Remedial civil works: micropile underpinning and laboratory refurbishment at kusile power station wtp

Submit all project documents to the delegated Project Manager via formal Transmittals. Electronic submissions must use the Eskom Document Control email ([email protected]) and the Zendto file transfer service. Files over 2MB must be uploaded to the Zendto portal. Hard copies are required only for IOM Manuals and final as-built submittals. Every submittal must include a transmittal note with the following metadata: Contract/Package number, document title, revision, date, and recipient details.

Evaluation includes a Contractor-provided report on the integrity of cast micropiles, validated by the Project Manager. Load tests may be conducted at the Contractor's discretion and must be accepted by the Project Manager. Quality control requirements: daily monitoring of grout cube compressive strength (min 30 MPa) and grout density. Grout test results must be submitted to the Project Manager within 24 hours. Non-compliance with grout specifications or testing may result in disqualification.

Scope: Remedial underpinning of the WTP Laboratory foundation slab (350mm thick) to arrest settlement. Key deliverables: 1. Relocate and store all laboratory furniture, equipment, and utility pipelines (e.g., drying ovens, cupboards, fume hoods, anti-vibrational tables, C&I equipment, CBMS infrastructure). 2. Demolish selected infill brick walls, doors, door frames, and ceiling boards as per drawings 366/231264 Rev 02. 3. Install self-drilling, continuous-thread hollow-core steel bar micropiles (R25N) to ~15m depth with a 2.5m rock socket, spaced <3m c/c, avoiding existing reinforcing. 4. Pressure grout micropiles using stable neat cement or sand-cement grout (min 30 MPa compressive strength). 5. Reinstate all demolished walls, doors, ceiling boards, and reinstate furniture/equipment post-remediation. 6. Apply monolithic floor coating in laboratory areas. 7. Conduct survey monitoring of foundation levels (accuracy ±1mm) before, during, and after construction. 8. Follow sequence: core holes → symmetric micropile installation (sides to center) → reinstatement. Equipment: Coring rigs (125mm diameter), drilling rigs (max 18m depth), grout batchers/mixers, pumps (up to 6MPa), and calibrated pressure gauges. Tolerances: Micropiles plumb within 2% of length; top elevation ±15mm. Abandoned piles must be replaced within 300mm offset, approved by Project Manager.

Mandatory compliance: South African Occupational Health and Safety Act, Construction Regulations 2014, Eskom SHEQ Policy 32-727, and waste management code of practice. Quality standards: ISO 9001 (Quality Management Systems) and SANS 2001-CC1 (concrete works). Documentation: Submit a project-specific safety file and a detailed Quality Control Plan (QCP). Additional standards: Eskom-specific standards (e.g., 240-53114026, 240-53113685) and SANS 50197-1 for cement. All works must align with Eskom’s engineering and document management procedures (e.g., 240-76992014, 240-124499452).