It is a new model for installation and maintenance of highway anti-collision guardrail post and beam newly developed according to usersf+ needs. (the equipment has obtained the national patent, no.: zl 01 263422.0). The functions of this product are the same as njj series truck-mounted pile drivers. It adopts independent diesel engine as its driving force. The driving speed is 40-60 km/h. The equipment integrates pile driving and pile extracting, with 240fp rotating device. The equipment does not need turn the direction during driving and drawing the guardrail post on both sides. The equipment can operate independently when separated with the chassis, can adjust the hydraulic driving directions. It is equipped with brake device which is safe and reliable in operation. Main technical specifications Type of hydraulic hammer Tdb180 Tdb230 Size (lf+wf+h) Mm 4200f+1800 f+2800 4200f+1800 f+2800 Engine power Kw 16.2 20 Radius of gyration Mm 2100 2100 Lateral distance Mm 860 860 Highest working height Mm 4680 4680 Working pressure Mpa 16 16 Pile extracting force Kn 78.4 96.5 Impact frequency Hz 5.8-13 10-15 Working height of hydraulic hammer Mm 700-3000 700-3000 Speed Km/h 40-60 40-60. Export adn sea-worthy standard special packaging.