00:00Who would have thought this overseas lake crossing bridge was built this way?
00:03First step isn't breaking ground, it's setting up survey instruments,
00:06precisely marking the entire route, locking every pier position and bridge alignment in advance.
00:11Once positions are confirmed, cranes immediately move in, steel sheet pile
00:15cofferdams are driven into the lake bed ceiling off the construction zone completely,
00:19blocking all external water flow, then every drop inside is pumped out.
00:23What was underwater environment instantly becomes dry workable ground.
00:27Once the site is exposed, drilling rigs move in immediately,
00:30boring downward until hitting the hard load bearing layer at the bottom.
00:33Steel casings lock the borehole walls preventing collapse.
00:36Large rebar cages are then crane lifted into the pile holes, concrete poured forming drilled piles,
00:41locking the underwater load bearing layer permanently.
00:44With pile foundations complete, structure starts growing upward, rebar cages assembled layer by layer,
00:50scaffolding erected simultaneously for high altitude work, steel formwork assembled,
00:54concrete poured in continuous sections to avoid single-pore cracking, pier growing upward level by level.
00:59Once piers are fully formed, outer formwork removed, cap beams poured across multiple pier tops,
01:04widening the load bearing surface, distributing the entire bridge weight downward, connecting every pier into one unified system.
01:11Once the main load bearing system stabilizes, surrounding cofferdams are removed,
01:15lake water returns, but underwater structure is permanently fixed.
01:19Construction shifts to both banks, approach spans excavated, bottom rebar mesh laid,
01:23first concrete layer poured as leveling pad, locking the base bearing layer.
01:27Rebar structures continue upward, concrete poured again raising the foundation to near ground level.
01:33Rebar cages erected above, formwork assembled, concrete poured layer by layer,
01:37rising until matching main pier height, bringing both banks to the same elevation as the main bridge.
01:42Bridge deck phase begins, formwork set above the structure, rebar mesh laid,
01:46concrete poured forming the deck slab directly bearing vehicle loads.
01:50Once formwork removed, completed bridge deck formed.
01:53Guardrails installed on both sides completing the safety structure.
01:56Large volumes of crushed stone backfilled raising both bank road bases to bridge deck level,
02:01road roller compacting repeatedly layer by layer.
02:04Insufficient compaction means guaranteed future settlement and cracking.
02:08Once road base stabilizes, asphalt paving begins, compacted and set, traffic markings painted,
02:13all auxiliary facilities completed.
02:15The entire load bearing loop is now fully locked, this late crossing bridge is truly standing.
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