A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
LIQUEFACTION COUNTERMEASURE METHOD
To provide a liquefaction countermeasure method which can effectively improve only the liquefaction layer in a bearing ground of a ground structure by using a freezing method.SOLUTION: A drilling rod is started from a ground, and a bent borehole 11 is drilled toward a liquefaction layer 5 in a bearing ground 1 of a banking 3. Then, the bent borehole 11 is further drilled so as to pass an inside of the liquefaction layer 5 in a substantially horizontal direction. Freezing pipes 13 are disposed in the bent borehole 11 in the liquefaction layer 5. A first temperature measuring pipe 19a is installed in a direction along the bent borehole 11 and a second temperature measuring pipe 19b is installed in a vertical direction so as to pass between a group of the freezing pipes 13. Then, a frozen beam is formed by circulating a freezing coolant in the freezing pipes 13 while measuring underground temperature by using the temperature measuring pipe 19. After completion of the frozen beam, operation of the freezing pipes 13 is controlled on the basis of temperature measurement result by the temperature measuring pipe 19, and the frozen beam is maintained.SELECTED DRAWING: Figure 2
【課題】凍結工法を用いて、地上構造物の支持地盤の液状化層のみを効率良く地盤改良することができる液状化対策方法を提供する。【解決手段】地上から削孔ロッドを発進させて、盛土３の支持地盤１の液状化層５に向けて曲がりボーリング孔１１を削孔した後、液状化層５内を略水平方向に通過するように、曲がりボーリング孔１１をさらに削孔する。そして、液状化層５内の曲がりボーリング孔１１に凍結管１３を配置する。また、凍結管１３の群の間を通るように、曲がりボーリング孔１１に沿った方向に第１の測温管１９ａを、鉛直方向に第２の測温管１９ｂを設置する。その後、測温管１９を用いて地中温度を計測しつつ、凍結管１３に凍結冷媒を循環させて凍結梁を形成する。凍結梁の完成後は、測温管１９による温度計測結果に基づいて凍結管１３の運転を制御して、凍結梁を維持する。【選択図】図２
LIQUEFACTION COUNTERMEASURE METHOD
To provide a liquefaction countermeasure method which can effectively improve only the liquefaction layer in a bearing ground of a ground structure by using a freezing method.SOLUTION: A drilling rod is started from a ground, and a bent borehole 11 is drilled toward a liquefaction layer 5 in a bearing ground 1 of a banking 3. Then, the bent borehole 11 is further drilled so as to pass an inside of the liquefaction layer 5 in a substantially horizontal direction. Freezing pipes 13 are disposed in the bent borehole 11 in the liquefaction layer 5. A first temperature measuring pipe 19a is installed in a direction along the bent borehole 11 and a second temperature measuring pipe 19b is installed in a vertical direction so as to pass between a group of the freezing pipes 13. Then, a frozen beam is formed by circulating a freezing coolant in the freezing pipes 13 while measuring underground temperature by using the temperature measuring pipe 19. After completion of the frozen beam, operation of the freezing pipes 13 is controlled on the basis of temperature measurement result by the temperature measuring pipe 19, and the frozen beam is maintained.SELECTED DRAWING: Figure 2
【課題】凍結工法を用いて、地上構造物の支持地盤の液状化層のみを効率良く地盤改良することができる液状化対策方法を提供する。【解決手段】地上から削孔ロッドを発進させて、盛土３の支持地盤１の液状化層５に向けて曲がりボーリング孔１１を削孔した後、液状化層５内を略水平方向に通過するように、曲がりボーリング孔１１をさらに削孔する。そして、液状化層５内の曲がりボーリング孔１１に凍結管１３を配置する。また、凍結管１３の群の間を通るように、曲がりボーリング孔１１に沿った方向に第１の測温管１９ａを、鉛直方向に第２の測温管１９ｂを設置する。その後、測温管１９を用いて地中温度を計測しつつ、凍結管１３に凍結冷媒を循環させて凍結梁を形成する。凍結梁の完成後は、測温管１９による温度計測結果に基づいて凍結管１３の運転を制御して、凍結梁を維持する。【選択図】図２
LIQUEFACTION COUNTERMEASURE METHOD
液状化対策方法
TSUJI RYOSUKE (author) / YOSHIDA TERU (author) / TERUI HIDEYUKI (author)
2019-07-11
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
LIQUEFACTION COUNTERMEASURE STRUCTURE AND LIQUEFACTION COUNTERMEASURE METHOD
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