JP7289245B2

JP7289245B2 - Anchor installation structure

Info

Publication number: JP7289245B2
Application number: JP2019166028A
Authority: JP
Inventors: 和俊高室; 展生野村; 洋一窪田
Original assignee: Sekisui Jushi Corp
Current assignee: Sekisui Jushi Corp
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2023-06-09
Anticipated expiration: 2039-09-12
Also published as: JP2021042598A

Description

本発明は、例えばアスファルト、レンガ、ＡＬＣ、軽量気泡コンクリート（ＡＬＣ）、低強度コンクリート等の通常のコンクリートに比べて強度が低い脆弱母材にアンカーを設置するアンカー設置構造に関する。 The present invention relates to an anchor installation structure for installing anchors in fragile base materials having lower strength than ordinary concrete such as asphalt, brick, ALC, lightweight cellular concrete (ALC), and low-strength concrete.

従来、アスファルトのような脆弱母材に取付物を取り付ける際に、脆弱母材にアンカーを設置し、アンカーを介して取付物を取り付けることが行なわれている。脆弱母材にアンカーを設置する場合、例えば図１１（ａ）に示すように、内周に雌ねじ２１１が形成されたスリーブ２１０と、雌ねじ２１１と螺合される雄ねじ２２１が外周に形成された寸切ボルト２２０で構成されるアンカー２００を用い、脆弱母材２３０に形成されたスリーブ２１０の長さとほぼ対応する深さの有底穴２３１にアンカー２００のスリーブ２１０を収容し、十分な定着長でスリーブ２１０を接着材２４０で有底穴２３１の周囲の脆弱母材２３０に定着して設置する。 Conventionally, when attaching an object to a fragile base material such as asphalt, an anchor is installed on the fragile base material, and the object is attached via the anchor. When installing an anchor on a fragile base material, for example, as shown in FIG. Using the anchor 200 composed of the cut bolt 220, the sleeve 210 of the anchor 200 is accommodated in the bottomed hole 231 having a depth substantially corresponding to the length of the sleeve 210 formed in the fragile base material 230, and the anchor 200 has a sufficient fixing length. The sleeve 210 is fixed and installed on the fragile base material 230 around the bottomed hole 231 with the adhesive 240 .

また、特許文献１のように、脆弱母材のアスファルトを貫通するように貫通穴を形成し、アスファルトの下の土部分にアスファルトの貫通穴よりも直径の大きい有底穴を形成して羽根型アンカーを挿入し、挿入した羽根型アンカーの拡張片を開いた状態にすると共に、有底穴と貫通穴の残部の空隙にモルタルを注入してアンカーを設置する構造もある。 In addition, as in Patent Document 1, a through hole is formed so as to penetrate the asphalt of the brittle base material, and a bottomed hole having a larger diameter than the through hole of the asphalt is formed in the soil under the asphalt to form a vane shape. There is also a structure in which the anchor is installed by inserting the anchor, opening the expanded piece of the inserted vane-shaped anchor, and injecting mortar into the remaining gap between the bottomed hole and the through hole.

特開２００６－２２８１６５号Japanese Patent Application Laid-Open No. 2006-228165

しかし、取付物やアンカーを脆弱母材に設置する場合、設置される環境や取付物の機能によっては、単に強度が高い定着力でアンカーを設置すれば事足りることにはならない。例えば道路のアスファルト舗装上に立設物をアンカーを設置して取り付ける場合、その立設物に自動車が衝突しても負けないように強固な定着力でアンカーを設置していると、自動車が衝突した際に、ボルト軸方向への引張荷重Ｐやボルト軸方向と直角方向へのせん断荷重Ｔが加わって、脆弱母材の大きな領域が母材ごと破壊されてしまう（図１１（ｂ）、（ｃ）参照）。このような母材の破壊が生ずると、アンカーや立設物だけではなく脆弱母材の深い位置まで補修しなければならなくなり、修理・復旧に大きな労力が必要となる。そのため、通常の使用時には必要十分な設置強度の定着力を有すると共に、万一衝撃力が加わったときに母材の破壊を防止することができる構造が求められている。 However, when installing an attachment or an anchor on a fragile base material, depending on the environment in which it is installed and the function of the attachment, simply installing the anchor with a high fixing force may not be sufficient. For example, when installing an anchor on the asphalt pavement of a road, if the anchor is installed with a strong fixing force so that it will not lose even if the car collides with the standing object, the car will not collide. At this time, a tensile load P in the direction of the bolt axis and a shear load T in the direction perpendicular to the bolt axis are applied, and a large area of the fragile base material is destroyed together with the base material (Fig. 11 (b), ( c) see). When such damage to the base material occurs, not only the anchors and standing structures but also the fragile base material must be repaired at deep positions, requiring a great deal of labor for repair and recovery. Therefore, there is a demand for a structure that has sufficient installation strength during normal use and that can prevent the base material from breaking when an impact force is applied.

本発明は上記課題に鑑み提案するものであって、通常の使用時には必要十分な設置強度の定着力を得ることができると共に、万一衝撃力が加わったときにアンカーが設置されている脆弱母材の破壊を防止することができ、破損時の修理・復旧作業を少ない労力で行うことができるアンカー設置構造を提供することを目的とする。 The present invention has been proposed in view of the above problems, and is a fragile base in which anchors are installed in the event that an impact force is applied, as well as being able to obtain a fixing force with sufficient installation strength during normal use. To provide an anchor installation structure capable of preventing breakage of a material and performing repair/restoration work at the time of breakage with less labor.

本発明のアンカー設置構造は、内周に雌ねじ部が形成された外装体と、前記外装体の雌ねじ部に螺合される雄ねじ部が外周に形成された破断誘発ボルトから構成されるアンカーを脆弱母材に設置する設置構造であって、前記脆弱母材に形成された有底穴若しくは前記脆弱母材から前記脆弱母材より深い位置にある深層まで形成された有底穴に、未硬化の定着材が下側から内部に浸入しない有底筒形の形状で形成された前記外装体が収容され、前記有底穴の空隙に前記定着材が充填され、硬化した前記定着材で前記外装体が前記脆弱母材に定着され、前記破断誘発ボルトの雄ねじ部が前記外装体の雌ねじ部に螺合されて前記破断誘発ボルトが前記脆弱母材に定着されていると共に、前記脆弱母材の表面から突出する前記破断誘発ボルトの突出部分におけるボルト軸方向の所定位置に、少なくとも前記外装体へ螺合する前記雄ねじ部よりも強度が低い破断誘発部が設けられていることを特徴とする。
これによれば、有底穴に収容した外装体の雌ねじ部に雄ねじ部を螺合して破断誘発ボルトを定着することにより、通常の使用時には必要十分な設置強度の定着力を得ることができる。また、破断誘発ボルトの突出部分におけるボルト軸方向の所定位置の破断誘発部により、万一衝撃力が加わったときに破断誘発部でアンカーを破断させ、アンカーが設置されている脆弱母材の破壊を防止することができる。従って、破損時の修理・復旧作業を少ない労力で行うことができる。また、定着材でアンカーを定着することにより、より確実に必要十分な設置強度の定着力を得ることができる。 The anchor installation structure of the present invention comprises an outer body having a female threaded portion on the inner periphery and a fracture-inducing bolt having a male threaded portion on the outer periphery that is screwed into the female threaded portion of the outer body. An installation structure to be installed in a base material, wherein a bottomed hole formed in the fragile base material or a bottomed hole formed from the fragile base material to a deep layer at a position deeper than the fragile base material has an unhardened The exterior body formed in the shape of a bottomed cylinder that does not allow the fixing material to enter from below is accommodated, and the fixing material is filled in the gap of the bottomed hole, and the cured fixing material is used for the exterior body. is fixed to the fragile base material, and the male threaded portion of the breakage inducing bolt is screwed into the female threaded portion of the exterior body so that the breakage inducing bolt is fixed to the fragile base material, and the surface of the fragile base material At a predetermined position in the bolt axial direction of the protruding portion of the break-inducing bolt protruding from, a break-inducing portion having a strength lower than that of the male threaded portion screwed into at least the exterior body is provided.
According to this, by screwing the male threaded portion into the female threaded portion of the exterior body accommodated in the bottomed hole to fix the fracture triggering bolt, it is possible to obtain a necessary and sufficient fixing force for installation strength during normal use. . In addition, if an impact force is applied, the anchor is broken at the break-inducing part at a predetermined position in the bolt axial direction in the protruding part of the break-inducing bolt, and the fragile base material on which the anchor is installed is destroyed. can be prevented. Therefore, it is possible to perform repair/restoration work at the time of damage with less labor. Further, by fixing the anchor with the fixing material, it is possible to more reliably obtain the necessary and sufficient fixing strength.

本発明のアンカー設置構造は、前記破断誘発部が前記破断誘発ボルトの軸部の断面積が小さくなるように切り欠き状に形成されていると共に略多角柱形で形成され、破断されて露出した略多角柱形の前記破断誘発部が工具で把持可能になっていることを特徴とする。
これによれば、破断誘発ボルトを切り欠いて簡単に破断誘発部を形成することができる。また、破断誘発ボルトの断面積を切欠きの量で調整することが容易であり、破断誘発ボルトが破断する荷重を切欠き量の調整で容易に設定することができる。また、破断誘発ボルトの破断誘発部の断面積を小さく形成することにより、脆弱母材の破壊防止に加えて、外装体の内部で螺合された破断誘発ボルトの雄ねじ部が破損することも防止することができる。また、破断誘発部が破断した際に、略四角柱形、略六角柱形等の略多角柱形の破断された破断誘発部が露出して残ることになり、レンチ等の工具で露出した略多角形の破断誘発部を把持して容易に破断した破断誘発ボルトを回転して取り外すことができる。 In the anchor installation structure of the present invention, the break-inducing part is formed in a notch shape so that the cross-sectional area of the shaft part of the break-inducing bolt becomes small , and is formed in a substantially polygonal prism shape, and is broken and exposed. It is characterized in that the substantially polygonal prism-shaped fracture inducing portion can be gripped by a tool .
According to this, it is possible to easily form the breakage induction portion by notching the breakage induction bolt. In addition, it is easy to adjust the cross-sectional area of the break-inducing bolt by adjusting the amount of the notch, and the load at which the break-inducing bolt breaks can be easily set by adjusting the amount of the notch. In addition, by reducing the cross-sectional area of the fracture-inducing portion of the fracture-inducing bolt, in addition to preventing breakage of the fragile base material, it also prevents damage to the male threaded portion of the fracture-inducing bolt that is screwed inside the exterior body. can do. In addition, when the break-inducing part is broken, the broken break-inducing part in a substantially polygonal prism shape such as a substantially quadrangular prism shape, a substantially hexagonal prism shape, etc. is exposed and remains, and it is exposed with a tool such as a wrench. By gripping the polygonal breakage triggering part, the broken breakage triggering bolt can be easily removed by rotating.

