1. Global Construction Strategy
1.1 Construction Methodology Type
- Top‑down + bottom‑up hybrid construction
- Slipform reinforced concrete core
- Modular steel mega‑frame + outrigger system
1.2 Vertical Construction Zones
| Low Zone | 0–200 m — Conventional crane + slipform core |
|---|---|
| Mid Zone | 200–600 m — Jump‑form + climbing cranes |
| High Zone | 600–900 m — Modular lift + derrick cranes |
2. Foundation & Base Stage
2.1 Pile Foundation System
- Bored cast‑in‑place piles
- Diameter: 2.5–3.5 m
- Depth: 60–95 m
- Spacing: 6–8 m grid
2.2 Raft Foundation
- Thickness: 6–8 m
- Concrete Grade: C80–C100
- Rebar Density: 350–500 kg/m³
Engineering Logic
Distributes over 1,000,000 tons of structural load and prevents differential settlement within a tolerance of 25 mm.
3. Core Construction (Slipform System)
3.1 Core Dimensions
- Base: 30 × 30 m
- Wall Thickness:
- Base: 1.5–2.0 m
- Mid: 0.8–1.2 m
- Top: 0.4–0.6 m
3.2 Slipform Rate
- Vertical progress: 3–5 m/day
- Cycle time per level: ~24 hours
3.3 Embedded Systems Installed During Core Rise
- Elevator guide rail inserts
- MEP riser sleeves
- Fire‑rated shafts
Engineering Logic
The core acts as the primary lateral stability spine and enables parallel steel erection.
4. Structural Steel Erection
4.1 Mega Columns
- Spacing: 18–24 m grid
- Composite box columns
- Dimensions: 1.5 × 1.5 m to 3 × 3 m
4.2 Floor Framing
- Beam spacing: 3–4.5 m
- Deck thickness: 120–150 mm
4.3 Lift Weights
- Typical beam: 8–20 tons
- Mega column segment: 40–120 tons
5. Crane Positioning & Lift Strategy
5.1 Tower Cranes
- Climbing tower cranes
- Initial height: 80–120 m
- Max height: 900 m
5.2 Crane Quantity
- Base phase: 4–6 cranes
- Peak phase: 8–12 cranes
5.3 Lift Radius
- Typical: 25–60 m
- Max load at radius: 15–25 tons
5.4 Derrick Cranes
- Installed above 600 m
- Lift capacity: 10–20 tons
Engineering Logic
Crane zoning prevents collision and ensures continuous workflow.
6. Modular Assembly System
6.1 Prefabricated Modules
- Steel frame sections
- MEP racks
- Curtain wall panels
6.2 Module Dimensions
- Width: 3–6 m
- Length: 6–12 m
- Weight: 10–35 tons
6.3 Installation Tolerance
- Alignment: ±5 mm
- Vertical plumb: H/1000
Engineering Logic
Prefabrication reduces on‑site labor by 30–50% and improves quality control.
7. Temporary Support Systems
7.1 Temporary Bracing
Steel cross‑bracing every 3–5 floors
7.2 Shoring Systems
Load capacity: 50–150 kN per post
7.3 Wind Stabilization
Temporary tie‑backs every 100 m vertically
Engineering Logic
Prevents instability before full structural continuity — critical in high‑wind environments.
8. Outrigger & Belt Truss Installation
8.1 Outrigger Levels
- Every 25–30 floors
- Spacing: 100–120 m
8.2 Installation Sequence
- Core completed to level
- Steel outrigger arms installed
- Connection to mega columns
- Post‑tensioning / locking
Engineering Logic
Transfers lateral loads to perimeter columns and reduces building drift by 30–40%.
9. Floor System Installation
9.1 Slab System
Composite steel deck + concrete topping (120–150 mm)
9.2 Pour Cycle
1 floor every 3–5 days
9.3 Load Limits
Max temporary load: 3–5 kPa
10. Facade Installation (Parallel Process)
10.1 Curtain Wall Panels
Unitized system — 1.5 × 3.5 m panels
10.2 Installation Lag
10–15 floors below active structure
Engineering Logic
Enables early enclosure and reduces wind exposure on upper levels.
11. MEP Installation Sequencing
11.1 Vertical Risers
Installed immediately after core completion
11.2 Horizontal Distribution
Installed after slab curing
11.3 Prefabricated Racks
Plug‑and‑play modular installation
12. Construction Cycle Timeline
| Steel Erection | 1–2 days |
|---|---|
| Deck Installation | 1 day |
| Rebar + MEP Rough‑In | 1 day |
| Concrete Pour | 1 day |
| Curing & Prep | 1–2 days |
Total: ~4–6 days per floor
13. Safety & Risk Management
13.1 Wind Limits
- Crane stop: > 20 m/s
- Full evacuation: > 30 m/s
13.2 Fall Protection
Perimeter safety screens every 3 floors
13.3 Fire Safety During Construction
Temporary standpipes every 20 floors
14. Logistics & Material Flow
14.1 Vertical Transport
- Temporary hoists: 60–120 m/min
- Capacity: 2–4 tons
14.2 Material Staging Floors
Every 20–30 floors
14.3 Just‑in‑Time Delivery
- Reduces site congestion
- Synchronized with crane schedule
15. Final Top-Out & Commissioning
15.1 Structural Top-Out
Installation of final steel + crown
15.2 Crane Removal
Derrick cranes dismantle tower cranes
15.3 Load Testing
- Structural deflection testing
- Elevator commissioning
16. Performance Targets
| Total Construction Time | 5–7 years |
|---|---|
| Max Vertical Rate | 1 floor / 4 days |
| Structural Alignment Accuracy | ±10 mm |
| Core Vertical Deviation | < H/2000 |
17. Engineering Summary
- Continuous vertical progression without bottlenecks
- Parallel workflows: core + steel + façade + MEP
- Structural stability at all stages
- Maximum efficiency at extreme height (900 m)
