JP2009107894A - Cement based anchoring material - Google Patents
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- JP2009107894A JP2009107894A JP2007282713A JP2007282713A JP2009107894A JP 2009107894 A JP2009107894 A JP 2009107894A JP 2007282713 A JP2007282713 A JP 2007282713A JP 2007282713 A JP2007282713 A JP 2007282713A JP 2009107894 A JP2009107894 A JP 2009107894A
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Abstract
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本発明は、セメント系定着材に関し、特に、掘削面の崩壊を防ぐために地山に挿入されるロックボルトを早期に定着させるために用いるセメント系定着材に関する。 The present invention relates to a cement-based fixing material, and more particularly to a cement-based fixing material used for fixing a rock bolt inserted into a natural ground at an early stage in order to prevent collapse of an excavated surface.
一般に、山岳トンネル工事に際して、鋼製支保工、吹付けコンクリート、ロックボルトを主要な支保部材とする工法が標準的に採用されている。ロックボルトに関しては、地山補強効果が得られるため、山岳トンネル工事においては主に切羽補強工に用いられる（例えば特許文献１および特許文献２参照）。本明細書において、ロックボルトとは、鋼製、ガラス製もしくは樹脂製等の棒、単線、縒線、管又はこれらを組み合わせたものを含み、長尺ボルト、自穿孔型ロックボルト及びケーブルボルトも含む。
ロックボルトの定着方式は、ロックボルトの先端だけを定着させる先端定着方式と、ロックボルトと孔壁との間を全長にわたって定着させる全面定着方式がある。我が国では全面定着方式が一般的であり、全面定着方式はモルタルやセメントミルク、発泡樹脂などを使用する定着材方式とロックボルトを地山に密着させることによって生じる摩擦力を利用する摩擦方式に大別される。更に、定着材方式では、モルタルやセメントミルクなどの定着材を孔内に充填してからロックボルトを挿入・定着させる先充填方式と、先にロックボルトを挿入した後、定着材を注入して定着させる後注入方式に分けられる。
In general, when a mountain tunnel is constructed, a steel support method, shotcrete, and a rock bolt are used as the main support members. With respect to rock bolts, since the effect of reinforcing natural ground is obtained, it is mainly used for face reinforcement work in mountain tunnel construction (see, for example, Patent Document 1 and Patent Document 2). In this specification, the lock bolt includes a rod made of steel, glass, resin, etc., a single wire, a wire, a tube, or a combination thereof, and also includes a long bolt, a self-drilling lock bolt, and a cable bolt. Including.
The lock bolt fixing method includes a tip fixing method in which only the tip of the lock bolt is fixed, and a full surface fixing method in which the space between the lock bolt and the hole wall is fixed over the entire length. In Japan, the entire fixing method is generally used. The entire fixing method is a fixing method that uses mortar, cement milk, foamed resin, or the like, and a friction method that uses the frictional force generated when the lock bolt is brought into close contact with the ground. Separated. Furthermore, in the fixing material method, a fixing material such as mortar or cement milk is filled in the hole, and then a locking bolt is inserted and fixed, and after the locking bolt is first inserted, the fixing material is injected. It is divided into the post-injection method for fixing.
ロックボルトの芯材をモルタルやセメントミルクなどのセメント系定着材で定着させる一般的な定着材方式の場合、ロックボルト全体としての耐荷性能は、用いる定着材の強度発現特性に支配され、一般に若材齢時の耐荷力は小さい。セメント系定着材は強度発現に時間を要することが一般的であるため（例えば特許文献３及び特許文献４参照）、トンネルの切羽面等の掘削面が崩壊することを防ぐために、地山の掘削面にロックボルトを挿入しセメント系定着材で定着しても、掘削作業を行うことができるのは、セメント系定着材を穿孔に充填した翌日以降である。セメント系定着材を穿孔に充填した当日に掘削作業を行うと、ロックボルトが引抜けることがあった。
一方、セメント系定着材の硬化を早めるために、単に急硬材を添加しただけでは、定着材の注入時に目詰まりや充填不良等を起こしてしまうといった問題が起こる。
On the other hand, simply adding a quick hardening material to accelerate the hardening of the cement-based fixing material causes a problem such as clogging or filling failure when the fixing material is injected.
