... To improve loose sandy ground, methods such as applying vibration or impact to compact the sand to make it more stable, or injecting chemicals to improve the stability of the sand and its water-tightness, are generally used. Various methods have been devised and put into practical use to compact loose sandy ground so that it has a large stable bearing capacity even during earthquakes. The main methods include the compaction pile method, in which piles are driven into the ground to compact the sand, the vibration compaction method using a vibrating roller, the vibro tamper method, in which a plate with a vibrator attached is placed on the ground surface to compact the ground, the vibro rod method and the skewer compaction method, in which a rod-shaped or skewer-shaped vibrator is inserted into the sand to compact it, the vibro flotation method, in which a columnar body with a built-in vibrator is inserted into the sand while spraying water, and then the columnar body is removed while vibrating to compact the sand, and the dynamic consolidation method, in which a large weight is dropped from a high place using a crane to compact the sand. [Ueshita Kyokai]... *Some of the terminology used in relation to the "Kushigata Compaction Method" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 緩い砂地盤の改良に対しては,一般に振動または衝撃を加えて砂地盤を締め固めることによって安定した地盤に改善することと,薬液注入などを行って砂の安定性をよくするとともに遮水性をよくする薬液注入工法などが行われている。緩い砂地盤を地震時にも安定した支持力の大きい地盤とするために締め固める工法としていろいろの方法が考えられ,実用化されているが,おもなものとしては杭を打ち込んで砂地盤を締め固める締固め杭工法,振動力をもたせたローラーによる振動締固め工法,起振機を取り付けたプレートを地表に載せて締め固めるバイブロタンパー工法,棒状の振動体または串形(くしがた)の振動体を砂地盤に貫入させて締め固めるバイブロロッド工法および串形コンパクション工法,水を噴かせながら起振装置を内蔵した柱状体を砂地盤中に挿入した後,振動を加えながら柱状体を抜きつつ砂地盤を締め固めるバイブロフローテーション工法,クレーン車を利用して,大きなおもりを高いところから落下させて砂地盤を締め固める動圧密工法などが用いられている。【植下 協】。… ※「串形コンパクション工法」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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