JP2021092039A - Construction method of anchor for concrete - Google Patents

Construction method of anchor for concrete Download PDF

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JP2021092039A
JP2021092039A JP2019221725A JP2019221725A JP2021092039A JP 2021092039 A JP2021092039 A JP 2021092039A JP 2019221725 A JP2019221725 A JP 2019221725A JP 2019221725 A JP2019221725 A JP 2019221725A JP 2021092039 A JP2021092039 A JP 2021092039A
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anchor
hole
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concrete
new
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JP7362210B2 (en
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正彦 成願
Masahiko Jogan
正彦 成願
洋一 窪田
Yoichi Kubota
洋一 窪田
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KFC Ltd
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Abstract

To provide a construction method of an anchor for concrete which is excellent in construction efficiency, minimizes a load applied to a concrete skeleton, and surely maintains strength and durability required for the concrete skeleton.SOLUTION: A construction method of an anchor for concrete comprises: a first step of extracting an existing original anchor 50 from an existing hole 101 of a concrete skeleton 100; a second step of drilling a new hole 102 concentrically with the existing hole 101 with a drilling diameter larger than a diameter of the existing hole 101, preferably with a drilling depth deeper than a depth of the existing hole 101; and a third step of placing a new renewal anchor 10 in the new hole 102.SELECTED DRAWING: Figure 3

Description

本発明は、コンクリート躯体に設置された既存のアンカーを取り外し、新たなアンカーに置き換えるコンクリート用アンカーの施工方法に関する。 The present invention relates to a method for constructing a concrete anchor in which an existing anchor installed on a concrete skeleton is removed and replaced with a new anchor.

コンクリート躯体にアンカーが設置されて取付物が取り付けられている場合に、錆が生じた等の理由で不要になったアンカー又は新しい取付物に適合しないアンカーを取り外し、別の新しいアンカーに置き換えることがある。例えば内周に取付ボルトが螺合される雌ねじが形成され、先端側に拡開片が形成された本体と、本体の打込みで本体側に圧入されるコーンからなる本体打込式アンカーを、特許文献１、２のようなアンカー抜取具を用いてコンクリート躯体から引き抜いて撤去し、撤去した既存のアンカーに代えて、別の新しいアンカーをコンクリート躯体に打設することが行なわれている。 When an anchor is installed on a concrete skeleton and an attachment is attached, it is possible to remove an anchor that is no longer needed due to rust or other reasons or an anchor that does not fit the new attachment and replace it with another new anchor. is there. For example, a patented main body driving anchor consisting of a main body in which a female screw into which a mounting bolt is screwed is formed on the inner circumference and an expansion piece is formed on the tip side, and a cone that is press-fitted into the main body side by driving the main body. Anchor extraction tools such as those in Documents 1 and 2 are used to pull out the concrete skeleton to remove it, and instead of the existing anchor that has been removed, another new anchor is placed in the concrete skeleton.

この際、図１０に示すように、コンクリート躯体３００に形成されている既存のアンカーの打設で残った既設穴３０１にモルタル３０２を充填して埋め戻し、その近くの別の場所に改めて削孔を施して新しく新設穴３０３を形成し、この別の場所の新設穴３０３に別の新たなアンカーを打設している。図１０において、Ｓ１０はコンクリート躯体３００の破壊想定面、Ｒ１０は既存のアンカーで引張応力が持続的に負荷された応力負荷済領域である。 At this time, as shown in FIG. 10, the existing hole 301 remaining by placing the existing anchor formed in the concrete skeleton 300 is filled with mortar 302 and backfilled, and a hole is drilled again in another place near the hole. A new hole 303 is formed, and another new anchor is placed in the new hole 303 at another location. In FIG. 10, S10 is a fracture surface of the concrete skeleton 300, and R10 is a stress-loaded region in which tensile stress is continuously applied by an existing anchor.

尚、特許文献３には、コンクリート躯体に形成する穴の長手方向の途中部位に部分拡径部を形成する部分拡径部削成ツールが開示されている。 In addition, Patent Document 3 discloses a partial diameter-expanded portion cutting tool for forming a partially enlarged-diameter portion in an intermediate portion in the longitudinal direction of a hole formed in a concrete skeleton.

特開２０１５−７１２１６号公報Japanese Unexamined Patent Publication No. 2015-71216 特開２００５−６６７２５号公報Japanese Unexamined Patent Publication No. 2005-66725 特開２０１２−７１５０５号公報Japanese Unexamined Patent Publication No. 2012-71505

ところで、上述の如く、既存のアンカーの打設で残った既設穴３０１にモルタル３０２を充填して埋め戻し、別の場所の新設穴３０３を形成する工法では、既設穴３０１を埋め戻すためのモルタル注入作業に労力を要し、施工効率に劣る。更に、埋め戻した既設穴３０１の近くに新たなアンカーを打設する新設穴３０３を削孔することから、コンクリート躯体３００が穴だらけになってしまい、コンクリート躯体に大きな負荷がかかり、強度や耐久性の低下が懸念される。 By the way, as described above, in the construction method in which the existing hole 301 remaining by driving the existing anchor is filled with the mortar 302 and backfilled to form the new hole 303 at another place, the mortar for backfilling the existing hole 301 is used. Labor is required for injection work, and construction efficiency is inferior. Further, since the new hole 303 for driving a new anchor is drilled near the backfilled existing hole 301, the concrete skeleton 300 becomes full of holes, and a large load is applied to the concrete skeleton, resulting in strength and durability. There is concern about deterioration of sex.

本発明は上記課題に鑑み提案するものであって、施工効率に優れると共に、コンクリート躯体にかかる負荷を最小限に留め、コンクリート躯体に必要とされる強度や耐久性を確実に維持することができるコンクリート用アンカー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 problems, and is excellent in construction efficiency, minimizes the load applied to the concrete skeleton, and can surely maintain the strength and durability required for the concrete skeleton. An object of the present invention is to provide a method for constructing an anchor for concrete.

本発明のコンクリート用アンカーの施工方法は、コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、前記既設穴と同心状に、前記既設穴より径が大きい削孔径で新設穴を削孔する第２工程と、前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とする。
これによれば、既設穴を埋め戻すためのモルタル注入作業が不要になり、コンクリート用アンカーの施工効率を高めることができる。また、既設穴とは異なるコンクリート躯体の新たな場所に新設穴を形成せずに済むことから、コンクリート躯体にかかる負荷を最小限に留め、コンクリート躯体に必要とされる強度や耐久性を確実に維持することができる。また、既設穴より径が大きい削孔径の新設穴に更新アンカーを打設することにより、元アンカーが引張応力を与えていた応力負荷済領域より外側の健全なコンクリートの領域を利用して、更新アンカーを確実に効かせることができる。また、既設穴と同心状に、既設穴より径が大きい削孔径で新設穴を形成することにより、既設穴をガイドの下穴として利用し、真っ直ぐに同心状の新設穴を形成することができ、かかる観点からもコンクリート用アンカーの施工効率に優れる。 The method for constructing a concrete anchor of the present invention is the first step of extracting an existing original anchor from an existing hole in a concrete skeleton, and cutting a new hole concentrically with the existing hole with a hole diameter larger than that of the existing hole. It is characterized by including a second step of making a hole and a third step of placing a new renewal anchor in the new hole.
According to this, the mortar injection work for backfilling the existing hole becomes unnecessary, and the construction efficiency of the concrete anchor can be improved. In addition, since it is not necessary to form a new hole in a new place of the concrete skeleton different from the existing hole, the load applied to the concrete skeleton is minimized, and the strength and durability required for the concrete skeleton are ensured. Can be maintained. In addition, by placing an update anchor in a new hole with a drilling diameter larger than the existing hole, the area of healthy concrete outside the stress-loaded area where the original anchor was applying tensile stress is used for update. The anchor can be used reliably. In addition, by forming a new hole concentrically with the existing hole with a drilling diameter larger than the existing hole, the existing hole can be used as a pilot hole for the guide and a straight concentric new hole can be formed. From this point of view, the construction efficiency of concrete anchors is excellent.

本発明のコンクリート用アンカーの施工方法は、前記第２工程において、前記既設穴より深さが深い削孔深さで前記新設穴を削孔することを特徴とする。
これによれば、既設穴より深さが深い削孔深さの新設穴に更新アンカーを打設することにより、元アンカーが引張応力を与えていた応力負荷済領域より外側の健全なコンクリートの領域をより広範囲に利用して、更新アンカーをより確実に効かせることができる。 The method for constructing an anchor for concrete of the present invention is characterized in that, in the second step, the new hole is drilled at a drilling depth deeper than the existing hole.
According to this, by placing an update anchor in a new hole with a drilling depth deeper than the existing hole, a healthy concrete area outside the stress-loaded area where the original anchor applied tensile stress. Can be used more extensively to make the update anchor work more reliably.

本発明のコンクリート用アンカーの施工方法は、コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、前記既設穴と同心状に、前記既設穴より深さが深い削孔深さで新設穴を削孔する第２工程と、前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とする。
これによれば、既設穴を埋め戻すためのモルタル注入作業が不要になり、コンクリート用アンカーの施工効率を高めることができる。また、既設穴とは異なるコンクリート躯体の新たな場所に新設穴を形成せずに済むことから、コンクリート躯体にかかる負荷を最小限に留め、コンクリート躯体に必要とされる強度や耐久性を確実に維持することができる。また、既設穴より深さが深い削孔深さの新設穴に更新アンカーを打設することにより、元アンカーが引張応力を与えていた応力負荷済領域より外側の健全なコンクリートの領域を利用して、更新アンカーを確実に効かせることができる。 The method for constructing the concrete anchor of the present invention is the first step of extracting the existing original anchor from the existing hole of the concrete skeleton, and newly installing the existing hole concentrically with the existing hole and having a drilling depth deeper than the existing hole. It is characterized by including a second step of drilling a hole and a third step of driving a new renewal anchor into the new hole.
According to this, the mortar injection work for backfilling the existing hole becomes unnecessary, and the construction efficiency of the concrete anchor can be improved. In addition, since it is not necessary to form a new hole in a new place of the concrete skeleton different from the existing hole, the load applied to the concrete skeleton is minimized, and the strength and durability required for the concrete skeleton are ensured. Can be maintained. In addition, by placing an update anchor in a new hole with a drilling depth deeper than the existing hole, a healthy concrete area outside the stress-loaded area where the original anchor applied tensile stress is used. Therefore, the update anchor can be surely worked.

