【０００１】
【発明の属する技術分野】
本発明は、木造建築物の骨組みを構成する構造部材同士の接合部に設置される耐震補強金具に関し、特に、既設建築物での骨組みを構成する構造部材同士の接合部に設置される耐震補強金具に関する。
【０００２】
【従来の技術】
木造建築物では、土台と柱、土台と根太、柱と桁などの構造材をほぞとほぞ穴との組み合わせや軸接続構造等で接合して骨組みとしているが、その接合部に補強金具を配置して、耐震補強するようにしている。
【０００３】
【発明が解決しようとする課題】
このような補強金具として、従来から種々の形状・構造のものが提供されている。従来の補強金具は釘やネジで骨組構造材に止め付けていたことから、地震時に接合コーナー部を支点とする揺れによって、補強金具と骨組構造材とを引き離す方向の力が作用して補強金具と骨組構造材とを結合している釘やネジが脱落し、補強金具での補強が十分発揮できないことがあった。そこで釘やネジを太くして骨組構造材との接触面積を広くして、脱落を抑制するようにすることも考えられるが、その場合には、木口部分からボルトや釘の装着部分に向けて割れが生じるという問題があった。
【０００４】
本発明はこのような点に着目してなされたもので、簡単な構成でありながら、地震時での縦揺れや横揺れに十分対応することのできる耐震補強金具を提供することを目的とする。
【０００５】
【課題を解決するための手段】
上述の目的を達成するために請求項１に記載の発明は、略Ｌ字型に形成した金属製金具本体の二つの取付片に大径ネジ挿通孔と複数の小径ネジ挿通孔とをそれぞれ形成し、一方の取付片では折れ曲がり部分から離れた位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折曲がり部分寄りに複数の小径ネジ挿通孔を形成し、他方の取付片では折れ曲がり部分に近い位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折れ曲がり部分から離れる側に複数の小径ネジ挿通孔を形成してあることを特徴としている。
【０００６】
また、請求項２に記載の発明は、金属製金具で接合される骨組構造部材が土台と、それに接合される柱材あるいは根太材であることを特徴とするものである。
【０００７】
【発明の作用】
本発明では、略Ｌ字型に形成した金属製補強材の二つの取付片に大径ネジ挿通孔と複数の小径ネジ挿通孔とをそれぞれ形成し、一方の取付片では折れ曲がり部分から離れた位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折曲がり部分寄りに複数の小径ネジ挿通孔を形成していることから、地震等に伴なう骨組構造材の振動で木口からの割れを抑制するとともに、振動に伴なう振幅が大きくなるコーナー部から離れた個所でのネジ固定力が大きくなり、さらに、複数の小径ネジによる接触面積の増大で補強金具の骨組構造材からの脱離を抑制することができることになる。また、他方の取付片では折れ曲がり部分に近い位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折れ曲がり部分から離れる側に複数の小径ネジ挿通孔を形成して、略Ｌ字型金具での一方の取付片と他方の取付片とでその拘束力に差を持たせることにより、骨組構造材の破壊を可及的に防止できることになる。
【０００８】
【発明の実施の形態】
図は本発明の実施形態の一例を示し、図１は耐震補強金具の斜視図、図２はその使用状態の一例を示す斜視図である。
この耐震補強金具は、帯鋼板の中間部を折曲げることにより、２つの取付片（１）（２）が直角方向に連出する略Ｌ字形に形成した金具本体（３）と、この金具本体（３）の各取付片（１）（２）に套嵌するゴム製の鞘管（４）とで構成してある。
【０００９】
金具本体（３）は、各取付片（１）（２）に各々一つの大径ネジ挿通孔（５）と複数（図では三つ）の小径ネジ挿通孔（６）が透設してある。そして、この大径ネジ挿通孔（５）は、一方の取付片（１）では、折れ曲がり部（コーナー部）から離れる連出先端寄り部分に形成してあり、他方の取付片（２）では折れ曲がり部（コーナー部）に近い基端寄り部分に形成してある。
【００１０】
小径ネジ挿通孔（６）は取付片（１）（２）にその幅方向中央線を挟む状態で各々千鳥状に形成してある。そして、大径ネジ挿通孔（５）を連出先端寄り部分に形成している取付片（１）では、小径ネジ挿通孔（６）を大径ネジ挿通孔形成領域よりも基端寄り部分に、また大径ネジ挿通孔（５）を基端寄り部分に形成している取付片（２）では、小径ネジ挿通孔（６）を大径ネジ挿通孔形成領域よりも連出先端寄り部分に、夫々形成している。
【００１１】
鞘管（４）は金具本体（３）の各取付片（１）（２）の大径ネジ挿通孔形成領域及び小径ネジ挿通孔形成領域を覆う状態に挿嵌してあり、取付片（１）（２）に形成した大径ネジ挿通孔（５）及び小径ネジ挿通孔（６）と対応する個所にそれぞれ大径ネジ貫通孔（７）及び小径ネジ貫通孔（８）が透設してある。なお、この大径ネジ貫通孔（７）の大径ネジ挿入側の端縁部分には座ぐりが施してあり、小径ネジ貫通孔（８）の小径ネジ挿入側の端縁部分の周面は円錐状に形成してある。
【００１２】
