EARTH RETAINING STRUCTURE AND CONSTRUCTION METHOD FOR THE SAME

PROBLEM TO BE SOLVED: To provide an earth retaining structure that can be simply and inexpensively constructed and that has high reliability, and a construction method for the earth retaining structure.SOLUTION: An earth retaining structure 1 includes an outer peripheral diaphragm wall 3 that surrounds a vertical pile 2, and an inner peripheral diaphragm wall 4 that is formed along an inner surface of the outer peripheral diaphragm wall 3. A lower end of the outer peripheral diaphragm wall 3 reaches an impervious layer Gc deeper than a leveling work surface 2a of the vertical shaft 2. A lower end of the inner peripheral diaphragm wall 4 is embedded to a position deeper than the leveling work surface 2a and shallower than the lower end of the outer peripheral diaphragm wall 3. 【課題】簡易かつ安価に構築することができ、なおかつ、信頼性の高い土留め構造および土留め構造の構築方法を提案する。【解決手段】立坑２を囲む外周連壁３と、外周連壁３の内面に沿って形成された内周連壁４とを備える土留め構造１であって、外周連壁３の下端は、立坑２の床付け面２ａ以深の遮水層Ｇｃに到達しており、内周連壁４の下端は、床付け面２ａよりも深く、かつ、外周連壁３の下端よりも浅い位置まで根入れされている。【選択図】図１