JP7429382B2 - Tightening anchor and its construction method - Google Patents

Tightening anchor and its construction method Download PDF

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JP7429382B2
JP7429382B2 JP2020015365A JP2020015365A JP7429382B2 JP 7429382 B2 JP7429382 B2 JP 7429382B2 JP 2020015365 A JP2020015365 A JP 2020015365A JP 2020015365 A JP2020015365 A JP 2020015365A JP 7429382 B2 JP7429382 B2 JP 7429382B2
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tapered
expansion member
diameter
expansion
groove
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洋一 窪田
展生 野村
正人 山田
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株式会社ケー・エフ・シー
株式会社中外精工
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Description

本発明は、ナット締めでテーパボルトのテーパ部を拡開部材に引き込んで拡開羽根を拡開させ、コンクリート躯体に設置される締付式アンカー及びその施工方法に関する。 The present invention relates to a tightening type anchor that is installed in a concrete structure by pulling the tapered part of a tapered bolt into an expanding member by tightening a nut and expanding expansion blades, and a method for constructing the same.

従来、コンクリート躯体に設置されるあと施工式の拡張アンカーとして打込み式アンカーと締付式アンカーが知られている。打込み式アンカーは、コンクリート躯体の削孔にアンカーを挿入した後、筒状の本体、スリーブ或いは芯棒を打ち込んで拡開羽根を拡開させ、コンクリート躯体に圧着するものである。これに対して、締付式アンカーは、コンクリート躯体の削孔にアンカーを挿入した後、ナット締めでテーパボルトのテーパ部を拡開部材に引き込んで拡開羽根を拡開させ、コンクリート躯体に圧着するものである（特許文献１参照）。打込み式アンカーの設置は手ハンマーでの打込みが一般的であり、通常、施工確認は、打込みの手ごたえとアンカーの出代の長さを計測して行われるが、締付式アンカーは、締付トルク値によっての施工管理が可能であるため、施工の確実性に優れており、例えば天井部等の上向き施工でも確実な施工を行うことができる。 Conventionally, driving-type anchors and tightening-type anchors are known as post-installation expansion anchors that are installed in concrete structures. A drive-in anchor is one in which the anchor is inserted into a hole in a concrete body, and then a cylindrical main body, sleeve, or core rod is driven in to expand the expansion blades, and the anchor is crimped onto the concrete body. On the other hand, with a tightening type anchor, after inserting the anchor into a hole in the concrete body, tighten the nut to draw the tapered part of the taper bolt into the expansion member, expand the expansion blades, and press it into the concrete body. (See Patent Document 1). Driving-type anchors are generally installed by hand hammering, and installation is usually confirmed by measuring the driving response and the length of the anchor's protrusion. Since construction management can be performed using torque values, the construction is highly reliable, and can be performed reliably even when working upwards, such as on ceilings.

また、別の公知技術として、ナット本体の内側に突出するようにフリクション片を設け、ボルトの雄ねじ部のねじ山にフリクション片を係合させて弾性変形させ、プリベリングトルクを発生させる緩み止めナットが知られている（特許文献２、３参照）。 Another known technique is a locking nut in which a friction piece is provided so as to protrude inside the nut body, and the friction piece is engaged with the thread of the male thread of the bolt to be elastically deformed to generate prevailing torque. is known (see Patent Documents 2 and 3).

特開２００８－１８５０７６号公報Japanese Patent Application Publication No. 2008-185076 特開２００１－１５９４１５号公報Japanese Patent Application Publication No. 2001-159415 特開２０１５－１０２２０７号公報Japanese Patent Application Publication No. 2015-102207

ところで、コンクリート躯体に設置したアンカーとナットで取付物が取り付けられている場合、交通振動等に起因してナットが緩み、緩んだナットの脱落で取付物が落下する可能性がある。そのため、アンカー用のナットとして、特許文献２、３のようなねじ山にフリクション片を介在させる緩み止めナットを用いることが望まれている。 By the way, when an attachment is attached to a concrete framework using an anchor and a nut, the nut may loosen due to traffic vibration, etc., and the attachment may fall due to the loosened nut falling off. Therefore, it is desired to use a locking nut in which a friction piece is interposed in the thread as disclosed in Patent Documents 2 and 3 as a nut for an anchor.

しかしながら、この種の緩み止めナットはボルトへの螺入時にもプリベリングトルクが作用するため、締付式アンカーに適用すると、フリクション片がテーパボルトの雄ねじ山に噛んで緩み止めナットと共にテーパボルトが供回りしてしまい、緩み止めナットを締めてもテーパボルトのテーパ部が拡開部材に引き込まれず、所定の拡開羽根の拡開がなされないことになる。そのため、締付式アンカーに緩み止めナットを適用してナットの緩み止めを行うことは困難であった。 However, since the prevailing torque acts on this type of locking nut when it is screwed into the bolt, when applied to a tightening type anchor, the friction piece bites into the male thread of the taper bolt, causing the taper bolt to rotate together with the locking nut. As a result, even if the locking nut is tightened, the tapered portion of the tapered bolt will not be drawn into the expansion member, and the expansion blades will not be expanded to the desired extent. Therefore, it has been difficult to apply a locking nut to a tightening type anchor to prevent the nut from loosening.

本発明は上記課題に鑑み提案するものであって、緩み止めナットを適用しても適正に拡開部材を拡開してコンクリート躯体に確実に定着することができると共に、ナットの緩み止めを行うことができる締付式アンカー及びその施工方法を提供することを目的とする。 The present invention is proposed in view of the above-mentioned problems, and even if a locking nut is applied, the expanding member can be properly expanded and securely fixed to the concrete structure, and the nut can be prevented from loosening. The purpose of the present invention is to provide a tightening type anchor that can be tightened and a method for constructing the same.

本発明の締付式アンカーは、軸部の前側に縮径部とテーパ部が順に設けられ、前記軸部の後側に雄ねじ部が設けられているテーパボルトと、前記テーパ部の引き込みに応じて拡開する拡開羽根が溝部で区分して形成され、前記縮径部に外嵌されている拡開部材と、前記雄ねじ部に螺合され、前記雄ねじ部への係合で弾性変形するフリクション片が設けられている緩み止めナットを備える締付式アンカーであって、前記テーパ部のテーパ面に、前記拡開部材への前記テーパ部の引き込みに応じて前記溝部の少なくとも１つに入り込んで係合する係合突起が設けられ、非拡開状態の前記拡開部材の半径方向の最外端に外接する外接円の径が、前記テーパ部の最大外径以上で且つアンカー設置対象のコンクリート躯体の削孔径と略同一に設定されていることを特徴とする。
これによれば、拡開部材へのテーパ部の引き込みに応じて係合突起が溝部に係合し、この係合で緩み止めナットとテーパボルトの供回りが防止された状態で、締付式アンカーの拡開羽根の拡開が適正に行なわれる。従って、緩み止めナットを適用しても適正に拡開部材を拡開して締付式アンカーをコンクリート躯体に確実に定着することができる。また、拡開部材の適正な拡開を妨げずに緩み止めナットを適用することが可能であることから、ナットの緩み止めを行うことができる。また、緩み止めナットのテーパボルトへの螺入では、拡開部材もテーパボルトと供回りすることが懸念されるが、拡開部材の半径方向の最外端に外接する外接円の径をコンクリート躯体の削孔径と略同一に設定することにより、締付式アンカーをコンクリート躯体の削孔内に挿入した時点で拡開部材の半径方向の最外端と孔壁との摩擦力を高め、拡開部材がテーパボルトと供回りしてしまうことを防ぎ、テーパ部の拡開部材への引き込みの当初から拡開部材を削孔に対して配置固定した状態で、拡開羽根の拡開動作を行うことができる。また、拡開部材の半径方向の最外端に外接する外接円の径をテーパボルトのテーパ部の最大外径以上とすることにより、上記の拡開部材の供回りを防止すると同時に、締付式アンカー或いはテーパボルトと拡開部材の削孔内への挿入をテーパ部が妨げることを無くし、挿入作業を確実且つスムーズに行うことが可能となる。 The tightening type anchor of the present invention includes a tapered bolt in which a diameter reducing part and a tapered part are sequentially provided on the front side of the shaft part, and a male thread part is provided on the rear side of the shaft part, and an expanding member formed by dividing an expanding blade into a groove and fitted onto the reduced diameter portion; and a friction member that is screwed into the male threaded portion and is elastically deformed by engagement with the male threaded portion. A tightening type anchor comprising a locking nut provided with a tab, the tapered surface of the tapered part being fitted into at least one of the grooves in response to retraction of the tapered part into the expansion member. The concrete is provided with an engagement protrusion that engages, the diameter of the circumscribed circle circumscribing the radially outermost end of the expansion member in the non-expanded state is equal to or larger than the maximum outer diameter of the tapered part, and the concrete is the anchor installation target. It is characterized by being set to be approximately the same as the diameter of the hole drilled in the main body.
According to this, the engagement protrusion engages with the groove in response to the drawing of the tapered part into the expansion member, and this engagement prevents the locking nut and the taper bolt from rotating together, and the tightening type anchor The expansion blades are properly expanded. Therefore, even if a locking nut is applied, the expansion member can be expanded appropriately and the tightening type anchor can be reliably fixed to the concrete frame. Furthermore, since the locking nut can be applied without interfering with proper expansion of the expanding member, the nut can be prevented from loosening. In addition, when screwing a locking nut into a tapered bolt, there is a concern that the expansion member may also rotate with the taper bolt. By setting the diameter to be approximately the same as the hole diameter, when the tightening anchor is inserted into the hole in the concrete structure, the frictional force between the outermost radial end of the expansion member and the hole wall is increased, and the expansion member This prevents the blade from rotating with the taper bolt, and allows the expansion blade to be expanded while the expansion member is placed and fixed in the drilled hole from the beginning of the tapered part being drawn into the expansion member. can. In addition, by making the diameter of the circumscribed circle that circumscribes the outermost radial end of the expansion member equal to or larger than the maximum outer diameter of the tapered part of the taper bolt, it is possible to prevent the expansion member from rotating as described above, and at the same time, the tightening method The tapered portion does not obstruct the insertion of the anchor or the tapered bolt and the expansion member into the drilled hole, making it possible to perform the insertion work reliably and smoothly.

