How China Built the World’s Largest 1.2M $m^2$ Railway Station Inside an 8D Mountain (Full Process)

Added: 2026-05-11

[00:00:06]We arrive at the site of the largest infrastructure project where massive cranes are working 24 hours a day to bring this ambitious vision to life.

[00:00:14]>> Look at this number. 16,500 tons of industrial steel hanging directly above us. To lift this colossal structure without any central pillars requires an unprecedented mechanical engineering breakthrough. Today we analyze the structural assembly sequence of the world's most complex high-speed railway hub. Chongqing is known as an 8D mountain city characterized by steep slopes and geological fault lines. The bedrock excavation phase required moving over 30 million cubic meters of earth and dense rock. Engineers anchored massive high strength stressed cables 50 m deep into the mountain slope. This critical stabilization prevents landslide risks and secures the foundation of the mega project. The core loadbearing system relies on towering support columns called the Hang Jouer pillars. These 41 m structures mimic the force distribution system of local ancient tree roots. Inside each column is a heavyduty H-shaped steel core wrapped in C60 self-consolidating concrete. Continuous concrete pouring is mandatory to prevent any microscopic air bubbles or internal fractures. This dense composition absorbs the intense kinetic vibration transmitted from high-speed trains running below. From the top of the columns, steel branches extend outward to form a rigid structural bed. These heavy branches support the large span dome without any intermediate columns in the hall. Let us trace the path of these giant structural pipes. Starting inside the automated steel mill, here flat plates of high-grade alloy are heated to precisely 12,200° C, massive rollers bend the glowing metal plates into perfectly uniform cylinders with ease. A longitudinal seam welder joins the edges under extreme temperature to ensure structural integrity. Each tube is then cut by computer-controlled industrial laser cutters to exact lengths.

[00:02:08]Heavyduty transport trucks carry these massive components along winding misty mountain passes. Upon arrival at the site, they are sorted by heavy gantry cranes with extreme care. The alignment phase begins matching the pipe edges within a microscopic tolerance limit.

[00:02:24]Hydraulic clamps secure the 80 mm thick steel walls in a rigid holding position.

[00:02:30]The first pass of welding uses manual gas tungsten arc methods for the root weld. For the main structural layers, automated submerged arc welding takes over the process. Intense blue welding sparks shower down as the robotic arm glides steadily along the joint. The thermal energy must be carefully monitored to prevent molecular distortion of the alloy. After cooling, the finished weld joint is cleaned of protective slag using pneumatic hammers.

[00:02:57]Now, the quality control inspectors set up their advanced testing equipment at the node. Ultrasonic phased array scanners are placed directly onto the smooth metallic weld surface.

[00:03:07]Highfrequency sound waves travel through the steel to map the internal atomic structure. Any microscopic pocket of gas or slag inclusion will register immediately on the screen. Even a 0.5 mm flaw requires the joint to be cut and welded again. With quality verified, these completed sections are prepped for the monumental lift ahead. Let us examine the incredible mechanical lifting system designed specifically for this task. Engineers position heavy computerc controlled hydraulic strand jacks on top of the concrete pillars.

[00:03:38]These compact machines utilize bundles of high strength steel cables to pull heavy loads upward. Each strand jack can lift hundreds of tons with absolute precision and safety. Technicians slowly feed the thick steel cable bundles through the clamping wedges of the jack.

[00:03:54]The hydraulic cylinder extends, gripping and pulling the cable strands in a step-by-step motion. A central control computer monitors the hydraulic pressure of every jack in real time. Any minor variance in lifting speed is corrected within milliseconds by the automated system. This active load balancing software prevents the massive steel frame from twisting during the process.

[00:04:15]Temporary steel support towers are built around the site to stabilize the assembly zones. These massive yellow structures hold the weight of the steel modules before the lift. High-capacity load cells are attached to the base of each tower to measure force distribution. Engineers study the digital data flow to ensure there are no uneven stress concentration zones. Wind sensors are installed at the highest points of the construction site to track gusts. The lift can only proceed when local wind speeds are well below the strict safety limits. Deep in the control center, complex algorithms simulate the thermal expansion of the steel dome. Direct sunlight can cause the massive metal frame to expand by several critical centimeters. The structural design must accommodate these daily temperature swings without losing alignment. Every single connector bolt is measured and marked with a unique tracking code. The heavy rigging crew begins checking the primary attachment shackles with meticulous care. All hydraulic fluid lines are pressurized and the pressure levels stabilize perfectly. Engineers now initiate the trial lifting process, raising the roof by just 10 cm. This tiny clearance allows the team to verify structural load paths and tension balance. We monitor the stress meters closely as the heavy steel frame clears its ground supports.

