Microtunneling is a trenchless construction method used to install pipelines beneath highways, railroads, runways, harbors, rivers, and environmentally sensitive areas.
Microtunnels are installed using a remote-controlled drilling and pipe-jacking system. The drilling system provides continuous support to the excavation face by applying mechanical or fluid pressure to balance groundwater and earth pressures.
Support at the excavation face is a key feature of microtunneling, distinguishing it from traditional open-shield pipe-jacking and therefore is a preferred method when tunneling below the groundwater table and in caving soils.
Microtunnels vs Open Cut or Trenching
- Drill face support lowers risk of caving and settlement of roadways, buildings and adjacent utilities
- Can be performed in soil and rock
- Less excavation, so fewer spoils to remove
- Tunneling activity is independent of weather conditions
- Higher production rates
- Combined Sewer Overflow Systems
- Sea, lake or river outfall of sewer, water and industrial fluids
- Road crossings, streets, railways, buildings, airports, parks
- Desalinization plant water intake tunnels
- Gas, electricity, cable, and telecommunication networks conduits
Microtunneling at SDTT Altamira Landfall Executed
- Provide Design-Build Services for Shafts, Microtunnels and Ground Improvement
- Specialize in large diameter pipe jacking with long drives, resulting in fewer shafts
- Expert know-how with experience in more than 25 countries
- Hold World record tunnel lengths for outfall projects
- Currently fleet of 12 TBMs