Foaming agent for low temperature-resistant soil pressure balance shield, and preparation method and application of foaming agent

Abstract

The invention discloses a foaming agent for a low temperature-resistant soil pressure balance shield, and a preparation method and the application of the foaming agent. The foaming agent is prepared from formulation components in percent by weight: 2 to 4 percent of alpha-olefin sulfonate, 4 to 10 percent of fatty alcohol-polyoxyethylene ether alkyl sulfate, 1 to 2 percent of coco fatty acid diethanol amide, 0.5 to 1 percent of cocamidopropyl betaine, 0.5 to 2 percent of polyethylene glycol, 0.1 to 0.5 percent of glycerol, 0.05 to 0.3 percent of lauryl alcohol, 0.1 to 0.5 percent of sodium chloride, 0.05 to 0.15 percent of 5-chloro-2-methyl-4-isothiazolin-3-one, 0.05 to 0.2 percent of citric acid and the balance of 79.35 to 91.65 percent of water. The foaming agent disclosed by the invention is used for construction under minus 20 DEG C, is particularly suitable for winter construction and is used for improving a soil body of which a construction soil layer is fine sand, medium-coarse sand and / or sandy gravel, the transparency of the foaming agent used for shield construction under a low-temperature condition in winter is ensured, so that a high foaming rate of the foaming agent is ensured, the foam stability is high, and an adverse effect brought to the construction as the foaming agent changes along with the temperature is reduced.

Description

technical field [0001] The invention relates to a foaming agent, in particular to a foaming agent for low-temperature resistant earth pressure balance shield tunneling and a preparation method and application thereof. Background technique [0002] As the mainstream method of urban underground tunnel construction, the earth pressure balance shield method has the advantages of small impact on the surrounding environment, high degree of automation, fast construction, high quality and high efficiency, safety and environmental protection, etc. It has shown strong advantages in underground construction. In recent years, The share of earth pressure balance shield construction has reached over 90%. At present, the geological conditions applicable to the new earth pressure balance shield are from the initial soft clay layer to the fine sand, medium coarse sand and gravel layer. Improvement of plasticity and water-stopping, stable micro-bubbles are filled between sand particles, impr...

AI Technical Summary

Problems solved by technology

In the low-temperature environment in winter, the foaming agent becomes white, stratified, turbid or has flocculent precipitation, which greatly reduces the foaming rate of the foaming agent, thus affecting the normal construction of the earth pressure balance shield machine

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