Mechanics Of A Super Lift - Map Your Sho Me… · Mechanics Of A Super Lift ALE 5000-Ton Crane...
Transcript of Mechanics Of A Super Lift - Map Your Sho Me… · Mechanics Of A Super Lift ALE 5000-Ton Crane...
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Mechanics Of A Super Lift
ALE 5000-Ton Crane – World Record Lift of Six
Derricks – Lifted Weight 1.627 tons @ 174 feet radius
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Introduction
JOSEPH S. COLLINS
Joseph (Joe) Collins is the Heavy Lift Manager for Becht
Engineering Co., Inc. He is providing Consulting and Design
Services for Lifting and Transport of process equipment,
machinery, chemical, refining and nuclear vessels and
components.
His duties include consulting to clients using the world’s
largest cranes and super heavy lift projects. In addition, he is
assisting major companies in updating their crane and
rigging policies to assure compliance with the new OSHA
crane rule.
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Introduction
Collins has over 40 years experience in Heavy Industrial
Construction, specializing in Critical Lift Planning and
Execution, based on his long-term career with Zachry
Construction Corporation (ZCC).
He currently serves as Vice President of the Board of
Directors for the National Commission for the Certification
of Crane Operators (NCCCO).
Mr. Collins served as a member of the Cranes and Derrick
Advisory Committee (C-DAC) to OSHA, which wrote and
delivered the current draft of the new OSHA Crane Safety
Standard.
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Definition of a Super Lift
There is no definition for a Super Lift in any current
Standard.
However, many companies that make extreme lifts
within their facilities have coined the term and
created their own definitions.
The intent is to minimize risk by requiring a
comprehensive engineered lift plan followed by a
third party review of the plan.
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Definition of a Super Lift
The definitions vary between companies but all are
intended to achieve the same result.
This system of checks and balances has proven
value and has resulted in the safe lifting of
massive objects worldwide.
An accident with these heavy loads and giant
cranes would be catastrophic both to human life
and the facilities.
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Definition of a Super Lift
Some criteria in the definitions are:
• Lifting with a crane rated at 1000-Ton Capacity
or higher
• Lifting with a crane equipped with capacity
enhancing attachments
• Any lift that presents a risk of catastrophic
damage to human life or the facility
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Presentation Outline
• Ground Bearing Pressure
• Crane Suitability
• Rigging Assemblies
• Lift Procedures
• Personnel Qualifications
• Heavy Lift Manuel
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Ground Bearing Pressure and
Load Distribution Analysis
• Soil Analysis
• Load Distribution Systems (foundations)
• Underground Structures and Cavities
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Ground Bearing Pressure and
Load Distribution Analysis
Soil Analysis
– The allowable ground bearing capacity has to be
investigated and confirmed by an experienced
soils engineering firm.
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Sample Soil Report
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Sample Soil Report
The site surface cover generally consisted of gravel. The soil profile generally
consisted of lean clay with varying amounts of sand to depths of about 13.5 feet
underlain by fine to medium sand to below the boring termination depths.
Groundwater was encountered at depths of 13.5 feet in the test boring at the time
of field exploration.
Based on the subsurface conditions encountered and expected loads, shallow
foundations could be used to support the proposed structures. Foundation
design recommendations for the proposed structures are presented in the
following table.
DESCRIPTION VALUE
Foundation Type Shallow foundation
Bearing Material 6 inches of ODOT Type “A” crushed aggregate base2,3 over undisturbed native
soil
Net Allowable Bearing Pressure1
2,500 psf
Total Estimated Settlement 1 inch
Estimated Differential Settlement Approximately 1/2 of total settlement
1. The recommended net allowable bearing pressure is the pressure at the base of the
shallow foundation in excess of the adjacent overburden pressure. Assumes any
unsuitable materials, if encountered, will be undercut and replaced with engineered fill.
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Ground Bearing Pressure and
Load Distribution Analysis
• Foundations
– Depending on the type of lift equipment, cranes
or gantry systems, the foundation is designed
based on the allowable ground pressure.
– The foundations may consist of:
• piling with a concrete cap
• wood and or steel crane mats
• compacted fill
• all of the above
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Sample Ground Bearing Pressures
• Terex CC6800 – 1200-Ton Capacity
– GBP = 12,700 psf
• Liebherr LTM 11200 – 1200-Ton Capacity
– single outrigger force 418,000 lbs.