この耐震補強金具を木造建築物の骨組構造材（９）である土台材（１０）と柱材（１１）との接合部分に使用する場合、土台材（１０）の中間部に形成されたほぞ穴に柱材（１１）の木口に形成したほぞを嵌め合わせて土台材（１０）上に柱材（１１）が立設されることになるから、接続部に木口を有する柱材（１１）に大径ネジ挿通孔（５）が連出先端寄りに形成されている取付片（１）が、土台材（１０）に小径ネジ挿通孔（６）が連出先端寄りに形成されている取付片（２）がそれぞれ位置する状態に取り付ける。
【００１３】
そして図３に示すように、各取付片（１）（２）の大径ネジ挿通孔（５）に例えば六角コーチネジのような大径ネジ（１２）を、また図４に示すように小径ネジ挿通孔（６）に例えばサラ頭ネジのような小径ネジ（１３）を装着して各取付片（１）（２）を骨組構造材（９）に確りと止め付ける。この時、各取付片（１）（２）にはゴム製の鞘管（４）が套嵌してあることから、各取付片（１）（２）と骨組構造材（９）の表面との間に位置する鞘管（４）が緩衝材として作用するうえ、大径ネジ（１２）や小径ネジ（１３）の頭部分が鞘管（４）に当接することから、各ネジ頭と取付片（１）（２）との間の緩衝作用と水仕舞の作用とを果たすことになる。
【００１４】
なお、大径ネジ（１２）や小径ネジ（１３）はその螺条部分（１４）を図５に示すように、上面が脚部中心軸に対して直交し、下面が軸周面（１５）と鈍角をなす形状に形成してある。螺条部分（１４）をこのように構成しておくことで、骨組構造材（９）に対する大径ネジ（１２）や小径ネジ（１３）の喰い込みが確りし、固定力が強くなるうえ、振動時に抜け出し難くなる。
【００１５】
図６は上述の耐震補強金具を土台材（１０）と根太材（１５）の連結あるいは土台材（１０）（１０）同士の連結のように水平面内で軸接合されるような骨組構造材（９）に適用した場合を示す。この場合には、根太材や連結される土台材のように接続部に木口を有する部材（１４）に大径ネジ挿通孔（４）が連出先端寄りに形成されている取付片（１）が、土台材（１０）に小径ネジ挿通孔（６）が連出先端寄りに形成されている取付片（２）がそれぞれ位置する状態に取り付けることになる。
【００１６】
図７は異なる実施形態の耐震補強金具の斜視図、図８はその使用例を示す斜視図である。
この補強金具は、前述の実施形態から、鞘管を除いたものであり、金具本体（３）の構成は、戦術の実施形態と同様に構成してある。そして、この補強金具を使用する場合には、図８に示すように、金具本体（３）の取付片（１）（２）と骨組構造材（９）との間に緩衝材シート（１７）を配置して、大径ネジ（１２）及び小径ネジ（１３）を使用して、柱材（１１）等の接続部に木口を有する部材に大径ネジ挿通孔（４）が連出先端寄りに形成されている取付片（１）が位置する状態で止め付けることになる。
【００１７】
上述の各実施態様では、土台材と柱材、土台材同士、あるいは土台材と根太材との接合部に使用する例について説明したが、これを柱材と桁材やつか材との接合部に使用するようにしても良い。さらに、この耐震補強金具は、新築時だけでなく、既設の木造建築物の耐震補強に使用することができる。
【００１８】
【発明の効果】
本発明では、略Ｌ字型に形成した金属製補強材の二つの取付片に大径ネジ挿通孔と複数の小径ネジ挿通孔とをそれぞれ形成し、一方の取付片では折れ曲がり部分から離れた位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折曲がり部分寄りに複数の小径ネジ挿通孔を形成していることから、地震等に伴なう骨組構造材の振動で木口からの割れを抑制するとともに、振動に伴なう振幅が大きくなるコーナー部から離れた個所でのネジ固定力が大きくなり、さらに、複数の小径ネジによる接触面積の増大で補強金具の骨組構造材からの脱離を抑制することができる。また、他方の取付片では折れ曲がり部分に近い位置に大径ネジ挿通孔を、その大径ネジ挿通孔の形成位置よりも折れ曲がり部分から離れる側に複数の小径ネジ挿通孔を形成して、略Ｌ字型金具での一方の取付片と他方の取付片とでその拘束力に差を持たせることにより、骨組構造材の破壊を可及的に防止できる。
【図面の簡単な説明】
【図１】耐震補強金具の斜視図である。
【図２】その使用状態の一例を示す斜視図である。
【図３】大径ネジでの取り付け部を示す取り出し断面図である。
【図４】小径ネジでの取り付け部を示す取り出し断面図である。
【図５】ネジの螺条を示す要部破断一部取り出し図である。
【図６】別の使用例を示す斜視図である。
【図７】異なる実施形態の耐震補強金具の斜視図である。
【図８】異なる実施形態での耐震補強金具の一使用例を示す斜視図である。
【符号の説明】
１・２…取付片、３…金属製金具本体、５…大径ネジ挿通孔、６…小径ネジ挿通孔、９…木造建築物の骨組構造部材、１０…土台材、１１…柱材。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seismic retrofitting metal fitting installed at a joint between structural members constituting a framework of a wooden building, and more particularly to a seismic retrofitting installed at a joint between structural members constituting a framework of an existing building. About metal fittings.
[0002]
[Prior art]
