No Dig Technologies
The No Dig technologies, or Trenchless Technologies, allow the installation, operation and maintenance of underground utilities networks, minimizing or completely eliminating open excavation.
The Horizontal Directional Drilling
Horizontal Directional Drilling is an innovative state-of-the-art technique adapted from the drilling technology used in the petrochemical industry, for the installation of underground utilities in places where conventional open-trenching solutions are inappropriate or not permitted, such as under rivers, railways, highways, in protected areas (national parks, urban areas of historical importance) or in densely populated residential areas.
- Minimization of the environmental impact
- Reduction of negative externalities for the community
- Pipe laying at the desired depths and in more protected positions
- Very small dimensions job sites
The drill head, fitted with the appropriate drill bit for the soil conditions, drags the drilling rods behind it into the bore, one after the other, creating the pilot bore. The mud, or drilling fluid, helps to stabilise the walls of the bore, to cool the drilling head, to reduce the amount of friction, and to transport the debris outside the bore. The ability to direct the head depends on the use of a specific electromagnetic transmitter in the drill head itself, which constantly transmits the position of the drill bit to the operator.
The position of the head can then be adjusted according to the desired trajectory of the bore path, and its direction altered creating a curving path: (h,12, h, 03, h. 06, h. 09).
Once the pilot bore has been completed the perforation is enlarged by reaming. Reamers of varying sizes are dragged back through the bore by the drilling rods until the desired diameter has been reached.
The conduct to be laid is fitted behind the last reamer in use and is pulled into position inside the bore as the reamer emerges.
Anese has always aimed at improving its market share in drilling activities. The company has already gained valuable experience in the sector by using its own geologists, who are responsible for subsurface mapping. In order to detect underground utilities on the site, Anese uses the GPR (Ground Penetrating Radar) technique, which is the most advanced non-destructive survey methodology for mapping and soil classification; the system allows the operator to obtain an accurate 3D map showing all the pipes, cables and obstacles in the ground.
It is among the most advanced systems at international level, and utilizes a multi-antenna configuration to help maximize the whole system resolution. The GPR system works by sending electromagnetic waves below ground. It then analyzes the reflected signal, which gathers data about the characteristics of the soil and of any objects. The survey is carried out by performing parallel and transverse scanning of the area to be mapped.