FIELD: building, particularly for reinforcing foundations and cast-in-place piles forming.
SUBSTANCE: device comprises percussion assembly including pneumatic drift and case surrounding thereof, as well as pipeline with pump. Case is rigidly secured to percussion assembly. Case comprises orifice made in front part thereof and adapted for receiving plug. Defined between the plug and the front part is cavity having cross-sectional area equal or more than that of pipeline located between percussion assembly and the case. Case has members for forming holes in ground located along longitudinal case axis and extending in radial direction thereof. The members have low rigidity and may be bent in radial direction. The members are provided with grooves formed in bending line thereof and rest brought into contact with case in extreme position.
EFFECT: increased efficiency.
7 cl, 7 dwg
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