such a situation, and an object thereof is to provide a fastener for a wooden building capable of constructing a fastening portion capable of reducing an impact load and reducing a cross-sectional area of a member such as a beam.

According to the first aspect of the present invention for solving the above-mentioned problem, a spiral protrusion is formed on the side peripheral surface with a cylindrical outer shape, and an introduction hole extending in the axial direction is formed at the center of one end surface. The introduction hole is provided with a female screw extending in the axial direction and reaching the opposite surface at the back of the introduction hole, and the introduction hole has a diameter larger than the outer diameter of the female screw. The fastening hardware.

The fastening hardware according to the present invention is based on a metal rod having a circular cross section like a general lag screw, and on the side peripheral surface thereof, protruding ridges projecting in the radial direction are formed in a spiral shape. Is integrated into the member by biting into the member. The introduction hole is a circular cross-sectional hole extending in the axial direction from the center of one end face, and a female screw for screwing a bolt or the like is formed in the back thereof. This female screw naturally extends concentrically with the introduction hole and extends in the axial direction and reaches the opposite surface. Therefore, an introduction hole is formed on one end surface of the fastening hardware, and a female screw is formed on the other end surface. The extension of the female screw is preferably equal to or larger than the nominal diameter, and the extension of the introduction hole is preferably at least twice the extension of the female screw. Furthermore, the diameter of the introduction hole needs to be larger than the outer diameter of the female screw, and the screw portion of the bolt that is screwed into the female screw can pass through the introduction hole without difficulty. As described above, the present invention is characterized by having a female screw and an introduction hole, and other shapes can be freely determined each time without any restriction.

The invention according to claim 2 has a cylindrical outer shape with a spiral ridge formed on the side peripheral surface, and an introduction hole extending in the axial direction is formed at the center of one end surface or both end surfaces, A bottomed female screw extending in the axial direction is provided at the back of the introduction hole, and the introduction hole is a fastening hardware having a diameter larger than the outer diameter of the female screw.

The invention according to claim 2 is also related to the lag screw in which the introduction hole and the female screw are formed, as in the invention of claim 1, but in this invention, the female screw at the tip of the introduction hole has a bottom and is opposite. The surface has not been reached. Even in this case, the extension of the female screw is preferably equal to or larger than the nominal diameter, and the extension of the introduction hole is preferably at least twice the extension of the female screw. Further, the diameter of the introduction hole is equal to that of the female screw. It is necessary to make it larger than the outer diameter. The introduction hole and the female screw at the back of the introduction hole may be formed only on one end surface or on both end surfaces.

The invention according to claim 3 is a cylindrical outer shape, a spiral protrusion is formed on the side peripheral surface, and an introduction hole extending in the axial direction is formed at the center of both end faces. A fastening hardware is provided in the back of the housing having a female screw communicating with the introduction holes on both sides, and the introduction hole has a diameter larger than the outer diameter of the female screw.

The invention of claim 3 is also related to the lag screw in which the introduction hole and the female screw are formed, as in the inventions of claims 1 and 2, but in this invention, the introduction hole is formed at the center of the left and right end faces. A female screw is formed so as to connect the two introduction holes. Accordingly, bolts can be inserted from both the left and right sides, and only one female screw need be formed. Even in this case, the extension of the female screw is preferably equal to or greater than the nominal diameter, and the extension of each introduction hole is preferably at least twice the extension of the female screw. It must be larger than the outer diameter of the screw.

An introduction hole is formed in one end face or both end faces of the lag screw thus formed with a spiral ridge, a female screw is formed in the back, and the diameter of the introduction hole is further screwed into the female screw. By making the diameter larger than the diameter of the tip of the bolt, the bolt passes through the introduction hole and is then screwed into the female screw. Therefore, the distance of the intermediate part from the bolt head to the tip part screwed with the female screw is increased, and the bolt is easily elastically or plastically deformed therebetween. Therefore, even when an impact load is applied in the axial direction of the bolt, the impact is mitigated by deforming the intermediate portion of the bolt, and the maximum load acting on the member can be suppressed. In addition, the form of Claim 1 is applied to a comparatively short thing, and the form of Claims 2 and 3 is applied to a comparatively long thing.

