FIELD: underground pipeline building and usage.
SUBSTANCE: device comprises body and hammer with through longitudinal channel arranged in the body so that the hammer divides body interior into front ant rear chambers. Device also has air-distribution nipple, hollow pipe installed in through orifices of body and hammer, as well as air-sully pipeline and discharge channel. The pipe is permanently communicated with atmosphere and is periodically connected with front chamber by means of radial channel. Rear chamber is permanently communicated with pipeline.
EFFECT: extended range of technical means.
4 cl, 2 dwg
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