MOLING APPARATUS

摘要

A moling apparatus (2) comprises a housing (4) having a head (8) for penetrating ground, an anvil (16) disposed in the housing connected to the head, a hammer (18) disposed in the housing and spaced therefrom by resilient restraint means (20). A vibrator unit (42) is spaced from the hammer and arranged to transfer vibration to the housing and the hammer. In a first mode of the apparatus, vibration transmitted to the housing causes fluidization of the surrounding ground to allow progressive penetration of the apparatus. In a second mode, the braking effect of the ground on the head causes the hammer to move against the resilient means and impact the anvil thereby driving the head through the ground, said apparatus being operable at or between said modes.