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Discussion Starter · #1 ·
This house had obvious signs of settling and movement. Engineer specified 9 helical piers to support the rear of the house.

Another limited access project, just over 30" opening in the brick pillars, stone walkway.



The deck was being removed by others and rebuilt so we knew we could work off of it with no problem or worry of damage. Part of the house is curved, the part to the right is an addition. Both had horrible foundations.



I was able to push the digging bar down by hand,


We dig out around the footing, undermine it, chip the face clean and attach our bracket with the post already through it. The hose bib made things a little tight but we had the clearances we needed.



We were able to layout the posts between most of the deck joists.
 

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Discussion Starter · #2 ·
We were able to keep working around from the deck with little trouble.


Getting the machine to the other side was not possible from the front, so we just drove it down the stairs.


A little tight.




Once we have atleast three brackets and posts set we start setting the jacking feet, jacks and lasers. We will work at least three at a time to distribute the loading. We have lasers on the house, as well as the posts, keeping track of any movement.




When the loading is done, the posts are welded to the brackets.
 

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Discussion Starter · #3 · (Edited)
The addition foundation was horrible. The engineer and I came up with a plan of sandwiching the footing between steel and bolting it together. The little pieces welded to the outside are just to continue the currect for the impress cathodic protection. Everything above grade was epoxy coated before installation and then touched up. The mason will be covering it all up.





This is the housing for the rectifier for the impress current cathodic protection.

 

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Dan_Watson said:
The addition foundation was horrible. The engineer and I came up with a plan of sandwiching the footing between steel and bolting it together. The little pieces welded to the outside are just to continue the currect for the impress cathodic protection. Everything above grade was epoxy coated before installation and then touched up. The mason will be covering it all up. This is the housing for the rectifier for the impress current cathodic protection.
Can you tell use more about cathodic protection .
 

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Discussion Starter · #5 · (Edited)
Can you tell use more about cathodic protection .
It uses DC current for corrosion protection. Same technology used for pipelines, off shore drilling rigs, steel ships, etc. It is the same principle of the sacrificial anode used on outboards and such or galvanized hardware. We also use systems like that.

For the ICCP we use a small post with a titanium center, installed in the center of the project, that is connected to the positive side of the rectifier. In this situation, the posts and brackets are connected to the negative side.

http://www.technometalpost.com/en/products/techno-Protection-en/

Here's the mini-rectifier, used for a house raising project after Sandy.


The project we working on finishing up has a gradebeam foundation with our posts, the protection is also connected to the rebar.
 
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