本発明のアンカー設置構造は、前記脆弱母材の表面と前記破断誘発部との間に前記破断誘発ボルトの雄ねじ部が設けられることを特徴とする。
これによれば、破断誘発部が破断した際に、脆弱母材の表面から雄ねじ部が突出した状態で残るため、破断誘発部の損傷度合に拘わらず、全ねじレンチ等の工具を突出した雄ねじ部にはめて容易に破断した破断誘発ボルトを回転して取り外すことができる。 The anchor installation structure of the present invention is characterized in that the male threaded portion of the fracture inducing bolt is provided between the surface of the fragile base material and the fracture inducing portion.
According to this, when the fracture inducing part breaks, the male screw remains in a state of protruding from the surface of the fragile base material, so regardless of the degree of damage to the fracture inducing part, a tool such as a full thread wrench can be used to protrude the male screw. It is possible to rotate and remove the breakage trigger bolt that is easily broken by fitting it in the part.

また、本発明のアンカー設置構造の再生方法は、本発明のアンカー設置構造で前記破断誘発ボルトが前記破断誘発部で破断した際に、前記破断誘発部で破断した前記破断誘発ボルトの残り部分を前記外装体から取り外し、前記残り部分を取り外して残った前記外装体に別の破断誘発ボルトを螺合して取り付けることを特徴とする。
これによれば、破断誘発ボルトが破断誘発部で破断して外装体から取り外された際に、損傷せずに残った外装体を再利用し、破断誘発部で破断した破断誘発ボルトとは異なる新たな別の破断誘発ボルトを取り付けて新たなアンカーを構成することができ、部品資源の有効利用、部品コストの低減を図ることができる。また、既存の有底穴に収容された外装体を利用してアンカーを設置できることから、アンカーの設置作業、新たな取付物の取付作業等の修理・復旧作業を効率的且つスピーディに行うことができる。 Further, in the method for regenerating the anchor installation structure of the present invention, when the breakage-inducing bolt is broken at the breakage-inducing portion in the anchor-installation structure of the present invention, the remaining portion of the breakage-inducing bolt broken at the breakage-inducing portion is replaced. It is characterized by removing it from the exterior body, removing the remaining portion, and attaching another breakage-inducing bolt to the remaining exterior body by screwing it .
According to this, when the break-inducing bolt breaks at the break-inducing part and is removed from the exterior body, the remaining undamaged armor body is reused, unlike the break-inducing bolt that breaks at the break-inducing part. It is possible to construct a new anchor by attaching a new and different breakage-inducing bolt, and it is possible to effectively use part resources and reduce part costs. In addition, since the anchor can be installed using the exterior body housed in the existing bottomed hole, it is possible to efficiently and speedily carry out repair and restoration work such as anchor installation work and new attachment work. can.

また、本発明の衝撃吸収型取付物の設置構造は、本発明のアンカー設置構造の前記アンカーを介して設置されている衝撃吸収型取付物の設置構造であって、前記衝撃吸収型取付物は、変形によって衝撃を吸収するように設けられると共に、前記破断誘発ボルトの前記破断誘発部を破断させる力よりも小さな力で前記衝撃吸収型取付物の前記変形が生じるように設けられていることを特徴とする。
これによれば、衝撃吸収型取付物に衝撃が加わった際の変形を強固過ぎる固定で阻害することなく、必要な変形の発生を確保した状態で衝撃吸収型取付物を取り付けることができる。また、破断誘発部を破断させる力よりも小さな力で衝撃吸収型取付物の変形が生じるように設けることで、必要な変形の発生を確保した状態で衝撃吸収型防護柵等の衝撃吸収型取付物を取り付けることができる。更に、この変形では吸収しきれないほどの大きな衝撃が衝撃吸収型取付物に加えられたときに、破断誘発ボルトの破断誘発部が破断することで、脆弱母材の破損を効果的に抑制できる。 Further, the installation structure of a shock absorption type attachment of the present invention is an installation structure of a shock absorption type attachment that is installed via the anchor of the anchor installation structure of the present invention, wherein the impact absorption type attachment is and that the deformation of the impact-absorbing attachment is caused by a force smaller than the force that breaks the breakage triggering portion of the breakage triggering bolt. Characterized by
According to this, it is possible to attach the impact absorption type attachment in a state in which necessary deformation is ensured without inhibiting the deformation when the impact is applied to the impact absorption type attachment by too strong fixation. In addition, by providing a force that is smaller than the force that ruptures the break-inducing part, the impact-absorbing attachment can be deformed. You can attach things. Furthermore, when a shock that is too large to be absorbed by this deformation is applied to the impact-absorbing attachment, the fracture-inducing portion of the fracture-inducing bolt breaks, thereby effectively suppressing damage to the fragile base material. .

本発明のアンカー設置構造によれば、通常の使用時には必要十分な設置強度の定着力を得ることができると共に、万一衝撃力が加わったときにアンカーが設置されている脆弱母材の破壊を防止することができ、破損時の修理・復旧作業を少ない労力で行うことができる。 According to the anchor installation structure of the present invention, it is possible to obtain the necessary and sufficient installation strength of fixing force during normal use, and to prevent the breakage of the fragile base material on which the anchor is installed in the unlikely event that an impact force is applied. It is possible to prevent damage, and repair/restoration work at the time of damage can be performed with less labor.

本発明による第１実施形態のアンカー設置構造で取付物が取り付けられた状態を示す斜視図。1 is a perspective view showing a state in which an attachment is attached in the anchor installation structure of the first embodiment according to the present invention; FIG. 第１実施形態のアンカー設置構造を示す一部断面説明図。BRIEF DESCRIPTION OF THE DRAWINGS Partial cross-section explanatory drawing which shows the anchor installation structure of 1st Embodiment. （ａ）は第１実施形態のアンカー設置構造におけるアンカーの外装体の正面図、（ｂ）はその縦断面図。(a) is a front view of the exterior body of the anchor in the anchor installation structure of 1st Embodiment, (b) is the longitudinal cross-sectional view. （ａ）は第１実施形態のアンカー設置構造におけるアンカーの破断誘発ボルトの平面図、（ｂ）はその正面図、（ｃ）はそのＡ－Ａ矢視断面図。(a) is a plan view of a fracture-inducing bolt of an anchor in the anchor installation structure of the first embodiment, (b) is its front view, and (c) is its AA cross-sectional view. （ａ）～（ｃ）は第１実施形態のアンカー設置構造における破断誘発ボルトの破断と撤去を説明する一部断面説明図。4(a) to 4(c) are partial cross-sectional explanatory views for explaining breaking and removal of a breakage-inducing bolt in the anchor installation structure of the first embodiment; FIG. 第２実施形態のアンカー設置構造を示す一部断面説明図。Partial cross-sectional explanatory drawing which shows the anchor installation structure of 2nd Embodiment. （ａ）は第２実施形態のアンカー設置構造におけるアンカーの破断誘発ボルトの正面図、（ｂ）は破断誘発ボルトに螺合されるナットの正面図、（ｃ）は破断誘発ボルトに外挿されるワッシャーの正面図、（ｄ）は同図（ａ）のアンカーの外装体の縦断面図。(a) is a front view of a breakage-inducing bolt of an anchor in the anchor installation structure of the second embodiment, (b) is a front view of a nut screwed onto the breakage-induction bolt, and (c) is fitted onto the breakage-induction bolt. The front view of a washer, (d) is a longitudinal cross-sectional view of the exterior body of the anchor of the same figure (a). （ａ）、（ｂ）は第２実施形態のアンカー設置構造における破断誘発ボルトの破断と撤去を説明する一部断面説明図。(a), (b) is partial cross-sectional explanatory drawing explaining the fracture|rupture and removal of the fracture|rupture induction bolt in the anchor installation structure of 2nd Embodiment. 第３実施形態のアンカー設置構造を示す一部断面説明図。Partial cross-sectional explanatory drawing which shows the anchor installation structure of 3rd Embodiment. 第４実施形態のアンカー設置構造を示す一部断面説明図。FIG. 11 is a partial cross-sectional explanatory view showing the anchor installation structure of the fourth embodiment; （ａ）は従来例のアンカー設置構造の一部断面説明図、（ｂ）、（ｃ）は従来例のアンカー設置構造の母材破壊を説明する説明図。(a) is a partial cross-sectional explanatory view of a conventional anchor installation structure, and (b) and (c) are explanatory views explaining base material failure of the conventional anchor installation structure.

〔第１実施形態のアンカー設置構造〕
本発明による第１実施形態のアンカー設置構造は、アスファルト、レンガ、ＡＬＣ、軽量気泡コンクリート（ＡＬＣ）、低強度コンクリート等の通常のコンクリートに比べて強度が低い脆弱母材１００にアンカー１を設置するアンカー設置構造であり、例えば図１及び図２に示すように、アスファルト舗装等の脆弱母材１００にアンカー１が設置される。設置されたアンカー１は取付物１２０の取り付けに用いられ、例えばワイヤーロープ式防護柵など変形で衝撃を吸収する衝撃吸収型取付物がアンカー１を介して取り付けられる。 [Anchor installation structure of the first embodiment]
In the anchor installation structure of the first embodiment according to the present invention, the anchor 1 is installed on a fragile base material 100 having a lower strength than ordinary concrete such as asphalt, brick, ALC, lightweight cellular concrete (ALC), and low-strength concrete. It is an anchor installation structure, and as shown in FIGS. 1 and 2, an anchor 1 is installed on a fragile base material 100 such as asphalt pavement. The installed anchor 1 is used to attach an attachment 120 , and a shock absorbing attachment that absorbs impact by deformation, such as a wire rope protection fence, is attached via the anchor 1 .

