JP5568075B2 - Post-installed anchor method - Google Patents

Post-installed anchor method Download PDF

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JP5568075B2
JP5568075B2 JP2011263629A JP2011263629A JP5568075B2 JP 5568075 B2 JP5568075 B2 JP 5568075B2 JP 2011263629 A JP2011263629 A JP 2011263629A JP 2011263629 A JP2011263629 A JP 2011263629A JP 5568075 B2 JP5568075 B2 JP 5568075B2
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anchor
hole
tip
post
center
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JP2013117087A (en
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雄大 鈴木
薫 小林
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East Japan Railway Co
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East Japan Railway Co
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Description

本発明はアンカー筋を削孔した孔の中心にセットし、保持固定することができる後施工アンカー工法に関する。   The present invention relates to a post-installed anchor construction method in which an anchor bar can be set and held and fixed at the center of a drilled hole.

図１０は接着系後施工アンカーの施工手順を説明する図（横向き施工の例）で、図１０（Ａ）は横断面図、図１０（Ｂ）は正面図であり、図１０（ａ）〜図１０（ｄ）は施工手順を示している。
既設コンクリート構造物等の母材１にアンカーを施工する場合（図１０（ａ））、母材１に所定深さに削孔した孔２を形成し（図１０（ｂ））、この孔にアンカー筋３を挿入し（図１０（ｃ））、孔に充填材４を充填する（図１０（ｄ））。充填材はアンカー筋挿入前にあらかじめ入れておいてもよいし、アンカー筋挿入後に注入してもよい。こうして削孔した孔の中の充填材が硬化すると施工完了となる。 10A and 10B are diagrams for explaining the construction procedure of the post-bonding anchor (an example of lateral construction). FIG. 10A is a cross-sectional view, FIG. 10B is a front view, and FIG. FIG. 10D shows a construction procedure.
When an anchor is to be constructed on the base material 1 such as an existing concrete structure (FIG. 10 (a)), a hole 2 drilled to a predetermined depth is formed in the base material 1 (FIG. 10 (b)). The anchor muscle 3 is inserted (FIG. 10C), and the filler 4 is filled in the hole (FIG. 10D). The filler may be put in advance before the anchor muscle is inserted, or may be injected after the anchor muscle is inserted. When the filler in the hole thus drilled is hardened, the construction is completed.

図１１は従来の接着系後施工アンカーの施工上の課題を説明する図である。
図１１（ａ）はアンカー筋３が孔２の下側に落ちた場合を示しており、アンカー筋３の下側は充填材の付着が少なく十分な強度がとれなくなってしまう。
図１１（ｂ）はアンカー筋３が孔２に斜めにセットされた場合を示している。この場合も、アンカー筋の強度が最大限発揮されないことがある。
このようにアンカー筋を削孔した孔の中心にセットして保持することが難しかった。そのため、従来は、アンカー筋を設置するために手で支えたり、器具等を使用しているが、手間とコストがかかってしまっていた。 FIG. 11 is a diagram for explaining a problem in construction of a conventional adhesive post-construction anchor.
FIG. 11A shows a case where the anchor bar 3 falls to the lower side of the hole 2, and the lower side of the anchor bar 3 has little adhesion of the filler, and sufficient strength cannot be obtained.
FIG. 11 (b) shows a case where the anchor muscle 3 is set obliquely in the hole 2. In this case as well, the strength of the anchor muscle may not be fully demonstrated.
Thus, it was difficult to set and hold the anchor bar at the center of the drilled hole. For this reason, conventionally, in order to install the anchor muscle, it is supported by a hand or using an instrument or the like, but it has been troublesome and costly.

