A PIN FOR PIN INSERTION TEST

摘要

PURPOSE: A pin used for a pin penetration test is provided to prevent damage to shotcrete side due to a spin by inserting a pin in a shotcrete side without eccentricity in a pin penetration test. CONSTITUTION: A pin used for a pin penetration test comprises a body part(110), a head part(120) and a guide rubber(130). The body part includes an insertion end whose diameter is unbalanced. The head part is meshed with the other end of the opposite direction in which the insertion end of the body part is formed. A hollow is formed in inside in the guide rubber and the body part is inserted into the hollow. The guide rubber is composed in order to be slide on the outer circumference of the body part. A plurality of protrusion lines is perpendicularly projected on the inner circumference of the guide rubber.