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Old April 12th, 2014, 11:15 PM   #81
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Old May 7th, 2014, 03:00 AM   #82
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Old May 9th, 2014, 12:15 AM   #83
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Nice, another pretty tall tower for San Francisco
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Old May 9th, 2014, 02:09 AM   #84
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I sure hope they leave that little 3 story house. It would make a great image to show the contrast between old and new!
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Old May 10th, 2014, 12:00 AM   #85
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Quote:
Originally Posted by towerpower123 View Post
I sure hope they leave that little 3 story house. It would make a great image to show the contrast between old and new!
Don't worry, the 3-story building is staying.
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Old June 10th, 2014, 02:39 AM   #86
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The appearance here doesn't change much week to week because the action, for the moment, is underground:


My photo 6/9/14

Looking down Fremont St--181 on the right side near block and farther down, beyond the Transbay Terminal construction and the Millenium Tower, also on the right, is 350 Mission:


My photo 6/9/14
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Old June 10th, 2014, 02:41 AM   #87
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Quote:
Originally Posted by towerpower123 View Post
I sure hope they leave that little 3 story house. It would make a great image to show the contrast between old and new!
It's a very popular restaurant called "Town Hall" and going nowhere. It can be seen in my photo above.
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Old August 19th, 2014, 02:42 AM   #88
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A little old but enlightening:

Quote:
Crews Install Record-Deep Foundation Piles for San Francisco Tower
06/24/2014
By Scott Blair

. . . The 55-story 181 Fremont tower, sited on land reclaimed from the San Francisco Bay after the 1906 earthquake, will be founded on 42 piers that plunge an average of 255 ft—with the deepest down 264 ft—to bedrock.

After drilling up to 264 ft deep and cleaning the holes, workers lower several 70-ft-long sections of rebar into the shafts prior to concrete placement.

Because of the tight site, which is less than 140 ft square and bordered by other large construction sites and a preschool, crews can construct only one drilled shaft at a time. Each takes three days. "It's a tiny footprint," says John Morgan, project manager with subcontractor Malcolm Drilling. "When we bring the cages in at 70-ft lengths, they take up over half the jobsite, laid on the ground. But we know how to shuffle the pieces on the game board to make them fit." On a roomier jobsite, crews could work on multiple shafts at once, Morgan adds.

Workers are sinking some 100 ft of metal casing into the lower clay layer to prevent the top soil from collapsing. They then dig out the rest of the hole using a viscous polymer slurry to create a pressure plug that prevents groundwater and soil from causing a collapse, says Chris Wilcox, senior superintendent with general contractor Level 10 Construction.

After the holes are cleaned, several rebar cages are connected and lowered; then, self-consolidating concrete mix is placed via tremie pipe. The piers are socketed into bedrock 10 ft to 30 ft down.

The structural design calls for the drilled shafts to reach bedrock to support a steel megaframe exoskeleton, which collects loads from a perimeter moment frame up to floor 36 and above that from a braced-frame core. The exoskeleton will include corner mega-columns, built up from 65-ksi steel plate.

Diagonal megabraces linking the megacolumns will perform in two ways. "The primary brace takes all the elastic loads from wind or seismic, but it also has a buckling-restrained-brace fuse in it," says Jason Krolicki, associate principal of Arup, the project's structural engineer. The scheme is currently under peer review, he adds.

During a maximum credible earthquake (MCE), the fuse intentionally yields. Secondary braces engage a viscous damper to reduce motion and vibration under wind loads and also help dampen seismic movement. Dampening vibration and sway is important to maintain occupant comfort levels within the upper 17 residential floors, says Krolicki.

The maximum compression loading to the 5- to 6-ft-dia piles under MCE-level forces is 13,560 kips, while maximum tension is 5,509 kips, says Steve DeWees, Level 10's project executive.

The exoskeleton scheme results in a lighter building than a more conventional structural system . . . .

Once [b]all the piles are complete in mid-July[/b[, crews will begin a 60-ft excavation for the basement levels. The project will start going vertical as anticipated in November, DeWees says.

Scheduled for a mid-2016 completion . . . .
http://california.construction.com/c...isco-tower.asp

Apparently they are a couple of weeks behind that schedule but it seems like the piles are now complete and excavation should have begun or begin soon.
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Old August 30th, 2014, 02:56 AM   #89
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The piles or caissons are complete and excavation underway:





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Old September 6th, 2014, 12:52 PM   #90
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IMG_2509 by davum16, on Flickr


IMG_2508 by davum16, on Flickr


IMG_2507 by davum16, on Flickr
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Old October 27th, 2014, 08:36 PM   #91
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Recent photo of the excavation which has reportedly almost reached bottom:



And while digging, the developer has also been negotiating--with the city, so as NOT to have to include on-site affordable housing and, perhaps, an infamous "poor peoples' entrance":

Quote:
The developer of a 52-story Transbay district high-rise has cut a deal with the city to pay $13.85 million to avoid including 11 below-market-rate condominiums in what will become the highest condo tower west of the Mississippi River.

