FIELD: construction.
SUBSTANCE: invention relates to mechanisms and equipment used in construction of load-bearing foundation piles for soil drilling. A drilling unit includes a cluster bit of submerged-type impact hammers, which consists of two or more submerged-type impact hammers, each of which is equipped with a drilling head; a distributor for distribution of compressed air or liquid under pressure from two or more independent sources for supply to the cluster bit of submerged-type impact hammers and a swinging head to provide an angular rotation speed and torque for the unit. The distributor is connected to the cluster bit of submerged-type impact hammers. The swinging head is connected to the distributor, in which at least two impact hammers are equipped with compressed air or liquid under pressure from two independent supply sources.
EFFECT: drilling of mixed soil consisting of materials of different hardness.
7 cl, 4 dwg