本発明は、セメント系定着材の注入時に目詰まりや充填不良を起こさずにロックボルトを穿孔に定着させることができ、且つセメント系定着材を穿孔に充填した当日に掘削作業を行った場合においてもロックボルトが引抜けることのないセメント系定着材を提供することを目的とする。 The present invention is capable of fixing a rock bolt to a perforation without causing clogging or filling failure when injecting a cement-based fixing material, and performing excavation work on the day when the cement-based fixing material is filled in the perforation. Another object of the present invention is to provide a cement-based fixing material in which a lock bolt is not pulled out.
本発明者は、前記課題解決のため鋭意検討した結果、特定のセメント系定着材を用いることにより、上記課題を解決できることを見出し、本発明を完成させた。
すなわち、本発明は、可使時間が５０分〜１５０分且つ材齢３時間の圧縮強度が６Ｎ／ｍｍ2以上である、セメント系定着材を提供するものである。
As a result of intensive studies for solving the above problems, the present inventors have found that the above problems can be solved by using a specific cement-based fixing material, and have completed the present invention.
That is, the present invention provides a cement-based fixing material having a pot life of 50 minutes to 150 minutes and a compressive strength of 6 N / mm 2 or more at a material age of 3 hours.
本発明のセメント系定着材を用いれば、セメント系定着材を穿孔に充填した当日に掘削作業を行った場合においてもロックボルトが引抜けることがないので、地盤の状態の悪い地山も、短期間に且つ安全に掘削することができる。また、セメント系定着材を注入する際に内径６ｍｍ程度の注入管を用いた場合においても、目詰まりや充填不良を起こさずに注入できるので、確実に且つ効率よくロックボルトを定着させることができる。 If the cement-based fixing material of the present invention is used, even if excavation work is performed on the same day that the cement-based fixing material is filled in the drilling hole, the rock bolt will not be pulled out. Drilling in between and safely. Further, even when an injection tube having an inner diameter of about 6 mm is used when injecting the cement-based fixing material, the injection can be performed without causing clogging or filling failure, so that the lock bolt can be fixed reliably and efficiently. .
本発明のセメント系定着材は、可使時間が５０分〜１５０分且つ材齢３時間の圧縮強度が６Ｎ／ｍｍ2以上である。
ここで、「可使時間」とは、水和開始から流動性がなくなる前までの時間を云い、流動性の有無はセメント系定着材を容器に入れこの容器を傾けることでセメント系定着材を別な容器に排出できるか否かで判断し、容器を傾けることで該容器内のセメント系定着材を別な容器に排出できる場合を「流動性あり」、できない場合を「流動性なし」と判断する。
また、「材齢３時間の圧縮強度」とは、土木学会基準 ＪＳＣＥ−Ｇ ５４１「充てんモルタルの圧縮強度試験方法」に準じて求める、水和開始から材齢３時間の圧縮強度を云う。なお、本発明において、特に断らない限り、材齢とは水和開始からの時間を云う。
The cement-type fixing material of the present invention has a pot life of 50 minutes to 150 minutes and a compressive strength of 6 N / mm 2 or more at a material age of 3 hours.
Here, “pot life” refers to the time from the start of hydration to the time before fluidity disappears. The presence or absence of fluidity is determined by placing the cement-based fixing material in a container and tilting the container. Judgment is made based on whether or not it can be discharged into another container, and when the container is tilted, the cement-based fixing material in the container can be discharged into another container. to decide.
The term “compressive strength at 3 hours of age” refers to the compressive strength at the age of 3 hours from the start of hydration determined according to JSCE-G 541 “Testing method for compressive strength of filled mortar”. In the present invention, unless otherwise specified, the age refers to the time from the start of hydration.
