Extended reaming drill bit and reaming process

Abstract

The extended reaming drill bit and the reaming process, wherein the drill bit includes: a lifting rotating shaft, the upper end of which is set as a power connection joint; a rotary cutting device, including at least one rotary cutting arm, and a rotary cutting knife is arranged on the outer surface of the rotary cutting arm; One end of the cutting arm is hinged on the lifting rotating shaft, the axis of the hinge is perpendicular to the axis of the lifting rotating shaft, and there is a telescoping device between the rotating cutting arm and the lifting rotating shaft to drive the rotating cutting arm to rotate around the axis of the hinge. A driving device; the maximum angle at which the rotary arm rotates around the axis at the hinge is an obtuse angle. The expanded holes can further increase the contact area between the pile end and the soil, thereby further increasing the bearing capacity of the pile foundation.

Description

technical field [0001] The invention relates to a reaming drill bit and a hole reaming process used in building construction sites, in particular to a reaming drill bit and a hole reaming process for reaming the bottom of an original preformed hole. Background technique [0002] Pile foundation engineering is one of the important components in the field of civil engineering. At present, the commonly used engineering pile forms mainly include prefabricated piles and cast-in-situ piles. Prefabricated piles include steel pipe piles, prefabricated square piles, PHC pipe piles, prestressed hollow Square piles and other forms, which are characterized by prefabricating engineering piles and placing them into the soil, and using the joint action of piles and soil to provide compression, pullout, bending or horizontal bearing capacity. Cast-in-place piles include bored piles, cast-in-place piles and other forms, which are characterized by pre-forming holes in the rock and soil, and t...

AI Technical Summary

Problems solved by technology

[0003] But because the method that existing cast-in-situ pile improves bearing capacity is to enlarge pile tip and soil body contact area, methods such as drilling deep hole increase soil body to the frictional force of pile body to realize, and reaming drill is also to expand umbrella-shaped pile tip, The increased bearing capacity is limited and cannot meet the requirements of the required pile foundation bearing capacity

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