Single-axis cement soil mixing pile drill bit

Abstract

The invention discloses a single-axis cement soil mixing pile drill bit which comprises a connector, a drill spindle, tertiary cutter heads, secondary cutter heads and a down-the-hole hammer. The connector is used for being connected with a drill rod of a single-axis cement soil mixing pile machine; the upper end of the drill spindle is connected with the connector; the tertiary cutter heads are arranged along the radial direction of the drill spindle, the cutting radiuses of the tertiary cutter heads are the pile forming radiuses; the secondary cutter heads are arranged along the radial direction of the drill spindle and are positioned below the tertiary cutter heads, and the cutting radiuses of the secondary cutter heads are smaller than the cutting radiuses of the tertiary cutter heads;the down-the-hole hammer is arranged at the lower end of the drill spindle and comprises a down-the-hole hammer impactor and a down-the-hole drill bit. The single-axis cement soil mixing pile drill bit has the advantages that rotational drilling and cutting can be carried out by the down-the-hole drill bit at first when the single-axis cement soil mixing pile drill bit works, the down-the-hole drill bit can be driven by the down-the-hole hammer impactor to carry out axial vibration and impact advancing when the single-axis cement soil mixing pile drill bit is in contact with hard soil layersor hard lumps in settlement drilling procedures, and accordingly resistance can be reduced during drilling and cutting; balanced stress can be applied to the secondary cutter heads and the tertiary cutter heads, the pile position deviation probability can be lowered to a great extent, and accordingly adjacent piles can be completely lapped on one another.

Description

technical field [0001] The invention relates to the technical field of deep mixing, in particular to a single-axis cement-soil mixing pile drill bit. Background technique [0002] Cement-soil mixing piles are widely used in soft soil layers. They use cement slurry as a curing agent, use the mixing pile machine to cut the soil, and at the same time inject cement slurry at the front of the drilling rig at low pressure to fully mix the cement and the chopped soil to form a hard pile. And the cement-soil pile with high water-stopping property. Cement-soil mixing pile machines are mainly divided into single-axis, double-axis and three-axis cement-soil mixing pile machines according to construction machinery and equipment. Usually, two-axis and three-axis cement-soil mixing pile machines occupy a large area, and single-axis cement-soil mixing pile machines The floor area is small, so the applicability of the single-axis cement-soil mixing pile machine is stronger in municipal pro...

AI Technical Summary

Problems solved by technology

[0003] However, in the construction of the current uniaxial cement-soil mixing piles, there is usually the problem of incomplete overlapping of adjacent piles, and water leakage and quicksand phenomenon are prone to occur. The main reason is that the drill bit of the uniaxial cement-soil mixing pile Especially when encountering a hard soil layer area, the drill bit is prone to tilt, and it is biased towards the side where the adjacent piles are occluded, because the occlusal area is actually a softer soil in the stirred area, and the deeper the drill bit sinks, the more obvious this inclination will be. , resulting in the displacement of the pile position and the incomplete overlap of adjacent piles

[0004] Therefore, the problem that the uniaxial cement-soil mixing pile drill bit is prone to tilt when drilling into adjacent piles is a problem that those skilled in the art need to solve

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