Jibanshikenjo Co., Ltd. Home  >  CPT is expected to substitute SPT (N value) in the near future   Electrical cone penetration test has been used in Europe, U.S., and Southeast Asia for a few decades. Lately it is rapidly spread in China and becomes a fixed In-situ Test worldwide nowadays. In Japan, the spread of CPT has been delayed because it is hard to be applied to the hard soil whose N value is larger than 50, and its apparatus is too large. CPT apparatus by direct weight 200KN truck type CPT   However, the concept of design method has been focused on and shifted to the required performance and the limited state. Meanwhile the authentication of ISO is diffusing and the needs for common test methods are increasing. CPT is expected to substitute SPT (N value) in the near future. Deliver apparatus by 40kN-truck Penetrate covered soil Bore hole (Ø=250mm) by auger Insert T-70 Type Repeat-Anchor Mobilization of 140KN reaction Fill pore pressure meter with silicon oil Penetration and measurement of CPT *The CPT machine in above pictures is Model 660T Soil probing machine made by Geoprobe System. Top of this page