本発明のコンクリート用アンカーの施工方法は、前記元アンカーが、内周に取付ボルトが螺合される雌ねじが形成され且つ先端側に拡開片が形成された本体と、先端側から本体側に圧入されて前記拡開片を拡開するコーンから構成される本体打込式アンカーであり、前記更新アンカーが、基部の先端側に先端に向かって漸次拡径するテーパ部が設けられ且つ前記基部の内周に取付ボルトが螺合される雌ねじが形成されたインナー部材と、先端側に前記テーパ部の圧入で拡張する拡張片が設けられたスリーブから構成されるスリーブ打込式アンカーであることを特徴とする。
これによれば、例えば既存のアンカー抜取具を用いて容易に本体打込式アンカーを抜き取り、撤去することができる。また、更新アンカーとされるスリーブ打込式アンカーは、インナー部材の雌ねじに取付ボルトが螺合され、取付ボルトに荷重が負荷されればテーパ部が拡張片により引き込まれて拡張力が生じ、定着力を増すことから、更新アンカーの定着力、支持力をより高めることができる。 In the method of constructing the concrete anchor of the present invention, the former anchor has a main body in which a female screw into which a mounting bolt is screwed is formed on the inner circumference and an expansion piece is formed on the tip side, and from the tip side to the main body side. It is a main body driving type anchor composed of a cone that is press-fitted to expand the expansion piece, and the renewal anchor is provided with a tapered portion that gradually expands in diameter toward the tip on the tip side of the base portion. A sleeve-driving anchor consisting of an inner member in which a female screw into which a mounting bolt is screwed is formed on the inner circumference of the shaft, and a sleeve provided with an expansion piece that expands by press-fitting the tapered portion on the tip side. It is characterized by.
According to this, for example, the main body driving type anchor can be easily pulled out and removed by using an existing anchor pulling tool. In the sleeve driving type anchor, which is used as an update anchor, the mounting bolt is screwed into the female screw of the inner member, and when a load is applied to the mounting bolt, the tapered portion is pulled in by the expansion piece to generate an expansion force and fix it. Since the force is increased, the fixing force and the supporting force of the renewal anchor can be further enhanced.

本発明のコンクリート用アンカーの施工方法は、コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、前記既設穴と同心状に、穴深さ方向の一部に部分拡径部を形成して新設穴を削孔する第２工程と、前記部分拡径部に拡張した拡張片を入り込ませるようにして前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とする。
これによれば、既設穴を埋め戻すためのモルタル注入作業が不要になり、コンクリート用アンカーの施工効率を高めることができる。また、既設穴とは異なるコンクリート躯体の新たな場所に新設穴を形成せずに済むことから、コンクリート躯体にかかる負荷を最小限に留め、コンクリート躯体に必要とされる強度や耐久性を確実に維持することができる。また、既設穴と同心状で、穴深さ方向の一部に部分拡径部を形成した新設穴に更新アンカーを打設することにより、元アンカーが引張応力を与えていた応力負荷済領域より外側の健全なコンクリートの領域を利用して、更新アンカーを確実に効かせることができる。 The method for constructing an anchor for concrete of the present invention is a first step of extracting an existing original anchor from an existing hole in a concrete skeleton, and forming a partially enlarged diameter portion in a part in the hole depth direction concentrically with the existing hole. It is characterized by including a second step of drilling a new hole and a third step of driving a new renewal anchor into the new hole so that an expanded expansion piece can be inserted into the partially enlarged diameter portion. To do.
According to this, the mortar injection work for backfilling the existing hole becomes unnecessary, and the construction efficiency of the concrete anchor can be improved. In addition, since it is not necessary to form a new hole in a new place of the concrete skeleton different from the existing hole, the load applied to the concrete skeleton is minimized, and the strength and durability required for the concrete skeleton are ensured. Can be maintained. In addition, by placing an update anchor in a new hole that is concentric with the existing hole and has a partially expanded portion formed in the hole depth direction, the stress-loaded area where the original anchor applied tensile stress An area of healthy concrete on the outside can be used to ensure that the renewal anchor works.

本発明のコンクリート用アンカーの施工方法は、前記第２工程において、前記既設穴より径が大きい削孔径で前記新設穴を削孔する、若しくは前記既設穴より深さが深い削孔深さで前記新設穴を削孔する、若しくは前記既設穴より径が大きい削孔径で且つ前記既設穴より深さが深い削孔深さで前記新設穴を削孔することを特徴とする。
これによれば、既設穴より径が大きい削孔径の新設穴、若しくは既設穴より深さが深い削孔深さの新設穴、若しくは既設穴より径が大きい削孔径で且つ既設穴より深さが深い削孔深さでの新設穴に更新アンカーを打設することにより、元アンカーが引張応力を与えていた応力負荷済領域より外側の健全なコンクリートの領域をより広範囲に利用して、更新アンカーをより確実に効かせることができる。 In the method for constructing an anchor for concrete of the present invention, in the second step, the new hole is drilled with a drilling diameter larger than the existing hole, or the drilling depth is deeper than the existing hole. It is characterized in that a new hole is drilled, or the new hole is drilled at a drilling diameter larger than that of the existing hole and deeper than the existing hole.
According to this, a new hole with a drilling diameter larger than the existing hole, a new hole with a drilling depth deeper than the existing hole, or a drilling diameter larger than the existing hole and deeper than the existing hole. By placing a renewal anchor in a new hole at a deep drilling depth, the renewal anchor can be used more extensively in the healthy concrete area outside the stressed area where the original anchor was stressed. Can be used more reliably.

本発明のコンクリート用アンカーの施工方法は、前記元アンカーが、内周に取付ボルトが螺合される雌ねじが形成され且つ先端側に拡張片が形成された本体と、前記本体の打込みにより本体側に圧入されたコーンから構成される本体打込式アンカーであり、前記更新アンカーが、基部の先端側に先端に向かって漸次拡径するテーパ部が設けられ且つ前記基部の後端側に雄ねじ部が設けられている軸体と、基筒の先端側に薄肉部を介して前記テーパ部の圧入で拡張する拡張片が設けられたアウター部材から構成される拡底式アンカーであることを特徴とする。
これによれば、例えば既存のアンカー抜取具を用いて容易に本体打込式アンカーを抜き取り、撤去することができる。また、更新アンカーとされる拡底式アンカーは、部分拡径部を有する新設穴において部分拡径部で拡張片を開き、軸体に引抜方向の力が作用した時に、開いた拡張片から外側に向けてコンクリートを押す方向に力が作用するため、非常に大きな定着力を発現し、更新アンカーの定着力、支持力をより高めることができる。 In the method of constructing the concrete anchor of the present invention, the original anchor has a main body in which a female screw into which a mounting bolt is screwed is formed on the inner circumference and an expansion piece is formed on the tip side, and the main body side by driving the main body. It is a main body driving type anchor composed of a cone press-fitted into the base, and the renewal anchor is provided with a tapered portion that gradually expands in diameter toward the tip on the tip side of the base, and a male screw portion on the rear end side of the base. It is a bottom-expanding anchor composed of a shaft body provided with an outer member and an outer member provided with an expansion piece that expands by press-fitting the tapered portion via a thin-walled portion on the tip end side of the base cylinder. ..
According to this, for example, the main body driving type anchor can be easily pulled out and removed by using an existing anchor pulling tool. In addition, the bottom-expanded anchor, which is used as an update anchor, opens an expansion piece at the partially expanded portion in a new hole having a partially expanded portion, and when a force in the pulling direction is applied to the shaft body, the expanded piece is moved outward from the opened expansion piece. Since the force acts in the direction of pushing the concrete toward the concrete, a very large fixing force can be exhibited, and the fixing force and the supporting force of the renewal anchor can be further enhanced.

本発明のコンクリート用アンカーの施工方法によれば、優れた施工効率で施工することができると共に、コンクリート躯体にかかる負荷を最小限に留め、コンクリート躯体に必要とされる強度や耐久性を確実に維持することができる。 According to the construction method of the concrete anchor of the present invention, it can be constructed with excellent construction efficiency, the load applied to the concrete skeleton is minimized, and the strength and durability required for the concrete skeleton are ensured. Can be maintained.

