The TERRA MINI-JET MJS 1600 is a manhole HDD drill for directional bores in lengths up to 50 m (165 ft) with a minimum turning radius of 15 m (50 ft). The directional bore can be reamed in several steps up to 300 mm (12”) even in hard ground. The TERRA MINI-JET MJS 1600 is equipped with a torque of 1600 Nm (1200 ft.lbs) and thrust and pull back forces of 60 kN (6 tons, 13’200 lbs).
The MJS 1600 can drill from manholes with an internal diameter of 1.0 m (3.3 ft) and can fit through manhole entrances of just 0.62 m (25”). Where the entrance is smaller than this, the manhole cover frame can be removed. First the drill’s bed frame is lowered into place in the manhole and tightened hydraulically in position, thereafter the manhole drill is lifted vertically through the manhole cover and bolted onto the bed frame. Drilling and back reaming takes place with bentonite drilling fluid pressure of 0-55 bar (0-800 psi) and drilling fluid volumes of 0-38 ltr/min (0-9 gpm). This makes the TERRA MINI-JET MJS 1600 a small but extremely effective horizontal directional drilling (HDD) machine.
The entire operation of the TERRA MINI-JET MJS 1600 is controlled from the surface where the operator along with the control station, rod magazine and rod lift are positioned.
There is no requirement to enter the manhole during drilling and back reaming work. The operator inserts a new drill rod into the rod lift. The rod lift transfers it down into the manhole and positions it in the drilling machine.
The new drill rod is screwed into the last drill rod. Inductive sensors make this operation possible even where the operator does not have a view into the manhole. The rod lift may also be positioned at an angle over the drilling machine where the manhole entrance is not located directly on top of the drilling machine. .
- with 3 cylinder KUBOTA Diesel engine with 24 kW (33 HP)
- the Diesel engine operates at 2’500 r.p.m.
- with 2 independent hydraulic circuits
56 ltr/min @ 175 bar (15 gpm @ 2’500 psi) for the pit frame
28 ltr/min @ 125 bar (7.5 gpm @ 1’800 psi) for the mixing + pumping station
- box for documents
- large oil cooler with 6.4 kW cooling power, allows even ropical and desert operation
- service friendly
- environmentally friendly
- optinal with particulate filter
- 12 Volt plug with 5 A (60 W)
- with separate 1’100 ltr-tank (290 gal) for Bentonite or Ejactomer
- with support plate for 2 bags of Bentonite each 25 kg (50 lbs)
- the Bentonite can be easily filled into the funnel mixing pump with 800 ltr/min (210 gpm)
- injector (venturi jet)
- 1’100 ltr (290 gal) of drilling fluid are mixed with Bentonite within 4 minutes high pressure drilling fluid pump of FMC
- maximum drilling fluid volume: 38 ltr/min (10 gpm)
maximum drilling fluid pressure: 55 bar (800 psi)
Technical Data * Depending on ground conditions
** Depending on drill rod size
pullback force6 to (60 kN)13’200 lbs (6.6 US tons) thrust force6 to (60 kN)13’200 lbs (6.6 US tons) driving power24 kW (33 PS)24 kW (33 HP) torque, 1st speed1600 Nm1200 ft.lbs torque, 2nd speed–– drill rod rotation speed, 1st speed0-115 U/min0-115 rpm drill rod rotation speed, 2nd speed–– drilling fluid volume38 l/min10 gpm maximum drilling fluid pressure55 bar800 psi drilling speed – quick gear10 m/min33 ft/min1.5 m/min5 ft/min noise emission in 7 m distance–– noise emission at operators ear–– pilot bore diameterØ 60 – 100 mmØ 2.4″ – 4″ maximum backream diameter*Ø 260 mmØ 10″ maximum drilling length *40 m130 ft drill rods, length0.39 m1.28 ft drill rods, diameterØ 47/30 mmØ 1.85″/1.2″ minimum turning radius**1550 ft Dimensions pit cradle LxWxH1 x 0.55 x 0.80 m3.3 x 1.82 x 2.64 ft Dimensions LxBxH Control Station1.65 x 0.55 x 2.31 m5.45 x 1.82 x 7.62 ft weight of the pit cradle300 kg660 lbs Weight Controll station170 kg560 lbs