construction digger heavy machine trencher vehicle bulldozer cutout excavator isolated tractor construction machine craftsmanship ditch repair tool Dirt meadow tracked tracked vehicle beach coast match box matchbox protection shore working angles arm danger dangerous elevated elevation equipment external height heights high hydraulics lifting machinery perspectives post-hole-digger power power-pole raised raising replacement replacing risks risky safety service spiraling spiralling trucks up-high vehicles work dig earth excavate groundwork hole machines wheel wheels construcion transport