4. Limits to the use of the technique
4.1 Lengths
The maximum distances between two working shafts (drive lengths) are :
100 m for diameters between 400 mm and 800 mm ;
200 m for diameters > 800 mm with intermediate push stations.
Above a certain diameter (> 1,200 mm), there is no precise limit to the length of a drive. A few companies claim to have built drives longer than 500 m.
The maximum distance between two wells depends on :
of the admissible thrust limit of the tubes (table 1...
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Limits to the use of the technique
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