JP7424887B2 - Cold-resistant inorganic anchor material and method for fixing anchor members using the anchor material - Google Patents
Cold-resistant inorganic anchor material and method for fixing anchor members using the anchor material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims description 89
- 238000000034 method Methods 0.000 title claims description 16
- 239000011230 binding agent Substances 0.000 claims description 28
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 21
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 235000010288 sodium nitrite Nutrition 0.000 claims description 5
- IDNHOWMYUQKKTI-UHFFFAOYSA-M lithium nitrite Chemical compound [Li+].[O-]N=O IDNHOWMYUQKKTI-UHFFFAOYSA-M 0.000 claims description 4
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 239000004568 cement Substances 0.000 description 13
- 238000002156 mixing Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 10
- 239000007798 antifreeze agent Substances 0.000 description 8
- 238000004898 kneading Methods 0.000 description 7
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 6
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000007665 sagging Methods 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000004202 carbamide Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 210000003205 muscle Anatomy 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- -1 alkali metal nitrites Chemical class 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 230000002528 anti-freeze Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 1
- IIVSXHXFUFTNLB-UHFFFAOYSA-N [Li].N(=O)O Chemical compound [Li].N(=O)O IIVSXHXFUFTNLB-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910001963 alkali metal nitrate Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910001964 alkaline earth metal nitrate Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000009746 freeze damage Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- Bridges Or Land Bridges (AREA)
- Joining Of Building Structures In Genera (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、耐寒用無機系アンカー材料及び該アンカー材料を用いたアンカー部材の固定方法に関し、特に低温下、例えば氷点下の環境においても有効に使用できる耐寒用注入式無機系あと施工アンカー材料及び当該アンカー材料を用いたアンカー部材の固定方法に関する。 The present invention relates to a cold-resistant inorganic anchor material and a method of fixing an anchor member using the anchor material, and particularly to a cold-resistant injection-type inorganic post-installation anchor material that can be effectively used even in low-temperature environments, such as sub-zero environments. The present invention relates to a method for fixing an anchor member using an anchor material.
建築物や舗装道路等の構造物の表面から所定の深さで形成される孔に、アンカー筋を収容し、アンカー筋と孔との間に充填材を充填することで、アンカー筋を構造物に固定する方法が知られている。
かかる建築・土木構造物であるコンクリート構造物に設けられた孔に注入するアンカー材料としては、無機系と有機系とに大別することができ、また施工形態として、カプセルタイプと注入タイプとがある。
Anchor bars are placed in holes formed at a predetermined depth from the surface of structures such as buildings and paved roads, and a filler is filled between the anchor bars and the holes, allowing the anchor bars to be attached to the structure. There are known methods of fixing the
Anchor materials injected into holes provided in concrete structures, which are such architectural and civil engineering structures, can be broadly classified into inorganic and organic types, and there are two types of construction methods: capsule type and injection type. be.
無機系アンカー材料は、セメントを主成分とし、水と混練されて、孔とアンカー筋との間に充填された後、硬化することで硬化層を形成する。そして、該硬化層が構造物およびアンカー筋と結合し、アンカー筋に対して孔から引き抜く方向に力が加わった際に、高い付着性能を有することで、アンカー筋が引き抜かれないように維持することが所望される。 The inorganic anchor material has cement as its main component, is mixed with water, is filled between the holes and the anchor bars, and is then hardened to form a hardened layer. The hardened layer is bonded to the structure and the anchor bar, and maintains the anchor bar from being pulled out by having high adhesion performance when force is applied to the anchor bar in the direction of pulling it out of the hole. It is desired that
例えば、建築構造物では、手すり、看板等の取り付け、ブレス工法等の耐震補強工事、土木構造物では、橋梁の落橋防止、トンネル内設備の取り付け、固定等に採用されているのが一般的である。 For example, in architectural structures, it is commonly used for installing handrails, signboards, etc., and in seismic reinforcement work such as brace construction, and in civil engineering structures, it is commonly used to prevent bridges from collapsing, and to install and secure equipment in tunnels. be.
通常、コンクリートやモルタル等のセメント系材料は、寒冷地における氷点下で使用する場合には、練り混ぜに使用する水が凍結するため、初期凍害を受けてしまい、耐久性、水密性等が著しく劣ることが知られている。
そこで、冬季の施工においては、特に氷点下の環境では、亜硝酸塩、硝酸塩、尿素、エチレングリコール等の防凍剤を添加して混練水の凝固点を降下させ、凍結を防止して施工を実施している。
また、無機系アンカー材料も、氷点下の場合には、初期凍害を受けてアンカー筋との付着性能に大きな影響を及ぼすことも懸念されている。
Normally, when cement-based materials such as concrete and mortar are used at sub-zero temperatures in cold regions, the water used for mixing freezes, resulting in initial freeze damage and significantly inferior durability and watertightness. It is known.
Therefore, during winter construction, especially in sub-zero environments, antifreeze agents such as nitrites, nitrates, urea, and ethylene glycol are added to lower the freezing point of the mixing water to prevent freezing. .
In addition, there is also concern that inorganic anchor materials may be subject to initial frost damage in sub-zero temperatures, which may have a significant impact on their adhesion performance with anchor threads.