本発明の締付式アンカーは、前記係合突起が、前記テーパ部の最大外径より拡大しない高さで前記テーパ面に筋状に形成されていることを特徴とする。
これによれば、コンクリート躯体の削孔へのテーパボルト挿入時に係合突起が孔壁と干渉することがなく、締付式アンカーの施工における作業性に優れる。また、節状に形成された係合突起は拡開部材へのテーパ部の引き込みに応じて円滑に溝部に入り込むことができる。 The tightening type anchor of the present invention is characterized in that the engagement protrusion is formed in a stripe shape on the tapered surface at a height that does not increase beyond the maximum outer diameter of the tapered portion.
According to this, the engagement protrusion does not interfere with the hole wall when inserting the taper bolt into the hole drilled in the concrete frame, and the workability in constructing the tightening type anchor is excellent. Further, the knot-shaped engagement protrusion can smoothly enter the groove portion as the tapered portion is drawn into the expansion member.

本発明の締付式アンカーは、前記拡開部材が断面視略Ｃ字形で形成され、前記溝部が、前記拡開部材の前端から軸方向に切り込まれたスリット溝と、前記拡開部材を軸方向に分断する分断溝で構成され、少なくとも、前記拡開部材への前記テーパ部の引き込みに応じて前記係合突起が前記分断溝に入り込んで係合されることを特徴とする。また、本発明の締付式アンカーは、軸部の前側に縮径部とテーパ部が順に設けられ、前記軸部の後側に雄ねじ部が設けられているテーパボルトと、前記テーパ部の引き込みに応じて拡開する拡開羽根が複数の溝部で区分して形成され、非拡開状態において、前記溝部に入り込んで係合する係合突起が設けられていない前記縮径部に外嵌され且つ前記係合突起に係合されていない断面視略Ｃ字形の拡開部材と、前記雄ねじ部に螺合され、前記雄ねじ部への係合で弾性変形するフリクション片が設けられている緩み止めナットを備える締付式アンカーであって、複数の前記溝部が、前記拡開部材の前端から軸方向に切り込まれたスリット溝と、前記拡開部材を軸方向に分断する１つの分断溝とで構成され、前記テーパ部のテーパ面に、前記拡開部材への前記テーパ部の引き込みに応じて、前記スリット溝と前記分断溝のそれぞれに入り込んで係合する複数の前記係合突起が設けられ、非拡開状態の前記拡開部材の半径方向の最外端に外接する外接円の径が、前記テーパ部の最大外径以上で且つアンカー設置対象のコンクリート躯体の削孔径と略同一に設定されていることを特徴とする。
これによれば、拡開部材を断面視略Ｃ字形で形成することにより、拡開部材の縮径部への外嵌め、取付作業を容易化することができる。拡開部材は、所定形状にカットしたプレート材をプレス加工機でテーパボルトの縮径部に外嵌する加工が可能となる為、経済性に優れる。また、溝幅の可変性が高い分断溝に係合突起を係合することにより、拡開部材へのテーパ部の引き込みに応じて係合突起をより確実に溝部に係合することができ、拡開部材の適正拡開の確実性を一層高めることができる。
 In the tightening type anchor of the present invention, the expansion member has a substantially C-shaped cross section, and the groove portion includes a slit groove cut in the axial direction from the front end of the expansion member, and a slit groove cut in the axial direction from the front end of the expansion member. It is characterized in that it is constituted by a dividing groove that divides in the axial direction, and the engaging protrusion enters and is engaged with the dividing groove in accordance with at least the drawing of the tapered portion into the expanding member. Further, the tightening type anchor of the present invention includes a tapered bolt in which a diameter reducing part and a tapered part are sequentially provided on the front side of the shaft part, and a male thread part is provided on the rear side of the shaft part, and a retracting part of the tapered part. An expansion blade that expands accordingly is formed divided by a plurality of grooves, and in a non-expanded state is fitted onto the reduced diameter portion where no engagement protrusion that enters and engages with the groove is provided; A locking nut that is provided with an expansion member having a substantially C-shape in cross section that is not engaged with the engagement protrusion, and a friction piece that is screwed onto the male threaded portion and is elastically deformed by engagement with the male threaded portion. A tightening type anchor, wherein the plurality of grooves include a slit groove cut in the axial direction from the front end of the expansion member, and one dividing groove that divides the expansion member in the axial direction. The plurality of engaging protrusions are provided on the tapered surface of the tapered part, and the plurality of engaging protrusions enter into and engage with each of the slit groove and the dividing groove in response to the drawing of the tapered part into the expanding member. , the diameter of the circumscribed circle circumscribing the outermost radial end of the expansion member in the non-expanded state is set to be equal to or larger than the maximum outer diameter of the tapered portion and approximately the same as the diameter of the drilled hole in the concrete frame on which the anchor is to be installed. It is characterized by being
According to this, by forming the expanding member to have a substantially C-shape in cross section, fitting and attaching the expanding member to the reduced diameter portion can be facilitated. The expansion member is highly economical because it can be processed by cutting a plate material into a predetermined shape and fitting it onto the reduced diameter portion of the tapered bolt using a press machine. In addition, by engaging the engagement protrusion with the dividing groove whose groove width is highly variable, the engagement protrusion can be more reliably engaged with the groove in response to the drawing of the tapered part into the expansion member. The reliability of proper expansion of the expansion member can be further increased.

本発明の締付式アンカーは、前記拡開部材に半径方向外向きに突出する外向き突起が周方向に離間して複数箇所に形成され、前記外向き突起の最外端に外接して前記外接円が規定されることを特徴とする。
これによれば、外接円を規定する拡開部材の最外端を局所的に設けられる外向き突起の最外端とすることにより、締付式アンカー或いはテーパボルトと拡開部材のコンクリート躯体の削孔内への挿入時に、拡開部材の外向き突起が過度に孔壁と干渉して無理やりコンクリートを削りながら強力に叩き込まないとならない事態を防止しつつ、拡開部材と孔壁との間の必要な摩擦抵抗を確保し、挿入作業をより適確に行うことが可能となる。 In the tightening type anchor of the present invention, outward protrusions protruding radially outward on the expansion member are formed at a plurality of locations spaced apart in the circumferential direction, and the outward protrusions are circumferentially in contact with the outermost ends of the outward protrusions. It is characterized in that a circumscribed circle is defined.
According to this, by making the outermost end of the expansion member that defines the circumscribed circle the outermost end of the locally provided outward protrusion, the tightening anchor or taper bolt and the concrete frame of the expansion member can be removed. When inserted into a hole, the outward protrusion of the expansion member interferes excessively with the hole wall, preventing the situation where the concrete has to be forcibly scraped and hammered into the hole. It becomes possible to secure the necessary frictional resistance and perform the insertion work more accurately.

