A drill-expansion combination drill bit

Abstract

The invention discloses a drilling and reaming combined drill, which comprises a hollow rod body, a plurality of cutter bodies, reamer rods, lower blades, an oil cylinder and an upper blades, wherein the cutter bodies are respectively and fixedly arranged on the lower blades; the lower blades are respectively provided with a peripheral face horizontally, radially, uniformly and fixedly distributed at the lower part of the hollow rod body; the reamer rods are respectively located above the lower blades and are symmetrically arranged along the radial direction of the hollow rod body; swing rods are respectively and pivotally arranged on pin bosses on the peripheral face of the hollow rod body by using hinge pins; short arms of the swing rods pass through a straight slot on the wall of the hollow rod body; and an end elongated kidney slot in the hole of the hollow rod body is hinged on a coupling fork at the end part of a piston rod of the oil cylinder through a hinge pin. As a combined type drilling and tunneling structure is adopted by the drilling and reaming combined drill disclosed by the invention, except that a function drilling and tunneling common straight holes can be realized, when an under-reaming operation or a reaming operation is needed, the reamer rods are opened through operating the oil cylinder, and therefore, the pile tip and the pile body of a bearing pile are increased in cross-sectional area. The drilling and reaming combined drill can be used for constructing various under-reamed piles and calabash piles and has the outstanding features that the construction is convenient, the operation is simple and the construction period is short.

Description

technical field [0001] The invention belongs to a drill bit for construction in the construction industry, and in particular relates to a drilling-expanding combination drill bit. Background technique [0002] With the development of high-rise buildings, large bridges, urban subways and river embankments, new load-bearing piles such as various bottom expansion piles and gourd piles have been widely used, and the construction of these load-bearing piles will use prefabricated piles combined with drilling and grouting The construction process of piling is to use the integrated drilling tool with drilling and reaming functions to drill holes, ream the straight holes according to a certain distance according to the design requirements, and use the auger drill pipe to discharge the soil after drilling, and then put it into the Concrete is poured into the pile, and after the concrete is fully solidified, it is combined with prefabricated piles to form expanded bottom piles and gou...

AI Technical Summary

Problems solved by technology

At present, there is no drilling and reaming combination drill bit with this function. If the hole reaming operation is required, the drill pipe must be lifted and replaced with a reaming drill bit, which will affect the construction progress and project quality.

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