本発明は上記課題を解決しようとするもので、手で支えたり、器具等を使用することなくアンカー筋を孔の中心にセットし、保持することができる後施工アンカー工法を提供することを目的とする。
本発明は、母材の表面から削孔した孔にアンカー筋を挿入して充填材で固定する後施工アンカー工法において、孔先端部に小径の孔を形成するとともに、アンカー筋先端部をアンカー筋本体より細く形成し、アンカー筋先端部を孔先端部の小径の孔に嵌合させてアンカー筋を孔中心に誘導して固定することを特徴とする。
また、本発明は、アンカー筋先端部がアンカー筋本体と一体またはアンカー筋本体に接続される構造であることを特徴とする。
また、本発明は、アンカー筋先端部にアンカー筋挿入に伴って楔効果で拡大する拡張部を形成し、拡張部が孔先端部の壁面に圧接されることを特徴とする。
また、本発明は、アンカー筋先端部が接着材により前記小径の孔に固定されるとことを特徴とする。
また、本発明は、前記小径の孔がアンカー筋先端部を孔中心に誘導するテーパー部を有していることを特徴とする。
また、本発明は、アンカー筋に充填材が漏れ出すのを防ぐ部材が取り付けられていることを特徴とする。
An object of the present invention is to provide a post-installed anchor method capable of setting and holding an anchor muscle at the center of a hole without supporting by hand or using an instrument or the like. And
The present invention provides a post-construction anchor method in which an anchor bar is inserted into a hole drilled from the surface of a base material and fixed with a filler, and a small-diameter hole is formed at the hole tip, and the anchor bar tip is anchored to the anchor bar. It is narrower than the main body, and the anchor muscle tip is fitted into a small-diameter hole at the hole tip so that the anchor muscle is guided and fixed at the hole center.
Further, the present invention is characterized in that the tip of the anchor muscle is integrated with the anchor muscle main body or connected to the anchor muscle main body.
Further, the present invention is characterized in that an extended portion that expands by a wedge effect as the anchor muscle is inserted is formed at the distal end portion of the anchor muscle, and the expanded portion is pressed against the wall surface of the hole distal end portion.
Further, the present invention is characterized in that an anchor muscle tip portion is fixed to the small-diameter hole by an adhesive.
Further, the present invention is characterized in that the small-diameter hole has a tapered portion that guides the tip end portion of the anchor muscle to the hole center.
Further, the present invention is characterized in that a member for preventing the filler from leaking to the anchor bar is attached.

本発明は、アンカー筋を削孔した孔に挿入すると、アンカー筋の先端部が孔中心に誘導されて孔に嵌合し、中心に保持されるため、手で支えたり、器具等を使用することなくアンカー筋を孔の中心にセットし保持することが可能となる。   In the present invention, when the anchor bar is inserted into the drilled hole, the tip of the anchor bar is guided to the hole center and fits into the hole, and is held at the center. The anchor muscle can be set and held at the center of the hole without any problem.

アンカー筋の先端を孔の中心に誘導する例を説明する図である。It is a figure explaining the example which guide | induces the front-end | tip of an anchor muscle to the center of a hole. アンカー筋の先端を孔の中心に誘導する他の例を説明する図である。It is a figure explaining the other example which guide | induces the front-end | tip of an anchor muscle to the center of a hole. アンカー筋の先端を孔の中心に保持する例の概念図である。It is a conceptual diagram of the example which hold | maintains the front-end | tip of an anchor muscle at the center of a hole. アンカー筋を孔中心にセットして保持する構成例を説明する図である。It is a figure explaining the structural example which sets and hold | maintains an anchor muscle in the hole center. 先端固定部を押し込んでアンカー筋を孔に固定する例を説明する図である。It is a figure explaining the example which pushes in a front-end | tip fixing | fixed part and fixes an anchor muscle to a hole. 接着材によりアンカー筋を固定する例を説明する図である。It is a figure explaining the example which fixes an anchor muscle with an adhesive material. アンカー筋が細い場合の固定方法を説明する図である。It is a figure explaining the fixing method when an anchor muscle is thin. 本発明のアンカー施工手順を説明する図である。It is a figure explaining the anchor construction procedure of this invention. 本発明の横向き施工と上向き施工の説明図である。It is explanatory drawing of the sideways construction and upward construction of this invention. 接着系後施工アンカーの施工手順を説明する図である。It is a figure explaining the construction procedure of an adhesion type post-construction anchor. 従来の接着系後施工アンカーの施工上の課題を説明する図である。It is a figure explaining the subject on the construction of the conventional adhesion system post-construction anchor.