第１実施形態のアンカー設置構造におけるアンカー１は、図２～図４に示すように、外装体２と、破断誘発ボルト３とから構成される。外装体２は有底円筒形等の有底筒形で形成され、後述する未硬化の定着材５が下側から内部に浸入しない形状になっていると共に、その内周に雌ねじ部２１が形成されている。破断誘発ボルト３は、頭部３１と軸部３２で構成される頭付ボルトの形状であり、図示例では六角ボルトの形状になっている。破断誘発ボルト３の軸部３２の下部の外周には雄ねじ部３３が形成されており、雄ねじ部３３は外装体２の雌ねじ部２１に螺合されるようになっている。 The anchor 1 in the anchor installation structure of the first embodiment is composed of an exterior body 2 and a fracture inducing bolt 3, as shown in FIGS. The exterior body 2 is formed in a cylindrical shape with a bottom, such as a cylinder with a bottom. It is The break-inducing bolt 3 has a headed bolt shape composed of a head portion 31 and a shaft portion 32, and has a hexagonal bolt shape in the illustrated example. A male threaded portion 33 is formed on the outer periphery of the lower portion of the shaft portion 32 of the breakage inducing bolt 3 , and the male threaded portion 33 is screwed into the female threaded portion 21 of the exterior body 2 .

破断誘発ボルト３には、頭部３１の首下に位置する軸部３２の上部に破断誘発部３４が形成されている。破断誘発部３４は、ボルト軸方向の所定位置に設けられ、ボルト軸方向の少なくとも外装体２へ螺合する雄ねじ部３３よりも低い強度で形成されており、第１実施形態では破断誘発ボルト３の軸部３２の断面積が雄ねじ部３３よりも小さくなるように切り欠かれて破断誘発部３４が形成されている。また、第１実施形態における破断誘発部３４は、横断面形状が略多角形の略多角柱形で形成されており、図示例では横断面形状が略四角形の略四角柱形で形成されている。 The breakage triggering bolt 3 has a breakage triggering portion 34 formed on the upper portion of the shaft portion 32 positioned below the neck of the head portion 31 . The break-inducing portion 34 is provided at a predetermined position in the bolt axial direction, and is formed with a strength lower than that of the male thread portion 33 screwed into at least the exterior body 2 in the bolt axial direction. A fracture induction portion 34 is formed by notching so that the cross-sectional area of the shaft portion 32 is smaller than that of the male thread portion 33 . Further, the fracture inducing portion 34 in the first embodiment is formed in a substantially polygonal prism shape with a substantially polygonal cross-sectional shape, and in the illustrated example, it is formed in a substantially quadrangular prism shape with a substantially quadrangular cross-sectional shape. .

なお、破断誘発部３４は、望ましくは、頭部３１の首下に位置する側の断面積より軸部３２に近い側の断面積が大きくなるよう、テーパ状に形成されていることが望ましい。或いは、破断誘発部３４における頭部３１の首下の近くに、若干の切込みが入っていても良い。これによれば、取付物１２０に衝撃力が加わったときに、破断誘発部３４が、下部で破断することなく確実に頭部３１の近傍等の上部で破断するので、残った破断誘発部３４に工具を嵌めて、容易に取り外すことが可能となる。 It is desirable that the fracture induction portion 34 be tapered so that the cross-sectional area on the side closer to the shaft portion 32 is larger than the cross-sectional area on the side located under the neck of the head portion 31 . Alternatively, a slight notch may be formed near the neck of the head portion 31 in the fracture induction portion 34 . According to this, when an impact force is applied to the attachment 120, the fracture inducing portion 34 does not fracture in the lower portion, but the upper portion such as the vicinity of the head portion 31 reliably fractures. It is possible to easily remove it by fitting a tool in.

第１実施形態のアンカー設置構造では、図２に示すように、脆弱母材１００に形成された有底穴１１０にアンカー１の外装体２が脆弱母材１００の表面側で開放するようにして収容される。そして、取付物１２０を脆弱母材１００の表面に載置し、所定箇所で取付物１２０にワッシャー４を重ね、取付物１２０の貫通孔１２１、ワッシャー４の貫通孔４１に破断誘発ボルト３を挿入し、挿入した破断誘発ボルト３の雄ねじ部３３を有底穴１１０に収容された外装体２の雌ねじ部２１に螺合して、破断誘発ボルト３が脆弱母材１００に定着されると共に、取付物１２０がアンカー１で支持されて脆弱母材１００に固定されるようにして取り付けられる。 In the anchor installation structure of the first embodiment, as shown in FIG. be accommodated. Then, the attachment 120 is placed on the surface of the fragile base material 100 , the washer 4 is overlapped on the attachment 120 at a predetermined position, and the fracture inducing bolt 3 is inserted into the through hole 121 of the attachment 120 and the through hole 41 of the washer 4 . Then, the male threaded portion 33 of the inserted fracture inducing bolt 3 is screwed into the female threaded portion 21 of the exterior body 2 accommodated in the bottomed hole 110, and the fracture inducing bolt 3 is fixed to the fragile base material 100 and attached. An object 120 is supported by the anchor 1 and attached so as to be fixed to the fragile base material 100 .

また、このアンカー設置構造では、有底穴１１０の空隙に定着材５が充填され、硬化した定着材５でアンカー１或いは外装体２が脆弱母材１００に定着されている。図示例では、有底穴１１０内に予め定着材５の樹脂を入れておき、樹脂が注入された有底穴１１０に外装体２を埋設し、その後に樹脂を硬化させ、この硬化樹脂の定着材５でアンカー１或いは外装体２が脆弱母材１００に定着されている。 Further, in this anchor installation structure, the gap of the bottomed hole 110 is filled with the fixing material 5 , and the anchor 1 or the exterior body 2 is fixed to the fragile base material 100 with the hardened fixing material 5 . In the illustrated example, the resin of the fixing material 5 is placed in the bottomed hole 110 in advance, the exterior body 2 is embedded in the bottomed hole 110 into which the resin is injected, and then the resin is cured to fix the cured resin. The anchor 1 or the armor 2 is fixed to the fragile base material 100 with the material 5 .

有底穴１１０に収容された外装体２に螺着された破断誘発ボルト３において、脆弱母材１００の表面から突出する破断誘発ボルト３の突出部分には、ボルト軸方向の所定位置にある破断誘発部３４が配設される。図示例では、アンカー１を介して取り付けた取付物１２０の貫通孔１２１とワッシャー４の貫通孔４１の内側に収まるように位置して破断誘発部３４が配置されている。 In the breakage-inducing bolt 3 screwed into the exterior body 2 accommodated in the bottomed hole 110, the protruding portion of the breakage-inducing bolt 3 protruding from the surface of the fragile base material 100 has a breakage at a predetermined position in the bolt axial direction. An inducer 34 is provided. In the illustrated example, the fracture inducer 34 is arranged so as to be accommodated inside the through hole 121 of the attachment 120 attached via the anchor 1 and the through hole 41 of the washer 4 .

第１実施形態のアンカー設置構造で取り付けられた取付物１２０に衝撃力が加わり、アンカー１に引張荷重Ｐが負荷された場合（図５（ａ）参照）、脆弱母材１００の破壊や外装体２の損傷を生ずることなく、断面積が小さく強度が低いアンカー１の破断誘発部３４に応力が集中し、破断誘発部３４が図５（ｂ）の白抜矢印のように破断する。また、アンカー１にせん断荷重Ｔが負荷された場合にも、脆弱母材１００の破壊や外装体２の損傷を生ずることなく、アンカー１の破断誘発部３４が同様に破断する。そして、脆弱母材１００に残った破断誘発ボルト３の残り部分は、略四角柱形等の破断した破断誘発部３４を工具で把持して外装体２から取り外し、脆弱母材１００から撤去する（図５（ｃ）参照）。 When an impact force is applied to the attachment 120 attached by the anchor installation structure of the first embodiment, and a tensile load P is applied to the anchor 1 (see FIG. 5(a)), the fragile base material 100 is destroyed and the exterior body Without causing the damage of 2, the stress concentrates on the fracture-inducing portion 34 of the anchor 1, which has a small cross-sectional area and low strength, and the fracture-inducing portion 34 breaks as indicated by the white arrow in FIG. 5(b). Further, even when the shear load T is applied to the anchor 1, the fracture induction portion 34 of the anchor 1 likewise fractures without causing destruction of the fragile base material 100 or damage to the exterior body 2. Then, the remaining portion of the fracture inducing bolt 3 remaining on the fragile base material 100 is removed from the exterior body 2 by gripping the fractured fracture inducing part 34 such as a substantially quadrangular prism with a tool, and removed from the fragile base material 100 ( See FIG. 5(c)).

破断した破断誘発ボルト３が取り外された外装体２は、硬化した定着材５で脆弱母材１００に定着された状態が維持されている。そのため、破断した破断誘発ボルト３と異なる同一形状、同一サイズで破断していない別の破断誘発ボルト３を外装体２に螺着して再利用することが可能であり、定着された外装体２の雌ねじ部２１に破断した破断誘発ボルト３とは異なる別の破断誘発ボルト３の雄ねじ部３３を螺合して別の破断誘発ボルト３を取り付け、新たなアンカー１を構成し、アンカー設置構造を再生することが可能である。 The exterior body 2 from which the broken fracture inducing bolt 3 has been removed is maintained in a state of being fixed to the fragile base material 100 by the hardened fixing material 5 . Therefore, it is possible to reuse another fracture inducing bolt 3 that has the same shape and the same size as the fracture inducing bolt 3 that has been fractured and that has not been fractured, by screwing it into the exterior body 2 to reuse it. A new fracture-inducing bolt 3 is attached by screwing the male-threaded portion 33 of another fracture-inducing bolt 3 different from the broken fracture-inducing bolt 3 into the female threaded portion 21 of the anchor installation structure. It is possible to play.

