Final answer:
The Tower Crane is designed to be "jacked-up" as needed. Its mast can be extended by inserting new segments into the base, which allows it to grow alongside the building it's constructing.
Step-by-step explanation:
The crane that has the ability to be "jacked-up" as needed is the Tower Crane. Tower cranes are a common fixture at any major construction site. They're pretty hard to miss -- they often rise hundreds of feet into the air, and can reach out just as far. The construction crew uses the tower crane to lift steel, concrete, large tools - like acetylene torches and generators, and a wide variety of other building materials.
When the crew is building a skyscraper, the crane can be jacked up to higher floors as the building rises. The mast of the crane is attached to a large concrete pad that provides the necessary support. As the building increases in height, new segments of the mast are inserted at the base of the crane, and this is known as "jacking-up" the crane.