Construction method of cement mixing pile in saline-alkaline silt soft foundation

Abstract

The invention relates to the technical field of formation of cement mixing piles and discloses a saline alkali muddy soil ground cement mixing pile construction method which comprises the following steps: S1, flattening a to-be-constructed field; S2, conveying a mixing pile machine to the to-be-constructed field, locating and aligning according to set pile positions and well connecting a slurry conveying pump; S3, starting the mixing pile machine and sinking and mixing for the first time; S4, guniting, elevating and mixing for the first time; S5, repeatedly sinking and mixing, namely sinking and mixing to pile bottoms, wherein the sinking speed of a drill bit is 0.3-0.6m / mine; S6, repeatedly guniting, elevating and mixing; S7, sinking and mixing for the third time; S8, elevating and mixing for the third time; and S9, closing the mixing pile machine, moving the complete machine to the specified pile position of the next pile, and repeating all of the previous operations, thereby achieving a next mixing pile. A twice-spraying and six-mixing construction method is adopted, so that use of cement resources is reduced and the construction cost is lowered.

Description

Technical field [0001] The invention relates to the technical field of cement mixing pile forming piles, in particular to a construction method of a salt-alkaline silt soft foundation cement mixing pile. Background technique [0002] The soft soil foundation treatment in the construction foundation project is a key link to ensure the quality of the project, and it occupies a large proportion of the total project price. A large number of engineering practices have shown that the cement-soil mixing pile method has the advantages of simple construction, rapid construction, and low vibration, which can effectively improve the stability of soft soil foundations and reduce and control settlement. Cement-soil mixing piles have now been developed as a commonly used method for soft foundation treatment, which is mainly suitable for strengthening saturated soft clay foundations. Specifically, it uses a pile mixer to pump cement (or lime) and other curing agents into the soft soil, and mix...

AI Technical Summary

Problems solved by technology

Due to the great difference between the actual geological conditions and the geological description of the design drawings, some sections are even all saline-alkaline soft and fluid silt, and there are loose sandy soil layers and silty clay layers, which is extremely complicated. Therefore, in the early stage The cement-soil strength of the pile body and the bearing capacity of the composite foundation of the technical test piles constructed by "two sprays and two stirs" and "two sprays and four stirs" failed to meet the design requirements, and only the construction method of "three stirs and six sprays" could meet the requirements. requirements, but the construction method of three stirring and six spraying needs to consume huge cement resources, and the project cost is high

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