低温でのセメント材料用付着保持材として、特許第５７４０９０９号（特許文献１）には、コンクリート構造体をセメント系材料で補修するための下地処理材として温度５℃以下の環境下で使用するセメント材料用付着保持材であって、亜硝酸ナトリウム、亜硝酸リチウム、硝酸カルシウム、亜硝酸カルシウムからなる群より選ばれる物質が固形分濃度５～５０質量％で溶解している水溶液であることを特徴とする、セメント材料用付着保持材が記載されている。 As an adhesive retention material for cement materials at low temperatures, Patent No. 5740909 (Patent Document 1) describes cement that can be used in environments with a temperature of 5 degrees Celsius or lower as a ground preparation material for repairing concrete structures with cement materials. An adhesion-retaining material for materials, characterized by being an aqueous solution in which a substance selected from the group consisting of sodium nitrite, lithium nitrite, calcium nitrate, and calcium nitrite is dissolved at a solid content concentration of 5 to 50% by mass. An adhesion-retaining material for cement materials is described.
また、特開昭６２－２３５２３９号公報（特許文献２）には、セメント質物質とアルカリ金属硝酸塩、アルカリ土類金属硝酸塩、アルカリ金属亜硝酸塩及びアルカリ土類金属亜硝酸塩の群から選ばれた１種以上とを主成分とする素子の定着組成物であって、セメント質物質は、ポルトランド系セメント、アルミナセメント、スラグ系セメント及びこれらのセメントにＣａ０－Ａｌ２０３系の化合物を混合したものが開示されている。
さらに特開２０１８－０８００９２号公報（特許文献３）には、水との接触により最高で１０℃の作業温度及び／又は周辺温度で硬化する寒冷地用の水硬性組成物であって、ポルトランドセメント、アルミナセメント、及び急結剤を含有する水硬成分と、カオリンを主成分とする強度増進剤と、流動化剤と、凝結調整剤とを含み、前記ポルトランドセメントを２０～４０質量部、前記アルミナセメントを３０～５０質量部、前記急結剤を１０～３０質量部、前記カオリンを１～１０質量部、前記凝結調整剤を０．１～１質量部、前記流動化剤を０．１～１質量部とする水硬性組成物が開示されている。
Furthermore, JP-A No. 62-235239 (Patent Document 2) discloses that a cementitious material and a compound selected from the group of alkali metal nitrates, alkaline earth metal nitrates, alkali metal nitrites, and alkaline earth metal nitrites are disclosed. A fixing composition for an element mainly composed of a cementitious substance including Portland cement, alumina cement, slag cement, and a mixture of these cements with a Ca0-Al 2 O 3 -based compound. something is disclosed.
Further, JP 2018-080092 A (Patent Document 3) discloses a hydraulic composition for use in cold regions that hardens at a working temperature of up to 10°C and/or ambient temperature upon contact with water, , alumina cement, and a hydraulic component containing an accelerating agent, a strength enhancer containing kaolin as a main component, a fluidizing agent, and a setting modifier; 30 to 50 parts by mass of alumina cement, 10 to 30 parts by mass of the quick setting agent, 1 to 10 parts by mass of kaolin, 0.1 to 1 part by mass of the setting modifier, and 0.1 part by mass of the fluidizing agent. 1 part by weight of hydraulic compositions are disclosed.
しかし、従来の無機系アンカー材料では、上記防凍剤を使用した場合に、圧縮強度の改善は得られるが、防凍剤の添加により流動性が悪くなり、また収縮率が増加して、アンカー材料に所望される施工性能（上向き施工時のダレ性）や力学特性（圧縮強度や引張強度）が低下してしまう。 However, with conventional inorganic anchor materials, when the above-mentioned antifreeze agent is used, the compressive strength can be improved, but the addition of the antifreeze agent deteriorates fluidity and increases the shrinkage rate, making the anchor material Desired construction performance (sag resistance during upward construction) and mechanical properties (compressive strength and tensile strength) are reduced.
そこで、氷点下の環境でも、可使時間を確保でき、ダレ性が少ない良好な施工性能を有するとともに、アンカー部材との付着性能に優れ、十分な圧縮強度を有する耐寒用無機系アンカー材料が所望されている。 Therefore, there is a need for a cold-resistant inorganic anchor material that can secure pot life even in sub-zero environments, has good construction performance with little sagging, has excellent adhesion to anchor members, and has sufficient compressive strength. ing.
本発明の目的は、上記課題を解決し、氷点下の環境でも適切な可使時間を確保でき、ダレ性が少ない良好な施工性能を有するとともに、アンカー筋等のアンカー部材との付着性能に優れ、当該アンカー材料とコンクリート構造物との付着強度を良好に維持することができる耐寒用無機系アンカー材料、特にあと施工アンカー材料を提供することである。
また、本発明の他の目的は、本発明の耐寒用無機系アンカー材料を用いて、寒冷環境下においてもアンカー部材を簡易に且つ有効に定着することができる、アンカー部材の固定方法を提供することである。
The purpose of the present invention is to solve the above-mentioned problems, to ensure an appropriate pot life even in sub-zero environments, to have good construction performance with little sag, and to have excellent adhesion performance with anchor members such as anchor bars. An object of the present invention is to provide a cold-resistant inorganic anchor material, particularly a post-installed anchor material, which can maintain good adhesion strength between the anchor material and a concrete structure.
Another object of the present invention is to provide a method for fixing an anchor member that can be easily and effectively fixed even in a cold environment by using the cold-resistant inorganic anchor material of the present invention. That's true.
