Outrigger Bearing — Stiff Clay
Pad pressure vs allowable bearing on stiff clay, with required mat area.
Stiff clay holds 150 kPa on a dry week and a fraction of that after rain — clay's strength is a moisture report, not a property. The classic failure: a crane set on Friday passes; Monday's lift, after weekend rain, punches through. Re-check after every wet spell.
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Pad pressure vs allowable bearing on stiff clay, with required mat area. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Outrigger Bearing — Stiff Clay
Outrigger Bearing — Stiff Clay computes the governing relationship P = (W_crane + W_load) × share ÷ pad area vs q_allow live as you type. Stiff clay holds 150 kPa on a dry week and a fraction of that after rain — clay's strength is a moisture report, not a property. The classic failure: a crane set on Friday passes; Monday's lift, after weekend rain, punches through. Re-check after every wet spell. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Outrigger Bearing — Stiff Clay
- 1Enter your values — Crane weight (with counterweight), Load + rigging, Worst-case share on one pad, Pad/mat contact area and more (sensible defaults are pre-filled).
- 2Read the live results: Pad load, Bearing pressure, Mat area needed.
- 3Check the "with your numbers" line to see P = (W_crane + W_load) × share ÷ pad area vs q_allow substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Outrigger Bearing — Stiff Clay?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula P = (W_crane + W_load) × share ÷ pad area vs q_allow with authoritative sources cited on the page (OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction; FEM 5.016 / Liebherr ground-pressure guidance)
- ✓Stiff clay holds 150 kPa on a dry week and a fraction of that after rain — clay's strength is a moisture report, not a property.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the outrigger bearing — stiff clay use?+
It evaluates P = (W_crane + W_load) × share ÷ pad area vs q_allow, exactly as published. Sources: OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction; FEM 5.016 / Liebherr ground-pressure guidance. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Stiff clay holds 150 kPa on a dry week and a fraction of that after rain — clay's strength is a moisture report, not a property. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Pad pressure vs allowable bearing on stiff clay, with required mat area. A free crane load, wind & rigging safety tool. The classic failure: a crane set on Friday passes; Monday's lift, after weekend rain, punches through. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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