Drilling bit and rotary drilling rig

Abstract

The invention discloses a drilling bit and a rotary drilling rig, and relates to the field of building machines, which can use a piston door to push soil downward from the top of the drilling bit so as to pour soil, and can improve the construction efficiency of the rotary drilling rig in a cohesive soil layer. The technical scheme of the invention is that the drilling bit includes a piston door having a connection rod and a circular plate; convex keys are arranged on the outer side of circular plate; the piston door is arranged in a barrel; the barrel includes a connection zone, a first guide rail zone, a horizontal guide rail zone and a second guide rail zone which are successively connected; groove guide rails matching the convex keys of the piston door are arranged on the barrel; a circular top door is connected to an inner wall of the connection zone; a bottom door is arranged on the bottom of the barrel; during drilling, soil can enter the barrel via the bottom door; and while the soil is poured, the barrel is fixed through the circular door, the bottom door on the bottom of the barrel is opened, the piston door is moved from a starting end of the second guide rail zone to the tail end of the guide rail, and the soil in the barrel is poured. The soil pouring operation is simple and convenient, and the construction efficiency of the rotary drilling rig in the cohesive soil layer can be improved.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a drill bit and a rotary drilling machine. Background technique [0002] Rotary drilling rig is a construction machine suitable for hole-forming operations in building foundation engineering. It is mainly suitable for the construction of sandy soil, cohesive soil, silty soil and other soil layers, and is widely used in various foundation constructions such as cast-in-place piles, diaphragm walls, and foundation reinforcement. [0003] When the rotary drilling rig is used in the construction of small-diameter cast-in-place piles (pile diameter ≤ 600mm) in the cohesive soil layer, the commonly used drills include: dredging drill bit, rotary bucket (also called hole cleaning drill bit), open body drill bit (also called two-petal drill bit) drill bit), flat auger bit, etc. Because the friction force between the soil and the drill bit and the cohesive force of the soil itself a...

AI Technical Summary

Problems solved by technology

Due to the relatively large friction between the soil and the drill bit and the cohesive force of the soil itself, the excavated soil and the drill bit are tightly stuck together, and it is difficult to pour the soil and it takes a long time.

When the existing rotary drilling rig encounters cohesive soil, it will be difficult to pour the soil if the footage is too large, so the method of drilling at the expense of the depth of a single footage has to be adopted

This drilling method greatly reduces the construction efficiency, seriously blocks the advantages of high construction efficiency of the rotary drilling rig, and often produces harsh noise pollution

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