Upstand:
Upstand is typically used for return legs in a precast element (Panel, Column, Spandrel). Generally, upstand preferred near face in shop drawing. If any special requirement (architectural design) only goes for Far face.
Because far face is a table face, so we can’t provide upstand on Far face due to manufacturing difficulties.
Corbel:
Corbel is typically used for panel thickening increases in a precast element. Its also preferred near face in shop drawing.
Thickness for Upstand:
Total length of return value (sum of panel thickness) to be considered as upstand thickness.
Thickness for Corbel:
Thickness increase value (Apart from panel thickness) to be considered as corbel thickness.
Advantages:
1. The upstand and corbel profile formation used to avoid small size precast elements manufacturing.
2.And also it will help to avoid some small part of in-situ elements on site.
3. The construction time will be reduced.
4. The cost of manufacturing also will be reduced.