That's a lot of steel! 2

[BCPeng]

There's a project ongoing that requires some very tight reinforcing steel placement.
How would you specify concrete for this job? Is this too tight for even Agilia to flow through?

Why could they not have used larger steel with more reasonable spacing?

 

[dik]

SuperP with sand?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[skeletron]

This IS a job that would definitely require Independent Review of Structural Design as per EGBC.

 

[JLNJ]

Hard work for the craft?

Wouldn't the craft know that if you can't get a pen between the bars then they won't be able to consolidate the concrete?

 

[dik]

EGBC? Engineers and Geoscientists of British Columbia?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Brad805]

So far this looks like a construability issue at the intersections, so I am not sure the independent review would have flagged that unless it was an old dog that was keen. I suspect someone like Harris Rebar detailed, supplied and installed the rebar. They usually flag this type of problem and I would not be shocked if the shop dwg review process missed the problems. The usefulness of shop dwg reviews has really went to the dogs over the years.

EGBC

 

[dik]

Thanks Brad... just took a WAG and was pretty close.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[dik]

I worked for RJC in Toronto for about a decade, after starting out in Winnipeg, and at the time, they were one of the best concrete engineers in Canada... I suspect they are still top drawer. This kaka would not have come out of their office.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[structuralCADspecialist]

I worked for RJC in Toronto for about a decade, after starting out in Winnipeg, and at the time, they were one of the best concrete engineers in Canada... I suspect they are still top drawer. This kaka would not have come out of their office.

RJC was "better" than many of the other firms in my opinion. But some of their latest drawings aren't looking to great. Their general notes and details have even degraded somehow... I don't know why they just don't retain what they had on older drawings. RJC is said to be the ones who pioneered the 2-way flat slabs we typically see in the residential sector. They didn't do a good job of protecting their intellectual property as many people who left RJC continued to create drawing sets using RJC's details and CAD standards (whether either would be protected under their property rights I have not a clue). Talk around town is that one firm that was started by ex RJC employees was the one that really started the trend of underbidding other firms for work. That same firm was later busted for not conducting a proper internal peer review... go figure... Anyways, when dealing with residential/commercial reinforced concrete projects I would prefer RJC over my area's other firms. The best firms however tend to veer away from commercial/residential and usually work on institutional stuff.

Reading through Acciona's site it appears that they act like a design-build construction manager. It's so hard to really get a firm grasp of what they actually do (their focus seems really divided).

The most visible participant from the consulting side is Dialog:

https://www.dialogdesign.ca/our-work/projects/north-shore-wastewater-treatment-plant/

Years back Dialog bought out a structural engineering firm named Jones Kwon Kishi, who I think had a pretty good reputation (I've never encountered their work so can't say for sure). That may be a moot point however as there's a strong chance yet another structural designer is in charge of whatever this giant wall is, along with any of the large water retaining structures. The scale of these is a lot bigger than Dialog's typical projects; they seem to specialize in smaller more eccentric structures. I also know that they often hire external structural engineers to design some of their multi-residential projects. Ironically, one of the structural engineers they used to use was the same one whose design they performed an independent review of; this being part of an investigation into a faulty design of a residential tower (the same incident which lacked a proper peer review mentioned above). Their report seemed very well prepared compared to the reports of those with contrary arguments.

 

[dik]

Property rights weren't a big consideration back then... it was just engineering. Per Christoffersen was the one responsible for the modelling for slab design.
They used to have the plastic model that was used for his initial testing in the Toronto office. I still have scans of their standard details from 40 years back. I knew Peter Jones and Dick Kishi well; I don't recall ever meeting Kwon How Kwon(g)?.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[structuralCADspecialist]

Per Christoffersen was the one responsible for the modelling for slab design.
They used to have the plastic model that was used for his initial testing in the Toronto office

Builders also preferred their way of doing things as well. They intentionally designed their top mats in a way that allowed them to easily be lifted into place. Staggering bars also provided better crack control (so I'm told by a pretty smart detailer - but that's over my head... probably a good future topic). They even invested a lot of effort into researching longevity. They were really in tune with the industry. I would be thrilled just to have plans that were as good at theirs's were 20 years ago.

 

[BAretired]

One of the main changes in the early days of flat slabs and flat plates was to get rid of the bent bars (which may have saved a little rebar, but were a bear to place) and substitute separate top and bottom mats.

BA

 

[dik]

Staggered T&B bars from decades back... maintains continuity of rebar... used for many parkades...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik