| 摘要 |
PROBLEM TO BE SOLVED: To make the extra removing work of a concrete core unnecessary by a method wherein the concrete core developing through the boring with a core bit is discharged outside through the hollow part of the core bit and the hollow part of a drill shaft. SOLUTION: The core bit 14 of a boring machine is registered to a boring position on a concrete surface 20. After the settlement of the position of a trestle 1, the trestle 1 is bound with a temporary or regular anchor 31 to the concrete surface 20. Then, by fixing a waterstop through pressure bonding, an enclosedly structured coolant storage chamber 21 is completed. By utilizing the coolant storage chamber 21, a coolant is fed to the core bit 14 so as to start the boring of the concrete 20 with the core bit 14. A rotary shaft 4 and a drill shaft 15 are rotated by a driving motor 5. A driving part 3 and the core bit 14 are fed by patch by pitch by a level handle 25. The coolant in the coolant storage chamber 21 is sucked through a hose 24 and then discharged outside through a hollow part 16 or the like. Thus, the drawing work of a concrete core out of the core bit 14 is made unnecessary and the labor for a boring work can be reduced.
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