Outrigger Bearing — Near-Excavation Setup
Pad pressure vs allowable bearing on near-excavation setup, with required mat area.
Surcharge near a cut loads the failure wedge directly: the rule of thumb keeps the outrigger back one metre per metre of depth (1:1) in firm soil, double in soft. This variant derates bearing to reflect wedge proximity — but geometry, not pressure, is the real check: measure the setback first.
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.
Disclaimer: This tool is for general informational and estimation purposes only and is not professional financial, tax, accounting or legal advice. All figures are estimates — verify with a qualified professional before making decisions. Read the full disclaimer.
Pad pressure vs allowable bearing on near-excavation setup, 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 — Near-Excavation Setup
Outrigger Bearing — Near-Excavation Setup computes the governing relationship P = (W_crane + W_load) × share ÷ pad area vs q_allow live as you type. Surcharge near a cut loads the failure wedge directly: the rule of thumb keeps the outrigger back one metre per metre of depth (1:1) in firm soil, double in soft. This variant derates bearing to reflect wedge proximity — but geometry, not pressure, is the real check: measure the setback first. 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 — Near-Excavation Setup
- 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 — Near-Excavation Setup?
- ✓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)
- ✓Surcharge near a cut loads the failure wedge directly: the rule of thumb keeps the outrigger back one metre per metre of depth (1:1) in firm soil, double in soft.
- ✓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 — near-excavation setup 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?+
Surcharge near a cut loads the failure wedge directly: the rule of thumb keeps the outrigger back one metre per metre of depth (1:1) in firm soil, double in soft. 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 near-excavation setup, with required mat area. A free crane load, wind & rigging safety tool. This variant derates bearing to reflect wedge proximity — but geometry, not pressure, is the real check: measure the setback first. 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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