Structural design and certification of transport frames
Structural design and certification of transport frames and supports for moving large fabricated items safely by road.
Fig. 1 · Welding a steel frame
- 1Weld. Weld procedures set out on the drawings
- 2Steel frame. Designed and checked for transport loads
compliant and verified for road movement
engineered for the real loads, not over-built
fabrication drawings delivered to schedule
The challenge
Large fabricated items commonly need to move by road between the workshop and site, and the frames that carry them are often built from precedent or judgement rather than analysis. Frames built this way are either heavier and more expensive than they need to be, or carry loads nobody has verified.
Road movement brings compliance obligations and real consequences if a support fails in transit. Project and logistics personnel require frames that are engineered for the actual loads, certified against the relevant standards, and sized so the transport task stays practical and economic.
When it's time to act
The signs we commonly see when this initiative is due.
- Frames built from judgement carrying loads nobody has verified.
- Steel over-built by caution, adding weight and cost to every movement.
- A transport task waiting on certification nobody planned for.
- Lift points and restraint arrangements decided at the workshop door.
- A frame reused for a different item because it looks strong enough.
How we deliver it
Define the duty
Item mass, centre of gravity, lift points and the transport and route requirements.
Load cases
Transport accelerations, lifting and restraint cases that the frame has to carry.
Design
Size the frame and supports to the loads, without over-building the steel.
Verify
Structural analysis against the applicable standards, with FEA where the detail warrants it.
Certify
Certification plus fabrication-ready drawings the workshop can build from.
Define the duty
Item mass, centre of gravity, lift points and the transport and route requirements.
Load cases
Transport accelerations, lifting and restraint cases that the frame has to carry.
Design
Size the frame and supports to the loads, without over-building the steel.
Verify
Structural analysis against the applicable standards, with FEA where the detail warrants it.
Certify
Certification plus fabrication-ready drawings the workshop can build from.
Our approach
- Understand the transport task and its constraints: the item, the route, the lifting arrangements and the compliance obligations that apply.
- Assess the loads and transport requirements for each item against your engineering standards and the relevant structural and road transport codes.
- Design frames and supports to suit, backed by structural analysis and FEA where the detail warrants it.
- Certify the designs against the applicable standards.
- Deliver drawings ready for fabrication.
Tools and methods
The value it creates
- Certified, compliant transport frames for safe road movement.
- Designs sized to the job rather than over-built.
- Fabrication-ready drawings delivered to schedule.
What changes
Designed by precedent
Sized to the real loads, route and restraint
Unverified capacity
Analysis and certification to the applicable standards
Over-built steel
Frames economic to fabricate and practical to move
Engineering at the last minute
Fabrication-ready drawings delivered to schedule
Where these initiatives fail
The failure modes we design against.
- Guessing the centre of gravity, which invalidates every load case downstream.
- Designing for the static load and forgetting transport accelerations and restraint.
- Reusing a frame outside the duty it was certified for.
- Leaving certification to the end, where it becomes the critical path.
Common questions
What information is needed to start?
The item's mass, geometry and centre of gravity, the lift and restraint arrangements, and the route and transport requirements. Where the centre of gravity is uncertain we calculate it from the model rather than assume it.
Are the frames reusable?
Within their certified duty, yes, and that duty is documented. A frame is certified for defined loads and restraint arrangements, not for whatever fits on it next.
When is FEA used?
Where the detail warrants it: complex connections, stress concentrations and anything hand calculations cannot honestly resolve. Simple members are verified against the code without the overhead.
Key terms
Plain-language definitions from our glossary for the concepts this page leans on.
Further reading
Articles and calculators on the methods behind this work.
- Bolt torque and bolted joints: preload, where the torque goes, an indicative torque table, tightening methods, and why joints come loose (article)
- Tender documents and the tender process: what goes in a request for tender, what tenderers return, evaluation criteria, and what causes trouble later (article)
- Writing a technical specification: how open to make it, its sections, the parts of a good requirement, and the maintenance requirements usually missed (article)
- Engineering study phases: scoping, prefeasibility, feasibility and FEED, the gates between them, and the design reviews that catch problems early (article)
- Bulk materials handling: specifying a conveyor or chute so the design holds up (article)
- Stacker reclaimers: the machine types, stacking methods and blending, the systems on each machine and how they fail, and structural integrity (article)
Related projects
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