Foaming agent specially used for soil pressure balance shield tunneling machine and preparation method thereof

Abstract

The invention provides a foaming agent specially used for a soil pressure balance shield tunneling machine and a preparation method thereof, and relates to the field of shield construction buildings. The foaming agent is prepared from the following raw materials, in parts by weight: 6-10 parts of sodium dodecyl sulfate, 9-15 parts of dodecyl betaine, 3-5 parts of sodium chloride, 6-8 parts of n-butyl alcohol, 4-6 parts of dodecyl dimethyl amine oxide, 2-3 parts of sodium lauryl alcohol polyoxyethylene ether sulfate, 5-7 parts of sodium alginate, 3-7 parts of sodium dodecyl polyoxyethylene ether sulfate, 3-5 parts of hexadecyl trimethyl ammonium chloride, 2-3 parts of fluoranthene, 2-4 parts of ethylenediamine tetraacetic acid disodium salt, 3-5 parts of a cinnamon bark extractive, 3-5 parts of polyethylene glycol, 5-7 parts of a tackifier, and 70-100 parts of water, and the preparation method comprises three steps. According to the invention, the foaming agent can improve soil plasticity, fluidity and impermeability, can improve residual soil fluidity in seal earth cabins, protects cutting tools, reduces cutter head torque, can make soil bodies formed soil plugs in a screw conveyer, and effectively prevents spewing, and the foaming agent has no toxicity, no corrosion, good bubble stability, and long duration time.

Description

technical field [0001] The invention relates to the construction field of shield tunneling, in particular to a special foaming agent for earth pressure balance shield tunneling machines and a preparation method thereof. Background technique [0002] The shield method is a fully mechanized construction method in the underground excavation method. It is to push the shield machine in the ground, and support the surrounding rock through the shield casing and segments to prevent collapse into the tunnel. A mechanized construction method in which the soil is excavated with a cutting device in front of the excavation face, transported out of the hole by an excavation machine, pushed in by a jack at the rear, and assembled with prefabricated concrete segments to form a tunnel structure. At present, earth pressure balance shield tunneling has become the mainstream of urban subway construction methods in my country, and foam modifier, as an excellent soil conditioner, occupies the lea...

AI Technical Summary

Problems solved by technology

When the foaming agent is used in the shield tunneling process, according to the on-site construction of the shield tunneling, the foaming system emits foam and mixes with the soil for improvement. There is a time interval. Therefore, the bubbles used for shield tunneling must have certain stability. Before the body is mixed, the excessive decay and collapse will lose the purpose of improving the excavated soil. However, although the current foaming agent has excellent foaming performance, the stability of the foam is difficult to meet the requirements.