第１実施形態のアンカー設置構造によれば、有底穴１１０に収容した外装体２の雌ねじ部２１に雄ねじ部３３を螺合して破断誘発ボルト３を定着することにより、通常の使用時には必要十分な設置強度の定着力を得ることができる。更に、有底穴１１０の空隙に定着材５を充填し、硬化した定着材５でアンカー１を定着することにより、より確実に必要十分な設置強度の定着力を得ることができる。また、破断誘発ボルト３の突出部分におけるボルト軸方向の所定位置の破断誘発部３４により、万一衝撃力が加わったときに破断誘発部３４でアンカー１を破断させ、アンカー１が設置されている脆弱母材１００の破壊を防止することができる。従って、破損時の修理・復旧作業を少ない労力で行うことができる。 According to the anchor installation structure of the first embodiment, by screwing the male threaded portion 33 into the female threaded portion 21 of the exterior body 2 housed in the bottomed hole 110 to fix the breakage-inducing bolt 3, the necessary A fixing force with sufficient installation strength can be obtained. Further, by filling the gap of the bottomed hole 110 with the fixing material 5 and fixing the anchor 1 with the hardened fixing material 5, it is possible to more reliably obtain the necessary and sufficient fixing strength. In addition, if an impact force is applied, the anchor 1 is broken by the breakage triggering portion 34, and the anchor 1 is installed. Breakage of the fragile base material 100 can be prevented. Therefore, it is possible to perform repair/restoration work at the time of damage with less labor.

また、破断誘発部３４を破断誘発ボルト３の軸部３２の断面積が小さくなるように切り欠き状に形成することにより、強度が低い破断誘発部３４を簡単に形成することができる。また、破断誘発ボルト３の断面積を切欠きの量で調整することが容易であり、破断誘発ボルト３が破断する荷重を切欠き量の調整で容易に設定することができる。また、破断誘発ボルト３の破断誘発部３４の断面積を小さく形成することにより、脆弱母材１００の破壊防止に加えて、外装体２の内部で螺合された破断誘発ボルト３の雄ねじ部３３が破損することも防止することができる。 Further, by forming the fracture induction portion 34 in a notched shape so that the cross-sectional area of the shaft portion 32 of the fracture induction bolt 3 is reduced, the fracture induction portion 34 having low strength can be easily formed. Further, it is easy to adjust the cross-sectional area of the breakage inducing bolt 3 by adjusting the amount of the notch, and the load at which the breakage inducing bolt 3 breaks can be easily set by adjusting the amount of the notch. Further, by forming the cross-sectional area of the fracture inducing portion 34 of the fracture inducing bolt 3 to be small, in addition to preventing breakage of the fragile base material 100, the male threaded portion 33 of the fracture inducing bolt 3 screwed inside the exterior body 2 can also be prevented from being damaged.

また、破断誘発部３４を略多角柱形で形成することにより、破断誘発部３４が破断した際に、略四角柱形、略六角柱形等の略多角柱形の破断された破断誘発部３４が露出して残ることになり、レンチ等の工具で露出した略多角形の破断誘発部３４を把持して、容易に破断した破断誘発ボルト３を回転して取り外すことができる。 In addition, by forming the fracture inducing portion 34 in a substantially polygonal prism shape, when the fracture inducing portion 34 is broken, the broken fracture inducing portion 34 has a substantially polygonal prism shape such as a substantially quadrangular prism shape, a substantially hexagonal prism shape, or the like. is exposed and remains, and the broken breakage induction bolt 3 can be easily rotated and removed by gripping the exposed substantially polygonal breakage induction portion 34 with a tool such as a wrench.

また、第１実施形態のアンカー設置構造では、破断誘発ボルト３が破断誘発部３４で破断して外装体２から取り外された際に、損傷せずに残った外装体２を再利用し、破断誘発部３４で破断した破断誘発ボルト３とは異なる新たな別の破断誘発ボルト３を取り付けて新たなアンカー１を構成することができ、部品資源の有効利用、部品コストの低減を図ることができる。また、既存の有底穴１１０に収容された外装体２を利用してアンカー１を設置できることから、アンカー１の設置作業、新たな取付物１２０の取付作業等の修理・復旧作業を効率的且つスピーディに行うことができる。 In addition, in the anchor installation structure of the first embodiment, when the break-inducing bolt 3 is broken at the break-inducing portion 34 and removed from the exterior body 2, the exterior body 2 that remains undamaged is reused and broken. It is possible to configure a new anchor 1 by attaching a new and different breakage triggering bolt 3 different from the breakage triggering bolt 3 broken at the triggering part 34, and it is possible to effectively utilize part resources and reduce part costs. . In addition, since the anchor 1 can be installed using the exterior body 2 housed in the existing bottomed hole 110, the installation work of the anchor 1, the installation work of the new attachment 120, and other repair/restoration work can be performed efficiently and efficiently. It can be done quickly.

また、第１実施形態のアンカー設置構造で変形で衝撃を吸収する衝撃吸収型取付物がアンカー１を介して取り付けられる構造では、衝撃吸収型取付物に衝撃が加わった際の変形を強固過ぎる固定で阻害することなく、必要な変形の発生を確保した状態で衝撃吸収型取付物を取り付けることができる。例えば道路の中央分離帯用途等に設置されるワイヤーロープ式防護柵など衝撃吸収型防護柵は、車両衝突時にワイヤーロープの張力等で車両を受け止めると共に、支柱の変形や倒れ込みによって衝撃を緩和するものであり、支柱の定着力が強すぎると衝撃を緩和することができなくなってしまうが、破断誘発部３４を有するアンカー１を介しての取り付けにより、必要な変形の発生を確保した状態で衝撃吸収型防護柵を取り付けることができる。 In addition, in the anchor installation structure of the first embodiment, in which a shock-absorbing attachment that absorbs shock by deformation is attached via the anchor 1, deformation when an impact is applied to the shock-absorbing attachment cannot be fixed too firmly. It is possible to attach the impact absorbing attachment while securing the required deformation without hindering the attachment. For example, shock-absorbing protective fences such as wire rope protective fences installed for road median strips, etc., receive vehicles with the tension of wire ropes in the event of a vehicle collision, and mitigate the impact by deforming or collapsing columns. If the fixing force of the support post is too strong, the impact cannot be mitigated. A type guardrail can be installed.

また、第１実施形態のアンカー設置構造で衝撃吸収型取付物をアンカー１を介して取り付け、変形によって衝撃を吸収するように設けられる衝撃吸収型取付物の設置構造においては、破断誘発ボルト３の破断誘発部３４を破断させる力よりも小さな力で、衝撃を吸収するための衝撃吸収型取付物の変形が生じるように設けることが好ましい。例えば道路の中央分離帯用途等に設置されるワイヤーロープ式防護柵など衝撃吸収型防護柵は、車両衝突時にワイヤーロープの張力等で車両を受け止めると共に、支柱の変形や倒れ込みによって衝撃を緩和するものであるが、ワイヤーや支柱等の変形が生じるよりも小さな力で破断誘発部３４が破断すると、衝撃吸収型取付物の備える衝撃を吸収し緩和する機能が十分に発揮されなくなってしまう。そのため、破断誘発部３４を破断させる力よりも小さな力で衝撃吸収型取付物の変形が生じるように設けることで、必要な変形の発生を確保した状態で衝撃吸収型防護柵等の衝撃吸収型取付物を取り付けることができる。更に、この変形では吸収しきれないほどの大きな衝撃が衝撃吸収型取付物に加えられたときに、破断誘発ボルト３の破断誘発部３４が破断することで、脆弱母材１００の破損を効果的に抑制できる。 In addition, in the anchor installation structure of the first embodiment, the impact absorption type attachment is attached via the anchor 1, and in the installation structure of the impact absorption type attachment that is provided so as to absorb the impact by deformation, the fracture inducing bolt 3 It is preferable that the deformation of the shock absorption type attachment for absorbing the shock is generated by a force smaller than the force that breaks the breakage inducing portion 34 . For example, shock-absorbing protective fences such as wire rope protective fences installed for road median strips, etc., receive vehicles with the tension of wire ropes in the event of a vehicle collision, and mitigate the impact by deforming or collapsing columns. However, if the fracture triggering portion 34 breaks with a force smaller than the force that causes deformation of the wire, support, etc., the function of absorbing and mitigating the impact provided by the impact absorbing attachment will not be sufficiently exhibited. Therefore, by providing deformation of the impact absorption type attachment with a force smaller than the force that breaks the breakage triggering part 34, the impact absorption type attachment such as the impact absorption type protective fence can be used while securing the necessary deformation. Attachments can be attached. Furthermore, when a shock that is too large to be absorbed by this deformation is applied to the impact-absorbing attachment, the breakage triggering portion 34 of the breakage triggering bolt 3 breaks, thereby effectively preventing damage to the fragile base material 100. can be suppressed to

〔第２実施形態のアンカー設置構造〕
本発明による第２実施形態のアンカー設置構造も、アスファルト、レンガ、ＡＬＣ、軽量気泡コンクリート（ＡＬＣ）、低強度コンクリート等の通常のコンクリートに比べて強度が低い脆弱母材１００にアンカー１ａを設置するアンカー設置構造であり、例えば図６に示すように、アスファルト舗装等の脆弱母材１００にアンカー１ａが設置される。設置されたアンカー１ａは取付物１２０ａの取り付けに用いられ、衝撃吸収型取付物等の取付物１２０ａがアンカー１ａを介して取り付けられる。 [Anchor Installation Structure of Second Embodiment]
The anchor installation structure of the second embodiment according to the present invention also installs the anchor 1a on a fragile base material 100 having a lower strength than ordinary concrete such as asphalt, brick, ALC, lightweight cellular concrete (ALC), and low-strength concrete. This is an anchor installation structure. For example, as shown in FIG. 6, an anchor 1a is installed on a fragile base material 100 such as asphalt pavement. The installed anchor 1a is used to attach an attachment 120a, and the attachment 120a such as a shock absorbing attachment is attached via the anchor 1a.