• Mammoet PTC Ringer – 3500-Ton Capacity
– GBP = 3,400 psf
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2000-ton Gantry System (Mammoet)
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Sample Foundation Design
with Piles and Concrete Cap
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Sample Foundation Design
with Piles and Concrete Cap
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Piling Installation
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3500-Ton Ring Crane (Mammoet)
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Sample Foundation Design
3500 psf
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Foundation Design 3-D Model
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Sample Ground Pressure Calculation
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Underground Structures
A thorough investigation must be done to identify
underground structures or buried cavities under or
near the crane foundation.
Some good sources are:
• Site Owner records and drawings
• Sounding with sonar equipment
• These hazards are some times exposed during
excavation while improving the ground for the
crane foundation
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Proof Test the Foundation
Becht Engineering highly recommends proof
testing the foundation
• Static Test – Load the foundation with enough
weight to simulate the ground bearing pressure
the crane will apply.
– This can be done with the crane counterweights
– Measure the foundation elevation before, during
and after the load is applied
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Proof Test the Foundation
• Static Test the Foundation
– Select a test weight that, at a given boom angle,
will simulate the ground bearing pressure applied
by the crane
– The test weight only needs to be raised until it is
freely suspended
– Measure the the foundation elevation before,
during and after the test lift is conducted
Any settlement more than the engineered allowable
is unacceptable and the foundation must be
modified
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Foundation Failure
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Crane Suitability
• Crane capacity and proper configuration
• Assembly and Disassembly Procedures
• Inspection Records
• Maintenance Records
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ALE 5000-Ton Crane
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Crane Capacity
and Proper Configuration
The new cranes with super lift counterweights are
often misunderstood by the lay person.
They have to achieve somewhere between 80 and
90 percent of capacity to float the auxiliary
counterweight.
For some time now, the facility owners wanted to
limit lifts to 75 percent of capacity. This is a good
idea for conventional cranes but does not
necessarily work for super lift cranes.
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Crane Capacity
and Proper Configuration
Selection of the right crane and attachments is
critical.
• The super cranes have a large foot print and
adequate room is required
• Erecting the boom is a major consideration as
they can be 400 plus feet long
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Crane Capacity
and Proper Configuration
TC 36000 – 2500-Ton VersaCrane
Deep South Crane and Rigging
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Inspection Records
Review the inspection records of the crane
• Look for recurring problems that have been
addressed multiple times
• Use this information to zoom in on problem
areas while the crane is being erected and
during the final inspection
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Maintenance Records
Review the maintenance records of the crane
• Look for recurring problems that have been
addressed multiple times
• Use this information to assure a specific spare
parts are on hand
• Assure commonly used spare parts are on hand
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Rigging Assemblies
• Check Rigging Configurations for Capacity
• Analyze Rigging Configuration for Stability
• Analyze Below the Hook Lifting Devices
• Analyze Points of Attachment
• Assure Compliance with Current Regulations
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2000-Ton Capacity Rigging System
(Versabar)
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Rigging System (Versabar)
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Rigging Detail (Holloway Houston)
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Proof Testing 1500-Ton Lifting Lug (Holloway Houston)
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Proof Testing 1500-Ton Lifting Lug
(Holloway Houston)
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Compliance with Current Standards
• OSHA 1926.1400
Subpart CC
– Cranes and Derricks in
Construction
• ASME BTH-1
– Design of Below-the-
Hook Lifting Devices
• ASME B30.5
– Mobile and Locomotive
Cranes
• ASME B30.9
– Slings
• ASME B30.10
– Hooks
• ASME B30.20
– Below- the –Hook
Lifting Devices
• ASME B30.26
– Rigging Hardware
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Lift Procedures
• Check All Clearances
• Confirm all Radii are Within Crane Capacity
• Confirm Safe Wind Speed Limits
• Confirm that Rigging Personnel can Safely
Attach the Rigging, Land the Load and
Disconnect the Rigging
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Check All Clearances
During the planning phase, check clearances for:
• Load to Boom
• Load to Obstructions
• Boom to Obstructions
• Remaining Head Room
• Counterweight to Obstructions
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Check All ClearancesMammoet PTC 3500-Ton
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Check All ClearancesMammoet PTC 3500-Ton
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Check All ClearancesMammoet PTC 3500-Ton
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Check All Clearances
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Check All Clearances
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Check All Clearances
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Confirm all Radii are
Within Crane Capacity
Physically measure all radii in the field
• A tape measure is not much use due to
obstructions
• Seek assistance from experienced field
surveyors
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Confirm Safe Wind Speed Limits
Wind Is Your Worst Enemy
• Refer to the crane manufacturers wind limit
instructions
• Calculate the wind sail area of the load
• Determine what wind speed will move the load
Set the wind speed limit to the lower value
Keep in mind that even if the crane can safely lift
the load, the riggers may not be able to safely
control and/or land the load.
