Drilling Tools and Rotary Drilling Rigs

Abstract

The invention discloses a drilling tool and a rotary drilling machine. The above-mentioned drilling tool includes: an inner drilling tool, and an outer drilling tool sleeved on the periphery of the inner drilling tool; the bottom of the inner drilling tool is provided with an inner drill bit, and the bottom of the outer drilling tool is provided with an outer drill bit; The top of the inner drilling tool is provided with a first torsion transmission mechanism for connecting with the drill rod; the inner drilling tool and the outer drilling tool are connected through a second torsion transmission mechanism. On the one hand, the outer drilling tool of the above-mentioned drilling tool plays the role of protecting the wall; on the other hand, it can cut the soil layer or stone at the bottom of the outer drilling tool, so as to ensure that the outer drilling tool can always follow up during the drilling process of hard ground The internal drilling tools are buried, thereby reducing the probability of accidents such as landslides, and can also improve production efficiency.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a drilling tool and a rotary drilling machine. Background technique [0002] Rotary drilling rig is a kind of construction machine used for hole forming in construction foundation engineering. It is mainly suitable for the construction of sandy soil, cohesive soil, silty soil and other soil layers. It is widely used in foundation construction. [0003] When the rotary drilling rig is working in unstable strata, it usually adopts the method of drilling with the pipe. The so-called drilling with the pipe refers to the drilling method in which the casing is installed outside the drill bit, and the casing is lowered while drilling. . Adopting the above method can prevent landslides and improve construction efficiency. [0004] For the case where the lower part of the casing is a soft layer such as a soil layer or a sand layer, during the drilling process using the method of fo...

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Problems solved by technology

[0004] For the case where the lower part of the casing is a soft layer such as a soil layer or a sand layer, during the drilling process using the method of follow-up drilling, the casing can follow the burial of the drilling tool depending on the pressure and torque; however, for the lower end of the casing that is In the case of a hard layer or a part of the stone in the hole and a part outside the hole, because the diameter of the drill bit in the casing is smaller than the inner diameter of the casing, it is difficult to remove the stone at the lower end of the casing, and the casing cannot be buried with the drilling tool, nor can it be buried. Play the role of retaining wall, which is easy to cause accidents such as landslides

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