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Crane mats on solid ground feel like overkill to me now.
I was at a job site last week where we had to set up on compacted soil. The foreman insisted on mats, but it added an hour to the setup for no clear gain. Do you guys ever skip mats when the ground seems solid?
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christopher_west7mo ago
Man, xena's point about water is huge... it's never just about the dirt under the feet. Water moves sideways, you know? I've seen a setup on bone-dry clay that turned to soup three feet over because of a buried utility trench backfilled with sand. That sand acted like a pipe for rain a whole block away. The mat didn't just spread weight, it bridged that weak spot we couldn't even see. That extra hour feels long until you need a week to pull a crane out of a hole.
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the_matthew7mo ago
Seriously, that extra setup time kills me too. I've seen guys skip mats on what looked like perfect compacted gravel, only to have a leg punch in a few inches after a full lift. It's never about how it looks before, it's about the insane point load when you're fully rigged. Not worth the risk of a shut down lol.
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xena_king227mo ago
On a bridge job in Ohio, our crew once trusted what seemed like firm clay. Matthew's point about point load is spot on, but we learned the hard way that subsurface water flow can undermine everything. We had a 300-ton crane settle unevenly during a critical pick, not from the lift weight, but from a hidden spring we didn't map. Now we always do a quick probe test with a rod before committing to a setup. That extra ten minutes beats a full day of recovery work.
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jade_murray7mo ago
Yikes, @xena_king22's story about the hidden spring is wild. That probe test sounds smart but how often does that actually find a real problem? Like, do you guys hit something sketchy often enough that the ten minutes is a no-brainer, or is it mostly just checking a box? I'd hate to be the guy who skipped the step and found the one underground river in the whole county.
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