JP4115288B2 - Water stop material for steel sheet pile joints - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、遮水性護岸工事、埋立て工事、堤防構築工事、地下壁工事、擁壁工事等に用いられる、鋼矢板、鋼管矢板、Ｈ型鋼矢板等の鋼製矢板の継手部の止水材に関するものである。
【０００２】
【従来の技術】
従来、鋼製矢板は、雄継手と雌継手からなる継手部を連結して配置される。継手部には、モルタル、アスファルト混合物等の止水材が充填され、この止水材により保有水が継手部を透過しないように構成される。この継手部の止水法としては、鋼製矢板を打ち込んだ後、継手部の中空部ウォータージェット等により洗浄し、モルタル、アスファルト混合物等の止水材を充填する方法が実施されている。
また、鋼製矢板を地中に打ち込む前に、嵌合継手内にアタクチックポリプロピレンを主成分とし、重油、ブタジエンゴム溶液を添加した止水材を充填しておく鋼製矢板の継手部の止水方法が開示されている（例えば、特許文献１参照。）。
さらに、鋼製矢板継手部の止水材として無機質細粒を混合した比重１．５〜２．５のアスファルトコンパウンドを使用する構成が開示されている（例えば、特許文献２参照。）。
【０００３】
【特許文献１】
特開昭５２−１２１９０７号公報
【特許文献２】
実開平２−２３０２６号公報
【０００４】
【発明が解決しようとする課題】
鋼製矢板の打設後に継手部内に止水材を充填する従来例では、継手部内に浸入した土砂をウォータージェット等により完全に除去することは非常に困難であり、また、一旦浸入した土砂を除去したとしても、洗浄後に止水材を充填するまでの間に嵌合継手のスリット部分より再度土砂が侵入するため、止水材に土砂が混じり止水材の品質低下につながり、止水性能が低下するという問題が発生する。また、鋼製矢板の継手部に止水材としてのアスファルト混合物を充填する場合、アスファルト混合物の温度を水温の沸点以上に加熱して流動化させて充填するため、充填されるアスファルト混合物が継手部内の地下水あるいは海水を閉塞し、水蒸気爆発を起こす危険性がある。
特許文献１では、止水材の主成分であるアタクチックポリプロピレンは、結晶化度が低いため抗酸化性が小さいため、長期的な耐久性に乏しく、打設持の抵抗は低減されるものの、止水性を確保する上での常温での長期的な流動性が十分でなく、継手が形成された後、継手に曲げ変形が作用し、継手が離れる方向に変形すると、継手と止水材との間に隙間が生じることになり、その個所から漏水するという問題が発生する。また、止水材に添加される重油の油分が周辺地下水や外海に溶出する懸念がある。
特許文献２では、鋼製矢板の止水材としてアスファルトコンパウンド若しくはゴムアスファルトコンパウンドを２０重量％と、直径８〜１３ｍｍ程度の無機砕石及び無機粉末を８０重量％とを混合して比重１．５〜２．５とし、針入度が５０としたものであるが、止水性を確保する上での常温での長期的な流動性が十分でなく、継手が形成された後、継手に曲げ変形が作用し、継手が離れる方向に変形すると、継手と止水材との間に隙間が生じることになり、流動性に乏しいため自己充填性がなく、その個所から漏水するという問題が発生する。
【０００５】
本発明は、鋼製矢板の打設前に継手部に充填される止水材を、水又は海水の浮力により浮き上がることがない比重を有し、且つ嵌合継手と止水材との間に生じるズレや隙間を自己充填する流動性を有するものとし、前述の従来例の持つ課題を解決することを目的とするものである。
【０００６】
【課題を解決するための手段】
本第１発明は、前記課題を解決するために、一対の嵌合継手を止水用充填材を介して互いに嵌合させながら鋼矢板、鋼管矢板及びＨ型鋼矢板等の鋼製矢板を打設する継手の止水材であって、前記鋼製矢板の打設前に、継手空間に予め充填される止水材が、全量の４０重量％以下の無機物添加材によりその密度を１．１ｇ／ｃｍ３以上、１．５ｇ／ｃｍ３未満に調整されたアスファルトコンパウンドであり、当該アスファルトコンパウンドは、鋼製半円柱（９）に温度８５℃で流し込み、１０℃、２０℃の恒温槽中に垂直に立て、下端からアスファルトコンパウンドの流動を測定した場合に、１週間当たりの流動距離が５ｍｍ以上２００ｍｍ未満であって、前記アスファルトコンパウンドの無機物添加材が、粒度試験において、１５０μｍ篩の通過量が９５質量％以上であることを特徴とする。