本発明は、氷点下の条件においても、特定のセメントと特定の防凍剤とを含み、防凍剤の含有量を特定することで、上記課題を解決することを見出し、本発明に到った。 The present invention has been made based on the discovery that the above-mentioned problem can be solved by including a specific cement and a specific antifreeze agent and specifying the content of the antifreeze agent even under sub-zero conditions, leading to the present invention.
請求項１記載の耐寒用無機系アンカー材料は、超速硬性バインダー及び亜硝酸塩を含み、超速硬性バインダーは、超速硬性鉱物としてのＣＡ（ＣａＯ・Ａｌ２Ｏ３）を１０～５０質量％及びＣ２ＡＳ（２ＣａＯ・Ａｌ２Ｏ３・ＳｉＯ２）を３～４０質量％含み、Ｃ１２Ａ７（１２ＣａＯ・７Ａｌ２Ｏ３）は実質的に含有せず、亜硝酸塩は、超速硬性バインダー１００質量部に対して３～１３質量部で含有されることを特徴とする、耐寒用無機系アンカー材料である。
The cold-resistant inorganic anchor material according to
請求項２記載の耐寒用無機系アンカー材料は、上記耐寒用無機系アンカー材料において、亜硝酸塩は、亜硝酸リチウム、亜硝酸カルシウム及び亜硝酸ナトリウムから成る群より選ばれる少なくとも１種であることを特徴とする、耐寒用無機系アンカー材料である。
The cold-resistant inorganic anchor material according to
請求項３記載の耐寒用無機系アンカー材料は、上記いずれかの耐寒用無機系アンカー材料において、－１０℃における圧縮強度がＪＩＳ Ａ １１０８の「コンクリート圧縮強さ試験」に準拠して測定して２９．４Ｎ／ｍｍ２以上で、―１０℃におけるアンカー部材の付着強度がＪＣＡＡの「あと施工アンカー試験方法」に準拠して測定して１０．９Ｎ／ｍｍ２以上であることを特徴とする、耐寒用無機系アンカー材料である。 The cold-resistant inorganic anchor material according to claim 3 has a compressive strength at -10°C measured in accordance with JIS A 1108 "Concrete compressive strength test" in any of the above cold-resistant inorganic anchor materials. 29.4 N/mm 2 or more, and the adhesion strength of the anchor member at -10°C is 10.9 N/mm 2 or more as measured in accordance with JCAA's "post-installed anchor test method", It is an inorganic anchor material for cold resistance.
請求項４記載のアンカー部材の固定方法は、上記いずれかの耐寒用無機系アンカー材料を、カートリッジに内包し、該カートリッジを注入ガンに取り付けて、当該耐寒用無機系アンカー材料をコンクリート構造物の孔に充填して硬化させてアンカー部材を固定することを特徴とする、アンカー部材の固定方法である。 A method for fixing an anchor member according to claim 4 includes encapsulating any of the cold-resistant inorganic anchor materials described above in a cartridge, attaching the cartridge to an injection gun, and fixing the cold-resistant inorganic anchor material to a concrete structure. This is a method of fixing an anchor member, characterized by fixing the anchor member by filling the hole and hardening the anchor member.
本発明の耐寒用無機系アンカー材料は、超速硬性バインダーと亜硝酸塩とを組み合わせることにより、氷点下の環境においても適切な可使時間を有し、ダレ性等の施工性に優れるため、上向き施工においても有効に使用でき、高い圧縮強度を有し、アンカー部材との優れた付着強度を保持することが可能となる。
また本発明のアンカー部材の固定方法は、寒冷環境下においても、コンクリート構造物の孔に充填した該無機系アンカー材料が垂れることなく、効率よく簡単に施工することができる。
また特に、アンカー用カートリッジ等の注入容器を用いることで、耐寒用無機系アンカー材料の撹拌混合作業と充填作業を同一の容器で行うこともでき、撹拌混合作業中の粉塵の発生をほぼゼロに抑えられ、孔内充填、特に上向き充填を簡便に行うことが可能となる。
The cold-resistant inorganic anchor material of the present invention has an appropriate pot life even in sub-zero environments by combining an ultra-fast hardening binder and nitrite, and has excellent workability such as sag resistance, so it can be used in upward construction. It can also be used effectively, has high compressive strength, and can maintain excellent adhesion strength with the anchor member.
Further, the method for fixing an anchor member of the present invention can be carried out efficiently and easily even in a cold environment without causing the inorganic anchor material filled in the holes of a concrete structure to sag.
In particular, by using injection containers such as anchor cartridges, stirring and mixing of cold-resistant inorganic anchor materials and filling can be performed in the same container, reducing the generation of dust during stirring and mixing to almost zero. This makes it possible to easily perform filling in the hole, especially upward filling.
本発明を次の形態により説明するが、これらに限定されるものではない。
本発明の耐寒用無機系アンカー材料は、超速硬性バインダー及び亜硝酸塩を含み、前記超速硬性バインダーは、超速硬性鉱物としてのＣＡを１０～５０質量％、Ｃ２ＡＳを３～４０質量％含み、Ｃ１２Ａ７は実質的に含有せず、亜硝酸塩は、超速硬性バインダー１００質量部に対して３～１３質量部で含有される、耐寒用無機系アンカー材料である。
The present invention will be explained using the following embodiments, but is not limited thereto.
