This 2 sectioned staff is actually a farming device and evolved into a weapon used by the common folks. The bigger size is known as shaokan (梢杆) while the smaller size is known as shaogun (梢棍).  The shorter section is attached to the longer section via chain of rings. At the other end of the longer section is usually a pointed tip.

This weapon routine is not commonly taught beyond China. In the Chen village,  Chen XiaoXing’s school teaches them. Let look at the 2 routines here and you will see how it is being used. The common ways of using this weapon is to whack, hack, press, whirl. There is some similarity to the Chen Taijiquan Spring and Autumn Falchion routine.

First we have the smaller one, 梢棍

Next we will have the bigger one 梢杆。 Look at 0:27 . Can you do it?