Video summary
(안전교육) 이동식 크레인 작업 안전
Main summary
Key takeaways
Main ideas / lessons conveyed
- Mobile crane work has a high risk of serious injury or death, and accidents can occur across many settings, including:
- construction/demolition sites
- scrap yards
- metal processing plants
- Mobile cranes are governed by multiple Korean safety/management laws. Safe operation depends on:
- understanding device definitions
- knowing crane types
- following manufacturer-specific procedures
- Preventing accidents requires a full safety management approach across the entire work lifecycle:
- planning → inspections → lifting → risk controls during lifting → safe completion/withdrawal
- Key risk categories repeatedly emphasized:
- Falls (cargo/attachments/workers)
- Being struck (falling/detached loads, wire/rope failures)
- Collisions and crush/pinch situations (including debris caused by crane overturning)
- Electric shock (contact with power lines)
Concepts and requirements explained
Legal/technical framing
Mobile cranes are covered by:
- Industrial Safety and Health Act
- Construction Machinery Management Act
- Automobile Management Act
A mobile crane is defined as equipment with:
- a built-in prime mover
- autonomous movement to non-specified locations
- power used to suspend and transport heavy objects in multiple directions
Types of mobile cranes
- Cargo cranes
- Truck cranes
- Crawler cranes
- Rough terrain cranes
- All-terrain cranes
Core safety principle
Follow the manual thoroughly, because safety operating procedures vary by manufacturer/model and equipment.
Detailed methodology / step-by-step safety checklist (lifting operations)
A) Before bringing in the equipment
- Prepare a work plan
- Verify required documents before equipment arrival/on-site setup
Risk points addressed here
- Driver unqualified
- Equipment uninsured
- Equipment brought in without a vehicle inspection certificate
- Working without a work plan
- Lifting capacity table not available
Safety management measures
- Use qualified personnel for operation
- Verify documents upon equipment introduction
- Ensure the work is performed only after the site manager approves the work plan
- Place the plan at the worksite
- Operate according to correct:
- working radius
- distance
- Use an appropriately specified crane (described as using a crane corresponding to 90% of the lifting capacity)
B) Pre-work self-inspection and establishing work zones
- Conduct pre-work self-inspection
- Set/establish work zones
Risk points addressed here
- Overturning risk, including:
- unsuitable crane specification
- outriggers not extended
- house/substrate conditions not checked
- Lifted object falling risk, including:
- excessively coiled/incorrect hoisting condition
- Collision risk, including:
- if a work zone is not established
Safety management measures
- Fully extend outriggers and use outrigger locking pins
- Check house/substrate condition; if needed:
- lay steel plate
- keep it at least 2 meters from the edge, or perform ground checking/measurement
- Prevent collisions by precisely setting the work area using:
- traffic cones, fences, etc.
C) Securing the load and executing the lift
- Secure materials to be lifted
- After all lifting-preparation steps are completed: lift the materials
- Terminate the task when complete
Risk points addressed here (securing materials)
- Single-line support
- Mixing/different specifications between lifting components
- Fastening with the shackle bolt facing upward
- Securing at the ends of materials
- Lifting forward causing tipping
Safety management measures
- Support the head to lift, or lift only materials of the same specifications
- Fasten the shackle bolt downward
- Lift by attaching a rope/belt at a point about halfway from both ends
- During lifting: lift to the rear or side (as indicated in the subtitle guidance)
D) Managing lifting capacity and wiring/electrical hazards during lifting
- Confirm load amount vs. rated total load (do not exceed capacity)
- Lift with proper wire rope handling and positioning
Risk points addressed here
- Exceeding load weight → wire breakage
- Collisions caused by shaking suspended object → wire rope can come off
- Contact with wires → electric shock and falls
Safety management measures
- Operate wire ropes properly considering lifting weight
- Place the crane rear end directly beneath the lifting object
- Use an auxiliary rope to guide the lifting
- Check surrounding power lines and hazards before starting work
- Lower the suspended structure to the ground
- Escape and control lower-level personnel
- Prohibit work during unsafe conditions (implied: stop and control operations during lowering/clearance)
E) Finishing work and withdrawing equipment
- Fully fold the boom and release outriggers correctly
- Secure the moving route in advance
- Check cockpit exit requirements
Risk points addressed here
- Releasing outriggers while the boom is raised → tipping
- Moving while interfering with power lines → electric shock
- Leaving the cockpit without confirming safety controls
Safety management measures
When withdrawing equipment:
- fully fold the boom
- release outriggers
- secure a path in advance to prevent electric shock or collision
Before leaving the cockpit:
- confirm safety measures are taken
- confirm control devices (e.g., PTO) are turned off
- confirm the boom is secured
Rated total load (capacity) explanation and how to use the load table
Definition
Rated total load is the maximum load that can be lifted, including the weight of lifting devices (hooks/slings), depending on:
- angle of inclination
- length of the crane’s support section / outriggers
The rated total load is verified through the lifting load table.
