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Reinforcing method of vacuum preloading lead pipe pile gas injection carbonized super-soft foundation

A conduit pile and ultra-soft technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of long treatment period of ultra-soft foundation, uneven ventilation and carbonization, poor environmental benefits, etc., to shorten infiltration and carbonization time, faster infiltration and diffusion, and shorter curing cycle

Active Publication Date: 2019-11-29
NANJING FORESTRY UNIV
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Problems solved by technology

[0007] In view of the deficiencies in the above-mentioned background technology, the present invention aims to propose a method for strengthening supersoft foundations by vacuum preloading and gas injection carbonization of duct piles, so as to solve the problems of long treatment period, low bearing strength, high economic cost, and problems of supersoft foundations in the prior art. Technical problems of poor environmental benefits, uneven carbonation of ventilation and poor stability

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  • Reinforcing method of vacuum preloading lead pipe pile gas injection carbonized super-soft foundation

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Embodiment

[0070] a. Site treatment and exploration: Clean up and level the ultra-soft foundation 1 and surrounding sites, excavate side ditches 3 with a depth and width of 1.0m along the periphery of the pre-treatment site, set up settlement observation piles outside the site, and measure the ultra-soft ground 1 The basic physical and chemical indicators, of which the site area is 2500m 2 , mud depth 4.5m, water content 130%, specific gravity 2.63, liquid limit 60%, plastic limit 30%, organic matter content 7.0%, pH value 7.2, etc.

[0071] b. The driving of the first pipe pile group: According to the basic physical and chemical indicators of the ultra-soft foundation 1, the pile length is determined to be 5.5m, the outer diameter of the cylindrical hollow pile is 0.4m, and the pile spacing is 2.0m. The driving width is the maximum working radius of the piling machine is 9m, five rows of pipe piles 2 are driven in the ultra-soft foundation 1, and the distances between the five rows of p...

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Abstract

The invention discloses a reinforcing method of a vacuum preloading lead pipe pile gas injection carbonized super-soft foundation, and belongs to the technical field of super-soft foundation reinforcing treatment of geotechnical engineering. The reinforcing method comprises the steps of site treatment and exploration, first pile group construction and beating, spraying mixing equipment placement and debugging, curing agent spraying and mixing, first treatment system layout, vacuum preloading-gas injection carbonized treatment, first site treatment completing, continuous construction, final treatment and the like. The reinforcing method has the advantageous of a vacuum preloading method, a magnesium oxide carbonization curing method and a pipe pile composite foundation, the drainage efficiency and the infiltration diffusion efficiency of carbon dioxide are greatly improved through coordination work of vacuum preloading and pipe pile gas injection, the compacting displacement action of apipe pile on soft soil is fully utilized, mud soil is effectively glued through hydration products and carbonization products, thus the intensity of the soft soil composite foundation is enhanced, and the stability is improved. The reinforcing method has the characteristics that the treatment effect is good, the period is short, and low-carbon and environmentally-friendly and economic efficiencyare achieved, and resource utilization of industrial waste in soft foundation treatment is achieved.

Description

[0001] Field [0002] The invention belongs to the technical field of reinforcement treatment of silt soft soil in environmental geotechnical engineering, and in particular relates to a reinforcement method for vacuum precompressed duct pile gas injection carbonization supersoft foundation. Background technique [0003] With the rapid development of civil engineering construction in our country, a large amount of silt, silty soil or dredging fill is often encountered in the construction of airport terminals, railways and highways, and civil buildings, especially in coastal areas along the river. These silt soft soils have water content. High rate, high permeability, large liquid-plastic limit, and low shear strength cannot meet the direct needs of the project. It is often necessary to carry out drainage and solidification treatment on these soft soil foundations to reduce the groundwater level and uneven settlement and improve the strength of the foundation. Traditional silt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12E02D3/11E02D3/10
CPCE02D3/10E02D3/11E02D3/12
Inventor 蔡光华刘松玉杜广印李江山陈加富阮静李海涛郑晨晖赵志峰
Owner NANJING FORESTRY UNIV
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