Comprehensive Safety Clearance for Mobile Crane Operations on Unstable Soil

1. Section 1: Job Site Coordinates, Crane Serial & Operator Metadata

Provide comprehensive identification and contact information for the project, equipment, and personnel. All certification documents must be current and uploaded.


Project Name

Project Number

Crane Manufacturer

Crane Model

Crane Serial Number

Crane Manufacturing Year

Maximum Rated Capacity (metric tons)


Maximum Boom Length (meters)

Total Counterweight Installed (tons)


Crane Certification Document

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Certified Crane Operator Full Name

Operator Certification Number

Operator Certification Expiry Date

Years of Crane Operating Experience


Operator License/Certification Document

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Planned Outrigger Setup Date & Time

Site Manager/Supervisor Name

Site Manager Contact Number

Emergency Contact Name

Emergency Contact Number

Current Insurance Certificate

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2. Section 2: Geotechnical Soil Bearing Pressure & Steel Matting Calculations

Complete detailed geotechnical assessment and matting calculations. All values must be verified by a qualified geotechnical engineer. Provide calculations for both un-matted and matted conditions.


Primary Soil Classification

Unconfined Compressive Strength (kPa)

Measured Soil Bearing Capacity (kPa)


Has a geotechnical report been prepared for this site?


Bearing Pressure Calculation Matrix

Load Scenario

Crane Load (tons)

Outrigger Reaction Force (kN)

Outrigger Pad Area (m²)

Calculated Ground Pressure (kPa)

Soil Capacity (kPa)

Within Safe Limits?

Maximum Load - Unmatted
90
850
1.5
567
45
 
Maximum Load - Matted
90
850
9
94
45
Yes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Steel Matting Material Specification

Matting Length (meters)

Matting Width (meters)


Matting Thickness (mm)

Required Matting Overlap (mm)


Total Matting Weight (kg)

Is ground improvement (e.g., soil stabilization, compaction) required?


Applied Safety Factor

Have independent engineering calculations been verified?


3. Section 3: Underground Utility Vault & Sub-Surface Cavity Inspection

Comprehensive utility and cavity inspection is mandatory before outrigger placement. All detection methods must be documented with photographic evidence.


Underground Utility Detection Methods Used

Are current utility maps available and accurate?


Utilities Identified Within 10m Radius of Outrigger Positions


Minimum Clearance Distance to Nearest Utility (meters)

Depth of Nearest Utility Below Grade (meters)

Are any utilities located within the crane's operating radius?


Has Ground Penetrating Radar (GPR) been used to scan for sub-surface cavities?


Any voids, cavities, or undocumented excavations detected?


Utility Inspection Completion Date & Time

Qualified Utility Inspector Name & Credentials

Upload Utility Clearance Permit

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Photo Documentation of Utility Markings at Site

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4. Section 4: Weather Telematics, Wind Speed & Outrigger Leveling Verification

Real-time weather monitoring and precise outrigger leveling are critical for safe crane operations. All measurements must be taken immediately before and during operations.


Current Wind Speed at Ground Level (m/s)

Wind Speed at Maximum Boom Height (m/s)


Wind Direction (cardinal direction)

Gust Factor (maximum recorded)

Is current wind speed within manufacturer's safe operating limits?


Ambient Temperature (°C)

Relative Humidity (%)


Precipitation occurring?


Visibility (meters)

Weather Data Source/Station ID

Outrigger Position & Leveling Verification

Outrigger Position

Distance from Crane Center (m)

Pad Elevation (m)

Level Reading (degrees from horizontal)

Within ±1° Tolerance?

Contact Pressure (kPa)

Photo of Pad Placement

Front Left
6.5
102.3
0.5
Yes
95
 
Front Right
6.5
102.3
0.3
Yes
98
 
Rear Left
6.5
102.3
0.4
Yes
96
 
Rear Right
6.5
102.3
0.6
Yes
94
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Leveling Verification Method

Are all outrigger pads fully bearing on stable ground/matting?


Describe any weather-related restrictions or operational limitations

5. Section 5: Certified Crane Operator & Site Safety Director Joint Sign-Off

Final verification and joint authorization by qualified personnel. All preceding sections must be completed satisfactorily before sign-off.


Pre-Operational Safety Checklist Verification

Not Verified

Verified - Satisfactory

Verified - Requires Attention

N/A

All outriggers properly extended and positioned

Matting correctly sized and positioned under all outriggers

Swing radius barricaded and controlled

Load chart available and appropriate for configuration

Anti-two block system functional

Load moment indicator (LMI) calibrated and functional

Ground conditions stable and verified

All personnel briefed on lift plan

Emergency procedures communicated

Communication devices tested and functional

Has a comprehensive lift plan been developed and reviewed?


Planned Maximum Load for This Setup (tons)

Maximum Load Radius (meters)

Are there any overhead hazards within the work zone?


Designated Emergency Assembly Point

Designated Radio Communication Channel

Have all ground personnel and spotters been briefed?


Special Precautions or Operational Restrictions

Photo Evidence of Completed Outrigger Setup

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Photo of Overall Site Configuration

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Certified Crane Operator Digital Signature

Operator Sign-Off Timestamp

Site Safety Director Digital Signature

Safety Director Sign-Off Timestamp

I confirm that all information provided is accurate and complete to the best of my knowledge, and that crane operations may proceed safely under the conditions specified.

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