Foundation treatment method and foundation treatment structure

Abstract

The invention relates to a foundation treatment method and a foundation treatment structure. The foundation treatment method comprises the following steps: consolidating the foundation by using a cement pile of which the diameter is 50 cm to 120 cm and the length is 3 m to 5m; and quickly constructing a gravel pile or a sand pile at the central position of the cement pile within 12 to 72 hours after the cement pile is formed and before the cement is completely solidified, wherein the diameter of the gravel pile or the sand pile is at least 10 cm smaller than the diameter of the cement pile; the gravel pile or the sand pile is 6 m to 25 m in length; and the gravel pile or the sand pile adopts soil-extrusion hole formation construction. According to the foundation treatment method provided by the invention, the cement is combined with the gravel pile or the sand pile in application, so the foundation treatment method achieves good environmental protection property, liquefaction resistance, high adaptability, convenience in construction, good economical efficiency and high foundation strength.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a ground treatment method and structure. Background technique [0002] Ground treatment includes four major mechanisms of displacement, compaction, consolidation (chemical consolidation, drainage consolidation) and foundation piles. Various ground treatment methods are derived from these four mechanisms alone or in combination. [0003] The most common cement-soil piles are cement powder spray piles or cement slurry mixing piles. The defect of this pile is that along the length of the pile body, the distribution of cement and soil in the upper and lower parts is uneven, that is, the amount of cement powder or cement in the upper 2 to 4 meters. The amount of slurry is large, while the cement content of the lower pile body is often very small. The reason is that the pressure of spraying powder or grouting is constant due to construction control, so the upper par...

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Problems solved by technology

[0003] The most common cement-soil piles are cement powder spray piles or cement slurry mixing piles. The defect of this pile is that along the length of the pile body, the distribution of cement and soil in the upper and lower parts is uneven, that is, the amount of cement powder or cement in the upper 2 to 4 meters. The amount of slurry is large, while the cement content of the lower pile body is often very small. The reason is that the pressure of spraying powder or grouting is constant due to construction control, so the upper part is sprayed large, while the lower part of the pile is due to the pressure of the foundation soil itself. problem, the ejection volume will be reduced

At the same time, the pile belongs to chemical consolidation. When the pile consolidates the surrounding soil, it also reduces the capillary pores and capillary water channels of the soil itself, which is detrimental to the water permeability and environmental protection of the soil.

[0004] The gravel (gravel) pile is a loose pile, and its advantage is that it has strong water permeability. Using it to treat the foundation will not destroy the pore water channel in the foundation soil, and in the event of heavy rain, the water in the gravel or gravel will seep into the ground. , can play a role in regulating groundwater, but when this type of bulk pile is treated for soft soil, the pile top and the upper length range of 2 to 8 times the pile diameter will often swell and collapse and cannot form a pile. Under the action of load, the pile top and the length range of 2-8 times the pile diameter will also bulge and collapse, which will affect the effect of foundation treatment. The reason is that the foundation soil is soft and lacks lateral wrapping of bulk pile materials Under the action of load, the upper part of the pile body will bulge and shear collapse

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