In large-scale engineering construction, gantry cranes, as critical lifting equipment, directly impact project progress and personnel safety. The formulation of a special safety plan must be based on equipment characteristics, operational environment, and industry regulations to establish a systematic risk prevention and control system. This plan covers full-cycle management from preliminary preparation to post-operation improvement, ensuring all aspects of lifting operations are under control through a combination of standardized procedures and dynamic monitoring. Given the large span and heavy loads characteristic of gantry cranes, the plan places particular emphasis on structural stability verification and foundation bearing capacity assessment, while establishing a multi-level emergency response mechanism. Scientific safety management not only reduces accident rates but also enhances lifting efficiency, providing reliable assurance for engineering projects.
Gantry crane lifting operations are an indispensable part of industrial production and engineering construction. Such operations involve the transportation, installation, and dismantling of large equipment, forming a core component of many projects. Due to the complexity and inherent danger of lifting operations, accidents often lead to severe consequences, including casualties, equipment damage, and project delays. Therefore, establishing a scientific and reasonable safety control plan is crucial.
Based on technical standards such as GB/T 3811-2008 “Crane Design Code” and TSG Q7015-2016 “Rules for Periodic Inspection of Lifting Appliances”, this plan will establish a safety management system covering the entire lifting cycle. From pre-operation preparation, execution, to post-operation completion, we will comprehensively consider various safety factors to ensure every step complies with safety regulations.
The core objective of this plan is to achieve zero accidents and zero injuries in lifting operations. This requires efforts in multiple aspects: systematic risk pre-control, predicting and assessing various potential risks during operations and taking corresponding preventive measures; developing standardized operational procedures to ensure each step is performed as specified, avoiding violations and misoperations; and establishing a scientific emergency mechanism to enable rapid response and effective emergency measures in case of accidents or incidents, minimizing losses and impact.
Before lifting operations, a comprehensive safety inspection of the site must be conducted. First, within a 15-meter operational radius, three-dimensional space scanning is required to eliminate any hidden structures, such as underground pipelines or cable trenches, that may interfere with the lifting. Ground bearing capacity is also a key inspection point, ensuring it meets a minimum standard of 16 kPa to prevent accidents caused by insufficient capacity. Furthermore, for open-air operations in wind speeds exceeding 8.3 m/s, ultrasonic wind speed warning devices must be installed to alert personnel. For nighttime operations, illumination intensity must be no less than 50 lux, and laser projection warning boundaries should be set up in the crane boom rotation area to ensure personnel safety.
Table: Lifting Site Environmental Inspection Checklist
| Inspection Item | Inspection Standard/Requirement | Inspection Method/Tool | Safety Measures/Remarks | Relevant Regulations/Documents |
|---|---|---|---|---|
| Operational Radius Scan | No hidden structures within 15-meter radius | 3D Space Scanner | Eliminate interference from underground pipelines, cable trenches, etc. | Hidden Structure Survey Report |
| Ground Bearing Capacity | ≥ 16 kPa | Foundation Bearing Capacity Tester | Prevent ground collapse during lifting | Geotechnical Investigation Report |
| Wind Speed Monitoring | ≤ 8.3 m/s (for open-air operations) | Ultrasonic Wind Speed Warning Device | Suspend operations when exceeding limit | Meteorological Monitoring Record |
| Nighttime Illumination | ≥ 50 lux | Illuminance Meter | Set laser projection warning boundaries in boom rotation area | Lighting Facility Acceptance Form |
| Aerial Obstruction Check | No aerial obstructions (e.g., power lines, scaffolding) | Drone Inspection | Mark safe height ranges | High-Altitude Work Permit |
Table: Lifting Equipment Safety Inspection Checklist
| Inspection Item | Inspection Standard/Requirement | Inspection Method/Tool | Qualification Standard | Relevant Documents |
|---|---|---|---|---|
| Equipment Legality Check | Complete “Three Certificates and One Report” | Document Review | Factory certificate, inspection report, daily checklist record, flaw detection report | Equipment File |
