Method and apparatus for directional boring
First Claim
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1. Method for directional boring, the method comprising boring into the earth with a boring apparatus, the boring apparatus comprising:
- a drill string;
a rotary drive driveably engaged with the drill string;
a thrust drive driveably engaged with the drill string;
at least one excavating tool connected to the drill string, arranged eccentrically to the drilling axis, and a vibrator engaged with the drill string;
whereby for straight-ahead boring the rotary drive is activated whereby the at least one excavating tool moves on a circular orbit, and for boring along a curve the rotary drive is deactivated whereby the at least one excavating tool is stationary, and the vibrator is activated.
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Abstract
In directional boring using a boring apparatus having a driven string and a drill head with an excavating tool moving in an orbit about the longitudinal axis of the string, the tool moves with substantially constant angular velocity when boring straight ahead, but when boring along a curve it is stopped and set in vibration in order to obtain more accurate control of the curve.
27 Citations
10 Claims
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1. Method for directional boring, the method comprising boring into the earth with a boring apparatus, the boring apparatus comprising:
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a drill string;
a rotary drive driveably engaged with the drill string;
a thrust drive driveably engaged with the drill string;
at least one excavating tool connected to the drill string, arranged eccentrically to the drilling axis, and a vibrator engaged with the drill string;
whereby for straight-ahead boring the rotary drive is activated whereby the at least one excavating tool moves on a circular orbit, and for boring along a curve the rotary drive is deactivated whereby the at least one excavating tool is stationary, and the vibrator is activated.- View Dependent Claims (2)
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3. Apparatus for directional boring, comprising:
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a drill string;
a rotary drive driveably engaged with the drill string;
a thrust drive driveably engaged with the drill string;
at least one excavating tool connected to the drill string, arranged eccentrically to the drilling axis such that when the rotary drive is activated the at least one excavating tool moves in a circular orbit whereby the apparatus bores straight-ahead, and when the rotary drive is deactivated the at least one excavating tool is stationary whereby the apparatus bores along a curve, and a vibrator engaged with the drill string. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification