JP5050983B2 - Post-bonding anchor bolt construction method - Google Patents
Post-bonding anchor bolt construction method Download PDFInfo
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- JP5050983B2 JP5050983B2 JP2008113643A JP2008113643A JP5050983B2 JP 5050983 B2 JP5050983 B2 JP 5050983B2 JP 2008113643 A JP2008113643 A JP 2008113643A JP 2008113643 A JP2008113643 A JP 2008113643A JP 5050983 B2 JP5050983 B2 JP 5050983B2
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- 238000010276 construction Methods 0.000 title claims description 11
- 239000000853 adhesive Substances 0.000 claims description 51
- 230000001070 adhesive effect Effects 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 13
- 239000004744 fabric Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000002775 capsule Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 230000009970 fire resistant effect Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
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- Joining Of Building Structures In Genera (AREA)
Description
この発明は、既存のコンクリート構造物に対してあと付け施工で設置する接着系あと施工アンカーボルトの施工方法に関する。 The present invention relates to a method for constructing an adhesive post-installed anchor bolt that is installed by retrofitting to an existing concrete structure.
住宅の基礎に用いられるアンカーボルトとしては、コンクリートの打設に先立って設置する先付けアンカーが一般的であるが、近年の増築や改築の需要増加に伴って、耐震補強用や補修用その他の各種部材を取り付けるために、既存の基礎に対してあと付けで設置するあと付けアンカーの必要性が高まってきている。この種のあと施工アンカーは、例えば金属拡張アンカーと接着系アンカーとに大別される。 As anchor bolts used for housing foundations, pre-installed anchors are generally installed prior to placing concrete. However, with the recent increase in demand for extension and renovation, various other types such as those for seismic reinforcement and repair are proposed. In order to attach the members, there is an increasing need for retrofit anchors that are retrofitted to existing foundations. This type of post-installed anchor is roughly classified into, for example, a metal expansion anchor and an adhesive anchor.
金属拡張アンカーは、既存のコンクリート構造物に穿設したボルト埋込用孔に挿入して、打撃又は締付けによって拡張部を拡張させてボルト埋込用孔の孔壁に食い込ませることで、既存のコンクリート構造物に機械的に固着するようになっている。また、接着系アンカーは、既存のコンクリート構造物に穿設したボルト埋込用孔に挿入して、そのボルト埋込用孔に充填した接着剤の硬化によって、既存のコンクリート構造物に物理的に固着するようになっている。 The metal expansion anchor is inserted into a bolt embedding hole drilled in an existing concrete structure, and the expanded portion is expanded by striking or tightening to penetrate the hole wall of the bolt embedding hole. It is designed to mechanically adhere to the concrete structure. An adhesive anchor is physically inserted into an existing concrete structure by being inserted into a bolt embedding hole drilled in an existing concrete structure and curing the adhesive filled in the bolt embedding hole. It comes to stick.
一般に、住宅の基礎においては、アンカーボルト周りのコンクリート被り厚さが比較的薄いことから、あと施工アンカーとして上記の金属拡張アンカーを用いた場合、打撃や締付けによる拡張部の食い込みによって、基礎にひび割れが発生し易く、引抜耐力を安定して得ることができない恐れがあった。このため、住宅の基礎に設置するあと施工アンカーとしては、接着系アンカーを用いることが多くなっている。 Generally, in concrete foundations, the concrete covering around the anchor bolt is relatively thin, so when using the above metal expansion anchor as a post-construction anchor, the foundation cracks due to the biting of the expansion part by striking or tightening. May occur, and there is a possibility that the drawing strength cannot be obtained stably. For this reason, adhesive anchors are often used as post-installed anchors installed on the foundations of houses.
このような接着系アンカーの固着に使用する接着剤としては、例えば特許文献１に開示されているようなモルタル等の無機系接着剤と、特許文献２に開示されているようなエポキシ樹脂等の有機系接着剤とがあるが、一般に無機系接着剤を使用した場合には、有機系接着剤を使用した場合と比べて接着力が弱く、十分な引抜耐力が得られないことがある。このため、住宅の基礎への接着系アンカーの設置に際しては、十分な引抜耐力を確保することが可能な有機系接着剤を使用することが多かった。 As an adhesive used for fixing such an adhesive anchor, for example, an inorganic adhesive such as mortar disclosed in Patent Document 1 and an epoxy resin disclosed in Patent Document 2 are used. Although there are organic adhesives, generally, when an inorganic adhesive is used, the adhesive strength is weaker than when an organic adhesive is used, and sufficient pulling strength may not be obtained. For this reason, when installing an adhesive anchor on the foundation of a house, an organic adhesive that can ensure sufficient pulling strength is often used.
しかしながら、有機系接着剤を使用して接着系アンカーを設置する場合、以下のような欠点を有していた。すなわち、有機系接着剤は火や熱に弱いことから、単に有機系接着剤をボルト埋込用孔に充填しているだけで、有機系接着剤が基礎表面（天端面）に露出した状態となっていると、火災等が発生した場合、その火や熱の影響により有機系接着剤が変形したり、場合によっては燃えてなくなる恐れがあり、引抜耐力が大幅に低下してしまうといった危険性があった。 However, when an adhesive anchor is installed using an organic adhesive, it has the following drawbacks. In other words, since organic adhesives are vulnerable to fire and heat, simply filling the holes for embedding bolts with organic adhesives exposes the organic adhesive to the base surface (top end face). If there is a fire, etc., there is a risk that the organic adhesive may be deformed due to the influence of the fire or heat, or may not burn in some cases, and the pulling-out resistance will be greatly reduced was there.
そこで、この発明は、上記の問題点を解消して、火災等が発生しても、その火や熱の影響を受けることなく十分な引抜耐力を維持することができる有機系接着剤を使用した接着系あと施工アンカーボルトの施工方法の提供を目的とする。 Therefore, the present invention uses an organic adhesive that solves the above-described problems and can maintain sufficient pulling strength without being affected by the fire or heat even if a fire or the like occurs. The purpose is to provide a method for installing anchor bolts for post-bonding.
上記課題を解決するため、この発明の接着系あと施工アンカーボルトの施工方法は、コンクリート構造物１のボルト埋込用孔４の開口４ａ付近に、その孔径を大とする大径部５を形成し、前記ボルト埋込用孔４に有機系接着剤１０を充填して、そのボルト埋込用孔４に挿入したアンカーボルト１１を前記有機系接着剤１０の硬化によって前記コンクリート構造物１に固定するとともに、前記ボルト埋込用孔４の大径部５に耐火性を有するセメント系材料１２を流し込んで、前記有機系接着剤１０を前記コンクリート構造物１の表面に露出させないように被覆したことを特徴としている。 In order to solve the above problems, the post-installation anchor bolt construction method of the present invention forms a large-diameter portion 5 having a large hole diameter in the vicinity of the opening 4a of the bolt embedding hole 4 of the concrete structure 1. Then, the organic adhesive 10 is filled in the bolt embedding hole 4, and the anchor bolt 11 inserted into the bolt embedding hole 4 is fixed to the concrete structure 1 by the curing of the organic adhesive 10. In addition, a cement-based material 12 having fire resistance is poured into the large-diameter portion 5 of the bolt embedding hole 4 to coat the organic adhesive 10 so as not to be exposed on the surface of the concrete structure 1. It is characterized by.
さらに、前記ボルト埋込用孔４の開口４ａから前記有機系接着剤１０までの前記セメント系材料１２の被覆部分の長さ寸法Ｌ２を、前記コンクリート構造物１に埋設した鉄筋のコンクリート被り厚さ寸法と同等かそれよりも大きくしている。 Further, the length L2 of the covering portion of the cement material 12 from the opening 4a of the bolt embedding hole 4 to the organic adhesive 10 is the concrete covering thickness of the reinforcing bar embedded in the concrete structure 1. It is equal to or larger than the dimensions.
さらにまた、前記アンカーボルト１１を、建物の布基礎１の立ち上がり部２に固定している。 Furthermore, the anchor bolt 11 is fixed to the rising part 2 of the fabric foundation 1 of the building.
