Tunnel Shift Engineer - QA QC

2. TBM Tunnel Construction Quality Control

• Quality Planning & Documentation
• Implement the Project Quality Plan, ITPs (Inspection & Test Plans), Method Statements, and Checklists specific to tunnel construction.
• Ensure all tunneling activities comply with project specifications, drawings, codes (IS, BS, ACI, EN), and client/consultant requirements.
• Maintain up-to-date revision control for all quality documents.
  
  

• Inspect and verify:
• TBM assembly & daily pre?launch checks
• Cutterhead tools, disc cutters, scrapers, brushes
• Main drive torque, pressure levels, and system parameters
• Slurry/EPB conditioning materials and their dosing
• TBM advance sequence, thrust forces, and ring build parameters
• Monitor segment installation, grout injection, and annular gap filling quality.
• Ensure correct segment type, orientation, gasket condition, and bolt torquing.
• Check for segment damage, joint opening, spalling, honeycombing, or misalignment.
• Precast Segment Quality Control
• Inspect segment delivery, handling, and storage at the tunnel portal/launching shaft.
• Check segment dimensions, surface finish, gasket alignment, lifting points, and embedded items.
• Verify segment traceability (batch number, production date, ring ID).
  

• Material Testing & Verification
• Conduct/monitor routine testing:
• Concrete slump & compressive strength
• Shotcrete rebound, thickness, core tests
• Grout pressure, density, viscosity
• Rock bolt pull-out tests
• Ensure all materials have valid MTCs, approvals, and compliance certificates.
• Verify excavation profiles using total station/laser scanning.
• Check TBM guidance system readings and ring alignment.
• Confirm tunnel geometry within tolerance (convergence, clearance, grade, alignment).
• Identify, report, and record any Non-Conformance Reports (NCRs).
• Coordinate with construction teams to implement corrective actions.
• Verify rectification works and close NCRs with proper documentation.
• Prepare:
• Daily QA/QC reports
• Checklists and inspection reports
• Test reports
• Tunnel segment installation records
• Grouting logs & as-built documentation
• Maintain systematic filing for audits and client verification.
• Ensure compliance with tunnel safety standards (confined space, ventilation, gas detection).
• Verify certification of lifting equipment used for precast segments.
• Support HSE team in incident investigation involving quality issues.
• Interface with:
• Client/consultant QA/QC teams
• TBM manufacturer representatives
• Survey, material testing lab, and construction teams
• Attend quality meetings and represent QA/QC department.