Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Has anyone had to do this. What does it entail? Thanks.
Has anyone had to do this. What does it entail? Thanks.
Can a subflor scanner be a cheaper alternative to xraying?
Can a subflor scanner be a cheaper alternative to xraying?
$400 is a cheap price to make a potential catastrophe not your problem.
I've use it to FIND metal. I've never used it to avoid metal. I would be scared to do that
What do you mean? If you find the metal then you can avoid it,no?
We always sub out coreing over 1".
There is a contractor here that does the x-ray and the coreing so we let him handle the liability.
Like ohmhead says the screw up is yours if you hit something and as he has described before PT cables are no fun to hit.
Well a post tension cable runs thur a concrete slab or deck at a high tension. Meaning its pulled with at high level like 8000lbs and more . basic cable to pull concrete together under pressure concrete will not crack but can bend and expand .
If one compresses concrete its stronger !
If one drills into it its like a rubber band which snaps it can come up thur slab breaking the surface or it will take a path straight out the end in both directions like a bomb going off .
It can be 25 ft 100 ft to 300 ft or more in length they have a outer jacket of plastic there filled with a grease for movement and corrosion .
The rigid harden steel inside cable its twisted stranded cable like on a bridge tension tie sup cable think 2/0 wire size or 250 mcm in contrast .
The colors of the cable is the type and size there light weight means less steel in structure so thats why they use them.
Let me send you a deck shot of a post cable deck on one of our projects you can see it better.
I can say it in 35 years ive seen two get drilled thur and they can come out on there own with no help if not installed correct meaning they are on chairs and if one of the chairs breaks and its now real close to the slab surface when they pull it ive seen them fly out of the deck and chucks of concrete flying thur the air guys running deck blasting apart .
Just make sure you read the fine print of any contract. A GC I worked with hired a surveyor to layout where a fixed pier should go. Surveyor screwed up and it cost the GC about $20K to fix the mistake. Fine print in the contract said the limit of any damage claim against the surveyor was the amount of the contract. We all learned a lesson that job.