| Main Girder Weld Inspection | No cracks, lack of fusion defects | Magnetic Particle Flaw Detector | Complies with NB/T 47013.4 standard | Weld Inspection Report |
| Brake Static Load Test | No slippage at 125% rated load | Load Test Platform | Holding time ≥ 10 minutes | Brake Performance Test Record |
| Electrical System Insulation | ≥ 1 MΩ | Megohmmeter | Independent testing for each circuit | Electrical Safety Inspection Report |
| Wire Rope Condition | No broken wires, deformation | Visual Inspection + Flaw Detector | Wear < 7% of nominal diameter | Flaw Detection Report (Last 3 months) |
Before lifting operations, a comprehensive safety inspection of the lifting equipment must be conducted. The “Three Certificates and One Report” verification mechanism is adopted: the equipment factory certificate, periodic inspection report, daily checklist records, and the wire rope flaw detection report from the last three months. These documents prove the equipment’s legality and safety, ensuring it operates normally during lifting and preventing accidents. Beyond document verification, on-site equipment inspection is necessary. Main girder welds require magnetic particle flaw detection to identify and repair potential welding defects. The hoisting mechanism brake must undergo a static load test at 125% of the rated load to ensure reliable stopping and lowering during lifting. Additionally, the electrical system must complete insulation resistance testing, with values not less than 1 MΩ. Lower insulation resistance could lead to electrical faults or fire hazards.
Before lifting operations, all involved personnel must undergo qualification verification and training. Special operations personnel must hold a Q2-type crane operator certificate issued by the construction department, with no violation records in the past three years. This certificate proves the personnel possess the necessary skills and knowledge for safe crane operation. An 8-hour specialized training session must be completed before work, covering load calculation software use, anti-sway control system operation, and BIM lifting path simulation. This training helps personnel better understand and use related equipment and systems, improving operational efficiency and safety. Each shift must be staffed with two signalers/riggers, both of whom must pass dual-mode assessment for hand signals and radio communication. Signalers/riggers are responsible for directing crane operators and must possess clear signaling abilities and good communication skills to ensure safe and smooth operations.
During lifting operations, the “Five-Step Confirmation Method” must be strictly implemented to ensure safety and effectiveness. First, based on factors like the load’s weight, dimensions, and shape, select the appropriate rigging gear and perform necessary calculations and verification to ensure the gear’s rated capacity meets requirements. Second, calculate the load’s center of gravity position and stability based on the load’s center and rigging arrangement, ensuring no instability or overturning during lifting. Simultaneously, choose the appropriate slinging method based on the load’s shape and size to prevent slipping or damage during lifting. After slinging, perform a trial lift off the ground to confirm the load is stable, rigging is secure, and slings are reliable, ensuring pre-lift preparations are complete. Finally, during lifting, check the path for obstacles or potential collisions with other equipment/structures to ensure path safety and feasibility. For loads exceeding 80% of the rated capacity, computer-aided balance calculations must be used, and real-time stress monitoring sensors installed at lift points to ensure safety and stability. Using non-standard rigging or uncalculated temporary welded lift points is strictly prohibited to prevent accidents.
During lifting, to ensure comprehensive and real-time safety monitoring, a multi-sensor fusion monitoring system is deployed. This system includes inclinometers, load limiters, anti-collision LiDAR, etc., to monitor lifting status and environmental changes in real-time. Data refresh rate must be no less than 10 Hz to provide timely feedback. Three-level warning thresholds are set: Level 1 Warning (90% rated load) triggers audible/visual alarms, Level 2 (100%) automatically cuts off hoisting power, and Level 3 (110%) activates emergency braking. These warnings help identify and correct potential safety risks promptly to avoid accidents. To ensure the monitoring center is aware of the cab status, 5G real-time video transmission is maintained between the monitoring center and the cab, allowing real-time monitoring and prompt issue resolution.