以下、本実施形態について説明する。
図１はアンカー筋の先端を孔の中心に誘導する例を説明する図である。
図１（ａ）は、構造物母材１に削孔された孔２に挿入されるアンカー筋３の先端に尖塔状の先細部３１が形成され、図１（ｂ）はアンカー筋３の先端に球面状の先細部３３が形成され、これら先細部３１、３３が孔２の先端中心に設けたガイド用の小径の孔２１に嵌合するようになっており、アンカー筋３を孔２に挿入するだけでアンカー筋の先端が自動的に孔の中心に誘導されてセットされる。充填材４はアンカー筋挿入前、或いは挿入後に注入され、この硬化により施工完了となる。 Hereinafter, this embodiment will be described.
FIG. 1 is a diagram illustrating an example in which the tip of an anchor muscle is guided to the center of a hole.
In FIG. 1A, a spire-like tapered detail 31 is formed at the tip of the anchor muscle 3 inserted into the hole 2 drilled in the structure base material 1, and FIG. Spherical tapered details 33 are formed on the inner surface of the hole 2, and the tapered details 31, 33 are fitted into a small diameter guide hole 21 provided at the center of the tip of the hole 2. Just by inserting, the tip of the anchor muscle is automatically guided to the center of the hole and set. The filler 4 is injected before or after insertion of the anchor muscle, and the construction is completed by this hardening.

図２はアンカー筋の先端を孔の中心に誘導する他の例を説明する図である。この例は削孔した孔の先端部にテーパー部を有する小径の孔を形成し、テーパー部によりアンカー筋の先端を孔の中心に誘導するものである。
アンカー筋は、アンカー筋本体３３の先端部に開けた嵌合穴に本体より細い先端誘導部３５が接続された構造をしていて、先端誘導部３５はその先端部３７の中央部にその先端側から穴が形成された筒状体となっており、筒状体の開口部には楔４０の尖った部分を嵌合させている。楔４０は円錐状、角錐状等で筒状体の開口形状に合う形状のものであればよい。一方、削孔した孔２の先端には、徐々に径が細くなるテーパー部２７を有する小径の孔２５が形成されている。アンカー筋を挿入していくと、筒状体の先端誘導部３５に嵌合した楔４０が、小径の孔２５のテーパー部２７の斜壁に沿って矢印に示すように孔の中心に誘導される（図２（ａ））。さらに、アンカー筋を挿入して楔４０が孔の底面に到達した状態でアンカー筋本体３３を押し込んでいくと、楔４０の先端が筒状体である先端誘導部３５の開口部に食い込んで先端部３７が押し広げられて小径の孔２５の壁面に圧接して固定される（図２（ｂ））。 FIG. 2 is a diagram illustrating another example in which the tip of the anchor muscle is guided to the center of the hole. In this example, a small-diameter hole having a tapered portion is formed at the tip of the drilled hole, and the tip of the anchor bar is guided to the center of the hole by the tapered portion.
The anchor muscle has a structure in which a tip guide portion 35 narrower than the main body is connected to a fitting hole formed in the tip portion of the anchor muscle main body 33, and the tip guide portion 35 has a tip at the center of the tip portion 37. A cylindrical body is formed with a hole from the side, and a sharp portion of the wedge 40 is fitted into the opening of the cylindrical body. The wedge 40 only needs to have a conical shape, a pyramid shape, or the like that matches the opening shape of the cylindrical body. On the other hand, a small-diameter hole 25 having a tapered portion 27 whose diameter gradually decreases is formed at the tip of the drilled hole 2. As the anchor muscles are inserted, the wedge 40 fitted to the distal end guiding portion 35 of the cylindrical body is guided to the center of the hole as indicated by the arrow along the inclined wall of the tapered portion 27 of the small diameter hole 25. (FIG. 2A). Further, when the anchor muscle is inserted and the anchor muscle main body 33 is pushed in with the wedge 40 reaching the bottom surface of the hole, the tip of the wedge 40 bites into the opening of the tip guide portion 35 which is a cylindrical body. The portion 37 is spread and pressed against the wall surface of the small-diameter hole 25 (FIG. 2B).

