Diameter variable double high-pressure stir-spray pile and diameter variable method thereof

Abstract

The invention relates to a diameter variable double high-pressure stir-spray pile and a diameter variable method thereof. The diameter variable double high-pressure stir-spray pile and a diameter variable method thereof are used for carrying out corresponding structural improvement on a drill bit and stirring blades of the drill bit, and the diameter variation of the drill bit is realized througha sleeve pipe and an elastic connecting rod structure so as to realize on-site adjustment of the radius of a formed pile without disassembling and replacing the drill bit. On the basis of improving the operation efficiency and shortening the adjustment of diameter variation, the stability of the drill bit and a drill pipe connection structure is ensured. The diameter variable double high-pressurestir-spray pile comprises a drill pipe and the drill bit connected to the end of the drill pipe; a high-pressure gas pipe and a high-pressure cement slurry pipe communicate with the inner parts of thedrill pipe and the drill bit; at least two layers of stirring blades are arranged on the periphery of the drill bit, and air outlet holes and / or slurry outlet holes are formed below each layer of stirring blades; the drill bit is provided with an outer sleeve pipe connected with the drill pipe, and an end head is connected to the end of the outer sleeve pipe; the stirring blades are provided withhinged connecting rods and diameter variable rods; and the ends of the diameter variable rods are fixedly connected with the outer sleeve pipe, and a vertical transmission mechanism inside the outersleeve pipe is movably connected to the ends of the connecting rods.

Description

technical field [0001] The invention relates to a double-high-pressure mixing and jetting pile whose diameter can be changed without disassembling or replacing a drill bit and a diameter changing method thereof, belonging to the technical field of civil engineering. Background technique [0002] At present, there are many types of dual high-pressure grouting piles used in excavation construction sites in underground spaces, such as subways, underground parking lots, supermarkets or pedestrian passages. The dual high-pressure grouting pile adopts the method of mixing high-pressure gas and high-pressure cement slurry, accompanying and participating in the cutting and stirring of the mixing blade during the excavation of the drill bit, so as to realize the uniform fusion of soil and cement slurry, and realize the rapid cement and soil mixing. Fusion, which can significantly improve the strength of the grouting pile. [0003] Due to the harsh and complex site conditions of deep...

AI Technical Summary

Problems solved by technology

The current dual-high-pressure spraying piles can only be solved by stopping the operation for a long time and replacing the drill bit, which is time-consuming and laborious, increasing the difficulty of operation and adjustment of on-site operations, and is not conducive to the connection of the spraying pile itself. The stability of the structure may sometimes cause the drill bit to fall off accidentally

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