（ａ）は本発明による実施形態のコンクリート用アンカーの施工方法で置き換えられる元アンカーの分解正面図、（ｂ）は同元アンカーの右側面図、（ｃ）は同元アンカーの本体とコーンの縦断面図、（ｄ）は同元アンカーがコンクリート躯体に打設されて取付物が取り付けられている状態の断面説明図。(A) is an exploded front view of the original anchor replaced by the concrete anchor construction method of the embodiment according to the present invention, (b) is a right side view of the original anchor, and (c) is the main body and cone of the same original anchor. A vertical cross-sectional view, (d) is a cross-sectional explanatory view of a state in which the same anchor is cast on a concrete skeleton and an attachment is attached. （ａ）は本発明による第１実施形態のコンクリート用アンカーの施工方法で置き換える更新アンカーの分解正面図、（ｂ）は同更新アンカーのスリーブとインナー部材の縦断面図、（ｃ）は同更新アンカーがコンクリート躯体に打設されて取付物が取り付けられている状態の断面説明図。(A) is an exploded front view of the renewal anchor replaced by the concrete anchor construction method of the first embodiment according to the present invention, (b) is a vertical sectional view of the sleeve and inner member of the renewal anchor, and (c) is the same renewal. A cross-sectional explanatory view of a state in which an anchor is driven into a concrete skeleton and an attachment is attached. （ａ）〜（ｆ）は第１実施形態のコンクリート用アンカーの施工方法の施工手順を説明する説明図。(A) to (f) are explanatory views explaining the construction procedure of the construction method of the concrete anchor of the 1st embodiment. 実施形態のコンクリート用アンカーの施工方法で置き換えられる元アンカーによるコンクリート躯体への応力負荷済領域を説明する説明図。The explanatory view explaining the stress-loaded area to the concrete skeleton by the former anchor which is replaced by the construction method of the concrete anchor of embodiment. 第１実施形態のコンクリート用アンカーの施工方法で置き換える更新アンカーの打設状態を説明する説明図。Explanatory drawing explaining the driving state of the renewal anchor to be replaced by the construction method of the concrete anchor of 1st Embodiment. 第１実施形態のコンクリート用アンカーの施工方法で置き換える更新アンカーと同更新アンカーで置き換えられた元アンカーの引抜載荷試験の結果を示すグラフ。The graph which shows the result of the pull-out loading test of the renewal anchor which is replaced by the construction method of the concrete anchor of 1st Embodiment, and the original anchor which was replaced by the same renewal anchor. （ａ）は本発明による第２実施形態のアンカーの施工方法で置き換える更新アンカーの正面図、（ｂ）は同図（ａ）のＡ−Ａ端面図、（ｃ）は同更新アンカーの縦断面図、（ｄ）は同更新アンカーの軸体の正面図、（ｅ）は同更新アンカーがコンクリート躯体に打設された状態の断面説明図、（ｆ）は同更新アンカーがコンクリート躯体に打設されて取付物が取り付けられている状態の断面説明図。(A) is a front view of the renewal anchor replaced by the method of constructing the anchor of the second embodiment according to the present invention, (b) is an end view of AA of the same figure (a), and (c) is a vertical cross section of the renewal anchor. (D) is a front view of the shaft body of the renewal anchor, (e) is a cross-sectional explanatory view of the state where the renewal anchor is placed on the concrete skeleton, and (f) is a cross-sectional explanatory view of the renewal anchor placed on the concrete skeleton. A cross-sectional explanatory view of a state in which an anchor is attached. （ａ）〜（ｆ）は第２実施形態のコンクリート用アンカーの施工方法の施工手順を説明する説明図。(A) to (f) are explanatory views explaining the construction procedure of the construction method of the concrete anchor of the second embodiment. 第２実施形態のコンクリート用アンカーの施工方法で置き換える更新アンカーの打設状態を説明する説明図。Explanatory drawing explaining the driving state of the renewal anchor to be replaced by the construction method of the concrete anchor of 2nd Embodiment. 従来のコンクリート躯体におけるアンカーの置き換えを説明する説明図。Explanatory drawing explaining the replacement of an anchor in a conventional concrete skeleton.

〔第１実施形態のコンクリート用アンカーの施工方法〕
本発明による第１実施形態のコンクリート用アンカーの施工方法は、コンクリート躯体１００の既設穴１０１から図１に示す既存の元アンカー５０を抜き取った後、コンクリート躯体１００に既設穴１０１と同心状に形成した新設穴１０２に図２に示す新たな更新アンカー１０を打設する施工方法である。 [Construction method of concrete anchor of the first embodiment]
In the method of constructing the concrete anchor of the first embodiment according to the present invention, the existing original anchor 50 shown in FIG. 1 is extracted from the existing hole 101 of the concrete skeleton 100, and then the concrete skeleton 100 is formed concentrically with the existing hole 101. This is a construction method in which a new renewal anchor 10 shown in FIG. 2 is placed in the new hole 102.

図１の元アンカー５０は、本体打込式アンカーであり、略円筒状の本体５１と、本体５１の先端側に挿入して配置されるコーン５２を有する。本体５１には、後部の内周に雌ねじ５１１が形成されており、雌ねじ５１１に図示例では全ねじボルトである取付ボルト５３が螺合可能になっている。本体５１の前部には先端から切り込まれて軸方向に延びるスリット５１２が形成され、スリット５１２は周方向に所定間隔を開けて複数設けられている。本体５１の周方向におけるスリット５１２・５１２間の部分は拡開片５１３になっており、本体５１の先端側に複数の拡開片５１３が周方向に並んで設けられている。拡開片５１３の外面には摩擦抵抗で定着力を高める凹凸５１４が形成されている。 The original anchor 50 of FIG. 1 is a main body driving type anchor, and has a substantially cylindrical main body 51 and a cone 52 inserted and arranged on the tip end side of the main body 51. A female screw 511 is formed on the inner circumference of the rear portion of the main body 51, and a mounting bolt 53, which is a full-thread bolt in the illustrated example, can be screwed onto the female screw 511. A slit 512 that is cut from the tip and extends in the axial direction is formed in the front portion of the main body 51, and a plurality of slits 512 are provided at predetermined intervals in the circumferential direction. The portion between the slits 512 and 512 in the circumferential direction of the main body 51 is an expansion piece 513, and a plurality of expansion pieces 513 are provided side by side in the circumferential direction on the tip end side of the main body 51. Concavo-convex 514 that enhances the fixing force by frictional resistance is formed on the outer surface of the expansion piece 513.

コーン５２は、略円柱状で短尺の基部５２１と、基部５２１の先端側に設けられ、先端に向かって漸次拡径するテーパ部５２２を有する。基部５２１の外径は、本体５１の非拡開状態の拡開片５１３で構成される内径と略同一径か、僅かに小さい径で形成されており、本体５１の非拡開状態では、本体５１の先端部に基部５２１が嵌挿される。 The cone 52 has a substantially columnar and short base portion 521, and a tapered portion 522 provided on the tip end side of the base portion 521 and gradually increasing in diameter toward the tip end. The outer diameter of the base portion 521 is formed to be substantially the same as or slightly smaller than the inner diameter of the expanded piece 513 in the non-expanded state of the main body 51, and in the non-expanded state of the main body 51, the main body is formed. The base portion 521 is fitted and inserted into the tip end portion of the 51.

元アンカー５０は、図１（ｄ）に示すように、コンクリート躯体１００の既設穴１０１にコーン５２を先端側に配置して打設される。打設された本体打込式アンカーの元アンカー５０では、本体５１の穴奥側への打込みでコーン５２が本体５１側、換言すれば拡開片５１３側に相対的に圧入され、コーン５２の圧入で拡開された拡開片５１３が既設穴１０１の周壁に食い込むようにして定着されている。そして、打設された本体５１の雌ねじ５１１に取付ボルト５３が螺着される。螺着された取付ボルト５３には取付物１５１が外挿され、取付物１５１の外側から取付ボルト５３にワッシャー１６１を外挿してナット１６２を螺合し、取付物１５１がコンクリート躯体１００に取り付けられる。 As shown in FIG. 1D, the original anchor 50 is placed by arranging the cone 52 on the tip side in the existing hole 101 of the concrete skeleton 100. In the original anchor 50 of the driven main body driving type anchor, the cone 52 is relatively press-fitted to the main body 51 side, in other words, the expansion piece 513 side by driving into the hole back side of the main body 51, and the cone 52 is pressed into the cone 52. The expansion piece 513 expanded by press fitting is fixed so as to bite into the peripheral wall of the existing hole 101. Then, the mounting bolt 53 is screwed onto the female screw 511 of the main body 51 that has been driven. The mounting object 151 is extrapolated to the screwed mounting bolt 53, the washer 161 is extrapolated to the mounting bolt 53 from the outside of the mounting object 151, the nut 162 is screwed, and the mounting object 151 is mounted on the concrete skeleton 100. ..

図２の更新アンカー１０は、元アンカー５０と同じねじ径の取付ボルトが取り付けられるスリーブ打込式アンカーであり、略円筒状のスリーブ１１と、スリーブ１１の先端側に挿入して配置されるインナー部材１２を有する。スリーブ１１の前部には、先端から切り込まれて軸方向に延びるスリット１１１が形成され、スリット１１１は周方向に所定間隔を開けて複数設けられている。スリーブ１１の周方向におけるスリット１１１・１１１間の部分は拡張片１１２になっており、スリーブ１１の先端側に複数の拡張片１１２が周方向に並んで設けられている。拡張片１１２の外面には摩擦抵抗で定着力を高める凹凸１１３が形成されている。 The update anchor 10 of FIG. 2 is a sleeve driving type anchor to which a mounting bolt having the same screw diameter as the original anchor 50 is attached, and is a substantially cylindrical sleeve 11 and an inner inserted and arranged on the tip side of the sleeve 11. It has a member 12. A slit 111 that is cut from the tip and extends in the axial direction is formed in the front portion of the sleeve 11, and a plurality of slits 111 are provided at predetermined intervals in the circumferential direction. The portion between the slits 111 and 111 in the circumferential direction of the sleeve 11 is an expansion piece 112, and a plurality of expansion pieces 112 are provided side by side in the circumferential direction on the tip end side of the sleeve 11. The outer surface of the expansion piece 112 is formed with unevenness 113 that enhances the fixing force by frictional resistance.

インナー部材１２は、後部を構成する略円柱状の基部１２１と、基部１２１の先端側に先端に向かって漸次拡径するように形成されたテーパ部１２２を有する。基部１２１の外径は、スリーブ１１の非拡張状態の拡張片１１２で構成される内径と略同一径か、僅かに小さい径で形成されており、スリーブ１１の非拡張状態では、スリーブ１１の拡張片１１２から後部１１４の一部に亘って基部１２１が嵌挿され、テーパ部１２２はスリーブ１１の先端側に全体を突出するようにして配置される。インナー部材１２の基部１２１の内周には雌ねじ１２３が形成されており、雌ねじ１２３に図示例では全ねじボルトである取付ボルト１３が螺合可能になっている。 The inner member 12 has a substantially columnar base portion 121 forming a rear portion, and a tapered portion 122 formed on the tip end side of the base portion 121 so as to gradually increase in diameter toward the tip end. The outer diameter of the base 121 is formed to be substantially the same as or slightly smaller than the inner diameter of the expansion piece 112 of the sleeve 11 in the non-expanded state. In the non-expanded state of the sleeve 11, the sleeve 11 is expanded. The base portion 121 is fitted and inserted from the piece 112 to a part of the rear portion 114, and the tapered portion 122 is arranged so as to project entirely toward the tip end side of the sleeve 11. A female screw 123 is formed on the inner circumference of the base portion 121 of the inner member 12, and a mounting bolt 13 which is a full-thread bolt in the illustrated example can be screwed into the female screw 123.

