What's the function of the plastic tube in this crown beam?
Because the screw to pass through the concrete cover, casing, Chaimo screw can be conveniently taken out. The exposed part of the tube will eventually be removed, and the tube will be poured into the mortar to smooth it out.
This is not intentionally reserved. It is a means of construction. When installing the side die, both sides of the pull screw are taken into account because the template is subjected to concrete extrusion.
It doesn't work. It's left by the screw
