Reamer bit for building long-screw pile machine

Abstract

The invention discloses a reamer bit for a building long-screw pile machine. The reamer bit comprises a drill pipe, the lower end of the drill pipe is fixedly connected with a drill tip, screw blades are fixedly connected on the outer wall of the drill pipe, the lower end portions of the screw blades are linked with reaming devices, and power driving devices capable of driving the reaming devices to be opened or closed are arranged on the screw blades. By adopting the technical scheme, the reamer bit for the building long-screw pile machine integrates functions of hole drilling, hole cleaning, hole reaming and slip casting, pile hole working can be completed through one-time drilling, and the reamer bit is high in pile-forming quality, reasonable in structure and convenient to use.

Description

technical field [0001] The invention relates to a component of a construction screw pile machine, in particular to a construction long [0002] Reaming drill bit for screw pile driver. Background technique [0003] At present, reinforced concrete bored piles are mostly used for the foundation of high-rise or large buildings, and long screw piles are mostly used in the construction process to drill equal-diameter piles, and the bearing capacity of the equal-diameter piles is poor. For increasing the bearing capacity of the pile, people have thought of enlarging the appropriate position of the pile hole into a cone, but the existing drilling drill bit can not meet the requirements of construction. [0004] Publication number is that the Chinese invention patent of CN2092595U discloses a kind of rock reaming bit, comprises drill bit body, fixed cutting tool, centering bit, arbor, and there is reaming tool on the bit body, and one end of reaming tool is fixed on with hinge and ...

AI Technical Summary

Problems solved by technology

This structure satisfies the function of increasing the cross-sectional area of ​​the bottom of the pile body. Compared with the straight pile, the pile body can be made firmer, but there are some shortcomings due to structural reasons: 1. The oil cylinder is set in the steel pipe, so only cement or For the filling of other fluid slurry, if the concrete slurry is filled, the concrete is difficult to pass through, then after the filled concrete slurry enters the steel pipe, the oil cylinder cannot expand outward due to the existence of sand and gravel, and the oil cylinder is filling the concrete slurry. 2. When the drill bit is drilling down, mud and sand are easy to enter the steel pipe, blocking the whereabouts of the cement slurry and making it impossible to pour; 3. The drill bit for bottom expansion is two pieces Shaped reaming drill tip, because it only relies on working oil

[0007] The cylinder is supported and driven without other fixing measures. Obviously, the strength of its structure can only be applied and constructed in an environment with soft soil, and it is difficult to use in an environment with hard soil or geology. If it is used, it is very easy to damage, and the construction cannot be guaranteed. normal request

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