Tag Archives: foundation

Foundations for a Tall Building

I have already posted a couple of times about the construction next to our old apartment in Chicago.  The demolition of the Sun Times building was here and the removal and replacement of Wabash Avenue was here.  This was all associated with the construction of the new tower.  Since the plot on which this tower was going to be built was pretty small, it couldn’t be a traditional steel frame skyscraper.  The provide the stiffness needed for such a slender tower, it had to be constructed of concrete.

This required a substantial foundation.  First was the need to clear out the old foundations.  The Sun Times building had been constructed on top of a ton of piles that were timber poles driven in to the ground.  These all had to come out before anything else could be done.  Tons of them would be lying around at various times as they were pulled out prior to being taken away.

Next was the need to drill down for the new piles.  I seem to recall that they went down about 130 feet but my memory may be off on that.  Some of the piles were really wide while others were slightly narrower.  Larger drills would take out the earth and then steels cylinders would be inserted in to the whole.  Rebar reinforcements would be inserted before the concrete could be poured in to make the final pile.  This process was repeated across the site over a course of months.

All of this was the precursor to the main foundation.  The building was built on top of a concrete raft.  This sat on top of all of the piles.  It was a single pour.  The whole pour took about 48 hours.  A steady stream of trucks brought the concrete in from a mixing plant a couple of miles away.  The mix was a special high strength one and each truck was tested as it arrived.  Pouring such a volume of concrete continuously required great care because the material generates heat as it sets and there was constant monitoring to ensure that the overall temperature remained within range.  Once they started, they couldn’t stop.

The whole thing apparently went to plan and the result was a large concrete base on which the rest of the construction effort would build.  After months of preparation, finally it was time for things to start going up again.

Collings Foundation

wpid10346-C59F8178-Edit.jpgThe Collins Foundation carry out a tour throughout the country with their vintage aircraft showing them off to many communities, sharing a message about what people did in the Second World War and providing an opportunity to ride in some historic machinery. I have seen them in the past while we lived in Chicago. Their tour this year brought them through the Bay Area with stops at Moffett Field and Livermore. Since the latter is close to home, I went along to see them.

wpid10336-AU0E7769-Edit.jpgThe part of the collection that they bring on tour includes a Boeing B-17 Flying Fortress, a Consolidated B-24 Liberator and a North American P-51 Mustang. I headed over to Livermore ahead of their planned arrival time and plenty of people had already gathered to see them come in. We all waited for a while and then the B-17 appeared over the hills. It made its approach and landed a short while before the B-24 showed up and followed suit. The P-51 was last of the three making a nice pass before landing. What I hadn’t anticipated was a B-25 Mitchell was also following them in. A quick turnaround and the three main players were soon launching off for flights with expectant passengers.

wpid10271-C59F7859.jpgAt this point I headed off as I had other things to do. Later in the day I came back and managed to catch an evening launch of the B-17. The following evening I had more free time so came back again. Another evening launch and recovery as the light got better and better. Then, as everyone packed up, the Collings team was kind enough to let me take some shots around the ramp. A local P-51 was parked up while the Collings P-51 had disappeared somewhere. As the sun set, I shot around the various aircraft and included a cracking 1937 Oldsmobile that one of the volunteers had brought along. With the light fading, the ramp lights came on which gave me a whole new bunch of opportunities to get some shots. I shot a lot until it was pretty late. At that point I headed home. The following day they also departed moving on to the next stop on their tour. If they come your way, make the effort to get out and see them. If you have the money, take a ride and support the continued operation of these great aircraft.

Waukegan Part 2 – The Military Stuff

As mentioned in the previous post, the Collings Foundation were at Waukegan with  their B-17, B-24 and P-51.  Pete and I had headed up there to take a look at what was going on.  This was the last day of the tour at Waukegan before they moved on to Palwauckee.  They were supposed to be flying during the day and then departing in the early afternoon.  Things were looking promising with the B-24 taking off while we were over at the Warbird Heritage Foundation hangar.