第２実施形態のアンカー設置構造におけるアンカー１ａは、図６及び図７に示すように、外装体２ａと、破断誘発ボルト３ａとから構成される。外装体２ａも有底円筒形等の有底筒形で形成され、未硬化の定着材５が下側から内部に浸入しない形状になっていると共に、その内周に雌ねじ部２１ａが形成されている。破断誘発ボルト３ａは、軸部３２ａから構成される寸切ボルトの形状であり、軸部３２ａの外周には雄ねじ部３３ａが形成され、雄ねじ部３３ａが外装体２ａの雌ねじ部２１ａに螺合されるようになっている。 As shown in FIGS. 6 and 7, the anchor 1a in the anchor installation structure of the second embodiment is composed of an exterior body 2a and a fracture-inducing bolt 3a. The exterior body 2a is also formed in a cylindrical shape with a bottom such as a bottomed cylinder, and is shaped so as not to allow the uncured fixing material 5 to enter from below. there is The break-inducing bolt 3a has the shape of a cross-cut bolt composed of a shaft portion 32a. A male threaded portion 33a is formed on the outer periphery of the shaft portion 32a, and the male threaded portion 33a is screwed into the female threaded portion 21a of the exterior body 2a. It has become so.

破断誘発ボルト３ａには、軸部３２ａのボルト軸方向の中間位置に破断誘発部３４ａが形成され、破断誘発部３４ａはボルト軸方向の少なくとも外装体２ａへ螺合する雄ねじ部３３ａよりも低い強度で形成されている。第２実施形態でも破断誘発ボルト３ａの軸部３２ａの断面積が小さくなるように切り欠かれて破断誘発部３４ａが形成されている。第２実施形態における破断誘発部３４ａは、第１実施形態と同様に、横断面形状が略多角形の略多角柱形で形成すると良好であるが、横断面形状が略円形等の略円柱形など、略多角柱形で形成しないことも可能である。 The fracture triggering bolt 3a is formed with a fracture triggering portion 34a at an intermediate position in the bolt axial direction of the shaft portion 32a. is formed by Also in the second embodiment, the fracture triggering portion 34a is formed by notching so as to reduce the cross-sectional area of the shaft portion 32a of the fracture triggering bolt 3a. The fracture induction portion 34a in the second embodiment is preferably formed in a substantially polygonal prismatic shape having a substantially polygonal cross-sectional shape, as in the first embodiment. For example, it is also possible not to form the substantially polygonal prism shape.

上記のように、第２実施形態のアンカー設置構造では、破断誘発部３４ａは軸部３２ａよりも断面積を小さく設ければ多角柱形以外の形状に形成可能であるが、四角柱形状や六角柱形状など、外周部分に１組以上の平行面を備える形状に形成することで、破断誘発部３４ａがレンチなどの工具で把持しやすくなるので、破断誘発部３４ａで破断し外装体２ａに残った雄ねじ部３３ａを取り除く作業を容易に行うことができる。このため、破断誘発部３４ａは、四角柱や六角柱などの多角柱形状に形成することが好ましく、また、外周部分に１組の平行面を備える所謂小判型の断面形状に形成するのが好ましい。尚、破断誘発部３４ａの上記形状に関しては、第１実施形態のアンカー設置構造の破断誘発部３４においても同様である。 As described above, in the anchor installation structure of the second embodiment, the fracture induction portion 34a can be formed in a shape other than a polygonal prism shape by providing a cross-sectional area smaller than that of the shaft portion 32a. By forming a shape having one or more pairs of parallel surfaces on the outer peripheral portion, such as a columnar shape, the breakage induction portion 34a can be easily gripped with a tool such as a wrench, so that the breakage induction portion 34a is broken and remains on the exterior body 2a. This makes it easy to remove the externally threaded portion 33a. For this reason, it is preferable that the fracture inducing portion 34a is formed in a polygonal prism shape such as a square prism or a hexagonal prism, and is preferably formed in a so-called oval cross-sectional shape having a pair of parallel surfaces on the outer peripheral portion. . Note that the above-described shape of the fracture induction portion 34a is the same for the fracture induction portion 34 of the anchor installation structure of the first embodiment.

なお、破断誘発部３４ａは、望ましくは、外装体２ａへ螺合する雄ねじ部３３ａに近い側の断面積が大きくなるよう、テーパ状に形成されていることが望ましい。或いは、破断誘発部３４ａにおける外装体２ａへ螺合する雄ねじ部３３ａと逆側の雄ねじ部３３ａ（脆弱母材１００の表面から突出する雄ねじ部３３ａ）の首下近くに、若干の切込みが入っていても良い。これによれば、取付物１２０ａに衝撃力が加わったときに、破断誘発部３４ａが、下部で破断することなく確実に上部で破断するので、残った破断誘発部３４ａに工具を嵌めて、容易に取り外すことが可能となる。 In addition, it is desirable that the fracture induction portion 34a be formed in a tapered shape so that the cross-sectional area on the side closer to the male screw portion 33a that is screwed into the exterior body 2a is larger. Alternatively, a slight notch is provided near the neck of the male threaded portion 33a (the male threaded portion 33a protruding from the surface of the fragile base material 100) on the opposite side of the male threaded portion 33a screwed to the exterior body 2a in the fracture inducing portion 34a. can be According to this, when an impact force is applied to the attachment 120a, the fracture inducing portion 34a is reliably broken in the upper portion without being broken in the lower portion. can be removed.

第２実施形態のアンカー設置構造でも、図６に示すように、脆弱母材１００に形成された有底穴１１０にアンカー１ａの外装体２ａが脆弱母材１００の表面側で開放するようにして収容される。そして、取付物１２０ａを脆弱母材１００の表面に載置し、所定箇所で取付物１２０ａにワッシャー６ａを重ね、取付物１２０ａの貫通孔１２１ａ、ワッシャー６ａの貫通孔６１ａに破断誘発ボルト３ａを挿入し、挿入した破断誘発ボルト３ａの雄ねじ部３３ａを有底穴１１０に収容された外装体２ａの雌ねじ部２１ａに螺合して、破断誘発ボルト３ａが脆弱母材１００に定着される。また、ワッシャー６ａから突出する破断誘発ボルト３ａの雄ねじ部３３ａには、ワッシャー６ａの外側からナット７ａが螺合され、螺入されたナット７ａとワッシャー６ａで取付物１２０ａが脆弱母材１００側に押圧されて脆弱母材１００に固定され、取付物１２０ａがアンカー１ａで支持されて脆弱母材１００に取り付けられる。 Also in the anchor installation structure of the second embodiment, as shown in FIG. be accommodated. Then, the attachment 120a is placed on the surface of the fragile base material 100, the washer 6a is superimposed on the attachment 120a at a predetermined position, and the fracture inducing bolt 3a is inserted into the through hole 121a of the attachment 120a and the through hole 61a of the washer 6a. Then, the male threaded portion 33a of the inserted fracture inducing bolt 3a is screwed into the female threaded portion 21a of the exterior body 2a accommodated in the bottomed hole 110, thereby fixing the fracture inducing bolt 3a to the fragile base material 100. A nut 7a is screwed from the outside of the washer 6a to the externally threaded portion 33a of the fracture-inducing bolt 3a projecting from the washer 6a. It is pressed and fixed to the fragile base material 100, and the attachment 120a is attached to the fragile base material 100 while being supported by the anchors 1a.

第２実施形態のアンカー設置構造でも、有底穴１１０の空隙に定着材５が充填され、硬化した定着材５でアンカー１ａ或いは外装体２ａが脆弱母材１００に定着されている。図６の例でも、有底穴１１０内に予め定着材５の樹脂を入れておき、樹脂が注入された有底穴１１０に外装体２ａを埋設し、その後に樹脂を硬化させ、この硬化樹脂の定着材５でアンカー１ａ或いは外装体２ａが脆弱母材１００に定着されている。 Also in the anchor installation structure of the second embodiment, the fixing material 5 is filled in the voids of the bottomed holes 110 , and the anchor 1 a or the exterior body 2 a is fixed to the fragile base material 100 by the hardened fixing material 5 . In the example of FIG. 6 as well, the resin of the fixing material 5 is placed in the bottomed hole 110 in advance, the exterior body 2a is embedded in the bottomed hole 110 into which the resin is injected, and then the resin is cured. The anchor 1a or the exterior body 2a is fixed to the fragile base material 100 with the fixing material 5 of .

有底穴１１０に収容された外装体２ａに螺着された破断誘発ボルト３ａにおいて、脆弱母材１００の表面から突出する破断誘発ボルト３ａの突出部分には、ボルト軸方向の所定位置にある破断誘発部３４ａが配設される。本例では、ほぼワッシャー６ａの貫通孔６１ａ内に位置して破断誘発部３４ａが配置され、脆弱母材１００の表面と破断誘発部３４ａとの間に破断誘発ボルト３ａの雄ねじ部３３ａの一部が設けられるようになっている。 In the breakage-inducing bolt 3a screwed into the exterior body 2a accommodated in the bottomed hole 110, the protruding portion of the breakage-inducing bolt 3a protruding from the surface of the fragile base material 100 has a breaking point at a predetermined position in the bolt axial direction. An induction portion 34a is provided. In this example, the fracture inducing portion 34a is positioned substantially within the through hole 61a of the washer 6a, and a portion of the external thread portion 33a of the fracture inducing bolt 3a is located between the surface of the brittle base material 100 and the fracture inducing portion 34a. is set up.