【０００７】
本第２発明は、本第１発明の鋼製矢板継手部の止水材において、前記アスファルトコンパウンドが、２５℃における針入度６０以上１５０以下、１００℃における絶対粘度が８Ｐａ．ｓ以上、４０Ｐａ．ｓ以下、鋼製矢板の継手部に充填する温度が１００℃未満であることを特徴とする。
【０００９】
【作用】
本発明においては、予め鋼製矢板の継手空間に止水材が充填されているため、従来のように継手空間の浸入土砂の除去作業の必要がなく、止水材に土砂が混ざることがなく止水材の品質が確保される。
止水材として、全量の４０重量％以下の無機物添加材の添加により密度が１．１ｇ／ｃｍ3以上、１．５ｇ／ｃｍ3未満に調整されたアスファルトコンパウンドを用いることにより、長期的流動性を保ちつつ、密度差により海水を排除し、さらに、アスファルトコンパウンドの２５℃における針入度を６０以上１５０以下とすることで、これら止水材が供用される温度域での適当な流動性を発現することができる。
止水材の１００℃における絶対粘度が８Ｐａ．ｓ以上４０Ｐａ．ｓ以下とすることで、１００℃以下の嵌合継手への止水材充填時の流動性を確保でき、１００℃以下での充填作業なので作業の危険性を低減できる。
止水材としてのアスファルトコンパウンドに用いる無機物添加材が、粒度試験において、１５０μｍ篩の通過量が９５質量％以上とすることにより、アスファルト中に無機物添加材を均一に分散でき、充填後の止水材内部のズレや隙間を自己充填する適切な流動性が得られる。
【００１０】
【発明の実施の形態】
本発明の実施形態を図により説明する。図１に示されるように、鋼管矢板等の鋼製矢板１の嵌合継手（Ｐ−Ｔ型）は、Ｔ型形状の雄継手２と、縦方向に嵌合用のスリット４が形成された円形のポケットを有する雌継手３により構成され、雌継手３のポケットに予め本発明のアスファルトコンパウンドから構成される止水材５が充填される。図２に示される鋼管矢板等の鋼製矢板１の嵌合継手（Ｐ−Ｐ型）は、雄継手６、雌継手７ともにスリット８が形成された円形鋼管で構成され、円形鋼管からなる雌継手７内に予め本願発明のアスファルトコンパウンドから構成される止水材５が充填される。本発明は、鋼製矢板１としては、Ｕ形鋼矢板やＨ型鋼矢板の嵌合継手にも適用可能である。図３（ａ）（ｂ）（ｃ）に嵌合継手の他の実施形態を示す。図３（ａ）に示される嵌合継手は、Ｐ−Ｔ型の雌継手３を角形にしたものであり、図３（ｂ）に示される嵌合継手は、Ｐ−Ｔ型の雄継手２をＵ字形としたものであり、図３（ｃ）は、Ｕ形鋼矢板のラルゼン形の嵌合継手を示す。いずれの嵌合継手にも、本発明の止水材５を予め充填しておく。
【００１１】
本発明の止水材５としてアスファルトコンパウンドは、全量の４０重量％以下の無機物添加材によりその密度を１．１ｇ／ｃｍ3以上、１．５ｇ／ｃｍ3未満、望ましくは１．１５ｇ／ｃｍ3以上、１．４ｇ／ｃｍ3未満とすることで密度差により海水を排除し、自己充填性を確保する。止水材５の密度が１．１ｇ／ｃｍ3未満である場合、海水密度（約１．０３ｇ／ｃｍ3）との差が小さくなり、止水材５内部のズレや隙間を、浸入した海水を排除し自己充填することができなくなる。また、止水材５の密度が１．５ｇ／ｃｍ3以上の場合、すなわち無機物添加材の配合量が多く、アスファルトの配合量が少ない場合、長期にわたる供用において水密性の確保が困難となり、止水材５の粘度も上昇することから、充填作業の作業性が悪化し、さらに空隙が生じた場合の自己充填性の確保が困難となる。アスファルトコンパウンドの密度は１５℃で測定されたものである。
無機物添加材としては、炭酸カルシウム、シリカ、アルミナ、マグネシア、酸化カリウム、酸化鉄、酸化ナトリウム等の微粉末、若しくはその混合物であるタルク、珪砂、砕石、石粉、カオリンクレー、マイカ、ベントナイトさらに鉱滓等を用いることができる。
【００１２】
