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Posted on 8/16/19 at 8:22 am to MrLSU
quote:
Spann admitted the soil has already subsided anywhere from 6-to-10 inches in spots underneath the terminal.
I'm going to sound very stupid here, but I can't think of a better way to say it.
Is the building too "heavy"? This is a massive building, given the specific location, is it just too heavy for the land? I would presume the land at that location wasn't sinking at a rate of 2-3 inches per year before construction.
Posted on 8/16/19 at 8:34 am to LSUFanHouston
quote:
Is the building too "heavy"? This is a massive building, given the specific location, is it just too heavy for the land? I would presume the land at that location wasn't sinking at a rate of 2-3 inches per year before construction.
Naw baw. It’s supposed to do that. I know that’s counter intuitive, but it’s the reality of building in SELA. The way foundations are designed in a pile supported slab, you could completely remove the dirt subgrade and it would not affect the structural integrity of the foundation.
Soils here are fascinating. They swell and subside. And there literally is no bottom. When you drive piles in most places you’re driving to bedrock or a more substantial soil base. Here, you’re driving to blow counts, ie I’m driving until it takes 5 blows to move one foot. There is no bottom. It’s all friction
I’ve seen some crazy stuff over the years. Like when you stand a pile up and lower the hammer on it and the weight of the hammer pushes 30’ of pile into the ground like a fork in a piece of cake.
This post was edited on 8/16/19 at 8:35 am
Posted on 8/16/19 at 9:06 am to elprez00
quote:
n. So if the parish main sewer line is at 4’ and the line from the new airport ends up at -1’, then you put a lift station in at the main connection to pump the sewerage off site
But you’d put that in the original plans. You don’t engineer a project and “discover” a lift station is required after all the gravity system is installed. At least competent engineers don’t.
This post was edited on 8/16/19 at 9:08 am
Posted on 8/16/19 at 9:09 am to LSUFanHouston
Shitty situation and all Landrieus fault
Posted on 8/16/19 at 9:09 am to elprez00
Exactly the piles hold up the building foundation. If that’s sinking it’s a huge deal.
If the soil is sinking that’s as expected and it’s not from the weight of the building.
If the soil is sinking that’s as expected and it’s not from the weight of the building.
Posted on 8/16/19 at 9:13 am to TigerFanatic99
quote:
Experts say hangers cost approximately $6 each
the hangers them selves might cost $6, but i would imagine you have about 15 minutes of labor in each one.
you have to cut the rod, bend the rod around a jig based on the pipe size it is supporting. while back-filling the pipe you have to locate each hanger and make sure it stick out of the dirt. after the slab rebar is installed, you then need to bend the rods over and tie ware them to the rebar mesh.
Posted on 8/16/19 at 9:15 am to doubleb
quote:
But you’d put that in the original plans. You don’t engineer a project and “discover” a lift station is required after all the gravity system is installed. .
You’d be surprised.
I once built a school where the drainage system as designed to maintain the flow the drawings wanted resulted in the lowest catch basin being lower than the parish storm drain. In other words the main line sending storm water offsite flowed uphill.
You find it and submit the RFI to the architect asking what they want you to do.
Posted on 8/16/19 at 9:36 am to elprez00
quote:
You’d be surprised
Like you I have been surprised, but you’d have to agree it was poor engineering, right?
And I bet you discovered the issue before the project was finished.
Posted on 8/16/19 at 9:39 am to tigeraddict
quote:
the hangers them selves might cost $6, but i would imagine you have about 15 minutes of labor in each one. you have to cut the rod, bend the rod around a jig based on the pipe size it is supporting. while back-filling the pipe you have to locate each hanger and make sure it stick out of the dirt. after the slab rebar is installed, you then need to bend the rods over and tie ware them to the rebar mesh.
Obviously you have done it before.
Posted on 8/16/19 at 9:40 am to doubleb
quote:
but you’d have to agree it was poor engineering, right?
Not really, there's a million reasons a design works on paper but doesn't translate to what is ultimately built.
Having said that, I've had some big change orders due to pretty silly blunders on the part of some of the firms involved with this, so...
Posted on 8/16/19 at 9:49 am to LNCHBOX
quote:
Not really, there's a million reasons a design works on paper but doesn't translate to what is ultimately built.
I’m sorry, it’s basic engineering.
The first thing you do is a field survey yo determine the invert of the system you are tying into and the capacity of same. Then you lay out your new system incorporating the building plans showing all elevations.
It’s basic stuff, not rocket science.
Posted on 8/16/19 at 9:50 am to doubleb
quote:
I’m sorry, it’s basic engineering.
The first thing you do is a field survey yo determine the invert of the system you are tying into and the capacity of same. Then you lay out your new system incorporating the building plans showing all elevations.
It’s basic stuff, not rocket science.
Well congrats on being the only consulting firm in existence to never have to change your plans.
Posted on 8/16/19 at 9:56 am to LNCHBOX
quote:
Well congrats on being the only consulting firm in existence to never have to change your plans.
If the plans change, the design changes; however, that should be all coordinated.
You wouldn’t finish the project and then realize you now need a lift station.
You realize the need for the lift station when the changes are made.
Posted on 8/16/19 at 9:57 am to doubleb
quote:
If the plans change, the design changes; however, that should be all coordinated.
You wouldn’t finish the project and then realize you now need a lift station.
I wouldn't really call this project finished
But your claim that basic engineering can keep major changes from happening is just kind of not true.
I would agree this project has been handled poorly, but that's not all you said.
Posted on 8/16/19 at 10:05 am to LNCHBOX
quote:
I wouldn't really call this project finished
I haven’t followed the airport project closely, but if they have set plumbing fixtures, and are trimming out then I’d say if they are just learning they need lift stations then someone really screwed up.
quote:
But your claim that basic engineering can keep major changes from happening is just kind of not true
You are back tracking now, all I said was this late in the project isn’t the time to discover you need a lift station. If changes were made to impact sewer elevations that should have been known at the time the changes were made and not upon completion.
I never said good engineering can prevent all change orders, but good engineering can prevent unnecessary change orders.
Posted on 8/16/19 at 10:07 am to doubleb
quote:
You are back tracking now
Your lack of reading comprehension means I'm backtracking?
Posted on 8/16/19 at 10:23 am to fightin tigers
Mein Gott!
"Fire Spotters"!
"Fire Spotters"!
Posted on 8/16/19 at 10:25 am to elprez00
quote:
When you drive piles in most places you’re driving to bedrock or a more substantial soil base. Here, you’re driving to blow counts, ie I’m driving until it takes 5 blows to move one foot. There is no bottom. It’s all friction
I always thought you just drove it until a certain amount stuck out from the surface.
Learn something new everyday
Posted on 8/16/19 at 10:31 am to doubleb
quote:
I haven’t followed the airport project closely, but if they have set plumbing fixtures, and are trimming out then I’d say if they are just learning they need lift stations then someone really screwed up.
One of the major delays was attributed to a major sewer line that started sinking about 5 min after installation. I remember reading that said sewer design was based completely on gravity. The movement of the line meant the gravity option wouldn't work, so they were going to reinstall / build a new line that would use mechanics (I guess a lift station) to work, instead of gravity.
I may be screwing up some of the terms here. But there were a bunch of news about it, last fall I think.
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