JP3959279B2

JP3959279B2 - Fastening device for rod-shaped member

Info

Publication number: JP3959279B2
Application number: JP2002021532A
Authority: JP
Inventors: 昭浩松永
Original assignee: Nisshoku Corp
Current assignee: Nisshoku Corp
Priority date: 2002-01-30
Filing date: 2002-01-30
Publication date: 2007-08-15
Anticipated expiration: 2022-01-30
Also published as: JP2003221831A

Description

【０００１】
【発明の属する技術分野】
本発明は、棒状部材の締結装置に関する。
【０００２】
【従来の技術】
道路や造成地などの法面を補強する工法の一つとして、法面に金網などの網状体を敷設した後に、この網状体上に鉄筋およびコイルを格子状に配置し、この後に格子状の鉄筋およびコイルを埋めるようにモルタルを吹き付けて、法面上に鉄筋入りの格子状法枠を施工する工法がある。
【０００３】
この工法によれば、法枠が格子状であって縦横に連続していることから、法面表層の剥落に対して強い抵抗力を発現させることができる。
【０００４】
ところが、上記の工法では、法面表層の剥落抑止の抵抗力を、モルタルによる格子状法枠の重量だけに頼ることから、急傾斜の法面では抵抗力が不足する場合があり、このことから本発明者は、格子状鉄筋の交差部にアンカーを設置することを思いついたのである。
【０００５】
即ち、格子状鉄筋の交差部に、硬い地盤にまで届かせるようにアンカー設置用の孔を穿って、このアンカー穴にアンカーを挿通させ、更に、アンカー穴にグラウトを充填してアンカーの定着を図る一方、アンカー固定用のスペーサ構造を設置して、モルタルの吹き付けによる格子状法枠の上部側に、アンカーの頭部を露出させるようにし、そして、アンカーにナットを螺合させて、このナットをスペーサ構造の支圧部材に当接させるように螺進させ、更に、ナットを螺進させてアンカーの締め固めを行い、もって、支圧部材を反力部材にしてアンカーに張力を付与させて、アンカーに与えた張力を地盤に伝えさせる。
【０００６】
このアンカー導入の工法によれば、アンカーが剥落抑止の大きな抵抗力を発現することから、急傾斜の法面であっても、これを格子状法枠の施工対象にすることが可能となる。
【０００７】
【発明が解決しようとする課題】
しかし、法面によっては、アンカーを深部の硬い地盤にまで届かせる上で、長大なアンカーの多数本を要することがあり、かつ、アンカーとして、一般にはナットの螺合が可能な例えばねじ節鉄筋が用いられるが、ねじ節鉄筋では、これが長大になるほどに重たくなることから、取り扱いの面ならびに施工性の面で改善の余地があった。
【０００８】
ここで本発明者は、更に鋭意研究・開発を重ねた結果、アンカーとして、繊維製等の非金属製の軽量な棒状部材を選択すれば、取り扱い面ならびに施工性の面での向上を図り得ることに加えて、防錆処理が不要になる点で好適であるとの結論に達したのである。
【０００９】
しかしながら、アンカーとして、ねじ節鉄筋を用いる場合は、これにナットを螺合させることで、アンカーに容易に張力を付与させることができるのであるが、繊維製等の棒状部材では、これに雄ねじ部を備えてナットで締め固めることが技術的に不能であって、棒状部材に張力を付与させる術がなかったのである。
【００１０】
別の観点から、プレストレストコンクリート構造物の緊張材や海洋構造物の接合用緊張材などとして、繊維製等の非金属製の棒状部材を用いる場合も、上記と同様の問題が生じるのであった。
【００１１】
本発明は、かゝる実情に鑑みてなされたものであって、その目的は、繊維製等の非金属製の棒状部材であっても、これを確実に挟着して張力を付与できる棒状部材の締結装置を提供することである。
【００１２】
【課題を解決するための手段】
即ち、本発明による棒状部材の締結装置は、スペーサ構造やその他の構造物などの支圧部材に雌ねじ部材を当接させて、繊維製等の棒状部材に張力を付与させるためのものであって、棒状部材の挿通孔を中心部に備えた中空の雄ねじ部材に、周方向に間隔を隔てて且つ一端側から他端側に向けて複数本のスリットを形成すると共に、スリット間の分割ねじ部を一端側ほど拡径させて、雄ねじ部材の他端側から一端側への雌ねじ部材の螺進に伴って分割ねじ部を縮径させるように構成する一方、分割ねじ部の縮径に伴って棒状部材を直径方向で挟着するための棒状部材の挟着手段を備えてなり、この棒状部材の挟着手段が、棒状部材と拡径された分割ねじ部との間に介装されて、分割ねじ部の縮径に伴って縮径される割りリングからなる点に特徴がある（請求項１）。
【００１３】
あるいは、棒状部材の挿通孔を中心部に備えた中空の雄ねじ部材に、周方向に間隔を隔てて且つ一端側から他端側に向けて複数本のスリットを形成すると共に、スリット間の分割ねじ部を一端側ほど拡径させて、雄ねじ部材の他端側から一端側への雌ねじ部材の螺進に伴って分割ねじ部を縮径させるように構成する一方、分割ねじ部の縮径に伴って棒状部材を直径方向で挟着するための棒状部材の挟着手段を備えてなり、この棒状部材の挟着手段が、棒状部材と拡径された分割ねじ部との間に介装されて、分割ねじ部の縮径に伴って分割ねじ部と棒状部材との間で圧縮変形し、かつ、棒状部材の表面部を押圧する弾性部材からなる点に特徴がある（請求項２）
【００１４】
【００１５】
上記の構成によれば、雄ねじ部材の挿通孔に棒状部材を挿通させつつ、この雄ねじ部材の一端側を支圧部材に当接させて、雄ねじ部材の他端側から一端側に向けて雌ねじ部材を螺進させると、この雌ねじ部材の螺進に伴って雄ねじ部材の分割ねじ部が縮径することで、棒状部材は、挟着手段によって直径方向で挟着されることになる。
【００１６】
この挟着によって、雄ねじ部材と棒状部材との一体化が成されるのであり、ここで更に雌ねじ部材を螺進させて、雌ねじ部材を支圧部材に当接させ、この状態で更に雌ねじ部材を螺進させると、支圧部材を反力点にして、棒状部材に張力が付与されることになる。
【００１７】
従って、本発明にかゝる特異な構成の締結装置によれば、ナットを螺合させ得ない棒状部材であっても、これに張力を付与させ得ることから、例えば法面の補強工法に用いるアンカーや、その他の構造物の緊張材などとして、これを軽量の例えば繊維製等の棒状部材を選択することで、取り扱い並びに施工性の向上が達成されるのである。
【００１８】
雌ねじ部材を螺進させて、分割ねじ部を縮径させる上で、上記の構成による締結装置に、雌ねじ部材の螺進に伴っての雄ねじ部材の共回り防止手段を備えることが望ましく（請求項３）、この共回り防止手段として、棒状部材の断面形状を楕円形状にする一方、雄ねじ部材の中心部に形成の挿通孔を、棒状部材の楕円周面に係止して雄ねじ部材の回転を防止する形状に形成する形態（請求項４）や、分割ねじ部の縮径を許容させる状態で、分割ねじ部の少なくとも一つを係止する係止部を、棒状部材装着用の支圧部材に形成する形態（請求項５）を選択することができる。
【００１９】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図１及び図２は法面Ｎ上へのモルタル（またはコンクリート）１の吹き付けによる鉄筋入り格子状法枠２の施工状況を示しており、この施工に際して、法面表層の剥落に対して強い抵抗力を発現させるために、格子状に配筋する鉄筋３，３の交差部にアンカー導入用のスペーサ構造４を設置するようにしている。
【００２０】
このスペーサ構造４は、格子状法枠２の上部側にアンカー５の頭部を露出させるものであって、図３に示すように、法面Ｎ側への載置面板６と、アンカー挿通空間（図２を参照）Ｐの構成部材７、及び、アンカー５の頭部側に装着される締結装置８の受け面板９とを備えてなる。
【００２１】
具体的には、スペーサ構造４は金属製（その他、強化プラスチック製やセラミック製、コンクリート製などが任意に選択される。）であって、法面Ｎ側への載置面板６と締結装置８の受け面板９とを、それぞれフラットな板状部材から構成し、かつ、一方の受け面板９にアンカー５の外径よりもやゝ大きなアンカー挿通孔ａを形成すると共に、他方の載置面板６には、上記のアンカー挿通孔ａよりも大なるアンカー挿通孔ｂを形成している。
【００２２】
そして、アンカー挿通空間Ｐの構成部材７として、上部側の内径と下部側の内径とがアンカー挿通孔ａ，ｂとほゞ同じの下拡がり形状の筒状部材を選択して、この構成部材７を、受け面板９と載置面板６とにわたって且つアンカー挿通孔ａ，ｂのまわりに同芯上に設けてなる。
【００２３】
ここで、スペーサ構造４を楽に取り扱えるように、この実施の形態では、スペーサ構造４を分割タイプのものに構成している。即ち、アンカー挿通空間Ｐを形成する構成部材７と受け面板９を、例えば溶接によって一体化する一方、これとは別体の載置面板６に、上記の構成部材７を位置決め状態で嵌合保持するための係止片ｅを設けている。
【００２４】
次に、モルタル１の吹き付けによる鉄筋入り格子状法枠２の施工手順の一例を図１及び図２に基づいて説明すると、先ずは、必要に応じて予め均し作業がなされた法面Ｎ上に、目合いが５〜６ｃｍ程度の例えば菱形金網などの網状体１１を敷設し、かつ、補助アンカー１２を適宜の間隔で法面Ｎに打ち込んで、この網状体１１を法面Ｎに固定する。
【００２５】
そして、格子状に配筋される鉄筋３，３の交差部に相当する部位に、深部の硬い地盤に届くアンカー穴１３を形成すると共に、必要に応じて、このアンカー穴１３の口部にウエスなどの詰め物を押し込んで、アンカー穴１３への土砂などの落ち込みを防止し、かつ、このアンカー穴１３のまわりに下地用のモルタル１４を供給して、その表面をアンカー穴１３の中心軸線と直角になるようにフラットに均し、このフラット面をスペーサ構造４の設置部Ｓとして、詰め物を撤去するのである。
【００２６】
次いでアンカー５を、その頭部をスペーサ構造４の上部側に露出させる長さに設定して、これをアンカー穴１３に挿入し、アンカー穴１３に、その上面を法面Ｎよりもやゝ控えさせる状態でグラウト（セメントミルク）１５を注入して、地盤に対するアンカー５の定着を図るのである。
【００２７】
次に、アンカー５の外径よりもやゝ大なるアンカー挿通孔ｃを中央部に形成した鋼板製の受け面材１６を、スペーサ構造４の載置面板６よりも大なる形状のものにして、これのアンカー挿通孔ｃにアンカー５を挿通させる状態で、この受け面材１６をスペーサ構造４の設置部Ｓに配置し、かつ、アンカー挿通孔ｃとアンカー穴１３との中心軸線をほゞ一致させた状態で、適宜に滑り止め用のアンカー１７を打設するのである。
【００２８】
