The MRT42

According to Edward Seager of Bennetts: “We chose the MRT42 as it addresses the very specific requirements of urban construction sites and therefore offers us good hire potential.

“As this tower crane features a small flat top, with a small tower that fits in a 1.2m square lift shaft, it is ideal for the tight city centre sites which are increasingly common. When compared with conventional “A” frame saddle jibs its flat top design requires less lifts, saving time and money through fast erection. Also, its design enables the jib to be split, so that less room is needed for the mobile to assemble it. Another operational advantage is that it top slews, which uses less room than a self erector.”

The crane is made Raimondi in Italy.

The design of this saddle jib tower crane has reduced the number of components that have to be put together on site, as the back jib, slew ring, hoist winch system, slew motors, electrics and driver’s cabin are all contained in one complete unit. This modular concept dramatically simplifies the whole erection process, thereby considerably reducing on-site erection times and manpower costs. By minimising the number of components to be assembled the structure can be carried on standard trailers, thus minimizing transport costs, Vanson Cranes said.

Its flat top design not only makes erection easier, but also enables these cranes to be stacked one above another on a busy site, during operation, whilst maintaining the required safety margins between each crane jib. This capability can be invaluable where three or four tower cranes are operating on the same site, as the contractor can avoid incurring the additional capital cost of increasing the height of the highest positioned cranes, Vanson Cranes said.

By featuring a soft start system on both the hoist and trolley this piece of electronic engineering achieves a progressive acceleration and deceleration of motor speeds to gain much greater control over the crane’s movements. This enables loads to be placed far more precisely whilst reducing the amount of stress on the crane’s structure. This can have a dramatic effect on the crane’s components increasing the operational life of the ropes, pins, bolts, motors and gearboxes. The inverter can also be used to provide condition-monitoring capabilities, which informs the technician of any problems within the system to help protect the motors from under and over voltage, Vanson Cranes said.

As this tower crane has combined simplicity of use and high performance criteria with advanced design features, it not only increases operational efficiencies but also helps to reduce overheads. At the same time it offers a very good metre ton lift capacity against capital cost, Vanson Cranes said.