Thanks very much for producing these videos. I find them fascinating as I work for a competitor to Mace. The dangling orange thing is known as a pile cropper.
The top of each pile in the ground needs the top concrete breaking off to expose the reinforcement within. This used to be done with operatives using hand breaking tools that was slow and noisy. The orange pile cropper on the end of the machine arm is much quicker, safer and quieter.
I've provided a link that explains it in more detail for fellow nerds who are interested.
Keep up the good work with the updates. Much more interesting than trying to peer through the hoarding
Pile Cropping Techniques