続いて、アンカー挿通孔ｂにアンカー５を挿通させるようにして、スペーサ構造４の載置面板６を受け面材１６上に配置すると共に、構成部材７を一体に備えた受け面板９を、それのアンカー挿通孔ａにアンカー５を挿通させる状態で、かつ、係止片ｅによって位置決めする状態で、それの構成部材７を載置面板６の上部に配置するのである。
【００２９】
次いで、吹き付けモルタル１とアンカー５との縁切り用の筒体２０を、グラウト１５の表面部に達する長さに設定して、これをアンカー５に被せつつ、これのフランジｉを受け面板９に着座させる一方、アンカー５に球面座金２１を嵌合保持させ、かつ、アンカー５に締結装置８を取り付けて、これを締め込み、球面座金２１を反力部材にしてアンカー５を緊張させて、この張力を地盤に伝えることで、法面表層の剥落に対して強い抵抗力を発現させるのである。
【００３０】
そして適宜、締結装置８を含めてアンカー５の頭部に保護キャップＣを被せる一方、上記の作業に並行して、２本の鉄筋３，３を、スペーサ構造４を挟むようにして、かつ、法面全体で格子状を呈するように網状体１１上に配置し、この鉄筋３，３の配置に際して、鉄筋３，３を法面Ｎ上に若干浮かせて保持するために、法枠形成用の枠体２２を鉄筋３，３の長手方向に間隔を隔てて設置するのである。
【００３１】
法枠形成用の枠体２２は、溶接による鉄筋の組み合わせ構造からなるもので、一対の半円形状を呈する枠部材２３，２３と、この枠部材２３，２３を一体化させる連結部材２４，２４と、この連結部材２４，２４にわたる鉄筋保持部材２５，２５とからなる。
【００３２】
この法枠形成用の枠体２２は、その高さが１５〜２０ｃｍ程度で、幅が３０ｃｍ程度であり、かつ、長さが３０〜６０ｃｍ程度のものであって、鉄筋保持部材２５には、平行に配筋する鉄筋３，３の位置保持部ｈ，ｈが逆Ｖの字状に形成されている。
【００３３】
上記の構成によれば、鉄筋３，３を法面Ｎ上に格子状に配置し、かつ、この鉄筋３，３を跨ぐように枠体２２を設置した上で、鉄筋３，３を保持部ｈ，ｈ側に持ち上げて、これを番線などによって鉄筋保持部材２５に結束させることで、鉄筋３，３を法面Ｎ上の所定の高さ位置に保持させることができる。
【００３４】
次に、格子状鉄筋３，３で囲われた部位を植生域とするように、この部位の網状体１１上に養生シート２６を配置すると共に、法枠形成用の枠体２２をモルタル１の吹付け幅および吹付け高さの目安にして、かつ、スペーサ構造４を埋め込むようにして、格子状の鉄筋３，３ならびに法枠形成用の枠体２２にモルタル１を吹き付けるのである。
【００３５】
そして必要ならば、モルタル１の所定の養生後にキャップＣを取り外して、アンカー５に備えた締結装置８を増し締めし、球面座金２１を反力部材にして、アンカー５を更に緊張させて、法面表層の剥落に対して更に強い抵抗力を発現させるのであり、この締結装置８の締め込みに並行して養生シート２６を取り外し、植物種子を含む植生用の厚層基材２７を植生域に吹き付けることで、緑化を伴わせての鉄筋入り格子状法枠２による法面補強の施工を完了するのであり、必要に応じて最終的に、締結装置８を含めてアンカー５の頭部に、上記の取り外した保護キャップＣを被せるのである。
【００３６】
上記の法面補強の施工によれば、法面表層の剥落抑止の抵抗力を、モルタル１による格子状法枠２の重量に頼ることに加えて、アンカー５が剥落抑止の大きな抵抗力を発現することから、急傾斜の法面Ｎであっても、また、地耐力の小さな地盤であっても、これの安定化を効果的に達成することができる。
【００３７】
また、アンカー５に対する締結装置８を格子状法枠２の上部側に露出させることから、締結装置８の締め込みによる施工途中での法面Ｎの安定化はもとより、モルタル１による格子状法枠２の成形後においても、締結装置８の締め直し等のアンカー５に対する後作業も容易に行うことができる。
【００３８】
ここで、この実施の形態では、アンカー５として、取り扱い並びに施工性に優れる軽量な繊維製の棒状部材を選択しており、具体的には、図４に示すように、例えばアラミド繊維やＦＲＰ繊維などの合成樹脂繊維２８をエポキシ樹脂で固化させることに加えて、同じく例えばアラミド繊維などによる紐状繊維２９を表面部に巻付けて、これをエポキシ樹脂で固化させた繊維製の棒状部材をアンカー５としており、このアンカー（以下、棒状部材と言う。）５の断面形状を楕円形に成形している。
【００３９】
この棒状部材５によるアンカー導入の手段では、単純なナットでの締め固めが不能であることは記述した通りであることから、棒状部材５によるアンカーの締め固めを可能にするために、締結装置８を次のように構成している。
【００４０】
即ち、この締結装置８は、金属製のものであって、図５及び図６（Ａ），（Ｂ）に示すように、中心部に棒状部材５の挿通孔３１を備えた中空の雄ねじ部材３２と、この雄ねじ部材３２に螺合される雌ねじ部材３３とから構成し、かつ、雄ねじ部材３２に、周方向に間隔を隔てて且つ一端側から他端側に向けて複数本のスリットｊを形成して、雄ねじ部材３２が一端側ほどやゝ大径になるように、スリットｊ，ｊ間の分割ねじ部３２ａをテーパー状に拡径させ、もって、雄ねじ部材３２の他端側から一端側への雌ねじ部材３３の螺進に伴って分割ねじ部３２ａを縮径させるように構成しているのである。
【００４１】
そして、上記のように分割ねじ部３２ａを拡径させた状態で、棒状部材５の挿通孔３１が楕円形の棒状部材５よりもやゝ大きくなるように、アンカー挿通孔３１をストレートの楕円形に形成して、分割ねじ部３２ａの一端側に肉厚部ｄを形成しているのである。
【００４２】
この肉厚部ｄは、分割ねじ部３２ａの縮径に伴って棒状部材５を直径方向で挟着するもので、この分割ねじ部３２ａに一体に形成された肉厚部ｄつまりは挟着部材によって、棒状部材５の挟着手段３４を構成しているのである。
