The review of the deep hole gate fall accident at the Three Gorges Flood Discharge is suffocating: At the moment when the hydraulic system collapsed and the electronic limit failed, the out-of-control gate hit the bottom embankment at a speed of 2.3 meters per second. At a critical juncture of life and death, the tungsten steel pin of the heavy hammer limit switch popped out within 0.28 seconds, forcibly seizing the spoke plate of the drum and trapping the 800-ton steel gate...

At the moment when the ship lift cabin at Xiangjiaba entered the water, the monitoring system suddenly triggered an alarm: the height of the left hook head downstream deviated abnormally by 67 millimeters! The hook head limit switch immediately initiates a three-level response - first cutting off the power supply of the main hoisting motor, then activating the hydraulic deviation correction system, and finally resetting the hook head to the safe envelope zone through laser guidance. Post-event arrangement...

In the monitoring room of the Three Gorges Ship Lock, the alarm sound broke the silence of the early morning - the downstream A-frame gate suddenly accelerated during the closing process, with the drum speed exceeding the limit by 120%! At the critical moment, multiple anti-overrolling switches acted simultaneously: the heavy hammer mechanism was the first to trigger the mechanical latch to lock the drum, and the laser ranging module confirmed that the door body exceeded the safety line by 0.3...

A terrifying scene once occurred at the water level monitoring center of the Anqing section of the Yangtze River: the opening degree of the arc-shaped gate was stable at 4.5 meters, but the load data suddenly dropped sharply from 230 tons to 65 tons. The dispatcher urgently locked the gate - a diving inspection revealed that the crossbeam at the bottom of the gate had twisted into an S shape. This classic case validates the iron law of water conservancy projects: the degree of opening...

In front of the spillway tunnel of a large hydropower station by the Lancang River, engineers repeatedly checked the opening degree data on the control panel. The gate is driven by two hydraulic hoists with a thrust of 500 tons, but the opening degree value displayed in the main control room keeps fluctuating. The stroke of the hydraulic cylinder has been fed back by 75 centimeters, but the door top opening gauge only shows 68 centimeters - 7 centimeters...

Preface Amid the tense atmosphere at the flood control dispatching station, the water level information of several major rivers kept flashing. The operator is nervously watching the arc-shaped gate in the surveillance screen, ready to adjust the opening degree according to the instructions and control the downstream flow. But right after the opening and closing command was issued, the feedback value of the opening degree on the panel made one's heart race...

The weight of a thousand-pound deviation of 0.1° The slight change in the inclination Angle of the arc-shaped gate conceals a danger: Hinge settlement of 0.5° : It may cause the gate seal to fail, with a leakage rate of over 300 liters per second. Temperature deformation difference: A 40℃ temperature difference in summer causes metal deformation, which is equivalent to an 8cm deviation at the end of a 10-meter-span arc door. ...

I. Fatal Pain Points in Arc Gate Operation Due to the special structure of the arc-shaped gate, the consequences of losing control of the opening degree are more serious: An Angle deviation of 1° may cause a flow error exceeding 15%, leading to irrigation accidents. Hinge jamming: Slight deformation of the arc-shaped track will amplify the frictional resistance, increasing the risk of the drive motor burning out by 300...

I. Chain Crises of out-of-control Gates The sluice gate is the core hub for water diversion and flood control. A deviation in its opening degree may cause disasters. Over-limit opening: During heavy rain, the gate rises too high, causing sudden flooding downstream. Insufficient opening: During the drought period, the gate does not reach the predetermined height, causing the irrigation system to malfunction. Traditional manual pain monitoring...

I. The Fatal Weakness of Steel Ropes Steel wire ropes are the core load-bearing components of cranes, elevators and ropeways, but they hide risks that are invisible to the naked eye: Overload breakage: When the actual load exceeds the breaking strength of 60%, internal damage to the steel wire rope will accumulate rapidly. Relaxation hazards: such as steel wires of mine hoists...

​​ I. Invisible Threat: The Cost of Losing Control of Cables The mooring line is the lifeline between the ship and the dock, but the magnitude of the force cannot be judged by the naked eye. Overload hazard: When the tensile force exceeds the breaking strength of 70%, the cable may break at any time. The rebound speed at the moment of breakage exceeds 60 meters per second, which is sufficient to penetrate the steel plate. Song...

I. Hidden Threats of Mooring Operations When ships dock at the wharf, mooring ropes are the key defense line against wind, waves and tides. However, cable tension control conceals risks: When the tension exceeds the limit, the cable will break instantly. The rebound speed of the broken cable can exceed 60 meters per second, comparable to that of a cannonball. Insufficient tension causes the ship to drift. In mild cases,...