Cluster-guided down-the-hole hammer drilling tool

Abstract

The invention discloses a beam concentrating type guiding type down-the-hole hammer drilling rig. The beam concentrating type guiding type down-the-hole hammer drilling rig comprises a down-the-hole hammer assembly which comprises an installing barrel; a circle of down-the-hole hammer single bodies are fixed to the inner wall of the installing barrel; the center of the installing barrel is hollowout to form a slag discharging channel; each water supplying hose outlet of the down-the-hole hammer assembly is located in the hammerhead bottom face of the corresponding down-the-hole hammer singlebody; an exhausting port of each down-the-hole hammer single body is also located in the hammerhead bottom face of the down-the-hole hammer single body; the down-the-hole hammer assembly further comprises a slag discharging hose with the bottom stretching into the slag discharging channel; a plurality of correcting devices are arranged on the outer wall of the installing barrel; each correcting device comprises a cylinder; the top of each cylinder is hinged to the outer wall of the installing barrel; an upper connection rod is hinged to the bottom of each cylinder; a lower connection rod is hinged to the lower end of each upper connection rod; and the lower end of each lower connection rod is also hinged to the outer wall of the installing barrel. The drilling rig can be used for reinforcing the rock entering efficiency and enlarging the hole forming hole diameter so as to meet the ultra-large type engineering pile foundation hole forming requirement, the slag discharging efficiency can be improved, dust is avoided, and correcting and guiding can be effectively performed so as to guarantee vertical drilling.

Description

technical field [0001] The invention relates to the technical field of pile foundation hole-forming and rock-entry construction in civil engineering, in particular to a cluster-guided down-the-hole hammer drilling tool. Background technique [0002] At present, in order to strengthen the bearing capacity of pile foundations, bridges, highways, railways, high-rise buildings, etc. in large-scale engineering projects require the bearing layer at the bottom of the pile foundation to penetrate below the weathered bedrock or fresh rock surface, often using down-the-hole hammer drilling tools to enter rock drilled. [0003] The DTH hammer drilling tool in the prior art includes a bracket and a DTH hammer bit. The top of the bracket is provided with a fixed pulley, and the bottom of the bracket is provided with a winch. , The DTH hammer bit is generally a single DTH hammer drill bit. The down-the-hole hammer is a very mature existing technology. It uses an air compressor to delive...

AI Technical Summary

Problems solved by technology

The outer diameter of a single down-the-hole hammer bit is generally 300-400mm, and the single outer diameter of some oversized down-the-hole hammers can even be increased to 2000mm. The diameter of the pile foundation of super high-rise buildings often reaches 2000-5000mm, and the efficiency and hole size of the single down-the-hole hammer bit in the prior art are insufficient, so it is obviously difficult to meet the pile foundation construction requirements of the above-mentioned super-large projects

Moreover, taking a step back, even if the size of the down-the-hole hammer can be expanded to 2000-5000mm, if the size is too large, the resistance encountered when drilling along the circumference of the down-the-hole hammer to each node will inevitably be unbalanced; such as drilling under the clay layer When a certain node in the circumferential direction may encounter floating rocks or boulders, or drill into the inclined interface between the soil layer and the rock layer or the inclined interface between the soft and hard rock layers, the DTH hammer is prone to inclined drilling, which will affect The verticality of the punching hole reduces the quality of the post-forming pile

Moreover, the slagging process of the DTH hammer drilling tools in the prior art mostly adopts the air lift type, that is, the inside of the DTH hammer is provided with an exhaust port. It will be discharged to the bottom of the hole through the exhaust port, and the generated reaction force will lift the residue at the bottom of the hole out of the hole. However, the above-mentioned gas lift cycle will generate a large amount of dust, pollute the air, and damage the health of the operator. The slag efficiency is not ideal, the speed is slow, and the amount of slag discharge is small, and further hole cleaning is required

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