safety audit to tunneling project - · pdf file•type of tbm ‐hard rock (single shield...
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SAFETY AUDITORS CONFERENCE 2011
Safety Audit to Tunneling Project
System Audit 11Method of Method of
excavation excavation –– TBM TBM or D&B or bothor D&B or both
22Tunnel ventilationTunnel ventilation 33
Conveyance & Conveyance & logistics supportlogistics support
44Communication Communication
systemsystem
55Power & fueling Power & fueling
systemsystem
66Access control & Access control & tracking systemtracking system
77Tunnel furniture & Tunnel furniture &
layoutlayout
88Flood control, fire Flood control, fire fighting & life fighting & life
supporting systemssupporting systems
TUNNEL PROJECTTUNNEL PROJECT
• Type of TBM ‐ Hard rock (single shield or double shield) or earth pressure balance (EPB), use of compressed air
Tunnel Boring MachineTunnel Boring Machine
• Ergonomics in the design of TBM, e.g. how cutter discs are replaced, design of the Pilot Room, the concern of manual handling in probing, grouting and installation of facilities
• Method statements for assembling, operation and dis‐assembling of the Tunnel Boring Machine
• Subsystems: Guidance system, dust suppression & collection system, gas monitoring system, fire detection and suppression system, segment erection, cranage, probing & grouting system, muck conveying system
11
Tunnel Boring MachineTunnel Boring Machine
11
Tunnel Boring MachineTunnel Boring Machine
11
Tunnel Boring MachineTunnel Boring Machine
11
• Type of Explosive – cartridge, emulsion or ANFO
Drill & BlastDrill & Blast
• Conveyance of Explosives – Mines vessel or vehicles, approved vehicles or train
• Method statements for blasting or concurrent blasting, especially the evacuation/ clearance procedure
• Handling of misfires and re‐entry procedure11
• Storage of Explosive – underground magazine, licensed DG stores
• Scaling procedure and rock mapping by geologist
Drill & BlastDrill & Blast
11
Drill & BlastDrill & Blast
11
Drill & BlastDrill & Blast
11
Drill & BlastDrill & Blast
11
• Design criteria for bored tunnel ventilation for fresh air supply and heat dissipation
Tunnel VentilationTunnel Ventilation
• Airflow measurements using anemometer
• Gas monitoring in data‐logging mode for a period of time after blasting (CO, CO2, CH4, H2S, O2, NOX, NH3)
• Gas monitoring during TBM dismantling22• BS 6164:2001 – Minimum 0.5 m/s
• Temperature measurement – Effective WBGT (heat stress assessment)
• Dust sampling (respirable dust)
• Radon monitoring (occupational health standard = 400 Bq/m3)
• Selection of suitable PPE
Tunnel VentilationTunnel Ventilation
22
• Conveyor belt/ rock crushing system – lockout/ tagout system, provision of guarding, installation of trip wire & emergency stops
Conveyance & Logistics SupportConveyance & Logistics Support
• Different train formations or the use of articulated vehicles
• Preventive maintenance program for the earthmoving equipment, rail and rolling stocks
33 • Long haul loaders and dumpers
• Operational safety procedures and safety devices, e.g. CCTV, sensors and warning lights
• Muck train and hoisting of muck receptacles
• Installation, operation and disassembly procedure of conveyor system/ rock crusher
Conveyance & Logistics Support
33
Communication System
44
• Contractual requirements and best practices – status of approval and implementation
• Integrated leaky cable network of mobile phone system, walkie‐talkies and FSD radio communication
• Intercom system within the TBM
• Fixed line telephone along tunnel and in TBM
• Genephone in the TBM refuge chamber and surface control centre
• Verified if the systems have been installed and whether they are working properly
Communication System
44
Power & Fueling System
55
• 110V – hand‐held equipment, lighting & small water pumps• 415V, 3 phase – Jumbo drills, conveyor booster motors, rock
crusher and other heavy duty equipment• 11kV ‐ TBM• Substations from power company at the surface and step‐
down transformers inside tunnel (to be protected from being hit by mobile plant)
• Application and provision of a licensed DG Store or the arrangement of daily fuel trucks; the safety of refueling operation inside tunnel
• Diesel fuel – tyre and track equipment, e.g. locomotives, dumpers, loaders, backhoes, lifting cranes, etc.
• Emergency backup – only sufficient for lighting, ventilation and flood control; emergency lighting (2 hr) operated by backup batteries
Access Control & Access Control & Tracking SystemTracking System
66
• Traditional tag board system with security guard acting as standby person
• Smart card system and access gates
• Real‐time tracking system
• Measure the success of implementation
Tunnel Furniture & Layout
77
• Segregated walkway between pedestrian and vehicular/ rail traffic – its implementation and maintenance
• Pedestrian walkway away from overhead conveyor
• The location of power supply lines, water mains/ return and compressed air piping to be identified – usually at a higher level to avoid easy accessibility and damages
• Indication and easy accessibility of emergency facilities, e.g. fixed lined telephones, fire alarms, Fire Services outlets, firehose reels, portable fire extinguishers, etc.
• Establishment and implementation of safety rules and procedures in connection with pedestrian and vehicular traffic
Flood Control, Fire Fighting & Life Supporting System
88
• Flood control measures and fire evacuation procedure
• Provision of fire detection system (e.g. smoke and heat detection system in TBM)
• Joint rescue exercises with emergency services
• Provision of refuge chambers and self‐rescuers
• Provision of fire suppression and extinguishing systems (e.g. CO2/ foam extinguishing system and water drenching system in TBM; mist suppression system in mobile plant engines
Flood Control, Fire Fighting & Life Supporting System
88
• TBM Pilots, Segment Erectors
Competency & Training
• Registered Shotfirers
• Licensed locomotive drivers, dumper operators, tower crane operators, mobile crane operators, gantry crane operators, backhoe operators, loader operators and forklift truck operators
• Registered electrical workers (LV & HV)
• Licensed jumbo drill operators, cherry picker operators, concrete pump operators
• Qualified geological and survey team
Thank You
Safety Audit to Tunneling Project