PURPOSE: To make efficient drilling possible up to deeper part by a method wherein crushing is made with a hydraulic crusher that is moved successively with a joint from a part under low restraint in a borehole.
CONSTITUTION: A hydraulic crusher 3 is inserted, starting from a part where restraint is low, into a borehole 9 drilled in the length longer than the length of the crusher 3 to a body to be crushed in bedrock or the like, and a part A for crushing is crushed by one time pressurization. The crusher 3 is then moved successively with a joint 7 from the part where the first crushing is made in the borehole 9 to parts under high restraint. Then, parts B and C for the second and the third crushing are crushed, and crushing for specified amount of drilling is finished with cracks produced entirely in an area for crushing. After that crushed bodies are removed with a breaker or the like.
| JP2022102768 | ELECTRIC STONE MATERIAL CRUSHING TOOL |
KADOTA SHUNICHI
NOMA TATSUYA
WATANABE TADASHI
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