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Foaming agent for soil pressure balance shield machine

A technology of earth pressure balance and shield machine, applied in the field of foaming agent, can solve the problems of less research on foaming agent, high price, high construction cost, etc., and achieve the effect of stable bubble, long time of foam stabilization and good foaming effect

Active Publication Date: 2014-04-09
CHINA RAILWAY NO 3 GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, many domestic scientific research institutes have carried out research on foam adhesives, but most of the research directions are sandy pebble formations or sandy gravel formations, and there are few studies on foaming agents in hard plastic and soft plastic expansive clays. The foam agents used in similar formations are all imported products, which are expensive and the construction cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: A foaming agent for an earth pressure balance shield machine, which is prepared by mixing and stirring the following raw materials at a water temperature of 30 to 50°C in mass percentages: sodium lauryl sulfate (K12) 6%, fat Alcohol polyoxyethylene ether sodium sulfate (AES) 2%, sodium α-olefin sulfonate (AOS) 1.5%, modified silicone resin polyether emulsion (MPS) 1.5%, water 89%.

[0018] The foaming agent produced in this example is used in an amount of 2%. According to experiments, the foam stabilization time at room temperature is 21 minutes, the foaming ratio is 18 times, and the foam bearing capacity is good. The field use effect is good, reaching the level of imported products, and its foam stabilization effect is excellent.

Embodiment 2

[0019] Example 2: A foaming agent for an earth pressure balance shield machine, which is made by mixing and stirring the following raw materials in a mass percentage at a water temperature of 30-50°C: sodium lauryl sulfate (K12) 5%, fat Sodium alcohol polyoxyethylene ether sulfate (AES) 4%, sodium α-olefin sulfonate (AOS) 1.5%, modified silicone resin polyether emulsion (MPS) 1.3%, water 88.2%.

[0020] The foam agent produced in this example adopts the dosage of 2%. According to the experiment, the foam stabilization time is 18 minutes at room temperature, the expansion ratio is 15 times, and the foam bearing capacity is good. The on-site use effect is good, the cost is lower than that of Example 1, and the improvement effect of the muck soil is good.

Embodiment 3

[0021] Embodiment 3: a kind of foaming agent for earth pressure balance shield machine, is made by mixing and stirring the raw materials of following mass percentage under the water temperature of 30~50 ℃: sodium lauryl sulfate (K12) 5%, fat Sodium alcohol polyoxyethylene ether sulfate (AES) 3%, sodium α-olefin sulfonate (AOS) 2%, modified silicone resin polyether emulsion (MPS) 1.5%, water 88.5%.

[0022] The foam agent produced in this example adopts the dosage of 2%. According to the experiment, the foam stabilization time is 15 minutes at room temperature, the expansion ratio is 12 times, and the foam bearing capacity is good. The field application effect is good, and the muck improvement effect is good.

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PUM

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Abstract

The invention belongs to the technical field of foaming agents and provides a foaming agent for a soil pressure balance shield machine. The foaming agent solves the problem that the existing domestic foaming agent produces foam having performances such as uniformity, stability, lubricity and permeability which cannot completely satisfy foam requirements in shield construction and has limited adaptability. The foaming agent is prepared from sodium dodecyl sulfate, sodium alcohol ether sulphate, sodium alpha-olefin sulfonate, a modified silicone resin polyether emulsion and water according to a certain ratio. The foaming agent has stable foaming performances, good foaming effects and long foam stabilization time, realizes good improvement on muck in hard plastic and soft plastic expansive clay, improves plastic flowing and water sealing of excavated soil, prevents soil densification adhesion, prevents caking of a cutterhead and keeps soil warehouses pressure by bubble support. The foaming agent utilizes easily available raw materials having low prices so that a construction cost is reduced effectively. The foaming agent utilizes bulk chemical products and has no pollution and no toxic or side effect on muck and the surrounding environment.

Description

technical field [0001] The invention belongs to the technical field of foaming agents, and in particular relates to a foaming agent for an earth pressure balance shield machine. Background technique [0002] In recent years, subway tunnel projects have been excavated by a mechanical device called a shield machine. The type of shield machine currently used is mainly an earth pressure balance shield machine, which is characterized by using excavated muck as a support The stable medium of the excavation surface requires the muck as the supporting medium to have good plastic deformation, soft consistency and low permeability. Since the general soil cannot fully meet these characteristics, it needs to be improved. The technical point is to inject foam and other mixed materials into the front of the cutterhead of the shield machine and the soil bin, and then vigorously stir to improve the plasticity and stability of the excavated dregs. Mobility, reduce the water permeability of ...

Claims

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Application Information

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IPC IPC(8): C04B24/16
Inventor 石鸿张肃正王浩宇李美超褚晓晖
Owner CHINA RAILWAY NO 3 GRP CO LTD
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