図８に示すように、第２実施形態のアンカー設置構造で取り付けられた取付物１２０ａに衝撃力が加わり、アンカー１ａにせん断荷重Ｔが負荷された場合、脆弱母材１００の破壊や外装体２ａの損傷を生ずることなく、断面積が小さく強度が低いアンカー１ａの破断誘発部３４ａに応力が集中し、破断誘発部３４ａが図８（ａ）の白抜矢印のように破断する。また、アンカー１ａに引張荷重Ｐが負荷された場合にも、脆弱母材１００の破壊や外装体２ａの損傷を生ずることなく、アンカー１ａの破断誘発部３４ａが同様に破断する。そして、脆弱母材１００に残った破断誘発ボルト３ａは、脆弱母材１００の表面と破断誘発部３４ａとの間に露出している破断誘発ボルト３ａの雄ねじ部３３ａを工具で把持して外装体２ａから取り外し、脆弱母材１００から撤去する（図８（ｂ）参照）。尚、破断誘発部３４ａが略多角柱形である場合には、破断した破断誘発部３４ａを工具で把持して外装体２ａから取り外すことも可能である。 As shown in FIG. 8, when an impact force is applied to an attachment 120a attached by the anchor installation structure of the second embodiment, and a shear load T is applied to the anchor 1a, the fragile base material 100 is destroyed and the exterior body 2a The stress concentrates on the fracture-inducing portion 34a of the anchor 1a, which has a small cross-sectional area and low strength, and the fracture-inducing portion 34a breaks as indicated by the white arrow in FIG. 8(a). Further, even when the tensile load P is applied to the anchor 1a, the fracture induction portion 34a of the anchor 1a similarly fractures without causing destruction of the fragile base material 100 or damage to the exterior body 2a. Then, the fracture-inducing bolt 3a remaining on the brittle base material 100 is removed by gripping the male threaded portion 33a of the fracture-inducing bolt 3a exposed between the surface of the brittle base material 100 and the fracture-inducing portion 34a with a tool. 2a and removed from the fragile base material 100 (see FIG. 8(b)). In addition, when the breakage induction portion 34a has a substantially polygonal prism shape, it is also possible to grasp the broken breakage induction portion 34a with a tool and remove it from the exterior body 2a.

破断した破断誘発ボルト３ａが取り外された外装体２ａは、硬化した定着材５で脆弱母材１００に定着された状態が維持されている。そのため、破断した破断誘発ボルト３ａと異なる同一形状、同一サイズで破断していない別の破断誘発ボルト３ａを外装体２に螺着して再利用することが可能であり、定着された外装体２ａの雌ねじ部２１ａに破断した破断誘発ボルト３ａとは異なる別の破断誘発ボルト３ａの雄ねじ部３３ａを螺合して別の破断誘発ボルト３ａを取り付け、新たなアンカー１ａを構成し、アンカー設置構造を再生することが可能である。 The exterior body 2a from which the broken fracture inducing bolt 3a has been removed is maintained in a state of being fixed to the fragile base material 100 by the hardened fixing material 5. As shown in FIG. Therefore, it is possible to re-use another unbroken fracture-inducing bolt 3a having the same shape and size as the broken fracture-inducing bolt 3a by screwing it into the exterior body 2. The male threaded portion 33a of another fracture-inducing bolt 3a different from the broken fracture-inducing bolt 3a is screwed into the female threaded portion 21a of this, and another fracture-inducing bolt 3a is attached to constitute a new anchor 1a, thereby forming an anchor installation structure. It is possible to play.

第２実施形態のアンカー設置構造は、第１実施形態のアンカー設置構造と対応する構成から対応する効果を発揮することができる。また、破断誘発部３４ａが破断した際に、脆弱母材１００の表面から破断誘発ボルト３ａの雄ねじ部３３ａが突出した状態で残るため、破断誘発部３４ａの損傷度合に拘わらず、全ねじレンチ等の工具を突出した雄ねじ部３３ａにはめて容易に破断した破断誘発ボルト３ａを回転して取り外すことができる。 The anchor installation structure of the second embodiment can exhibit a corresponding effect from a configuration corresponding to that of the anchor installation structure of the first embodiment. In addition, when the fracture inducing portion 34a is broken, the external thread portion 33a of the fracture inducing bolt 3a remains in a protruding state from the surface of the fragile base material 100, so regardless of the degree of damage to the fracture inducing portion 34a, a full screw wrench or the like can be used. The broken break-inducing bolt 3a can be easily rotated and removed by fitting the tool to the protruding male threaded portion 33a.

〔第３実施形態のアンカー設置構造〕
本発明による第３実施形態のアンカー設置構造も、通常のコンクリートに比べて強度が低い脆弱母材１００にアンカー１ｂを設置するアンカー設置構造であり、例えば図９に示すように、アスファルト舗装等の脆弱母材１００にアンカー１ｂが設置される。設置されたアンカー１ｂは取付物の取り付けに用いられ、衝撃吸収型取付物等の取付物がアンカー１ｂを介して取り付けられる。 [Anchor installation structure of the third embodiment]
The anchor installation structure of the third embodiment according to the present invention is also an anchor installation structure in which an anchor 1b is installed in a fragile base material 100 having a lower strength than ordinary concrete. For example, as shown in FIG. An anchor 1 b is installed on the fragile base material 100 . The installed anchor 1b is used for attaching an attachment, and an attachment such as a shock absorbing attachment is attached via the anchor 1b.

第３実施形態のアンカー設置構造におけるアンカー１ｂは、図９に示すように、外装体２ｂと、破断誘発ボルト３ｂとから構成される。外装体２ｂは、略有底円筒形等の略有底筒形で形成され、未硬化の定着材５が下側から内部に浸入しない形状になっていると共に、底部に截頭円錐形等の底に向かって漸次拡径するテーパ部２２ｂが形成されている。外装体２ｂは、テーパ部２２ｂにより、定着材５に埋設された状態でアンカー効果を発揮できるようになっている。外装体２ｂの内周には雌ねじ部２１ｂが形成されている。 As shown in FIG. 9, the anchor 1b in the anchor installation structure of the third embodiment is composed of an exterior body 2b and a fracture inducing bolt 3b. The exterior body 2b is formed in a substantially cylindrical shape with a bottom, such as a cylindrical shape with a bottom. A tapered portion 22b whose diameter gradually increases toward the bottom is formed. The tapered portion 22b of the exterior body 2b allows the exterior body 2b to exert an anchoring effect while being embedded in the fixing material 5. As shown in FIG. A female threaded portion 21b is formed on the inner periphery of the exterior body 2b.

破断誘発ボルト３ｂは、軸部３２ｂから構成される寸切ボルトの形状であり、軸部３２ｂの外周には雄ねじ部３３ｂが形成され、雄ねじ部３３ｂが外装体２ｂの雌ねじ部２１ｂに螺合されるようになっている。破断誘発ボルト３ｂには、軸部３２ｂのボルト軸方向の中間位置で脆弱母材１００と逆側に寄った位置には破断誘発部３４ｂが形成され、破断誘発部３４ｂはボルト軸方向の前後の位置よりも低い強度で形成されている。破断誘発部３４ｂの構成は第２実施形態における破断誘発部３４ａの構成と同一である。 The break-inducing bolt 3b has the shape of a cross-cut bolt composed of a shaft portion 32b. A male threaded portion 33b is formed on the outer periphery of the shaft portion 32b, and the male threaded portion 33b is screwed into the female threaded portion 21b of the exterior body 2b. It has become so. In the fracture inducing bolt 3b, a fracture inducing portion 34b is formed at a position in the middle of the shaft portion 32b in the axial direction of the bolt and located on the opposite side of the fragile base material 100. The fracture inducing portion 34b extends in the longitudinal direction of the bolt. It is formed with a lower strength than the position. The configuration of the fracture induction portion 34b is the same as the configuration of the fracture induction portion 34a in the second embodiment.

第３実施形態のアンカー設置構造では、脆弱母材１００から脆弱母材１００より深い位置にある深層１３０まで形成された有底穴１４０にアンカー１ｂの外装体２ｂが収容され、外装体２ｂは脆弱母材１００の表面側で開放するようにして収容される。そして、図示省略する取付物、ワッシャーに破断誘発ボルト３ｂを挿入し、挿入した破断誘発ボルト３ｂの雄ねじ部３３ｂを有底穴１４０に収容された外装体２ｂの雌ねじ部２１ｂに螺合して、破断誘発ボルト３ｂが脆弱母材１００及び土などの深層１３０に定着される。また、ワッシャーから突出する破断誘発ボルト３ｂの雄ねじ部３３ｂには、図示省略するナットが螺合され、螺入されたナットとワッシャーで取付物が脆弱母材１００側に押圧されて脆弱母材１００に固定され、取付物がアンカー１ｂで支持されて脆弱母材１００に取り付けられる。 In the anchor installation structure of the third embodiment, the exterior body 2b of the anchor 1b is accommodated in the bottomed hole 140 formed from the fragile base material 100 to the deep layer 130 at a position deeper than the fragile base material 100, and the exterior body 2b is fragile. It is housed so as to open on the surface side of the base material 100 . Then, the breakage triggering bolt 3b is inserted into an attachment (not shown) and a washer, and the male threaded portion 33b of the inserted fracture triggering bolt 3b is screwed into the female threaded portion 21b of the exterior body 2b accommodated in the bottomed hole 140, A fracture-inducing bolt 3b is fixed to a brittle base material 100 and a deep layer 130 such as soil. A nut (not shown) is screwed onto the externally threaded portion 33b of the fracture triggering bolt 3b protruding from the washer, and the attached object is pressed toward the fragile base material 100 by the screwed nut and washer. , and the attachment is supported by the anchor 1b and attached to the fragile base material 100. As shown in FIG.

第３実施形態のアンカー設置構造では、有底穴１４０の空隙に定着材５が充填され、硬化した定着材５でアンカー１ｂ或いは外装体２ｂが脆弱母材１００と深層１３０に定着されている。図９の例では、有底穴１４０内に予め定着材５の樹脂を入れておき、樹脂が注入された有底穴１４０に外装体２ｂを埋設し、その後に樹脂を硬化させ、この硬化樹脂の定着材５でアンカー１ｂ或いは外装体２ｂが脆弱母材１００と深層１３０に定着されている。 In the anchor installation structure of the third embodiment, the gap of the bottomed hole 140 is filled with the fixing material 5 , and the anchor 1 b or the exterior body 2 b is fixed to the fragile base material 100 and the deep layer 130 with the hardened fixing material 5 . In the example of FIG. 9, the resin of the fixing material 5 is placed in the bottomed hole 140 in advance, the exterior body 2b is embedded in the bottomed hole 140 into which the resin is injected, and then the resin is cured. The anchor 1b or the exterior body 2b is fixed to the fragile base material 100 and the deep layer 130 with the fixing material 5 of .

