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Article | REF: C5572 V1

Mini and microtunnelers

Author: Françis MAQUENNEHAN

Publication date: February 10, 2001

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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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