Sheepscot Turntable - Official Work Thread

[Paul Uhland]

Great pics.
Thanks.

[Paul Uhland]

Will the excavated soil be used as fill, say, at the first mainline washout north of TOM?

[Jason M Lamontagne]

No, it's being removed.  It's pretty junky stuff.

See ya
Jason

[Paul Uhland]

Too bad.

[Mike Fox]

It would make good fill where compaction wasn't an issue. Not under a building or roadbed. Going to try and use similar material in those critical areas.

[Mike Fox]

Noticed the clay tiles are still being used to support the rebar cage. These should be removed before the pour, or a void could be created, creating a weak spot in the footer. Use of rebar as a support would be much better strength wise, by driving them in as stakes and tying the rebar cages to them, or use solid bricks.

[Paul Uhland]

Mike...As former rebar detailer, special metal spacer 'chairs' are made for rebar to sit on , especially in slabs.
Definitely pull out those hollow pipe tiles, replace with at least 2" thick solid bricks to keep rebar up inside the concrete to properly reinforce and help keep it consolidated if cracking occurs.

Um...finally read a note on the rebar placement plan: minimum coverage--3 inches.
So there. 

[Terry Harper]

The rule I was taught regarding rebar cover was the rebar should be a min. of 3" from the bottom of the slab/footing
and Min. 1-1/2" in from the sides and top.

I love watching WW&F projects progress. You folks simply know how to get it done and get it done right.

[Paul Uhland]

Terry...sounds good to me.

[Dave Crow]

American Concrete Institute (ACI) specifies 3" minimum cover to protect the rebar from water seeping in and corroding the rebar.  Any seams between concrete pours, such as between the footer and the center pedestal, are supposed to be sealed with a concrete bonding agent.

Dave Crow

[Brendan Barry]

The footing was poured this afternoon.

[Jeff Schumaker]

Fantastic progress. So, what is the next step?

Jeff S.

[Stewart "Start" Rhine]

Build the next set of forms for the next pour.  The panels for the forms have been built, they will be set up and secured around the next stage of rebar.

[Paul Uhland]

Will the thick ring stem wall be cast as a one-piece, solid unit?
Will more rebar be added?
Am assuming the turntable will be assembled in place when enough prelim work is done?
When is the next pour? IIRC, I've learned generic concrete takes 3 days to reach 50% strength, 90% in 28 days.

Love 'snoopervising' this fascinating project.  

[Mike Fox]

Paul,
The rebar that is laying at the end of track, just beyond the tie, is for the retaining wall for the TT lead, and 3 roundhouse tracks. Also, I think there was some to go across the length of the fingers.