Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
CUSHIONING MATERIAL FOR UNDERGROUND PIPE, AND BACKFILL METHOD FOR THE UNDERGROUND PIPE USING THE SAME
PROBLEM TO BE SOLVED: To provide means for preventing liquefaction of a ground or a cushioning material around an underground pipe at a time of earthquake, and effectively preventing damage to the underground pipe.SOLUTION: A cushioning material 4 for an underground pipe is disposed around an underground pipe 3 when the underground pipe 3 is buried, and includes sand and fine-grained soil of a particle diameter smaller than the sand for filling a gap between the sand particles. With the cushioning material 4 for an underground pipe, a mass ratio of the sand to a total mass of the sand and the fine-grained soil is between 70 and 80%. A sand particle diameter is between 0.075 and 2 mm, while a grain diameter of the fine-grained soil is 0.075 mm or less. The sand used is that with a density between 1.72 and 2.00 g/cmand a coefficient of subgrade reaction (K value) between 2,000 and 10,000 MN/m, when the water content ratio of the sand is in a range between 7.5 and 12.5%.SELECTED DRAWING: Figure 1
【課題】地震が発生したときに、埋設管の周囲の地盤ないしは埋設管用クッション材に液状化が生じるのを防止して、埋設管の損傷を有効に防止することを可能にする手段を提供する。【解決手段】埋設管３の埋設時に該埋設管３の周囲に配置される埋設管用クッション材４は、砂と、該砂より粒子径が小さく砂粒子間の間隙に位置する細粒土とを含んでいる。埋設管用クッション材４においては、砂及び細粒土の総質量に対する砂の質量の比率は７０〜８０％の範囲内である。砂の粒径は０．０７５〜２ｍｍの範囲内であり、細粒土の粒径は０．０７５ｍｍ以下である。砂としては、その含水比が７．５〜１２．５％の範囲内であるときに、密度が１．７２〜２．００ｇ／ｃｍ３であり、地盤反力係数（Ｋ値）が２０００〜１００００ＭＮ／ｍ３であるものが用いられる。【選択図】図１
CUSHIONING MATERIAL FOR UNDERGROUND PIPE, AND BACKFILL METHOD FOR THE UNDERGROUND PIPE USING THE SAME
PROBLEM TO BE SOLVED: To provide means for preventing liquefaction of a ground or a cushioning material around an underground pipe at a time of earthquake, and effectively preventing damage to the underground pipe.SOLUTION: A cushioning material 4 for an underground pipe is disposed around an underground pipe 3 when the underground pipe 3 is buried, and includes sand and fine-grained soil of a particle diameter smaller than the sand for filling a gap between the sand particles. With the cushioning material 4 for an underground pipe, a mass ratio of the sand to a total mass of the sand and the fine-grained soil is between 70 and 80%. A sand particle diameter is between 0.075 and 2 mm, while a grain diameter of the fine-grained soil is 0.075 mm or less. The sand used is that with a density between 1.72 and 2.00 g/cmand a coefficient of subgrade reaction (K value) between 2,000 and 10,000 MN/m, when the water content ratio of the sand is in a range between 7.5 and 12.5%.SELECTED DRAWING: Figure 1
【課題】地震が発生したときに、埋設管の周囲の地盤ないしは埋設管用クッション材に液状化が生じるのを防止して、埋設管の損傷を有効に防止することを可能にする手段を提供する。【解決手段】埋設管３の埋設時に該埋設管３の周囲に配置される埋設管用クッション材４は、砂と、該砂より粒子径が小さく砂粒子間の間隙に位置する細粒土とを含んでいる。埋設管用クッション材４においては、砂及び細粒土の総質量に対する砂の質量の比率は７０〜８０％の範囲内である。砂の粒径は０．０７５〜２ｍｍの範囲内であり、細粒土の粒径は０．０７５ｍｍ以下である。砂としては、その含水比が７．５〜１２．５％の範囲内であるときに、密度が１．７２〜２．００ｇ／ｃｍ３であり、地盤反力係数（Ｋ値）が２０００〜１００００ＭＮ／ｍ３であるものが用いられる。【選択図】図１
CUSHIONING MATERIAL FOR UNDERGROUND PIPE, AND BACKFILL METHOD FOR THE UNDERGROUND PIPE USING THE SAME
埋設管用クッション材及びこれを用いた埋設管の埋め戻し方法
YAMAZAKI MASANOBU (Autor:in) / TATEYAMA KAZUYOSHI (Autor:in) / YOKOYAMA TAKAAKI (Autor:in)
16.05.2016
Patent
Elektronische Ressource
Japanisch
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