INSTALLATION METHOD FOR SOIL CEMENT COLUMN ROW WALL IN CIRCULAR VERTICAL SHAFT

To provide an installation method for soil cement column row walls for circular vertical shafts that can perform construction so that the lowering of the inserting properties of core materials and the reduction in the number of soil cement column row walls remaining when excavating the vertical shafts are unlikely to occur even when an earth retaining wall (sealing wall) is formed in the circular vertical shafts using a multi-axis pile driver.SOLUTION: When constructing an underground continuous wall of a column row pile type using a multi-axis pile driver, for the case in which the multi-axis pile driver is a five-axis machine, diameters of both end axes and a center axis that are normal-rotation axes are made larger than a reference excavation diameter, and for the case in which the multi-axis pile driver is a three-axis machine, the diameter of the center axis or both end axes are made larger than the reference excavation diameter. Because of this, it is possible to support a curved installation core for a circular vertical shaft.SELECTED DRAWING: Figure 1 【課題】円形立坑の山留め（遮水壁）を多軸式の杭打ち機にて造成する場合でも、芯材の挿入性の低下や立坑の掘削時に残っているソイルセメント柱列壁の減少が生じてしまうおそれがなく施工できる円形立坑のソイルセメント柱列壁の打設方法を提供する。【解決手段】多軸式の杭打ち機を使用する柱列杭形式の地中連続壁を施工する場合において、多軸式の杭打ち機が５軸機では正転軸である両端軸と中軸、３軸機では、中軸か両端のみを掘削径の基準となる径より大型化し、円型立坑の湾曲した打設芯に対応する。【選択図】図１