Excavator and method of using excavator.

摘要

An excavator for constructing an underground continuous wall includes an extensible guide post (9), an endless chain (17) extending around a chain driving wheel (11) provided at the upper portion of the guide post and a chain sprocket (14) at the lower portion of the guide post, and a number of cutter bits (B) and a number of agitator bars (18) alternately arranged on the chain to form an endless chain cutter and a jet pipe (20) provided in the guide post for connection to a fluid supply source and having a number of nozzles (21) branched from the jet pipe. The endless chain cutter (17) is detachably fixed to the end of a boom (7) extending from a vehicle (A). The endless chain cutter (17) may be mounted for vertical movement on the boom (7) and be vertically driven by a driving device. The cutter bits (B) may be changed for harder cutter bits if obstacles are encountered in the ground. <IMAGE>