Crushed rock pile used for strengthening extremely soft soil foundation and construction method thereof

Abstract

The invention relates to a crushed rock pile used for strengthening an extremely soft soil foundation and a construction method thereof, capable of effectively controlling filling quantity of crushed rock filler so as to reduce the foundation strengthening construction cost. The crushed rock pile comprises a net barrel (10) which vertically extends to a foundation supporting layer or design elevation and crushed rock filler (20) which is filled in the net barrel (10) densely, wherein the circumference of the net barrel (10) is provided with a grid structure, and the grid size of the grid structure is smaller than the grain size of the crushed rock filler (20). The construction method comprises the following steps of: mounting a pile head (30) at the lower end of an immersed tube, placing the net barrel (10) in the immersed tube; filling the crushed rock filler (20) into the net barrel (10); acting on the immersed tube by adopting static pressure or vibrating equipment so that the immersed tube is immersed into soil and reaches the foundation supporting layer or the design elevation; and vertically lifting the immersed tube upward until the immersed tube is pulled out of a pile hole. By adopting the crushed rock pile and the construction method provided by the invention, the crushed rock filler can be prevented from radially spreading outside a pile, so that the crushed rock filling quantity is bassically consistent with the volume of the pile body of the crushed rock pile, thereby well exerting the advantage of low manufacturing cost of the crushed rock pile.

Description

technical field [0001] The invention relates to ground reinforcement measures, in particular to a gravel pile for very soft soil foundation reinforcement and a construction method thereof. Background technique [0002] When the natural foundation cannot meet the requirements of the building (structure) on the foundation, the foundation needs to be treated to form an artificial foundation to ensure the safety and normal use of the building (structure). Vertical reinforcement composite foundation is a commonly used technical measure for foundation reinforcement. At present, the vertical reinforcements used in engineering include gravel piles, sand piles, cement soil piles, lime piles, various low-strength piles and reinforced concrete piles, etc. . Among them, because the gravel pile composite foundation can fully exert its replacement effect and increase the shear strength of the foundation; at the same time, the gravel pile body has good water permeability, and under the ac...

AI Technical Summary

Problems solved by technology

However, when the gravel pile passes through extremely soft soil layers such as silt and peat, the commonly used vibratory impact method and immersed tube method cannot effectively prevent the filled gravel filler from diffusing out of the pile diameter and squeezing into the lower-strength ground. In the soft ground, the uniformity of the crushed stone pile is poor, especially in engineering practice, the actual amount of crushed stone filler is often several times the volume of the designed crushed stone pile, so that the main advantage of the low cost of the crushed stone pile cannot be brought into play, resulting in The cost of foundation reinforcement treatment projects has increased significantly, which is a technical problem that has not been effectively solved

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