The TERRA MINI-JET MJS 1600 is a manhole HDD drill for directional bores of up to 50 m, with a minimum turning radius of 15 m. The directional bore can be reamed in several steps up to 300 mm. The machine is equipped with a torque of 1,600 Nm and thrust and pull back forces of 60 kN.
At a depth of 0.8 m it can lay telephone cables, at 1.2 m water mains can be installed, while gas or power lines can be laid at 1.6 m. This pipe laying method was developed over a two year period in close co-operation with the French water supplier SADE.
The MJS 1600 can drill from manholes with an internal diameter of 1 m, and can fit through manhole entrances of just 0.62 m. For smaller entrances, the manhole cover frame can be removed. First, the drill’s bed frame is lowered into the manhole and tightened hydraulically in position and then the manhole drill is lifted vertically through the manhole cover and bolted onto the bed frame.
The entire operation of the TERRA MINI-JET MJS 1600 is controlled from the surface, where the operator, control station, rod magazine and rod lift are all positioned. There is no requirement to enter the manhole during drilling and back reaming work. Instead, the operator inserts a new drill rod into the rod lift, which transfers the rod into the manhole and positions it inside the drilling machine. The new drill rod is then 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 if it is not located directly below the manhole entrance.
Article continues below…Drilling and back reaming take 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 effective HDD machine.
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