Double-shaft air-injection rotary jet type stirring pile machine and method for forming pile by using pile machine

Abstract

The invention discloses a double-shaft air-injection rotary jet type stirring pile machine and a method for forming a pile by using the pile machine. The pile machine disclosed by the invention comprises a pile frame, a power head (1), a stirring shaft (2), an air nozzle (9), an air compressor (10), an air transmission header pipe (11) and an air transmission branched pipe (12); a slurry nozzle (8) and the air nozzle (9) are fixed on a stirring head (7); the air nozzle (9) is arranged outside the slurry nozzle (8) in a sleeving manner; the air nozzle (9) is communicated with the air transmission branched pipe (12); the air transmission branched pipe (12) is communicated with the air transmission header pipe (11) and the air compressor (10). The construction method provided by the invention comprise the key step of spraying slurry under coercing of high-pressure air while drilling through a stirring shaft (2) or lifting upwardly and stirring a soil body. Due to the pile machine and the method for forming the pile by utilizing the pile machine, which are disclosed by the invention, piled cemented soil is uniform in density and good in pile-forming quality; the pile-forming depth can be increased; furthermore, a pile can be formed in a soil body with relatively high hardness; in addition, the construction efficiency is improved; the time limit for a project is shortened; the machine-shift cost and the labour cost are saved.

Description

technical field [0001] The invention relates to the construction technology of cement mixing piles in the field of civil engineering, in particular to a biaxial pressure cyclone jet mixing pile driver and a method for forming piles by using the pile driver. Background technique [0002] With the rapid development of the country's economic construction, especially the widespread rise of housing construction and municipal construction, the construction technology of cement mixing piles is also constantly being developed and applied. Cement mixing piles are mostly used for foundation reinforcement or as support structures and water-stop curtains in foundation pit support systems. [0003] The traditional cement mixing pile machine includes a pile frame, a power head, two parallel stirring shafts (that is, double stirring shafts), a main slurry delivery pipe, two slurry delivery sub-pipes, a slurry delivery pump and a slurry mixer. The power head is installed on the pile On the...

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Problems solved by technology

[0005] There is a big defect in the traditional pile driver and the method of using the traditional pile driver to form a pile, that is, the fluidity of the cement slurry in the soil is poor, and it is difficult to spread evenly, so that a large amount of cement slurry accumulates near the spray nozzle, and the slurry at a slightly farther position The quantity is seriously insufficient, and the grout nozzle is easily blocked by crushed soil, which naturally leads to the lack of cement slurry in the soil, so after stirring, the cement soil of the pile body is not dense and uneven, which seriously reduces the quality of the pile; moreover, as the soil layer As the depth increases, the hardness of the soil increases, and the slurry is difficult to spread evenly. Therefore, it is difficult to form a pile in a soil with a large depth. In a larger soil body, it is more difficult for the slurry to spread evenly, so it is naturally impossible to form a pile; also due to the poor fluidity of the slurry in the soil, in this way, the sprayed slurry cannot be diffused during the drilling of the stirring shaft, so the only way to drill down first is to remove the pile. The method of spraying grout when the soil is drilled loose and then the stirring shaft is lifted up. In this way, two sinking and two pulling are required to form a pile. The construction efficiency is low, the construction period is long, the cost of mechanical shifts and labor is high, and the economic benefit is poor.

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