【００４３】
上記の構成によれば、図７（Ａ），（Ｂ）に示すように、雄ねじ部材３２の一端側を球面座金２１に着座させるように、雄ねじ部材３２を棒状部材５に挿通させて、この雄ねじ部材３２の他端側から一端側に向けて雌ねじ部材３３を螺進させると、図８（Ａ）に示すように、雌ねじ部材３３の螺進に伴って分割ねじ部３２ａが縮径することで、挟着手段３４の挟着部材ｄが棒状部材５を直径方向で挟着するようになる。
【００４４】
この際、図８（Ｂ）にも示すように、棒状部材５の楕円形状に合わせて、雄ねじ部材３２の挿通孔３１を楕円形状にしていることから、棒状部材５に対する雄ねじ部材３２の共回りは確実に防止されるのであり、そして、挟着手段３４の挟着部材ｄが棒状部材５を挟着することは即ち、棒状部材５に対する雄ねじ部材３２の一体化が達成されることであって、従って後は、雌ねじ部材３３を更に螺進させて、この雌ねじ部材３３を球面座金２１に当接させると共に、更に雌ねじ部材３３を螺進させることで、棒状部材５は、スペーサ構造４の受け面板９に着座の球面座金２１を支圧部材にして、この支圧部材２１を反力点にして緊張されるようになる。
【００４５】
即ち、上記の構成による締結装置８によれば、アンカーを繊維製等の軽量なる棒状部材５にしても、また別の観点から、プレストレストコンクリート構造物の緊張材や海洋構造物の接合用緊張材などとして、繊維製等の非金属製の棒状部材を用いる場合であっても、棒状部材５の締め固めが可能になるのであって、取り扱い並びに施工性の向上が達成されるのである。
【００４６】
尚、図７における図中のｍは、例えばエポキシ系の硬化剤であって、必要に応じて、棒状部材５に対する雄ねじ部材３２の装着部に供給されるものであり、この硬化剤ｍが硬化することで、棒状部材５と雄ねじ部材３２との一体化がより一層強固なものとなる。
【００４７】
上記の実施の形態では、棒状部材５の断面形状を楕円形状にする一方、雄ねじ部材３２の挿通孔３１についても、これを棒状部材５の楕円周面に係止して雄ねじ部材３２の回転を防止する楕円形状にして、雌ねじ部材３３の螺進に伴っての雄ねじ部材３２の共回り防止手段３５を構成しているが、この構成に限られるものではない。
【００４８】
即ち、図９に示すように、全ての分割ねじ部３２ａの縮径を許容させる状態で、分割ねじ部３２ａの一つ（この実施の形態では、相対峙する二つ）を係止する係止部ｎを、棒状部材装着用の支圧部材（球面座金２１）に形成する構成によっても、雌ねじ部材３３に対する雄ねじ部材３２の共回り防止手段３５とすることができる。
【００４９】
また、棒状部材５の挟着手段３４として、図１０に示すように、分割ねじ部３２ａの一端側の内面側に挟着部材ｄを突出させる構成にして実施可能であり、この他にも、図１１に示すように、分割ねじ部３２ａの縮径に伴って分割ねじ部３２ａと棒状部材５との間で圧縮変形し、かつ、棒状部材５の表面部を押圧する例えば硬質ゴムからなる弾性部材ｔを、棒状部材５と拡径された分割ねじ部３２ａとの間に介装させる構成にしても実施可能であり、この弾性部材ｔとして、棒状部材５の表面部に巻き付けるシート状のものや、この実施の形態で示すように、棒状部材５の表面部に被せる筒状のものなどを選択することができる。
【００５０】
また、弾性部材ｔに代えて、図１２に示すように、分割ねじ部３２ａの縮径に伴って縮径される例えば金属製（その他、合成樹脂製など）の割りリングｒを、棒状部材５と拡径された分割ねじ部３２ａとの間に介装させる構成にしても実施可能であり、かつ、図１１に示す構成において、挟着部材ｄを無くするように、分割ねじ部３２ａの肉厚を一定に形成してもよいのである。
【００５１】
【発明の効果】
以上説明したように、本発明によれば、取り扱い並びに施工性の向上を図る上で、法面の補強工法に用いるアンカーや、その他の構造物の緊張材などとして、これを例えば繊維製等の棒状部材を選択した場合であっても、この棒状部材を確実に挟着して、これに張力を付与することが可能な棒状部材の締結装置が提供される。
【図面の簡単な説明】
【図１】モルタルの吹き付けによる鉄筋入り格子状法枠の施工状況を示す斜視図である。
【図２】スペーサ構造の設置説明図である。
【図３】アンカー導入用のスペーサ構造の分解斜視図である。
【図４】繊維製の棒状部材によるアンカーの部分斜視図である。
【図５】雄ねじ部材の斜視図である。
【図６】（Ａ）は雄ねじ部材の縦断面図、（Ｂ）は雄ねじ部材の横断面図である。
【図７】（Ａ）はアンカー締結装置の分解断面図、（Ｂ）はアンカーの締め固め状態を示す断面図である。
【図８】（Ａ）は締結装置によるアンカーの締め固め状態を示す断面図、（Ｂ）は図８（Ａ）のＸ−Ｘ線視における断面図である。
【図９】別の実施の形態による共回り防止手段の分解斜視図である。
【図１０】挟着手段の変形例を示す断面図である。
【図１１】別の実施の形態による挟着手段の断面図である。
【図１２】変形例の挟着手段を構成するための割りリングの斜視図である。
【符号の説明】
５…棒状部材、２１…支圧部材、３１…挿通孔、３２…雄ねじ部材、３２ａ…分割ねじ部、３３…雌ねじ部材、３４…挟着手段、３５…共回り防止手段、ｄ…挟着部材、ｊ…スリット、ｎ…係止部、ｒ…割りリング、ｔ…弾性部材。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fastening device for a rod-shaped member.