本発明において、セメント系定着材の可使時間が５０分未満であると、注入時に定着材がミキサ、圧送ポンプ、圧送管、継手、バルブ及び注入管等の定着材の経路内での目詰まりが起こる及び／又は穿孔内での定着材の充填不良を起こし易い。また、可使時間が１５０分を超えると、材齢３時間において掘削作業を行う場合にロックボルトが定着材から抜けたり、定着材ごと穿孔から抜けてしまう。従って、可使時間を５０分〜１５０分にすることにより、注入時における定着材の経路内での目詰まり及び穿孔内での定着材の充填不良を防ぐことができ、また良好な付着力が得られる。可使時間は、好ましくは６０分〜９０分である。 In the present invention, if the pot life of the cement-based fixing material is less than 50 minutes, the fixing material is clogged in the path of the fixing material such as a mixer, a pressure pump, a pressure feed pipe, a joint, a valve and an injection pipe at the time of injection. And / or poor filling of the fixing material in the perforations. Further, if the pot life exceeds 150 minutes, the rock bolt may come off from the fixing material or the fixing material may come out of the perforation when excavation work is performed at a material age of 3 hours. Therefore, by setting the pot life to 50 to 150 minutes, it is possible to prevent clogging in the path of the fixing material during filling and defective filling of the fixing material in the perforation, and good adhesion can be achieved. can get. The pot life is preferably 60 minutes to 90 minutes.
また、定着材のＪＩＳ Ｒ ５２０１「セメントの物理試験方法」のフロー試験に準じて測定した、フローコーン引き抜き直後のフロー値（１５回の落下運動前のフロー値）が、２５０〜４３０ｍｍであると、定着材のポンプ圧送性が良好であることから好ましい。 Further, the flow value immediately after drawing the flow cone (flow value before 15 dropping motions) measured according to the flow test of JIS R 5201 “Physical testing method for cement” of the fixing material is 250 to 430 mm. It is preferable because the pumping property of the fixing material is good.
一方、セメント系定着材の材齢３時間の圧縮強度が６Ｎ／ｍｍ2未満であると、定着材の耐荷力が小さいため、掘削作業を行うのが難しいが、材齢３時間の圧縮強度が６Ｎ／ｍｍ2以上であれば定着材の充填３時間後には掘削が可能となる。また、材齢２時間の圧縮強度が６Ｎ／ｍｍ2以上であれば、定着材の充填の２時間後には掘削が可能となるのでより好ましい。 On the other hand, if the compressive strength of the cement-based fixing material at 3 hours of age is less than 6 N / mm 2, it is difficult to perform excavation work because the load bearing capacity of the fixing material is small. If it is 6 N / mm 2 or more, excavation is possible 3 hours after filling with the fixing material. Further, if the compressive strength at the age of 2 hours is 6 N / mm 2 or more, excavation becomes possible 2 hours after filling with the fixing material, which is more preferable.
また、本発明において、セメント系定着材のＰ漏斗流下時間が、練り混ぜ直後から４０分間、１０〜２５秒であると、内径６ｍｍ程度の注入管を用いた場合においても注入時における定着材の経路内での目詰まりや、穿孔内での定着材の充填不良が起きずにセメント系定着材を穿孔に充填することができるため好ましい。Ｐ漏斗流下時間は、好ましくは練り混ぜ直後から４０分間、１０〜２０秒である。なお、Ｐ漏斗流下時間は、土木学会基準 ＪＳＣＥ−Ｆ ５２１「プレパクドコンクリートの注入モルタルの流動性試験方法（Ｐ漏斗による方法）」に準じて求められる。 Further, in the present invention, when the P funnel flow-down time of the cement-based fixing material is 10 minutes to 25 seconds for 40 minutes immediately after kneading, even when an injection tube having an inner diameter of about 6 mm is used, This is preferable because the cement-based fixing material can be filled in the perforation without causing clogging in the path or incomplete filling of the fixing material in the perforation. The P funnel flow time is preferably 10 to 20 seconds for 40 minutes immediately after mixing. In addition, P funnel flow-down time is calculated | required according to Japan Society of Civil Engineers standard JSCE-F 521 "The fluidity test method of the injection mortar of a pre-packed concrete (method by P funnel)."
本発明のセメント系定着材は、水硬性セメント、硬化促進剤、遅延剤及び増粘剤を含有する。
水硬性セメントとしては、例えば普通、早強、超早強、中庸熱、低熱ポルトランドセメント等のポルトランドセメントや、高炉セメント、アルミナセメント、或いは、都市ゴミ焼却灰や下水汚泥焼却灰等の廃棄物を原料として利用したエコセメント等が挙げられ、これらの一種又は二種以上を使用することができる。これらのうち、高い初期強度を得る観点から、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント及びエコセメントから選ばれる一種又は二種以上を使用することが好ましい。特に、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント及びエコセメントから選ばれる一種又は二種以上と、アルミナセメントとを併用することが、高い初期強度を得る観点からより好ましい。
The cement-based fixing material of the present invention contains a hydraulic cement, a curing accelerator, a retarder, and a thickener.
