Pore-forming construction method by mixing high pressure water with air in long screw pile in high clay layer

Abstract

The invention relates to a pore-forming construction method by mixing high pressure water with air in a long screw pile in a high clay layer, and the pore-forming construction method comprises the following steps: first step, mounting a plurality of paths of central shunts beneath the power head of a long screw pile machine, and mounting a high pressure water conveying pipe with a spray head and an air conveying pipe on the outer side of a long spiral drill pipe; second step, when a drill bit drills to the clay layer, injecting high pressure water into the high pressure water conveying pipe through a high pressure water injection pump, wherein the water flow injected at a high pressure cuts clay between spiral pieces into broken blocks; third step, pressing air into the air conveying pipe through an air compressor; fourth step, forming a water-air-soil mixture at the pile bottom, and the water-air-soil mixture moves upwards to a pile orifice under the rotary thrust of the drill pipe. The construction method provided by the invention is simple and convenient to operate, wide in rock stratum application range, high in pile forming speed and capable of greatly improving the construction speed and efficiency and filling a blank in the pile foundation industry of our country.

Description

technical field [0001] The invention relates to a construction method for building pile foundations, in particular to a construction method for forming holes by mixing high-pressure water and air with long screw piles in high-viscosity soil layers. Background technique [0002] Long auger drilled piles are in particularly viscous soil layers (such as heavy clay, highly weathered argillaceous rock), and the soil drilled by the drill bit is easily adhered between the drill pipe and the helical blade of the drill bit. Under the action of the rotary thrust of the drill pipe, the body cannot move up along the helical sheet, and the soil and the drilling tool will form a long, compact soil column, which will be blocked on the drill bit, resulting in the inability to drill, resulting in the construction of long auger holes. The method cannot be applied to heavy clay and argillaceous rock geology with high degree of weathering. Contents of the invention [0003] The technical pro...

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Problems solved by technology

[0002] Long auger drilled piles are in particularly viscous soil layers (such as heavy clay, highly weathered argillaceous rock), and the soil drilled by the drill bit is easily adhered between the drill pipe and the helical blade of the drill bit. Under the action of the rotary thrust of the drill pipe, the body cannot move up along the helical sheet, and the soil and the drilling tool will form a long, compact soil column, which will be blocked on the drill bit, resulting in the inability to drill, resulting in the construction of long auger holes. The method cannot be applied to heavy clay and highly weathered argillaceous rock geology

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