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METHOD FOR CONSTRUCTING FROZEN WATER BARRIER
PROBLEM TO BE SOLVED: To provide a method for constructing a frozen water barrier in which a place having difficulty of closing of the frozen ground is predicted previously, and freezing promotion measures can be taken early and reliably.SOLUTION: Multiple freezing pipes 1 are installed on a freezing pipe arrangement line 5 of the ground 2, and multiple temperature measuring tubes 7 are installed in parallel to the freezing pipe arrangement line 5. Then, freezing pipes 1a of the place where installation intervals 3a are larger than normal installation intervals 3 are operated, and the preceding frozen ground 17 is formed in the place, and subsequently remaining freezing pipes 1 are operated to thereby form the frozen ground 19 in the whole. Now, the days when the earth temperature reaches a target value is predicted from the temperature drop tendency of a predetermined period of a time lapse curve of the temperature measured by using the temperature measuring tubes 7, and the remaining days to a freezing target date predicted from the present is estimated. Then, a non-closing place 21 to apply a supplementary construction method for freezing promotion according to the remaining days is determined, and the succeeding frozen ground 23 is formed by applying the supplementary construction method to the non-closing place 21 to thereby complete construction of the frozen water barrier 27.SELECTED DRAWING: Figure 1
【課題】凍土が閉合し難い箇所を事前に予測し、凍結促進対策を早期に確実に講じることができる凍土方式遮水壁の造成方法を提供する。【解決手段】地盤２の凍結管配置ライン５上に複数の凍結管１を、凍結管配置ライン５と並列に複数の測温管７を設置する。そして、通常の設置間隔３よりも設置間隔３ａが大きい箇所の凍結管１ａを稼働させて当該箇所に先行凍土１７を形成した後、残りの凍結管１を稼働させて全体に凍土１９を形成する。このとき、測温管７を用いて測定した温度の経時曲線の所定の期間の温度低下傾向から地中温度が目標値に達する日数を予測し、現在から予測した凍結完了日までの残日数を推定する。そして、残日数に応じて凍結促進のための補助工法を適用する未閉合箇所２１を決定し、未閉合箇所２１に補助工法を適用して後行凍土２３を形成し、凍土方式遮水壁２７の造成を完了する。【選択図】図１
METHOD FOR CONSTRUCTING FROZEN WATER BARRIER
PROBLEM TO BE SOLVED: To provide a method for constructing a frozen water barrier in which a place having difficulty of closing of the frozen ground is predicted previously, and freezing promotion measures can be taken early and reliably.SOLUTION: Multiple freezing pipes 1 are installed on a freezing pipe arrangement line 5 of the ground 2, and multiple temperature measuring tubes 7 are installed in parallel to the freezing pipe arrangement line 5. Then, freezing pipes 1a of the place where installation intervals 3a are larger than normal installation intervals 3 are operated, and the preceding frozen ground 17 is formed in the place, and subsequently remaining freezing pipes 1 are operated to thereby form the frozen ground 19 in the whole. Now, the days when the earth temperature reaches a target value is predicted from the temperature drop tendency of a predetermined period of a time lapse curve of the temperature measured by using the temperature measuring tubes 7, and the remaining days to a freezing target date predicted from the present is estimated. Then, a non-closing place 21 to apply a supplementary construction method for freezing promotion according to the remaining days is determined, and the succeeding frozen ground 23 is formed by applying the supplementary construction method to the non-closing place 21 to thereby complete construction of the frozen water barrier 27.SELECTED DRAWING: Figure 1
【課題】凍土が閉合し難い箇所を事前に予測し、凍結促進対策を早期に確実に講じることができる凍土方式遮水壁の造成方法を提供する。【解決手段】地盤２の凍結管配置ライン５上に複数の凍結管１を、凍結管配置ライン５と並列に複数の測温管７を設置する。そして、通常の設置間隔３よりも設置間隔３ａが大きい箇所の凍結管１ａを稼働させて当該箇所に先行凍土１７を形成した後、残りの凍結管１を稼働させて全体に凍土１９を形成する。このとき、測温管７を用いて測定した温度の経時曲線の所定の期間の温度低下傾向から地中温度が目標値に達する日数を予測し、現在から予測した凍結完了日までの残日数を推定する。そして、残日数に応じて凍結促進のための補助工法を適用する未閉合箇所２１を決定し、未閉合箇所２１に補助工法を適用して後行凍土２３を形成し、凍土方式遮水壁２７の造成を完了する。【選択図】図１
METHOD FOR CONSTRUCTING FROZEN WATER BARRIER
凍土方式遮水壁の造成方法
SHIBAZAKI HISAFUMI (author) / YOSHIDA TERU (author) / KIDA HIROMITSU (author) / TAKAMURA TAKASHI (author)
2017-07-27
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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