The "Coat Hanger" 🧥 How They Built a 52,000-Ton Bridge Without Safety Harnesses скачать в хорошем качестве

The "Coat Hanger" 🧥 How They Built a 52,000-Ton Bridge Without Safety Harnesses

When you think of Sydney, you think of the Opera House. But the real engineering giant is the "Coat Hanger" standing right next to it. 🇦🇺🏗️ Built during the Great Depression by men balancing hundreds of feet in the air, the Sydney Harbour Bridge is a 52,000-ton beast held together by 6 million rivets. In this video, we reveal how "Creeper Cranes" built it over open water, why it needs hinges to breathe, and the terrifying moment the two halves didn't fit! . 【Key Takeaways from this Video】 1. The Design Choice: Arch vs. Suspension 📐 • Suspension bridges were too wobbly for heavy trains. • They chose a Two-Hinged Steel Arch because it relies on Compression. The more weight you put on it, the tighter it locks together. 2. Why Does a Bridge Need Hinges? 🌡️ • Thermal Expansion: On a hot Australian summer day, the steel expands and the bridge rises by 18 cm (7 inches). • The hinges allow the bridge to rotate and "breathe" without cracking apart. 3. The "Creeper Cranes" 🏗️ • They couldn't use scaffolding over deep water. • Solution: "Creeper Cranes" sat on top of the arch, built the track in front of them, and slowly crawled forward over the water until the two halves met. 4. The Rivet Ballet 🔨 • Welding wasn't trusted yet, so the bridge uses 6 million hand-driven rivets. • Teams threw white-hot metal bolts 20 feet through the air to be caught in buckets and hammered in before they cooled. 5. The Brute Force Test 🚂 • To prove it was safe in 1932, they parked 96 steam locomotives end-to-end across all four tracks at the same time. The bridge didn't flinch. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ #Engineering #SydneyHarbourBridge #Architecture #History #Construction #CivilEngineering #Australia #Megastructures