更新アンカー１０は、図２（ｃ）に示すように、コンクリート躯体１００の新設穴１０２にインナー部材１２を先端側に配置して打設される。打設されたスリーブ打込式アンカーの更新アンカー１０では、スリーブ１１の穴奥側への打込みでインナー部材１２のテーパ部１２２がスリーブ１１側、換言すれば拡張片１１２側に相対的に圧入され、テーパ部１２２の圧入で拡張された拡張片１１２が新設穴１０２の周壁に食い込むようにして定着されている。そして、打設されたインナー部材１２の雌ねじ１２３に取付ボルト１３が螺着される。螺着された取付ボルト１３には取付物１５２が外挿され、取付物１５２の外側から取付ボルト１３にワッシャー１６３を外挿してナット１６４を螺合し、取付物１５２がコンクリート躯体１００に取り付けられる。 As shown in FIG. 2C, the renewal anchor 10 is placed by arranging the inner member 12 on the tip side in the new hole 102 of the concrete skeleton 100. In the renewal anchor 10 of the driven sleeve driving type anchor, the tapered portion 122 of the inner member 12 is relatively press-fitted to the sleeve 11 side, in other words, the expansion piece 112 side, by driving the sleeve 11 into the hole back side. The expansion piece 112 expanded by press-fitting the tapered portion 122 is fixed so as to bite into the peripheral wall of the new hole 102. Then, the mounting bolt 13 is screwed onto the female screw 123 of the driven inner member 12. The mounting object 152 is extrapolated to the screwed mounting bolt 13, a washer 163 is extrapolated to the mounting bolt 13 from the outside of the mounting object 152, the nut 164 is screwed, and the mounting object 152 is mounted on the concrete skeleton 100. ..

第１実施形態のコンクリート用アンカーの施工方法で既存の元アンカー５０を更新アンカー１０に置き換える際には、例えばコンクリート躯体１００の既設穴１０１に元アンカー５０が打設され、取付物１５１が取り付けられている状態から、ナット１６２、ワッシャー１６１を取付ボルト５３から取り外し、取付物１５１を取付ボルト５３から外し、更に元アンカー５０の本体５１に螺合された取付ボルト５３を本体５１から取り外す。そして、例えば特許文献１、２のような既存のアンカー抜取具を用い、既設穴１０１から本体５１、コーン５２を抜き取ることにより、既設穴１０１から既存の元アンカー５０を抜き取って撤去する（図３（ａ）、（ｂ）参照）。図３（ｂ）において、Ｄ１は既設穴１０１の径、Ｌ１は既設穴１０１の深さであり、既設穴１０１の深さＬ１は既設穴１０１の外径部分の深さになっている。 When replacing the existing original anchor 50 with the renewal anchor 10 in the concrete anchor construction method of the first embodiment, for example, the original anchor 50 is driven into the existing hole 101 of the concrete skeleton 100, and the attachment 151 is attached. The nut 162 and the washer 161 are removed from the mounting bolt 53, the mounting object 151 is removed from the mounting bolt 53, and the mounting bolt 53 screwed into the main body 51 of the original anchor 50 is removed from the main body 51. Then, by using an existing anchor extraction tool such as Patent Documents 1 and 2 to extract the main body 51 and the cone 52 from the existing hole 101, the existing original anchor 50 is extracted from the existing hole 101 and removed (FIG. 3). (A), (b)). In FIG. 3B, D1 is the diameter of the existing hole 101, L1 is the depth of the existing hole 101, and the depth L1 of the existing hole 101 is the depth of the outer diameter portion of the existing hole 101.

その後、図３（ｃ）、（ｄ）に示すように、ドリル１７１で既設穴１０１と同心状に削孔し、既設穴１０１より径が大きい削孔径で、且つ既設穴１０１より深さが深い削孔深さで、既設穴１０１と同心状の新設穴１０２をコンクリート躯体１００に削孔する。図３（ｄ）において、Ｄ２は新設穴１０２の径であり、新設穴１０２の径Ｄ２＞既設穴１０１の径Ｄ１の関係になっている。また、図３（ｄ）において、Ｌ２は新設穴１０２の深さであり、新設穴１０２の深さＬ２は新設穴１０２の外径部分の深さになっていると共に、新設穴１０２の深さＬ２＞既設穴１０１の深さＬ１の関係になっている。 After that, as shown in FIGS. 3 (c) and 3 (d), a hole is drilled concentrically with the existing hole 101 with a drill 171 to have a hole diameter larger than that of the existing hole 101 and a depth deeper than that of the existing hole 101. At the drilling depth, a new hole 102 concentric with the existing hole 101 is drilled into the concrete skeleton 100. In FIG. 3D, D2 is the diameter of the new hole 102, and the relationship is such that the diameter D2 of the new hole 102> the diameter D1 of the existing hole 101. Further, in FIG. 3D, L2 is the depth of the new hole 102, the depth L2 of the new hole 102 is the depth of the outer diameter portion of the new hole 102, and the depth of the new hole 102. L2> The depth L1 of the existing hole 101.

次いで、スリーブ打込式アンカーである新たな更新アンカー１０のスリーブ１１とインナー部材１２をインナー部材１２を先端側に配置するようにして新設穴１０２に挿入する。そして、打込具１７２及びハンマー１７３を用いてスリーブ１１を穴奥側に打ち込み、インナー部材１２のテーパ部１２２をスリーブ１１の拡張片１１２側に相対的に圧入し、テーパ部１２２の圧入で拡開された拡張片１１２を新設穴１０２の周壁に食い込ませ、更新アンカー１０を新設穴１０２に打設する（図３（ｅ）、（ｆ）参照）。尚、本例のスリーブ打込式アンカーの更新アンカー１０は、インナー部材１２の内周に雌ねじ１２３が形成されていることから、通常は本例の本体打込式アンカーの元アンカー５０よりも外径が大きくなる。 Next, the sleeve 11 and the inner member 12 of the new renewal anchor 10 which is a sleeve driving type anchor are inserted into the new hole 102 so that the inner member 12 is arranged on the tip side. Then, the sleeve 11 is driven into the hole back side using the driving tool 172 and the hammer 173, the tapered portion 122 of the inner member 12 is press-fitted relatively to the expansion piece 112 side of the sleeve 11, and the tapered portion 122 is press-fitted to expand. The opened expansion piece 112 is made to bite into the peripheral wall of the new hole 102, and the renewal anchor 10 is driven into the new hole 102 (see FIGS. 3 (e) and 3 (f)). Since the internal thread 123 is formed on the inner circumference of the inner member 12, the renewal anchor 10 of the sleeve driving type anchor of this example is usually outside the original anchor 50 of the main body driving type anchor of this example. The diameter becomes large.

その後、図３（ｆ）に示すように、更新アンカー１０のインナー部材１２の雌ねじ１２３に取付ボルト１３を螺合し、螺合した取付ボルト１３に取付物１５２を外挿し、取付物１５２の外側から取付ボルト１３にワッシャー１６３を外挿してナット１６４を螺合し、取付物１５２をコンクリート躯体１００に取り付ける。これにより、第１実施形態のコンクリート用アンカーの施工方法による元アンカー５０の更新アンカー１０への置き換え、取付物１５２の更新アンカー１０による取り付けが完了する。尚、取付物１５１と取付物１５２は同一物でも異なる物でも良い。 After that, as shown in FIG. 3 (f), the mounting bolt 13 is screwed into the female screw 123 of the inner member 12 of the renewal anchor 10, the mounting object 152 is externally inserted into the screwed mounting bolt 13, and the outside of the mounting object 152 is externally inserted. The washer 163 is externally inserted into the mounting bolt 13 and the nut 164 is screwed in, and the mounting object 152 is mounted on the concrete skeleton 100. As a result, the replacement of the original anchor 50 with the renewal anchor 10 by the construction method of the concrete anchor of the first embodiment and the attachment of the attachment 152 by the renewal anchor 10 are completed. The attachment 151 and the attachment 152 may be the same or different.

ここで、元アンカー５０と更新アンカー１０の打設状態、コンクリート躯体１００の破壊想定面について説明する。図４に示すように、コンクリートはその性質上、打設されたアンカーの先端部分からコンクリート躯体１００の表面１０３に向かってα１=４５度の角度で剪断破壊しようとし、元アンカー５０の最大引抜応力がコンクリート破壊で決まる場合、コンクリート躯体１００は図示のコーン状の破壊想定面Ｓ１で破断することが想定される。従って、それまで取付物１５１を支えていた元アンカー５０がコンクリート躯体１００に引張応力を与えて持続的に影響を与えていた応力負荷済領域は図４の応力負荷済領域Ｒ１となる。 Here, the driving state of the original anchor 50 and the renewal anchor 10 and the assumed fracture surface of the concrete skeleton 100 will be described. As shown in FIG. 4, due to its nature, concrete attempts to shear fracture from the tip of the cast anchor toward the surface 103 of the concrete skeleton 100 at an angle of α1 = 45 degrees, and the maximum withdrawal stress of the original anchor 50. Is determined by concrete fracture, it is assumed that the concrete skeleton 100 is fractured at the cone-shaped fracture assumption surface S1 shown in the figure. Therefore, the stress-loaded region in which the original anchor 50, which has supported the attachment 151 until then, applies tensile stress to the concrete skeleton 100 and continuously affects the concrete skeleton 100 is the stress-loaded region R1 in FIG.