[0002]
[Prior art]
As one of the methods to reinforce slopes such as roads and construction sites, after laying a mesh body such as a wire mesh on the slope, rebars and coils are arranged on the mesh body in a grid pattern, and then There is a construction method in which a mortar is sprayed so as to fill a reinforcing bar and a coil, and a lattice-like frame with reinforcing bars is constructed on the slope.
[0003]
According to this construction method, since the method frame has a lattice shape and is continuous vertically and horizontally, a strong resistance against peeling of the slope surface layer can be exhibited.
[0004]
However, in the above construction method, the resistance to restrain the peeling of the sloped surface layer depends only on the weight of the grid-like method frame by mortar, so the resistance on the steep slope may be insufficient. The present inventor has come up with the idea of installing anchors at the intersections of the grid-like reinforcing bars.
[0005]
That is, a hole for anchor installation is drilled at the intersection of the grid-like reinforcing bars so that it can reach the hard ground, the anchor is inserted through this anchor hole, and the anchor is filled with grout to fix the anchor. On the other hand, the anchor fixing spacer structure is installed so that the head of the anchor is exposed on the upper side of the grid-like frame by spraying the mortar, and the nut is screwed into the anchor. And the anchor is tightened by screwing the nut so that the tension is applied to the anchor as a reaction member. The tension applied to the anchor is transmitted to the ground.
[0006]
According to this anchor introduction method, since the anchor exhibits a great resistance to delamination, even if it is a steep slope, it can be used as a construction target for the lattice method frame.
[0007]
[Problems to be solved by the invention]
However, depending on the slope, in order to reach the anchor to the deep hard ground, a large number of long anchors may be required, and as the anchor, for example, a screw rebar that can generally be screwed with a nut. However, in the threaded joint, since it becomes heavier as it becomes longer, there is room for improvement in terms of handling and workability.
[0008]
Here, as a result of further earnest research and development, the present inventor can improve the handling surface and the workability by selecting a non-metallic lightweight rod-shaped member such as a fiber as the anchor. In addition, it has been concluded that it is preferable in that the rust prevention treatment is unnecessary.
[0009]
However, when a threaded bar is used as an anchor, it is possible to easily apply tension to the anchor by screwing a nut into this, but in a rod-like member made of fiber, etc. It was technically impossible to tighten with a nut and there was no way to apply tension to the rod-shaped member.
[0010]
From another viewpoint, the same problem as described above also occurs when a non-metallic rod-shaped member made of fiber or the like is used as a tension material for a prestressed concrete structure or a tension material for joining an offshore structure.
[0011]
The present invention has been made in view of such circumstances, and the purpose thereof is a rod-like member that can securely pinch and apply tension even to a non-metallic rod-like member made of fiber or the like. It is to provide a fastening device for members.
[0012]
[Means for Solving the Problems]
In other words, the rod-shaped member fastening device according to the present invention is for bringing a female screw member into contact with a supporting member such as a spacer structure or other structure and applying tension to the fiber-shaped rod-shaped member. In addition, a hollow male screw member having an insertion hole for a rod-like member at the center portion is formed with a plurality of slits spaced from each other in the circumferential direction and from one end side to the other end side, and a divided screw portion between the slits The diameter of the split screw portion is reduced as the female screw member advances from the other end side of the male screw member to the one end side, while the diameter of the split screw portion is reduced. rod member Ri Na comprise clamping means of the rod-like member for pinched at diametric, clamping means of the bar-like member, is interposed between the rod-like member and the expanded diameter have been divided threaded section , especially in that consists of a split ring which is reduced in diameter along with the reduced diameter of the split threaded portion It is (claim 1).
[0013]
Alternatively, a plurality of slits are formed in a hollow male screw member having an insertion hole for a rod-like member in the center portion at intervals in the circumferential direction and from one end side to the other end side, and a split screw between the slits The diameter of the part is enlarged toward one end side, and the split screw part is reduced in diameter as the female screw member is screwed from the other end side to the one end side of the male screw member. A rod-shaped member clamping means for clamping the rod-shaped member in the diametrical direction, and the rod-shaped member clamping means is interposed between the rod-shaped member and the enlarged divided screw portion. A feature is that it is composed of an elastic member that compresses and deforms between the split screw portion and the rod-like member in accordance with the diameter reduction of the split screw portion and presses the surface portion of the rod-like member (claim 2).
[0014]
[0015]
According to said structure, while inserting a rod-shaped member in the insertion hole of a male screw member, the one end side of this male screw member is made to contact | abut to a support member, and a female screw member is directed toward the one end side from the other end side of a male screw member. As the female screw member is screwed, the split screw portion of the male screw member is reduced in diameter with the screwing of the female screw member, so that the rod-like member is clamped in the diametrical direction by the clamping means.
[0016]
By this clamping, the male screw member and the rod-shaped member are integrated. Here, the female screw member is further screwed to bring the female screw member into contact with the supporting member, and in this state, the female screw member is further moved. When it is screwed, tension is applied to the rod-shaped member using the supporting member as a reaction point.
[0017]
Therefore, according to the fastening device having a unique configuration according to the present invention, even if it is a rod-like member that cannot be screwed onto the nut, tension can be applied to the rod-like member. By selecting a lightweight rod-like member such as a fiber as an anchor or a tension member for other structures, an improvement in handling and workability can be achieved.
[0018]
In order to reduce the diameter of the split screw portion by screwing the female screw member, it is desirable that the fastening device having the above-described configuration be provided with a means for preventing the male screw member from rotating together with the screwing of the female screw member. 3 ) As this co-rotation preventing means, the cross-sectional shape of the rod-shaped member is made elliptical, while the insertion hole formed in the center of the male screw member is locked to the elliptical circumferential surface of the rod-shaped member to rotate the male screw member. A supporting pressure member for mounting a rod-shaped member is provided in the form to be formed in the shape to be prevented (Claim 4 ) or the locking portion for locking at least one of the divided screw portions in a state in which the reduced diameter of the divided screw portion is allowed. It is possible to select the form to be formed (claim 5 ).
