Crane, not bolted down. About all of these big concrete waits . 160 pounds of concrete is the ballast week. Did you have to pour a Big Foundation under that . This is a construction method that we get to, we work with the contractor. We get a load from the crane manufacturer, figure out the downward load and the overturn load. We then make sure that the foundation can take that load. Also, all the anchors on the floor are adequate. Why would you do this instead of fastening it to a fixed base . This crane is not part of the foundation system, so it is out board of the structure. Basically, it is something that worked well with the courtyard and a landscaping and the irrigation outside. In one month, the crane that is going up will be part of the foundation. Bolted to it . Exactly. The other kind of crane, which worked their way up as the building thats taller and lift themselves up and slide and. Those are climbers. The climbing crane. It was a climbing crane that collapsed in 1990. We
The floor above . Because the slabs on grade is a conventional slap, it is not post tension. One of the things the building designers do is to make the floor as thin as they reasonably can. There are several benefits to that. First of all, it reduces the mass of the building. We have 7. 5 inch slab. Conventional slab would probably be 10. 5 inches, which is about 25 more concrete mass. It also reduces the overall floor to floor height, which helps with the architectural facade and the square footage. One of the things people are always looking at is decreasing the floor to floor height, especially in San Francisco where we have clearly defined height limits, and maybe could squeeze another story and there if you are good at it. We see a lot of people struggling with the thickness of all these assemblies, both the Structural Assembly and non structural which might be above the ceiling, where we have the heating, ventilation, plumbing, fire sprinklers. You say that the finish of the conc
Kinds of cranes around the city. We have a fixed height crane, like this, and then we have some that are climbing cranes. This is a Free Standing crane, not bolted down. About all of these big concrete waits . 160 pounds of concrete is the ballast week. Did you have to pour a Big Foundation under that . This is a construction method that we get to, we work with the contractor. We get a load from the crane manufacturer, figure out the downward load and the overturn load. We then make sure that the foundation can take that load. Also, all the anchors on the floor are adequate. Why would you do this instead of fastening it to a fixed base . This crane is not part of the foundation system, so it is out board of the structure. Basically, it is something that worked well with the courtyard and a landscaping and the irrigation outside. In one month, the crane that is going up will be part of the foundation. Bolted to it . Exactly. The other kind of crane, which worked their way up as the buil
Be heated and cooled with forced air, that is where you get the dropped ceiling. Also, corridors and public areas. The dwelling units do not have airconditioning . They do not. They have heating but not air conditioning. Do they have outside air . Absolutely, they have windows and they also have a system called zduct, which provides for a share even when the windows are closed. One of the reasons they have the systems, ever since 1974, chapter 12day of the Building Code requires that you have sound transmission isolation between dwelling units so they cannot hear their neighbors, and between the residential units and the cars at outside. That specifically says that if you are in one of these noise areas, which are on the transit corridor, that you must design the building such that you can ventilate the resident units with the windows closed, meeting all the Noise Control requirements. You close the windows and you still have enough ventilation, which is why people use zducts. That is
This evening, the Rachel Maddow show starts now. Early for a change. I have something to spend this time doing. Exactly. Thanks, my friend, appreciate it. Thanks to you at home for joining us this hour. Very happy to have you here tonight. Who here is old enough to have ever used a typewriter . I took typing class and it was on a typewriter. Im that old. Typewriters started off with a mechanism that looked like this. You pressed a button on a keyboard for a specific letter, but then a little arm, a little bar would swing up from the guts of the keyboard and smack that letter into the inked typewriter ribbon, and thereby pressed the imprint of that letter on to the paper, right . So that was the mechanism. Each keystroke on the typewriter would cause a piece of metal to fling itself up toward the paper. A different little bar with a different letter on it for each keystroke. That was how they started out. But then in 1961, ibm changed all of that. Ibm invented a whole new kind of elect