A method of large-diameter pile hole operation

Abstract

The invention discloses an efficient pollution-free large-diameter pile hole operation construction method, which comprises the following steps of: in a hole forming position, firstly using a vibration hammer to press a wall protection pipe into a covering layer till reaching the rock position, and dismounting the vibration hammer; putting a rotary drilling rig in a proper position, using a conventional rotary drilling drill bit for digging out the loose and soft covering layer out of the wall protection pipe, and cleaning the remaining covering layer in a hole till reaching the rock position; replacing a special clustered DTH (Down-The-Hole) hammer of the rotary drilling rig, and performing entering-rock operation until a pile hole meets the pile hole dimension requirement; taking out the special clustered DTH hammer, and performing subsequent pile hole work such as steel bar cage feeding and grouting; and using the vibration hammer or a pipe extractor to take out the wall protection pipe to complete the pile hole construction. The special clustered DTH hammer comprises a tubular hammer body, wherein a plurality of sub hammers capable of being driven by gas are arranged inside the tubular hammer body; a drill bit is arranged at the bottom of each sub hammer; and the plurality of sub hammers surround the center of the tubular hammer and are distributed according to different circumferences. The method has the advantages that the operation time is greatly shortened; and the operation efficiency is much higher than that of a conventional construction method.

Description

technical field [0001] The invention relates to a pile hole operation method, in particular to an efficient and pollution-free large-diameter pile hole operation method and a special cluster type down-the-hole hammer, belonging to the technical field of drilling methods. Background technique [0002] At present, in the construction of large-diameter pile holes (above 600mm), most of them use long auger drilling rigs, rotary drilling rigs, hand-operated impact drills, etc. Due to the limitation of operation methods, long auger drilling rigs and rotary drilling rigs are used in soft covering layers and softer rock layers. The efficiency is high, but the efficiency is poor on hard rock, especially granite with high strength. Most domestic hard rock operations are performed by hand-operated impact drills, which are inefficient. Generally, it takes several days to ten days to form holes. For several days, and when the overburden is soft and the rock layer is hard, the three opera...

AI Technical Summary

Problems solved by technology

[0003] The problem to be solved by the present invention is to provide an efficient and pollution-free large-diameter pile hole operation method for the disadvantages of the current work, using rotary drilling drills, and using different equipment for different geology, effectively improving the hole-forming speed, and through follow-up The wall is protected by the pipe without using mud to protect the wall, and there is no mud pollution to the environment

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