EXCAVATOR AND METHOD FOR CONSTRUCTING UNDERGROUND COLUMN CONTINUOUS WALL USING THE SAME
PROBLEM TO BE SOLVED: To improve the construction efficiency by a method for constructing an underground column continuous wall. SOLUTION: An excavator is comprised of an excavating shaft 6 having an excavating member 6b, and when a hole d2 which overlaps a previously excavated hole c at its side po...
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Zusammenfassung: | PROBLEM TO BE SOLVED: To improve the construction efficiency by a method for constructing an underground column continuous wall. SOLUTION: An excavator is comprised of an excavating shaft 6 having an excavating member 6b, and when a hole d2 which overlaps a previously excavated hole c at its side portion, is subsequently excavated, an injection port 21 for outward injecting cutting fluid is formed at least in an underground inserted portion and within an excavation diameter of the excavating member 6b. When subsequent holes are drilled, a hole d1 which does not communicate with the preceding hole c is formed by main drilling by means of the excavating member 6b of the excavating shaft 6, and the hole d1 by the main drilling is further drilled by spraying the cutting fluid from the injection port 21, to thereby carry out additional drilling, i.e., enlargement of the hole d1 at least toward the preceding hole c, whereby an overlap portion R with the preceding hole c, for instance, is formed. |
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