他方で、元アンカー５０と同心状に打設された更新アンカー１０は、既設穴１０１より径が大きく、且つ既設穴１０１より深さが深い新設穴１０２に打設されており、図５に示すように、アンカー先端部分からコンクリート躯体１００の表面１０３に向かってα２=４５度の角度で剪断破壊しようとし、更新アンカー１０の最大引抜応力がコンクリート破壊で決まる場合、コンクリート躯体１００は図示のコーン状の破壊想定面Ｓ２で破断することが想定される。そして、更新アンカー１０が取付物１５２を支えてコンクリート躯体１００に引張応力が与えられていく応力負荷想定領域は、応力負荷済領域Ｒ１に加え、応力負荷済領域Ｒ１の外側で破壊想定面Ｓ２より内側の領域で引張応力がそれまで持続的に負荷されていない健全領域Ｒ２となる。即ち、元アンカー５０が引張応力を与えていた応力負荷済領域Ｒ１より外側のコンクリートの健全領域Ｒ２を利用して、更新アンカー５０を確実に効かせることができる。 On the other hand, the renewal anchor 10 driven concentrically with the original anchor 50 is driven into the new hole 102 having a diameter larger than that of the existing hole 101 and deeper than the existing hole 101, and is shown in FIG. As described above, when an attempt is made to shear fracture from the tip of the anchor toward the surface 103 of the concrete skeleton 100 at an angle of α2 = 45 degrees and the maximum withdrawal stress of the renewal anchor 10 is determined by the concrete fracture, the concrete skeleton 100 has a cone shape as shown in the figure. It is assumed that the concrete will break on the assumed fracture surface S2. Then, the stress-loaded assumed region in which the renewal anchor 10 supports the attachment 152 and the tensile stress is applied to the concrete skeleton 100 is, in addition to the stress-loaded region R1, from the fracture assumed surface S2 outside the stress-loaded region R1. In the inner region, the tensile stress becomes a healthy region R2 in which the tensile stress has not been continuously applied until then. That is, the renewal anchor 50 can be reliably applied by utilizing the sound region R2 of the concrete outside the stress-loaded region R1 to which the original anchor 50 has applied the tensile stress.

図６に第１実施形態のコンクリート用アンカーの施工方法で置き換える更新アンカー１０と同更新アンカー１０で置き換えられた元アンカー５０の引抜載荷試験の結果を示す。この引抜載荷試験では、コンクリート躯体の異なる場所に打設した元アンカー５０と同一構成である元アンカーＰ１、Ｐ２、Ｐ３に引抜試験を行い、負荷した荷重とアンカーの変位を測定した。元アンカーＰ１、Ｐ２、Ｐ３が打設されていたコンクリート躯体の既設穴の径Ｄ１は１８ｍｍ、既設穴１０１の深さＬ１は５６ｍｍであり、又、元アンカーＰ１、Ｐ２、Ｐ３は取付ボルト５３のねじ径Ｍ１２に対応するものである。 FIG. 6 shows the results of the pull-out loading test of the renewal anchor 10 replaced by the concrete anchor construction method of the first embodiment and the original anchor 50 replaced by the renewal anchor 10. In this pull-out loading test, a pull-out test was performed on the original anchors P1, P2, and P3 having the same configuration as the original anchor 50 placed in different places on the concrete skeleton, and the applied load and the displacement of the anchor were measured. The diameter D1 of the existing hole of the concrete skeleton in which the original anchors P1, P2 and P3 were placed is 18 mm, the depth L1 of the existing hole 101 is 56 mm, and the original anchors P1, P2 and P3 are the mounting bolts 53. It corresponds to the screw diameter M12.

更に、元アンカーＰ１、Ｐ２、Ｐ３に引抜試験で抜き取った後に、同コンクリート躯体に元アンカーＰ１、Ｐ２、Ｐ３に対応する各既設穴と同心状に、径Ｄ２：２２．５ｍｍ、深さＬ２：６７ｍｍで新設穴をそれぞれ形成し、各新設穴に更新アンカー１０と同一構成である更新アンカーＰ１’、Ｐ２’、Ｐ３’を打設した。更新アンカーＰ１’、Ｐ２’、Ｐ３’の打設位置はそれぞれ元アンカーＰ１、Ｐ２、Ｐ３に対応し、又、更新アンカーＰ１’、Ｐ２’、Ｐ３’は取付ボルト１３のねじ径Ｍ１２に対応するものである。そして、打設した更新アンカーＰ１’、Ｐ２’、Ｐ３’に引抜試験を行い、負荷した荷重とアンカーの変位を測定した。図６から明らかなように、既設穴１０１を同心状に再利用して新設穴１０２を形成し、新設穴１０２に更新アンカー１０を打設することにより、元アンカー５０よりも引抜強度、支持力がより高い更新アンカー５０を設置することができる。 Further, after the original anchors P1, P2, and P3 are extracted by a pull-out test, the concrete skeleton is concentrically with the existing holes corresponding to the original anchors P1, P2, and P3, and has a diameter of D2: 22.5 mm and a depth of L2: New holes were formed at 67 mm, and renewal anchors P1', P2', and P3', which had the same configuration as the renewal anchor 10, were placed in each new hole. The placement positions of the renewal anchors P1', P2', and P3'correspond to the original anchors P1, P2, and P3, respectively, and the renewal anchors P1', P2', and P3'correspond to the screw diameter M12 of the mounting bolt 13. It is a thing. Then, a pull-out test was performed on the placed renewal anchors P1', P2', and P3', and the applied load and the displacement of the anchor were measured. As is clear from FIG. 6, the existing holes 101 are reused concentrically to form the new holes 102, and the renewal anchors 10 are driven into the new holes 102 to have higher pull-out strength and bearing capacity than the original anchors 50. A higher renewal anchor 50 can be installed.

第１実施形態のコンクリート用アンカーの施工方法によれば、既設穴１０１を埋め戻すためのモルタル注入作業が不要になり、コンクリート用アンカーの施工効率を高めることができる。また、既設穴１０１とは異なるコンクリート躯体の新たな場所に新設穴を形成せずに済むことから、コンクリート躯体１００にかかる負荷を最小限に留め、コンクリート躯体１００に必要とされる強度や耐久性を確実に維持することができる。 According to the concrete anchor construction method of the first embodiment, the mortar injection work for backfilling the existing hole 101 becomes unnecessary, and the concrete anchor construction efficiency can be improved. Further, since it is not necessary to form a new hole in a new place of the concrete skeleton different from the existing hole 101, the load applied to the concrete skeleton 100 is minimized, and the strength and durability required for the concrete skeleton 100 are minimized. Can be reliably maintained.

また、既設穴１０１より径が大きい削孔径の新設穴１０２に更新アンカー１０を打設することに加え、既設穴１０１より深さが深い削孔深さの新設穴１０２に更新アンカーを打設することにより、元アンカー５０が引張応力を与えていた応力負荷済領域Ｒ１より外側のコンクリートの健全領域Ｒ２を広範囲に利用して、更新アンカー１０をより確実に効かせることができる。 Further, in addition to driving the update anchor 10 into the new hole 102 having a drilling diameter larger than the existing hole 101, the update anchor is driven into the new hole 102 having a drilling depth deeper than the existing hole 101. As a result, the renewal anchor 10 can be more reliably applied by making extensive use of the sound region R2 of the concrete outside the stress-loaded region R1 to which the original anchor 50 has applied tensile stress.

また、既設穴１０１と同心状に、既設穴１０１より径が大きい削孔径で新設穴１０２を形成することにより、既設穴１０１をガイドの下穴として利用し、真っ直ぐに同心状の新設穴１０２を形成することができ、かかる観点からもコンクリート用アンカーの施工効率を高めることができる。 Further, by forming the new hole 102 concentrically with the existing hole 101 with a drilling diameter larger than that of the existing hole 101, the existing hole 101 is used as a pilot hole for the guide, and the new hole 102 having a straight concentric shape is formed. It can be formed, and from this point of view, the construction efficiency of the concrete anchor can be improved.

また、元アンカー５０を本体打込式アンカー、更新アンカー１０をスリーブ打込式アンカーとすることにより、例えば既存のアンカー抜取具を用いて容易に本体打込式アンカーを抜き取り、撤去することができる。また、更新アンカー１０とされるスリーブ打込式アンカーは、インナー部材１２の雌ねじ１２３に取付ボルト１３が螺合され、取付ボルト１３に荷重が負荷されればテーパ部１２２が拡張片１１２により引き込まれて拡張力が生じ、定着力を増すことから、更新アンカー１０の定着力、支持力をより高めることができる。 Further, by using the original anchor 50 as the main body driving type anchor and the renewal anchor 10 as the sleeve driving type anchor, the main body driving type anchor can be easily pulled out and removed by using an existing anchor extraction tool, for example. .. Further, in the sleeve driving type anchor to be the renewal anchor 10, the mounting bolt 13 is screwed into the female screw 123 of the inner member 12, and when a load is applied to the mounting bolt 13, the tapered portion 122 is pulled in by the expansion piece 112. As a result, an expanding force is generated and the fixing force is increased, so that the fixing force and the supporting force of the renewal anchor 10 can be further increased.

〔第２実施形態のコンクリート用アンカーの施工方法〕
本発明による第１実施形態のコンクリート用アンカーの施工方法は、コンクリート躯体１００の既設穴１０１から図１に示す既存の元アンカー５０を抜き取った後、コンクリート躯体１００に既設穴１０１と同心状に形成した新設穴１０４に図７に示す新たな更新アンカー２０を打設する施工方法である。尚、元アンカー５０の構成は第１実施形態と同一である。 [Construction method of concrete anchor of the second embodiment]
In the method of constructing the concrete anchor of the first embodiment according to the present invention, the existing original anchor 50 shown in FIG. 1 is extracted from the existing hole 101 of the concrete skeleton 100, and then the concrete skeleton 100 is formed concentrically with the existing hole 101. This is a construction method in which a new renewal anchor 20 shown in FIG. 7 is placed in the new hole 104. The configuration of the original anchor 50 is the same as that of the first embodiment.

