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Those are tie down straps used to prevent stuff from falling off of trucks.

Things like trench boxes, shoring, trench shoring, trench shields, meteorite shelters, guillotines, caissons, etc.

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Originally posted by PASig:
Is that also known as a caisson?

No.

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In geotechnical engineering, a caisson is a watertight retaining structure used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair of ships. These are constructed such that the water can be pumped out, keeping the working environment dry.

And, of course, an archaic usage is for a chest or wagon for holding or conveying ammunition. ("And those caissons go rolling along....")

flashguy

quote:
In geotechnical engineering, a caisson is a watertight retaining structure used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair of ships. These are constructed such that the water can be pumped out, keeping the working environment dry. End quote:


Also, a caisson is a form of foundation. First a shaft is drilled into the ground, then reinforcing is inserted into the hole and then filled with concrete. Imaging a light pole base but 20 to 100 feet imbedded into the ground.

Thigh-master for those really big girls...

Gynecologist use those. not sure what for though.

Waffle maker, really big waffles.

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Originally posted by ugeesta:
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Also, a caisson is a form of foundation. First a shaft is drilled into the ground, then reinforcing is inserted into the hole and then filled with concrete. Imaging a light pole base but 20 to 100 feet imbedded into the ground.

You are correct that the foundation you are describing is commonly called a caisson, but that is an incorrect designation. It is properly called a drilled shaft foundation. However, it is so commonly called a caisson that the difference has lost all distinction outside of geotechnical engineering circles. Much like magazine and clip.

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Originally posted by XLT:
Gynecologist use those. not sure what for though.

rosie o donnell

A trench box is required by OSHA any time you excavate deeper than 5'.

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Originally posted by rtquig:
A trench box is required by OSHA any time you excavate deeper than 5'.

You can slope walls, in some cases.

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Originally posted by Opus Dei:

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Originally posted by rtquig:
A trench box is required by OSHA any time you excavate deeper than 5'.

You can slope walls, in some cases.

True, but as you get deeper, the slope is so wide it is not practicable .

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Originally posted by rtquig:
A trench box is required by OSHA any time you excavate deeper than 5'.

We put this in to the water main 7' deep. Most mains in Philly are 4.5' so little to no shoring. Curb vents, I remember one 13.5' deep. My buddy said if the hole collapsed, we'd find him at the bottom with his mouth pressed against the sewer, breathing its fetid air.