本発明の止水材５としてのアスファルトコンパウンドは、ＪIＳ Ｋ ２２０７に規定される２５℃における針入度６０以上１５０以下、望ましくは６５以上１３０以下とすることで、止水材５が供用される温度域での適当な流動性を発現できる。止水材５の針入度が６０より小さい場合、止水材５の供用される温度域での粘度が高くなり、適当な流動性を持たなくなり、止水材５内部のズレや隙間に浸入した海水を排除し自己充填することができなくなる。さらに止水材５の柔軟性も低下することから、止水材５内部のズレに追随することができなくなり、長期にわたる供用において水密性の確保が困難になる恐れがある。また止水材５の針入度が１５０より大きい場合、止水材５の供用される温度域での粘度が低くなり、供用時に止水材５内部で材料分離を生じる可能性があり、長期にわたる供用において水密性の確保が困難になる恐れがある。
【００１３】
本発明の止水材５としてのアスファルトコンパウンドは、１００℃における絶対粘度が８Ｐａ．ｓ以上４０Ｐａ．ｓ以下とすることにより、１００℃以下の安全な作業温度でも流動性を確保でき、嵌合継手の最上部を現場で充填するに際しても、周辺の水分による水蒸気爆発を起こさず、不要な空隙を生じさせない。
１００℃での絶対粘度が８Ｐａ．ｓ未満の場合、施工中に止水材５中のアスファルトと無機添加材の分離が起こり、供用時に所定の性能が得られない。また、１００℃での絶対粘度が４０Ｐａ．ｓより高いと、止水材５の流動性が乏しいため充填作業が困難となる。ここで作業性改善のため止水材５の温度を上昇させることは、充填する際に周辺の水分による水蒸気爆発の危険を生じることになる。
【００１４】
本発明の無機物添加材は、微粒子であることが望ましく、ＪＩＳ Ａ ５００８に示される粒度試験において１５０μｍふるいの通過量が９５質量％以上であることを規定する。無機物添加材の１５０μｍふるいの通過量が９５質量％未満の場合、すなわち粒子径の大きな無機物が多く存在した場合、アスファルト中に無機物添加材を均一に分散することが困難になり、さらに止水材５の施工作業時にアスファルトと無機物添加材が分離し、供用後の止水材５内部のズレや隙間を自己充填する適切な流動性が得られなくなる。
また上記無機物添加材とアスファルト、および鋼製矢板１の継手部分の接着性の改善のため、極性基を有する化学物質（例えば、酸、アミン等）を添加することができる。
【００１５】
【実施例】
以下に実施例、比較例をあげて本発明を説明するが、本発明はこの実施例により制限されるものではない。
各実施例および比較例は表１に示す材料を、ＪＩＳ Ａ １１１０に示される方法で分離試験を実施し、さらに図４に示す鋼製半円柱９に温度８５℃でアスファルトコンパウンドを流し込み、１０℃、２０℃の恒温槽中に垂直に立て、下部のアスファルトコンパウンドの流動を観察した。図３中、１０は支え鋼板、１１は、アスファルトコンパウンドの流動性を確認するためのアクリル製半円柱である。この時の下端からのアスファルトコンパウンドの流動距離を測定し、１週間当たりの流動距離が１ｍｍ未満を過小、１週間当たりの流動距離が１ｍｍ以上５ｍｍ未満を小、１週間当たりの流動距離が５ｍｍ以上２００ｍｍ未満を適切、１週間当たりの流動距離が２００ｍｍ以上を大と評価した。また、大のうち、２４時間当たりの流動距離が２００ｍｍ以上のものについては過大とした。それらの結果を表２に示す。
【００１６】
【表１】
【００１７】
【表２】
【００１８】
表２からみて、実施例１のアスファルトコンパウンドは、施工性が良く、材料分離が発生せず、さらに１０℃恒温槽における流動は若干小さいが、２０℃恒温槽における流動が適切であることから、温暖地域（例えば九州、沖縄地方等）の止水材として適用可能である。
実施例２のアスファルトコンパウンドは、施工性がよく、材料分離が発生せず、さらに、１０℃、２０℃恒温槽における流動とも適切であることから、中庸温度地域（例えば、東海、関東地方等）の止水材として適用可能である。
実施例３のアスファルトコンパウンドは、施工性がよく、材料分離が発生せず、さらに、２０℃恒温槽における流動は若干大きいが、１０℃恒温槽における流動も適切であることから、寒冷地域（例えば、東北地方以北等）の止水材として適用可能である。
比較例１のアスファルトコンパウンドは、密度は適切だが、針入度が高く、粘度が低い材料である。施工性は良好であるが、粘度が低いため、材料分離が発生し、さらに流動も大きくなっており、実際の止水材として適用は不可能であると思われる。
