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An in-situ carbonization and solidification treatment system for shallow soft foundations

A technology for weak foundation and solidification treatment, which is used in foundation structure engineering, soil protection, sheet pile walls, etc., and can solve problems such as increasing the amount and cost of foundation treatment, higher requirements for stabilization time, and insignificant increase in strength. , to achieve the effect of being less prone to failure, improving carbonization efficiency, and improving uniformity

Active Publication Date: 2016-08-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, according to the existing patents "a soil carbonization solidification method and its device (patent number: ZL 201010604013.1)" and "a treatment system and method for using industrial waste gas heat to strengthen soft soil foundation (patent number: ZL 201310122135.0)" In the proposed method, carbon dioxide gas is easily leaked along the stirring shaft, causing secondary pollution; if the ventilation pipe with holes is directly inserted into the pile soil treated with active magnesia, although the strength of the pile body is improved, the material and time-consuming
A treatment system for foundation reinforcement and a carbonization pile method (application number: 2014102039788) solves the problem of carbon dioxide gas leakage to a certain extent, but has higher requirements on the carbon dioxide foam blowing agent and its stabilization time, and additional When the moisture content and porosity of the foundation soil are reduced, the strength increase is not obvious, especially for natural foundations with high moisture content, the reinforcement effect is even worse
A carbonation and reinforcement method for pad replacement on soft soil foundations (Application No.: 2014102729571). Although mixtures of different particle sizes are used for replacement and carbonization, the uniformity of foundation treatment and the obvious improvement of foundation strength are ensured, but large-area The replacement of the foundation will increase the engineering volume and cost of foundation treatment, and reduce the construction efficiency

Method used

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  • An in-situ carbonization and solidification treatment system for shallow soft foundations
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  • An in-situ carbonization and solidification treatment system for shallow soft foundations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] If the pretreated foundation soil 100 is sandy soil with a depth of 1.0m, the stirring radius of the first stirring device 110 and the second stirring device 114 is 0.3~0.5m, and the positive and negative rotation speeds of stirring are 15~25 r / min. The walking speed of the mixer 101 is 2.0~2.5 km / h, the mixing width is 3.0~3.5m, and the amount of curing agent is 300 kg / m 3 , when the test reading of the moisture content sensor 113 is less than 25%, when the first curing agent is selected as active magnesium oxide powder and the second curing agent is anhydrous calcium chloride powder, the delivery rate of the curing agent is 2.5~5.0 kg / s ; The delivery rate of the second curing agent is 0.05~0.1 kg / s.

[0067] The first stirring device 110 and the second stirring device 114 are first set to forward rotation to break the soil, and then reverse stirring when spraying the curing agent. After the on-site mixing of the pretreated foundation soil 100 is completed, the air-p...

Embodiment 2

[0070] If the pretreated foundation soil 100 is silt soil with a depth of 1.0 m, the stirring radius of the first stirring device 110 and the second stirring device 114 is 0.3 ~ 0.5 m, and the forward and reverse speeds of stirring are 15 ~ 25 r / min. The walking speed of type mixer 101 is 2.0~2.5 km / h, the mixing width is 3.0~3.5m, and the dosage of curing agent is 350 kg / m 3 When the first curing agent is selected as active magnesium oxide powder and calcium oxide powder (mass ratio is 3:1), the second curing agent is anhydrous calcium chloride powder, when the test reading of the moisture content sensor 113 is 25~30%, Then the delivery rate of the curing agent is 5.0-8.0 kg / s, and the delivery rate of the second curing agent is 0.05-0.1 kg / s.

[0071] The first stirring device 110 and the second stirring device 114 are first set to forward rotation to break the soil, and then reverse stirring when spraying the curing agent. After the on-site mixing of the pretreated foundat...

Embodiment 3

[0074] If the pretreated foundation soil 100 is silt with a depth of 1.0 m, the stirring radius of the first stirring device 110 and the second stirring device 114 is 0.3-0.5 m, and the forward and reverse rotation speeds of the stirring are 25-40 r / min. The walking speed of the mixer 101 is 2.0~2.5 km / h, the mixing width is 3.0~3.5m, and the amount of curing agent is 300 kg / m 3 When selecting the first curing agent to be activated magnesium oxide powder, the second curing agent to be anhydrous magnesium chloride powder, when the test reading of the moisture content sensor 113 is 30~35%, the delivery rate of the curing agent is 5.0~8.0 kg / s, The delivery rate of the second curing agent is 0.2~0.4 kg / s.

[0075] The first stirring device 110 and the second stirring device 114 are first set to forward rotation to break the soil, and then reverse stirring when spraying the curing agent. After the on-site mixing of the pretreated foundation soil 100 is completed, the air-permeabl...

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Abstract

The invention discloses an in-situ carbonization curing treatment system for a shallow soft ground, and belongs to the field of civil engineering ground stabilization. The treatment system comprises a crawler-type evenly mixing device, a curing agent feeding device, a board inserting device, a compacting and sealing device and a ventilating carbonization device. The evenly mixing device and the board inserting device are driven by a hydraulic power device, an activating oxide and anhydrous magnesium salt powder are used as curing agents, and the content of the curing agents is monitored and adjusted in real time through a moisture content sensor so that the treatment system can adapt to treatment of soft grounds different in moisture content; carbon dioxide gas is used for carbonization, and soft ground stabilization can be finished within several hours; the crawler-type evenly mixing device, the board inserting device, the curing agent feeding device and the power device are controlled by a control operation device connected with the moisture content sensor and a solenoid valve to operate synchronously, wherein the curing agent feeding device and the power device are installed on a crawler vehicle. The treatment system and a treatment method are simple and reliable and capable of adapting to a complex environment, construction is safe and efficient, and quantification of the curing agents in ground treatment and resource utilization of the carbon dioxide are achieved.

Description

technical field [0001] The invention relates to the field of civil engineering foundation treatment, in particular to an in-situ carbonization and solidification treatment system for shallow soft foundations. Background technique [0002] At present, the commonly used foundation treatment methods include dynamic compaction method, sandstone pile method, vibratory impact method, cement / lime fly ash mixing pile method, grouting method, high-pressure rotary grouting pile, preloading method, compacted cement / lime soil method, Lime-soil compaction pile method, single-liquid silicification method and replacement filling method, etc., and soft ground treatment also includes surcharge preloading method, vacuum preloading method and reinforcement method. However, the construction noise of the dynamic compaction method and the vibro-shock method is large; the traditional filling method has a large amount of work and high cost, and is prone to uneven distribution of strength; The equa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12E02D3/10E02D15/00E02D5/46
Inventor 蔡光华刘松玉杜延军秦小青曹菁菁
Owner SOUTHEAST UNIV
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