Examples of hydraulic cements include normal, early strong, very early strong, moderate heat, low heat Portland cement, etc., blast furnace cement, alumina cement, municipal waste incineration ash and sewage sludge incineration ash, etc. The eco-cement etc. which were utilized as a raw material are mentioned, These 1 type (s) or 2 or more types can be used. Among these, from the viewpoint of obtaining high initial strength, it is preferable to use one or more selected from ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement and eco-cement. In particular, it is more preferable to use alumina cement in combination with one or more selected from ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, and eco-cement from the viewpoint of obtaining high initial strength.
硬化促進剤としては、例えば石膏、アルカリ金属硫酸塩、炭酸リチウム等が挙げられる。
遅延剤としては、例えば酒石酸やクエン酸等のオキシカルボン酸又はその塩を主成分として含むもの、或いは炭酸ナトリウム等が挙げられる。
増粘剤としては、例えばヒドロキシメチルセルロースやヒドロキシプロピルセルロース等の水溶性セルロース；アルギン酸、β-１，３グルカン、プルラン、ウェランガム等の多糖類；アクリル樹脂やポリビニルアルコール等のポリビニル等が挙げられる。
Examples of the curing accelerator include gypsum, alkali metal sulfate, lithium carbonate and the like.
Examples of the retarder include those containing oxycarboxylic acid such as tartaric acid or citric acid or a salt thereof as a main component, or sodium carbonate.
Examples of the thickener include water-soluble cellulose such as hydroxymethyl cellulose and hydroxypropyl cellulose; polysaccharides such as alginic acid, β-1,3 glucan, pullulan and welan gum; polyvinyl such as acrylic resin and polyvinyl alcohol.
前記セメント系定着材には、上記の他に、流動性、付着力及び強度発現性の観点から、膨張材、消泡剤及び骨材から選ばれる一種又は二種以上を配合するのが好ましい。
膨張材としては、例えば石灰系膨張材、カルシウムサルホアルミネート系膨張材（アウイン系膨張材）等が好ましい。消泡剤としては、例えばポリエーテル系消泡剤、シリコーン系消泡剤等が好ましい。
In addition to the above, the cement-based fixing material preferably contains one or more selected from expansion materials, antifoaming agents, and aggregates from the viewpoints of fluidity, adhesion, and strength.
As the expansion material, for example, a lime-based expansion material, a calcium sulfoaluminate-based expansion material (auin-based expansion material) and the like are preferable. As the antifoaming agent, for example, a polyether antifoaming agent, a silicone antifoaming agent and the like are preferable.
骨材としては、例えば川砂、陸砂、海砂、砕砂、珪砂、石粉、川砂利、陸砂利、砕石及び人工骨材等が挙げられ、これらの一種又は二種以上を使用することができる。これらのうち、定着材の流動性を確保するために、川砂、陸砂、海砂、砕砂、珪砂及び人工軽量細骨材等の細骨材を使用することが好ましく、内径６ｍｍ程度の注入管を用いた場合においても、注入時に定着材の経路内での目詰まり及び穿孔内での定着材の充填不良を起こさずにセメント系定着材を穿孔に充填するために、０．６ｍｍの篩に留まる粒子が１重量％未満であることがより好ましい。 Examples of the aggregate include river sand, land sand, sea sand, crushed sand, quartz sand, stone powder, river gravel, land gravel, crushed stone, and artificial aggregate, and one or more of these can be used. Among these, in order to ensure the fluidity of the fixing material, it is preferable to use fine aggregates such as river sand, land sand, sea sand, crushed sand, silica sand, and artificial lightweight fine aggregate, and an injection tube having an inner diameter of about 6 mm. In order to fill the perforated cement-based fixing material without causing clogging in the path of the fixing material and poor filling of the fixing material in the perforation during injection, a 0.6 mm sieve is used. More preferably, the remaining particles are less than 1% by weight.
