breaking stones with a heavy-duty jackhammer

jackhammer ground stones rocks tool heavyduty metal sunny sunlight trench trenches breaking heavy-duty jack-hammer used break embedded rock waterpipe instalation installation excavator construction bulldozer digger machine industry machinery dig equipment site work excavation digging earth jackhammer hack hammer breaker rock yellow heavy duty dirt hydraulic vehicle working arm arm cylinder boom boom cylinders stick sticks booms arms swing tower swing frame pitman side link dipper dippers crowd stone stones breaker