CONSTRUCTION METHOD FOR PRECEDING ELEMENT OF UNDERGROUND CONTINUOUS WALL, CONSTRUCTION METHOD FOR UNDERGROUND CONTINUOUS WALL, AND CONSTRUCTION DEVICE FOR PRECEDING ELEMENT OF UNDERGROUND CONTINUOUS WALL

PROBLEM TO BE SOLVED: To provide a construction method for a preceding element of an underground continuous wall, a construction method for the underground continuous wall, and a construction device for the preceding element that enable precision cutting by a cutting machine, without exposing a reinforcement cage inside.SOLUTION: A construction method includes the following steps for: erecting a reinforcement cage R in an installation hole H1 by fitting a plurality of first guide members 1 on an inner side of the reinforcement cage R, fitting a second guide member 2 at a bottom edge of the reinforcement cage R, placing a wire 3 having a hose 5 fitted on a rear side along an outside of a side surface RS1 and others of the reinforcement cage R from a top edge to the bottom edge, and pulling out a tip of the wire 3 from the top edge of the reinforcement cage R through the second guide member 2 and the plurality of the first guide members 1; placing the hose 5 on the outside of the side surface RS1 and others from the top edge to the bottom edge of the reinforcement cage while pulling up the wire 3 further, and filling a lean-mix grout material 7; and casting concrete 8 in the installation hole H1 and installing the preceding element 100 having a cutting area 100a.SELECTED DRAWING: Figure 4 【課題】内部の鉄筋籠が露出することなく、カッティングマシンによる精度のよい切削が可能である地中連続壁の先行エレメントの施工方法と地中連続壁の施工方法、および先行エレメントの施工装置を提供すること。【解決手段】鉄筋籠Ｒの内側に複数の第１の案内部材１を取り付け、鉄筋籠Ｒの下端に第２の案内部材２を取り付け、後方にホース５が取り付けられたワイヤ３を鉄筋籠Ｒの上端から下端に亘ってその側面ＲＳ１等の外側を沿わせ、第２の案内部材２を介し、複数の第１の案内部材１を介してワイヤ３の先端を鉄筋籠Ｒの上端から引き抜いた状態で鉄筋籠Ｒを造成孔Ｈ１に建て込むステップ、ワイヤ３をさらに引き上げながらホース５を側面ＲＳ１等の外側の上端から下端に亘って配設し、貧配合グラウト７を充填するステップ、造成孔Ｈ１にコンクリート８を打設し、カッティング領域１００ａを具備する先行エレメント１００を施工するステップからなる。【選択図】図４