比較例２のアスファルトコンパウンドは、密度が大きく、粘度が高い材料である。施工性は粘度が高いため不良であり、施工温度を上げる必要があった。また材料分離は起こらないが、流動が起きず自己充填性がないと判断され、実際の止水材としての適用は不可能であると思われる。
【００１９】
【発明の効果】
本発明においては、予め鋼製矢板の継手空間に止水材が充填されているため、従来のように継手空間の浸入土砂の除去作業の必要がなく、止水材に土砂が混ざることがなく止水材の品質が確保される。
止水材として、全量の４０重量％以下の無機物添加材の添加により密度が１．１ｇ／ｃｍ3以上、１．５ｇ／ｃｍ3未満に調整されたアスファルトコンパウンドを用いることにより、長期的流動性を保ちつつ、密度差により海水を排除し、さらに、アスファルトコンパウンドの２５℃における針入度を６０以上１５０以下とすることで、これら止水材が供用される温度域での適当な流動性を発現することができる。
止水材の１００℃における絶対粘度が８Ｐａ．ｓ以上４０Ｐａ．ｓ以下とすることで、１００℃以下の嵌合継手への止水材充填時の流動性を確保でき、１００℃以下での充填作業なので作業の危険性を低減できる。
止水材としてのアスファルトコンパウンドに用いる無機物添加材が、粒度試験において、１５０μｍ篩の通過量が９５質量％以上とすることにより、アスファルト中に無機物添加材を均一に分散でき、充填後の止水材内部のズレや隙間を自己充填する適切な流動性が得られる。
【図面の簡単な説明】
【図１】 本発明の鋼製矢板の嵌合継手の一実施形態を示す図。
【図２】 本発明の鋼製矢板の嵌合継手の他の実施形態を示す図。
【図３】 （ａ）（ｂ）（ｃ）本発明の鋼製矢板の嵌合継手の他の実施形態を示す図。
【図４】 アスファルトコンパウンドの流動試験装置を示す図。
【符号の説明】
１：鋼製矢板
２：雄継手
３：雌継手
４：スリット
５：止水材
６：雄継手
７：雌継手
８：スリット
９：鋼製半円柱
１０：支え鋼板
１１：アクリル製半円柱[0001]
BACKGROUND OF THE INVENTION
The present invention is a waterproof material for joints of steel sheet piles, such as steel sheet piles, steel pipe sheet piles, H-type steel sheet piles, etc., used for water-impervious revetment work, landfill work, embankment construction work, underground wall work, retaining wall work, etc. It is about.
[0002]
[Prior art]
Conventionally, a steel sheet pile is arranged by connecting a joint portion composed of a male joint and a female joint. The joint portion is filled with a water-stopping material such as mortar and asphalt mixture, and the water-holding material is configured so that the retained water does not pass through the joint portion. As a water-stopping method for this joint, a method of filling a water-stopping material such as a mortar or asphalt mixture after driving a steel sheet pile and washing with a hollow water jet or the like of the joint.