図７の更新アンカー２０は、拡底式アンカーであり、略円筒状のアウター部材２１と、アウター部材２１に挿入して配置される軸体２２を有する。アウター部材２１の前部には、先端から切り込まれて軸方向に延びるスリット２１１が形成され、スリット２１１は周方向に所定間隔を開けて複数設けられている。アウター部材２１の周方向におけるスリット２１１・２１１間の部分は拡張片２１２になっており、アウター部材２１の先端側に複数の拡張片２１２が周方向に並んで設けられている。アウター部材２１の基筒２１３と前部との間には局所的に屈曲してヒンジとして機能する薄肉部２１４が形成されており、基筒２１３の先端側にヒンジ機能を有する薄肉部２１４を介して拡張片２１２が設けられている。 The update anchor 20 of FIG. 7 is a bottom-expanding anchor, and has a substantially cylindrical outer member 21 and a shaft body 22 inserted and arranged in the outer member 21. A slit 211 that is cut from the tip and extends in the axial direction is formed in the front portion of the outer member 21, and a plurality of slits 211 are provided at predetermined intervals in the circumferential direction. The portion between the slits 211 and 211 in the circumferential direction of the outer member 21 is an expansion piece 212, and a plurality of expansion pieces 212 are provided side by side in the circumferential direction on the tip end side of the outer member 21. A thin-walled portion 214 that is locally bent and functions as a hinge is formed between the base cylinder 213 and the front portion of the outer member 21, and a thin-walled portion 214 having a hinge function is formed on the tip end side of the base cylinder 213. An expansion piece 212 is provided.

軸体２２は、略円柱状の基部２２１を有し、基部２２１の先端側には先端に向かって漸次拡径するテーパ部２２２が設けられ、基部２２１の後端側には外周に雄ねじが形成された雄ねじ部２２３が設けられている。基部２２１及び雄ねじ部２２３の外径は、アウター部材２１の基筒２１３の内径及びこれと略同一の非拡張状態の拡張片２１２で構成される内径と略同一径か、僅かに小さい径で形成されており、アウター部材２１の非拡張状態では、アウター部材２１の拡張片２１２から基筒２１３に亘って軸体２２の基部２２１及び雄ねじ部２２３が嵌挿され、テーパ部２２２はアウター部材２１の先端側に全体を突出するようにして配置される。２２４は軸体２２に対してアウター部材２１を打ち込む位置を示す打込マークであり、打込マーク２２４がアウター部材２１から露出するまでアウター部材２１を打ち込むと、アウター部材２１の拡張片２１２が適切な位置と状態で拡張するようになっている。 The shaft body 22 has a substantially columnar base portion 221 and is provided with a tapered portion 222 whose diameter gradually increases toward the tip end side of the base portion 221 and a male screw is formed on the outer periphery on the rear end side of the base portion 221. The male screw portion 223 is provided. The outer diameters of the base portion 221 and the male screw portion 223 are formed to be substantially the same diameter as or slightly smaller than the inner diameter of the base cylinder 213 of the outer member 21 and the inner diameter composed of the expansion piece 212 in a non-expanded state substantially the same. In the non-expanded state of the outer member 21, the base portion 221 and the male screw portion 223 of the shaft body 22 are fitted and inserted from the expansion piece 212 of the outer member 21 to the base cylinder 213, and the tapered portion 222 is the outer member 21. It is arranged so that the entire surface protrudes toward the tip side. Reference numeral 224 is a driving mark indicating a position where the outer member 21 is driven into the shaft body 22, and when the outer member 21 is driven until the driving mark 224 is exposed from the outer member 21, the expansion piece 212 of the outer member 21 is appropriate. It is designed to expand in various positions and states.

更新アンカー２０は、図７（ｅ）、（ｆ）に示すように、コンクリート躯体１００の部分拡径部１０５を有する新設穴１０４に軸体２２のテーパ部２２２を先端側に配置して打設される。打設された拡底式アンカーの更新アンカー２０では、アウター部材２１の穴奥側への打込みで軸体２２のテーパ部２２２がアウター部材２１側、換言すれば拡張片２１２側に相対的に圧入され、テーパ部２２２の圧入で拡張された拡張片２１２が部分拡径部１０５に入り込むようにして拡張される。そして、コンクリート躯体１００の表面１０３から突出する軸体２２の雄ねじ部２２３に取付物１５３が外挿され、取付物１５３の外側から雄ねじ部２２３にワッシャー１６５を外挿してナット１６６を螺合し、取付物１５３がコンクリート躯体１００に取り付けられる。 As shown in FIGS. 7 (e) and 7 (f), the renewal anchor 20 is placed by arranging the tapered portion 222 of the shaft body 22 on the tip side in the new hole 104 having the partially enlarged diameter portion 105 of the concrete skeleton 100. Will be done. In the renewal anchor 20 of the bottom-expanded anchor that has been driven, the tapered portion 222 of the shaft body 22 is relatively press-fitted to the outer member 21 side, in other words, the expansion piece 212 side by driving the outer member 21 into the hole back side. , The expansion piece 212 expanded by press-fitting the tapered portion 222 is expanded so as to enter the partially enlarged diameter portion 105. Then, the attachment 153 is extrapolated to the male screw portion 223 of the shaft body 22 protruding from the surface 103 of the concrete skeleton 100, the washer 165 is extrapolated from the outside of the attachment 153 to the male screw portion 223, and the nut 166 is screwed. The attachment 153 is attached to the concrete skeleton 100.

第２実施形態のコンクリート用アンカーの施工方法で既存の元アンカー５０を更新アンカー２０に置き換える際には、例えばコンクリート躯体１００の既設穴１０１に元アンカー５０が打設され、取付物１５１が取り付けられている状態から、ナット１６２、ワッシャー１６１を取付ボルト５３から取り外し、取付物１５１を取付ボルト５３から外し、更に元アンカー５０の本体５１に螺合された取付ボルト５３を本体５１から取り外す。そして、第１実施形態と同様に、既存のアンカー抜取具を用い、既設穴１０１から本体５１、コーン５２を抜き取ることにより、既設穴１０１から既存の元アンカー５０を抜き取って撤去する（図８（ａ）、（ｂ）参照）。図８（ｂ）において、第１実施形態と同様、Ｄ１は既設穴１０１の径、Ｌ１は既設穴１０１の深さであり、既設穴１０１の深さＬ１は既設穴１０１の外径部分の深さになっている。 When replacing the existing original anchor 50 with the renewal anchor 20 in the concrete anchor construction method of the second embodiment, for example, the original anchor 50 is driven into the existing hole 101 of the concrete skeleton 100, and the attachment 151 is attached. The nut 162 and the washer 161 are removed from the mounting bolt 53, the mounting object 151 is removed from the mounting bolt 53, and the mounting bolt 53 screwed into the main body 51 of the original anchor 50 is removed from the main body 51. Then, as in the first embodiment, by using the existing anchor extraction tool and extracting the main body 51 and the cone 52 from the existing hole 101, the existing original anchor 50 is extracted from the existing hole 101 and removed (FIG. 8 (FIG. 8). a), (b)). In FIG. 8B, as in the first embodiment, D1 is the diameter of the existing hole 101, L1 is the depth of the existing hole 101, and the depth L1 of the existing hole 101 is the depth of the outer diameter portion of the existing hole 101. It has become.

その後、図８（ｃ）に示すように、ドリル１７４で既設穴１０１と同心状に削孔し、既設穴１０１より径が大きい削孔径で、既設穴１０１と同心状の新設穴１０４をコンクリート躯体１００に削孔する。図８（ｃ）において、Ｄ２’は新設穴１０４の径であり、新設穴１０４の径Ｄ２’＞既設穴１０１の径Ｄ１の関係になっている。 After that, as shown in FIG. 8C, a drill 174 is used to drill a hole concentrically with the existing hole 101, and a new hole 104 having a diameter larger than that of the existing hole 101 and concentric with the existing hole 101 is formed into a concrete skeleton. Drill to 100. In FIG. 8C, D2'is the diameter of the new hole 104, and the relationship is such that the diameter D2'of the new hole 104> the diameter D1 of the existing hole 101.

その後、図８（ｄ）に示すように、例えば特許文献３の部分拡径部削成ツールのような既存の部分拡径部削成ツール１７５を用い、既設穴１０１と同心状に、新設穴１０４の穴深さ方向の一部に部分拡径部１０５を形成し、既設穴１０１と同心状の部分拡径部１０５を有する新設穴１０４を形成する。図示例の部分拡径部１０５は、穴奥側に向かって漸次拡径する略テーパ形状で形成されている。図８（ｄ）において、Ｄ３は部分拡径部１０５の最大径であり、部分拡径部１０５の最大径Ｄ３＞新設穴１０４の径Ｄ２’の関係になっている。 After that, as shown in FIG. 8D, an existing partial diameter-expanded portion cutting tool 175 such as the partially-diameter-expanded portion cutting tool of Patent Document 3 is used, and a new hole is concentrically formed with the existing hole 101. A partial diameter-expanded portion 105 is formed in a part of the hole depth direction of the 104, and a new hole 104 having a partially-diameter-expanded portion 105 concentric with the existing hole 101 is formed. The partially enlarged diameter portion 105 in the illustrated example is formed in a substantially tapered shape in which the diameter is gradually increased toward the inner side of the hole. In FIG. 8D, D3 is the maximum diameter of the partially enlarged diameter portion 105, and the relationship is such that the maximum diameter D3 of the partially enlarged diameter portion 105> the diameter D2'of the new hole 104.

次いで、拡底式アンカーである新たな更新アンカー２０のアウター部材２１と軸体２２を軸体２２のテーパ部２２２を先端側に配置するようにして新設穴１０４に挿入する。そして、打込具１７６及びハンマー１７７を用いてアウター部材２１を穴奥側に打ち込み、軸体２２のテーパ部２２２をアウター部材２１の拡張片２１２側に相対的に圧入し、テーパ部２２２の圧入で拡張片２１２を拡張させて部分拡径部１０５に入り込ませ、更新アンカー２０を部分拡径部１０５を有する新設穴１０４に打設する（図８（ｅ）、（ｆ）参照）。 Next, the outer member 21 and the shaft body 22 of the new renewal anchor 20, which is a bottom-expanding anchor, are inserted into the new hole 104 so that the tapered portion 222 of the shaft body 22 is arranged on the tip side. Then, the outer member 21 is driven into the hole back side using the driving tool 176 and the hammer 177, the tapered portion 222 of the shaft body 22 is press-fitted relatively to the expansion piece 212 side of the outer member 21, and the tapered portion 222 is press-fitted. The expansion piece 212 is expanded and inserted into the partially expanded portion 105, and the renewal anchor 20 is driven into the new hole 104 having the partially expanded portion 105 (see FIGS. 8 (e) and 8 (f)).