To ensure smooth and safe lifting operations, a “1+3+N” communication network is established. “1” represents the main command channel for overall command and coordination. “3” represents three backup channels for use if the main channel fails. “N” represents multiple sub-channels for monitoring equipment status in real-time. This network design ensures timely and accurate command and monitoring under various conditions. Additionally, noise-canceling bone conduction headsets are provided to ensure clear and reliable communication in noisy environments, allowing operators to hear commands accurately. For critical command transmission, a “repeat-back and confirm” system is used. After the commander issues an instruction, the operator must repeat the instruction content and confirm, ensuring accuracy and preventing operational errors due to misunderstanding. Furthermore, if the lifting path changes, a new JSA (Job Safety Analysis) must be conducted to ensure safety and feasibility, avoiding potential risks due to path alterations.
For lifting operations, we employ the HAZOP (Hazard and Operability Analysis) method to comprehensively and systematically identify and assess potential risks. Through this analysis, 22 main categories of potential risks have been identified, including but not limited to: main girder structural instability, wire rope breakage, and uncontrolled load swing. The probability and impact of these risks vary, but all require focused attention and control. The probability of main girder instability is low (0.03%), but its consequences are extremely severe. Wire rope breakage risk, though relatively higher (0.01% probability), must be strictly controlled as it can lead to serious accidents. Uncontrolled load swing, more common in daily operations (1.2% probability), also requires sufficient attention as it may cause injuries or equipment damage.
For these risks, not only have they been comprehensively identified and analyzed, but a prediction model based on CFD (Computational Fluid Dynamics) has also been established. This model can predict load swing caused by sudden wind changes 30 seconds in advance, allowing for early evasive measures to ensure safe operations.
Table: Lifting Operation Risk Identification and Assessment Table
| Risk Type | Probability | Impact Severity | Risk Level | Response Measures | Prediction/Control Technology | Emergency Equipment/Resources |
|---|---|---|---|---|---|---|
| Main Girder Instability | 0.03% | Extremely Severe | Red | Immediately halt operations, conduct structural reinforcement and comprehensive inspection | Structural Health Monitoring System | 200-ton hydraulic jacking system, polymer cutting equipment |
| Wire Rope Breakage | 0.01% | Severe | Red | Halt operations, replace wire rope, and inspect lifting equipment | Wire Rope Non-Destructive Testing Technology | Spare wire rope, quick sling release tools |
| Uncontrolled Load Swing | 1.2% | Moderate to Severe | Yellow | Activate dual-person supervision, use anti-sway control system | CFD Prediction Model (30-second advance) | Automatic Anti-Sway Control System |
| Sudden Power Failure | 0.5% | Moderate | Yellow | Activate hydraulic accumulator emergency release system for safe lowering | Uninterruptible Power Supply (UPS) | Hydraulic accumulator, emergency lighting |
| Strong Wind Conditions | 2.1% | Moderate | Yellow | Activate automatic anti-sway control system, halt operations if necessary | Real-time Wind Speed Monitoring System | Wind speed sensors, anti-sway control devices |
| Operational Error | 3.5% | Low to Moderate | Blue | Enhance training, implement dual-person confirmation system | Simulated Operation Training System | Operation manuals, real-time monitoring system |
| Equipment Failure | 1.8% | Moderate | Yellow | Immediately stop for maintenance, activate backup equipment | Equipment Condition Monitoring System | Spare parts, rapid repair toolkit |
Table: Lifting Operation Emergency Response and Rescue Preparedness Table
| Emergency Scenario | Response Time | Rescue Measures | Medical Support | Drill Frequency | Key Equipment/Technology |
|---|---|---|---|---|---|
| Gantry Collapse | ≤5 minutes | Stabilize structure with hydraulic jacks, separate damaged components with cutters | Trauma Green Channel (within 3 km) | Quarterly | 200-ton hydraulic jacking system, polymer cutting equipment |
| Personnel Fall | ≤3 minutes | Rescue with High-altitude rescue equipment, on-site first aid, then transport to hospital | Tertiary Hospital Green Channel | Monthly | High-altitude rescue kit, first aid kit |