The cold-resistant inorganic anchor material of the present invention contains a super-fast-hardening binder and a nitrite, and the super-fast-hardening binder contains 10 to 50 mass% of CA as a super-fast-hardening mineral, 3 to 40 mass% of C2AS, and C12A7 is This cold-resistant inorganic anchor material contains substantially no nitrite, and is contained in an amount of 3 to 13 parts by mass based on 100 parts by mass of the ultra-fast hardening binder.
通常、超速硬性鉱物としては、ＣＡ、Ｃ２ＡＳ及びＣ１２Ａ７が該当するが、本発明においては、超速硬性バインダー中にはＣＡ及びＣ２ＡＳが含まれ、Ｃ１２Ａ７は実質的に含まれない。超速硬性バインダー中に含まれるＣＡ及びＣ２ＡＳの含有量は、ＣＡが１０～５０質量％、Ｃ２ＡＳが３～４０質量％である。
かかる範囲でＣＡ及びＣ２ＡＳを含有し、更にＣ１２Ａ７を実質的に含有しないことにより、本発明の上記効果を有効に発現することができる。
ここでＣ１２Ａ７を実質的に含有しないとは、仮に含まれたとしても１質量％未満であることを意味し、好ましくは０％である。
Ｃ１２Ａ７を１質量％以上で含むと、適切な可使時間を確保できず、施工性は十分ではなくなる場合があり望ましくない。
Normally, CA, C2AS, and C12A7 are applicable as super-fast-hardening minerals, but in the present invention, the super-fast-hardening binder contains CA and C2AS, and substantially does not contain C12A7. The content of CA and C2AS contained in the ultra-fast hardening binder is 10 to 50% by mass of CA and 3 to 40% by mass of C2AS.
By containing CA and C2AS in such ranges and not substantially containing C12A7, the above-mentioned effects of the present invention can be effectively exhibited.
Here, "not substantially containing C12A7" means that even if it is contained, it is less than 1% by mass, and preferably 0%.
If C12A7 is contained in an amount of 1% by mass or more, an appropriate pot life cannot be ensured, and workability may not be sufficient, which is not desirable.
また、超速硬性バインダー中には、ＣＡが１０～５０質量％含まれるとともにＣ２ＡＳが３～４０質量％含まれる。かかる含有範囲を逸脱すると、氷点下の環境でのコンクリート構造物との付着性が劣り、適切な可使時間が得られず施工性が劣ることとなる。 Further, the ultra-fast hardening binder contains 10 to 50% by mass of CA and 3 to 40% by mass of C2AS. If the content exceeds this range, adhesion to concrete structures in a sub-zero environment will be poor, an appropriate pot life will not be obtained, and workability will be poor.
かかる超速硬性バインダーとして、ＣＡが１０～５０質量％、Ｃ２ＡＳが３～４０質量％含まれ、Ｃ１２Ａ７は実質的に含有されない超速硬性バインダーが得られるのであれば、超速硬セメントを超速硬性バインダーとして含むこともできる。 As such a super fast hardening binder, if a super fast hardening binder containing 10 to 50% by mass of CA, 3 to 40% by mass of C2AS, and substantially no C12A7 can be obtained, a super fast hardening cement may be included as the super fast hardening binder. You can also do that.
一例としての従来のポルトランドセメントを用いるアンカー材料は、凝結時間が長く、特に横向きや上向きの孔に充填する場合には、時間の経過とともに、アンカー材料が孔から垂れてきたり、次工程までの移行時間が長くなっていたが、本発明においては、氷点下の環境においても適切な可使時間を確保するとともにダレ性に優れるため、このような問題は生じない。 Anchor materials using conventional Portland cement, for example, have a long setting time, and over time, especially when filling sideways or upwardly facing holes, the anchor material may drip from the hole or migrate to the next process. However, in the present invention, such a problem does not occur because an appropriate pot life is ensured even in a sub-zero environment and the product has excellent sag resistance.
また本発明の耐寒用無機系アンカー材料には、前記超速硬性バインダーと組み合わせて、亜硝酸塩を必須成分として含有する。
本発明の耐寒用無機系アンカー材料に用いる亜硝酸塩としては、特に限定されず、任意の亜硝酸塩を含むことができるが、好ましくは、亜硝酸リチウム、亜硝酸カルシウム及び亜硝酸ナトリウムから成る群より選ばれる少なくとも１種の亜硝酸塩を用いることが、本発明の上記効果を更に有効に発現するために望ましい。
また、亜硝酸塩の粒度は特に限定されず、またその配合量は、上記超速硬性バインダー１００質量部に対して３～１３質量部であり、好ましくは３．５～１２．５質量部である。
かかる範囲で超速硬性バインダーと亜硝酸塩とを組み合わせて用いることにより、氷点下における環境においても、施工性に優れ、圧縮強度や付着（引張）強度を良好に保持することが可能となる。
なお、かかる亜硝酸塩は、混練水に予め配合して溶解させておくことが望ましい。
Furthermore, the cold-resistant inorganic anchor material of the present invention contains nitrite as an essential component in combination with the ultra-fast hardening binder.
The nitrite used in the cold-resistant inorganic anchor material of the present invention is not particularly limited and can include any nitrite, but is preferably selected from the group consisting of lithium nitrite, calcium nitrite, and sodium nitrite. It is desirable to use at least one selected nitrite in order to more effectively exhibit the above-mentioned effects of the present invention.