この発明の接着系あと施工アンカーボルトの施工方法においては、ボルト埋込用孔の開口付近に耐火性を有するセメント系材料を流し込んで、ボルト埋込用孔に充填した有機系接着剤をコンクリート構造物の表面に露出させないように被覆しているので、アンカーボルトの引抜耐力を十分に確保することが可能な有機系接着剤を使用してアンカーボルトを固定しながら、火災等が発生した場合でも、その火や熱による有機系接着剤の焼失、変形を防止して、アンカーボルトの引抜耐力を良好に維持することができる。 In the adhesive post-installation anchor bolt construction method of the present invention, a cement-based material having fire resistance is poured in the vicinity of the opening of the bolt embedding hole, and the organic adhesive filled in the bolt embedding hole is applied to the concrete structure. Even if a fire or the like occurs while fixing the anchor bolt using an organic adhesive that can sufficiently secure the pull-out strength of the anchor bolt, it is covered so that it is not exposed on the surface of the object. The organic adhesive can be prevented from being burned out and deformed by the fire or heat, and the pull-out strength of the anchor bolt can be maintained well.
しかも、セメント系材料の流し込みによって有機系接着剤を被覆しているので、ボルト埋込用孔の開口付近に耐火部材を嵌め込んで被覆する場合と比べて、専用部材を別途必要とすることなく、またボルト埋込用孔の寸法精度等も要求されることなく、さらにコンクリート構造物にも容易に馴染ませることができ、これによって施工性を向上して、施工費の低減を図ることができる。 Moreover, since the organic adhesive is coated by pouring cementitious material, a special member is not required compared to the case where a fire-resistant member is fitted near the opening of the bolt embedding hole. In addition, dimensional accuracy of the bolt embedding hole is not required, and it can be easily adapted to a concrete structure, thereby improving workability and reducing construction costs. .
さらに、ボルト埋込用孔の開口付近に大径部を形成することで、セメント系材料を簡単に流し込むことができ、施工性をより一層向上することができる。 Furthermore, by forming the large diameter portion in the vicinity of the opening of the bolt embedding hole, the cementitious material can be easily poured, and the workability can be further improved.
さらにまた、セメント系材料の被覆部分の長さ寸法を、コンクリート構造物に埋設した鉄筋のコンクリート被り厚さ寸法と同等かそれ以上とすることで、有機系接着剤の焼失、変形等を確実に防止することができ、信頼性をより一層向上することができる。 Furthermore, by making the length of the cemented material covering part equal to or greater than the concrete cover thickness of the reinforcing steel embedded in the concrete structure, it is possible to ensure that the organic adhesive is burned out and deformed. Can be prevented, and the reliability can be further improved.
以下、この発明の一実施形態に係る接着系あと施工アンカーボルトの施工方法について、その施工手順に従って説明する。なお、この実施形態においては、住宅の布基礎の立ち上がり部に対して接着系あと施工アンカーボルト（以下、単に「アンカーボルト」と称する。）を施工する場合を例に挙げて説明するが、この発明の施工方法は、住宅の布基礎以外のコンクリート構造物に対しても適用可能である。 Hereinafter, the construction method of the adhesive post-installed anchor bolt according to one embodiment of the present invention will be described according to the construction procedure. In this embodiment, the case where an adhesive post-installed anchor bolt (hereinafter simply referred to as “anchor bolt”) is applied to the rising portion of the fabric foundation of the house will be described as an example. The construction method of the invention can be applied to a concrete structure other than a cloth foundation of a house.
まず、図１に示すように、住宅の布基礎１の立ち上がり部２において、その天端面３から所定深さのボルト埋込用孔４をドリル等を用いて掘削する。このボルト埋込用孔４は、その開口４ａ付近に孔径を大とする大径部５が形成され、この大径部５よりも下側が小径部６となっている。なお、このボルト埋込用孔４の形成に際しては、大径部５を穿孔してから、その底部中央から下方へ向けて小径部６を穿孔するか、或いは、小径部６を穿孔してから、その開口４ａ付近を拡張するように大径部５を穿孔するようにしている。 First, as shown in FIG. 1, at a rising portion 2 of a fabric foundation 1 of a house, a bolt embedding hole 4 having a predetermined depth is excavated from the top end surface 3 using a drill or the like. The bolt embedding hole 4 has a large-diameter portion 5 having a large hole diameter in the vicinity of the opening 4 a, and a lower-diameter portion 6 below the large-diameter portion 5. In forming the bolt embedding hole 4, the large diameter portion 5 is drilled and then the small diameter portion 6 is drilled downward from the bottom center, or the small diameter portion 6 is drilled. The large-diameter portion 5 is perforated so as to expand the vicinity of the opening 4a.
