Multi-axial pressure cyclone-jet mixing pile driver and method for forming piles using the pile driver

Abstract

The invention discloses a multi-axis air rotary-spaying mixing pile machine and a method for forming a pile by utilizing the pile machine. The pile machine comprises a pile frame (13), a power head (1), at least three stirring shafts (2), a slurry main (3), branched slurry pipes (4), a slurry pump (18), air nozzles (9), an air compressor (10), am air main (11) and branched air pipes (12), wherein the quantity of the stirring shafts (2) is the same as those of the branched slurry pipes (4), the air nozzles (9) and the branched air pipes (12) separately; and each air nozzle (9) communicates with the air compressor (10) through the corresponding branched air pipe (12) and the air main (11). The method comprises the following key step: slurry is sprayed under the action of high-pressure air during drill-down or lifting of the stirring shafts (2) for soil stirring. By adoption of the pile machine and the method, cement soil of the formed pile can be dense and uniform, and the pile forming quality can be good.

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 multi-axial pressure cyclone jet mixing pile driver and a pile forming method 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 fra...

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Problems solved by technology

[0005] There are several defects in the traditional pile driver and the method of using the traditional pile driver to form piles. First, the cement slurry has poor fluidity in the soil and 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 becomes greater, and it is more difficult for the slurry to spread evenly. Therefore, it is more difficult to form a pile in the soil with a greater depth. Therefore, only pile drivers, stirring shafts and stirring heads with the largest model and size can be used. However, this increases the self-weight of the pile driver, the cost of the machine shift increases, and the transportation, installation and movement are more time-consuming, and the economic benefits are poor. Moreover, the increased self-weight requires high bearing capacity of the foundation soil of the construction site. Occasions with poor bearing capacity, such as soft soil, cannot carry heavy-duty pile drivers; moreover, additional crawler cranes are required to insert steel profiles, which further increases the cost of mechanical shifts and labor costs, and the weight of the crawler cranes The requirements for the bearing capacity of the foundation have been further improved. Many sites are difficult to bear the load of the crawler crane and the pile driver at the same time, so the pile driver can only be removed first, and then the crawler crane is driven in, which further increases the labor intensity and reduces the load. efficiency, extended duration

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