その後、図８（ｆ）に示すように、コンクリート躯体１００の表面１０３から突出する更新アンカー２０の雄ねじ部２２３に取付物１５３を外挿し、取付物１５３の外側から雄ねじ部２２３にワッシャー１６５を外挿してナット１６６を螺合し、取付物１５３をコンクリート躯体１００に取り付ける。これにより、第２実施形態のコンクリート用アンカーの施工方法による元アンカー５０の更新アンカー２０への置き換え、取付物１５３の更新アンカー１０による取り付けが完了する。尚、取付物１５１と取付物１５３は同一物でも異なる物でも良い。 After that, as shown in FIG. 8 (f), the attachment 153 is externally inserted into the male thread portion 223 of the renewal anchor 20 protruding from the surface 103 of the concrete skeleton 100, and the washer 165 is removed from the outside of the attachment 153 to the male thread portion 223. Insert and screw the nut 166, and attach the attachment 153 to the concrete skeleton 100. As a result, the replacement of the original anchor 50 with the renewal anchor 20 by the construction method of the concrete anchor of the second embodiment and the attachment of the attachment 153 by the renewal anchor 10 are completed. The attachment 151 and the attachment 153 may be the same or different.

ところで先に述べた第１実施形態におけるスリーブ打込式アンカーの更新アンカー１０等のストレート穴に定着させるタイプのアンカーは、アンカー引抜方向に力が作用したときに、アンカー拡張部がコンクリートに対する摩擦力をもって抗しようとする。これに対して、拡底式アンカーの更新アンカー２０は、部分拡径部１０５で拡張片２１２が開いて入り込み、軸体２２に引抜方向の力が作用した時に、拡張した拡開片２１２から外側に向かってコンクリート躯体１００を押す方向に力が作用するため（図８（ｆ）、図９の太線矢印参照）、非常に大きな定着力を発現する。第２実施形態では、この押す方向の力が、元アンカー５０による応力負荷済領域Ｒ１と、応力負荷済領域Ｒ１の外側の引張応力がそれまで持続的に負荷されていない健全領域Ｒ３に対して作用して応力負荷済領域Ｒ１と健全領域Ｒ３が押圧される。そして、通常は、コンクリートが剪断破壊することなく、軸体２２の雄ねじ部２２３が切断するまで引抜力に耐えることが可能である。 By the way, in the type of anchor fixed to a straight hole such as the renewal anchor 10 of the sleeve driving type anchor in the first embodiment described above, when a force is applied in the anchor pulling direction, the anchor expansion portion has a frictional force against concrete. Try to resist with. On the other hand, in the renewal anchor 20 of the bottom expansion type anchor, when the expansion piece 212 opens and enters the partial diameter expansion portion 105 and a force in the pulling direction acts on the shaft body 22, the expansion piece 212 expands outward. Since the force acts in the direction of pushing the concrete skeleton 100 toward it (see the thick line arrow in FIG. 9 (f)), a very large fixing force is exhibited. In the second embodiment, the force in the pushing direction is applied to the stress-loaded region R1 by the original anchor 50 and the healthy region R3 to which the tensile stress outside the stress-loaded region R1 has not been continuously applied until then. By acting, the stress-loaded region R1 and the healthy region R3 are pressed. Then, normally, the concrete can withstand the pulling force until the male threaded portion 223 of the shaft body 22 is cut without shearing fracture.

第２実施形態のコンクリート用アンカーの施工方法によれば、また、既設穴１０１と同心状で、穴深さ方向の一部に部分拡径部１０５を形成した新設穴１０４に更新アンカー２０を打設することにより、元アンカー５０が引張応力を与えていた応力負荷済領域Ｒ１より外側のコンクリートの健全領域Ｒ３を利用して、更新アンカー２０を確実に効かせることができる。更に、既設穴１０１より径が大きい削孔径の新設穴１０４に更新アンカー２０を打設することにより、応力負荷済領域Ｒ１より外側のコンクリートの健全領域Ｒ３をより広範囲に利用して、更新アンカー２０をより確実に効かせることができる。 According to the method of constructing the concrete anchor of the second embodiment, the renewal anchor 20 is struck in the new hole 104 which is concentric with the existing hole 101 and has a partially enlarged diameter portion 105 formed in a part in the hole depth direction. By providing the renewal anchor 20, the renewal anchor 20 can be reliably applied by utilizing the sound region R3 of the concrete outside the stress-loaded region R1 to which the original anchor 50 has applied the tensile stress. Further, by driving the renewal anchor 20 into the new hole 104 having a drilling diameter larger than the existing hole 101, the renewal anchor 20 can be used more widely in the sound region R3 of the concrete outside the stress-loaded region R1. Can be used more reliably.

また、拡底式アンカーの更新アンカー２０は、新設穴１０４の部分拡径部１０５で拡張片２１２を開き、軸体２２に引抜方向の力が作用した時に、開いた拡張片２１２から外側に向けてコンクリートを押す方向に力が作用するため、非常に大きな定着力を発現し、更新アンカー２０の定着力、支持力をより高めることができる。その他、第２実施形態は第１実施形態と対応する構成から対応する効果を得ることができる。 Further, the renewal anchor 20 of the bottom-expanding anchor opens the expansion piece 212 at the partially enlarged diameter portion 105 of the new hole 104, and when a force in the pulling direction acts on the shaft body 22, the expansion piece 212 is directed outward from the opened expansion piece 212. Since the force acts in the direction of pushing the concrete, a very large fixing force can be exhibited, and the fixing force and the supporting force of the renewal anchor 20 can be further enhanced. In addition, the second embodiment can obtain the corresponding effect from the configuration corresponding to the first embodiment.

〔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 Scope of Inventions Disclosure of the Present Specification]
The invention disclosed in the present specification is specified by changing the partial contents thereof to other contents disclosed in the present specification to the extent applicable, in addition to the inventions listed as inventions and the embodiments. Or, those specified by adding other contents disclosed in the present specification to these contents, or those specified by deleting these partial contents to the extent that a partial effect can be obtained and making them into a higher concept. Including. The invention disclosed in the present specification also includes the following contents and modifications.

例えば第１実施形態では、既設穴１０１より径が大きい削孔径で、且つ既設穴１０１より深さが深い削孔深さで、既設穴１０１と同心状の新設穴１０２をコンクリート躯体１００に削孔し、この新設穴１０２に更新アンカー１０を打設する構成としたが、既設穴１０１より径が大きい削孔径で既設穴１０１と同心状の新設穴１０２をコンクリート躯体１００に削孔し、この新設穴１０２に更新アンカー１０を打設する構成、或いは既設穴１０１より深さが深い削孔深さで既設穴１０１と同心状の新設穴１０２をコンクリート躯体１００に削孔し、この新設穴１０２に更新アンカー１０を打設する構成としても良好であり、これにより、元アンカー５０による応力負荷済領域Ｒ１より外側のコンクリートの健全領域を利用して更新アンカー１０を確実に効かせることができる。 For example, in the first embodiment, a new hole 102 having a drilling diameter larger than that of the existing hole 101 and a drilling depth deeper than that of the existing hole 101 and concentric with the existing hole 101 is drilled in the concrete skeleton 100. Then, the renewal anchor 10 was placed in the new hole 102, but a new hole 102 having a hole diameter larger than that of the existing hole 101 and concentric with the existing hole 101 was drilled in the concrete skeleton 100, and this new hole was installed. A configuration in which an update anchor 10 is driven into the hole 102, or a new hole 102 having a drilling depth deeper than that of the existing hole 101 and concentric with the existing hole 101 is drilled in the concrete skeleton 100, and the new hole 102 is drilled. The configuration for placing the renewal anchor 10 is also good, and this makes it possible to ensure that the renewal anchor 10 is effective by utilizing the sound region of the concrete outside the stress-loaded region R1 by the original anchor 50.

また、第２実施形態では、穴深さ方向の一部に部分拡径部１０５を有する新設穴１０４を既設穴１０１より径が大きい削孔径で形成したが、既設穴１０１と同径の新設穴１０４の（即ち元の既設穴１０１をそのまま利用して）穴深さ方向の一部に部分拡径部１０５を形成し、この穴深さ方向の一部に部分拡径部１０５を有する既設穴１０１と同径の新設穴１０４に更新アンカー２０を打設する構成としても、第２実施形態と同様に更新アンカー２０を確実に効かせることができて良好である。また、穴深さ方向の一部に部分拡径部１０５を有する既設穴１０１と同径の新設穴１０４、或いは穴深さ方向の一部に部分拡径部１０５を有する既設穴１０１より大径の新設穴１０４を、既設穴１０１より深さが深い削孔深さで形成し、このように形成した新設穴１０４に更新アンカー２０を打設する構成としても、第２実施形態と同様に更新アンカー２０を確実に効かせることができて良好である。 Further, in the second embodiment, the new hole 104 having the partially enlarged diameter portion 105 in a part in the hole depth direction is formed with a drilling diameter larger than that of the existing hole 101, but the new hole has the same diameter as the existing hole 101. An existing hole having a partially enlarged diameter portion 105 formed in a part of 104 (that is, using the original existing hole 101 as it is) in the hole depth direction and having a partially enlarged diameter portion 105 in a part in the hole depth direction. Even in a configuration in which the renewal anchor 20 is driven into the new hole 104 having the same diameter as the 101, the renewal anchor 20 can be reliably applied as in the second embodiment, which is good. Further, the diameter is larger than the new hole 104 having the same diameter as the existing hole 101 having a partially enlarged diameter portion 105 in a part in the hole depth direction, or the existing hole 101 having a partially enlarged diameter portion 105 in a part in the hole depth direction. The new hole 104 is formed at a drilling depth deeper than the existing hole 101, and the update anchor 20 is driven into the newly formed hole 104 formed in this way, as in the second embodiment. It is good that the anchor 20 can be surely worked.

