Construction method capable of causing pilot hole to pass through large-area drifting sand layer through shaft counter-drilling method
A construction method and pilot hole technology, applied in drilling equipment and methods, shaft equipment, wellbore/well components, etc., can solve problems such as high safety risks, hole wall collapse, slow construction, etc., to reduce disturbance and save costs , The effect of low construction cost
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[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0029] In order to make the above objectives, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0030] The invention provides a construction method for a pilot hole of a vertical shaft raise method over a large area quicksand layer, which comprises the following steps:
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