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Old 12-13-2018, 09:05 AM   #141
bigpicture7
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Re: San Francisco high-rise sinking, tilting

Some cool details on the proposed fix:

https://www.enr.com/articles/46053-r...several-months



They are planning to extend the tower's 10ft thick mat slab outboard, then literally pile jack the extended mat with bedrock-anchored piles:
Quote:
Piles would extend up through an 8-ft-wide extension of the tower’s 10-ft-thick reinforced concrete mat—4 ft from the old mat. New and old mats would be connected by chipping into the side of the old mat and coupling new reinforcing steel onto existing rebar.
Fascinating:
Quote:
The system relies on loading each pile with 800,000 lb using a permanent hydraulic jack that reacts against a new mat extension. The jacks would be housed in a maintenance access vault above the mat (see diagram, facing page). The team has applied for an easement to work under the sidewalks, which meet at the northwest corner of the block.
The quick math: 800k lb x 52 piles = 41.6 million lb of jacking force
(holy moly)
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Old 12-13-2018, 11:18 AM   #142
Justin7
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Re: San Francisco high-rise sinking, tilting

^ This is awesome.
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