また、セメント系定着材には上記以外の混和材料を配合してもよい。この混和材料としては、例えば高性能減水剤、高性能ＡＥ減水剤、ＡＥ減水剤及び流動化剤を含むセメント分散剤、シリカフューム、高炉スラグ等の潜在水硬性物質、樹脂エマルション、起泡剤、発泡剤、防錆剤、顔料、繊維、撥水剤、防水材、急硬剤（材）、急結剤（材）、粉塵低減剤、収縮低減剤、水中不分離性混和剤等が挙げられ、これらの一種又は二種以上を本発明による効果を阻害しない範囲で使用することができる。 Further, an admixture other than the above may be blended in the cement-based fixing material. Examples of this admixture include high-performance water reducing agents, high-performance AE water reducing agents, cement dispersants containing AE water reducing agents and fluidizing agents, silica hydraulic fumes, latent hydraulic substances such as blast furnace slag, resin emulsions, foaming agents, foaming Agents, rust preventives, pigments, fibers, water repellents, waterproofing materials, quick hardening agents (materials), quick setting agents (materials), dust reducing agents, shrinkage reducing agents, underwater non-separable admixtures, etc. These 1 type (s) or 2 or more types can be used in the range which does not inhibit the effect by this invention.
本発明のセメント系定着材において、強度発現性及び所望のゲルタイムを確保する観点から、水硬性セメントの含有量は、水硬性セメント、骨材及び固形の混和材料の合計（以下単に「固形分」と云う）１００質量部に対して、３５〜７０質量部、硬化促進剤の含有量は５〜２０質量部、遅延剤の含有量は０．１〜０．５質量部、増粘剤の含有量は０．０３〜０．１質量部とするのが好ましい。
また、膨張材、消泡剤及び細骨材を配合する場合は、前記「固形分」１００質量部に対して、膨張剤の含有量を１〜３質量部、消泡剤の含有量を０．０５〜０．１５質量部、細骨材の含有量を１５〜５５質量部とするのが好ましい。
In the cement-based fixing material of the present invention, from the viewpoint of securing strength development and desired gel time, the content of hydraulic cement is the sum of hydraulic cement, aggregate and solid admixture (hereinafter simply referred to as “solid content”). 35) to 70 parts by mass with respect to 100 parts by mass, the content of the curing accelerator is 5 to 20 parts by mass, the content of the retarder is 0.1 to 0.5 parts by mass, the content of the thickener The amount is preferably 0.03 to 0.1 parts by mass.
Moreover, when mix | blending an expansion | swelling material, an antifoamer, and a fine aggregate, with respect to said "solid content" 100 mass parts, content of an expansion agent is 1-3 mass parts, content of an antifoamer is 0. 0.05 to 0.15 parts by mass, and the fine aggregate content is preferably 15 to 55 parts by mass.
本発明のセメント系定着材は、水と混合して用いられるが、混合する水の量は、前記固形分１００重量部に対し、３０〜４５質量部とするのが好ましい。この水としては、液体セメント分散剤や樹脂エマルション等の液状の混和材料に含まれる水分も考慮し、これらの水分も合わせた量とする。 The cement-based fixing material of the present invention is used by mixing with water, and the amount of water to be mixed is preferably 30 to 45 parts by mass with respect to 100 parts by weight of the solid content. In consideration of the water contained in the liquid admixture such as the liquid cement dispersant and the resin emulsion, the amount of water is also the combined amount.
本発明のセメント系定着材を製造する方法は、特に限定されず、例えば、水硬性セメント等の材料を、モルタルミキサやコンクリートミキサ等のミキサにより混練して製造できる。このとき用いるミキサは、連続式ミキサでもバッチ式ミキサでも良い。各材料の添加順序は特に限定されない。一種ずつ添加してもよく、一部又は全部を同時に添加してもよい。 The method for producing the cement-based fixing material of the present invention is not particularly limited, and for example, it can be produced by kneading a material such as hydraulic cement with a mixer such as a mortar mixer or a concrete mixer. The mixer used at this time may be a continuous mixer or a batch mixer. The order of adding each material is not particularly limited. One by one may be added, or part or all may be added simultaneously.
本発明のセメント系定着材を使用する方法は、特に限定されず、先充填方式及び後注入方式のどちらを用いても良い。また、用いるロックボルトの種類や材質、形状も特に限定されない。本発明のセメント系定着材は、例えばセメントペースト、セメントモルタル、ポリマーセメントモルタル、セメントコンクリート、ポリマーセメントコンクリート等として用いることができる。
定着材には１液型と２液型があり、２液型は強度発現が早いものの、定着材の調整や注入装置の取扱、操作に手間がかかり使用性が悪い。本発明のセメント系定着材は１液型の定着材であり、混練が容易で作業性に優れる。
The method for using the cement-based fixing material of the present invention is not particularly limited, and either a pre-filling method or a post-injection method may be used. Further, the type, material, and shape of the lock bolt to be used are not particularly limited. The cement-based fixing material of the present invention can be used as, for example, cement paste, cement mortar, polymer cement mortar, cement concrete, polymer cement concrete and the like.
