I Gots Big Nutz

[farmersammm]

Some of the partz for the pipe stands arrived on Friday.............................

1" Acme threaded nutzzzzzz. It's all coming together I guess. Everything's goin' down the crapper, but still paddling

[albrightree]

Whenever I order stuff from Mcmaster-Carr like that, I think of Wiley coyote ordering stuff from Acme Supply Co.

[VaughnT]

I've got some acme rod here that I keep meaning to get some nuts for. I just keep forgetting to measure the stuff to see what size it is. I'll look forward to seeing the stands you build.

[whtbaron]

Years ago I made some support rods ( I think they were about 1") to pull a building back together that was starting to spread. On the joints between the threaded rod and the plain rod I welded them together and slid a pipe over the joint and welded both ends of the pipe. Anywhere I was joining 2 threaded rods I used extended nuts.... similar to what you have but they are about 3" through. Everything was holding fine when we finally demolished the building.

[old miner called Pop]

some of the nuts on the draglines we work on you got to make a wrench or socket for unless you feel like payin 300 bucks for a tool you might use once evry 30 years or so and they are big like maybe 6 inches across the flats or more. Then weld eyes on em and pull em with a comalong....makes for a long day for about 6 of em

[kb0thn]

some of the nuts on the draglines we work on you got to make a wrench or socket for unless you feel like payin 300 bucks for a tool you might use once evry 30 years or so and they are big like maybe 6 inches across the flats or more. Then weld eyes on em and pull em with a comalong....makes for a long day for about 6 of em

That sounds like work! On the wind turbine towers, they hydraulically stretch the ~20ft long anchor bolts. Then you just spin the nut down by hand.

[whtbaron]

I hate to say it out loud, but my nuts aren't that big.... the wrench I needed was around 2 3/16 for the gang bolts of the tandem disc. I made one for the fixed square end, and was in the process of making one for the hex end when I found the cylinder bar wrench from an old combine was close enough to jump on.

[old miner called Pop]

That sounds like work! On the wind turbine towers, they hydraulically stretch the ~20ft long anchor bolts. Then you just spin the nut down by hand.

Seems to me they do something like that with concrete decking dont they? Rods inside the concrete and stretched out and locked in place before its poured Anyone ever here of it or do it? Seems to me they got a fancy name for it but I dont know what it is. I read article about a long long long time ago

[farmersammm]

Seems to me they do something like that with concrete decking dont they? Rods inside the concrete and stretched out and locked in place before its poured Anyone ever here of it or do it? Seems to me they got a fancy name for it but I dont know what it is. I read article about a long long long time ago

"Prestressed"...........it's the stuff that comes down on your head in an earthquake, or collapses out there in Miami. Pure crap.

[12V71]

Seems to me they do something like that with concrete decking dont they? Rods inside the concrete and stretched out and locked in place before its poured Anyone ever here of it or do it? Seems to me they got a fancy name for it but I dont know what it is. I read article about a long long long time ago

Pre-stressed concrete, sometimes they will re-stretch the rods after its poured. You don't want to lift those beams or panels in the center... they will basically explode. saw that when a farmer got some beams to build a bridge and his guys just chokered the first beam in the middle. OOPS.

[Willie B]

Seems to me they do something like that with concrete decking dont they? Rods inside the concrete and stretched out and locked in place before its poured Anyone ever here of it or do it? Seems to me they got a fancy name for it but I dont know what it is. I read article about a long long long time ago

They make a number of products with rebar under high tension. Concrete rail road ties first come to mind, bridge stringers also. Pre stressed is the term I have heard.

[ghost_walker]

yeah prestressed is what runs in my mind as well.

saw it on a discovery demolition program. def not one to mess with as it goes with a bang!!

[RCcrawler]

farmersamm... do you have a plan for your stands? Here is a design I got from somewhere on the web.

[Shootr]

Post-tensioning was used out here in AZ for a long time (maybe still do - not in that industry anymore) on residential home foundation slabs. Cables laid and concrete poured, then they were tensioned and locked off.

[Woznme]

Long time ago I worked on a high rise project doing the air conditioning install. The building was basically four corner concrete columns (which contained vent shafts in which all the service risers were housed) and a concrete centre core which contained the lift shafts and stair wells. The floor slabs were prestressed concrete which were suspended by cables from three perimeter spandrel beams at low, medium and high rise positions and were lowered into position by crane as the building rose up.

These spandrel beams were post stressed. They had cables about a foot in diameter running though them with threaded ends. I don't remember how the threaded ends were attached to the cables. Once in position they had thick flat washers put on the ends (about 1-1/2" thick plate) and nuts about 2 foot AF. They were tightened by hydraulic machines and you could see the sag in the beams disappearing while being tightened.

