This study guide is designed to assist individuals preparing for the UK CSCS (Construction Skills Certification Scheme) Tunnelling Operations – Category 22 exam and complimentary to our Tunnelling Operations mock exam questions. The guide covers essential topics related to safety, health hazards, operational procedures, and best practices in tunnelling work environments.
The content is derived from a comprehensive question bank addressing various aspects of tunnelling operations, including the use of specialised equipment, emergency protocols, hazard recognition, and risk mitigation strategies. The guide aims to provide a structured overview of the key concepts and knowledge required to ensure a secure and efficient tunnelling worksite.
By thoroughly reviewing the information presented in this study guide, candidates can enhance their understanding of tunnelling safety regulations, familiarize themselves with industry-standard practices, and develop the necessary skills to identify and mitigate potential risks effectively.
Successful completion of the CSCS Tunnelling exam demonstrates an individual’s competence and commitment to maintaining a safe working environment in tunnelling projects.
Safety Equipment and Access
- Your self-rescue set should be immediately accessible when working underground.
- Rescue services refer to the information on a tally board during emergencies.
- Atmosphere is considered oxygen deficient below 19% oxygen level.
- Calibrated gas detectors are used to detect odourless gases like carbon monoxide and methane. Methane is explosive and reduces oxygen levels.
- Hydrogen sulphide gas can cause respiratory paralysis. Malfunctioning ventilation system will trigger an audible alarm.
- Communication equipment should have an independent power supply from the main tunnel supply.
- Use two-way radios and tannoy systems to communicate between tunnelling face and surface.
- Emergency lighting in tunnels should be placed maximum 50m apart.
- 400V plugs are coloured red to indicate high voltage.
- No smoking/naked flames within 10m of battery charging areas due to explosive gases.
- No hot work within 10m of diesel fuelling points.
- Maintain 60 minute fire watch after completing hot works.
Health Hazards
- Nitrogen oxides are mainly from diesel equipment.
- Cement burns, HAVS, and dust are hazards from sprayed concrete.
- Hand tools cause HAVS and noise but not whole body vibration in hand mining.
- Hydrogen sulphide smells like rotten eggs.
- HAVS causes permanent damage, gloves can help prevent it.
- Eyewash stations needed for cement/concrete splashes at batching plants.
Tunnel Operations
- Use hop-ups/refuges when vehicles are passing through tunnels.
- Conveyor systems need emergency stop cords/buttons.
- Move to refuges immediately if locomotives/vehicles approach.
- Use signals/CCTV to control locomotive movements near tunnel boring machines (TBMs).
- Anti-rollback devices prevent conveyor overloading/power loss.
- Common traffic light system: Red=Stop, Amber=In Bye, Green=Out Bye.
- Least efficient way to manage pit bottom locomotive movements is verbal communication.
- Provide safe refuges every 50m on straights, 25m on curves.
- Use alternative control point to address TBM operator’s restricted vision.
Grouting and Transport
- Release pressure first if grouting pipe is obstructed.
- Clean grouting pipes after use to prevent blockages/bursting.
- Use crash cages/side bars on personnel carriers to prevent falls/injuries.
- Maintain two escape routes from working shafts during tunnelling.
- Use tally system to control tunnel access/exit.
- Only transport the number of people specified for personnel cage’s capacity.
- Use safety harnesses when constructing rings on elevated shaft platforms.
- Keep oxygen cylinders away from grease to avoid fire hazards.
- Report any tears in ventilation ducting to a supervisor.
- Grout gun in segment holes risks blowout at injection point.
- Back support not needed for robotic sprayed concrete lining operations.
Tunnelling operations involve a unique set of challenges and hazards that require comprehensive knowledge and adherence to stringent safety protocols. This study guide has provided an overview of the critical areas covered in the UK CSCS Tunnelling exam, equipping you with the essential information to ensure a safe and efficient tunnelling work environment.
Remember, safety should always be the top priority in any tunnelling project. By thoroughly understanding the concepts outlined in this guide, including proper use of safety equipment, hazard recognition, emergency procedures, and operational best practices, you can contribute to maintaining a secure workplace and protecting yourself and your colleagues.
Continuous learning and staying updated with the latest industry standards and regulations is crucial in the dynamic field of tunnelling. Regularly reviewing and applying the knowledge gained from this study guide will not only prepare you for the CSCS Tunnelling exam but also lay the foundation for a successful and responsible career in this specialised domain.