本発明の締付式アンカーの施工方法は、本発明の締付式アンカーを施工する方法であって、前記外接円の径と略同一の径でアンカー設置対象のコンクリート躯体に削孔を形成する第１工程と、前記縮径部に前記拡開部材が外嵌された前記テーパボルトを前記テーパ部を先端にして前記削孔に挿入し、前記テーパ部が孔奥近傍に配置されるまで前記テーパボルトを打ち込む第２工程と、前記テーパボルトの前記雄ねじ部に螺合された前記緩み止めナットをさらに回転させ、前記テーパ部を前記拡開部材内に引き込み且つ前記係合突起を前記溝部に入り込ませて前記拡開羽根を拡開させる第３工程を備えることを特徴とする。
これによれば、テーパボルトの打ち込みにより、拡開部材の半径方向の最外端に外接する外接円の径がコンクリート躯体の削孔径と略同一に設定されている拡開部材が外嵌されたテーパボルトを削孔内の所望位置に確実に配置することができる。更に、本発明の締付式アンカーと同様の作用効果を発揮することができる。 A method for constructing a tightening type anchor according to the present invention is a method for constructing a tightening type anchor according to the present invention, which comprises forming a hole in a concrete frame on which the anchor is to be installed, with a diameter that is substantially the same as the diameter of the circumscribed circle. a first step, inserting the tapered bolt with the expanding member externally fitted onto the reduced diameter portion into the drilled hole with the tapered portion at the tip; and inserting the tapered bolt into the drilled hole until the tapered portion is located near the back of the hole. further rotating the locking nut screwed onto the male threaded portion of the tapered bolt to draw the tapered portion into the expansion member and insert the engaging protrusion into the groove. The method is characterized by comprising a third step of expanding the expansion blade.
According to this, by driving the taper bolt, the diameter of the circumscribed circle circumscribing the outermost end in the radial direction of the expansion member is set to be approximately the same as the diameter of the drilled hole in the concrete frame. can be reliably placed at the desired position within the drilled hole. Furthermore, the same effects as the tightening type anchor of the present invention can be exhibited.

本発明によれば、緩み止めナットを適用しても適正に拡開部材を拡開してコンクリート躯体に確実に定着することができると共に、ナットの緩み止めを行うことができる。即ち、締付式アンカーの長所と緩み止めナットの長所を両立して発揮させることができる。 According to the present invention, even if a locking nut is applied, the expanding member can be properly expanded and fixed to the concrete frame reliably, and the nut can be prevented from loosening. In other words, the advantages of the tightening type anchor and the advantages of the locking nut can be exhibited at the same time.

（ａ）は本発明による第１実施形態の締付式アンカーの正面図、（ｂ）はその背面図、（ｃ）はその左側面図、（ｄ）は同締付式アンカーの拡開部材が外嵌されたテーパボルトの拡大右側面図、（ｅ）は同図（ａ）のＡ－Ａ矢視拡大断面図、（ｆ）は同図（ａ）のＢ－Ｂ矢視拡大断面図、（ｇ）は同図（ａ）のＣ－Ｃ矢視拡大断面図、（ｈ）は同図（ａ）のＤ－Ｄ矢視拡大断面図。(a) is a front view of the tightening type anchor according to the first embodiment of the present invention, (b) is its rear view, (c) is its left side view, and (d) is the expansion member of the tightening type anchor. (e) is an enlarged cross-sectional view taken along line AA in figure (a), (f) is an enlarged cross-sectional view taken along line BB in figure (a), (g) is an enlarged cross-sectional view taken along line CC in figure (a), and (h) is an enlarged cross-sectional view taken along line DD in figure (a). 第１実施形態の締付式アンカーの縦断面図。FIG. 2 is a vertical cross-sectional view of the tightening type anchor of the first embodiment. 第１実施形態の締付式アンカーの拡開状態の説明図。FIG. 2 is an explanatory diagram of the tightening type anchor of the first embodiment in an expanded state. （ａ）は第１実施形態の締付式アンカーにおけるテーパ部の係合突起を説明する断面説明図、（ｂ）は第１実施形態の変形例の締付式アンカーにおけるテーパ部の係合突起を説明する断面説明図。(a) is a cross-sectional explanatory diagram illustrating the engagement protrusion of the tapered part in the tightening type anchor of the first embodiment, and (b) is the engagement protrusion of the tapered part of the tightening type anchor of the modification of the first embodiment. FIG. （ａ）～（ｅ）は第１実施形態の締付式アンカーの施工手順を説明する説明図。(a) to (e) are explanatory diagrams illustrating the construction procedure of the tightening type anchor of the first embodiment. （ａ）～（ｄ）は第１実施形態の締付式アンカーの施工工程における係合突起の溝部への導入過程を説明する説明図。(a) to (d) are explanatory diagrams illustrating the process of introducing the engaging protrusion into the groove portion in the construction process of the tightening type anchor of the first embodiment. （ａ）、（ｂ）は本発明による第２実施形態の締付式アンカーの施工手順を説明する説明図、（ｃ）は第２実施形態の締付式アンカーにおける緩み止めナットの脱落防止状態を説明する説明図。(a) and (b) are explanatory diagrams explaining the construction procedure of the tightening type anchor of the second embodiment of the present invention, and (c) is the state in which the locking nut of the tightening type anchor of the second embodiment is prevented from falling off. An explanatory diagram for explaining.

〔第１実施形態の締付式アンカー〕
本発明による第１実施形態の締付式アンカー１は、図１～図３、図４（ａ）に示すように、テーパボルト２と、テーパボルト２の先端寄りに嵌合して取り付けられる拡開部材３と、テーパボルト２の所定位置に螺合された緩み止めナット４を備える。 [Tightening anchor of the first embodiment]
As shown in FIGS. 1 to 3 and 4(a), the tightening type anchor 1 according to the first embodiment of the present invention includes a tapered bolt 2 and an expansion member that is fitted and attached near the tip of the tapered bolt 2. 3, and a locking nut 4 screwed into a predetermined position of the taper bolt 2.

テーパボルト２には、軸部２１の前側に軸部２１よりも縮径された縮径部２２が段差２３を介して形成され、その前側に先端に向かって漸次拡径するテーパ部２４が形成されており、軸部２１の前側に縮径部２２、テーパ部２４が順に設けられていると共に、軸部２１の後側に雄ねじ部２５が設けられている。テーパ部２４のテーパ面２４１には、後述する拡開部材３へのテーパ部２４の引き込みに応じて溝部に入り込んで係合する係合突起２４２が設けられている。本実施形態における係合突起２４２は、テーパ部２４の最大外径より拡大しない高さ、換言すればテーパ部２４の最大外径以内の高さでテーパ面２４１に筋状に形成されていると共に、周方向に離間して複数箇所（図示例では３箇所）に設けられ、各係合突起２４２の最外端が後述する外接円Ｃ１、Ｃ２の内側に収まるように形成されている。 In the tapered bolt 2, a reduced diameter portion 22 which is smaller in diameter than the shaft portion 21 is formed on the front side of the shaft portion 21 via a step 23, and a tapered portion 24 whose diameter gradually increases toward the tip is formed on the front side of the reduced diameter portion 22. A reduced diameter portion 22 and a tapered portion 24 are provided in this order on the front side of the shaft portion 21, and a male threaded portion 25 is provided on the rear side of the shaft portion 21. The tapered surface 241 of the tapered portion 24 is provided with an engaging protrusion 242 that enters and engages with the groove in response to the drawing of the tapered portion 24 into the expanding member 3, which will be described later. The engagement protrusions 242 in this embodiment are formed in a striped shape on the tapered surface 241 at a height that does not expand beyond the maximum outer diameter of the tapered portion 24, in other words, within the maximum outer diameter of the tapered portion 24. , are provided at a plurality of locations (three locations in the illustrated example) spaced apart in the circumferential direction, and are formed so that the outermost ends of each engagement protrusion 242 fit inside circumscribed circles C1 and C2, which will be described later.

