Block and tackle gets used when fine adjustments are needed while installing a product onto a building or structure. The products could be anything like stairs, steel, balconies, façades, pods, etc.
The block and tackle gets attached between the crane and the load. Once the load has been lifted slightly off the ground, the slingers might level it up before taking it to the location, using the block and tackle, via a chain that, when pulled, tilts the load the way they need it.
When the load is at its destination and is about to be installed, fine adjustments get made with the block and tackle, whether it’s tilting the load or moving it up and down.
These get used when precision is key. Sometimes, when cranes hoist up or down, there can be a bit of bounce afterwards. And cranes aren’t always capable of gently hoisting in millimetres. So, the block and tackle will make those tiny adjustments gently.
This is especially important as, when these installations get done, fingers and hands are often in positions where they can get crushed.
Above is an example of four block and tackle being set up to lift a balcony. One on each corner. Each one will get attached to each hook of four-leg chains. This method allows for the balcony to be tilted in all directions if needed.