Underpinning

Japanese: アンダーピニング(英語表記)under pinning
Underpinning
This refers to foundation reinforcement work to prevent nearby existing structures from sinking or tilting when carrying out underground construction. It also includes work to restore buildings that have already sunk or tilted, or to move buildings. Methods include installing retaining walls, adopting ground stabilization methods, and installing additional support piles to prevent soil and water from moving under the foundation of the structure. Underpinning must be carried out without destroying or damaging existing structures and the surrounding area, and since it is dangerous and difficult work with limited working space, it takes longer to complete and costs more than general foundation work, and requires a high level of comprehensive knowledge and experience.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
地下工事を行う際に近接する既存の構造物が沈下や傾斜を起さないよう予防する基礎補強工事をいう。すでに沈下したり傾斜したりした建物を復元する場合や建物を移動させる場合の工事も含む。方法としては構造物の基礎下の土や水を動かさないようにするため,山止め壁の設置,地盤安定工法の採用,別の支持杭を設ける,などがある。アンダーピニングは既設構造物および周囲に破壊や損害を与えないように施工しなければならず,作業空間が制限され危険かつ困難な作業であるため,一般の基礎工事と比べて工期,工費ともに多大となり,高度の総合的知識および経験が必要とされる。

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