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Carbonization mixing pile-ventilating pipe pile composite foundation and construction method thereof

A composite foundation and construction method technology, applied in foundation structure engineering, sheet pile walls, buildings, etc., can solve the problem of difficulty in meeting the reinforcement needs of deep and weak foundation soil, increasing the amount of foundation treatment and construction costs, and difficulty in meeting the needs of engineering bearing capacity and other problems, to achieve the effect of high construction efficiency, lower soil strength requirements, and increased strength

Active Publication Date: 2017-06-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing patents also have corresponding defects, such as: a soil carbonation solidification method and its device (201010604013.1), a treatment system and method for using industrial waste gas heat to strengthen soft soil foundations (201310122135.0) and a The treatment system for foundation reinforcement and the method of carbonized pile formation (201410203978.8) belong to the method of carbonized stirring piles. During construction, the depth of the stirring piles is limited, and it is difficult to meet the requirements of the engineering bearing capacity; carbon dioxide gas is easily leaked along the stirring shaft, causing secondary pollution; The requirements for the carbon dioxide foaming agent and its stability time are high, and the moisture content and porosity of the natural foundation soil are additionally increased, and the strength increase is not obvious, especially for natural foundations with high moisture content, the reinforcement effect is even worse
In addition, a carbonization reinforcement method for replacing cushions on soft soil foundations (201410272957.1) and an in-situ carbonization and solidification treatment method for shallow soft foundations (201510348797.9) both belong to the category of shallow foundation treatment. Uniform settlement makes it difficult to meet the reinforcement needs of deep and weak foundation soil; and the use of mixtures of different particle sizes for large-area replacement increases the amount of engineering and construction costs for foundation treatment and reduces construction efficiency

Method used

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  • Carbonization mixing pile-ventilating pipe pile composite foundation and construction method thereof
  • Carbonization mixing pile-ventilating pipe pile composite foundation and construction method thereof

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Effect test

Embodiment 1

[0035] like image 3 As shown, the carbonized stirring pile-ventilating pipe pile composite foundation, the carbonized stirring pile-ventilating pipe pile composite foundation is composed of carbonized magnesia cement soil mixing pile 15 and ventilating pipe pile 10, and the ventilating pipe pile 10 is composited on carbonized magnesia cement Soil mixing pile 15 inside. The magnesia cement in the magnesia carbide cement-soil mixing pile 15 is activated magnesia, a mixture of activated magnesia and quicklime, a mixture of activated magnesia and cement, or a mixture of activated magnesia, quicklime and cement. The ventilation pipe pile 10 is a reinforced concrete prefabricated pile.

[0036] combine figure 1 , figure 2 and image 3 As shown, the construction method of carbonized stirring pile-ventilating pipe pile composite foundation includes the following steps:

[0037] a. The site is leveled, the pile driver is in place, and the drill pipe 2 and the auger bit 5 of the ...

Embodiment 2

[0051] If the natural foundation 1 is sandy soil, within 5m from the surface, the moisture content of the natural foundation is less than 10%; within 5-10m from the surface, the moisture content of the natural foundation is 10%-20%; m, the moisture content of the natural foundation is greater than 20%. The powder content of magnesia cement is selected as 10%, active magnesia is selected as the curing agent, and the magnesia cement slurry is prepared according to the water / dry powder mass ratio of 0.8. According to the design requirements, the diameter of the mixing pile is set at 1200 mm, the mixing depth is set at 10 m, the outer diameter of the ventilation pipe pile 10 is 400 mm, and the length of a single ventilation pipe pile 10 is 10 m.

[0052] The specific steps of construction are:

[0053] a. Align the pile driver drill pipe 2 and the auger bit 5 vertically to the set pile position of the natural foundation 1;

[0054] b. Start the stirring pile driver to the penetr...

Embodiment 3

[0061] If the natural foundation 1 is silt, within 3m from the surface, the moisture content of the natural foundation is less than 10%; within 3-8m from the surface, the moisture content of the natural foundation is 10%-20%; m, the moisture content of the natural foundation is greater than 20%. The powder content of magnesia cement is selected as 10%, the mixture of activated magnesia and lime is selected, the mixing ratio is 1:1, and the magnesia cement slurry is prepared according to the water / dry powder mass ratio of 0.8. According to the design requirements, the diameter of the mixing pile is set at 1400 mm, the mixing depth is set at 20 m, the outer diameter of the ventilation pipe pile 10 is 600 mm, and the length of a single ventilation pipe pile 10 is 10 m.

[0062] The specific steps of construction are:

[0063] a. Align the pile driver drill pipe 2 and the auger bit 5 vertically to the set pile position of the natural foundation 1;

[0064] b. Start the stirring ...

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Abstract

The invention relates to a carbonization mixing pile-ventilating pipe pile composite foundation and a construction method thereof, belongs to the technical field of foundation treatment for civil construction engineering, and provides the carbonization mixing pile (CMP)-ventilating pipe pile composite foundation which is high in bearing capacity, high in construction efficiency, reliable in quality, low-carbon and environmentally-friendly and the construction method of the composite foundation so as to overcome and solve the defects and the problems in existing reinforcement technologies and magnesium oxide carbonization reinforcement methods for thick and soft foundation composite piles. The carbonization mixing pile-ventilating pipe pile composite foundation comprises a carbonization magnesium oxide cement soil mixing pile and a ventilating pipe pile; and the ventilating pipe pile is composited inside the carbonization magnesium oxide cement soil mixing pile. The requirements for reinforcement of the soft foundation and carbon dioxide resource utilization are realized.

Description

technical field [0001] The invention relates to a carbonized stirring pile-ventilating pipe pile composite foundation and a construction method thereof, and belongs to the technical field of foundation treatment of civil engineering engineering. Background technique [0002] In the construction of existing civil engineering projects, it is often necessary to strengthen the deep soft soil foundation with low strength, high compressibility and poor permeability. The commonly used foundation treatment methods include dynamic compaction method, replacement method, cement / lime mixing pile method , reinforced concrete piles and bored piles, etc. However, the construction noise of the dynamic compaction method is large and the scope of application is small, so it is not suitable for silty soft soil with high water content; the replacement and filling method requires a large amount of work and high cost, and is only suitable for shallow foundations. The cement / lime soil mixing pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46E02D5/30
CPCE02D5/46E02D5/30
Inventor 刘松玉蔡光华
Owner SOUTHEAST UNIV
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