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show the construction status of a reinforcing steel lattice method frame 2 by spraying mortar (or concrete) 1 on the slope N, and in this construction, strong resistance against peeling of the slope surface layer. In order to express force, the spacer structure 4 for introducing an anchor is installed at the intersection of the reinforcing bars 3 and 3 arranged in a lattice pattern.
[0020]
This spacer structure 4 exposes the head of the anchor 5 on the upper side of the lattice-like method frame 2 and, as shown in FIG. 3, a mounting surface plate 6 on the normal surface N side, and an anchor insertion space. (Refer FIG. 2) The structural member 7 of P and the receiving surface board 9 of the fastening apparatus 8 with which the head side of the anchor 5 is mounted | worn are provided.
[0021]
Specifically, the spacer structure 4 is made of metal (others such as reinforced plastic, ceramic, and concrete are arbitrarily selected), and the placing face plate 6 and the fastening device 8 on the slope N side. The receiving face plate 9 is composed of a flat plate-like member, and an anchor insertion hole a which is slightly larger than the outer diameter of the anchor 5 is formed in one receiving face plate 9 and the other placing face plate 6 is formed. An anchor insertion hole b larger than the anchor insertion hole a is formed.
[0022]
Then, as the constituent member 7 of the anchor insertion space P, a cylindrical member having an upper side inner diameter and a lower side inner diameter substantially the same as the anchor insertion holes a and b is selected. Is provided concentrically over the receiving face plate 9 and the placement face plate 6 and around the anchor insertion holes a and b.
[0023]
In this embodiment, the spacer structure 4 is configured as a split type so that the spacer structure 4 can be handled easily. That is, the component member 7 and the receiving surface plate 9 that form the anchor insertion space P are integrated by welding, for example, while the component member 7 is fitted and held in a positioning state on a separate mounting surface plate 6. A locking piece e is provided.
[0024]
Next, an example of the construction procedure of the rebar-reinforced grid method frame 2 by spraying the mortar 1 will be described with reference to FIGS. 1 and 2. First, on the slope N where the leveling work has been performed in advance as necessary. Further, a mesh body 11 such as a rhombus wire mesh having a mesh of about 5 to 6 cm is laid, and the auxiliary anchor 12 is driven into the slope N at an appropriate interval, and the mesh body 11 is fixed to the slope N. .
[0025]
Then, an anchor hole 13 reaching the deep hard ground is formed at a portion corresponding to the intersection of the reinforcing bars 3 and 3 arranged in a lattice shape, and a waste cloth is formed at the mouth of the anchor hole 13 as necessary. The mortar 14 is supplied around the anchor hole 13 so that the surface of the anchor hole 13 is perpendicular to the central axis of the anchor hole 13. The flat surface is used as an installation portion S of the spacer structure 4 and the padding is removed.
[0026]
Next, the anchor 5 is set to such a length that its head is exposed to the upper side of the spacer structure 4, and this is inserted into the anchor hole 13. In this state, grout (cement milk) 15 is injected to fix the anchor 5 to the ground.
[0027]
Next, the receiving surface material 16 made of a steel plate in which the anchor insertion hole c that is slightly larger than the outer diameter of the anchor 5 is formed in the central portion is formed in a shape larger than the mounting surface plate 6 of the spacer structure 4. In the state in which the anchor 5 is inserted into the anchor insertion hole c, the receiving surface material 16 is disposed in the installation portion S of the spacer structure 4, and the center axis line between the anchor insertion hole c and the anchor hole 13 is approximately An anti-slip anchor 17 is appropriately placed in the matched state.
[0028]
Subsequently, the mounting surface plate 6 of the spacer structure 4 is disposed on the receiving surface material 16 so that the anchor 5 is inserted through the anchor insertion hole b, and the receiving surface plate 9 integrally provided with the component member 7 is provided. In the state where the anchor 5 is inserted through the anchor insertion hole a and the state where the anchor 5 is positioned by the locking piece e, the constituent member 7 is arranged on the upper portion of the mounting face plate 6.
[0029]
Next, the cylinder 20 for cutting the edge between the spraying mortar 1 and the anchor 5 is set to a length that reaches the surface portion of the grout 15, and this flange i is seated on the face plate 9 while covering the anchor 5. On the other hand, the spherical washer 21 is fitted and held on the anchor 5, and the fastening device 8 is attached to the anchor 5 and tightened, and the anchor 5 is tensioned using the spherical washer 21 as a reaction member. By conveying to the ground, a strong resistance against the peeling of the slope surface layer is developed.
[0030]
As appropriate, the protective cap C is put on the head of the anchor 5 including the fastening device 8, while the two reinforcing bars 3 and 3 are sandwiched by the spacer structure 4 in parallel with the above operation, and the slope A frame for forming a normal frame is arranged on the net 11 so as to form a lattice shape as a whole, and in order to hold the reinforcing bars 3 and 3 slightly floating on the slope N when the reinforcing bars 3 and 3 are arranged. 22 is installed at intervals in the longitudinal direction of the reinforcing bars 3 and 3.
[0031]
The frame 22 for forming the normal frame is composed of a combination of reinforcing bars by welding, and includes a pair of semicircular frame members 23 and 23 and connecting members 24 and 24 that integrate the frame members 23 and 23. And reinforcing bar holding members 25, 25 extending over the connecting members 24, 24.
[0032]
The frame 22 for forming the method frame has a height of about 15 to 20 cm, a width of about 30 cm, and a length of about 30 to 60 cm. Position holding portions h and h of the reinforcing bars 3 and 3 arranged in parallel are formed in an inverted V shape.
[0033]
According to said structure, after arrange | positioning the reinforcing bars 3 and 3 on the slope N in a grid | lattice form, and installing the frame 22 so that this reinforcing bars 3 and 3 may be straddled, the reinforcing bars 3 and 3 are hold | maintained The reinforcing bars 3 and 3 can be held at a predetermined height position on the slope N by lifting them to the h and h sides and binding them to the reinforcing bar holding member 25 with a wire or the like.
