To provide a water conducting hole of an underground wall and its construction method capable of efficiently forming a water conducting hole of a prescribed width.
When cutting an underground wall 1 by jetting slurry containing an abrasive material at a high pressure toward an outer wall surface 1a from a nozzle 15 arranged in an insertion hole 6 provided inside the underground wall 1, by performing the operation of rotating a direction of the nozzle 15 by a prescribed angle around a prescribed axis along the insertion hole 6 while jetting the slurry, stopping it and then turning a jetting direction from the nozzle 15 to a fixed state for prescribed time for a plurality of rotation positions, the underground wall 1 is cut. Thus, a shape inside a slit hole 7 formed from the insertion hole 6 to the outer wall surface 1a is roughly triangular or roughly sectorial whose vertex is the axial center in prescribed axial view along the insertion hole 6 and opposite side or arc is the outer wall surface 1a.
NIIZAKA TAKASHI
MORIWAKI MITSUHIRO
SANSHIN CORP
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