Further, the particle size of the nitrite is not particularly limited, and the amount thereof is 3 to 13 parts by mass, preferably 3.5 to 12.5 parts by mass, based on 100 parts by mass of the ultra-fast hardening binder.
By using a combination of an ultra-rapid hardening binder and a nitrite in such a range, it becomes possible to have excellent workability and maintain good compressive strength and adhesive (tensile) strength even in a sub-zero environment.
Note that it is desirable that the nitrite be blended and dissolved in the kneading water in advance.
従来は、防凍剤として、尿素、エチレングリコール、硝酸カルシウム等を用いていたが、本発明においては、これらの防凍剤は含まれない。 Conventionally, urea, ethylene glycol, calcium nitrate, etc. have been used as antifreeze agents, but these antifreeze agents are not included in the present invention.
本発明の耐寒用無機系アンカー材料には、骨材が含有されるが、骨材としては特に限定されず、コンクリートやモルタルに用いられる一般的な細骨材を好適に用いることができる。
細骨材としては、川砂、海砂、山砂、砕砂等の天然細骨材、再生細骨材、人工細骨材を例示することができる。
細骨材の配合割合は、特に限定されず、現場での所望する要求に応じて、任意に配合することができるが、好適には、超速硬性バインダー１００質量部に対して、好ましくは３０～２００質量部、より好ましくは４０～１００質量部であり、細骨材の最大寸法は１．２ｍｍであることが望ましい。
Although the cold-resistant inorganic anchor material of the present invention contains aggregate, the aggregate is not particularly limited, and general fine aggregates used in concrete and mortar can be suitably used.
Examples of the fine aggregate include natural fine aggregates such as river sand, sea sand, mountain sand, and crushed sand, recycled fine aggregates, and artificial fine aggregates.
The blending ratio of the fine aggregate is not particularly limited and can be blended arbitrarily depending on the desired requirements at the site, but it is preferably 30 to 30 parts by mass based on 100 parts by mass of the ultra-rapid hardening binder. It is desirable that the amount is 200 parts by mass, more preferably 40 to 100 parts by mass, and the maximum dimension of the fine aggregate is 1.2 mm.
更に、水を配合して本発明の耐寒用無機系アンカー材料を得るが、水は、水／超速硬性バインダー質量比で好ましくは３０～５０、より好ましくは３５～４５である。３０未満であるとバインダー粉体と水とが不均一となりノズルからの排出が困難となり、５０を超えると充填した材料が孔から流出したり、ダレ性や付着強度が低下するため好ましくない。 Furthermore, water is blended to obtain the cold-resistant inorganic anchor material of the present invention, and the water/ultra-rapid hardening binder mass ratio of water is preferably 30 to 50, more preferably 35 to 45. If it is less than 30, the binder powder and water will be non-uniform, making it difficult to discharge from the nozzle, and if it exceeds 50, the filled material may flow out of the holes, and the sag resistance and adhesive strength will decrease, which is not preferable.
本発明の耐寒用無機系アンカー材料には、必要に応じて、公知の混和剤や添加剤、例えば減水剤、遅延剤、ポリマー、防錆剤、凝結遅延剤等を、本発明の効果を害さない範囲で添加することができる。 The cold-resistant inorganic anchor material of the present invention may contain known admixtures and additives, such as water reducing agents, retarders, polymers, rust preventives, setting retarders, etc., as necessary, so as not to impair the effects of the present invention. It can be added within a certain range.
本発明の耐寒用無機系アンカー材料は、予め、超速硬性バインダーと亜硝酸塩等の粉末体を配合し、それに細骨材や水を配合して均一に混練することで製造することもできるが、好ましくは予め亜硝酸塩を混練水に溶解し、超速硬性バインダーと、亜硝酸塩水溶液と、骨材等の各材料を現場で配合して、任意のミキサーを用いて混練することで製造することも可能であり、均一な材料が調製できればその方法は限定されない。 The cold-resistant inorganic anchor material of the present invention can also be produced by blending an ultra-fast hardening binder and a powder such as nitrite in advance, blending fine aggregate and water with it, and kneading it uniformly. It is also possible to manufacture the product by preferably dissolving nitrite in kneading water in advance, mixing the ultra-fast hardening binder, nitrite aqueous solution, aggregate, and other materials on site and kneading using any mixer. The method is not limited as long as a uniform material can be prepared.
本発明の耐寒用無機系アンカー材料は、特に氷点下の環境で、例えば、既設のコンクリート構造物にアンカー部材を固定するのに用いられる。
具体的には、コンクリート構造物に表面より穿孔し、該孔に本発明の耐寒用無機系アンカー材料を充填し、アンカー筋を挿入して、該耐寒用無機系アンカー材料を硬化させて、アンカー部材を固定させる。
孔への耐寒用無機系アンカー材料の充填方法は、特に限定されず、公知の方法を適用することができるが、施工の容易性より、例えば、カートリッジに当該アンカー材料を充填し、該カートリッジを注入ガンと称される吐出機に取り付けて、ノズルから当該アンカー材料を孔の奥に注入して硬化させる方法を好適に用いることができる。
また、アンカー材料として本発明の耐寒用無機系アンカー材料を用いているため、氷点下の環境でも、適切な可使時間を保持し、注入した当該アンカー材料が垂れてくることがなく、迅速にアンカー部材を固定することができる。
The cold-resistant inorganic anchor material of the present invention is used, for example, to fix an anchor member to an existing concrete structure, particularly in a sub-zero environment.