[0034]
Next, the curing sheet 26 is arranged on the mesh body 11 of this part so that the part surrounded by the latticed reinforcing bars 3 and 3 is a vegetation area, and the frame 22 for forming the normal frame is attached to the mortar 1. The mortar 1 is sprayed on the grid-like reinforcing bars 3 and 3 and the frame body 22 for forming the frame by using the spray width and spray height as a guideline and embedding the spacer structure 4.
[0035]
If necessary, the cap C is removed after predetermined curing of the mortar 1, the fastening device 8 provided to the anchor 5 is tightened, the spherical washer 21 is used as a reaction force member, and the anchor 5 is further tensioned. In order to develop a stronger resistance against peeling of the surface layer, the curing sheet 26 is removed in parallel with the fastening of the fastening device 8, and a thick layer base material 27 for vegetation including plant seeds is formed in the vegetation area. By spraying, it completes the construction of the slope reinforcement by the rebar-containing grid-like method frame 2 with greening, and finally, if necessary, including the fastening device 8 on the head of the anchor 5, The removed protective cap C is put on.
[0036]
According to the construction of the above-mentioned slope reinforcement, in addition to relying on the weight of the grid-like method frame 2 by the mortar 1 for the resistance to prevent the peeling of the slope surface layer, the anchor 5 exhibits a great resistance to the prevention of peeling. Therefore, even if the slope N is steeply inclined or the ground has a small ground strength, stabilization of the ground can be effectively achieved.
[0037]
Further, since the fastening device 8 for the anchor 5 is exposed on the upper side of the grid-like method frame 2, not only is the slope N stabilized during the construction by tightening the fastening device 8, but also the grid-like method frame by the mortar 1. Even after the molding of 2, the post work for the anchor 5 such as retightening of the fastening device 8 can be easily performed.
[0038]
Here, in this embodiment, a lightweight fiber rod-like member excellent in handling and workability is selected as the anchor 5. Specifically, as shown in FIG. 4, for example, an aramid fiber or FRP fiber is used. In addition to solidifying the synthetic resin fiber 28 with an epoxy resin, for example, a string-like fiber 29 made of, for example, an aramid fiber is wound around the surface portion, and the fiber rod-shaped member solidified with the epoxy resin is anchored. The cross-sectional shape of this anchor (hereinafter referred to as a rod-like member) 5 is formed into an elliptical shape.
[0039]
In this means for introducing the anchor by the rod-shaped member 5, as described above, it is impossible to compact with a simple nut. Therefore, in order to enable the anchor compaction by the rod-shaped member 5, the fastening device 8 is used. Is configured as follows.
[0040]
That is, the fastening device 8 is made of metal and has a hollow male screw member provided with an insertion hole 31 for the rod-like member 5 at the center as shown in FIGS. 5 and 6A and 6B. 32 and a female screw member 33 screwed into the male screw member 32, and a plurality of slits j are formed in the male screw member 32 at intervals in the circumferential direction and from one end side to the other end side. The split screw portion 32a between the slits j and j is increased in a taper shape so that the male screw member 32 has a larger diameter toward the one end side, so that one end side from the other end side of the male screw member 32 is formed. The split screw portion 32a is configured to have a reduced diameter as the female screw member 33 advances.
[0041]
Then, the anchor insertion hole 31 is formed into a straight elliptical shape so that the insertion hole 31 of the rod-shaped member 5 is slightly larger than the elliptical rod-shaped member 5 in a state where the divided screw portion 32a is expanded in diameter as described above. The thick part d is formed in the one end side of the division | segmentation screw part 32a.
[0042]
The thick part d is for sandwiching the rod-like member 5 in the diameter direction as the divided screw part 32a is reduced in diameter, and the thick part d, that is, a sandwiching member formed integrally with the divided screw part 32a. Thus, the clamping means 34 of the rod-shaped member 5 is configured.
[0043]
According to the above configuration, as shown in FIGS. 7A and 7B, the male screw member 32 is inserted through the rod-like member 5 so that one end side of the male screw member 32 is seated on the spherical washer 21. When the female screw member 33 is screwed from the other end side to the one end side of the male screw member 32, the split screw portion 32a is reduced in diameter as the female screw member 33 is screwed as shown in FIG. Thus, the sandwiching member d of the sandwiching means 34 sandwiches the rod-shaped member 5 in the diameter direction.
[0044]
At this time, as shown in FIG. 8B, since the insertion hole 31 of the male screw member 32 has an elliptical shape in accordance with the elliptical shape of the rod-shaped member 5, the male screw member 32 rotates together with the rod-shaped member 5. Is securely prevented, and the clamping member d of the clamping means 34 clamps the rod-shaped member 5, that is, the integration of the male screw member 32 with the rod-shaped member 5 is achieved. Therefore, after that, the female screw member 33 is further screwed, the female screw member 33 is brought into contact with the spherical washer 21, and the female screw member 33 is further screwed, so that the rod-like member 5 is received by the spacer structure 4. A spherical washer 21 seated on the face plate 9 is used as a supporting member, and the supporting member 21 is used as a reaction point to be tensioned.
[0045]
That is, according to the fastening device 8 configured as described above, the anchor is made of a light bar member 5 made of fiber or the like, and from another point of view, the tension material for the prestressed concrete structure or the tension material for joining the marine structure. For example, even when a non-metallic rod-like member made of fiber or the like is used, the rod-like member 5 can be compacted, and the handling and workability can be improved.
[0046]
Note that m in FIG. 7 is, for example, an epoxy-based curing agent, and is supplied to the mounting portion of the male screw member 32 with respect to the rod-shaped member 5 as necessary. This curing agent m is cured. By doing so, the integration of the rod-shaped member 5 and the male screw member 32 becomes even stronger.
