Durability + Design
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram Visit the TPC Store
Search the site

 

D+D News

Main News Page


New Fix Proposed for Sinking Millennium Tower

Friday, November 30, 2018

More items for Maintenance + Renovation

Comment | More

A new fix has been proposed to help stop San Francisco’s Millennium Tower from continuing to shift. Since the tower’s opening in April 2009, it has sunk 18 inches and tilted 14 inches to the west.

The new proposal reportedly will stop the sinking but will not correct the tower’s tilt.

What Happened

In April, a fix was proposed that would cost nearly the same as the original cost to build the tower—$350 million.

Hydrogen Iodide, public domain, via Wikimedia Commons

A new fix has been proposed to help stop San Francisco’s Millennium Tower from continuing to shift. Since the tower’s opening in April 2009, it has sunk 18 inches and tilted 14 inches to the west.

According to the San Francisco Chronicle, the 58-story tower sits on a 10-foot-thick mat foundation, held in position by 950 reinforced concrete piles sunk 60 to 90 feet into clay and mud, which do not reach the bedrock. To fix the leaning issue, engineers suggested boring 275 to 300 steel and concrete “micro piles” down to bedrock, only on one side of the building at a time, starting with the west side.

Once the structure is stabilized, the east side would be allowed to sink until the building straightens itself. Then, micro piles would also be driven into that side, preventing the structure from sinking any further.

Those repairs would have taken two to five years, and the homeowners’ association was not happy with the suggestion.

What Now

Earlier this month, however, the Chronicle reported a consensus on the horizon.

This plan calls for drilling piles into bedrock from the sidewalk on the building’s southwest corner, instead of the micro piles going into the bedrock through the concrete foundation.

Ronald Hamburger, a structural engineer for developer Millennium Partners, is behind the new plan, which he says will be less expensive, faster and with less disruption to the residents.

This idea will take several months to complete, according to officials, who note that nothing has actually been submitted to the city yet.

   

Tagged categories: Condominiums/High-Rise Residential; Ongoing projects; Residential Construction

Comment from john lienert, (11/30/2018, 6:48 AM)

the "Hamburglar Project "


Comment from john lienert, (11/30/2018, 6:50 AM)

Hamburger is the one I would consult........based on past successes


Comment from peter gibson, (11/30/2018, 10:26 AM)

That idea is a " nothing burger " That is a very congested area. No room to move at all. The plan is faulty and the logistics well nigh impossible. Plus who's going to eat the cost. Put that one in the next article. HOA won't.


Comment Join the Conversation:

Sign in to our community to add your comments.

Advertisements
 
Novatek Corporation
 
Novatek Portable Air Filtration Systems
 
Air Scrubbers/Negative Air machines for restoration, abatement, dust & odor control, hazardous contaminant removal from job sites to clean rooms and hospitals. Portable, affordable!
 

 
Keim Mineral Coatings
 
Mineral Silicate Paints + Stains Fuse to Concrete
 
• Forms permanent chemical bonds
• Becomes part of the concrete
• Will never peel
• Looks completely natural
 

 
Shield Industries, Inc
 
FireGuard® E-84 Intumescent Coating - Shield Industries, Inc
 
Trust the certified protection of the industry’s most innovative intumescent coating FireGuard® E-84 to provide you with the 1 and 2 hour fire ratings you need.
 

 
 
 

Technology Publishing Co., 1501 Reedsdale Street, Suite 2008, Pittsburgh, PA 15233

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@durabilityanddesign.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 

© Copyright 2012-2018, Technology Publishing Co., All rights reserved