Karst stratum rotary drilling anti-deviation drilling tool and drilling method thereof

Abstract

The invention discloses a karst stratum rotary drilling anti-deviation drilling tool and a drilling method thereof, and relates to the technical field of rotary drilling. The karst stratum rotary drilling anti-deviation drilling tool comprises a verticality keeping barrel, a rotary drilling bit, a connecting pin, a bit fishing plate and a reinforcing assembly, wherein the rotary drilling bit comprises a drilling slag barrel and a bit square sleeve arranged in the middle of the top end of the drilling slag barrel, and the bit square sleeve is provided with a first connecting pin hole; the drillbit square sleeve is used for being connected with a rotary drilling rod through a connecting pin, the verticality keeping barrel is fixed to the upper end of the drilling slag barrel, the verticality keeping barrel and the drilling slag barrel are fixedly connected with the reinforcing assembly, and a working hole is formed in the lower end of the side wall of the verticality-keeping barrel andcorresponds to the first connecting pin hole in position; and the bit fishing plate is arranged at the top of the verticality keeping barrel and is an annular steel plate, and an annular protrusion extending downwards is arranged on the inner edge of the annular steel plate. The karst stratum rotary drilling anti-deviation drilling tool and the drilling method are suitable for being applied to drilling of seriously uneven stratums such as karst development areas or foundation pit supporting and piling construction, and the drilling perpendicularity can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of rotary drilling, in particular to an anti-deviation drilling tool for rotary drilling in karst formations and a drilling method. Background technique [0002] Drilling rigs are the most commonly used drilling equipment for forming holes in pile foundations. The dredging bits, sand digging bits, and rock-breaking barrel drills used in rotary drilling rigs are barrel-type bits with a height of 1-1.5m. In uniform strata such as sand layers, the drilling can maintain a good verticality. In the karst development area, the fractures are developed and the caves are of different sizes, resulting in extremely uneven strata. >1%H, H is the hole depth), the inclined pile will reduce the vertical and horizontal bearing capacity of the foundation pile. [0003] During the construction of foundation pit support row piles, the distance between adjacent support piles is very small (generally 20-40cm), and high-pressu...

AI Technical Summary

Problems solved by technology

[0003] During the construction of foundation pit support row piles, the distance between adjacent support piles is very small (generally 20-40cm), and high-pressure rotary jetting piles are often arranged between the support piles. Do not exceed the standard (<1% H, H is the hole depth), when the support pile is drilled, it is easy to damage the adjacent pile or the water-stop curtain cannot be drilled to the design depth

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