Tunnel Shift Engineer - QA/QC

Larsen & Toubro

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.

(Applicable for shield/EPB/TBM tunneling projects)

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).

(If you want, I can also share detailed segment?specific QC checklists.) 5. Tunnel Survey & Alignment Quality 6. Non-Conformance & Corrective Actions (NCR/CAR) 7. Documentation & Reporting 8. Safety & Compliance 9. Coordination & Communication

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.