Connections are very crucial when if comes to precast buildings.

The detailing of these connection depends on multiple things.

[1] Structural requirement ( fixed, pinned,..)
[2] Project requirements
[3] Project location & geography
[4] Site & factory constraints

Below are given few sketches for precast connection used at various location in precast buildings.

There are always many possibility to detail a particular, here it shows very few of these.