DOUBLE EARTH RETAINING WALL

To provide a double earth retaining wall optimum as an earth retaining wall for surrounding and closing an excavation planned area in the excavation work of a shaft and the like, and dispensing with or reducing timbering.SOLUTION: A first wall body 11 is driven into the ground to partition an excavation side and a natural ground side. A second wall body 12 is driven into the ground in the natural ground side from the first wall body 11 with an interval in relation to the first wall body 11. First head part connection materials 13 are provided in an extended direction of the first and second wall bodies 11, 12 with predetermined intervals, and the heads of the first and second wall bodies 11, 12 are connected with each other in an X-shape in a perpendicular plane. Second head connection materials 14 are provided between the adjacent first head part connection materials 13, 13, respectively, and the heads of the first and second wall bodies 11, 12 are connected with each other in the X-shape in a horizontal plane.SELECTED DRAWING: Figure 2 【課題】 立坑などの開削工事に際し、開削予定領域を囲んで閉じる土留め壁として最適な二重土留め壁を提供し、支保工を不要ないし軽減する。【解決手段】 第１の壁体１１は、地盤に開削側と地山側とを仕切るように打ち込まれる。第２の壁体１２は、第１の壁体１１より地山側の地盤に、第１の壁体１１に対し間隔をあけて打ち込まれる。第１の頭部連結材１３は、第１及び第２の壁体１１、１２の延在方向に所定の間隔で設けられ、第１及び第２の壁体１１、１２の頭部どうしを垂直面内でＸ字状に連結する。第２の頭部連結材１４は、隣り合う第１の頭部連結材１３、１３の間にそれぞれ設けられ、第１及び第２の壁体１１、１２の頭部どうしを水平面内でＸ字状に連結する。【選択図】 図２