E - Fixed Constructions – 02 – F
Patent
E - Fixed Constructions
02
F
E02F 5/18 (2006.01) E02F 9/20 (2006.01) E02F 9/26 (2006.01) E21B 7/04 (2006.01) E21B 44/00 (2006.01) E21B 47/022 (2006.01) G01S 11/00 (2006.01)
Patent
CA 2250666
The position of a boring head (16) during boring operation in the vicinity of an existing utility conveyance (22) that radiates a locating signal can be determined by establishing the ratio of the strength of the locating signal of the cable induced in the boring head to the strength of the locating signal on the conveyance. Should the ratio exceed a prescribed value, indicating that the boring head is too close to the existing conveyance, then an alert is generated. Advantageously, the position of the boring head during a boring operation may be controlled in feed-back loop fashion in accordance with the ratio to maintain the boring head substantially parallel to the existing conveyance.
La position d'une tête de forage (16) durant une opérationde forage au voisinage d'un tubage utilitaire existant (22) qui émet un signal de localisation peut être déterminée si l'on établit le rapport entre la puissance du signal de localisation du câble induit dans la tête de forage et la puissance du signal de localisation sur le tubage. Si le rapport excède une valeur spécifiée, indiquant que la tête de forage est trop près du tubage existant, alors une alarme est déclenchée. Avantageusement, la position de la tête de forage durant une opération de forage peut être commandée en mode boucle de rétroaction en fonction du rapport obtenu de manière à maintenir la tête de forage substantiellement parallèle au tubage existant.
Eslambolchi Hossein
Huffman John Sinclair
At&t Corp.
Kirby Eades Gale Baker
LandOfFree
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