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A platform for research: civil engineering, architecture and urbanism
CUSHIONING MATERIAL FOR UNDERGROUND PIPE AND BACKFILL METHOD FOR UNDERGROUND PIPE
PROBLEM TO BE SOLVED: To provide means capable of preventing liquefaction phenomenon from occurring in the ground around an underground pipe or a cushioning material for an underground pipe and capable of effectively preventing the underground pipe from being damaged at the time of occurrence of earthquake.SOLUTION: A cushioning material 4 arranged around an underground pipe 3 when the underground pipe 3 is buried includes sands, fine grain soil (clay) having smaller particle diameter than that of the sands and positioned in clearances among the sand particles. The cushioning material 4 for the underground pipe shows that a rate of mass of the sands against a total mass of sands and fine particles is a range of about 70 to 80%. A particle diameter of sand is in a range of about 0.075 to 2 mm and fine grain soil is clay having its particle diameter range of 0.001 to 0.005 mm. As sand, sand with its density being 1.72 to 2.00 g/cmwhen its moisture content is in a range of 7.5% to 12.5% and a ground reaction coefficient (K value) being 2000 to 10000 MN/mis used.
【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（粘土）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、細粒土は、粒径が０．００１〜０．００５ｍｍの範囲内の粘土である。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 UNDERGROUND PIPE
PROBLEM TO BE SOLVED: To provide means capable of preventing liquefaction phenomenon from occurring in the ground around an underground pipe or a cushioning material for an underground pipe and capable of effectively preventing the underground pipe from being damaged at the time of occurrence of earthquake.SOLUTION: A cushioning material 4 arranged around an underground pipe 3 when the underground pipe 3 is buried includes sands, fine grain soil (clay) having smaller particle diameter than that of the sands and positioned in clearances among the sand particles. The cushioning material 4 for the underground pipe shows that a rate of mass of the sands against a total mass of sands and fine particles is a range of about 70 to 80%. A particle diameter of sand is in a range of about 0.075 to 2 mm and fine grain soil is clay having its particle diameter range of 0.001 to 0.005 mm. As sand, sand with its density being 1.72 to 2.00 g/cmwhen its moisture content is in a range of 7.5% to 12.5% and a ground reaction coefficient (K value) being 2000 to 10000 MN/mis used.
【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（粘土）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、細粒土は、粒径が０．００１〜０．００５ｍｍの範囲内の粘土である。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 UNDERGROUND PIPE
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 (author) / TATEYAMA KAZUYOSHI (author) / YOKOYAMA TAKAAKI (author)
2015-07-27
Patent
Electronic Resource
Japanese
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