Hydraulic down-the-hole hammer

Abstract

The invention discloses a hydraulic down-the-hole hammer. The hydraulic down-the-hole hammer comprises a barrel body, a hydraulic oil inlet pipe, a hydraulic oil return pipe, a hydraulic cylinder, a piston, a piston rod and a fixing block; the barrel body is of a hollow cylindrical structure, and the fixing block in threaded connection with the barrel body is arranged in the barrel body; the top of the fixing block is fixedly connected with the hydraulic cylinder, the piston in sliding connection with the hydraulic cylinder is arranged in the hydraulic cylinder, and the bottom of the piston isfixedly connected with the piston rod; the upper end of the hydraulic cylinder is in communication with the hydraulic oil inlet pipe; and the lower end of the hydraulic cylinder is in communication with the hydraulic oil return pipe. The hydraulic down-the-hole hammer has the advantages that the hydraulic down-the-hole hammer can achieve impacting while rotating, the drilling efficiency is high,drilling and spraying integrated construction can be conducted on a high-resistance stratum and a stratum containing large-particle boulders through a high-spraying method, the hole guiding procedureis omitted, and the drilling and spraying integrated high-spraying construction process can adapt to various complex high-resistance stratums.

Description

technical field [0001] The invention relates to the technical field of high-spray grouting construction equipment, in particular to a hydraulic down-the-hole impactor. Background technique [0002] The high-spray grouting process has the advantages of wide application range, low cost, and mature technology. It has broad application prospects in dams with complex geological conditions and harsh construction environments. The high-jet grouting process is to drill the drill bit carrying the high-pressure nozzle into the ground under the downward pressure while rotating. When the drill pipe reaches the predetermined depth, the high-pressure mud pump is used to spray the cement slurry from the nozzle on the drill bit through the mud pipe. The sprayed cement slurry is mixed with the original formation materials to form a high-sprayed pile body, and several piles are connected together to form an anti-seepage wall. The main problem faced by the traditional high-sprayed construction...

AI Technical Summary

Problems solved by technology

The high-jet grouting process is to drill the drill bit carrying the high-pressure nozzle into the ground under the downward pressure while rotating. When the drill pipe reaches the predetermined depth, the high-pressure mud pump is used to spray the cement slurry from the nozzle on the drill bit through the mud pipe. The sprayed cement slurry is mixed with the original formation materials to form a high-sprayed pile body, and several piles are connected together to form an anti-seepage wall. The main problem faced by the traditional high-sprayed construction is the drilling efficiency problem, especially in high-resistance formations. , it is often impossible to carry out the integrated construction of drilling and spraying, and it is necessary to dispatch special equipment to lead holes, which is slow in work efficiency and high in cost

In order to make the drilling-spraying integrated high-spraying process applicable to a wider range, and to be able to perform drilling-spraying integrated construction on high-resistance formations and formations containing large-particle boulders, the inventor of the present application improved the equipment, initially at the top of the square drill pipe The impact device is installed, but the impact effect is not obvious through many practices. The main reason is: the drill pipe is too long, and the impact force transmitted to the bottom of the drill bit is greatly reduced. Secondly, when the impact device impacts the square drill pipe, the drive drill The mechanism of the rod rotation is vulnerable to impact and has poor safety

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