FIELD: building machinery, particularly for forming cast-in-place piles, pile foundations, retaining walls, slope protection structures and ground bases for floors.
SUBSTANCE: device comprises percussion unit with working forming unit made as sharpened cylinder and integrated in front part of percussion unit. Sharpened cylinder has outline including alternating convex and concave parts. Operational forming unit comprises two members with conical surfaces on front outer side thereof and spaced one from another along longitudinal device axis. Operational forming unit has seat surfaces located on outer rear part surface of front member and on inner surface of rear member.
EFFECT: increased efficiency of well driving.
3 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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RU2256027C2 |
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|
RU2153044C2 |
