Method for quickly reinforcing ultra-soft soil foundation by using bagged sand cushion

Abstract

The invention discloses a method for quickly reinforcing an ultra-soft soil foundation by using a bagged sand cushion, which comprises the following steps of: (1) forming a quick reinforcing device on the ultra-soft soil foundation, namely (A) laying filling bags on the ultra-soft soil foundation in a reinforcing area, splicing the filling bags into a whole, filling fillers into the filling bags by using conveying equipment, tightening the filling bags after filling is finished and draining and compacting to form a bagged sand hard shell layer on the ultra-soft soil foundation, (B) inserting vertical plastic drainage plates into the surfaces of the filling bags on which the hard shell layers are formed, and (C) connecting a horizontal drainage pipeline with a vacuumizing system through a corrugated pipe to form the ultra-soft soil quick reinforcing device; (2) vacuumizing the quick reinforcing device; and (3) integrally reinforcing the foundation. The method has the advantages that: the process is simple, low in cost and short in construction period, differential settlement is small after construction, and the cost of laying a medium-coarse sand drainage cushion at a later stage is saved.

Description

technical field [0001] The invention relates to the technical field of foundation treatment of fixed buildings such as construction engineering, port engineering, and highway engineering, and in particular relates to an engineering technology for rapid reinforcement of ultra-soft soil foundations. Background technique [0002] In recent years, sea reclamation usually combines channel dredging and dredging projects, and dredged soil is used as fill soil for sea reclamation. After being blown to the construction site by machines such as suction boats, ultra-soft soil is often formed on the surface with extremely low water content. High, usually up to 70% to 200%, in a flowing state; and there is also a deep soft clay soil layer widely distributed below the dredger fill, which has the characteristics of high water content, high compressibility, low strength and bearing capacity, etc. The construction of roads, container yards and various facilities will be carried out on these ...

AI Technical Summary

Problems solved by technology

Moreover, this technology needs to lay one or more layers of grids and drainage cushions in step (1), and carry out vacuum preloading for 7 to 14 days; then remove the laid in step (1) in step (3). Drainage cushion, and then lay drainage sand cushion, the whole construction process is more complicated, and the treatment cost is higher

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