図３はアンカー筋の先端を孔の中心にセットして保持する例の概念図である。
図３（ａ）は構造物母材１に削孔された孔２（図１又は図２に示した先端部を有する孔）に挿入されるアンカー筋３が所定の太さを有しており、その先端部にアンカー筋を孔の中心に保持する機構５５を設けて孔の先端に設けた小径の孔に嵌合させるものであり、アンカー筋３を孔２に押し込むことで孔の中心に保持される。
図３（ｂ）はアンカー筋３が細く孔も小径のため、先端に小径の孔を開けられない場合の例であり、孔２の先端部に受け金具５０を設け、受け金具５０でアンカー筋３の先端部５７を孔の中心に保持する。
このようにアンカー筋３は手を放しても孔の中心に保持固定される。充填材４はアンカー筋挿入前、或いは挿入後に注入される。 FIG. 3 is a conceptual diagram of an example in which the tip of the anchor muscle is set and held at the center of the hole.
FIG. 3 (a) shows that an anchor bar 3 inserted into a hole 2 (a hole having a tip portion shown in FIG. 1 or 2) drilled in the structure base material 1 has a predetermined thickness. A mechanism 55 for holding the anchor muscle at the center of the hole is provided at the tip of the hole to be fitted into a small diameter hole provided at the tip of the hole. Retained.
FIG. 3B shows an example in which the anchor bar 3 is thin and the hole has a small diameter so that a small-diameter hole cannot be formed at the tip. A receiving metal fitting 50 is provided at the tip of the hole 2. 3 tip 57 is held in the center of the hole.
In this way, the anchor muscle 3 is held and fixed at the center of the hole even if the hand is released. The filler 4 is injected before or after insertion of the anchor muscle.

次に、図４〜図７によりアンカー筋を孔の中心にセットして保持する構成について説明する。
図４はアンカー筋を孔の中心にセットし保持する機構の製作例を説明する図である。
図４（ａ）はアンカー筋の先端側中心部を残して破線部１１０を切削することでアンカー筋本体１００と本体より細い先端固定部１２０とを一体に製作する方法である。
図４（ｂ）はアンカー筋本体１００と本体より細い先端固定部１２０とを分離して製作し、アンカー筋本体１００の先端側中心部に形成した穴１１５に先端固定部１２０の接続部１２５を挿入して接続する方法である。
いずれの場合にも、後述するように先端固定部１２０がアンカー筋を孔（図１又は図２に示した先端部を有する孔）の中心にセットして保持固定する機能を果たす。 Next, a configuration in which the anchor muscle is set and held at the center of the hole will be described with reference to FIGS.
FIG. 4 is a view for explaining a manufacturing example of a mechanism for setting and holding the anchor muscle at the center of the hole.
FIG. 4A shows a method of integrally manufacturing the anchor muscle main body 100 and the tip fixing portion 120 thinner than the main body by cutting the broken line portion 110 while leaving the center portion on the distal end side of the anchor muscle.
4B, the anchor muscle main body 100 and the tip fixing portion 120 thinner than the main body are separately manufactured, and the connecting portion 125 of the tip fixing portion 120 is formed in the hole 115 formed in the center portion on the tip end side of the anchor muscle main body 100. It is a method of inserting and connecting.
In any case, as will be described later, the tip fixing portion 120 functions to set and hold the anchor muscle at the center of the hole (the hole having the tip shown in FIG. 1 or 2).

