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 …

This is a post by our guest blogger, Silkreeling who is also a keen player of Chen Style Taijiquan.

A lesser known figure outside of China, Li Jingwu (1912-1997)probably is one of the most accomplished Chen style Taiji master of his generation. Listed below are some quick references to his achievements:

One of Chen Fake’s top disciples, who could neutralise up to 4 of Chen’s successive fajings.
 Known for his upright character, mild mannerism and integrity, especially when exchanging pointers with opponents.
Respected Grand Master of both Chen and Wu style Taiji.
He is Wang …