| 摘要 |
<p>A trench cutting apparatus 400 comprises a main body portion, ground contacting conveying means on which the body portion is mounted and by which the apparatus can traverse the ground and at least one cutting device 412 operable to cut a trench wherein the attitude of the cutting device is adjustable, by means of actuators 456 & 452, between a first use configuration configured for cutting a linear trench portion and a second use position configured for cutting a curved trench portion, said second use position being selected to minimize undercutting of a trench wall as said curved trench portion is formed. The cutter is rotated about horizontal axis 454 in order that the lower part 412a is moved away from the outer trench wall and thereby preventing the formation of undercuts in curved trench portions.</p> |
