Long spiral drilling and percussion drilling dual-machine composite pore-forming grouting pile construction method

Abstract

The invention discloses a long spiral drilling and percussion drilling dual-machine composite pore-forming grouting pile construction method. The method comprises the following steps of (1) construction preparation, (2) long spiral drilling primary pore forming, (3) percussion drilling machine secondary chambering and rock entering, (4) the from-inside-to-outside one-spiral multi-percussion dual-machine joint construction technology, and (5) reinforcement cage placement and concrete pouring. According to the method, under the condition of guaranteeing the pore-forming quality, the pore-forming efficiency and rock-entering depth are greatly improved through the construction technology, and the construction efficiency is greatly improved; spiral and percussion composite construction is achieved, the noise and vibration duration is short, and the phenomena of pile breaking, virtual piles, necking down, hole collapse and repeated construction are avoided; and several devices carry out construction at the same time, the foundation treatment speed is increased, a user can use a foundation in advance, and social and environment protection benefits are remarkable.

Description

technical field [0001] The invention relates to a construction method of a long auger drill and a percussion drill dual-machine composite hole-forming cast-in-situ pile, belonging to the technical field of building construction. Background technique [0002] Bored pile refers to the pile foundation formed by forming a pile hole in the foundation soil by means of mechanical drilling, punching, steel pipe extrusion or manual excavation on the project site, and placing a steel cage in it and pouring concrete. Bored piles are widely used in engineering projects with poor geological conditions due to their mature construction technology, high bearing capacity, and few restrictions on use. [0003] However, from the perspective of the traditional construction technology of cast-in-place piles, the single mechanical hole-forming process either has low hole-forming efficiency or shallow depth of penetration into the rock. Therefore, a single pile-forming machine generally has a cer...

AI Technical Summary

Problems solved by technology

It not only solves a series of problems such as the small diameter of the hole drilled by the auger drill, the shallow depth of the rock, and the easy plugging of the pouring concrete, but also solves the problems of the hole wall collapse and the slow hole formation speed during the drilling process.

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