| 摘要 |
PROBLEM TO BE SOLVED: To provide an excavation method which enables the accumulation of a mud cake and slime to be reduced without a decrease in excavation efficiency, in a normal circulation method. SOLUTION: Excavation equipment 10 comprises a boring machine 12 and a grout pump 16. Slurry, which is supplied from the grout pump 16, is introduced into the rod pipe 22 of the boring machine 12. A cutter head 24 is provided at the lower end of the rod pipe 22, and an excavation hole H is excavated. The slurry introduced into the rod pipe 22 is supplied into the excavated hole H from a lower end opening of the rod pipe 22. The grout pump 16 supplies the slurry to the boring machine 12. The quantity of the slurry supplied by the grout pump 16 is 0.5-2.1 m<SP>3</SP>/min, that is, 1.5-5 times as large as the quantity of the slurry supplied in a conventional normal circulation method. Thus, the accumulation of the mud cake and the slime can be reduced without the decrease of the excavation efficiency in the normal circulation method. COPYRIGHT: (C)2007,JPO&INPIT
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