Animagraffs' mini-documentary, 'How the Golden Gate Bridge Works,' delves into the engineering behind the iconic structure. It meticulously dissects the construction process, piece by piece, revealing the intricate details that went into creating this engineering marvel. The video-essay, a product of months of work by Jake O'Neal, uses colour-coding to distinguish structural elements and includes a human figure for scale, enhancing the viewer's understanding of the bridge's immense size.
The documentary starts with the foundations, detailing the excavation of the bedrock for the anchorages and the two piers in the bay. The construction of the south pier, located nearly 350 metres from the shore and 30 metres below sea level, is particularly fascinating. The video illustrates the challenges of underwater excavation using explosives and the subsequent construction of a reinforced concrete barrier by divers using massive blocks.
The construction of the bridge's cables is another highlight. Contrary to common belief, the cables are continuous, spanning the entire 2,300 metres between anchorages. Each cable comprises over 27,500 galvanised wires, grouped into 61 strands, each containing approximately 452 wires. The documentary meticulously explains the process of spinning these wires using a complex mechanism, highlighting the precision and calculations involved in ensuring the cables' strength and integrity.
The bridge deck, which supports traffic and vehicles, is susceptible to expansion and contraction due to weather changes. The documentary explores the sophisticated expansion joint system and mechanisms that accommodate these movements, with the bridge potentially moving several metres vertically and laterally. The towers themselves house 37 km of internal staircases and passageways, requiring technicians to use detailed 26-page manuals for navigation. Over 600,000 rivets were used per tower, all placed manually. The video also touches on lesser-known facts, such as the loss of a caisson during a storm and the precision levelling of the tower bases.
Fuente Original: https://www.microsiervos.com/archivo/ingenieria/ingenieria-construccion-puente-golden-gate-explicada.html
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