図５は分離した先端固定部を押し込んで孔に固定する方法を説明する図である。
アンカー筋本体への接続部１２５を有する先端固定部１３０は、中央部に先端側から穴１３５が形成された筒状体であり、その先端部１３７の開口部には楔１５０の尖った部分を嵌合させ、先端固定部１３０を矢印Ａで示すように削孔した孔２００の先端側ガイド用の小径部２１０（図１又は図２に示した孔の先端部）に押し込む（図５（ａ））。楔１５０は円錐状、角錐状等で筒状体の開口形状に合う形状のものであればよい。先端固定部１３０を押し込んでいき、楔１５０がガイド用の小径部２１０の底部に達するまで押し込むと、筒状体の先端部１３７は開口部に食い込んでくる楔１５０により押し拡げられて小径部２１０の壁面に圧接して固定される（図５（ｂ））。この状態で、接続部１２５にアンカー筋本体１００を矢印Ｂで示すように押し込んで固定することにより、アンカー筋全体が孔２００の中心に誘導されて保持固定される（図５（ｃ））。なお、先端固定部１３０の先端部１３７は、二股、四股等に分かれた構造としてもよい。アンカー筋本体と先端部はあらかじめ一体化していてもよい。 FIG. 5 is a diagram for explaining a method of pressing the separated tip fixing portion and fixing it to the hole.
The distal end fixing portion 130 having the connection portion 125 to the anchor muscle main body is a cylindrical body in which a hole 135 is formed in the central portion from the distal end side, and a sharp portion of the wedge 150 is formed at the opening portion of the distal end portion 137. The distal end fixing portion 130 is pushed into the small diameter portion 210 for guiding the distal end side of the hole 200 that has been drilled as indicated by arrow A (the distal end portion of the hole shown in FIG. 1 or FIG. 2). )). The wedge 150 may have a conical shape, a pyramid shape, or the like that matches the opening shape of the cylindrical body. When the distal end fixing portion 130 is pushed in and pushed until the wedge 150 reaches the bottom of the small diameter portion 210 for guide, the distal end portion 137 of the cylindrical body is pushed and expanded by the wedge 150 that bites into the opening. And fixed to the wall surface (FIG. 5B). In this state, the anchor bar main body 100 is pushed into and fixed to the connecting portion 125 as indicated by an arrow B, whereby the entire anchor bar is guided and held and fixed at the center of the hole 200 (FIG. 5C). Note that the distal end portion 137 of the distal end fixing portion 130 may be divided into two forks, four forks, and the like. The anchor muscle main body and the tip may be integrated in advance.

図６は接着材によりアンカー筋を固定する例を説明する図である。
この例は、アンカー筋本体と細い先端固定部とが一体の場合であり、削孔した孔２００の先端中心にはガイド用の小径部２１０が形成されていて、ここにアンカー筋本体１００と一体の先端固定部１２０を差し込んでいく。先端固定部１２０の周面には樹脂系等の接着材１４０が塗布されており（図６（ａ））、矢印Ｃで示すように先端固定部１２０の先端が小径部２１０（図１又は図２に示した孔の先端部）の底面に達するまでアンカー筋本体１００を差し込み、ガイド用小径部２１０と先端固定部１２０とを固定する。こうして、アンカー筋全体が孔２００の中心に誘導されて保持固定される。なお、接着材で固定する方法はアンカー筋本体と先端固定部とが分離型の場合でも適用可能であり、また、接着材により固定する方法と、図２、図５に示したような楔効果により壁面を圧接する固定方法とを併用するようにしてもよい。 FIG. 6 is a diagram for explaining an example in which anchor bars are fixed by an adhesive.
In this example, the anchor muscle main body and the thin tip fixing portion are integrated, and a small-diameter portion 210 for guide is formed at the center of the tip of the drilled hole 200, and is integrated with the anchor muscle main body 100 here. The tip fixing part 120 is inserted. A resin-based adhesive 140 is applied to the peripheral surface of the tip fixing portion 120 (FIG. 6A), and as shown by an arrow C, the tip of the tip fixing portion 120 has a small diameter portion 210 (FIG. 1 or FIG. 1). The anchor muscle main body 100 is inserted until the bottom surface of the hole shown in Fig. 2 is reached, and the guide small diameter portion 210 and the tip fixing portion 120 are fixed. In this way, the entire anchor muscle is guided and held and fixed at the center of the hole 200. Note that the method of fixing with an adhesive is applicable even when the anchor muscle main body and the tip fixing portion are separated, and the method of fixing with an adhesive and the wedge effect as shown in FIGS. Thus, a fixing method of pressing the wall surface may be used in combination.