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Confirm Personnel Safety
Confirm that Rigging Personnel can Safely Attach
the Rigging, Land the Load and Disconnect the
Rigging
• Is scaffolding needed and will it be erected for
the riggers to work from?
• Will the scaffolding obstruct the load path?
• Will a crane suspended personnel platform be
required to disconnect the rigging?
These considerations have to be included in the
plan
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Sample Scaffolding
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Confirm Personnel Qualifications
• Review and Confirm the Crane Operator
Qualifications/Certifications
• Review and Confirm the Lift Director
Qualifications
• Review and Confirm the Rigging Crew
Qualifications
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Heavy Lift Manual
• Prepare a Comprehensive Lift
Manuel containing al relevant
support documents pertaining
to the lift plan
• The manual will be a living
document and will be modified
as minor revisions are made to
the overall plan.
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Heavy Lift Manual
The Heavy Lift Manual is intended to serve as a
resource for all parties with responsibilities
regarding the lift.
It eliminates errors by having everyone working
from the same play book.
It serves as a legal document defendable in a
Court of Law.
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Heavy Lift Manual
Sample Table of Contents
• Administration Documents
– Contractor Organizational Charts and Responsibilities
• Civil Engineering
– Geotechnical Report
– Site Survey
– Underground Structures
– Crane Foundation Drawings with Engineering Calculations
• Rigging Engineering
– Rigging Diagrams, Load Calculations, Lift Plans
– Rigging Certifications
– Wind Speed Limits
– Points Of Attachment Design Calculations and NDT Reports
– Test Lift Plan
– Personnel Lift Plan
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Heavy Lift Manual
Sample Table of Contents
• Crane Assembly/Disassembly Procedures
– Crane Manufacturers Detailed Assembly Instructions
– Detailed Erection Procedure Including Elevation and
Plan View Drawings
– A/D Checklist
– A/D Critical/Engineered Lifts
– Assembly Crane Configuration, Capacity Charts and
GBP Calculations
– Assembly Crane GBP Mitigation Plans
– Rigging Certifications
– Plan for Personnel to Access Elevated Work
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Heavy Lift Manual
Sample Table of Contents
• Crane Inspection Records
– Annual Inspections Records
– Frequent Inspection Records (pre-shift and or daily)
– A/D Inspection Records
– Wire Rope Inspection Records
– Boom Pendent Strap Inspection Records
– Maintenance Records
• Repair Summery
• Spare Parts List (strongly advised)
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Heavy Lift Manual
Sample Table of Contents
• Safety Execution Plan
• Population Control Plan
• Risk Assessment, Controls & Mitigations
• Contingency Plans
• Emergency Procedures
• Incident Notification Plan
• Permits
• Lessons Learned
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Third Party Review
Engineering Review
A formal engineering is highly recommended.
In the coarse of our reviews, we often discover and
correct small mistakes in the engineering plans.
It is important to remember that most crane
accidents are not the result of a single mistake but
are the combination of several factors that come
together at one time.
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Third Party Review
The third party engineering review not
only eliminates mistakes but it also
validates the lift plan in the event it has
to be defended in court.
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Third Party Field Monitoring
We also highly recommend that you have the
third party monitor the crane erection and lifts.
This is to assure the plan is followed accordingly
and the inevitable field changes to the plan are
properly managed.
Often we find the rigging crew is so busy with
their work that they can easily miss a step, permit
or simply select the wrong sling or shackle from a
pile of rigging.
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Thank You