In wooden buildings, structural members such as bases and columns, bases and joists, columns and girders are joined by a combination of tenon and tenon, and shaft connection structures, etc. Then, they are trying to reinforce earthquake resistance.
[0003]
[Problems to be solved by the invention]
Conventionally, as such reinforcing metal fittings, those having various shapes and structures have been provided. Conventional reinforcing brackets are fixed to the frame structure with nails or screws, so the shaking around the joint corner during an earthquake causes a force in the direction that separates the reinforcing bracket and the frame structure from acting. In some cases, the nails and screws connecting the steel and the frame structural member fell off, and the reinforcing metal could not be sufficiently used. Therefore, it is conceivable to use thicker nails and screws to increase the contact area with the frame structural material to suppress the falling off, but in this case, from the kiguchi to the bolt or nail mounting part There was a problem that cracks occurred.
[0004]
The present invention has been made in view of such a point, and it is an object of the present invention to provide a seismic retrofitting metal fitting which has a simple structure and can sufficiently cope with a pitching or a rolling in an earthquake. .
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a large-diameter screw insertion hole and a plurality of small-diameter screw insertion holes are respectively formed in two mounting pieces of a metal fitting main body formed in a substantially L-shape. On one of the mounting pieces, a large-diameter screw insertion hole is formed at a position away from the bent portion, and a plurality of small-diameter screw insertion holes are formed closer to the bent portion than the formation position of the large-diameter screw insertion hole. One piece is characterized in that a large-diameter screw insertion hole is formed at a position close to the bent portion, and a plurality of small-diameter screw insertion holes are formed on the side farther from the bent portion than the formation position of the large-diameter screw insertion hole.
[0006]
The invention according to claim 2 is characterized in that the frame structural member joined by the metal fitting is a base and a pillar or joist joined to the base.