図７はアンカー筋が細く、先端にガイド用小径部を開けられない場合の固定方法を説明する図である。
この例では、削孔した孔２００は先端まで同じ径であり、アンカー筋本体１００の先端には、中心部に先端側から穴を形成した筒状の先端固定部１６０を固定する。先端固定部１６０の先端部１６５の開口部には楔１７０の尖った部分を嵌合させ、アンカー筋本体１００を矢印Ｄに示すように孔２００に押し込む（図７（ａ））。楔１７０が孔の底部に達するまで押し込んでいくと、筒状体の先端部１６５は開口部に食い込んでくる楔１７０により押し拡げられて孔２００に圧接して固定される（図７（ｂ））。こうしてアンカー筋は孔２００の中心に誘導されて保持固定される。なお、先端固定部１６０の先端部１６５は、二股、四股等に分離した構成とするようにしてもよい。また、図７（ｃ）に示すように、先端固定部１６０と楔１７０とは逆向きの関係でもよく、先端固定部を先端が尖った楔１８０とし、この楔を受け入れる座金１９０を開口を上に向けた筒状体１９０とし、楔１８０により筒状体１９０の先端部１９５を押し拡げて孔の壁面に固定するようにしてもよい。また、接着材により先端固定部を固定する方法と併用してもよい。 FIG. 7 is a view for explaining a fixing method when the anchor bar is thin and the small diameter guide portion cannot be opened at the tip.
In this example, the drilled hole 200 has the same diameter up to the tip, and a cylindrical tip fixing portion 160 having a hole formed in the center portion from the tip side is fixed to the tip of the anchor muscle main body 100. The sharpened portion of the wedge 170 is fitted into the opening of the distal end portion 165 of the distal end fixing portion 160, and the anchor muscle main body 100 is pushed into the hole 200 as shown by the arrow D (FIG. 7A). When the wedge 170 is pushed in until it reaches the bottom of the hole, the distal end portion 165 of the cylindrical body is expanded by the wedge 170 that bites into the opening, and is fixed in pressure contact with the hole 200 (FIG. 7B). ). In this way, the anchor muscle is guided and held and fixed at the center of the hole 200. Note that the distal end portion 165 of the distal end fixing portion 160 may be configured to be separated into two forks, four forks, and the like. Further, as shown in FIG. 7 (c), the tip fixing portion 160 and the wedge 170 may be in an opposite direction. The tip fixing portion is a wedge 180 having a sharp tip, and a washer 190 for receiving the wedge is opened upward. It is also possible that the cylindrical body 190 is directed toward the end, and the distal end portion 195 of the cylindrical body 190 is pushed and expanded by the wedge 180 and fixed to the wall surface of the hole. Moreover, you may use together with the method of fixing a front-end | tip fixing | fixed part with an adhesive material.

図８は本発明のアンカー施工手順を説明する図（横向き施工の例）で、図８（Ａ）は横断面図、図８（Ｂ）は正面図で、図８（ａ）〜図８（ｄ）は施工手順を示している。
既設コンクリート構造物等の母材１に後施工アンカーを施工する場合（図８（ａ））、母材１に所定深さの孔２を削孔し（図８（ｂ））、アンカー筋３を挿入すると、アンカー筋３は孔２の中心に誘導されて保持固定される（図８（ｃ））。次いで、孔の中に充填材４を充填し（図８（ｄ））、充填材が硬化すると施工完了となる。なお、充填材はアンカー筋挿入前に注入しておいてもよい。
図９は後施工アンカーを横向き施工する場合（図９（ａ））、後施工アンカーを上向き施工する場合（図９（ｂ））を示している。
本発明では、施工向きに寄らずにアンカー筋３が孔２の中心に誘導されて保持固定されるため、充填材の施工が容易になり、また、スペーサー等を設けてセンターリングする必要がなく、手間とコストをかけずに容易にアンカー筋を孔の中心にセットすることが可能となる。
なお、上記の各例において、アンカー筋に充填材が漏れ出すの防ぐ蓋（型枠）などを取り付けるようにしてもよい。横向きや上向きでの施工時には、充填材が漏れ出す恐れがあるが、漏れ出し防止の蓋（型枠）をアンカー筋に取り付けることでこれを防ぐことが可能となり、仕上がりをきれいにすることが可能となる。 FIG. 8 is a diagram for explaining the anchor construction procedure of the present invention (an example of lateral construction). FIG. 8 (A) is a cross-sectional view, FIG. 8 (B) is a front view, and FIG. d) shows the construction procedure.
When a post-construction anchor is to be constructed on the base material 1 such as an existing concrete structure (FIG. 8 (a)), a hole 2 of a predetermined depth is drilled in the base material 1 (FIG. 8 (b)), and the anchor bar 3 When is inserted, the anchor muscle 3 is guided and held and fixed at the center of the hole 2 (FIG. 8C). Next, the filler 4 is filled into the holes (FIG. 8D), and the construction is completed when the filler is cured. The filler may be injected before inserting the anchor muscle.
FIG. 9 shows the case where the post-construction anchor is constructed sideways (FIG. 9 (a)), and the case where the post-construction anchor is constructed upward (FIG. 9 (b)).
In the present invention, since the anchor bar 3 is guided and held and fixed at the center of the hole 2 without depending on the construction direction, the construction of the filler is facilitated, and there is no need to provide a spacer or the like for centering. The anchor muscle can be easily set at the center of the hole without labor and cost.
In each of the above examples, a lid (form) that prevents the filler from leaking out to the anchor bars may be attached. There is a risk that the filler may leak out during construction in the sideways or upward direction, but this can be prevented by attaching a lid (form) to prevent leakage, and the finish can be cleaned. Become.