Funny thing was the builder (an American company) told me they had the technology to construct the building but the technology to demolish it did not yet exist. The building has a rated life span of 100 years so the hope was in a hundred years the technology would have been developed for when the need arose.

[farmersammm]

farmersamm... do you have a plan for your stands? Here is a design I got from somewhere on the web.

That's a nice looking setup. I've pretty much committed to making stands that mount on my saw horses. I'm working on pretty rough ground, and they give me more stability.

The way I'm figuring on building, there will be 62' of pipe involved in one assembly, with the remaining 38' attaching to the first assembly. 38' will be the minimum on the stands. At 15#/ft, that's a bit of weight. I think my little 3pt crane might have enough height, but I'm not sure. Might have to borrow a loader for a day or two. What with the loader going down,, I'm back to using equipment I used almost 25yrs ago

[Ingenuity]

"Prestressed"...........it's the stuff that comes down on your head in an earthquake, or collapses out there in Miami. Pure crap.

Your comment is 'pure crap'.

Prestressed concrete (both pre-tensioned and post-tensioned) concrete has been around since 1940's (in Europe, and in the North America since the 50's).

In an earthquake, a well-designed continuously post-tensioned concrete structure has more structural integrity than most other construction types.

And for the record, the Champlain South Tower collapse in Miami (June 23, 2021) was a badly maintained (and poorly designed/detailed) reinforced concrete 2-way slab, NOT a prestressed concrete slab system.

[Fast Leroy]

Pre-stressed concrete, sometimes they will re-stretch the rods after its poured. You don't want to lift those beams or panels in the center... they will basically explode. saw that when a farmer got some beams to build a bridge and his guys just chokered the first beam in the middle. OOPS.

Post Tensioned

The materials used to post-tension concrete members are ultra-high-strength steel strands and bars. Horizontal applications (like beams, slabs, bridges, and foundations) typically employ strands. Walls, columns, and other vertical applications usually utilize bars. Steel strands used for post-tensioning typically have a tensile strength of 270,000 pounds per square inch (psi), are about 1/2 inch in diameter, and are stressed to a force of 33,000 pounds.

[farmersammm]

Your comment is 'pure crap'.

Prestressed concrete (both pre-tensioned and post-tensioned) concrete has been around since 1940's (in Europe, and in the North America since the 50's).

In an earthquake, a well-designed continuously post-tensioned concrete structure has more structural integrity than most other construction types.

And for the record, the Champlain South Tower collapse in Miami (June 23, 2021) was a badly maintained (and poorly designed/detailed) reinforced concrete 2-way slab, NOT a prestressed concrete slab system.

https://www.structuremag.org/?p=1652...ssed%20members.

[farmersammm]

One might consider that most steel bridges are constructed of open members, thus less susceptible to water damage. Concrete, by its nature, if compromised, will allow water to collect in enclosed areas.........damaging any steel encased within that concrete.

Many steel bridges have been around for a very long time. Concrete bridges seem to have a much more finite lifespan.

https://www.irbnet.de/daten/iconda/CIB9869.pdf

https://www.cte-it.org/wp-content/up...ngs_CACRCS.pdf

[farmersammm]

After a visit with the heart doc, headed over to Tulsa today to pick up my threaded rod from Grainger. They had the best price..........which is amazing. About 46 bucks for 6 feet. Also stopped by Harbor Freight, and swapped the 1 ton trolleys for 2 ton trolleys.

Nice stuff......American made.

While at HF, I took a look at their 1 ton gantry crane. I was surprised to see that it had a 4" beam. That's on the ragged edge of good enough. To be honest.......if I had a regular shop with smooth floors, I'd probably use it, but keep the load to a reasonable amount. Oh Hell...........I probably wouldn't use it K'kins didn't think it looked too substantial either.

[smithdoor]

The biggest nut I made was 4 ½" hydraulic ram

Dave

Some of the partz for the pipe stands arrived on Friday.............................

1" Acme threaded nutzzzzzz. It's all coming together I guess. Everything's goin' down the crapper, but still paddling

[bassboy1]

https://www.structuremag.org/?p=1652...ssed%20members.

Seems that wasn't exactly the fault of prestressed concrete, so much as the fault of poor design and attempting to band-aid issues instead of addressing them properly. I followed that one fairly closely in the months following the collapse, and in that time, there was quite a bit of evidence found that suggested covering up issues for the sake of a schedule, as well as some conflicts of interest regarding designing/inspecting.

[Oldendum]

Big nutz? I think not, Samm.

[farmersammm]