CHOICE of a LOADING - TRANSPORT SYSTEM ( Load and haul )

   After preliminary studies it is also necessary to combine the different loading and transport techniques in order to obtain the system which presents the best compromise " price - operating constraints" and in particular the environmental constraints. This choice is defined on the basis of the following parameters:  

• Nature and hardness of the materials to be extracted 
• Production to be ensured
• Transport distance 
• Need to crush the materials before their recovery for further processing 
• Opportunity to create stocks (marketable materials, ores , topsoil) or fill (waste)  

Although there are many combinations that can optimize the rolling load function we will describe as an example, the most common and especially those that use the most frequently encountered materials:
a) Hard materials slaughtered at l explosive


Distances less than 200 m. - Low or medium flow

The loading machine, also carries the transport. In this configuration a suitably calculated wheel loader provides these two functions.
This solution is widely used in quarry aggregates when it is equipped with a mobile crusher or it is to build stocks of aggregates all coming.
The wheel loader has the advantage of its mobility and its fast speed of travel which can reach 25 km/ h under load. It can virtually adapt to all driving conditions.

The economically profitable use of a loader used in loading - transport is below 150 to 200 m. depending on the driving conditions.
When the materials of the track are sharp tire wear is important and the profitability of such transport decreases rapidly. It is the same if the track is in bad condition because number of rotations / hour decreases. To improve track stability in poor condition most modern machines are equipped with an anti-pitching system. However, it is worth remembering that obtaining a good cost price is inseparable from the good maintenance of the slopes.  

Distances greater than 200 m. but less than 2000 m.

 This diagram represents the most common configuration for medium to large flows. On a rough terrain with slopes not exceeding 8 to 10%, rigid dump trucks will be chosen which are more economical to buy and less expensive to maintain than articulated haulers. These funds will be reserved for TP construction sites in muddy or hilly terrain or the exploitation of gravel pits in unstable terrain with low traction

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