In addition, before driving the steel sheet pile into the ground, the joint of the steel sheet pile is filled with a water stop material containing atactic polypropylene as a main component and heavy oil and butadiene rubber solution in the fitting joint. A water method is disclosed (for example, refer to Patent Document 1).
Furthermore, the structure which uses the asphalt compound of the specific gravity 1.5-2.5 which mixed the inorganic fine grain as a water stop material of steel sheet pile joint parts is disclosed (for example, refer patent document 2).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 52-121907 [Patent Document 2]
Japanese Utility Model Publication No. 2-23026
[Problems to be solved by the invention]
In the conventional example in which a water-stopping material is filled into the joint after the steel sheet pile is placed, it is very difficult to completely remove the soil that has entered the joint with a water jet or the like. Even if it is removed, the soil and sand will enter again through the slits of the fitting joint before it is filled with the water-stopping material. This causes a problem of lowering. In addition, when filling the asphalt mixture as a water-stopping material in the joint portion of the steel sheet pile, the asphalt mixture is heated and fluidized by heating to a temperature equal to or higher than the boiling point of the water temperature. There is a risk of causing a water vapor explosion by blocking the groundwater or seawater.
In Patent Document 1, atactic polypropylene, which is the main component of the water-stopping material, has a low degree of crystallinity and thus has low antioxidant properties, so that long-term durability is poor, and the resistance of placing and holding is reduced. Long-term fluidity at room temperature is not enough to ensure water-stopping, and after the joint is formed, bending deformation acts on the joint, and when the joint is deformed in the direction of separating, the joint and water-stopping material There will be a gap between the two, causing the problem of water leakage from that location. In addition, there is a concern that the oil content of heavy oil added to the water-stopping material will elute into the surrounding groundwater and the open sea.
In Patent Document 2, 20 wt% of asphalt compound or rubber asphalt compound as a water-stopping material for steel sheet piles, and 80 wt% of inorganic crushed stone and inorganic powder having a diameter of about 8 to 13 mm are mixed to give a specific gravity of 1.5 to 2.5 and the penetration is 50, but long-term fluidity at room temperature is not sufficient to ensure water-stopping, and after the joint is formed, the joint is bent and deformed. When acting and deforming in a direction in which the joint is separated, a gap is generated between the joint and the water-stopping material. Since the fluidity is poor, there is no self-filling property, causing a problem that water leaks from the location.
[0005]
The present invention has a specific gravity that prevents the water-stopping material filled in the joint before the steel sheet pile is placed from floating due to the buoyancy of water or seawater, and between the fitting joint and the water-stopping material. It is intended to solve the problems of the above-described conventional example by having a fluidity that self-fills the generated gap and gap.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the first invention places a steel sheet pile such as a steel sheet pile, a steel pipe sheet pile, and an H-type steel sheet pile while fitting a pair of fitting joints with each other through a water-stop filler. The water-stopping material for the joint is a water-stopping material that is prefilled in the joint space before the steel sheet pile is placed, and the density of the water-stopping material is 1.1 g / min. cm 3 or more and asphalt compound which is adjusted to less than 1.5 g / cm 3, the asphalt compound is a steel semi-cylindrical (9) poured at a temperature 85 ° C., 10 ° C., vertically in a constant temperature bath at 20 ° C. When the flow of asphalt compound is measured from the lower end, the flow distance per week is not less than 5 mm and less than 200 mm, and the asphalt compound inorganic additive is a 150 μm sieve in the particle size test. The passing amount is 95% by mass or more.
[0007]
According to the second invention, in the waterstop material of the steel sheet pile joint of the first invention, the asphalt compound has a penetration of 60 to 150 at 25 ° C and an absolute viscosity of 8 Pa. At 100 ° C. s or more, 40 Pa. s or less, the temperature which fills the joint part of a steel sheet pile is less than 100 degreeC, It is characterized by the above-mentioned.
[0009]
[Action]
In the present invention, since the water-stopping material is filled in the joint space of the steel sheet pile in advance, there is no need to remove the infiltration soil in the joint space as in the prior art, and the water-stopping material is not mixed with earth and sand. The quality of the waterstop material is ensured.