There are 1-component type and 2-component type fixing materials, and the 2-component type has rapid strength development, but it takes time to adjust the fixing material, handle and operate the injection device, and the usability is poor. The cement-based fixing material of the present invention is a one-component fixing material, and is easy to knead and excellent in workability.
以下、本発明について実施例をあげて具体的に説明する。
［使用材料］
水硬性セメント１：太平洋セメント社製普通ポルトランドセメント（記号；ＯＰＣ）
水硬性セメント２：ラファージュアルミネート社製アルミナセメント（記号；ＡＣ）
硬化促進剤１：II型無水石膏（ブレーン比表面積：８０００ｃｍ2／ｇ）
硬化促進剤２：炭酸リチウム（試薬）
膨張材：太平洋マテリアル社製石灰系膨張材（商品名「太平洋Ｎ−ＥＸ」）
遅延剤１：クエン酸（工業用）
遅延剤２：ソーダ灰（工業用、主成分：炭酸ナトリウム）
増粘剤：信越化学工業社製ヒドロキシプロピルメチルセルロース（商品名「メトローズ９０ＳＨ３００００」）
細骨材１：珪砂（密度：２．６０ｇ／ｃｍ3，０．６ｍｍの篩を全通し且つ０．０７ｍｍの篩に留まる粒子が９５重量％）
細骨材２：石灰石微粉末（０．６ｍｍの篩を全通）
消泡剤：サンノプコ社製ＳＮディフォーマＡＨＰ
高性能減水剤：ＢＡＳＦポゾリス社販売商品名「メルメントＦ１０」
Hereinafter, the present invention will be described in detail with reference to examples.
[Materials used]
Hydraulic cement 1: Ordinary Portland cement (symbol: OPC) made by Taiheiyo Cement
Hydraulic cement 2: Alumina cement (symbol; AC) manufactured by Lafarge Aluminate
Curing accelerator 1: Type II anhydrous gypsum (Blaine specific surface area: 8000 cm 2 / g)
Curing accelerator 2: Lithium carbonate (reagent)
Expansion material: Taiheiyo Material Co., Ltd. lime-based expansion material (trade name "Pacific N-EX")
Retarder 1: Citric acid (for industrial use)
Retardant 2: Soda ash (industrial, main component: sodium carbonate)
Thickener: Hydroxypropyl methylcellulose (trade name “Metroise 90SH30000”) manufactured by Shin-Etsu Chemical Co., Ltd.
Fine aggregate 1: Silica sand (density: 2.60 g / cm 3 , 95% by weight of particles that pass through a 0.6 mm sieve and remain on the 0.07 mm sieve)
Fine aggregate 2: Limestone fine powder (through 0.6mm sieve)
Defoamer: SN deformer AHP manufactured by San Nopco
High-performance water-reducing agent: Brand name “Melment F10” sold by BASF Pozzolith
表１に示す配合の各種セメント系定着材を作製した。この作製した各セメント系定着材について、可使時間、Ｐ漏斗流下時間、モルタルフロー及び圧縮強度を測定し、模擬孔への充填性・引抜き試験を行った。 Various cement-based fixing materials having the formulations shown in Table 1 were prepared. About each produced cementitious fixing material, pot life, P funnel flow time, mortar flow, and compressive strength were measured, and the filling property to a simulated hole and a drawing test were performed.
［可使時間］
可使時間は、セメント系定着材をポリビーカーに入れこのポリビーカーを傾けることでセメント系定着材を別なポリビーカーに排出できる、即ち「流動性あり」の状態である、水和開始からの時間とした。
［Ｐ漏斗流下時間］
Ｐ漏斗流下時間は、土木学会基準 ＪＳＣＥ−Ｆ ５２１「プレパクドコンクリートの注入モルタルの流動性試験方法（Ｐ漏斗による方法）」に従って測定した。
［モルタルフロー］
モルタルフローは、ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」のフロー試験に準じて、フローコーン引き抜き直後のフロー値（１５回の落下運動前のフロー値）を測定した。
［圧縮強度］
土木学会基準 ＪＳＣＥ−Ｇ ５４１「充てんモルタルの圧縮強度試験方法」に準じて、材齢２時間及び材齢３時間の圧縮強度を求めた。
[Pot life]
The pot life can be determined by placing the cement-based fixing material in a poly beaker and tilting the poly beaker so that the cement-based fixing material can be discharged into another poly beaker. It was time.
