Retractable hole dilating drill and hole dilating technology

Abstract

The invention provides a retractable hole dilating drill and a hole dilating technology. The retractable hole dilating drill comprises a lifting rotating shaft and a rotary cutting device, wherein the upper end of the lifting rotating shaft is provided with a power connecting joint; the rotary cutting device comprises at least one rotary cutting rocker arm; a rotary cutting knife is arranged on the outer surface of the rotary cutting rocker arm; one end of the rotary cutting rocker arm is hinged to the lifting rotating shaft; an axis of a hinged position is perpendicular to an axis of the lifting rotating shaft; a retractable driving device for driving the rotary cutting rocker arm to rotate around the axis at the hinged position is arranged between the rotary cutting rocker arm and the lifting rotating shaft; and the maximum rotating angle of the rotary cutting rocker arm rotating around the axis at the hinged position is a blunt angle. Area of a portion, which is in contact with soil, of a pile end can be increased further by dilated holes, so that the bearing capacity of a pile foundation is increased further.

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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