Quote:
Originally Posted by Bokimon
Great picture.
One of the things that really interests me is the logistics behind an excavation and site shoring of this magnitude. Notice this site does not seem to use any of the timber lagging to pin against the surrounding soil. Instead a combination of caisson and secant pilings and the lower levels, natural clay?? It can't be bedrock..
This natural layer seems hard enough to not require usage of steel piles or anchoring pins. Somebody needs to do a timelapse of an excavation/shoring in progress so I can see how the shoring work is done.. Apparently the loud scraping noises we been hearing for months has been the excavators CARVING the bentonite mix that encases the perimeter up to the steel pile face which you can see some evidence of what it looks before and after on the north perimeter of the site.
I would really like to see how they get these 4-5 storey long H piles fed into a hole that deep at once. The auger rigs I see on the site do not look 4-5 storeys high..Unless they are?
Big pits are very fascinating as it is amazing how much ground it has to retain from collapsing into the pit as well as other site remedies like ground water which for this site, there hadn't been any really!
That raft slab also looks like a monster, showing us the orientation of the first tower going East-West.
A timelapse of the raft pour also needs to be done by somebody. This is going to be the largest pour since the Bow and EAP. It must be at least 3m thick in a jungle of rebar.
|
Ever heard of Shotcrete? And bentonite is usually used to hold back groundwater and prevent sloughing in during excavation, until concrete replaces it by displacement once the digging is complete. Bentonite is not a structural material.
Prev
Linear Mode
