Abstract
Blaster and hand breaker methods are used for teardown, although these methods are limited to use under ambient conditions in terms of noise and vibration in urban areas. A new environmentally sound method has therefore been proposed to consider both workability and economic efficiency.
This paper presents the efficiency test of a new trench excavator by using multistage type edge excavation. A model excavator has point attack bits for foregoing excavation and multi stage disk cutter bits for edge excavation. Foregoing and edge excavation are simultaneously carried out by the model excavator. Penetration speed control experiments were carried out first to estimate the force required to excavate. Then experiments were carried out under constant loads. It was recognised that the torque acting on the model excavator showed no significant differences between mortar and concrete excavation and that the penetration speed and torque could be controlled by the force.