Specifically, a hole is drilled from the surface of a concrete structure, the hole is filled with the cold-resistant inorganic anchor material of the present invention, an anchor reinforcement is inserted, and the cold-resistant inorganic anchor material is hardened. Fix the parts.
The method of filling the hole with the cold-resistant inorganic anchor material is not particularly limited, and any known method can be applied. However, from the viewpoint of ease of construction, for example, filling a cartridge with the anchor material and then inserting the cartridge into the hole is not particularly limited. A method of attaching the anchor material to a discharger called an injection gun and injecting the anchor material deep into the hole from a nozzle to harden it can be suitably used.
In addition, since the cold-resistant inorganic anchor material of the present invention is used as the anchor material, it maintains an appropriate pot life even in sub-zero environments, and the injected anchor material does not drip and can be quickly anchored. The member can be fixed.
カートリッジや注入ガンは、任意の公知のものを用いることができ、例えば、シーリングガンまたはコーキングガンは、カートリッジを装着するカートリッジ用ガンとして使用することができる。 Any known cartridge or injection gun can be used; for example, a sealing gun or caulking gun can be used as a cartridge gun for mounting the cartridge.
本発明の耐寒用無機系アンカー材料は、下記試験例に記載したように、氷点下、例えば－１０℃の温度下において、ＪＡＳＳ１５ Ｍ１０３（セルフレベリング材の品質基準試験）に準じて測定したダレ性のフロー試験値が７０ｍｍ以下であり、可使時間も下記試験例の方法で測定して３１～８０分と適切であり、またＪＩＳ Ａ １１０８「コンクリート圧縮強さ試験」に準じて測定した圧縮強度が２９．４Ｎ／ｍｍ２以上であり、また、ＪＣＡＡの「あと施工アンカー試験方法」に準拠して測定したアンカー筋の引張強度が１０．９Ｎ／ｍｍ２以上とすることが可能となる。
本発明のアンカー部材の固定方法は、氷点下の環境においても、適切な可使時間を有し、材料ダレすることなく施工性に優れ、初期凍害を受けることなく強度を発現し、アンカー部材の付着性能を著しく向上させることができる。
As described in the test example below, the cold-resistant inorganic anchor material of the present invention has a sagging property measured in accordance with JASS15 M103 (quality standard test for self-leveling materials) at a temperature below freezing, for example, -10°C. The flow test value is 70 mm or less, the pot life is appropriate at 31 to 80 minutes when measured using the test example below, and the compressive strength measured according to JIS A 1108 "Concrete compressive strength test" is It is 29.4 N/mm 2 or more, and it is possible to make the tensile strength of the anchor bar 10.9 N/mm 2 or more as measured in accordance with JCAA's "post-installed anchor test method".
The anchor member fixing method of the present invention has an appropriate pot life even in a sub-zero environment, has excellent workability without material sagging, develops strength without suffering from initial frost damage, and provides anchor member adhesion. Performance can be significantly improved.
本発明を次の実施例、比較例及び試験例に基づき説明する。
（１）原材料
無機系アンカー材料を調製するにあたり、以下の各原材料を用いた。
・超速硬性バインダー：表１及び表２に示す超速硬性鉱物組成を有するもの
・普通ポルトランドセメント：住友大阪セメント（株）製
・早強ポルトランドセメント：住友大阪セメント（株）製
・防凍剤：亜硝酸リチウム（日産化学工業（株）製）
亜硝酸カリウム（関東化学（株）製）
亜硝酸ナトリウム（関東化学（株）製）
尿素：（関東化学（株）製）
硝酸カルシウム：（関東化学（株）製）
・細骨材（Ｂ）：６号砂
・混練水（Ｗ）：水道水
・増粘剤：メチルセルロース系増粘剤（２％水溶液、粘度：４０００ｍＰａ・ｓ） ハイメトローズ９０：（信越化学工業（株）製）
The present invention will be explained based on the following Examples, Comparative Examples, and Test Examples.
(1) Raw materials In preparing the inorganic anchor material, the following raw materials were used.
・Super fast-hardening binder: having the ultra-fast hardening mineral composition shown in Tables 1 and 2 ・Ordinary Portland cement: manufactured by Sumitomo Osaka Cement Co., Ltd. ・Early strength Portland cement: manufactured by Sumitomo Osaka Cement Co., Ltd. ・Freezing agent: nitrous acid Lithium (manufactured by Nissan Chemical Industries, Ltd.)
Potassium nitrite (manufactured by Kanto Chemical Co., Ltd.)
Sodium nitrite (manufactured by Kanto Chemical Co., Ltd.)
Urea: (manufactured by Kanto Kagaku Co., Ltd.)
Calcium nitrate: (manufactured by Kanto Chemical Co., Ltd.)
・Fine aggregate (B): No. 6 sand ・Kneading water (W): Tap water ・Thickener: Methyl cellulose thickener (2% aqueous solution, viscosity: 4000 mPa・s) Hymetrose 90: (Shin-Etsu Chemical Co., Ltd. ) made)
（２）実施例１～１５及び比較例１～１６
上記各原材料を用いて、表１及び表２に示す配合比で各原材料を配合して、各無機系アンカー材料を調製した。
具体的には、混練水に予め上記各防凍剤を溶解して各水溶液を調製した。
表１及び２に示す超速硬性バインダーと、骨材と、増粘剤と、調製した上記各水溶液とを、表１及び表２に示す配合割合で混錬して、各無機系アンカー材料を調製した。
(2) Examples 1 to 15 and Comparative Examples 1 to 16
Using each of the above raw materials, each raw material was blended at the blending ratio shown in Tables 1 and 2 to prepare each inorganic anchor material.