そして、ボルト埋込用孔４内をコンプレッサー等を用いて清掃した後、ボルト埋込用孔４の小径部６内に、例えばエポキシ樹脂等の有機系接着剤１０を充填する。なお、この充填に際しては、インジェクタを使用して有機系接着剤１０を注入する公知の注入方式、或いは、有機系接着剤１０を収容したカプセルを落とし込む公知のカプセル方式のいずれを採用しても良い。 Then, after the inside of the bolt embedding hole 4 is cleaned using a compressor or the like, the small diameter portion 6 of the bolt embedding hole 4 is filled with an organic adhesive 10 such as an epoxy resin. In this filling, either a known injection method of injecting the organic adhesive 10 using an injector or a known capsule method of dropping a capsule containing the organic adhesive 10 may be employed. .
次に、図２に示すように、ボルト埋込用孔４内にアンカーボルト１１を挿入する。このアンカーボルト１１としては、全長に亘って螺子部を有する寸切りボルトが使用されているが、一端側にのみ螺子部を有するものを使用しても良い。なお、上記のカプセル方式を採用した場合には、アンカーボルト１１の挿入によりカプセルを破砕して、カプセル内の有機系接着剤１０を流出させるようにする。 Next, as shown in FIG. 2, the anchor bolt 11 is inserted into the bolt embedding hole 4. As this anchor bolt 11, a dimensioned bolt having a screw portion over its entire length is used, but a bolt having a screw portion only on one end side may be used. In addition, when said capsule system is employ | adopted, the capsule is crushed by insertion of the anchor bolt 11, and the organic adhesive 10 in a capsule is made to flow out.
アンカーボルト１１をボルト埋込用孔４内に挿入した状態では、その螺子部がボルト埋込用孔４の開口４ａから上方へ突出しており、ボルト埋込用孔４の小径部６の孔壁とアンカーボルト１１との間には、有機系接着剤１０がきっちりと隙間なく介在している。 In a state where the anchor bolt 11 is inserted into the bolt embedding hole 4, the screw portion protrudes upward from the opening 4 a of the bolt embedding hole 4, and the hole wall of the small diameter portion 6 of the bolt embedding hole 4. Between the anchor bolts 11 and the anchor bolts 11, the organic adhesive 10 is interposed without any gaps.
そして、有機系接着剤１０が硬化すると、その接着力によってアンカーボルト１１が布基礎１の立ち上がり部２に物理的に固着される。このようにして固着したアンカーボルト１１の引抜耐力は、有機系接着剤１０へのアンカーボルト１１の埋め込み長さ寸法Ｌ１すなわち小径部６の深さによって決まることから、この小径部６の深さを適宜調整することで、アンカーボルト１１の引抜耐力を十分に確保している。 When the organic adhesive 10 is cured, the anchor bolt 11 is physically fixed to the rising portion 2 of the fabric base 1 by the adhesive force. The pulling strength of the anchor bolt 11 fixed in this way is determined by the embedding length dimension L1 of the anchor bolt 11 in the organic adhesive 10, that is, the depth of the small diameter portion 6. Therefore, the depth of the small diameter portion 6 is determined. By appropriately adjusting, the pulling strength of the anchor bolt 11 is sufficiently secured.
