Drilling tool and rotary drilling jig

Abstract

The invention discloses a drilling tool and a rotary drilling jig. The drilling tool comprises an inner drilling tool and an outer drilling tool, wherein the inner drilling tool is sleeved with the outer drilling tool. An inner drill bit is arranged at the bottom of the inner drilling tool, and an outer drill bit is arranged at the bottom of the outer drilling tool. A first torque transmission mechanism connected with a drill rod is arranged on the top of the inner drilling tool. The inner drilling tool is connected with the outer drilling tool through a second torque transmission mechanism. On one hand, the outer drilling tool of the drilling tool has the wall protection effect, on the other hand, the outer drilling tool can cut a soil layer or stones at the bottom of the outer drilling tool, accordingly, it is guaranteed that in the hard stratum drilling process, the outer drilling tool can always follow up the inner drilling tool for burying, the probability of accidents such as collapse is reduced, and production efficiency also can be improved.

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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