Foaming agent for earth pressure balance shield

A technology of earth pressure balance shield and foam agent, which is applied in the field of foam agent for earth pressure balance shield and silty sand formation, which can solve the problems of poor stability and low expansion rate, and achieve high foaming ratio, small pores, Good compatibility and mutual cooperation

Inactive Publication Date: 2014-08-06
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the technical problems of poor stability and low expansion rate of the existing foam agent for earth pressure balance shield tunneling,...

Method used

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  • Foaming agent for earth pressure balance shield
  • Foaming agent for earth pressure balance shield
  • Foaming agent for earth pressure balance shield

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The weight percent of each raw material component is:

[0027]

[0028] At room temperature, the components are mixed and dissolved in proportion, and stirred evenly, and it is ready. The expansion rate of the foam generated by the proportion can reach 84-90 times, and the half-life of the foam can reach 66-80 minutes. Its performance index is obviously better than that of the representative foam agent of the same type in China, such as the product produced according to the method recorded in the patent No. 200910223854 applied by China University of Mining and Technology (Beijing).

Embodiment 2

[0030] The weight percent of each raw material component is:

[0031]

[0032]

[0033] At room temperature, the components are mixed and dissolved in proportion, and stirred evenly, and it is ready. The expansion rate of the foam generated by this proportion can reach 70-80 times due to the difference in external temperature, and the half-life of the foam can reach 50-70 minutes.

Embodiment 3

[0035] The weight percent of each raw material component is:

[0036]

[0037] At room temperature, the components are mixed and dissolved in proportion, and stirred evenly, and it is ready. The expansion rate of the foam generated by this proportion can reach 30-45 times due to the difference in external temperature, and the half-life of the foam can reach 20-40 minutes.

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Abstract

The invention provides a soil improvement foaming agent for earth pressure balance shield construction. The foaming agent is formed by compounding 4 to 15% of fatty alcohol sulfate, 0 to 2% of fatty acid salt, 0 to 6% of alpha-olefin sulfonate, 3 to 8% of fatty alcohol polyoxyethylene ether sulfate, 0.1 to 2% of a foam stabilizer and 0.1 to 1% of a foaming aid, with the balance being water. The foaming agent is diluted and mixed with air and then foamed by a foam generation device, and tiny bubbles with a high expansion ratio, high stability, uniform distribution and a diameter of 5 to 300 mu m can be generated; the diameters of bubbles generated by other current foaming agents in China are normally 10 to 400 mu m; and smaller bubbles are more suitable for fine silt layer shield construction soil improvement. At normal temperature and normal pressure, the foam expansion ratio of foaming agent provided by the invention reaches 30 to 90 times, while the foam expansion ratios of foaming agents of a same kind in China are normally 12 to 16 times. Time for bursting of half of the bubbles (a half-life period) generated by the foaming agent is as long as 20 to 80 min, while the half-life period of other current foaming agents in China is normally less than 30 min.

Description

technical field [0001] The invention relates to a foaming agent for earth pressure balance shield tunneling. The foaming agent for earth pressure balance shield tunneling is mainly used as a soil conditioner in the construction of earth pressure balance shield tunneling, and is especially suitable for fine sand formations. The invention belongs to the technical field of shield tunnel engineering building materials. Background technique [0002] At present, my country is in a period of great development of underground engineering construction such as subways. Earth pressure balance shield tunneling is more and more widely used because of its advantages of safety, efficiency and environmental protection. However, due to the limitations of the applicable stratum conditions of the earth pressure balance shield, it is necessary to use soil conditioners to improve the engineering properties of the stratum soil, so that the earth pressure balance shield machine can safely and smoo...

Claims

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Application Information

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IPC IPC(8): C04B24/16
Inventor 袁大军乔国刚董朝文
Owner BEIJING JIAOTONG UNIV
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