METHOD FOR FORMING UNDERGROUND CONTINUOUS WALL

PROBLEM TO BE SOLVED: To provide a method for forming an underground continuous wall capable of surely preventing eccentricity of H-shaped steels when placing a cement-based fluid by a simple constitution and also capable of surely preventing deterioration in strength of the underground continuous wall.SOLUTION: In a method for forming an underground continuous wall, a cement-based fluid S is placed after a plurality of H-shaped steels 1 are erected in a drilled groove D filled with a drilling mud. At least partial H-shaped steels 1B of the plurality of H-shaped steels 1 have circulating holes 5 for the cement-based fluid S penetratingly formed only in lower end side portions of webs 1b. The method for forming an underground continuous wall includes: an erection step of connecting flanges 1a of the plurality of H-shaped steels 1 to each other by connection members 4 only on an upper side above the lower end side portions where the circulating holes 5 are penetratingly formed, in a parallel state in which predetermined clearances are formed between adjacent ones of the plurality of H-shaped steels 1 and the webs faces face each other, and thereafter erecting the plurality of H-shaped steels 1 connected to each other in the drilled groove D; and a placing step of inserting tremie pipes 10 between adjacent ones of the plurality of H-shaped steels 1 after execution of the erection step and placing the cement-based fluid S.