続いて、図３に示すように、ボルト埋込用孔４の大径部５内に、耐火性を有する例えばモルタル等のセメント系材料１２を流し込んで、小径部６に充填されている有機系接着剤１０を被覆する。これにより、有機系接着剤１０は、立ち上がり部２の天端面３に露出することなく、立ち上がり部２内部に完全に埋め込まれた状態となり、火災等が発生しても、その火や熱の影響を受け難くなって変形や焼失が生じないようになっている。特に、ボルト埋込用孔４の開口４ａから有機系接着剤１０までのセメント系材料１２の被覆部分の長さ寸法Ｌ２すなわち大径部５の深さを、布基礎１の立ち上がり部２に埋設した図示しない鉄筋のコンクリート被り厚さ寸法と同等かそれ以上としているので、耐火性能についての信頼性を高めている。なお、セメント系材料１２の被覆部分の長さ寸法L２は、必ずしも鉄筋のコンクリート被り厚さ寸法と同等かそれ以上とする必要はなく、有機系接着剤１０に対して熱の影響が及ばない範囲内であれば、鉄筋のコンクリート被り厚さ寸法よりも小さくしても良い。 Subsequently, as shown in FIG. 3, a fire-resistant cement-based material 12 such as mortar is poured into the large-diameter portion 5 of the bolt embedding hole 4 to fill the small-diameter portion 6. Adhesive 10 is coated. As a result, the organic adhesive 10 is not completely exposed to the top end surface 3 of the rising portion 2 and is completely embedded in the rising portion 2, and even if a fire or the like occurs, the influence of the fire or heat It becomes difficult to receive, and deformation and burning do not occur. In particular, the length L 2 of the covering portion of the cement-based material 12 from the opening 4 a of the bolt embedding hole 4 to the organic adhesive 10, that is, the depth of the large-diameter portion 5 is embedded in the rising portion 2 of the fabric foundation 1. Since it is equal to or more than the concrete covering thickness dimension of a reinforcing bar (not shown), the reliability of fire resistance is improved. The length L2 of the covering portion of the cement-based material 12 is not necessarily equal to or greater than the concrete covering thickness of the reinforcing bar, and the range in which the organic adhesive 10 is not affected by heat. If it is inside, you may make it smaller than the concrete covering thickness dimension of a reinforcing bar.
なお、このようにして耐火性に配慮しながら引抜耐力を十分に確保した状態で布基礎１の立ち上がり部２に固着したアンカーボルト１１の表面に露出した螺子部には、住宅の増築や改築に際に使用する耐震補強用や補修用その他の各種部材が取り付けられることになる。 In addition, the screw portion exposed to the surface of the anchor bolt 11 fixed to the rising portion 2 of the fabric foundation 1 in a state in which the pulling strength is sufficiently secured in consideration of fire resistance in this way is used for extension or reconstruction of a house. Various other members for seismic reinforcement and repair used at the time are attached.
この発明は、上記実施形態に限定されるものではなく、この発明の範囲内で上記実施形態に多くの修正及び変更を加え得ることは勿論である。 The present invention is not limited to the above embodiment, and it is needless to say that many modifications and changes can be made to the above embodiment within the scope of the present invention .
１・・コンクリート構造物（布基礎）、２・・立ち上がり部、４・・ボルト埋込用孔、４ａ・・開口、５・・大径部、１０・・有機系接着剤、１１・・アンカーボルト、１２・・セメント系材料、Ｌ２・・被覆部分の長さ寸法 1 .... Concrete structure (cloth foundation) 2 .... Rising part 4 .... Bolt embedding hole 4a ... Opening 5 ... Large diameter part 10 .... Organic adhesive 11 ... Anchor Bolt, 12 ·· Cement-based material, L2 ·· Length dimension of coated part
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| JP5950723B2 (en) * | 2012-06-28 | 2016-07-13 | 東日本旅客鉄道株式会社 | Anchor construction method and drilling jig |
| JP5950724B2 (en) * | 2012-06-28 | 2016-07-13 | 東日本旅客鉄道株式会社 | Anchor construction method |
| JP6049365B2 (en) * | 2012-09-11 | 2016-12-21 | 旭化成アドバンス株式会社 | Repair method for corroded anchor bolt fixing foundation |
| JP6308345B2 (en) * | 2013-05-21 | 2018-04-11 | 株式会社Ihi | Anchor anchoring structure |
| CN112210963B (en) * | 2019-07-10 | 2024-07-16 | 青岛海尔洗衣机有限公司 | Wall-mounted washing equipment and installation method thereof |
| CN111980168A (en) * | 2020-07-31 | 2020-11-24 | 国住人居工程顾问有限公司 | Module building node that bolt and structure are glued and are connected |
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| JPS58176343A (en) * | 1982-04-06 | 1983-10-15 | ナショナル住宅産業株式会社 | Attachment of anchor bolt |
| JPS62233351A (en) * | 1986-04-02 | 1987-10-13 | 産機興業株式会社 | Anchor construction method and heat resistant member therefor |
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