Device for anchoring in multilayer soil

Abstract

It is provided that an anchoring device, in which a positioning plate, intended for bearing on the surface of the soil, is mounted on a hollow rod, the rod supporting in series, from the positioning plate towards the free end, at least one helical disc followed by a drilling disc, wherein the rod extends beyond the drilling disc opposite the plate, and a bit is arranged on the free end of said rod, such that a first portion of the rod, suitable for being screwed into at least one first soil layer, extends from the plate to the drilling disc, and such that a second portion of the rod, suitable for anchoring in a second soil layer, extends from the drilling disc to the bit.

1 . A device for anchoring in multilayer soil comprising:
 a hollow rod comprising:
 a first end which receives a fastener, and 
 a free opposite end which is configured to drill into a ground, 
   a positioning plate which is mounted on the hollow rod and is configured to bear on a surface of the soil,   wherein the rod successively supports, from the positioning plate towards the free end, at least one helical disc then a drilling disc, and   wherein the rod extends beyond the drilling disc opposite the positioning plate, and a bit is arranged on the free end of said rod, such that a first portion of the rod, suitable for being screwed into at least one first soil layer, extends from the positioning plate to the drilling disc, and such that a second portion of the rod, suitable for anchoring in a second soil layer, extends from the drilling disc to the bit.   
     
     
         2 . The anchoring device according to  claim 1 , wherein the bit has a diameter larger than a diameter of the second portion of the rod. 
     
     
         3 . The anchoring device according to  claim 1 , wherein the at least one helical disc and the drilling disc are welded on the rod. 
     
     
         4 . The anchoring device according to  claim 1 , wherein a cylindrical casing is formed around the first portion of the rod, between the positioning plate and the helical disc closest to the plate. 
     
     
         5 . The anchoring device according to  claim 1 , wherein a cylindrical casing is formed around the first portion of the rod, between the positioning plate and the drilling disc. 
     
     
         6 . The anchoring device according to  claim 5 , wherein the cylindrical casing has a variable diameter whereof the smallest diameter is larger than a diameter of the second portion of the rod. 
     
     
         7 . The anchoring device according to  claim 6 , wherein the cylindrical casing has a first section extending from the positioning plate and having a first diameter followed by a second section extending to the drilling disc and having a second diameter smaller than the first diameter and larger than the diameter of the second portion of the rod. 
     
     
         8 . The anchoring device according to  claim 5 , wherein the hollow rod is threaded over at least the second portion extending between the drilling disc and the bit, and in that this hollow rod is smooth in the first portion surrounded by the cylindrical casing. 
     
     
         9 . The anchoring device according to  claim 1 , wherein at least part of the rod and the bit are pierced with holes for injecting a cement or a synthetic resin for anchoring in compact rocky-type soils. 
     
     
         10 . The anchoring device according to  claim 9 , wherein the holes for injecting cement are pierced only on the second portion of the rod and on the bit. 
     
     
         11 . The anchoring device according to  claim 9 , wherein the holes for injecting cement or resin are pierced over the first portion and the second portion of the rod and on the bit.