As water stopping material, density of 1.1 g / cm 3 or more by the addition of 40 wt% or less of the inorganic additive in the total amount, by using the asphalt compound, which is adjusted to less than 1.5 g / cm 3, long-term fluidity In addition, the seawater is eliminated due to the density difference, and the penetration of the asphalt compound at 25 ° C. is set to 60 or more and 150 or less, so that appropriate fluidity in the temperature range in which these water-stopping materials are used can be obtained. Can be expressed.
The absolute viscosity of the waterstop material at 100 ° C. is 8 Pa.s. s or more and 40 Pa. By setting it as s or less, the fluidity | liquidity at the time of the water-stopping material filling to the fitting joint of 100 degrees C or less can be ensured, and since it is filling work at 100 degrees C or less, the danger of an operation | work can be reduced.
The inorganic additive used in the asphalt compound as a water-stopping material can disperse the inorganic additive uniformly in the asphalt by making the passage amount of the 150 μm sieve 95% by mass or more in the particle size test. Appropriate fluidity can be obtained to self-fill the gaps and gaps inside the material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a fitting joint (PT type) of a steel sheet pile 1 such as a steel pipe sheet pile is a circular shape in which a male joint 2 having a T shape and a slit 4 for fitting are formed in a vertical direction. The pockets of the female joint 3 are preliminarily filled with the water stop material 5 made of the asphalt compound of the present invention. The fitting joint (PP type) of the steel sheet pile 1 such as the steel pipe sheet pile shown in FIG. 2 is composed of a circular steel pipe in which a slit 8 is formed in both the male joint 6 and the female joint 7, and is a female made of a circular steel pipe. The joint 7 is preliminarily filled with a water stop material 5 composed of the asphalt compound of the present invention. The steel sheet pile 1 can also be applied to a fitting joint of a U-shaped steel sheet pile or an H-shaped steel sheet pile. 3A, 3B and 3C show another embodiment of the fitting joint. The fitting joint shown in FIG. 3A is obtained by making a PT female joint 3 into a square shape, and the fitting joint shown in FIG. 3B is a PT male joint 2. Is a U-shape, and FIG. 3C shows a larsen-shaped fitting joint of a U-shaped steel sheet pile. Any fitting joint is pre-filled with the water stop material 5 of the present invention.
[0011]
The asphalt compound as the waterstop material 5 of the present invention has a density of 1.1 g / cm 3 or more and less than 1.5 g / cm 3 , preferably 1.15 g / cm 3 , with 40% by weight or less of the inorganic additive. As mentioned above, by setting it as less than 1.4 g / cm < 3 >, seawater is excluded by a density difference and self-filling property is ensured. When the density of the water-stopping material 5 is less than 1.1 g / cm 3 , the difference from the seawater density (about 1.03 g / cm 3 ) becomes small, and the seawater that has entered the gap or gap in the water-stopping material 5 has entered. Eliminates self-filling. In addition, when the density of the water-stopping material 5 is 1.5 g / cm 3 or more, that is, when the amount of the inorganic additive is large and the amount of the asphalt is small, it is difficult to ensure water tightness for long-term use. Since the viscosity of the water material 5 also increases, the workability of the filling operation is deteriorated, and it is difficult to ensure the self-filling property when voids are generated. The asphalt compound density was measured at 15 ° C.
Inorganic additives include fine powders such as calcium carbonate, silica, alumina, magnesia, potassium oxide, iron oxide, sodium oxide, or mixtures thereof such as talc, quartz sand, crushed stone, stone powder, kaolin clay, mica, bentonite, ore, etc. Can be used.
[0012]
The asphalt compound as the waterstop material 5 of the present invention has a penetration of 60 to 150, preferably 65 to 130, at 25 ° C. as defined in JIS K 2207, so that the waterstop material 5 is used. Appropriate fluidity in the temperature range can be expressed. When the penetration of the water-stopping material 5 is less than 60, the viscosity of the water-stopping material 5 increases in the temperature range in which the water-stopping material 5 is used, and it does not have an appropriate fluidity, and enters the gap or gap in the water-stopping material 5. The seawater that has been removed cannot be self-filled. Furthermore, since the flexibility of the water-stopping material 5 is also reduced, it becomes impossible to follow the displacement inside the water-stopping material 5, and it may be difficult to ensure watertightness for long-term use. Moreover, when the penetration of the water-stopping material 5 is larger than 150, the viscosity in the temperature range in which the water-stopping material 5 is used becomes low, and there is a possibility that material separation occurs inside the water-stopping material 5 during use. There is a risk that it will be difficult to ensure watertightness in service.
