Challenging Tower Block Structure - continued
The very top floors from 48 to 60 will be 14,000 square feet each. The building’s spire will reach to 1,176 feet. More than 65,000 cubic yards will be pumped on the project.
The self-consolidating concrete strength varies from 10,000 psi in the core walls at the base to 6,000 psi at the top. According to Marc Pietrini, President of the company:
The 4000 psi lightweight concrete has been pumping well. Our ready-mix supplier, SJA, has been keeping the mix very consistent.
More than 1,300-feet of pipeline connects the pump to the placing crew. Deck pours vary from 400 yards on lower floors to 235 yards for the hotel floors at the top.
Novel Solution for Tower Crane
AmQuip was approached in early 2014 for a hoisting solution on the new building.
The task was to use their luffing tower crane to help build the concrete core. That was easy enough, until they were told that they had to internal climb the crane. The customer did not want the tower sections extending to the base of the building so they could start to enclose the lower floors.
That could done by climbing in the core, no problem. Then the big surprise, there is no room for the crane inside the core.
The AmQuip solution to mounting a crane when the core is full . . climb up the outside!
The available space was already taken up for the forming system and concrete placing boom. So the obvious question was where can the tower crane go?
The only option was outside the core. Some research was done and a photo was presented to AmQuip with a crane mounted outside the core used in another country.
The problem was these cranes were much smaller than what we had proposed for the Comcast project. At AmQuip, the 'Answer is Yes' is one of their mottos so they set about to solve the problem.
AmQuip retained Howard I. Shapiro & Associates to design the support structures for the crane. AmQuip fabricated all the exterior support structures along with all of the large internal bracings in AmQuip’s Birmingham, Alabama facility.
The crane was erected and will complete a total of 9 jumps and at the completion of the jumps, the tip of the crane will be over 1,100 feet above street level
Amquip Crane Hire
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