| 摘要 |
PROBLEM TO BE SOLVED: To construct a construction ground layer of firm support force in the ground by providing a foundation ground excavating device with an escape place of air filled in a hole during underground excavating work and a passage for underground water so as to solve the cause of hindrance in a work process such as the collapse of a previously tamped firm hole peripheral wall and the fall of excavated earth and gravel into the excavated hole due to the generation of strong sucking action and pneumatic action caused by vacuum in the cavity hole when pulling out the device. SOLUTION: Rod support plates 4, 4 supporting several tamping rods 5, 5, 5 in suitable shape at the peripheral parts with an auger shaft 1 as an axis and forming tamping rod support pieces 2, 2, 2 and air escape space parts 3, 3, 3 by chipping rod non-supporting places, at the upper and lower ends of the respective tamping rods 5, 5, 5. are integrally added to the upper and lower parts, and pressure guide earth plates are further disposed between the respective tamping rods 5, 5, 5.
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