UNDERGROUND CONTINUOUS WALL WATER-STOP STRUCTURE AND METHOD

PROBLEM TO BE SOLVED: To provide an underground continuous wall capable of preventing water leakage from a joint portion or base lower end even in a large depth.SOLUTION: An underground continuous wall 1 constructed by forming a concrete in a groove drilled in the ground includes: a joint freezing duct 4 which is embedded in generally vertically up to the lower end along the concrete joint face; and a bottom freezing duct 5 which is embedded generally horizontally along concrete lower end plane being connected to the lower end of joint freezing duct 4. In particular, the bottom freezing duct 5 is installed generally horizontally along the bottom of the drilled groove; and the joint freezing duct 4 is installed generally vertically up to the lower end along the joint plane of the concrete in the drilled groove. After connecting the lower end of the joint freezing duct 4 to the end part of the bottom freezing duct 5, fill the drilled groove with concrete. After curing the concrete, a freezing liquid is supplied from the upper end of the joint freezing duct 4 to freeze the joint portion and the bottom of the underground continuous wall 1.SELECTED DRAWING: Figure 2 【課題】大深度であっても、構築後の打継部及び根入れ下端からの漏水の問題がない地中連続壁を提供する。【解決手段】地盤を掘削した掘削溝にコンクリートを打設して構築される地中連続壁１において、そのコンクリート打継面に沿って下端まで略垂直に埋設される打継面凍結管４と、その打継面凍結管４の下端に連続し、コンクリート下端面に沿って略水平に埋設される底面凍結管５と、を備える。具体的には、掘削溝の底面に沿って底面凍結管５を略水平に設置し、掘削溝のコンクリート打継面に沿って下端まで打継面凍結管４を略垂直に設置して、その打継面凍結管４の下端を底面凍結管５の端部に接続してから、掘削溝にコンクリートを打設して、そのコンクリートの硬化後、打継面凍結管４に上端から凍結液を供給して、地中連続壁１の打継部及び底部を凍結させて止水する。【選択図】図２