Specifically, each of the above-mentioned antifreeze agents was dissolved in advance in kneading water to prepare each aqueous solution.
Each inorganic anchor material was prepared by kneading the ultra-fast hardening binder shown in Tables 1 and 2, aggregate, thickener, and each of the prepared aqueous solutions at the mixing ratio shown in Tables 1 and 2. did.
（３）試験例
以下の試験は、－１０℃、－５℃、０℃の寒冷温度下で実施した。
（試験例１）施工性／ダレ性
上記各実施例及び比較例で得られた練り混ぜ直後の各無機系アンカー材料を用いて、ＪＡＳＳ１５ Ｍ１０３「セルフレベリング材の品質基準試験」に準じ、図１に示すようにしてφ５０ｍｍ×ｈ５１ｍｍフロー試験により評価した。
その結果を、表１及び表２に示す。
なお、以下の評価基準で評価した。
〇：７０ｍｍ以下
△：７１～７５ｍｍ
×：７６ｍｍ以上
(3) Test Examples The following tests were conducted at cold temperatures of -10°C, -5°C, and 0°C.
(Test Example 1) Workability/Sagging property Using each inorganic anchor material immediately after mixing obtained in each of the above Examples and Comparative Examples, the tests were conducted according to JASS15 M103 "Quality Standard Test for Self-Leveling Materials" as shown in Figure 1. It was evaluated by a flow test of 50 mm in diameter and 51 mm in height as shown in FIG.
The results are shown in Tables 1 and 2.
In addition, the following evaluation criteria were used for evaluation.
〇: 70mm or less △: 71-75mm
×: 76mm or more
（試験例２）施工性／可使時間
上記各実施例及び比較例で得られた練り混ぜ直後の各無機系アンカー材料を用いて、市販のシーリングガン用のカートリッジ樹脂製注入器（３３０ｍｌタイプ：エーディーワイ（株）製）に充填し、前記カートリッジに注入用ノズル（φ１２ｍｍ）を取付けて、当該注入器からの排出可能時間を評価した。
その結果を、表１及び表２に示す。
なお、以下の評価基準で評価した。・
〇：３０～８０分（適切）
△：２０分～３０分未満
×：２０分未満または８０分を超える
(Test Example 2) Workability/Pot life Using each inorganic anchor material immediately after mixing obtained in each of the above Examples and Comparative Examples, a commercially available cartridge resin syringe for sealing gun (330ml type: An injection nozzle (φ12 mm) was attached to the cartridge, and the ejection time from the syringe was evaluated.
The results are shown in Tables 1 and 2.
In addition, the following evaluation criteria were used for evaluation.・
〇: 30-80 minutes (appropriate)
△: 20 minutes to less than 30 minutes ×: Less than 20 minutes or more than 80 minutes
（試験例３）機械的強度／圧縮強度
ＪＩＳ Ａ １１０８「コンクリート圧縮強さ試験」に準拠して圧縮強度試験を実施した。
具体的には、φ５０×１００ｍｍに各無機系アンカー材料を成形し、上記の各温度で養生し、材齢２８日における圧縮強度を測定した、
その結果を、表１及び表２に示す。
なお、以下の評価基準で評価した。
〇：２９．４Ｎ／ｍｍ２以上
×：２９．４Ｎ／ｍｍ２未満
(Test Example 3) Mechanical Strength/Compressive Strength A compressive strength test was conducted in accordance with JIS A 1108 "Concrete Compressive Strength Test".
Specifically, each inorganic anchor material was molded into a size of φ50 x 100 mm, cured at each of the above temperatures, and the compressive strength at the age of 28 days was measured.
The results are shown in Tables 1 and 2.
In addition, the following evaluation criteria were used for evaluation.
〇: 29.4N/mm 2 or more ×: 29.4N/mm less than 2
（試験例４）機械的強度／引張強度（アンカー筋との付着性）
鋼管に打設したコンクリートに、φ１６ｍｍの孔を形成し、各無機系アンカー材料を注入して、全ねじボルトＭ１２（材質ＳＮＢ７）を定着させて、ＪＣＡＡの「あと施工アンカー試験」に準じて、引張（付着）強度試験を実施した。
付着試験におけるアンカー筋等の条件は以下のとおりである。
・アンカー筋：Ｍ１２
・種類：ＳＮＢ７
・埋め込み長さ：８４ｍｍ（７ｄａ）
・アンカー筋直径：１２ｍｍ
・穿孔径：φ１６ｍｍ
・母材コンクリート：鋼管打ち込みコンクリート（σＢ＝２５Ｎ／ｍｍ２）
(Test Example 4) Mechanical strength/tensile strength (adhesion with anchor muscle)
A hole of φ16 mm was formed in the concrete poured into the steel pipe, each inorganic anchor material was injected, and a fully threaded bolt M12 (material SNB7) was fixed in accordance with JCAA's "post-installation anchor test". A tensile (adhesion) strength test was conducted.
The conditions for anchor bars, etc. in the adhesion test are as follows.