[0013]
The asphalt compound as the waterstop material 5 of the present invention has an absolute viscosity at 100 ° C. of 8 Pa.s. s or more and 40 Pa. By setting it to s or less, fluidity can be secured even at a safe working temperature of 100 ° C. or less, and when filling the uppermost part of the fitting joint on-site, a water vapor explosion due to surrounding moisture does not occur and unnecessary voids are formed. Don't make it happen.
The absolute viscosity at 100 ° C. is 8 Pa. If it is less than s, the asphalt and the inorganic additive in the water-stopping material 5 are separated during construction, and a predetermined performance cannot be obtained at the time of use. The absolute viscosity at 100 ° C. is 40 Pa.s. If it is higher than s, the fluidity of the water-stopping material 5 is poor and the filling operation becomes difficult. Here, raising the temperature of the water-stopping material 5 for improving workability creates a risk of steam explosion due to surrounding water when filling.
[0014]
The inorganic additive of the present invention is desirably fine particles, and specifies that the passing amount of a 150 μm sieve is 95% by mass or more in the particle size test shown in JIS A 5008. When the amount of the inorganic additive added through the 150 μm sieve is less than 95% by mass, that is, when there are many inorganic substances having a large particle size, it becomes difficult to uniformly disperse the inorganic additive in the asphalt, and further, the water stopping material Asphalt and the inorganic additive are separated during the construction work 5, and the proper fluidity for self-filling the gap or gap inside the water-stopping material 5 after use cannot be obtained.
Moreover, in order to improve the adhesiveness of the said inorganic substance addition material, asphalt, and the joint part of the steel sheet pile 1, the chemical substance (for example, an acid, an amine, etc.) which has a polar group can be added.
[0015]
【Example】
Hereinafter, the present invention will be described with reference to examples and comparative examples, but the present invention is not limited to these examples.
In each example and comparative example, the material shown in Table 1 was subjected to a separation test by the method shown in JIS A 1110, and an asphalt compound was poured into a steel half cylinder 9 shown in FIG. The vertical asphalt compound flow was observed in a 20 ° C. constant temperature bath. In FIG. 3, 10 is a supporting steel plate, and 11 is an acrylic semi-cylinder for confirming the fluidity of the asphalt compound. The flow distance of asphalt compound from the lower end at this time is measured, the flow distance per week is less than 1 mm, the flow distance per week is less than 1 mm and less than 5 mm, the flow distance per week is 5 mm or more Less than 200 mm was appropriate, and the flow distance per week was evaluated as 200 mm or more. In addition, out of the large ones, the flow distance per 24 hours was 200 mm or more. The results are shown in Table 2.
[0016]
[Table 1]
[0017]
[Table 2]
[0018]
As seen from Table 2, the asphalt compound of Example 1 has good workability, material separation does not occur, and the flow in the 10 ° C constant temperature bath is slightly small, but the flow in the 20 ° C constant temperature bath is appropriate, It can be applied as a water-stopping material in temperate areas (for example, Kyushu and Okinawa).
The asphalt compound of Example 2 has good workability, does not cause material separation, and is also suitable for flow in a 10 ° C. and 20 ° C. constant temperature bath, so that it has a moderate temperature range (for example, Tokai, Kanto region, etc.) It can be applied as a waterproofing material.
The asphalt compound of Example 3 has good workability, material separation does not occur, and the flow in the 20 ° C. constant temperature bath is slightly large, but the flow in the 10 ° C. constant temperature bath is also appropriate. It can be applied as a water-stopping material in Tohoku and beyond.
The asphalt compound of Comparative Example 1 is a material having an appropriate density but high penetration and low viscosity. Although the workability is good, since the viscosity is low, material separation occurs and the flow also increases, and it seems impossible to apply as an actual water stop material.
The asphalt compound of Comparative Example 2 is a material having a large density and a high viscosity. The workability was poor because of its high viscosity, and it was necessary to raise the construction temperature. Moreover, although material separation does not occur, it is judged that there is no flow and no self-filling property, and it seems that application as an actual water-stopping material is impossible.
