| Patent Number |
Title Of Patent |
Date Issued |
| 4504173 |
Apparatus for constructing cast in place tubular piles and method _of constructing such piles by |
March 12, 1985 |
| The apparatus includes two tools for forming holes in the subsoil without excavating it, which tools being coaxially mounted on a drill column. To the end of the drill column there is attached a hollow tool which is concealed when a skirt is in a lower position and exposed when the skirt |
| 4496011 |
Tool for forming earth holes having fixed walls and method therefor |
January 29, 1985 |
| A tool comprises two coaxial casings, a leading and a trailing ones, connected by a tubular element provided with ports for discharging a fixing material into a hole. The leading casing comprises a cylindrical portion, and frontal and rear conical tips provided with spiral tapered su |
| 4484640 |
Tool for formation of holes in macroporous compressible soils |
November 27, 1984 |
| A tool for the formation of holes without extracting the soil comprises a body having a cylindrical calibrating portion, coaxial portions with surfaces for the compaction of the soil and radii decreasing stepwise in the direction away from the calibrating portion, and terminating in an e |
| 4458765 |
Tool for forming a hole in macroporous compressible soil |
July 10, 1984 |
| A tool comprises a body having coaxial portions radially defined by soil compaction surfaces of step-down radii from the sizing portion to the tool tip. The soil-compaction surface of each portion is a cylindrical surface generated by a generatrix of a predetermined length extending para |