The payment, $1.26 million per unit, shows how much luxury builders in San Francisco are willing to shell out to circumvent housing laws with affordable-housing requirements — 15 percent in the case of the neighborhood around the Transbay Transit Center. Legislation is required to make the deal happen.

Proponents of the deal, which include Supervisor Jane Kim and Mayor Ed Lee, say the building at 181 Fremont St. represents a unique situation because the first 37 floors will be office space. In a neighborhood where views drive values, all of 181 Fremont’s units will have multimillion-dollar vistas of the bay and the city’s iconic bridges . . . .

“What is unique here is we are only building 67 units, the lowest of which will be 500 feet above the ground,” Lituchy said.

San Francisco has a complex set of affordable-housing requirements that vary from neighborhood to neighborhood. In general, developers have three choices: They can make a certain percentage of on-site units “affordable,” pay a fee based on the number of units or build a separate below-market-rate project within a mile of the project. In the case of the Transbay district, fees are not allowed — the law requires on-site affordable units.

While the fees generate money for affordable housing, the city has been increasingly pushing on-site construction to create more economically diverse neighborhoods. But the case of 181 Fremont St. shows that the city’s affordable housing requirements don’t always work well for super-luxury for-sale condos, said Kim, who is sponsoring the legislation that would allow the 181 Fremont St. deal to go forward despite the neighborhood rule.
HOA fees

While the city controls the prices of below-market-rate units — typically setting the purchase price at 33 to 35 percent of family income — state real estate laws require all homeowners to be assessed full homeowners’ fees whether they paid full price for their condo or bought it through a city BMR program. In the case of 181 Fremont St., the homeowner association dues, which residents pay to cover building maintenance, security, operations and common spaces — will start at $2,000 a month.

“The HOA fees have been super-challenging for the BMR owners in Mission Bay and South Beach,” said Kim, who represents the district. “The challenge for those people has not been the mortgage but the HOA fees. It’s been a huge problem” . . . .

The Jay Paul Co.’s $13.85 million fee would bankroll about 68 units at an affordable project in the Transbay district. That is a much better deal for the city than an uber-chic tower with a few middle-class families struggling to pay the HOA fees, said Don Falk, who heads the Tenderloin Neighborhood Development Corp., a nonprofit developer of affordable housing . . . .
Above image and article: http://www.sfgate.com/news/article/S...#photo-7025950
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Old October 27th, 2014, 11:49 PM   #92
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They can replace the Poor Door with a special Google bus entrance.
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Old November 6th, 2014, 11:07 PM   #93
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whats the progress
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Old November 7th, 2014, 03:02 AM   #94
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Quote:
Originally Posted by optimusprimal1 View Post
whats the progress
They're supposed to finish excavating in mid-November. Then they do the rest of the foundation (aside from all the huge caissons they already installed), and steel is supposed to rise past street-level by January.
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Old November 13th, 2014, 11:42 PM   #95
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SOMA Highrises under Construction - San Francisco by BlueVoter - thanks for 800k views, on Flickr
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Old November 14th, 2014, 05:53 PM   #96
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Need to make a trip back to San Francisco.
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Old November 14th, 2014, 10:53 PM   #97
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Super!
If this is finished before Transbay, it will be the second tallest building in the city, won't it?
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Old November 18th, 2014, 02:03 AM   #98
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Nope

Quote:
Originally Posted by Kanto View Post
I noticed that in these ground breaking ceremonies they always use brand new shovels. I wonder, will those shovels be used by regular workers during construction too?
No, they are chrome plated.
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Old December 2nd, 2014, 11:28 PM   #99
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VIEW OF SF SKYLINE FROM (DEC 1ST, 2014) ,, AN IDEA OF THE CHANGE THATS GOING ON IN THE SKYLINE

https://www.flickr.com/photos/pacifi...-qdWZGy-qbJ4WY
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Old December 6th, 2014, 07:23 PM   #100
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This building has an ad in this week's edition of the San Francisco Business Times claiming "Occupancy Q2 2016". That's less than a year and a half away. If true, once they get the pad poured it's going to have to go up like a mushroom after a spring rain--possible since it's steel-framed.

And speaking of the pad, evidently they are now pouring the concrete underlayment for it--this is usually a thin layer of concrete on top of the dirt over which they will form the rebar for the pad itself. For this building it will have to be very thick I would think (it was 50 ft thick for the shorter Millenium Tower as I recall but that building didn't have the pilings this one now has).
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