[0007]
Effect of the Invention
In the present invention, a large-diameter screw insertion hole and a plurality of small-diameter screw insertion holes are respectively formed in two attachment pieces of a metal reinforcing material formed in a substantially L-shape, and one attachment piece is located away from a bent portion. The large-diameter screw insertion hole has a plurality of small-diameter screw insertion holes closer to the bent part than the position where the large-diameter screw insertion hole is formed. In addition to suppressing cracks from the tip, the screw fixing force at points away from the corner where the amplitude associated with vibration increases increases, and the contact area increases with multiple small-diameter screws. Desorption from the material can be suppressed. In the other mounting piece, a large-diameter screw insertion hole is formed at a position close to the bent portion, and a plurality of small-diameter screw insertion holes are formed on the side farther from the bent portion than the position where the large-diameter screw insertion hole is formed. By providing a difference in the restraining force between the one mounting piece and the other mounting piece in the V-shaped metal fitting, it is possible to prevent the frame structural material from being broken as much as possible.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an example of the embodiment of the present invention. FIG. 1 is a perspective view of an earthquake-resistant reinforcing bracket, and FIG. 2 is a perspective view showing an example of a use state thereof.
This seismic retrofitting metal fitting has a metal fitting body (3) formed by bending an intermediate portion of a strip steel plate into a substantially L-shape in which two mounting pieces (1) and (2) are extended in a right angle direction. It consists of a rubber sheath tube (4) fitted over each of the mounting pieces (1) and (2) of (3).
[0009]
In the metal fitting body (3), one large-diameter screw insertion hole (5) and a plurality (three in the figure) of small-diameter screw insertion holes (6) are provided through each of the mounting pieces (1) and (2). . The large-diameter screw insertion hole (5) is formed in one of the attachment pieces (1) at a portion closer to the leading end remote from the bent portion (corner portion), and is bent in the other attachment piece (2). It is formed in the part near the base end near the part (corner part).
[0010]
The small-diameter screw insertion holes (6) are formed in a staggered manner with the mounting pieces (1) and (2) sandwiching the center line in the width direction. In the mounting piece (1) having the large-diameter screw insertion hole (5) formed near the leading end of the continuous screw, the small-diameter screw insertion hole (6) is formed closer to the base end than the large-diameter screw insertion hole formation region. In the mounting piece (2) having the large-diameter screw insertion hole (5) formed near the base end, the small-diameter screw insertion hole (6) is formed closer to the leading end than the large-diameter screw insertion hole formation region. , Respectively.
[0011]
The sheath tube (4) is fitted so as to cover the large-diameter screw insertion hole forming area and the small-diameter screw insertion hole forming area of each of the mounting pieces (1) and (2) of the fitting body (3). (2) A large-diameter screw through-hole (7) and a small-diameter screw through-hole (8) are respectively provided at positions corresponding to the large-diameter screw insertion hole (5) and the small-diameter screw insertion hole (6) formed in (2). is there. The large-diameter screw through-hole (7) has a counterbore at the edge portion on the large-diameter screw insertion side, and the peripheral surface of the small-diameter screw through-hole (8) on the small-diameter screw insertion side has a peripheral surface. It is formed in a conical shape.
[0012]
When this seismic retrofitting is used for a joint between a base material (10) and a column material (11), which are framed structural materials (9) of a wooden building, a tenon formed at an intermediate portion of the base material (10). Since the tenon formed at the opening of the pillar (11) is fitted into the hole, the pillar (11) is to be erected on the base material (10). A mounting piece (1) in which a large-diameter screw insertion hole (5) is formed near the leading end of the extension, and a mounting in which a small-diameter screw insertion hole (6) is formed near the leading end of the base material (10). Attach so that the pieces (2) are located respectively.
[0013]
Then, as shown in FIG. 3, a large-diameter screw (12) such as a hexagonal coach screw is inserted into the large-diameter screw insertion hole (5) of each of the mounting pieces (1) and (2), and as shown in FIG. A small-diameter screw (13) such as a flat head screw is attached to the insertion hole (6), and each of the mounting pieces (1) and (2) is securely fastened to the frame structural member (9). At this time, a rubber sheath tube (4) is fitted over each of the mounting pieces (1) and (2), so that each of the mounting pieces (1) and (2) and the surface of the frame structural material (9) are in contact with each other. Since the sheath tube (4) located between them acts as a cushioning material and the heads of the large-diameter screw (12) and the small-diameter screw (13) abut on the sheath tube (4), each screw head is attached. The function of buffering between the pieces (1) and (2) and the function of closing the water is performed.
