Building evacuated in San Francisco due to loose 2000-pound concrete slab

A strut supporting a platform in the elevator shaft broke on the 35th floor of the under-construction skyscraper causing a 30-ton machine used for transferring liquid concrete to lean into the concrete 2,000-pound slab as it was resting on the pla

As SFist reports, "Workers have reportedly been evacuated from the construction site, and the nearby site of 543 Howard as well as several other buildings are being evacuated".

Fire officials described the incident as a failure of one of the struts supporting a crane at the building's core, and said the tilt of the crane system caused one of the concrete walls and formwork to lean out.

Officials have warned people to avoid the area near the building.

As Baxter told the Chronicle during the incident, "The worst-case scenario is we're going to have some structural damage to one or more buildings below", presumably indicating what would happen if the wall were to fall.

He says that if the slab topples over it could damage at least two building below.

Firefighters also went door-to-door requesting that people leave their buildings immediately, as officials flew in an engineering expert from Washington state to develop a plan on how to tackle the issue of the leaning wall. "City inspectors with the Department of Building Inspection as well as our partners with the contracting team have concluded that after their efforts of shoring this building we are now safe".

San Francisco Fire Department spokesman Officer Jonathan Baxter says there is no danger of a 1-ton concrete slab falling from the top of a San Francisco skyscraper under construction.

He added that 'the building itself is not compromised in any way, shape or form'.

The project at 41 Tehama St.is a 37-story, 403-unit luxury residential tower near the Transbay Transit Center site being developed by Hines and Invesco Real Estate. It began construction in 2015, according to a 2015 statement from development and construction management firm Lend Lease.

The developers purchased the property back in 2014 for an estimated $48.5million, according to the San Francisco Business Times. There were no known injuries.

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