Re: [MBZ] OT - Concrete Slab Construction

Channels for post-tensioning cast slabs. ___ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com

Re: [MBZ] OT - Concrete Slab Construction

Oops, they're having trouble taking the top off the crane. While they're working on that, we'll go ahead and take the pins out of the middle of the crane to save time... https://www.youtube.com/watch?v=te547Ek0yJo https://www.youtube.com/watch?v=2AilIZ6FR8w

Re: [MBZ] OT - Concrete Slab Construction

> On October 31, 2019 at 4:51 PM Randy Bennell via Mercedes > wrote: > > > https://www.youtube.com/watch?v=hBjntrebxj8 > > An explanation of the design and failure. A different sort of failure: https://www.youtube.com/watch?v=eLS-gPu656M Analysis:

Re: [MBZ] OT - Concrete Slab Construction

"We the incompetent, led by the blind..." Plenty of blame to slather around. Randy Bennell via Mercedes wrote on 10/31/19 3:47 PM: Design failure mostly. "An examination carried out by theFederal Highway Administration discovered

Re: [MBZ] OT - Concrete Slab Construction

https://www.youtube.com/watch?v=hBjntrebxj8 An explanation of the design and failure. Randy On 31/10/2019 3:42 PM, G Mann via Mercedes wrote: I believe I recall the postmortem on the event found a combination of lack of spec post tension and failure to allow proper cure time for the concrete.

Re: [MBZ] OT - Concrete Slab Construction

It collapsed during a post-tensioning operation, but the cause was an error by the engineering firm that designed it. MG via Mercedes writes: > I believe it was incorrect tension. > > OK Don via Mercedes wrote: >> The presence, or lack of them caused the collapse? >> >> On Thu, Oct 31, 2019

Re: [MBZ] OT - Concrete Slab Construction

Design failure mostly. "An examination carried out by theFederal Highway Administration discovered faults in the design of the bridge, which overestimated the strength of the bridge in the region which failed, and underestimated

Re: [MBZ] OT - Concrete Slab Construction

I believe I recall the postmortem on the event found a combination of lack of spec post tension and failure to allow proper cure time for the concrete. Do not recall for sure, but my memory says, concrete was also sub spec for strength in the mix. Rush job, with failure on film as I recall.. On

Re: [MBZ] OT - Concrete Slab Construction

I believe it was incorrect tension. OK Don via Mercedes wrote: The presence, or lack of them caused the collapse? On Thu, Oct 31, 2019 at 2:01 PM Randy Bennell via Mercedes < mercedes@okiebenz.com> wrote: Post tensioning cables. -D Is that not what caused the problem with that pedestrian

Re: [MBZ] OT - Concrete Slab Construction

The presence, or lack of them caused the collapse? On Thu, Oct 31, 2019 at 2:01 PM Randy Bennell via Mercedes < mercedes@okiebenz.com> wrote: > > > Post tensioning cables. > > > > -D > > Is that not what caused the problem with that pedestrian bridge to some > university down your way, that

Re: [MBZ] OT - Concrete Slab Construction

On Thu, 31 Oct 2019 14:00:29 -0500 Randy Bennell via Mercedes wrote: > On 31/10/2019 1:48 PM, Dan--- via Mercedes wrote: > > Figured it out after our afternoon walk: > > > > Post tensioning cables. > > > > -D > > Is that not what caused the problem with that pedestrian bridge to some >

Re: [MBZ] OT - Concrete Slab Construction

Ahh, you beat me to it... -Curt On Thursday, October 31, 2019, 3:01:23 PM EDT, Randy Bennell via Mercedes wrote: On 31/10/2019 1:48 PM, Dan--- via Mercedes wrote: > Figured it out after our afternoon walk: > > Post tensioning cables. > > -D Is that not what caused the problem with

Re: [MBZ] OT - Concrete Slab Construction

On 31/10/2019 1:48 PM, Dan--- via Mercedes wrote: Figured it out after our afternoon walk: Post tensioning cables. -D Is that not what caused the problem with that pedestrian bridge to some university down your way, that collapsed? Randy ___