図４（ａ）の係合突起２４２は、例えば圧造加工によってテーパ面２４１を形成する為の雌金型の周方向に離間した３箇所に軸方向に延びる節状溝を形成しておき、そこにテーパボルトの鋼棒材を圧入することによって、テーパ部２４の最大外径より拡大しない高さでテーパ面２４１に形成されている。なお、係合突起２４２は、他の加工形成方法として、テーパボルト２の材料からテーパ面２４１を削り出す切削加工によって筋状に削り残して形成することも可能である。さらに係合突起２４２は、例えば図４（ｂ）のように、溶接部で構成される係合突起２４２ｗをテーパ面２４１に設けることも可能である。溶接部２４２ｗで構成される係合突起２４２ｗを設ける場合にも、係合突起２４２ｗは、テーパ部２４の最大外径より拡大しない高さでテーパ面２４１に筋状に形成されると共に、周方向に離間して３箇所等の複数箇所に設けられ、本実施例においては、各係合突起２４２ｗの最外端が外接円Ｃ１、Ｃ２の内側に収まるように形成される。 The engagement protrusion 242 in FIG. 4(a) is formed by forming knot-shaped grooves extending in the axial direction at three locations spaced apart in the circumferential direction of a female mold for forming the tapered surface 241 by, for example, forging. The tapered surface 241 is formed at a height that does not exceed the maximum outer diameter of the tapered portion 24 by press-fitting the steel bar material of the tapered bolt into the tapered portion 24 . In addition, the engagement protrusion 242 can also be formed by cutting the tapered surface 241 from the material of the taper bolt 2 by leaving it in a striped shape as another method of forming the engagement protrusion 242. Further, the engagement protrusion 242 may be provided with an engagement protrusion 242w formed of a welded portion on the tapered surface 241, for example as shown in FIG. 4(b). Even in the case where the engagement protrusion 242w constituted by the welded portion 242w is provided, the engagement protrusion 242w is formed in a stripe shape on the tapered surface 241 at a height that does not expand beyond the maximum outer diameter of the tapered portion 24, and is formed in a stripe shape in the circumferential direction. In this embodiment, the outermost ends of each engaging protrusion 242w are formed to fit inside the circumscribed circles C1 and C2.

拡開部材３は、テーパボルト２の縮径部２２に外嵌され、非拡開状態では段差２３とテーパ面２４１の内端近傍との間で定置されている。拡開部材３には、テーパ部２４の引き込みに応じて拡開する拡開羽根３１が溝部で区分して形成されている。本実施形態の拡開部材３は断面視略Ｃ字形で形成され、拡開部材３の前端から軸方向に切り込まれたスリット溝３２と、拡開部材３を軸方向に分断する分断溝３３が設けられており、スリット溝３２と分断溝３３で溝部が構成されている。分断溝３３のテーパ部２４寄りの前部分は後部分よりも幅広の溝で形成され、後述する係合突起２４２の分断溝３３への入り込み易さが高められており、更に、本例では係合突起２４２の分断溝３３への入り込み易さの向上に応じて、係合突起２４２のスリット溝３２への入り込み易さも高められている。 The expanding member 3 is externally fitted onto the reduced diameter portion 22 of the tapered bolt 2, and is positioned between the step 23 and the vicinity of the inner end of the tapered surface 241 in the non-expanded state. The expansion member 3 is formed with expansion blades 31 which are divided by grooves and which expand according to the retraction of the tapered portion 24 . The expansion member 3 of this embodiment is formed in a substantially C-shape in cross section, and includes a slit groove 32 cut in the axial direction from the front end of the expansion member 3, and a dividing groove 33 that divides the expansion member 3 in the axial direction. The slit groove 32 and the dividing groove 33 constitute a groove portion. The front part of the dividing groove 33 near the tapered part 24 is formed with a wider groove than the rear part, making it easier for the engaging protrusion 242 to enter the dividing groove 33, which will be described later. In accordance with the improvement in the ease with which the mating protrusion 242 enters the dividing groove 33, the ease with which the engagement protrusion 242 enters into the slit groove 32 is also increased.

拡開部材３には、半径方向外向きに突出する外向き突起３４、３５が周方向に離間して複数箇所に形成されている。本実施形態では、拡開羽根３１の略中央位置で半径方向外向きに突出し、周方向に離間して複数箇所（図示例では３箇所）されている前側の外向き突起３４と、拡開部材３の後端近傍の位置で半径方向外向きに突出し、周方向に離間して複数箇所（図示例では３箇所）されている後側の外向き突起３５が設けられ、前側の外向き突起３４と後側の外向き突起３５は軸方向で対応する位置に配置されている。図示例の拡開部材３は、所定形状にカットしたプレート材に、外向き突起３４、３５をプレス成型してから、テーパボルト２の縮径部２２に丸め付けるように外装するよう加工される為、外向き突起３４、３５の位置や形状は、図示したものに限られない。 The expansion member 3 has a plurality of outward protrusions 34 and 35 that protrude outward in the radial direction and are spaced apart in the circumferential direction. In this embodiment, a front outward protrusion 34 protrudes radially outward at a substantially central position of the expansion blade 31 and is provided at a plurality of locations (three locations in the illustrated example) spaced apart in the circumferential direction, and an expansion member A rear outward protrusion 35 protrudes radially outward at a position near the rear end of 3, and is provided at a plurality of locations (three locations in the illustrated example) spaced apart in the circumferential direction, and a front outward protrusion 34 and the rear outward protrusion 35 are arranged at corresponding positions in the axial direction. The expansion member 3 in the illustrated example is formed by press-molding outward protrusions 34 and 35 on a plate material cut into a predetermined shape, and then wrapping it around the reduced diameter portion 22 of the taper bolt 2. The positions and shapes of the outward protrusions 34 and 35 are not limited to those shown.

拡開部材３では、非拡開状態の拡開部材３の半径方向の最外端に外接する外接円の径が、テーパボルト２のテーパ部２４の最大外径以上で且つアンカー設置対象のコンクリート躯体１０の削孔１１の削孔径と略同一に設定されている（図５参照）。本実施形態では、前側の外向き突起３４の最外端に外接して外接円Ｃ１が規定され、又、後側の外向き突起３５の最外端に外接して外接円Ｃ２が規定されており、外接円Ｃ１と外接円Ｃ２は中心軸を同じくし且つ同一の半径を有しており（図１（ｄ）、（ｅ）、（ｇ）参照）、外接円Ｃ１の径と外接円Ｃ２の径の双方とも、テーパボルト２のテーパ部２４の最大外径以上で且つアンカー設置対象のコンクリート躯体１０の削孔１１の削孔径と略同一に設定されている、即ち、非拡開状態の拡開部材３では、半径方向外向きに突出した前側の外向き突起３４の拡開部材３の中心軸からの高さと、半径方向外向きに突出した後側の外向き突起３５の拡開部材３の中心軸からの高さは同一高さになっている。 In the expansion member 3, the diameter of the circumscribed circle circumscribing the radially outermost end of the expansion member 3 in the non-expanded state is equal to or larger than the maximum outer diameter of the tapered portion 24 of the taper bolt 2, and the concrete frame on which the anchor is to be installed is The hole diameter is set to be approximately the same as the hole diameter of the hole 11 in No. 10 (see FIG. 5). In this embodiment, a circumscribed circle C1 is defined circumscribing the outermost end of the outward protrusion 34 on the front side, and a circumscribing circle C2 is defined circumscribing the outermost end of the outward protrusion 35 on the rear side. Therefore, the circumscribed circle C1 and the circumscribed circle C2 have the same central axis and the same radius (see FIGS. 1(d), (e), and (g)), and the diameter of the circumscribed circle C1 and the circumscribed circle C2 Both diameters are set to be greater than or equal to the maximum outer diameter of the tapered portion 24 of the tapered bolt 2 and approximately the same as the diameter of the drilled hole 11 in the concrete frame 10 on which the anchor is installed, that is, the diameter of the expanded hole in the non-expanded state. In the opening member 3, the height of the front outward projection 34 projecting radially outward from the central axis of the expansion member 3, and the height of the rear outward projection 35 projecting radially outward of the expansion member 3. The heights from the central axis are the same.

