Variable diameter plastic sleeve mixed pile for reinforcing thick-covering and deep-burying soft soil layer and piling method

Abstract

The invention discloses a variable diameter plastic sleeve mixed pile for reinforcing a thick-covering and deep-burying soft soil layer and a piling reinforcing method. The upper part of a mixed pile body in a thick covering is filled with a scattered material by a small-diameter sleeve to form granular piles of an upright draining body, the lower part of the pile body in the soft soil layer is filled with the scattered material by a large-diameter sleeve and grouted to form a rigid pile with a grouted scattered material pile body, the large sleeve and the small sleeve are connected by a variable diameter joint, the lower part of the large sleeve is connected with a pile tip, the wall of the sleeve is provided with an opening hole and wrapped with geotextile, and a grout scattering area is formed at the periphery of the pile body. The pile-forming reinforcing method comprises: measuring the depth of the soft soil layer at the covering layer, preparing the lengths of the large sleeve and the small sleeve, connecting the lower part of the large sleeve with the pile tip, beating the large sleeve to the pile depth by a beating machine, leaving the sleeve and the pile tip in the foundation, filling the scattered material in the large sleeve, then grouting the large sleeve to form a fixed pile body, and forming the grout scattering area or a gourd pile body at the periphery of the pile. The mixed pile has a reasonable structure, is economic and practical, effectively improves the performance of the soil around the pile, and improves the bearing performance of the pile body.

Description

technical field [0001] The invention relates to a pile type for treating soft soil foundations, in particular to a variable-diameter plastic casing hybrid pile for reinforcing a thick covering layer and a deep buried soft soil layer and a pile-forming construction method thereof. Background technique [0002] In subgrade engineering, it is often encountered that the upper part has a thick covering layer (5-10m or more), and the lower part is a deep-buried soft clay foundation, such as the alluvial plains on both sides of the Qiantang River in Zhejiang (South Bank of Hangzhou Bay, Xiaoshan, Shaoxing, Yuyao It is more common in other areas), the surface is generally silt and silt layer, the thickness is generally greater than 10m, and the underlying layer is soft soil. Among them, the upper covering layer is sometimes relatively good geological conditions and dense silt, sand, silt, clay, etc., and generally does not need special treatment; but sometimes it is silt, but the co...

AI Technical Summary

Problems solved by technology

However, the cost of rigid piles is often very high, especially in the case of such a thick covering layer, it is wasteful to use uniform rigid piles for the upper and lower soil layers. In fact, it is often possible to leave the upper covering layer untreated, or use granular piles for vibration Densification and drainage preloading treatment are the most reasonable and economical, and even drainage board treatment is sufficient

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