The day of a Micro Tunnelling Operator begins early, often before sunrise. Arriving at the job site, the first task is to attend a safety briefing with the crew. Safety is paramount in tunnelling, so reviewing potential risks and ensuring compliance with all regulations is crucial.
After the briefing, the operator conducts a thorough inspection of the Micro Tunnel Boring Machine (MTBM). This includes:
- Checking hydraulic systems, slurry pumps, and cutter head components.
- Ensuring all navigation and guidance systems are calibrated and functioning.
- Verifying communication systems with the control room and tunnel crew.
Mid-Morning: machine startup and tunnelling operations
Once all safety and operational checks are complete, it’s time to get the MTBM running. The operator takes their position in the control cabin, monitoring various parameters as the machine begins boring through the ground.
A significant part of the role involves precise control of the MTBM, ensuring it follows the designated tunnel path. The operator uses advanced guidance systems such as laser targeting and gyroscopic navigation to make adjustments in real time. Meanwhile, they continuously monitor factors such as:
- The speed and torque of the cutter head.
- Soil and groundwater conditions affecting the excavation process.
- Slurry pressure and flow to prevent tunnel collapse or over-excavation.
Afternoon: problem solving and maintenance
As tunnelling progresses, challenges inevitably arise. The operator must be quick to troubleshoot and adapt to unexpected conditions, such as encountering harder-than-expected soil or adjusting the slurry balance to deal with high groundwater levels.
During lunch breaks, the operator stays in touch with engineers and site managers to review progress and discuss any concerns. A quick walk through the site may be necessary to check on pipe jacking operations, ensuring seamless tunnel construction.
Later in the afternoon, routine maintenance may be required. The operator works with mechanics to inspect the cutter head and other critical components. Small adjustments can significantly impact performance and efficiency, so regular inspections are vital.
Evening: wrapping up and reviewing the day
As the shift comes to an end, the operator compiles a daily progress report, noting:
- The distance tunneled and any deviations from the planned alignment.
- Issues encountered and solutions implemented.
- Equipment performance and any required maintenance for the next shift.
Before leaving, a final team debrief is held to discuss the day’s work and plan for the next phase. The operator ensures the MTBM is properly shut down and secured, knowing that tomorrow will bring new challenges and opportunities.
Being a Micro Tunnelling Operator is a demanding but rewarding career. It requires technical expertise, problem-solving skills, and a commitment to safety. Each day presents unique challenges, from operating advanced machinery to navigating underground conditions. As cities continue to expand their underground infrastructure, the role of a Micro Tunnelling Operator remains essential, shaping the future of urban development one tunnel at a time.