As in the invention described in each claim, a fastening metal fitting in which a spiral protrusion is formed on the side peripheral surface, an introduction hole is further formed on one end surface or both end surfaces, and a female screw is formed on the inner side of the introduction hole. By using the bolt, when the bolt is inserted from the introduction hole toward the female screw, the distance from the bolt head to the tip portion screwed with the female screw increases. By securing such an intermediate portion, the bolt is easily elastically or plastically deformed, and even when an impact load is applied in the axial direction of the bolt, this is relaxed and transmitted to a member such as a beam. . Therefore, even when a sudden external force due to an earthquake or the like is applied, the bolt is deformed to prevent the member from cracking and the fastening hardware does not fall out. Therefore, when designing the fastening part, it is only necessary to ensure the strength against the quasi-static load, so that the cross-sectional area of the member can be reduced, the skeleton structure is simplified and the weight is reduced, and the construction cost is reduced. Reductions can also be expected. The present invention absorbs sudden impact load by deformation of the bolt, and there is no backlash at the fastening portion, sufficient initial rigidity is ensured, and the building is not shaken by daily external force.

The shape example of the fastening metal fitting by the invention of Claim 1 is shown, (A) is the perspective view seen from the internal thread side, (B) is the perspective view seen from the hexagon part side, (C) is the center It is a longitudinal cross-sectional view. Examples of shapes of fastening hardware according to the present invention are listed, and (A) and (B) are a perspective view and a cross-sectional view of the fastening hardware according to the invention of claim 2, and (A) shows only one end surface of the introduction hole. And (B) is formed on both end faces. Further, (C) is a cross-sectional view of the fastening hardware according to the third aspect of the present invention. It is a perspective view which shows the structural example which fastens a column and a beam using the fastening hardware shown in FIG. The state which integrated the pillar and beam shown in FIG. 3 is shown, (A) is the whole, (B) is a center longitudinal cross-section. The structural example which fastens a pillar and a beam like FIG. 3 is shown. The state which integrated the pillar and beam shown in FIG. 5 is shown, (A) is the whole, (B) is a center longitudinal cross-section. It is a longitudinal cross-sectional view of the state which the external force acted on the structure of FIG. 6 (B), and the fastening part of a pillar and a beam deform | transformed. It is a perspective view of the state which used the fastening hardware by this invention for installation of a pillar. It is a longitudinal cross-sectional view of the state which installed the pillar shown in FIG. 8 to foundation concrete.

FIG. 1 shows an example of the shape of a fastener 10a according to the first aspect of the invention. FIG. 1 (A) is viewed from the female screw 13 side, and FIG. 1 (B) is viewed from the hexagonal part 12 side. FIG. 1C is a central longitudinal section. This fastening hardware 10a has an appearance similar to that of a general lag screw, a spiral ridge 11 is formed on the side peripheral surface of a cylindrical metal rod, and one end surface is cut off to a simple perfect circular section, A female screw 13 extending in the axial direction is formed at the center, and the bolt 21 can be screwed together. Further, as shown in FIG. 1B, a hexagonal portion 12 for hanging tools such as a wrench is formed on the opposite end surface, and an introduction hole 14 extending in the axial direction is formed at the center thereof. The introduction hole 14 and the female screw 13 communicate with each other, and the diameter of the introduction hole 14 is larger than the outer diameter of the female screw 13. Accordingly, as shown in FIG. 1C, when the bolt 21 is inserted from the hexagonal portion 12, the intermediate portion 24 in addition to the male screw-like tip portion 23 passes through the introduction hole 14 without any trouble, and the female screw 13 and the screw 21 are screwed. Can be combined.

As shown in FIG. 1C, when a bolt 21 is inserted from the hexagonal portion 12 and its tip portion 23 is screwed into the female screw 13, and a tensile load is applied to the bolt 21, the head 22 The intermediate portion 24 of the tip portion 23 can be freely deformed according to its physical property value, and if an impact load is applied to the head portion 22, the intermediate portion 24 is elastically or plastically deformed, and the fastening hardware The load acting on 10a is relaxed. Therefore, the longer the intermediate portion 24, the easier it is to absorb the impact. The fastening hardware 10a according to the present invention can also be used in a normal method in which the bolt 21 is inserted from the end face on which the female screw 13 is formed.