[00:05:32]>> The scale of this project is truly unprecedented. The main truss weighing over 500 tons is the backbone of the new infrastructure. The load distribution data is flawless, indicating no stress concentration on any node. With the trial lift complete, the main lifting sequence is officially authorized to begin. The hydraulic cylinders move in synchronized cycles, raising the massive dome millimeter by millimeter. The rhythmic mechanical hum of the strand jacks echoes through the cavernous concrete hall. Laser tracking sensors continuously scan the height coordinates of all 64 lift points. This massive array of sensors ensures that the elevation differences stay under 2 mm.

[00:06:12]The lift continues smoothly through the afternoon as the structure rises above the city. As the elevation increases, wind resistance becomes the primary concern for the safety team. High altitude crosswinds exert heavy lateral forces on the suspended 16,000 ton frame. To counter this, high tension stabilization cables are anchored tightly to the concrete foundations.

[00:06:35]These stabilization lines absorb lateral sway, keeping the gigantic dome perfectly centered. Engineers on the ground check the digital strain gauges of these lateral lines continuously. The tension levels are adjusted dynamically by automated winches to maintain perfect balance. Hour by hour, the colossal structure edges closer to its permanent resting height. The golden evening sun reflects off the polished alloy pipes, creating a stunning industrial vista.

[00:07:02]Night falls over the grand construction site as the final docking sequence is carefully prepared. Powerful industrial flood lights illuminate the colossal steel framework, cutting through the thick mountain mist. The lift speed slows to a mere 10 cm hour for the final touch. Every coordinate of the massive structure is measured down to the micrometer by laser guidance. We observe the primary connecting brackets as they slowly close the distance to the columns. The immense structural load is transferred from the strand jacks to the permanent support plates. Engineers monitor the pressure decay of the hydraulic systems as the structure settles into place. The massive steel roof is now resting entirely on the tree root concrete pillars. Rigging crews begin disconnecting the lifting strand cables with heavy hydraulic impact wrenches. Each thick cable bundle is carefully reeled back into its storage drum on the ground. Technicians now position massive high tensile alloy bolts into the primary structural connection joints. These bolts are tightened to precise torque limits using digital hydraulic torque wrenches. Every single bolted joint is cross-cheed and certified by two independent quality control teams. To ensure absolute structural stability, welding robots are deployed to apply the permanent seal.

[00:08:17]The blinding blue glare of automated welding illuminates the night sky above the station. This dual mechanical and welded connection system provides maximum resistance against seismic activity. The temporary yellow support towers are now ready to be systematically disassembled. Heavyduty cranes slowly lower the thick steel support columns down to the ground level. The open space of the grand main hall is revealed in its full architectural glory. Looking up, the immense steel canopy appears to float weightlessly above the terminal floor.

[00:08:48]With the structural shell complete, work shifts directly to the mechanical and electrical core. Technicians install complex climate control systems inside the hollow spaces of the dome framework.

[00:09:00]Thousands of energyefficient smart LED lights are integrated along the curves of the steel pipes. These smart lighting nodes will illuminate the entire terminal with uniform natural looking daylight. Deep beneath the main hall, railway engineering teams begin installing the high-speed track system.

[00:09:17]Heavyduty machines lay down concrete ballastless track slabs with extreme geometric precision. Each steel rail section is welded continuously to eliminate seams and reduce train noise.

[00:09:29]This seamless rail configuration allows trains to glide smoothly through the station at high speeds. A complex network of copper overhead contact wires is suspended to supply stable electrical power. High tension insulators are tested under high voltage to guarantee absolute operational safety. The terminal's central digital brain is installed inside a climate controlled server room. This central AI system will manage train schedules, passenger flows, and energy consumption automatically.

[00:09:58]Thousands of realtime sensory devices keep a constant check on every structural component. Any minor shift in the concrete pillars is instantly reported to the control center. The first high-speed test train slowly enters the newly built platform under manual control. Sophisticated laser scanners verify that the clearance between train and platform is perfectly aligned. This major transit hub connects three of China's most vital high-speed rail lines. Over 100 million passengers are expected to pass through these gates every year. The mega project stands as a powerful testament to the limits of modern mechanical engineering. By conquering the rugged terrain of Chongqing, engineers have redefined the rules of construction. The modular assembly techniques perfected here will serve as a global blueprint for future hubs. Every joint, every bolt, and every column represents a victory over extreme physical forces. If you are fascinated by the sheer scale of modern manufacturing, subscribe to Quantum K Manufacturing. Join us on our next journey as we continue to unlock the world's greatest mega structures.

[00:11:04]>> The scale of the Chonking East Terminal is breathtaking. This project utilized over 50,000 tons of steel.