A example of collaborative construction is debate for the purposes of finding truth(sorry some Hegel is going to come out)
It could be argued using Hegel that our entire understanding of natural laws is a collaborative construction, as every single one of us holds a piece of truth, when we come across each other we will disagree and argue holding on to the piece of truth we have that drives us, but when we have argued enough, the essential truth we hold and the others person's truth can combined to a unique 3rd perspective where either side as lost nothing but the weaknesses in their argument and has ideally gained the strength of the other.
I say this is a collaborative construction as this process of building our current understanding of everything is only possible BECAUSE we are working together to decipher the mysterious of nature and it is a group effort for humanity to do so, as without some the picture is incomplete.
That philosophical example aside, study groups are also another example of the same thing but on a much smaller scale. As each member throws their perceptive and understanding of the material to everyone in the group, they all benefit, including the one who is presenting the idea, the entire group grows as a direct result of the group effort, as their understanding of the selected material grows.