Method for reinforcing soft soil foundation at deep mixing pile

Abstract

The invention relates to a method for reinforcing a soft soil foundation at a deep mixing pile, which comprises the steps of land formation, construction layout, spray mixing and sinking, curing agent grout mixing, stirring and hoisting, repeated spray mixing and sinking, and shifting, etc.; and the main technological parameters are as follows: 0.55 to 0.75 of water-cement ratio, 0.38 to 0.75 m / min of sinking and empty stirring speed, 0.3 to 0.5 m / min of hoisting speed, 18 to 30L / min of guniting quantity and 0.5 to 0.7 MPa of guniting pressure. Compared with the existing cement mixing pile foundation reinforcing process, the method provided by the invention has the advantages of appropriate water-cement ratio, high pile quality, high strength, less reinforcing agent consumption, low cost and remarkable economic benefit, and is easy to evenly stir; and meanwhile, the method also has the following advantages: (1) the cement can be hydrated fully, and during construction, the role of the cement can be exerted completely; (2) the construction quality is easy to control and guarantee; and (3) the construction on deep piles can be performed.

Description

technical field [0001] The invention relates to the field of road construction, in particular to a method for treating soft ground with deep-layer mixing piles. Background technique [0002] Our country has a vast territory, and there are soft soil layers of various origins, which have a wide distribution range and a large thickness of the soil layer. This type of soft soil is characterized by high water content, large void ratio, low shear strength, high compressibility, poor permeability, and long settlement stability time. In recent years, with the rapid development of highway engineering construction, it is often necessary to construct highway bridges on soft soil foundations. Due to the poor building performance of soft soil foundations, manual reinforcement is required. There are many treatment methods for soft soil foundations, such as We commonly excavate non-adaptable soil for replacement and filling, cement or lime stabilized soil treatment, slab stone extrusion, ...

AI Technical Summary

Problems solved by technology

However, the construction of deep cement mixing piles has the characteristics of many points, long lines, and wide areas, and the management of construction is relatively difficult. Moreover, the quality of deep cement-soil mixing piles and the lifting speed, the amount of cement mixed, and the continuity of spraying materials Therefore, how to ensure the quality of piles under economic conditions, and then ensure the effect of soft foundation treatment is a topic we explore in engineering practice

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