緩み止めナット４には、雌ねじ部４１の頂部近傍で内方に突出するように一対のフリクション片４２、４２が内装されており、それぞれのフリクション片４２は１／４円環形状をなす板バネからなる。緩み止めナット４は、雌ねじ部４１がテーパボルト２の雄ねじ部２５に螺合された際に、フリクション片４２、４２が雄ねじ部２５への係合で弾性変形してねじ山に噛み付き、緩み止め機能を発揮するようになっている。緩み止めナット４は、その特性上、手指の力だけではテーパボルト２の雄ねじ部２５にねじ込むことは出来ない為、予め工場で雄ねじ部２５の所定位置にワッシャー５と共に螺合されている。従って、締付式アンカー１の搬送中や施工におけるアンカー挿入作業時に緩み止めナット４が分離してしまうことがない。 A pair of friction pieces 42, 42 is installed inside the locking nut 4 so as to protrude inward near the top of the female threaded portion 41, and each friction piece 42 is a plate spring having a quarter annular shape. Consisting of In the locking nut 4, when the female threaded portion 41 is screwed onto the male threaded portion 25 of the tapered bolt 2, the friction pieces 42, 42 are elastically deformed by engagement with the male threaded portion 25 and bite the thread, thereby achieving a locking function. It is designed to demonstrate. Due to its characteristics, the locking nut 4 cannot be screwed into the male threaded portion 25 of the tapered bolt 2 with just the force of fingers, so it is screwed together with the washer 5 into a predetermined position of the male threaded portion 25 at the factory in advance. Therefore, the locking nut 4 will not separate during transport of the tightening anchor 1 or during anchor insertion work during construction.

締付式アンカー１では、雄ねじ部２５の所定位置に予め螺合された緩み止めナット４を手動又は電動の締付具１４によりさらに回転させると、テーパボルト２の各係合突起２４２が削孔１１内で定置された拡開部材３のスリット溝３２と分断溝３３にそれぞれ入り込み、緩み止めナット４とテーパボルト２の供回りが防止された状態でテーパボルト２のテーパ部２４が拡開部材３に引き込まれ、拡開羽根３１を拡開させる。拡開された拡開羽根３１及び前側の外向き突起３４はコンクリート躯体１０の削孔１１の孔壁に食い込み、高強度の楔機能を発揮する（図３、図５、図６参照）。 In the tightening anchor 1, when the locking nut 4, which is screwed in advance into a predetermined position of the male threaded portion 25, is further rotated by the manual or electric fastener 14, each engagement protrusion 242 of the tapered bolt 2 engages with the drilled hole 11. The tapered portion 24 of the tapered bolt 2 is pulled into the expanding member 3 in a state where the locking nut 4 and the tapered bolt 2 are prevented from rotating together. Then, the expansion blades 31 are expanded. The expanded expansion blade 31 and the front outward protrusion 34 bite into the hole wall of the drilled hole 11 of the concrete body 10, and exhibit a high-strength wedge function (see FIGS. 3, 5, and 6).

第１実施形態の締付式アンカー１を施工する際には、図５（ａ）に示すように、前側の外向き突起３４の最外端に外接して規定される外接円Ｃ１の径、又は後側の外向き突起３５の最外端に外接して規定される外接円Ｃ２の径と略同一の径でアンカー設置対象のコンクリート躯体１０に削孔１１を形成する。そして、取付物１２の取付穴を削孔１１に位置決めした状態で、予め緩み止めナット４が螺合された締付式アンカー１を、テーパ部２４を先端にして削孔１１にハンマー１３で打ち込む（図５（ｂ）、図６（ａ）参照）。テーパボルト２の打込み時には、拡開部材３の外向き突起３４、３５は削孔１１の孔壁の摩擦抵抗に抗して孔奥側に移動する。 When constructing the tightening type anchor 1 of the first embodiment, as shown in FIG. Alternatively, a hole 11 is formed in the concrete frame 10 on which the anchor is to be installed, with a diameter substantially the same as the diameter of a circumscribed circle C2 defined by circumscribing the outermost end of the outward projection 35 on the rear side. Then, with the mounting hole of the attachment 12 positioned in the drilled hole 11, the tightening anchor 1, onto which the locking nut 4 has been screwed in advance, is driven into the drilled hole 11 with the tapered portion 24 at the tip using the hammer 13. (See FIGS. 5(b) and 6(a)). When driving the taper bolt 2, the outward protrusions 34 and 35 of the expanding member 3 move toward the back of the hole against the frictional resistance of the hole wall of the drilled hole 11.

その後、図５（ｃ）、（ｄ）、図６（ｂ）、（ｃ）の太線矢印のように、テーパボルト２の雄ねじ部２５の所定位置に螺合された緩み止めナット４を手動又は電動の締付具１４でさらに回転させていくと、ナット締めの当初はテーパボルト２が僅かに供回りしながら拡開部材３に引き込まれていくが、すぐに係合突起２４２が分断溝３３、スリット溝３２に入り込んで係合する。そして、拡開部材３の拡開羽根３１が拡開して拡開された拡開羽根３１及び前側の外向き突起３４がコンクリート躯体１０の削孔１１の孔壁に食い込んで拡開部材３が高強度で回転不能に定置されると共に、係合突起２４２のス分断溝３３、スリット溝３２への係合で緩み止めナット４との供回りが防止されたテーパボルト２のテーパ部２４が緩み止めナット４の螺入分だけ拡開部材３に引き込まれ（図６（ｄ）の太線矢印参照）、拡開羽根３１の拡開が進行して拡開された拡開羽根３１及び前側の外向き突起３４が一層削孔１１の孔壁に食い込む。 5(c), (d), FIG. 6(b), and (c), manually or electrically tighten the locking nut 4 screwed into the predetermined position of the male threaded portion 25 of the taper bolt 2. When the tightening tool 14 is further rotated, the taper bolt 2 is pulled into the expanding member 3 while rotating slightly at the beginning of the nut tightening, but soon the engaging protrusion 242 is inserted into the dividing groove 33 and the slit. It enters into the groove 32 and engages. Then, the expansion blades 31 of the expansion member 3 are expanded, and the expanded expansion blades 31 and the outward protrusion 34 on the front side bite into the hole wall of the drilled hole 11 of the concrete frame 10, and the expansion member 3 is expanded. The tapered part 24 of the tapered bolt 2 is fixed with high strength and cannot be rotated, and is prevented from rotating with the locking nut 4 by the engagement of the engagement protrusion 242 with the slit groove 33 and slit groove 32. The expansion member 3 is pulled into the expansion member 3 by the screwed-in amount of the nut 4 (see the thick arrow in FIG. 6(d)), and the expansion blade 31 continues to expand, and the expansion blade 31 and the front outward direction are expanded. The protrusion 34 bites further into the hole wall of the drilled hole 11.

規程のトルク値になるまで締付具１４で緩み止めナット４を締め付けると、拡開部材３の拡開羽根３１が完全拡開となり、完全拡開の拡開羽根３１及びその拡開羽根３１の外面で外向きに突出する前側の外向き突起３４が削孔１１の孔壁に食い込んで、締付式アンカー１の施工、コンクリート躯体１０への設置が完了する（図５（ｅ）、図６（ｄ）参照）。 When the locking nut 4 is tightened with the tightening tool 14 until the prescribed torque value is reached, the expansion blade 31 of the expansion member 3 will be fully expanded, and the expansion blade 31 and its expansion blade 31 will be completely expanded. The front outward protrusion 34 that protrudes outward on the outer surface bites into the hole wall of the drilled hole 11, and the construction of the tightening type anchor 1 and the installation in the concrete frame 10 are completed (FIGS. 5(e) and 6). (see (d)).