・Anchor muscle: M12
・Type: SNB7
・Embedded length: 84mm (7da)
・Anchor thread diameter: 12mm
・Drilling diameter: φ16mm
・Base material concrete: Steel pipe concrete (σB=25N/mm 2 )
具体的には、図２に示すような試験装置を用い、上記各実施例及び比較例で得られた無機系アンカー材料を、φ１６ｍｍの孔に注入して前記全ねじボルトＭ１２で定着させたものを上記の各温度の恒温槽に２８日間入れて、その後引張強度試験を実施した。
アンカー筋である全ねじボルトＭ１２を孔から引き抜く際の最大荷重Ａを測定した。
次いで、最大荷重Ａと付着面積Ｂとから引張（付着）強度Ｃを算出した。
なお、付着面積Ｂ及び引張（付着）強度Ｃは、下記式（１）及び（２）により算出した。
付着面積Ｂ＝アンカー筋の直径Ｄ×π×定着長（埋め込み深さ）Ｌ・・・（１）
引張強度Ｃ＝最大荷重Ａ／付着面積Ｂ・・・（２）
その結果を、表１及び表２に示す。
また、以下の評価基準で評価した。
〇：１０．９Ｎ／ｍｍ２以上
×：１０．９Ｎ／ｍｍ２未満
Specifically, using a test apparatus as shown in FIG. 2, the inorganic anchor materials obtained in each of the above examples and comparative examples were injected into a φ16 mm hole and fixed with the fully threaded bolt M12. were placed in a constant temperature bath at each of the above temperatures for 28 days, and then a tensile strength test was conducted.
The maximum load A when pulling out the fully threaded bolt M12, which is the anchor reinforcement, from the hole was measured.
Next, the tensile (adhesion) strength C was calculated from the maximum load A and the adhesion area B.
Note that the adhesion area B and the tensile (adhesion) strength C were calculated using the following formulas (1) and (2).
Attachment area B = Anchor muscle diameter D x π x Anchor length (embedding depth) L... (1)
Tensile strength C=maximum load A/adhesion area B...(2)
The results are shown in Tables 1 and 2.
In addition, the following evaluation criteria were used for evaluation.
〇: 10.9N/mm 2 or more ×: 10.9N/mm less than 2
（総合評価）
上記試験例１～４の評価の中で、すべての評価が〇のものを総合評価〇とし、評価の少なくとも一つが×のものは総合評価×とし、×の評価はないが△の評価が一つあり他の評価結果は〇のものを総合評価△として、その総合評価の結果も表１及表２に示す。
(comprehensive evaluation)
Among the evaluations of Test Examples 1 to 4 above, if all the evaluations are ○, the overall evaluation is ○, if at least one of the evaluations is ×, the overall evaluation is The results of other evaluations are shown in Tables 1 and 2, with ○ as an overall evaluation of △.
上記表１及び２より、本発明の実施例の無機系アンカー材料は、氷点下の環境においてもダレ性は良好で、適切な可使時間を有し、アンカー筋の引張強度等を良好に保持することが可能であることがわかる。
一方、無機系アンカー材料に含まれる超速硬性バインダー中の超速硬性鉱物組成が、本発明の範囲外の比較例１～５では、氷点下の環境においては、適切な可使時間を有することができないか、機械的強度が十分でないことが明らかである。
From Tables 1 and 2 above, the inorganic anchor materials of the examples of the present invention have good sag resistance even in sub-zero environments, have an appropriate pot life, and maintain good tensile strength of anchor bars. It turns out that it is possible.
On the other hand, Comparative Examples 1 to 5, in which the ultra-fast-hardening mineral composition in the ultra-fast-hardening binder contained in the inorganic anchor material is outside the scope of the present invention, may not have an appropriate pot life in a sub-zero environment. , it is clear that the mechanical strength is not sufficient.
また、亜硝酸塩の含有割合が本発明の範囲外の比較例６～７、本発明の亜硝酸塩以外の防凍剤を含む８～１３、防凍剤を含まない比較例１４、本発明の超速硬性バインダーを含まない比較例１５～１６のアンカー材料は、氷点下の環境においては、施工性が悪いか、機械的強度が十分でないことが明らかである。 In addition, Comparative Examples 6 to 7 in which the content ratio of nitrite is outside the range of the present invention, Comparative Examples 8 to 13 containing antifreeze other than nitrite of the present invention, Comparative Example 14 containing no antifreeze, and ultra-fast hardening binder of the present invention It is clear that the anchor materials of Comparative Examples 15 and 16, which do not contain , have poor workability or do not have sufficient mechanical strength in sub-zero environments.
本発明の耐寒用無機系アンカー材料は、寒冷場所における建築・土木分野におけるコンクリート構造物に設けた孔に、アンカー筋等のアンカー部材を強固に付着させることができ、適切な可使時間を有するため施工の作業効率が高く、特に寒冷地における構造物に有効に適用することができる。
The cold-resistant inorganic anchor material of the present invention can firmly attach anchor members such as anchor bars to holes made in concrete structures in the architecture and civil engineering fields in cold locations, and has an appropriate pot life. Therefore, construction work efficiency is high, and it can be effectively applied especially to structures in cold regions.
Claims (4)
The cold-resistant inorganic anchor material according to any one of claims 1 to 3 is contained in a cartridge, the cartridge is attached to an injection gun, and the cold-resistant inorganic anchor material is filled into holes in a concrete structure. A method for fixing an anchor member, the method comprising fixing the anchor member by curing the anchor member.
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