[0019]
【The invention's effect】
In the present invention, since the water-stopping material is filled in the joint space of the steel sheet pile in advance, there is no need to remove the infiltration soil in the joint space as in the prior art, and the water-stopping material is not mixed with earth and sand. The quality of the waterstop material is ensured.
As water stopping material, density of 1.1 g / cm 3 or more by the addition of 40 wt% or less of the inorganic additive in the total amount, by using the asphalt compound, which is adjusted to less than 1.5 g / cm 3, long-term fluidity In addition, the seawater is eliminated due to the density difference, and the penetration of the asphalt compound at 25 ° C. is set to 60 or more and 150 or less, so that appropriate fluidity in the temperature range in which these water-stopping materials are used can be obtained. Can be expressed.
The absolute viscosity of the waterstop material at 100 ° C. is 8 Pa.s. s or more and 40 Pa. By setting it as s or less, the fluidity | liquidity at the time of the water-stopping material filling to the fitting joint of 100 degrees C or less can be ensured, and since it is filling work at 100 degrees C or less, the danger of an operation | work can be reduced.
The inorganic additive used in the asphalt compound as a water-stopping material can disperse the inorganic additive uniformly in the asphalt by making the passage amount of the 150 μm sieve 95% by mass or more in the particle size test. Appropriate fluidity can be obtained to self-fill the gaps and gaps inside the material.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of a steel sheet pile fitting joint of the present invention.
FIG. 2 is a view showing another embodiment of a fitting for a steel sheet pile according to the present invention.
FIGS. 3A, 3B and 3C are views showing another embodiment of the fitting joint of the steel sheet pile of the present invention. FIGS.
FIG. 4 is a view showing an asphalt compound flow test apparatus.
[Explanation of symbols]
1: Steel sheet pile 2: Male joint 3: Female joint 4: Slit 5: Water stop material 6: Male joint 7: Female joint 8: Slit 9: Steel half cylinder 10: Support steel plate 11: Acrylic half cylinder
Claims (2)
前記鋼製矢板の打設前に、継手空間に予め充填される止水材が、全量の４０重量％以下の無機物添加材によりその密度を１．１ｇ／ｃｍ３以上、１．５ｇ／ｃｍ３未満に調整されたアスファルトコンパウンドであり、当該アスファルトコンパウンドは、鋼製半円柱（９）に温度８５℃で流し込み、１０℃、２０℃の恒温槽中に垂直に立て、下端からアスファルトコンパウンドの流動を測定した場合に、１週間当たりの流動距離が５ｍｍ以上２００ｍｍ未満であって、
前記アスファルトコンパウンドの無機物添加材が、粒度試験において、１５０μｍ篩の通過量が９５質量％以上であることを特徴とする鋼製矢板継手部の止水材。A water-stopping material for a joint in which steel sheet piles such as steel sheet piles, steel pipe sheet piles, and H-type steel sheet piles are placed while fitting a pair of fitting joints together through a water-stop filler,
The striking設前of the steel sheet pile, water stopping material that is pre-filled in the joint space, the density of 1.1 g / cm 3 or more by 40 wt% or less of the inorganic additive in the total amount, 1.5 g / cm 3 The asphalt compound is adjusted to be less than or equal to, and the asphalt compound is poured into a steel semi-cylinder (9) at a temperature of 85 ° C., standing vertically in a constant temperature bath at 10 ° C. and 20 ° C., and the asphalt compound flows from the lower end. When measured, the flow distance per week is 5 mm or more and less than 200 mm,
A waterstop material for a steel sheet pile joint, wherein the inorganic additive of the asphalt compound has a passage of 150 μm or more in a particle size test of 95% by mass or more.
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| JP2003016518A JP4115288B2 (en) | 2003-01-24 | 2003-01-24 | Water stop material for steel sheet pile joints |
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| JP2003016518A JP4115288B2 (en) | 2003-01-24 | 2003-01-24 | Water stop material for steel sheet pile joints |
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| JP4115288B2 true JP4115288B2 (en) | 2008-07-09 |
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| JP6339848B2 (en) * | 2014-04-23 | 2018-06-06 | 前田道路株式会社 | Impermeable structure and method for forming impermeable structure |
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