第１実施形態によれば、拡開部材３へのテーパ部２４の引き込みに応じて係合突起２４２が溝部に係合し、この係合で緩み止めナット４とテーパボルト２の供回りが防止された状態で、締付式アンカー１の拡開羽根３１の拡開が適正に行なわれる。従って、緩み止めナット４を適用しても適正に拡開部材３を拡開して締付式アンカー１をコンクリート躯体１０に確実に定着することができる。また、拡開部材３の適正な拡開を妨げずに緩み止めナット４を適用することが可能であることから、ナットの緩み止めを行うことができる。 According to the first embodiment, the engaging protrusion 242 engages with the groove in response to the drawing of the tapered part 24 into the expanding member 3, and this engagement prevents the locking nut 4 and the tapered bolt 2 from rotating together. In this state, the expansion blades 31 of the tightening anchor 1 are properly expanded. Therefore, even if the locking nut 4 is applied, the expansion member 3 can be properly expanded to securely fix the tightening type anchor 1 to the concrete frame 10. Furthermore, since the locking nut 4 can be applied without interfering with proper expansion of the expanding member 3, the nut can be prevented from loosening.

また、拡開部材３の半径方向の最外端に外接する外接円Ｃ１、Ｃ２の径をコンクリート躯体１０の削孔径と略同一に設定することにより、締付式アンカー１をコンクリート躯体１０の削孔１１内に挿入した時点で拡開部材３の半径方向の最外端と孔壁との摩擦力を高め、拡開部材３がテーパボルト２と供回りしてしまうことを防ぎ、テーパ部２４の拡開部材３への引き込みの当初から拡開部材３を削孔１１に対して配置固定した状態で、拡開羽根３１の拡開動作を行うことができる。また、拡開部材３の半径方向の最外端に外接する外接円Ｃ１、Ｃ２の径をテーパボルト２のテーパ部２４の最大外径以上とすることにより、上記の拡開部材３の供回りを防止すると同時に、締付式アンカー１或いはテーパボルト２と拡開部材３の削孔１１内への挿入をテーパ部２４が妨げることを無くし、挿入作業を確実且つスムーズに行うことが可能となる。 Furthermore, by setting the diameters of the circumscribed circles C1 and C2 that circumscribe the outermost radial end of the expansion member 3 to be approximately the same as the diameter of the hole drilled in the concrete body 10, the tightening anchor 1 can be attached to the hole drilled in the concrete body 10. When inserted into the hole 11, the frictional force between the outermost radial end of the expansion member 3 and the hole wall is increased, preventing the expansion member 3 from rotating together with the taper bolt 2, and preventing the expansion member 3 from rotating with the taper bolt 2. The expansion operation of the expansion blades 31 can be performed with the expansion member 3 positioned and fixed in the drilled hole 11 from the beginning of the drawing into the expansion member 3. Furthermore, by making the diameters of the circumscribed circles C1 and C2 that circumscribe the outermost radial end of the expanding member 3 equal to or larger than the maximum outer diameter of the tapered portion 24 of the tapered bolt 2, the co-rotation of the expanding member 3 can be prevented. At the same time, it is possible to prevent the tapered portion 24 from interfering with the insertion of the tightening anchor 1 or the tapered bolt 2 and the expansion member 3 into the drilled hole 11, making it possible to perform the insertion work reliably and smoothly.

また、係合突起２４２を、テーパ部２４の最大外径より拡大しない高さでテーパ面２４１に筋状に形成する場合には、コンクリート躯体１０の削孔１１へのテーパボルト２挿入時に係合突起２４２が孔壁と干渉することがなく、締付式アンカー１の施工における作業性に優れる。また、節状に形成された係合突起２４２は拡開部材３へのテーパ部２４の引き込みに応じて円滑に溝部に入り込むことができる。 In addition, when the engagement protrusion 242 is formed in a striped manner on the tapered surface 241 at a height that does not expand beyond the maximum outer diameter of the tapered portion 24, the engagement protrusion 242 may be inserted into the taper bolt 2 into the drilled hole 11 of the concrete frame 10. 242 does not interfere with the hole wall, and the workability in constructing the tightening type anchor 1 is excellent. In addition, the knot-shaped engagement protrusion 242 can smoothly enter the groove portion as the tapered portion 24 is drawn into the expansion member 3.

また、拡開部材３を断面視略Ｃ字形で形成することにより、拡開部材３の縮径部２２への外嵌め、取付作業を容易化することができる。拡開部材３は、所定形状にカットしたプレート材をプレス加工機でテーパボルト２の縮径部２２に外嵌する加工が可能となる為、経済性に優れる。また、溝幅の可変性が高い分断溝３３に係合突起２４２を係合することにより、拡開部材３へのテーパ部２４の引き込みに応じて係合突起２４２をより確実に溝部に係合することができ、拡開部材３の適正拡開の確実性を一層高めることができる。 Further, by forming the expanding member 3 to have a substantially C-shape in cross section, fitting and attaching the expanding member 3 to the reduced diameter portion 22 can be facilitated. The expanding member 3 can be manufactured by cutting a plate material into a predetermined shape and fitting it onto the reduced diameter portion 22 of the tapered bolt 2 using a press machine, so that it is highly economical. In addition, by engaging the engagement protrusion 242 with the dividing groove 33 whose groove width is highly variable, the engagement protrusion 242 is more reliably engaged with the groove in response to the drawing of the tapered part 24 into the expanding member 3. This makes it possible to further increase the reliability of proper expansion of the expansion member 3.

また、外接円Ｃ１、Ｃ２を規定する拡開部材３の最外端を局所的に設けられる外向き突起３４、３５の最外端とすることにより、締付式アンカー１或いはテーパボルト２と拡開部材３のコンクリート躯体１０の削孔１１内への挿入時に、拡開部材３の外向き突起３４、３５が過度に孔壁と干渉して無理やりコンクリートを削りながら叩き込まないとならない事態を防止しつつ、拡開部材３と孔壁との間の必要な摩擦抵抗を確保し、挿入作業をより適確に行うことが可能となる。 Furthermore, by making the outermost ends of the expanding member 3 that define the circumscribed circles C1 and C2 the outermost ends of the locally provided outward protrusions 34 and 35, the tightening anchor 1 or the tapered bolt 2 can be expanded. When inserting the member 3 into the drilled hole 11 of the concrete frame 10, the outward protrusions 34 and 35 of the expanding member 3 interfere excessively with the hole wall, thereby preventing the situation where the concrete has to be forcibly scraped while being hammered into the hole. , it is possible to ensure the necessary frictional resistance between the expanding member 3 and the hole wall, and to perform the insertion operation more accurately.

また、テーパボルト２を打ち込んで拡開部材３が外嵌されたテーパボルト２を削孔１１の孔奥近傍に配置することにより、拡開部材３の半径方向の最外端に外接する外接円Ｃ１、Ｃ２の径がコンクリート躯体１０の削孔１１の削孔径と略同一に設定されている拡開部材３が外嵌されたテーパボルト２を、削孔１１内の所望位置に確実に配置することができる。 Further, by driving the taper bolt 2 and placing the tapered bolt 2 with the expansion member 3 fitted thereon near the back of the drilled hole 11, a circumscribed circle C1 circumscribing the outermost end of the expansion member 3 in the radial direction, The taper bolt 2 fitted with the expansion member 3 whose diameter C2 is set to be substantially the same as the diameter of the drilled hole 11 of the concrete frame 10 can be reliably placed at a desired position within the drilled hole 11. .

〔第２実施形態の締付式アンカー〕
本発明による第２実施形態の締付式アンカー１ａには、図７に示すように、テーパボルト２ａの雄ねじ部２５ａの後端寄りの途中位置に雄ねじ部２５ａのねじ山より小径でねじ溝が形成されていない略円柱状の段落とし部２６ａが形成されている。テーパボルト２ａのその他の構成は第１実施形態におけるテーパボルト２と同一である。また、第２実施形態の締付式アンカー１ａは、第１実施形態の締付式アンカー１と同一構成の拡開部材３、緩み止めナット４を有し、第１実施形態と同一構成のワッシャー５が用いられる。 [Tightening anchor of second embodiment]
As shown in FIG. 7, in the tightening anchor 1a of the second embodiment of the present invention, a thread groove is formed at a position halfway toward the rear end of the male threaded portion 25a of the tapered bolt 2a with a diameter smaller than the thread of the male threaded portion 25a. A substantially cylindrical stepped portion 26a is formed. The other configuration of the taper bolt 2a is the same as the taper bolt 2 in the first embodiment. Further, the tightening type anchor 1a of the second embodiment has an expanding member 3 and a locking nut 4 having the same configuration as the tightening type anchor 1 of the first embodiment, and a washer having the same configuration as the first embodiment. 5 is used.