有底穴１４０に収容された外装体２ｂに螺着された破断誘発ボルト３ｂにおいて、脆弱母材１００の表面から突出する破断誘発ボルト３ｂの突出部分には、ボルト軸方向の所定位置にある破断誘発部３４ｂが配設されると共に、脆弱母材１００の表面と破断誘発部３４ｂとの間に破断誘発ボルト３ｂの雄ねじ部３３ｂの一部が設けられるようになっている。 In the breakage-inducing bolt 3b screwed into the exterior body 2b accommodated in the bottomed hole 140, the protruding portion of the breakage-inducing bolt 3b protruding from the surface of the fragile base material 100 has a breaking point at a predetermined position in the bolt axial direction. A triggering portion 34b is provided, and a part of the male threaded portion 33b of the fracture triggering bolt 3b is provided between the surface of the brittle base material 100 and the fracture triggering portion 34b.

第３実施形態のアンカー設置構造で取り付けられた取付物に衝撃力が加わった際の破断誘発ボルト３ｂの破断誘発部３４ｂの破断、破断した破断誘発ボルト３ｂの取り外し、硬化した定着材５で脆弱母材１００に定着された状態が維持されている外装体２ｂの再利用についての構成は、第２実施形態のアンカー設置構造における構成と同一である。 Fracture of the fracture inducing part 34b of the fracture inducing bolt 3b when an impact force is applied to the attached object attached by the anchor installation structure of the third embodiment, removal of the fractured fracture inducing bolt 3b, and fragility due to the hardened fixing material 5 The configuration for reuse of the exterior body 2b that is maintained fixed to the base material 100 is the same as the configuration in the anchor installation structure of the second embodiment.

第３実施形態のアンカー設置構造は、第２実施形態のアンカー設置構造と対応する構成から対応する効果を発揮することができる。また、外装体２ｂのテーパ部２２ｂにより、定着材５に埋設された状態でアンカー効果を発揮することができ、外装体２ｂの抜け出し、外装体２ｂと定着材５で構成される定着部の損傷をより確実に防止することができる。 The anchor installation structure of the third embodiment can exhibit a corresponding effect from a configuration corresponding to that of the anchor installation structure of the second embodiment. In addition, the tapered portion 22b of the exterior body 2b can exert an anchoring effect in a state of being embedded in the fixing material 5, and the exterior body 2b can come off and damage the fixing portion composed of the exterior body 2b and the fixing material 5. can be prevented more reliably.

〔第４実施形態のアンカー設置構造〕
本発明による第４実施形態のアンカー設置構造も、通常のコンクリートに比べて強度が低い脆弱母材１００にアンカー１ｃを設置するアンカー設置構造であり、例えば図１０に示すように、アスファルト舗装等の脆弱母材１００にアンカー１ｃが設置される。設置されたアンカー１ｃは取付物の取り付けに用いられ、衝撃吸収型取付物等の取付物がアンカー１ｃを介して取り付けられる。 [Anchor Installation Structure of Fourth Embodiment]
The anchor installation structure of the fourth embodiment according to the present invention is also an anchor installation structure in which an anchor 1c is installed in a fragile base material 100 having a lower strength than ordinary concrete. For example, as shown in FIG. An anchor 1 c is installed on the fragile base material 100 . The installed anchor 1c is used for attaching an attachment, and an attachment such as a shock absorbing attachment is attached via the anchor 1c.

第４実施形態のアンカー設置構造におけるアンカー１ｃは、図１０に示すように、外装体２ｃと、パイプ体８ｄと、第３実施形態における破断誘発ボルト３ｂと同一構成の軸部３２ｃ、雄ねじ部３３ｃ、破断誘発部３４ｃを有する破断誘発ボルト３ｃとから構成される。パイプ体８ｄの内径は、破断誘発ボルト３ｃの外径より僅かに大きく構成されている。外装体２ｃは、略有底円筒形等の略有底筒形で形成されると共に、外周面が底と逆側に向かって漸次拡径するテーパ面２３ｃになっており、開放側の基面２４ｃの面積が通常の筒形の対応する箇所の面積よりも大きく形成されている。外装体２ｃは、大きく広がった基面２４ｃにより、アンカー効果を発揮できるようになっている。外装体２ｃの内周には雌ねじ部２１ｃが形成されている。 As shown in FIG. 10, the anchor 1c in the anchor installation structure of the fourth embodiment includes an exterior body 2c, a pipe body 8d, and a shaft portion 32c and a male thread portion 33c having the same configuration as the fracture inducing bolt 3b in the third embodiment. , and a break-inducing bolt 3c having a break-inducing portion 34c. The inner diameter of the pipe body 8d is slightly larger than the outer diameter of the breakage inducing bolt 3c. The exterior body 2c is formed in a substantially bottomed cylindrical shape such as a substantially bottomed cylindrical shape, and the outer peripheral surface is a tapered surface 23c that gradually expands in diameter toward the opposite side of the bottom. The area of 24c is formed larger than the area of the normal cylindrical corresponding portion. The exterior body 2c exhibits an anchoring effect due to the greatly expanded base surface 24c. A female threaded portion 21c is formed on the inner periphery of the exterior body 2c.

第４実施形態のアンカー設置構造では、脆弱母材１００から脆弱母材１００より深い位置にある深層１３０まで形成された有底穴１４０にアンカー１ｃの外装体２ｃが収容され、外装体１ｃは脆弱母材１００の表面側で開放するようにして収容される。外装体２ｃの収容は、例えば深層１３０に外装体２ｃの形状と大きさに略対応する有底穴１４０の一部を形成して外装体２ｃを収容し、その後にアスファルト舗装等の脆弱母材１００を深層１３０の上に形成し、脆弱母材１００の収容された外装体２ｃに対応する位置に有底穴１４０の残部を基面２４ｃの外周縁よりも小径のパイプ体８ｄを配置することによって形成する等により行う。なお、パイプ体８ｄの外周面の周囲の脆弱母材１００に定着材５が注入すると良好であるが、定着材５を注入しないことも可能である。 In the anchor installation structure of the fourth embodiment, the exterior body 2c of the anchor 1c is accommodated in the bottomed hole 140 formed from the fragile base material 100 to the deep layer 130 at a position deeper than the fragile base material 100, and the exterior body 1c is fragile. It is housed so as to open on the surface side of the base material 100 . For housing the exterior body 2c, for example, a portion of a bottomed hole 140 substantially corresponding to the shape and size of the exterior body 2c is formed in the deep layer 130 to house the exterior body 2c. 100 is formed on the deep layer 130, and a pipe body 8d having a smaller diameter than the outer peripheral edge of the base surface 24c is arranged in the remaining portion of the bottomed hole 140 at a position corresponding to the exterior body 2c in which the fragile base material 100 is accommodated. It is formed by, for example, Although it is preferable to inject the fixing material 5 into the fragile base material 100 around the outer peripheral surface of the pipe body 8d, it is also possible not to inject the fixing material 5. FIG.

そして、図示省略する取付物、ワッシャーに破断誘発ボルト３ｃを挿入し、挿入した破断誘発ボルト３ｃの雄ねじ部３３ｃを有底穴１４０に収容されたパイプ体８ｄの内部を通して外装体２ｃの雌ねじ部２１ｃに螺合して、破断誘発ボルト３ｃが脆弱母材１００及びコンクリートなどの深層１３０に定着される。また、ワッシャーから突出する破断誘発ボルト３ｃの雄ねじ部３３ｃには、図示省略するナットが螺合され、螺入されたナットとワッシャーで取付物が脆弱母材１００側に押圧されて脆弱母材１００に固定され、取付物がアンカー１ｃで支持されて脆弱母材１００に取り付けられる。 Then, the fracture-inducing bolt 3c is inserted into an attachment (not shown) and a washer, and the male threaded portion 33c of the inserted fracture-inducing bolt 3c is passed through the inside of the pipe body 8d accommodated in the bottomed hole 140, and the female threaded portion 21c of the exterior body 2c. , and the breakage-inducing bolt 3c is fixed to the fragile base material 100 and the deep layer 130 such as concrete. A nut (not shown) is screwed onto the externally threaded portion 33c of the break-inducing bolt 3c projecting from the washer, and the attached object is pressed toward the fragile base material 100 by the screwed nut and washer. , and the attached object is attached to the fragile base material 100 while being supported by the anchor 1c.

第４実施形態のアンカー設置構造では、外装体２ｃが深層１３０に位置し、基面２４ｃの外周縁より小径で脆弱母材１００に配置するパイプ体８ｄによって拘束されることにより脆弱母材１００に定着されている。図１０の例では、破断誘発ボルト３ｃの雄ねじ部３３ｃを有底穴１４０に収容された外装体２ｃの雌ねじ部２１ｃに螺合する一方、脆弱母材１００に配置したパイプ体８ｄの周囲には脆弱母材１００の空隙を埋めると共にパイプ体８ｄを脆弱母材１００に定着させる樹脂が注入され、この硬化樹脂の定着材５により脆弱母材１００に定着されたパイプ体８ｄに拘束された深層１３０の外装体２ｃの移動が阻止され、アンカー１ｃが脆弱母材１００と深層１３０又は脆弱母材１００に定着されている。 In the anchor installation structure of the fourth embodiment, the exterior body 2c is located in the deep layer 130, and is constrained by the pipe body 8d arranged on the fragile base material 100 with a smaller diameter than the outer peripheral edge of the base surface 24c. It is established. In the example of FIG. 10, while the male threaded portion 33c of the fracture triggering bolt 3c is screwed into the female threaded portion 21c of the exterior body 2c accommodated in the bottomed hole 140, around the pipe body 8d arranged on the fragile base material 100, A deep layer 130 is bound to the pipe body 8d fixed to the fragile base material 100 by the fixing material 5 of the cured resin, which fills the voids of the fragile base material 100 and fixes the pipe body 8d to the fragile base material 100. The movement of the exterior body 2c is blocked, and the anchor 1c is fixed to the fragile base material 100 and the deep layer 130 or to the fragile base material 100.例文帳に追加

有底穴１４０に収容された外装体２ｃに螺着された破断誘発ボルト３ｃにおいて、脆弱母材１００の表面から突出する破断誘発ボルト３ｃの突出部分には、ボルト軸方向の所定位置にある破断誘発部３４ｃが配設されると共に、脆弱母材１００の表面と破断誘発部３４ｃとの間に破断誘発ボルト３ｃの雄ねじ部３３ｃの一部が設けられる。第４実施形態のアンカー設置構造で取り付けられた取付物に衝撃力が加わった際の破断誘発ボルト３ｃの破断誘発部３４ｃの破断の構成は、第３実施形態のアンカー設置構造における構成と同一である。 In the breakage-inducing bolt 3c screwed into the exterior body 2c accommodated in the bottomed hole 140, the protruding portion of the breakage-inducing bolt 3c protruding from the surface of the fragile base material 100 has a breaking point at a predetermined position in the bolt axial direction. A triggering portion 34c is provided, and a portion of the male threaded portion 33c of the fracture triggering bolt 3c is provided between the surface of the brittle base material 100 and the fracture triggering portion 34c. The structure for breaking the breakage inducing portion 34c of the breakage inducing bolt 3c when an impact force is applied to the attached object in the anchor installation structure of the fourth embodiment is the same as the structure in the anchor installation structure of the third embodiment. be.