| Electric Shock | ≤2 minutes | Cut power supply, rescue using insulated equipment | CPR support | Biannually | Insulating pole, AED defibrillator |
| Fire | ≤4 minutes | Activate fire suppression system, evacuate personnel | Burn specialty support | Quarterly | Automatic fire suppression system, fire blanket |
| Sling Failure | ≤5 minutes | Use backup slings, stabilize load with jacking system | _ | Quarterly | Backup slings, hydraulic stabilizer |
| Sudden Weather Change | ≤10 minutes | Stop operations, secure load, evacuate personnel | _ | Annually | Real-time weather monitoring system |
| Chemical Spill | ≤5 minutes | Isolate source, handle with absorbent materials | Poisoning treatment support | Biannually | Chemical protective clothing, absorbent pads |
Corresponding response measures and plans are developed for different risk levels. For Blue risks (Acceptable), conventional control measures are used, such as enhanced monitoring and increased vigilance. For Yellow risks (Requiring Attention), a dual-person supervision mechanism is activated to ensure dedicated oversight and guidance during operations. For Red risks (Unacceptable), operations are immediately halted, and corresponding corrective and preventive measures are taken.
Our plan library contains 17 standardized disposal procedures covering various potential emergencies. For example, in case of sudden power failure, the hydraulic accumulator emergency release system is activated to ensure safe operations. Under strong wind conditions, the automatic anti-sway control system is activated to prevent accidents caused by load swing. These plans are based on realistically possible scenarios to ensure rapid and effective response in emergencies.
To ensure rapid and effective rescue and emergency handling, an emergency rescue kit containing a 200-ton hydraulic jacking system and polymer cutting equipment is deployed/positioned on-site. This kit can complete tasks like structural component jacking or quick sling separation within 15 minutes. Furthermore, a trauma first aid green channel has been established with tertiary hospitals within a 3 km radius to ensure timely medical treatment post-accident. To test and improve emergency response capability, simulated gantry collapse drills are conducted quarterly, ensuring emergency response time is controlled within 5 minutes. Implementing these measures and plans will significantly enhance the safety and emergency handling capability of lifting operations, ensuring smooth progress.
In recent lifting operations, using the PDCA cycle tool, we analyzed 368 process data points in-depth, extracting key performance indicators. These include an average load rate of 67%, indicating high operational efficiency, a maximum sway angle of 2.3°, and a command response delay of only 0.8 seconds, demonstrating high stability and precision. Through Bow-tie model analysis, the effectiveness of existing safety protective measures was validated, showing these controls successfully reduced the probability of major risks by 89.7%.
Despite significant achievements, some issues persist. For example, we identified blind spots in wire rope lay length inspection and insufficient nighttime visibility compensation, totaling 6 defects requiring resolution. To address these, we plan to introduce a machine vision-based automatic wire strand wear detection system for real-time, precise inspection. Simultaneously, we will upgrade monitoring equipment to a 4K monitoring array with infrared enhancement to improve nighttime visibility. For communication channel interference, we are testing the applicability of Frequency-Hopping Spread Spectrum (FHSS) technology to find an effective solution.
To further improve the safety and efficiency of lifting operations, it is recommended to update the risk database every 6 months. By integrating 137 new risk factors from the industry accident case database, we can better understand and prevent potential risks. Additionally, we should promote the construction of a digital management platform to enable automatic generation of lifting plans, intelligent risk assessment, and AI-based personnel behavior recognition. This will greatly enhance work efficiency and management levels. Finally, we should explore the application of digital twin technology in virtual lifting pre-simulation, using digital simulation for previews and plan validation, helping to shorten the plan verification cycle by 40% and improve plan accuracy and feasibility.
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