[0014]
As shown in FIG. 5, the large-diameter screw (12) and the small-diameter screw (13) have a thread portion (14) whose upper surface is orthogonal to the center axis of the leg and whose lower surface is a shaft peripheral surface (15). And an obtuse angle. By configuring the thread portion (14) in this manner, the large-diameter screw (12) and the small-diameter screw (13) bite into the frame structural member (9), and the fixing force is increased. It becomes difficult to come out during vibration.
[0015]
FIG. 6 shows a skeleton structure material in which the above-mentioned seismic retrofitting metal fittings are axially joined in a horizontal plane like the connection between the base material (10) and the joist material (15) or the connection between the base materials (10) and (10). The case where it applied to 9) is shown. In this case, a mounting piece (1) in which a large-diameter screw insertion hole (4) is formed near a leading end of a member (14) having a mouth at a connection portion, such as a joist or a base material to be connected. However, the small-diameter screw insertion hole (6) is attached to the base member (10) in a state where the attachment pieces (2) formed near the leading end of the continuous member are located.
[0016]
FIG. 7 is a perspective view of a seismic retrofitting bracket of a different embodiment, and FIG. 8 is a perspective view showing an example of its use.
This reinforcing metal is obtained by removing the sheath tube from the above-described embodiment, and the configuration of the metal fitting body (3) is the same as that of the tactical embodiment. When this reinforcing metal is used, as shown in FIG. 8, a cushioning material sheet (17) is provided between the mounting pieces (1) and (2) of the metal fitting main body (3) and the frame structural material (9). The large-diameter screw insertion hole (4) is located near the leading end of the member having the opening at the connection part such as the pillar (11) using the large-diameter screw (12) and the small-diameter screw (13). In the state where the attachment piece (1) formed in the position is located.
[0017]
In each of the above-described embodiments, the example in which the base material and the column material, the base material are used for the joint portion between the base material and the base material and the joist material has been described. May be used. Furthermore, this seismic retrofitting metal fitting can be used not only for new construction, but also for seismic retrofitting of existing wooden buildings.
[0018]
【The invention's effect】
In the present invention, a large-diameter screw insertion hole and a plurality of small-diameter screw insertion holes are respectively formed in two attachment pieces of a metal reinforcing material formed in a substantially L-shape, and one attachment piece is positioned away from a bent portion. The large-diameter screw insertion hole is formed with a plurality of small-diameter screw insertion holes closer to the bent part than the position where the large-diameter screw insertion hole is formed. In addition to suppressing cracks from the tip, the screw fixing force at points away from the corner where the amplitude accompanying vibration increases increases, and the contact area increases with multiple small-diameter screws. Desorption from the material can be suppressed. In the other mounting piece, a large-diameter screw insertion hole is formed at a position close to the bent portion, and a plurality of small-diameter screw insertion holes are formed on the side farther from the bent portion than the position where the large-diameter screw insertion hole is formed. By providing a difference in the restraining force between the one mounting piece and the other mounting piece in the character-shaped metal fitting, it is possible to prevent the frame structural material from being broken as much as possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a seismic reinforcement bracket.
FIG. 2 is a perspective view showing an example of the state of use.
FIG. 3 is a sectional view showing a mounting portion using a large-diameter screw.
FIG. 4 is a sectional view showing a mounting portion with a small-diameter screw.
FIG. 5 is a partial cutaway view of a main part showing a thread of a screw.
FIG. 6 is a perspective view showing another example of use.
FIG. 7 is a perspective view of a seismic retrofitting bracket of another embodiment.
FIG. 8 is a perspective view showing an example of use of a seismic retrofitting bracket in different embodiments.
[Explanation of symbols]
Reference numerals 1 and 2: mounting piece, 3: metal fitting main body, 5: large-diameter screw insertion hole, 6: small-diameter screw insertion hole, 9: frame structural member of wooden building, 10: base material, 11: pillar material.