How to read the table
To determine the rated total load from the table, check:
- working radius (horizontal distance from slewing centerline to successor centerline)
- section length (outrigger/support length)
Example note (from subtitles)
With maximum outrigger width 7.3 m, working radius 7 m, and outrigger length 16 m, the subtitles mention inconsistent numbers; the intended instruction is to read the exact value from the load table for that configuration.
Driver/workplace requirements and workplace checks
Driver/operator requirements
- Confirm the driver is qualified
- Confirm the driver completed safety training
- Ensure the driver’s visual field is secured at all times
- Ensure guides and signalmen are stationed
- Perform work where mutual signaling can be verified
Workplace/environment checks
- Measure wind speed
- stop work if wind speed is 10 m/s or more
- Verify stability/ground:
- inspect bearing capacity
- inspect whether the site was excavated or backfilled
- Review critical fall and safety risks regarding the work range:
- verify work plans and countermeasures exist
- check access control inside the work radius for unauthorized personnel
- inspect for obstacles
Preventive measures by accident type
1) Fall accidents
How they happen
- Detachment of support bolts from boarding equipment
- Cargo falls while transporting
- Workers fall while suspended from the crane during movement
Prevention
- Prohibit transporting/lifting workers using mobile cranes
- If worker transport/work is necessary:
- install boarding equipment
- use an aerial work platform
- designate a qualified work supervisor for positioning supervision
2) Impact (“being hit”) accidents
How they happen
- Hook detachment during transfer operations
- Wire rope breakage during transfer operations
- Falling cargo during transport
Prevention
- Attach a hook release device (noted as “attached to the rear”) to prevent cargo from falling off
- Replace jointed wire ropes / stretched lifting chains with normal parts before use
- Secure transported items firmly to prevent loosening
3) Collision accidents / crush / pinch-related issues
Collision causes
- Collisions with the rear of the crane
- Collisions due to transfer operation approach conditions
- Collisions caused by falling debris when the crane collapses
Pinch causes
- Load tipping over during transfer
- Pinching between load and support wall
- Pinching caused by crane tipping over
Prevention
- Workers wear protective equipment
- Choose work locations with worker safety in mind
- Ensure no eccentricity in suspended cargo
- Execute sling work thoroughly to prevent lifting-device disconnection during hoisting
- Store wire in a dedicated rack to prevent deformation/breakage
- Station a signalman and use standardized signaling
- Strictly manage overload prevention devices so they always function normally
- Unloading restriction: prohibit unloading at more than 75% of crane capacity
- Check substrate (“house”) and secure bearing capacity using:
- outriggers
- reinforcing support timbers
- compacting the ground
4) Electric shock accidents
How they happen
- Crane contact with high-voltage power lines
Prevention
- Check overhead power lines in advance within the operation area
- For work near charging lines (vehicles/machinery):
- install and maintain proper insulating protective equipment
- maintain at least 3 meters from the charging line
- Station a work area supervisor and signalman
Speakers / sources featured
- No individual speakers are explicitly identified.
- Sources referenced (laws/acts):
- Industrial Safety and Health Act
- Construction Machinery Management Act
- Automobile Management Act
- No organizations or named experts are credited beyond these legal references.