Filling free vibroflotation method

A vibrating method and no filler technology, which is applied in the fields of soil protection, construction, infrastructure engineering, etc., can solve the problems of increasing project investment and construction difficulties, and achieve the effects of saving construction costs, simple construction, and improving high-quality rate

Inactive Publication Date: 2005-01-19
SHANGHAI INTERNATIONAL PORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Projects such as ports, airports and roads often need to deal with large areas of shallow soft soil foundations, and the inability to a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Embodiment 1 Determined the vibrating construction parameters of the filler-free vibrating method through experiments:

[0008] 1. The construction area should be drained first before the construction using the ‘filler-free vibrating method’. Since the groundwater level is high after hydraulic sand filling, the construction site should be properly dewatered and drained. Precipitation and drainage can adopt conventional methods such as drainage ditches, etc. It is advisable to lower the groundwater level to meet the normal movement of the vibrating machine. Generally, the groundwater level should be lowered to about 1m above the ground. In addition, drainage work should be done well during and after vibrating construction to prevent excessive water accumulation.

[0009] 2. The vibrating machinery adopts "herringbone"-shaped steel beams, one machine with two or three cranes, that is, one crane passes through a "herringbone"-shaped steel beam with two or three vibrators t...

Embodiment 2

[0017] Example 2 An application example of the non-filler vibrating method in a road yard in a container port area. The road yard in a container port area is located on the beach between the old and new embankments of the Yangtze River. The elevation of the beach is -0.1m-1.0m. Due to the low elevation of the original ground of the site, silty sand with a thickness of about 4.0m-5.5m was dredged and filled on it. The particles of the dredged filled sand are uniform, and the silt and fine sand particles with a particle size greater than 0.0075mm have a content of more than 85% and a high water content. , The mud content is generally less than 5%. The underground foundation soil layer of the original beach in this area is roughly divided into five layers from top to bottom. The first layer is silt mixed with silty clay; the second layer is silty silty clay mixed with silt; the third layer is silt; The fourth layer is a saturated soft clay layer, gray, soft plastic, partially si...

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Abstract

The invention relates to a filing-free vibroflotation method, characterized in setting the following vibroflotation parameters: a. setting the vibroflotation depth to more than differences between the hydraulic sand-filling level and the ground level, and less than differences between the hydraulic sand-filling level and the undisturbed soil level; b. setting the vibroflotation space to 2m-3m, and the vibroflotation hole site is arranged as an equiangular triangle; c. setting the vibroflotation dense current to 20A-25A; d. setting the vibroflotation time to 8s-10s in hole center, and 30s in hole bottom; e. setting the hydraulic pressure to 0KPa-50KPa when vibroflotation; f. setting the vibroflotation descent rate to 0m/min-2m/min, and the lifting rate to 1m/min-2m/min; g. setting the vibroflotation mode to double or triple. Processing powdered sand bed foundation by said method is simple, saves construction costs and has good consolidation effect.

Description

technical field [0001] The invention relates to a method for stabilizing and reinforcing the foundation, in particular to a vibrating method without filler for treating the foundation of the fine sand layer. Background technique [0002] At present, the 'filler-free vibrating method' technology used in domestic and foreign projects is only suitable for the treatment of coarse sand foundations and medium sand foundations with a clay content of less than 10%, and is not suitable for the treatment of saturated loose silt and fine sand foundations. Novelty search reports have also found no actual examples of applying the 'filler-free vibrating method' to treat large-area silt-fine sand foundations at home and abroad. Compared with the vibrating method with filler, the vibrating method without filler has the advantages of short construction period and low construction price. Projects such as ports, airports and roads often need to deal with large ar...

Claims

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Application Information

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IPC IPC(8): E02D3/046
Inventor 包起帆邓筱鹏肖勇周健吴剑黄茂松贾敏才张志平
Owner SHANGHAI INTERNATIONAL PORT
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