Magnetic card type fishing method for drill dropping during rotary drilling of large-diameter cast-in-place pile
A cast-in-situ pile and large-diameter technology, which is applied in the direction of earthwork drilling, wellbore/well parts, etc., can solve the problem that the drill pipe cannot be salvaged, and achieve the effect of low cost, fast production speed and simple structure
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] In the drawings of this embodiment, the same or similar symbols correspond to the same or similar components; The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. Construction and operation, so the words describing the positional relationship in the drawings are only for illustrative...
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