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Contractors World

 
Contractors World - AFRICA
The free digital publication for
construction, demolition, mining and quarrying industries.

 
Contractors World AFRICA - 2016 Vol 7 No 5

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Increasing mine safety and productivity in China - continued

The Cat R1700 at the White Mountain Gold Mine in China.
The 38,500 kg loader has a gross power output of 263 kW and standard bucket capacities of 5.7 m³.
Photo: Copyright © 2016 Eldorado Gold Corp.

The Cat R1700 at the White Mountain Gold Mine in China.
The 38,500 kg loader has a gross power output of 263 kW and standard bucket capacities of 5.7 m³.
Photo: Copyright © 2016 Eldorado Gold Corp.

Laser technology keeps the loader’s path true to centre even while going around sharp corners. All that the operator has to do is to direct the tele-remote system in a forward or reverse direction and direct it left or right at intersections.

This system can detect major obstacles and keep the machine traveling on the optimal path. The system also automatically controls the vehicle’s steering, braking and speed. This allows loaders to move more quickly and with less wear and tear.

They are seeing a much larger benefit to production than was originally estimated.

“Loader productivity is up 5–10 percent. It’s a great combination of improved safety and productivity.  The added and most important benefit was the removal and control of personnel from the work area.
     It reduces operator fatigue and virtually eliminates impact damage to the machine hitting the walls.   Meanwhile machine data is transmitted back to the remote control station, so if any critical faults are detected, an alarm sounds and a message appears on the operator’s screen – just as if they were in the cabin.

Mr Uyen said the Teleremote system continues to improve as operator and maintenance skills improve.

Due to the remote location of the mine White Mountain wanted to be completely self-sufficient in terms of servicing and maintaining the RCT system.

As a result RCT delivered a two-week comprehensive training package for operators and technicians and still provides offsite technical and troubleshooting advice if and when required.

Remote Control Technologies (RCT)


Duty Cycle Crawler Cranes In Expansion
of Barcelona Airport

Barcelona-El Prat Airport. The machines included two HS 8100 HD, models belonging to the newest generation from LiebherrDuring the first half of 2016 a total of three Liebherr duty cycle crawler cranes were involved in infrastructural work in the course of the expansion of Barcelona-El Prat Airport. The machines included two HS 8100 HD, models belonging to the newest generation from Liebherr.

Continuous improvements are being made to the airport infrastructure in order to cope with the increasing number of passengers. The work includes, among other things, the linking of the new airport to the suburban railway.

Between February and August 2016, three duty cycle crawler cranes from Liebherr were involved in deep foundation work - two new HS 8100 HD and one older model, type HS 873 HD. All three machines belonging to the Spanish construction company Terratest were equipped with mechanical slurry wall grabs.

The tasks were, on the one hand, to make an access shaft for the later application of a tunnel casing machine and, on the other hand, to erect support walls for the railway, which is partly underground. The total length of the slurry wall in this section was about 1,000 m with depths up to 30 m and a width of 1,200 mm. The soil on the job site, which is in close vicinity to the sea, consisted of alternate layers of sand and gravel.

The machines worked in shifts, Monday to Friday from 06.00 to 24.00 hrs, and erected approximately 1,300 m² of slurry wall each per week. The new duty cycle crawler cranes, type HS 8100 HD, proved to be exceptionally efficient. According to the customer, the diesel consumption of the HS 8100 HD was up to 30 % less than that of a similar machine. This is achieved, above all, through the optimized hydraulic system.

Liebherr Nenzing


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