2025-03-31    90

1. Pre-construction Preparations

• Enhanced Drawing Review:
  Conduct thorough review of construction drawings before project commencement. The project control team shall:
  • Study design documents, relevant codes, and technical specifications
  • Clarify design intent through interdisciplinary coordination

• Construction Plan Audits:
  Rigorously examine the steel structure installation plan – the critical technical guidance document affecting quality and progress. Focus areas include:
  • Construction methodology validity
  • Resource allocation rationality
  • Quality assurance measures

2. In-process Quality Control
2.1 Foundation Works
For concrete independent column foundations:

Implementation measures:
• Implement triple verification (template positioning → rebar cage fixing → concrete pouring)
• Use laser alignment for bolt group positioning

2.2 Main Structure Installation
Component Installation:

• Column Installation Checklist:
  ✓ Base plate shim tightness (No rocking)
  ✓ Verticality (≤H/1000, max 25mm)
  ✓ Alignment deviation (≤5mm)

• Beam Installation Requirements:
  • Straightness tolerance: ≤L/1500 (L=span)
  • Web verticality: ≤h/250 (h=section height)
  • Faying surface cleanliness: Sa2.5 blast level

Post-installation Procedures:
Complete secondary grouting with expansive concrete within 24 hours after structural unit finalization.

2.3 Bolt Connection Management

Comparison of Bolt Types:

Key controls for high-strength bolts:
• Certificates verification (manufacturing + site testing)
• Installation sequence: Center→Outward symmetrical tightening
• Final torque tolerance: ±3% of specified value

3. Process Management
Implement dual control system:

• Progress Control:
  • 4D BIM schedule simulation
  • Critical path monitoring

• Quality Assurance:
  • Multi-level inspection system (Self-check → Mutual check → Supervision)
  • NDT implementation:

• 100% UT for full penetration welds

• 20% MT for fillet welds

4. Technical Supervision
Qualified engineers shall:
• Conduct daily site patrols
• Maintain real-time quality records
• Enforce non-conformance handling:

1. Immediate work stoppage for critical defects

2. RCA (Root Cause Analysis) within 24h

3. Corrective action verification

This systematic approach ensures compliance with international standards (ISO 3834, AWS D1.1) while achieving efficient project delivery.