第２実施形態の締付式アンカー１ａは、第１実施形態の締付式アンカー１と基本的に同一の施工手順でコンクリート躯体１０に設置され、取付物１２が取り付けられる。即ち、締付式アンカー１ａを削孔１１に挿入後、予め工場で段落とし部２６ａより前方の雄ねじ部２５ａに螺合されている緩み止めナット４を、手動又は電動の締付具１４でさらに回転させ、テーパ部２４を拡開部材３に引き込み、更に、テーパボルト２ａの係合突起２４２を分断溝３３、スリット溝３２に入り込ませて係合した状態でテーパ部２４の拡開部材３への引き込みを継続し（図７（ｂ）の太線矢印参照）、拡開部材３の拡開羽根３１を拡開させ、適正拡開した拡開羽根３１及び前側の外向き突起３４を削孔１１の孔壁に食い込ませるようにして施工する。 The tightening type anchor 1a of the second embodiment is installed on the concrete frame 10 and the attachment 12 is attached using basically the same construction procedure as the tightening type anchor 1 of the first embodiment. That is, after inserting the tightening anchor 1a into the drilled hole 11, the locking nut 4, which has been previously screwed onto the male threaded portion 25a in front of the stepped portion 26a at the factory, is further tightened using a manual or electric tightening tool 14. Rotate the tapered portion 24 to draw it into the expansion member 3, and then insert the engagement protrusion 242 of the taper bolt 2a into the dividing groove 33 and the slit groove 32 to engage with it. Continuing the retraction (see thick arrow in FIG. 7(b)), expand the expansion blades 31 of the expansion member 3, and insert the properly expanded expansion blades 31 and the outward protrusion 34 on the front side into the drilled hole 11. Work by digging into the hole wall.

そして、第２実施形態では、万一、予見し難いような交通振動によって雄ねじ部２５ａに螺入した緩み止めナット４に緩みが発生した場合、緩み止めナット４が段落とし部２６ａに落ち込み、雄ねじ部２５ａから外れて落下することが防止される。従って、緩み止めナット４で螺着されていたワッシャー５、取付物１２も、段落とし部２６ａに落下した緩み止めナット４よりも外側に移動することが妨げられ、ワッシャー５、取付物１２の脱落も防止される。 In the second embodiment, in the unlikely event that the locking nut 4 screwed into the male threaded portion 25a becomes loose due to traffic vibration that is difficult to predict, the locking nut 4 falls into the stepped portion 26a, and the male thread This prevents it from coming off the part 25a and falling. Therefore, the washer 5 and the attachment 12, which were screwed with the locking nut 4, are also prevented from moving outward from the locking nut 4 that has fallen into the stepped part 26a, and the washer 5 and the attachment 12 fall off. is also prevented.

〔本明細書開示発明の包含範囲〕
本明細書開示の発明は、発明として列記した各発明、各実施形態の他に、適用可能な範囲で、これらの部分的な内容を本明細書開示の他の内容に変更して特定したもの、或いはこれらの内容に本明細書開示の他の内容を付加して特定したもの、或いはこれらの部分的な内容を部分的な作用効果が得られる限度で削除して上位概念化して特定したものを包含する。そして、本明細書開示の発明には下記内容や変形例も含まれる。 [Scope of inclusion of the invention disclosed herein]
In addition to each invention and each embodiment listed as an invention, the invention disclosed in this specification is specified by changing the partial contents of these to other contents disclosed in this specification to the extent applicable. , or specified by adding other contents disclosed in this specification to these contents, or specified by deleting these partial contents to the extent that partial effects can be obtained and converting them into a general concept. includes. The invention disclosed in this specification also includes the following contents and modifications.

例えば第１実施形態の締付式アンカー１の図示例では、拡開部材３の溝部を周方向に略等間隔で離間して形成した２つのスリット溝３２と１つの分断溝３３で構成すると共に、テーパ部２４の係合突起２４２を周方向に略等間隔で離間して形成した３つの係合突起２４２を設け、緩み止めナット４のナット締めで１つの係合突起２４２が分断溝３３に入り込んで係合し、残りの２つの係合突起２４２が２つのスリット溝３２に入り込んで係合し、各々の溝部の全てに対応して係合突起２４２が係合する構成としたが、拡開部材３の全ての溝部のうち一部の溝部だけにテーパ部の係合突起を入り込ませてテーパボルトの供回りを防止する構成とすることも可能である。この場合、例えばスリット溝３２に比べて分断溝３３は幅が拡がる変形がし易く、またテーパボルト２に拡開部材３を組み付ける加工工程において、所定形状にカットした拡開部材用のプレート材をプレス機械によってテーパボルト２の縮径部２２に丸め付けるように加工する場合には分断溝３３は省略されることなく必然的に形成されるものであるところから、少なくとも分断溝３３に係合突起を入り込ませて係合する構成とすると良好である。 For example, in the illustrated example of the tightening type anchor 1 of the first embodiment, the groove portion of the expansion member 3 is composed of two slit grooves 32 and one dividing groove 33, which are formed at approximately equal intervals in the circumferential direction. , three engagement protrusions 242 are provided, which are formed by spacing the engagement protrusions 242 of the tapered portion 24 at approximately equal intervals in the circumferential direction, and when the locking nut 4 is tightened, one engagement protrusion 242 is inserted into the dividing groove 33. The remaining two engaging protrusions 242 enter and engage with the two slit grooves 32, and the engaging protrusions 242 engage with all of the respective grooves. It is also possible to have a configuration in which the engaging protrusion of the tapered portion is inserted into only some of all the grooves of the opening member 3 to prevent the tapered bolt from rotating together. In this case, for example, the dividing groove 33 is more easily deformed to expand in width than the slit groove 32, and in the process of assembling the expanding member 3 to the taper bolt 2, a plate material for the expanding member cut into a predetermined shape is pressed. When the reduced diameter portion 22 of the tapered bolt 2 is rounded by a machine, the dividing groove 33 is inevitably formed without being omitted. It is preferable to adopt a structure in which the two parts are engaged together.

また、本発明における拡開部材は、拡開部材３のように断面視略Ｃ字形状にするとテーパボルト２への外嵌がし易くなって好適であるが、テーパボルト２の縮径部２２に押圧外挿して外嵌可能であれば筒状とすることも可能であり、この場合には拡開部材の溝部を構成するスリット溝にテーパ部２４の係合突起２４２等が入り込んで係合される。 Further, it is preferable that the expansion member in the present invention has a substantially C-shaped cross section like the expansion member 3 because it can be easily fitted onto the tapered bolt 2. If it can be fitted externally, it can be made into a cylindrical shape, and in this case, the engaging protrusion 242 of the tapered part 24 enters and is engaged with the slit groove that constitutes the groove of the expanding member. .

また、第１、第２実施形態では、外接円を規定する非拡開状態の拡開部材３の半径方向の最外端を周方向に複数配置される前型の外向き突起３４と、周方向に複数配置される後側の外向き突起３５の２組とし、これに対応して２つの外接円Ｃ１、Ｃ２を規定したが、外接円を規定する非拡開状態の拡開部材３の半径方向の最外端を周方向に複数配置される前側の外向き突起３４と、周方向に複数配置される後側の外向き突起３５のいずれか一組とし、これに対応して１つの外接円を規定し、この１つの外接円の径を、テーパ部２４の最大外径以上で且つコンクリート躯体１０の削孔１１の削孔径と略同一に設定する構成とすることも可能である。この場合、非拡開状態の拡開部材３の半径方向の最外端を周方向に複数配置される前側の外向き突起３４とし、これに対応して１つの外接円Ｃ１だけを規定する構成とすると、拡開部材３の拡開時に外向き突起３４でより高強度の楔機能を得られるため好適である。 Further, in the first and second embodiments, the outermost radial end of the expansion member 3 in the non-expanded state that defines the circumscribed circle is connected to a plurality of outward protrusions 34 of the front mold disposed in the circumferential direction, and Two sets of outward protrusions 35 on the rear side are arranged in multiple directions, and two circumscribed circles C1 and C2 are defined correspondingly. The outermost end in the radial direction is set as either one of a plurality of front outward protrusions 34 arranged in the circumferential direction and a plurality of rear outward protrusions 35 arranged in the circumferential direction. It is also possible to define a circumscribed circle and set the diameter of this one circumscribed circle to be equal to or larger than the maximum outer diameter of the tapered portion 24 and approximately the same as the diameter of the drilled hole 11 of the concrete frame 10. In this case, the outermost radial end of the expansion member 3 in the non-expanded state is a plurality of front outward projections 34 arranged in the circumferential direction, and correspondingly, only one circumscribed circle C1 is defined. This is preferable because the outward protrusion 34 can provide a wedge function with higher strength when the expanding member 3 is expanded.