第４実施形態のアンカー設置構造は、第２実施形態のアンカー設置構造と対応して備える構成から対応する効果を発揮することができる。また、外装体２ｃの基面２４ｃが脆弱母材１００に配置しているパイプ体８ｄに拘束されることにより、アンカー効果を発揮することができる。 The anchor installation structure of the fourth embodiment can exhibit the corresponding effect from the configuration corresponding to the anchor installation structure of the second embodiment. In addition, since the base surface 24c of the exterior body 2c is restrained by the pipe body 8d arranged on the fragile base material 100, an anchor effect can be exhibited.

〔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追加内容や変形例も含まれる。 [Scope of invention disclosed in this specification]
In addition to each invention and each embodiment listed as an invention, the invention disclosed in this specification is specified by changing these partial contents to other contents disclosed in this specification within the applicable range , or those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting these partial contents to the extent that partial effects can be obtained and making them general concepts encompasses The invention disclosed in this specification also includes the following additional contents and modifications.

例えば第１～第３実施形態では、有底穴１１０、１４０の空隙に定着材５を充填し、硬化した定着材５でアンカー１、１ａ、１ｂ、１ｃや外装体２、２ａ、２ｂを定着する構造としたが、例えば外装体の先端の拡開片を拡開させて有底穴の周壁に食い込ませ、外装体を機械定着させ、外装体の後部の雌ねじ部に破断誘発ボルトを螺着する構成など、本発明には定着材を用いずにアンカーや外装体を定着する構成も含まれる。 For example, in the first to third embodiments, the gaps of the bottomed holes 110 and 140 are filled with the fixing material 5, and the anchors 1, 1a, 1b, and 1c and the exterior bodies 2, 2a, and 2b are fixed with the cured fixing material 5. For example, the expansion piece at the tip of the exterior body is expanded to bite into the peripheral wall of the bottomed hole, the exterior body is fixed mechanically, and the fracture-inducing bolt is screwed into the female threaded portion at the rear of the exterior body. The present invention also includes a configuration for fixing an anchor or an exterior body without using a fixing material.

また、第１～４実施形態では、工具で把持し易くする好適な構成として、破断誘発部３４等を多角柱形状や断面小判型形状に形成したが、工具で把持し易くする構成はこれに限るものではない。例えば、レンチなどで把持しやすい平行面を外周部分に有する部位を破断誘発部とは別に形成して破断誘発部より外装体側に配置してもよい。この場合には、この平行面を設けた部位を、外装体の表面から突出する位置に配置するようにする。 In addition, in the first to fourth embodiments, as a suitable configuration for facilitating gripping with a tool, the fracture induction portion 34 and the like are formed in a polygonal columnar shape or an oval cross-sectional shape, but the configuration for facilitating gripping with a tool is this. It is not limited. For example, a portion having a parallel surface on the outer peripheral portion that can be easily gripped with a wrench or the like may be formed separately from the breakage induction portion and arranged closer to the exterior body than the breakage induction portion. In this case, the portion provided with the parallel surfaces is arranged at a position protruding from the surface of the exterior body.

また、本発明における破断誘発部には、ボルト軸方向の所定位置に設けられる、少なくとも外装体へ螺合する雄ねじ部よりも強度が低い適宜の破断誘発部が含まれ、例えば強度の低い別材料で破断誘発部を形成する構成、破断誘発部或いはその前後を改質して破断誘発部の強度を低下させる構成等とすることも可能であり、軸部の断面積が小さくなるように切り欠き状に形成された破断誘発部に限定されない。また、本発明には、定着した外装体の雌ねじ部に破断した破断誘発ボルトとは異なる破断誘発ボルトの雄ねじ部を螺合して再利用することができない構成も含まれる。 Further, the break-inducing portion in the present invention includes an appropriate break-inducing portion which is provided at a predetermined position in the axial direction of the bolt and has a lower strength than at least the external thread portion screwed into the exterior body. It is also possible to have a configuration in which the fracture-inducing portion is formed with, or a configuration in which the strength of the fracture-inducing portion is reduced by modifying the fracture-inducing portion or before and after it. It is not limited to a break-inducing portion formed in a shape. In addition, the present invention also includes a configuration in which the male threaded portion of a fracture inducing bolt different from the fractured fracture inducing bolt is screwed into the female threaded portion of the exterior body that has been fixed so that it cannot be reused.

本発明は、例えばアスファルト等の脆弱母材に防護柵等の取付物をアンカーを介して取り付ける際に利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be used, for example, when attaching an attachment such as a protective fence to a fragile base material such as asphalt through an anchor.

１、１ａ、１ｂ、１ｃ…アンカー２、２ａ、２ｂ、２ｃ…外装体２１、２１ａ、２１ｂ、２１ｃ…雌ねじ部２２ｂ…テーパ部２３ｃ…テーパ面２４ｃ…基面３、３ａ、３ｂ、３ｃ…破断誘発ボルト３１…頭部３２、３２ａ、３２ｂ、３２ｃ…軸部３３、３３ａ、３３ｂ、３３ｃ…雄ねじ部３４、３４ａ、３４ｂ、３４ｃ…破断誘発部４…ワッシャー４１…貫通孔５…定着材６ａ…ワッシャー６１ａ…貫通孔７ａ…ナット８ｄ…パイプ体１００…脆弱母材１１０、１４０…有底穴１２０、１２０ａ…取付物１２１、１２１ａ…貫通孔１３０…深層２００…アンカー２１０…スリーブ２１１…雌ねじ２２０…寸切ボルト２２１…雄ねじ２３０…脆弱母材２３１…有底穴２４０…接着材Ｐ…引張荷重Ｔ…せん断荷重
1, 1a, 1b, 1c... Anchor 2, 2a, 2b, 2c... Exterior body 21, 21a, 21b, 21c... Female screw part 22b... Tapered part 23c... Tapered surface 24c... Base surface 3, 3a, 3b, 3c... Fracture Induction bolt 31 Head 32, 32a, 32b, 32c Shaft 33, 33a, 33b, 33c Male screw 34, 34a, 34b, 34c Fracture induction 4 Washer 41 Through hole 5 Fixing material 6a Washer 61a... Through hole 7a... Nut 8d... Pipe body 100... Fragile base material 110, 140... Bottomed hole 120, 120a... Attachment 121, 121a... Through hole 130... Deep layer 200... Anchor 210... Sleeve 211... Female screw 220... Cut bolt 221 Male screw 230 Fragile base material 231 Bottomed hole 240 Adhesive material P Tensile load T Shear load

Claims

An installation structure in which an anchor is installed on a fragile base material, comprising an outer body having a female threaded portion on the inner periphery and a fracture-inducing bolt having a male threaded portion formed on the outer periphery that is screwed into the female threaded portion of the outer body. There is
An uncured fixing material does not enter the bottomed hole formed in the brittle base material or the bottomed hole formed from the brittle base material to a deep layer at a position deeper than the brittle base material from below. The exterior body formed in the shape of a bottom cylinder is accommodated,
The fixing material is filled in the gap of the bottomed hole, and the exterior body is fixed to the fragile base material by the cured fixing material,
The male threaded portion of the fracture inducing bolt is screwed into the female threaded portion of the exterior body, and the fracture inducing bolt is fixed to the fragile base material,
A break-inducing portion having a lower strength than at least the male threaded portion screwed into the exterior body is provided at a predetermined position in the bolt axial direction of the protruding portion of the break-inducing bolt that protrudes from the surface of the fragile base material. An anchor installation structure characterized by:

The breakage triggering portion is formed in a notch shape so that the cross-sectional area of the shaft portion of the breakage triggering bolt is reduced and is formed in a substantially polygonal columnar shape,
2. The anchor installation structure according to claim 1, wherein the broken and exposed substantially polygonal prism-shaped break-inducing portion can be gripped by a tool.

3. The anchor installation structure according to claim 1, wherein a male threaded portion of said fracture inducing bolt is provided between the surface of said fragile base material and said fracture inducing portion.

In the anchor installation structure according to any one of claims 1 to 3 , when the breakage-inducing bolt breaks at the breakage-inducing portion, the remaining portion of the breakage-inducing bolt broken at the breakage-inducing portion is removed from the exterior body. ,
A method for regenerating an anchor installation structure, characterized by screwing and attaching another break-inducing bolt to the exterior body remaining after removing the remaining portion.

An installation structure for a shock absorbing attachment installed via the anchor of the anchor installation structure according to any one of claims 1 to 3 ,
The impact-absorbing attachment is provided so as to absorb the impact by deformation, and the deformation of the impact-absorbing attachment occurs with a force smaller than the force that breaks the breakage triggering portion of the breakage triggering bolt. Installation structure of a shock absorption type attachment, characterized in that it is provided in