The P-51 was apparently being a little troublesome but was also scheduled to take someone on a ride while we were there.  A friend of mine, Chris, volunteers for Collings and he was working with them that day so i took the chance to catch up with him.  I give him regular abuse as he got a ride in P-51 Baby Duck once before when I was shooting it.  I must be a lucky omen for him!

We needed to head back to Chicago for Pete to be ready for the return flight but the warbirds hadn’t yet departed.  We decided to give them a few extra minutes.  The B-17 had headed out first but the B-24 was obviously waiting to make sure the P-51 was away.  Unfortunately, the engine was not looking too willing when it came to starting.  Fortunately, a bit of ground power did the trick and they were away.  As it turned out, Chris had made it in to the back of the P-51 so I got him in another one.  I hope he recognizes my role in all of this!

Model Day in 15 Seconds

You might be a bit bored with me playing with time lapse video.  If so, look away now!  Here comes another one.  We had guest visiting for the New Year and one of the things we took them to see was the scale model of the city.  The Chicago Architecture Foundation has a shop on Michigan Avenue and the building in which the shop is located has a large atrium.  In this atrium is a model of the city.

All of the buildings in the Loop and some of the surrounding areas have been accurately recreated using stereolithography.  This is a technique using resin and lasers that builds solid objects one minute slice at a time creating a solid object of great complexity.  If you are interested in the technique, head over to YouTube and search for the term and you will come across a number of videos showing it in action.

The model is set up in the atrium with custom lighting.  Apparently, the lighting is designed to recreate the pattern of the sun from sunrise to sunset over a 15 minute period.  I had been to the model a number of times and had shot details of it before.  This time, I decided I wanted to get a time lapse of the light progressing across the model to see how it came out.  Since I had the plan ready in advance, as soon as we got to the place, I set up the camera and then went back down to join the rest of the crew.  There is enough in the model to keep people interested for 15-20 minutes so I wasn’t going to delay everyone.  It did mean, however, that I had to carry a bunch of stuff around with me for the rest of our walk!

Enough of the back story.  Here is the video that resulted.  To be honest, I don’t think the lighting effects are as obvious as I had hoped that they would be.  However, you do get to see some of the movement of the light.

First Flight – for a while at least

My friends at the Warbird Heritage Foundation in Waukegan have been working for a long time on adding another aircraft to their already excellent collection. The newest aircraft is a P-51 Mustang called Baby Duck. It is many years since Baby Duck last flew and she has gone through an extensive restoration since being recovered from a storage location near Philadelphia.

The work has been undertaken at Tap-Air in East Troy WI. They have been putting her back together after a thorough restoration of the whole airframe and engine and the whole process has been coming to a climax with the approach of the first flight post restoration.

After some engine runs and taxiing tests, the date for the first flight was set. Paul Wood, the owner of the foundation, kindly invited me up to see the flight and I headed up to East Troy on a gorgeous day. Pilot for the first flight was Vlado Lenoch. Vlado is a highly experienced pilot of Mustangs. He has his own aircraft, Moonbeam McSwine which he displays all around the country. However, he has flown many other aircraft. I think he said that this was his 25th!

After some final checks on the airframe, Vlado fired her up and taxied off for departure. I headed to a spot up the field to be ready for the first wheels up moment. While it was a lovely day, it was warm and sunny so heat haze was a big deal. However, you don’t get to choose when these things are happening so you go with it and get what you can.

The first flight went very well. Vlado took her up to altitude, cycled the systems, undertook some handling checks and basically made sure things were good. Then he brought her back for a flyby – a good sign that he was pleased with the aircraft. There then followed a debrief about e issues that he had found. The Tap-Air guys then took the opportunity to try and fix a few of the issues that could be dealt with immediately while we had a bite to eat before Vlado took her up again.

This time he had a longer sortie and pushed her a little harder with some basic aeros. All went well and again he showed his comfort with everything with another flyby. After landing, another debrief with the guys and a list of tasks to be worked on. There is still some work to do but, hopefully she should be making her way to her new home pretty soon. Probably not soon enough to make it to Oshkosh this year but there is always another year!

As a finish, I animated some of the shots together to make a pseudo-video.  Here is the result.