[0047]
In the above embodiment, the cross-sectional shape of the rod-shaped member 5 is elliptical, and the insertion hole 31 of the male screw member 32 is also locked to the elliptical circumferential surface of the rod-shaped member 5 to rotate the male screw member 32. Although the oval shape is prevented and the co-rotation preventing means 35 of the male screw member 32 is configured as the female screw member 33 is screwed, it is not limited to this configuration.
[0048]
That is, as shown in FIG. 9, a latch that latches one of the split screw portions 32 a (two that are opposed to each other in this embodiment) in a state in which the diameter reduction of all the split screw portions 32 a is allowed. Even if the portion n is formed in the bearing member (spherical washer 21) for mounting the rod-shaped member, it can be used as the means 35 for preventing the male screw member 32 from rotating together with the female screw member 33.
[0049]
Moreover, as the clamping means 34 of the rod-shaped member 5, as shown in FIG. 10, it can be implemented with a configuration in which the clamping member d protrudes from the inner surface side of one end side of the split screw portion 32a. As shown in FIG. 11, an elastic material made of, for example, hard rubber that compresses and deforms between the divided screw portion 32 a and the rod-like member 5 along with the reduced diameter of the divided screw portion 32 a and presses the surface portion of the rod-like member 5. It is also possible to implement a configuration in which the member t is interposed between the rod-shaped member 5 and the divided screw portion 32a having an enlarged diameter. As the elastic member t, a sheet-shaped member wound around the surface portion of the rod-shaped member 5 Alternatively, as shown in this embodiment, a cylindrical member that covers the surface portion of the rod-like member 5 can be selected.
[0050]
Moreover, instead of the elastic member t, as shown in FIG. 12, a split ring r made of, for example, metal (others such as synthetic resin) is reduced in accordance with the reduced diameter of the divided screw portion 32a. And the split screw portion 32a having a larger diameter can be implemented, and in the configuration shown in FIG. 11, the thickness of the split screw portion 32a is eliminated so as to eliminate the clamping member d. The thickness may be formed constant.
[0051]
【The invention's effect】
As described above, according to the present invention, in order to improve handling and workability, as an anchor used for a slope reinforcement method, a tension member of other structures, etc., this is made of, for example, fiber. Even when a rod-shaped member is selected, a rod-shaped member fastening device that can securely clamp the rod-shaped member and apply tension to the rod-shaped member is provided.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view showing a construction situation of a lattice method frame with reinforcing bars by spraying mortar.
FIG. 2 is an installation explanatory diagram of a spacer structure.
FIG. 3 is an exploded perspective view of a spacer structure for introducing an anchor.
FIG. 4 is a partial perspective view of an anchor using a fiber rod-shaped member.
FIG. 5 is a perspective view of a male screw member.
6A is a longitudinal sectional view of a male screw member, and FIG. 6B is a transverse sectional view of the male screw member.
7A is an exploded cross-sectional view of the anchor fastening device, and FIG. 7B is a cross-sectional view showing a state in which the anchor is compacted.
8A is a cross-sectional view showing a state in which an anchor is compacted by a fastening device, and FIG. 8B is a cross-sectional view taken along line XX in FIG. 8A.
FIG. 9 is an exploded perspective view of co-rotation preventing means according to another embodiment.
FIG. 10 is a cross-sectional view showing a modified example of the clamping means.
FIG. 11 is a cross-sectional view of clamping means according to another embodiment.
FIG. 12 is a perspective view of a split ring for constituting a sandwiching means of a modified example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5 ... Bar-shaped member, 21 ... Supporting member, 31 ... Insertion hole, 32 ... Male screw member, 32a ... Split screw part, 33 ... Female screw member, 34 ... Clamping means, 35 ... Common rotation prevention means, d ... Clamping member , J ... slit, n ... locking portion, r ... split ring, t ... elastic member.

Claims

A plurality of slits are formed in a hollow male screw member having an insertion hole for a rod-like member in the center portion at intervals in the circumferential direction and from one end side to the other end side, and a split screw portion between the slits is formed. The diameter of the divided screw portion is increased as the one end side is expanded, and the divided screw portion is reduced in diameter as the female screw member is screwed from the other end side to the one end side of the male screw member. member Ri Na comprise clamping means of the rod-like member for pinched at diametric, clamping means of the bar-like member, is interposed between the rod-like member and the expanded diameter have been divided threaded section, A rod-shaped member fastening device comprising a split ring having a diameter reduced in accordance with a diameter reduction of a divided screw portion .

A plurality of slits are formed in a hollow male screw member having an insertion hole for a rod-like member in the center portion at intervals in the circumferential direction and from one end side to the other end side, and a split screw portion between the slits is formed. The diameter of the divided screw portion is increased as the one end side is expanded, and the divided screw portion is reduced in diameter as the female screw member is screwed from the other end side to the one end side of the male screw member. A rod-shaped member clamping means for clamping the member in the diametrical direction is provided, and the rod-shaped member clamping means is interposed between the rod-shaped member and the divided screw portion having an enlarged diameter to divide the member. A fastening device for a rod-shaped member, comprising an elastic member that compresses and deforms between the split screw portion and the rod-shaped member in accordance with the diameter reduction of the threaded portion and presses the surface portion of the rod-shaped member.

The fastening device for a rod-shaped member according to claim 1 or 2 , further comprising means for preventing co-rotation of the male screw member as the female screw member is screwed.

To configure the co-rotation prevention means, the rod-shaped member has an elliptical cross-sectional shape, while the insertion hole formed in the center of the male screw member is locked to the elliptical circumferential surface of the rod-shaped member to prevent the male screw member from rotating. The rod-shaped member fastening device according to claim 3 , wherein the fastening device is formed into a shape to be formed.

In order to constitute the co-rotation preventing means, a locking portion for locking at least one of the divided screw portions is formed on the supporting member for mounting the rod-like member in a state in which the reduced diameter of the divided screw portion is allowed. The fastening device of the rod-shaped member described in Claim 3 or 4 .