![]() In the two indicator piles the central bar was solid and had Osterberg-type load cells inserted in it and the grout was pumped down a separate tremie pipe. As discussed above, for the production piles the grout is pumped down a hollow central rod. I assumed that they stopped withdrawing the casings around the top of the Franciscan but recently I read somewhere that they pulled them up to 20 feet above the top of the Franciscan - not sure about this. So, they did a second indicator pile carrying the casing down into the socket and then withdrawing it as they tremied the grout in. Back at the time of the indicator piles, the first 24-inch pile did not carry the casing down into the Franciscan when they drilled the socket, and the socket did not hold when they tried to do a pullout test. Mostly just more careful monitoring of plug depth in the casings and water and air pressures for the piles. In the recent test piles and casings, not much. Not sure what you are referring to RFreund. RE: SF Tower settlement Part III AusG (Petroleum) 29 Dec 21 03:06 The tower and the shoring wall are just a large shovel. It currently looks to be about where it was in 2016. The uplift of the Mid-Rise was just noticeable in Apr 2011 (Google StreetView) and continues slowly over time. & Beale St., as shown in an NBC image from late 2016. Then there is the uplift of the Mid-Rise on the corner of Mission St. I'm not sure how much basal heave is acceptable but the construction scheme of tying the tower to the shoring wall certainly complicates things. From Nov-2006 to Jun-2007(time letter was written) they recorded continuing uplift of the trestle of 1-7/8 to 2-1/4 inches across the trestle. began monitoring the Trestle erected to facilitate excavation of the Podium/Mid-Rise. This location was troublesome early in the project, with water seeping into the excavation while the tie-back work was going on.īeginning in Nov-2006 Surveyor, Martin M. The tower/podium shoring wall in this area has two sections where the CDSM shoring wall has soldier piles at 2.5 ft OC. The parking garage walls incorporated an integral waterproofing admixture. I'm quite certain the main water leakage/cracking is in the north & west walls of the lower parking levels. SG&H was the waterproofing consultant for the Millennium Tower project and the cracking in the bottom levels of the parking garage, immediately adjacent to the tower/podium shoring wall, will likely remain a chronic problem for the Millennium HOA. The Dan Brown & Associates letter from 23 November 2021 is also at. There are new photos on - The 3rd to last photo shows a center bar in the pile much larger in diameter than the #18 high strength threaded bar previously proposed. Crews will be able to accomplish the objectives of the previously planned retrofit with the reduced number of piles, Hamburger wrote, though he noted that the building’s tilt would not be corrected as much as had been previously predicted. New calculations show piles can bear more weight than was previously known - an estimated 1 million pounds, per Hamburger’s letter, up from 800,000. SF Business Times: "Less is more: Engineers behind Millennium Tower fix have a new strategy" "The required construction is neither complex nor unusual." Ron Hamburger RE: SF Tower settlement Part III dik (Structural) That's 18 million pounds.Ĥ1.6 - 18 = 23.6 million pounds to be held up with something yet to be described. The new proposed piles can each hold up 1 million pounds. Or looked at another way: if the old piles were needed to hold up 52 X 800,000 pounds, then their total uppicity would be 41.6 million pounds. Perhaps they're going to lighten the building? Maybe restrict the number of pianos in each unit? Individually.Ĭorrect me if I'm missing something, but isn't 2.32 (million) a whole lot bigger than the 1 (million) that is mentioned? ![]() The amount the New Piles would have to hold up. If the Old Piles could hold up 800,000 pounds each, then my calculations: That would appear to be the new supported weight per pile, compared to the old (52) quantity. We'll call that 2.9, to continue to avoid the higher math. So you guys should like maybe do some sort of analysis on the following: Now I realize I'm only using arithmetic, instead of some higher math.
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