[P funnel flow time]
The P funnel flow-down time was measured according to the Japan Society of Civil Engineers standard JSCE-F 521 “Testing method for fluidity of mortar of pre-packed concrete (method using P funnel)”.
[Mortar flow]
The mortar flow was measured in accordance with the flow test of JIS R 5201 “Cement physical test method”, and the flow value immediately after drawing the flow cone (flow value before 15 drop motions) was measured.
[Compressive strength]
According to JSCE-G 541 “Testing method for compressive strength of filling mortar”, compressive strength at a material age of 2 hours and a material age of 3 hours was determined.
［模擬孔への充填性・引抜き試験］
内径１００ｍｍ、長さ２００ｍｍの鋼管を模擬孔として、その内部に模擬ロックボルトとして外径７６ｍｍ、溝加工付きの鋼管（定着長さ２００ｍｍ）を挿入し、注入ポンプを用いてセメント系定着材を充填することで、引抜き試験体を作製した。このとき、内径６ｍｍの注入管を用いセメント系定着材を充填した。引抜き試験体を所定の材齢まで静置養生し、その後、万能試験機によって、付着強度０．３Ｎ／ｍｍ2となる引抜き荷重（１４ｋＮ）を引抜き試験体に掛け、模擬ロックボルトが模擬孔から抜けるか否かを確認した。
[Fillability / pull-out test for simulated holes]
A steel pipe with an inner diameter of 100 mm and a length of 200 mm is used as a simulated hole, and a steel pipe with an outer diameter of 76 mm and a groove (fixing length of 200 mm) is inserted as a simulated lock bolt inside, and filled with cement-based fixing material using an injection pump. As a result, a pull-out specimen was produced. At this time, a cement-based fixing material was filled using an injection tube having an inner diameter of 6 mm. The pull-out specimen is allowed to stand until it reaches a predetermined age, and then a pull-out load (14 kN) with an adhesion strength of 0.3 N / mm 2 is applied to the pull-out specimen using a universal testing machine, and a simulated rock bolt is inserted from the simulated hole. I checked whether it was possible to exit.
表３に示すとおり、本発明のセメント系定着材（Ｎｏ．１〜３）は、何れも注入時に目詰まりや充填不良を起こさず、材齢２時間でロックボルトが抜けることがない程度の優れた付着力を示した。 As shown in Table 3, the cement-based fixing material (Nos. 1 to 3) of the present invention is excellent enough to prevent clogging or filling failure at the time of injection and to prevent the lock bolt from coming out in 2 hours of material age. Showed good adhesion.
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| JP2016179921A (en) * | 2015-03-24 | 2016-10-13 | 住友大阪セメント株式会社 | Inorganic anchor material and anchorage method of anchor bar using anchor material |
| JP2017165628A (en) * | 2016-03-17 | 2017-09-21 | 太平洋マテリアル株式会社 | Quick hardening grout composition |
| CN108609973A (en) * | 2018-06-05 | 2018-10-02 | 长安大学 | A kind of high-strength fast hard injecting paste material for strengthening stratum |
| JP2019019022A (en) * | 2017-07-14 | 2019-02-07 | 日油技研工業株式会社 | Hydraulic composition and anchor element fixing method using the same |
| JP2020019658A (en) * | 2018-07-30 | 2020-02-06 | 太平洋マテリアル株式会社 | Grout mortar composition, grout mortar, concrete structure, and production method for the same |
| JP2020055748A (en) * | 2016-03-17 | 2020-04-09 | 太平洋マテリアル株式会社 | Rapid hardening grout composition |
| JP2020172409A (en) * | 2019-04-11 | 2020-10-22 | 株式会社トクヤマ | mortar |
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| JP7231465B2 (en) | 2019-04-11 | 2023-03-01 | 株式会社トクヤマ | mortar |
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