FIG. 2 lists examples of the shapes of the fastening hardware according to the present invention, and FIGS. 2A and 2B are a perspective view and a sectional view of the

fastening hardware

10b, 10c according to the invention of claim 2. FIG. is there. The fastening hardware 10b is formed with a hexagonal portion 12 only at one end surface, an introduction hole 14 is formed at the center thereof, and a female screw 13 is formed at the back of the fastening hardware 10b. Not done. Therefore, when the fastening hardware 10b is embedded in the member, the end face on the left side of the drawing is set at the top. On the other hand, the fastening hardware 10c is formed with a hexagonal portion 12 and an introduction hole 14 on both end faces, and a bottomed female screw 13 is formed at the back of each introduction hole 14. FIG. 2C is a cross-sectional view of the fastening hardware 10d according to the third aspect of the present invention. The appearance of the fastening hardware 10d is exactly the same as the perspective view of FIG. In this embodiment, the introduction holes 14 are formed on the left and right end faces, and the female screw 13 is formed in the back so as to communicate both the introduction holes 14.

FIG. 3 shows a structural example in which the column 41 and the beam 42 are fastened using the fastening hardware 10a shown in FIG. In this figure, the end surface of the beam 42 is brought into contact with the side surface of the column 41 to form an L-shaped fastening portion. Two side holes 43 are provided on the side surface of the column 41 and the end surface of the beam 42, respectively. It is processed side by side in the vertical direction, and fasteners 10a having the same shape are embedded in these four locations. Since the diameter of the pilot hole 43 is equal to the diameter of the fastening hardware 10a (excluding the ridges 11), only the ridge 11 bites into the columns 41 and the beams 42, and the fastening hardware 10a is caused by the friction. Is fixed. In addition, the receiving bracket 31 and the hanging bracket 32 have a function of integrating the column 41 and the beam 42, and each has a rectangular bar shape extending vertically, and a tapered wedge portion 34 is formed at one end thereof. An annular strip 33 is joined to the end. Therefore, by combining the wedge portion 34 and the band plate 33, the receiving metal 31 and the hanging metal 32 are integrated.

The receiving metal 31 and the hanging metal 32 are both integrated with the fastening hardware 10 a via the bolt 21. Further, in the fastening hardware 10a, the female screw 13 is located on the opposite side of the bolt 21 insertion direction on both the column 41 and the beam 42 side. Therefore, the hexagonal portion 12 of the fastening hardware 10a is in contact with the receiving metal 31 and the hanging metal 32, and the female screw 13 is located on the opposite side. Therefore, the bolt 21 is required to have a length that can be screwed with the female screw 13 and is easily deformed in the axial direction. In addition, a longitudinal groove 44 is formed at the end of the beam 42 to accommodate the receiving metal 31 and the hanging metal 32.

FIG. 4 shows a state in which the column 41 and the beam 42 shown in FIG. 3 are integrated, FIG. 4 (A) is the whole, and FIG. 4 (B) is a central longitudinal section. When the column 41 and the beam 42 are integrated as described above, the fastening hardware 10a is not exposed to the outside, but the upper and lower surfaces of the receiving metal 31 and the hanging metal 32 are exposed to the outside. Further, as shown in the sectional view, the female screw 13 of the fastening hardware 10a is located on the opposite side to the head 22 of the bolt 21, and the total length of the bolt 21 is inevitably increased to easily reduce the impact. Become.

Next, FIG. 5 shows a structural example for fastening the column 41 and the beam 42 as in FIG. This figure has a simpler structure than that of FIG. 3, and the fastening hardware 10 b is embedded in the beam 42, and the embedded shaft 35 is embedded in the column 41. As shown in FIG. 2 (A), the fastening hardware 10b is formed with an introduction hole 14 only at one end face, and has a bottomed female screw 13 at the back, and a prepared hole 43 machined in the end face of the beam 42. Embedded in. On the other hand, the buried shaft 35 is a general lag screw, and the ridge 11 is formed on the side peripheral surface, the hexagonal portion 12 is provided on one end surface, and the round hole 36 penetrating both end surfaces is formed in the center. The bolt 21 can be inserted. In order to embed the burying shaft 35, a pilot hole 43 penetrating the side surface is processed in the column 41.

