Introduction of the Recycling and Reusing Method of Screw Steel Pile EAZET

EAZET pile is a type of screw steel pile which consists of a pile shaft and a helical plate attached to the bottom. It is commonly known as an environmentally friendly pile method. It generates no surplus soil nor muddy water during installation by screwing the pile into the ground with its helical plate at pile tip. On the other hand, by rotating reversely, it can be pulled out and retrieved, thus also be recycled and reused if necessary. This article presents the recycling and reusing procedure and criteria of screw steel pile EAZET based on experience. For safe and smooth retrieval, capable machine should be chosen carefully in advance. The capacity of the machine and the torque during retrieval should be constantly noticed, especially when the retrieval is conducted long time after installation. The reason is that the ground disturbed by the pile installation has recovered, where it requires larger torque for pulling out. Retrieved piles will be examined via visual check, dimension check, and bending test of the pile shaft. After that, they will be divided into reusable members and non-reusable members. Reusable members can be repaired for future reuse. On the other hand, non-reusable members are recycled as reproduction materials for components in recycling factory. Recyclable and reusable features of EAZET enable it to be further adopted by temporary structures besides its original market. It can contribute to the transformation from economical society to recycling society where the efficient usage and recycling are emphasized.