| 摘要 |
PROBLEM TO BE SOLVED: To pull out an earth auger from a ground by its own force in a pile jacking device pressing a pile while conducting pre-excavation by the earth auger with a easing. SOLUTION: The pile jacking device has a chuck 20 having a pile chuck section 22 and gripping a pile and a hydraulic cylinder lifting and lowering the chuck 20. A easing chuck 23 gripping the casing 16 of an earth auger and a hydraulic cylinder 24 elevating and bringing down the easing chuck 23 in the chuck 20 are installed to the chuck 20. The chuck 20 also has an auxiliary easing chuck 26 gripping the easing 16 apart from the easing chuck 23. The earth auger can be pulled out from a ground without using a crane by the easing chuck 23, the hydraulic cylinder 24 and the auxiliary easing chuck 26.
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