FIG. 6 shows a state in which the column 41 and the beam 42 shown in FIG. 5 are integrated, FIG. 6 (A) is a whole, and FIG. 6 (B) is a central longitudinal section. Even when the column 41 and the beam 42 are fastened using the fastening hardware 10b, the external appearance is not different from the conventional one as shown in FIG. However, as shown in FIG. 6B, the internal structure of the internal thread 13 of the fastening hardware 10b is farthest from the head 22 of the bolt 21, and the impact is caused by the deformation of the bolt 21 in the axial direction. It has a structure that can be relaxed.

FIG. 7 shows a state in which the fastening portion between the column 41 and the beam 42 is deformed due to an external force acting on the structure of FIG. 6 (B). Thus, when an external force due to an earthquake or the like is applied, the bolt 21 is plastically deformed to absorb energy and relieve the load acting on the beam 42 and the like, and the fastening hardware 10b and the embedded shaft 35 fall off. And avoid breaking the fastening part. Although the bolt 21 is plastically deformed as shown in the figure, it is possible to repair the fastening portion by exchanging it.

FIG. 8 shows a state in which the fastening hardware 10b according to the present invention is used for installation of the pillar 41. As shown in this figure, when the column 41 is erected on the foundation concrete 45, a column base metal member 37 may be interposed in order to firmly integrate the both. The column base metal 37 has an H-shaped cross section. An anchor bolt 46 is inserted into the fixing hole 40, and a nut 38 is screwed and tightened to the tip to thereby fix the column base metal 37 to the basic concrete 45. Integrate. The column 41 placed on the top surface of the column base metal 37 has a bottom hole 43 formed in the bottom surface, and after the fastening metal 10b shown in FIG. When the bolt 21 is inserted into the hole 39 and screwed into the female screw 13 of the fastening hardware 10b, both are completely integrated.

FIG. 9 is a longitudinal section showing a state in which the foundation concrete 45 and the column 41 shown in FIG. 8 are integrated. The column base 37 is integrated with the foundation concrete 45 by an anchor bolt 46 and a nut 38. The column 41 is integrated with the column base metal 37 by the bolt 21. The fastening hardware 10b embedded in the column 41 has the female screw 13 positioned on the upper side, and the total length of the bolt 21 is inevitably long. Therefore, when an external force is applied to pull the column 41 from the foundation concrete 45, the bolt 21 is deformed and absorbs energy.

10a, 10b, 10c, 10d Fastening hardware 11 Convex ridge 12 Hexagonal portion 13 Female screw 14 Introduction hole 21 Bolt 22 Head portion 23 Front portion 24 Intermediate portion 31 Bracket 32 Hanging bracket 33 Band plate 34 Wedge portion 35 Buried shaft 36 Round hole 37 Column base 38 Nut 39 Vertical hole 40 Fixing hole 41 Column 42 Beam 43 Pilot hole 44 Vertical groove 45 Foundation concrete 46 Anchor bolt

Claims

A spiral ridge (11) is formed on the side peripheral surface with a cylindrical outer shape, and an introduction hole (14) extending in the axial direction is formed at the center of one end surface. The introduction hole (14) A female screw (13) extending in the axial direction and reaching the opposite surface is provided at the back of the inner surface, and the introduction hole (14) has a diameter larger than the outer diameter of the female screw (13). Fastening hardware characterized by
A spiral ridge (11) is formed on the side peripheral surface with a cylindrical outer shape, and an introduction hole (14) extending in the axial direction is formed at the center of one end face or both end faces. A bottomed female screw (13) extending in the axial direction is provided at the back of the hole (14), and the introduction hole (14) has a diameter larger than the outer diameter of the female screw (13). Fastening hardware characterized by that.
A spiral protrusion (11) is formed on the side peripheral surface with a cylindrical outer shape, and an introduction hole (14) extending in the axial direction is formed at the center of both end faces. The introduction hole (14 ) Is provided with female screws (13) communicating with the introduction holes (14) on both sides, and the introduction hole (14) has a diameter larger than the outer diameter of the female screw (13). Fastening hardware characterized by