Immersed tube cement mixing pile, construction process and immersed tube device

Abstract

The invention discloses an immersed tube cement mixing pile, a construction process and an immersed tube device. The immersed tube device comprises an immersed tube and a grouting tube, wherein the immersed tube comprises an inner tube and an outer tube; the upper end of the inner tube is flush with the upper end of the outer tube; the bottom end of the inner tube is higher than the bottom end ofthe outer tube; the bottom end of the inner tube is connected with the bottom end of the outer tube through a conical sealing plate; an annular supporting plate is further arranged between the inner tube and the outer tube; a mounting hole is formed in the annular supporting plate; the grouting tube is arranged between the inner tube and the outer tube of the immersed tube through the mounting hole; and a 90-degree elbow is arranged at the lower end of the grouting tube. A mixed soil body and cement grout are limited in the immersed tube through the double-layer immersed tube, so that the mixed soil body and the cement grout can be fully and uniformly mixed; and secondly, after a mixing pile body is constructed, the grouting tube is used for grouting the pile body and a peripheral soil body interface in the process of pulling out the immersed tube, so that the quality uniformity of the cement mixing pile body is improved, the compressive strength of the cement mixing pile body is enhanced, the frictional resistance and the end resistance of the pile body are improved, and the bearing capacity of the cement mixing pile can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of foundation engineering, and relates to an immersed tube cement-soil mixing pile, a construction process and an immersed tube device. Background technique [0002] Cement-soil mixing piles are often used to reinforce foundation soil layers with high water content and low foundation bearing capacity, including silt, muddy soil, silt soil, sandy soil, peat soil, etc. As a curing agent, the soft soil within a certain depth and the curing agent are forcibly stirred and mixed in situ by using special mixing equipment, and a series of physical and chemical reactions between the reinforced soil and the curing agent make the soil harden into a solid state. High-quality piles with integrity, water stability and certain strength, so as to achieve the purpose of improving the foundation. Compared with concrete pouring piles, cement-soil mixing piles have the characteristics of saving materials and simple constructio...

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Problems solved by technology

[0003] However, there is a big defect in the cement-soil pile, which is that its vertical compressive bearing capacity is low, the strength of the pile body is uneven, the difference between different parts is large, and even the phenomenon of pile breakage is caused. During the construction process, the injected cement slurry is mixed unevenly with the stirred soil, and the cement slurry escapes and escapes.

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