１…構造物母材、２…削孔した孔、３…アンカー筋、４…充填材、２１…小径の孔、３１，３３…先細部。   DESCRIPTION OF SYMBOLS 1 ... Structure base material, 2 ... Drilled hole, 3 ... Anchor reinforcement, 4 ... Filler, 21 ... Small-diameter hole, 31, 33 ... Tip.

Claims (6)

母材の表面から削孔した孔にアンカー筋を挿入して充填材で固定する後施工アンカー工法において、孔先端部に小径の孔を形成するとともに、アンカー筋先端部をアンカー筋本体より細く形成し、アンカー筋先端部を孔先端部の小径の孔に嵌合させてアンカー筋を孔中心に誘導して固定することを特徴とする後施工アンカー工法。 In the post-installed anchor method, in which anchor bars are inserted into holes drilled from the surface of the base material and fixed with filler , a small-diameter hole is formed at the hole tip and the anchor bar tip is made narrower than the anchor bar body. A post-installed anchor method characterized in that the anchor bar tip is fitted into a small-diameter hole at the hole tip and the anchor bar is guided and fixed to the hole center. アンカー筋先端部がアンカー筋本体と一体またはアンカー筋本体に接続される構造である請求項１記載の後施工アンカー工法。 The post-construction anchor method according to claim 1, wherein the anchor muscle tip portion is integrated with or connected to the anchor muscle main body. アンカー筋先端部にアンカー筋挿入に伴って楔効果で拡大する拡張部を形成し、拡張部が孔先端部の壁面に圧接される請求項１または２記載の後施工アンカー工法。 The post-construction anchor method according to claim 1 or 2, wherein an expansion portion that expands by a wedge effect is formed at the anchor muscle distal end portion and the expansion portion is pressed against the wall surface of the hole distal end portion. アンカー筋先端部が接着材により前記小径の孔に固定される請求項１乃至３いずれか１項記載の後施工アンカー工法。 The post-construction anchor method according to any one of claims 1 to 3, wherein an anchor bar tip is fixed to the small-diameter hole by an adhesive. 前記小径の孔がアンカー筋先端部を孔中心に誘導するテーパー部を有している請求項１乃至４いずれか１項記載の後施工アンカー工法。 The post-construction anchor method according to any one of claims 1 to 4, wherein the small-diameter hole has a tapered portion that guides the tip of the anchor bar to the center of the hole. アンカー筋に充填材が漏れ出すのを防ぐ部材が取り付けられている請求項１乃至５いずれか１項記載の後施工アンカー工法。 The post-construction anchor method according to any one of claims 1 to 5, wherein a member for preventing the filler from leaking to the anchor bar is attached.
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