本発明は、ナット締めでテーパボルトのテーパ部を拡開部材に引き込んで拡開羽根を拡開させる締付式アンカーに利用することができる。 INDUSTRIAL APPLICATION This invention can be utilized for the tightening type anchor which pulls the taper part of a taper bolt into an expansion member, and expands an expansion blade by tightening a nut.

１、１ａ…締付式アンカー ２、２ａ…テーパボルト ２１…軸部 ２２…縮径部 ２３…段差 ２４…テーパ部 ２４１…テーパ面 ２４２、２４２ｗ…係合突起 ２５、２５ａ…雄ねじ部 ２６ａ…段落とし部 ３…拡開部材 ３１…拡開羽根 ３２…スリット溝 ３３…分断溝 ３４…前側の外向き突起 ３５…後側の外向き突起 ４…緩み止めナット ４１…雌ねじ部 ４２…フリクション片 ５…ワッシャー １０…コンクリート躯体 １１…削孔 １２…取付物 １３…ハンマー １４…締付具 Ｃ１、Ｃ２…外接円
 1, 1a...Tightening type anchor 2, 2a...Taper bolt 21...Shaft part 22...Reduced diameter part 23...Step 24...Tapered part 241...Tapered surface 242, 242w...Engaging protrusion 25, 25a...Male thread part 26a...Rag Part 3... Expanding member 31... Expanding blade 32... Slit groove 33... Parting groove 34... Outward protrusion on the front side 35... Outward protrusion on the rear side 4... Locking nut 41... Female threaded part 42... Friction piece 5... Washer 10...Concrete frame 11...Drilling hole 12...Attachment 13...Hammer 14...Tightening tool C1, C2...Circumcircle

Claims (4)

軸部の前側に縮径部とテーパ部が順に設けられ、前記軸部の後側に雄ねじ部が設けられているテーパボルトと、
前記テーパ部の引き込みに応じて拡開する拡開羽根が複数の溝部で区分して形成され、非拡開状態において、前記溝部に入り込んで係合する係合突起が設けられていない前記縮径部に外嵌され且つ前記係合突起に係合されていない断面視略Ｃ字形の拡開部材と、
前記雄ねじ部に螺合され、前記雄ねじ部への係合で弾性変形するフリクション片が設けられている緩み止めナットを備える締付式アンカーであって、
複数の前記溝部が、前記拡開部材の前端から軸方向に切り込まれたスリット溝と、前記拡開部材を軸方向に分断する１つの分断溝とで構成され、
前記テーパ部のテーパ面に、前記拡開部材への前記テーパ部の引き込みに応じて、前記スリット溝と前記分断溝のそれぞれに入り込んで係合する複数の前記係合突起が設けられ、
非拡開状態の前記拡開部材の半径方向の最外端に外接する外接円の径が、前記テーパ部の最大外径以上で且つアンカー設置対象のコンクリート躯体の削孔径と略同一に設定されていることを特徴とする締付式アンカー。 A tapered bolt, in which a reduced diameter portion and a tapered portion are sequentially provided on the front side of the shaft portion, and a male threaded portion is provided on the rear side of the shaft portion;
The reduced diameter expansion blade is formed by being divided into a plurality of grooves and expands in response to retraction of the tapered portion, and is not provided with an engaging protrusion that enters and engages with the groove in a non-expanded state. an expanding member having a substantially C-shape in cross section and not being engaged with the engaging protrusion;
A tightening type anchor comprising a locking nut screwed onto the male threaded portion and provided with a friction piece that elastically deforms when engaged with the male threaded portion,
The plurality of groove portions are composed of slit grooves cut in the axial direction from the front end of the expansion member, and one dividing groove that divides the expansion member in the axial direction,
A plurality of the engagement protrusions are provided on the tapered surface of the tapered portion, and the plurality of engagement protrusions enter and engage each of the slit groove and the dividing groove in response to the drawing of the tapered portion into the expansion member,
The diameter of the circumscribed circle circumscribing the outermost radial end of the expansion member in the non-expanded state is set to be equal to or larger than the maximum outer diameter of the tapered portion and approximately the same as the diameter of the drilled hole in the concrete frame in which the anchor is to be installed. A tightening type anchor characterized by: 前記係合突起が、前記テーパ部の最大外径より拡大しない高さで前記テーパ面に筋状に形成されていることを特徴とする請求項１記載の締付式アンカー。 2. The tightening type anchor according to claim 1, wherein the engaging protrusion is formed in a stripe shape on the tapered surface with a height that does not increase beyond the maximum outer diameter of the tapered portion. 前記拡開部材に半径方向外向きに突出する外向き突起が周方向に離間して複数箇所に形成され、
前記外向き突起の最外端に外接して前記外接円が規定されることを特徴とする請求項１又は２記載の締付式アンカー。 outward protrusions protruding radially outward on the expansion member are formed at a plurality of locations spaced apart in the circumferential direction;
The tightening type anchor according to claim 1 or 2, wherein the circumscribed circle is defined to circumscribe the outermost end of the outward projection. 請求項１～３の何れかに記載の締付式アンカーの施工方法であって、
前記外接円の径と略同一の径でアンカー設置対象のコンクリート躯体に削孔を形成する第１工程と、
前記縮径部に前記拡開部材が外嵌された前記テーパボルトを前記テーパ部を先端にして前記削孔に挿入し、前記テーパ部が孔奥近傍に配置されるまで前記テーパボルトを打ち込む第２工程と、
前記テーパボルトの前記雄ねじ部に螺合された前記緩み止めナットをさらに回転させ、前記テーパ部を前記拡開部材内に引き込み且つ前記係合突起を前記溝部に入り込ませて前記拡開羽根を拡開させる第３工程を備えることを特徴とする締付式アンカーの施工方法。 A method for constructing a tightening type anchor according to any one of claims 1 to 3, comprising:
A first step of forming a hole in the concrete frame to which the anchor is to be installed with a diameter substantially the same as the diameter of the circumscribed circle;
A second step of inserting the tapered bolt with the expanding member externally fitted onto the reduced diameter portion into the drilled hole with the tapered portion as the tip, and driving the tapered bolt until the tapered portion is located near the back of the hole. and,
The locking nut screwed onto the male threaded portion of the tapered bolt is further rotated, the tapered portion is drawn into the expanding member, and the engaging protrusion is inserted into the groove to expand the expanding blades. A method for constructing a tightening type anchor, characterized by comprising a third step of:
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001159415A (en) 1999-12-01 2001-06-12 Kishiwada Stainless Kk Device for preventing nut from coming off
JP2008185076A (en) 2007-01-29 2008-08-14 Kfc Ltd Bolt connecting nut and anchor construction method using the same
JP2015102207A (en) 2013-11-27 2015-06-04 株式会社冨士精密 Lock nut

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4890064U (en) * 1972-02-07 1973-10-30
JPS5171478U (en) * 1974-11-30 1976-06-05
JPS51118868U (en) * 1975-03-22 1976-09-27
JPS57171411U (en) * 1981-04-24 1982-10-28
GB9210235D0 (en) * 1992-05-13 1992-07-01 Emhart Inc Anchor bolt
JPH09303347A (en) * 1996-04-19 1997-11-25 Meikin Go Expanding type bolt

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001159415A (en) 1999-12-01 2001-06-12 Kishiwada Stainless Kk Device for preventing nut from coming off
JP2008185076A (en) 2007-01-29 2008-08-14 Kfc Ltd Bolt connecting nut and anchor construction method using the same
JP2015102207A (en) 2013-11-27 2015-06-04 株式会社冨士精密 Lock nut

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