| 摘要 |
FIELD: boring. ^ SUBSTANCE: instrument contains central tube, coaxial boring axis, at least, one oriented crosscut to boring axis edge, with several cutting teeth, and made as boring scoop transporting device for receive and/or transportation of gravel and sludge material, worked with cutting teeth. At the instrument boring head is fixed with, at least, two picks, located with advance of cutting teeth in boring direction, displaced from each other and distancing from each other forming central clear space. Picks are made arrow-shaped on lower ends with long outer edge and short inner one. For central soil column working horizontal edge is anticipated. Boring head is disconnectable fixed in tube receiving facility on lower end of central tube, which is made multiangular, especially quadrangle. ^ EFFECT: provision especially accurate piles construction. ^ 8 cl, 5 dwg |
