Construction Lesson (For those interested):
Quote:
Originally Posted by KevinFromTexas
One kind allows them to place it anywhere on or within (on top of) the building, while the 2nd kind is on a large truck
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Yes, there are two types: truck-mounted, and what is called a placing boom. But in reality, they are both the same.
A 61 meter pump truck can reach a good 6-stories up (or more) and still be able to span across the floor in order to make a pour.
Example:
http://www.pumppartners.com/documents/61m.pdf
Once you get above a certain height though, a truck mounted pump just becomes inefficient in its pumping reach. This is when a placing boom comes into play. (Although, if not going much higher, some companies will employ a hose system that is attached to the end of the boom and is manually dragged across the pour area - by hand.)
Once a placing boom is needed, they basically just take the boom portion off of a truck and mount it in the building. That's the part where both systems are the same. The truck stays on the ground and is connected to a hard pipe system that runs up the center of the building. The placing boom is relocated after each floor and additional pipe sections are added to increase the height.
Class dismissed, don't forget about the pop-quiz tomorrow morning!