Vibration next to fresh concrete 1

[JKJohn]

Three separate foundation systems. All are in the same job site and all are delegate design. There are Underpinning, Auger Cast Piles, and concrete driven piles.
We initially had the driven piles go in first, then underpinning, then auger piles.
We had delays and at this point we are going to have to do all three almost at the same time.
Soil on site is soft.
We asked the auger pile concrete when we could drive the concrete pile next to their piles, they answered after one day.
I am not convinced.
I would like to know your thoughts and does anyone have any reference?
Thanks in advance!!

 

[jayrod12]

My answer if asked the same question would be delay the auger casting until the driven piling is complete.

If forced, at 1-2 days the concrete likely will have sufficiently hardened. but I'd still be leery of performing driven piling directly adjacent to newly cast piles.

 

[SlideRuleEra]

Agree with the Contractor, see Ron's answer in this Engineering-Tips thread: Link

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[JKJohn]

Thanks all. To be honest, I am surprised. Then why don't we allow compaction (vibration) next to newly casted walls. Are these two different issues?

 

[SlideRuleEra]

Seanan - If you are asking about compaction behind a newly placed retaining wall, IMHO, that is a different issue. A retaining wall is self-supporting and has to resist the soil load plus the compaction loading applied to the backfill. There is nothing to keep an uninformed Contractor from compacting too close to the wall.

A new cast-in-place concrete piling has no load applied and is supported, surrounded, and protected by soil.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[JKJohn]

SlideRuleEra Thanks a lot. It makes sense.

 

[Ron]

Seanan....pretty much everything SRE says makes sense!!