Tunnels
Underground
Sub’roca provides ventilation systems equipped with ducting for tunnels under excavation, up to JetFans (airflow accelerators) for through tunnels.
JetFans and Longitudinal Ventilation
Due to the geometry of tunnels and interconnected networks, it can be difficult, or even impossible, to direct airflow to specific areas. It may be possible to control and improve the airflow path using JetFans, also known as air accelerators.SUB’ROCA has leveraged its expertise gained from Charbonnages de France to design JetFans mounted on fixed or mobile frames, which can be easily repositioned to adapt the airflow path.
Safety is a key consideration in the design and manufacture of our systems. SUB’ROCA provides longitudinal ventilation systems designed to induce an airflow rate for ventilating road, railway, and other types of tunnels.
Our engineering department is able to size the systems according to your specific requirements and constraints.
Different Configurations, Different Requirements
We are able to design fans ranging from single-stage (1 stage) to multi-stage (up to 4 stages) configurations, adapted to the constraints and phasing of your project, based on the following characteristics:
Spiral Ducts
Flexible spiral ducts, commonly known as “Spiraducts”, are ducts designed to circulate a fluid, in this case air, which may contain pollutants, dust, or gases. They can be used for both air supply and extraction (under positive or negative pressure) and can be connected using various systems (belts, straps, zippers, etc.).
They are manufactured as standard from 550 g/m² PVC, but can be produced with PVC ranging from 300 to 1,000 g/m² upon request. They are supplied in sections of 5, 10, 15, or 20 metres.
Smooth Flexible Ducts
Smooth flexible ducts, commonly known as “Ventubes”, are ducts designed to circulate a fluid, in this case air, which may contain pollutants, dust, or gases. They are used for air supply and can be connected using various systems (belts, straps, zippers, etc.).
They are manufactured as standard from 550 g/m² PVC, but can be produced with PVC ranging from 300 to 1,000 g/m² upon request. They are supplied in sections of 5, 10, 15, or 20 metres.
They can also be manufactured in lengths of several tens or even hundreds of metres when using a duct cassette, particularly for tunnelling operations involving tunnel boring machines (TBMs).
Industries We Serve
Areas of Expertise
Sub’Roca works on all underground projects requiring expertise in safety and mining engineering. Our areas of expertise include underground mines and quarries (miner protection, network ventilation), public works and underground infrastructure (metro stations, shafts, railway tunnels), civil engineering tunnels (Grand Paris Express, railway connections, major international projects), and microtunneling and underground networks (electrical, water, and wastewater networks).
Underground Mines & Quarries
Tunnels
Public Works & Infrastructure
Microtunneling & Underground Networks
Duct Connection Types
Belt Connection
Zipper Connection
Strap Connection
Velcro Connection
Protect
Your Teams
Contact us to request your quote.