Method for reinforcing soft soil foundation by using cement-soil mixing pile

Abstract

The invention relates to a method for reinforcing a soft soil foundation by using cement-soil mixing piles. The method comprises the steps of 1) arranging pile positions on the soft soil foundation; 2) lifting a mixing machine to one pile position on the soft soil foundation by using a tower crane; 3) starting up the mixing machine, wherein a mixing head cuts soil while rotating and then sinks to design depth; 4) preparing cement grout; 5) lifting the mixing head, spraying the grout and performing mixing to enable the cement grout to be fully mixed with the soil till the mixing head is lifted up to the ground; 6) repeating the step 3 to the step 5, wherein each pile requires for re-mixing and re-spraying; 7) filling clean water into an aggregate bin, starting up a grout pump to clean residual grout in all pipelines and cleaning the mixing head; and 8) moving the mixing machine to the next pile position and repeating the step 2 to the step 7 to carry out the construction of the next pile. Compared with the prior art, the method for reinforcing the soft soil foundation by using the cement-soil mixing piles has the advantages that the water-cement ratio is proper, the goal of uniform mixing is easy to realize, the pile forming quality is high, the strength is high, the construction is convenient to carry out, the construction cost is low and the economic benefits are remarkable.

Description

technical field [0001] The invention relates to a method for strengthening soft ground, in particular to a method for strengthening soft ground by using cement-soil mixing piles. Background technique [0002] With the rapid development of power grid construction, the basic design of transmission lines is related to the safe operation of the line, and more importantly, the investment and comprehensive benefits of the project. At present, the commonly used foundation types are: ① slab foundation; ② bored pile foundation. Among them, the straight column foundation is generally used in areas with good geological conditions, while the cast-in-situ pile foundation is generally used in unfavorable geological areas such as river ponds and soft soils. [0003] In the area of ​​soft soil foundation, the design of the tower foundation in the soft soil foundation area has its particularity because the design of the tower foundation should not only meet the design requirements of the ge...

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Problems solved by technology

[0005] (1) The bearing capacity of the foundation of the bearing layer is low, and the shallow covering soil layer is thick, which results in a larger area and deeper foundation burial for the general iron tower shallow foundation (slab foundation) compared with other areas. Deep, the excavation volume of earthwork is large, and the amount of concrete and steel bars is also large

[0006] (2) The width of the slab foundation bottom plate is large, and the foundation is greatly affected by external interference. For example, uneven loading near the tower position or excavation of fish ponds and ditches will cause damage to the stability of the foundation foundation

[0007] (3) For iron towers with a large foundation bearing capacity such as four circuits on the same tower and 500kV lines, if the slab foundation is used, the width of the floor will be very large, and even the slab foundation cannot meet the design requirements, so the entire line must use bored pile foundations

The pile foundation is a deep foundation, and the investment cost is large, and its cost is 2 to 4 times that of the slab foundation, which makes the foundation cost of the entire line very high

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