また、本発明における元アンカー、更新アンカーは、それぞれ本発明を適用可能な範囲で適宜であり、本体打込式アンカー以外の元アンカーに対しても本発明は適用可能であり、又、スリーブ打込式アンカー、拡底式アンカー以外の更新アンカーに対しても本発明は適用可能である。例えば本体打込式アンカーの元アンカーを本体打込式アンカーの更新アンカーに置き換える場合にも本発明を適用することが可能である。 Further, the original anchor and the renewal anchor in the present invention are appropriate to the extent to which the present invention can be applied, and the present invention can be applied to original anchors other than the main body driving type anchor, and the sleeve driving The present invention is also applicable to renewal anchors other than the built-in anchor and the bottom-expanded anchor. For example, the present invention can be applied even when the original anchor of the main body driving anchor is replaced with the renewal anchor of the main body driving anchor.

本発明は、コンクリート躯体に設置された既存のアンカーを取り外し、新たなアンカーに置き換える際に利用することができる。 The present invention can be used when removing an existing anchor installed on a concrete skeleton and replacing it with a new anchor.

１０、Ｐ１’、Ｐ２’、Ｐ３’…更新アンカー １１…スリーブ １１１…スリット １１２…拡張片 １１３…凹凸 １１４…後部 １２…インナー部材 １２１…基部 １２２…テーパ部 １２３…雌ねじ １３…取付ボルト ２０…更新アンカー ２１…アウター部材 ２１１…スリット ２１２…拡張片 ２１３…基筒 ２１４…薄肉部 ２２…軸体 ２２１…基部 ２２２…テーパ部 ２２３…雄ねじ部 ２２４…打込マーク ５０、Ｐ１、Ｐ２、Ｐ３…元アンカー ５１…本体 ５１１…雌ねじ ５１２…スリット ５１３…拡開片 ５１４…凹凸 ５２…コーン ５２１…基部 ５２２…テーパ部 ５３…取付ボルト １００…コンクリート躯体 １０１…既設穴 １０２…新設穴 １０３…表面 １０４…新設穴 １０５…部分拡径部 １５１、１５２、１５３…取付物 １６１、１６３、１６５…ワッシャー １６２、１６４、１６６…ナット １７１、１７４…ドリル １７２、１７６…打込具 １７３、１７７…ハンマー １７５…部分拡径部削成ツール ３００…コンクリート躯体 ３０１…既設穴 ３０２…モルタル ３０３…新設穴 Ｄ１…既設穴の径、Ｌ１…既設穴の深さ Ｄ２、Ｄ２’…新設穴の径 Ｌ２…新設穴の深さ Ｄ３…部分拡径部の最大径 α１…元アンカーの破壊想定面の傾斜角度 Ｓ１…破壊想定面 Ｒ１…応力負荷済領域 α２…更新アンカーの破壊想定面の傾斜角度 Ｓ２…破壊想定面 Ｒ２…健全領域 Ｒ３…押圧される健全領域 Ｓ１０…破壊想定面 Ｒ１０…応力負荷済領域
10, P1', P2', P3'... Update anchor 11 ... Sleeve 111 ... Slit 112 ... Expansion piece 113 ... Unevenness 114 ... Rear 12 ... Inner member 121 ... Base 122 ... Tapered part 123 ... Female screw 13 ... Mounting bolt 20 ... Update Anchor 21 ... Outer member 211 ... Slit 212 ... Expansion piece 213 ... Base cylinder 214 ... Thin-walled part 22 ... Shaft body 221 ... Base part 222 ... Taper part 223 ... Male screw part 224 ... Driving mark 50, P1, P2, P3 ... Original anchor 51 ... Main body 511 ... Female screw 512 ... Slit 513 ... Expansion piece 514 ... Concavo-convex 52 ... Cone 521 ... Base 522 ... Tapered part 53 ... Mounting bolt 100 ... Concrete skeleton 101 ... Existing hole 102 ... New hole 103 ... Surface 104 ... New hole 105 ... Partial diameter expansion part 151, 152, 153 ... Attachment 161, 163, 165 ... Washer 162, 164, 166 ... Nut 171, 174 ... Drill 172, 176 ... Driving tool 173, 177 ... Hammer 175 ... Partial diameter expansion Part cutting tool 300 ... Concrete skeleton 301 ... Existing hole 302 ... Mortal 303 ... New hole D1 ... Existing hole diameter, L1 ... Existing hole depth D2, D2'... New hole diameter L2 ... New hole depth D3 … Maximum diameter of the partially expanded part α1… Inclination angle of the assumed fracture surface of the original anchor S1… Assumed fracture surface R1… Stress-loaded area α2… Inclination angle of the assumed fracture surface of the updated anchor S2… Assumed fracture surface R2… Healthy area R3 ... Sound area to be pressed S10 ... Assumed failure surface R10 ... Stress loaded area

Claims (7)

コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、
前記既設穴と同心状に、前記既設穴より径が大きい削孔径で新設穴を削孔する第２工程と、
前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とするコンクリート用アンカーの施工方法。 The first step of removing the existing original anchor from the existing hole in the concrete skeleton,
The second step of drilling a new hole concentrically with the existing hole with a drilling diameter larger than that of the existing hole.
A method for constructing an anchor for concrete, which comprises a third step of placing a new renewal anchor in the new hole. 前記第２工程において、前記既設穴より深さが深い削孔深さで前記新設穴を削孔することを特徴とする請求項１記載のコンクリート用アンカーの施工方法。 The method for constructing an anchor for concrete according to claim 1, wherein in the second step, the new hole is drilled at a drilling depth deeper than the existing hole. コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、
前記既設穴と同心状に、前記既設穴より深さが深い削孔深さで新設穴を削孔する第２工程と、
前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とするコンクリート用アンカーの施工方法。 The first step of removing the existing original anchor from the existing hole in the concrete skeleton,
The second step of drilling a new hole concentrically with the existing hole at a drilling depth deeper than that of the existing hole.
A method for constructing an anchor for concrete, which comprises a third step of placing a new renewal anchor in the new hole. 前記元アンカーが、内周に取付ボルトが螺合される雌ねじが形成され且つ先端側に拡開片が形成された本体と、先端側から本体側に圧入されて前記拡開片を拡開するコーンから構成される本体打込式アンカーであり、
前記更新アンカーが、基部の先端側に先端に向かって漸次拡径するテーパ部が設けられ且つ前記基部の内周に取付ボルトが螺合される雌ねじが形成されたインナー部材と、先端側に前記テーパ部の圧入で拡張する拡張片が設けられたスリーブから構成されるスリーブ打込式アンカーであることを特徴とする請求項１〜３の何れかに記載のコンクリート用アンカーの施工方法。 The original anchor is press-fitted from the tip side to the main body side to expand the main body and the main body having a female screw into which a mounting bolt is screwed on the inner circumference and an expansion piece formed on the tip side. It is a body-driven anchor composed of cones.
The renewal anchor has an inner member having a tapered portion on the tip end side of the base that gradually expands in diameter toward the tip and a female screw on the inner circumference of the base to which a mounting bolt is screwed, and the tip end side. The method for constructing an anchor for concrete according to any one of claims 1 to 3, wherein the anchor is a sleeve-driving type anchor composed of a sleeve provided with an expansion piece that expands by press-fitting the tapered portion. コンクリート躯体の既設穴から既存の元アンカーを抜き取る第１工程と、
前記既設穴と同心状に、穴深さ方向の一部に部分拡径部を形成して新設穴を削孔する第２工程と、
前記部分拡径部に拡張した拡張片を入り込ませるようにして前記新設穴に新たな更新アンカーを打設する第３工程を備えることを特徴とするコンクリート用アンカーの施工方法。 The first step of removing the existing original anchor from the existing hole in the concrete skeleton,
The second step of forming a partially enlarged diameter portion in a part in the hole depth direction concentrically with the existing hole and drilling a new hole.
A method for constructing an anchor for concrete, which comprises a third step of driving a new renewal anchor into the new hole so that an expanded piece is inserted into the partially enlarged diameter portion. 前記第２工程において、前記既設穴より径が大きい削孔径で前記新設穴を削孔する、若しくは前記既設穴より深さが深い削孔深さで前記新設穴を削孔する、若しくは前記既設穴より径が大きい削孔径で且つ前記既設穴より深さが深い削孔深さで前記新設穴を削孔することを特徴とする請求項５記載のコンクリート用アンカーの施工方法。 In the second step, the new hole is drilled with a drilling diameter larger than the existing hole, or the new hole is drilled with a drilling depth deeper than the existing hole, or the existing hole is drilled. The method for constructing an anchor for concrete according to claim 5, wherein the new hole is drilled with a drilling diameter having a larger diameter and a drilling depth deeper than that of the existing hole. 前記元アンカーが、内周に取付ボルトが螺合される雌ねじが形成され且つ先端側に拡張片が形成された本体と、前記本体の打込みにより本体側に圧入されたコーンから構成される本体打込式アンカーであり、
前記更新アンカーが、基部の先端側に先端に向かって漸次拡径するテーパ部が設けられ且つ前記基部の後端側に雄ねじ部が設けられている軸体と、基筒の先端側に薄肉部を介して前記テーパ部の圧入で拡張する拡張片が設けられたアウター部材から構成される拡底式アンカーであることを特徴とする請求項５又は６記載のコンクリート用アンカーの施工方法。
The original anchor is a main body striking composed of a main body in which a female screw into which a mounting bolt is screwed on the inner circumference is formed and an expansion piece is formed on the tip side, and a cone press-fitted into the main body side by driving the main body. It is a built-in anchor and
The renewal anchor has a shaft body provided with a tapered portion whose diameter gradually increases toward the tip on the tip end side of the base portion and a male screw portion provided on the rear end side of the base portion, and a thin portion on the tip end side of the base cylinder. The method for constructing a concrete anchor according to claim 5 or 6, wherein the bottom-expanding anchor is composed of an outer member provided with an expansion piece that expands by press-fitting the tapered portion.
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