PURPOSE: To prevent the water slurry from being diluted by water by filling the water slurry in a bag in a method wherein the water sluury of expansive material is injected in a hole made in a brittle matter and the matter is destructed by the expansion pressure.
CONSTITUTION: A hole is made in a brittle matter e.g. a rock in the water. In this hole is inserted a hose in the tip of which is put a slender bag slightly smaller in diameter than the hole and having proper elasticity and nonpermeability and the bottom, and then, while the hose being drawn out, the water slurry of expansive material is injected in the slender bag. After the injection is completed, the hose is removed from the bag and the inlet port of the bag is shut tightly so as for the bag to be watetight. Thereby the water slurry of the expansive material is saved from the dilution by water in the hole and, moreover, the expansion pressure is transmitted effectively to the peripheral wall of the hole.
ISHII SHIROU
TANAKA KENICHI
CHIYUUGOKU BAKUSAI KOUJI KK