Re: [MBZ] OT - Concrete Slab Construction

Figured it out after our afternoon walk: Post tensioning cables. -D > On Oct 31, 2019, at 1:13 PM, Dan--- via Mercedes > wrote: > > They’re now two floors up and there’s no sidewalk on that side of the street, > so we can’t ask. Otherwise we would. > > Not the top floor - second floor of

Re: [MBZ] OT - Concrete Slab Construction

They’re now two floors up and there’s no sidewalk on that side of the street, so we can’t ask. Otherwise we would. Not the top floor - second floor of 18, I believe. -D > On Oct 31, 2019, at 12:25 PM, MG via Mercedes wrote: > > If it's the top floor of the parking deck then it might be for

Re: [MBZ] OT - Concrete Slab Construction

If it's the top floor of the parking deck then it might be for solar hot water heating. MG Dan--- via Mercedes wrote: Nope. If you closely, you can see the conduit (gray) run across the deck as well. Note that it’s spaced pretty evenly in one direction, but the ones that cross at 90

Re: [MBZ] OT - Concrete Slab Construction

I'm no expert but in the all the construction I've seen, all plumbing for sprinklers, domestic water, and sewer is installed below the slab. My thought was that it's for cooling the poured concrete to get a slower/stronger cure. I agree -- ask someone on the site. Allan Floyd Thursby via

Re: [MBZ] OT - Concrete Slab Construction

What is below the deck?  Might be for sprinklers? Go down and ask them! --FT On 10/31/19 11:00 AM, Dan--- via Mercedes wrote: Nope. If you closely, you can see the conduit (gray) run across the deck as well. Note that it’s spaced pretty evenly in one direction, but the ones that cross at

Re: [MBZ] OT - Concrete Slab Construction

Nope. If you closely, you can see the conduit (gray) run across the deck as well. Note that it’s spaced pretty evenly in one direction, but the ones that cross at 90 degrees are grouped closely together. It’s a mystery to us... -D > On Oct 31, 2019, at 10:57 AM, Floyd Thursby via Mercedes >

Re: [MBZ] OT - Concrete Slab Construction

Conduit for cables? --FT On 10/31/19 10:48 AM, Dan--- via Mercedes wrote: Here’s a better picture now that it’s out of the shade. On Oct 31, 2019, at 10:38 AM, Dan--- via Mercedes wrote: Nope. If you look closely, it’s not a loop or interconnected. The tubing is laid out in straight

Re: [MBZ] OT - Concrete Slab Construction

Cooling? Run the AC into the floor of the parking structure? -Curt On Thursday, October 31, 2019, 10:44:55 AM EDT, Curley McLain via Mercedes wrote: They could be doing an exposed manifold  at the ends. Dan--- via Mercedes wrote on 10/31/19 9:38 AM: > Nope. If you look closely, it’s

Re: [MBZ] OT - Concrete Slab Construction

They could be doing an exposed manifold  at the ends. Dan--- via Mercedes wrote on 10/31/19 9:38 AM: Nope. If you look closely, it’s not a loop or interconnected. The tubing is laid out in straight lines and in a grid arrangement, but it just ends up at the edge of the slab. No need for

Re: [MBZ] OT - Concrete Slab Construction

Nope. If you look closely, it’s not a loop or interconnected. The tubing is laid out in straight lines and in a grid arrangement, but it just ends up at the edge of the slab. No need for floor heating in Florida. And the deck you see in the picture is for a parking garage. -D > On Oct 31,

Re: [MBZ] OT - Concrete Slab Construction

Probably heating tubes --FT On 10/31/19 10:18 AM, Dan--- via Mercedes wrote: We’re puzzled by the red tubing that's being laid in the concrete floors of a high rise building being built in the next block. It’s clearly flexible, doesn’t appear to be interconnected as if it would be passing