CN103864334A - Environment-friendly foaming agent for earth pressure balance shield tunneling machine - Google Patents
Environment-friendly foaming agent for earth pressure balance shield tunneling machine Download PDFInfo
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- CN103864334A CN103864334A CN201410048684.2A CN201410048684A CN103864334A CN 103864334 A CN103864334 A CN 103864334A CN 201410048684 A CN201410048684 A CN 201410048684A CN 103864334 A CN103864334 A CN 103864334A
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Abstract
The invention discloses an environment-friendly foaming agent for an earth pressure balance shielded tunneling machine. The environment-friendly foaming agent comprises the following components in percentage by weight: 6 to 12% of foaming agent, 2 to 6% of thickening agent, 2 to 6% of foam stabilizer, 2 to 5% of emulsifier, 0.1 to 0.2% of water quality stabilizer, 0.2 to 0.3% of preservative, and the balance of deionized water. The production process comprises the following steps of: adding all the components to deionized water in sequence under the normal temperature by agitating; then uniformly mixing and agitating to obtain water-soluble liquid with a colorless and transparent appearance, wherein the liquid has the density of 1.05+/-0.05g/ml under the temperature of 25 DEG C, and the pH is at 6.5 to 7.5. The foaming agent has the advantages that the foam is fine and rich and lasts for a long time, and the permeability is high; the foaming agent also shows outstanding lubricating performance so as to obviously reduce the torque of a cutterhead, and thus the requirement for improving muck during the excavating of the earth pressure balance shield tunneling machine can be met well; in addition, the heavy metal content and organic pollutant content in the foaming agent are much lower than relevant national limited value of the content of such substances in earth, and thus the foaming agent has the advantages of being green and environment-friendly.
Description
Technical field
The present invention relates to Shield Construction Technique field, refer more particularly to a kind of balancing earth-pressure shielding machine construction green-blowing agent formula and production technique thereof.
Background technology
Along with the development of urban underground space, for the shield construction of underground space construction, it is the fruitful constructional method of modern city tunnel construction, but the shield structure of early application, in the time of underground driving, in order to keep the stable of excavation face, generally all in tunnel, apply pressurized air or reduce tunnel ground water table along the line, even adopt the ancillary technique measures such as chemical grouting.Because above measure is unfavorable for the control to construction safety, land subsidence and environment protection, thereby limit application and the development of shield structure, thereby promoted the development and application of closed equilibrium principle shield structure technology.And in closed equilibrium principle shield structure technology, earth pressure balanced shield technology due to applicable geologic condition by weak cohesive soil to sand and gravel scholar, scope is constantly expanded, and is therefore used widely, and with its technology and superiority economically, become the main flow of tunnel construction.
The successful key of shield machine with soil pressure balance for construction process is excavation face will be cut to the soil body getting off in pressure tank, to be adjusted to one " plastic flow state ".If stratum is silt clay layer, as long as stir by rotation wing plate in pressure tank, just can meets " plastic flow state " and construct smoothly.But if less pebble bed, sand stratum, the decayed rack stratum that be clay content, stratum, the soil body that knife cutting enters pressure tank is difficult to form this " plastic flow state ", thereby brings difficulty to construction.This constructional difficulties is mainly to show as four kinds of phenomenons, i.e. excavation face unstability, pressure tank obturation, pressure tank molding and gush occur.Therefore how adding for the condition on the stratum of shielded construction difficulty the additive that is suitable for this soil layer, its soil body in pressure tank is formed be beneficial to " the plastic flow state " of construction, is the key problem in technology of earth pressure balanced shield.
At present, in domestic subway construction, generally carry out soil improvement with various import additives and spread auxiliary shield machine construction, from the situation of reflection, really can effectively reduce the moment of torsion of cutterhead, ensure carrying out smoothly of construction.General conventional additive has bentonite slurry, bubble etc.Owing to using bentonite slurry need add auxiliary facility and carry out roach processing, take workyard, increase cost, the superiority that makes to add bubble is particularly outstanding.But because domestic development and production shield structure is poor with whipping agent foaming effect, very different qualitatively, there is potential safety hazard in shielded construction, cause the shielded construction of domestic subway tunnel mostly to adopt imported materials and items, with high costs, therefore, research and development Domestic Shield becomes a task too impatient to wait with whipping agent.
Summary of the invention
The object of the present invention is to provide a kind of can effectively improve the problems referred to above, to environment without harm shield structure whipping agent.
Balancing earth-pressure shielding machine in the present invention counts by weight percentage with green-blowing agent, is made up of following component: whipping agent 6 ~ 12%, thickening material 3 ~ 6%, suds-stabilizing agent 3 ~ 6%, emulsifying agent 4 ~ 5%, water quality stabilizer 0.1 ~ 0.2%, sanitas 0.2 ~ 0.3%, surplus is deionized water.
Manufacturing condition is: at normal temperatures each component is joined successively in deionized water under agitation condition, and after stirring, to make outward appearance be water white water soluble liq, this liquid is that density at 25 DEG C is 1.05 ± 0.05g/ml in temperature, and pH value is between 6.5 ~ 7.5.
Whipping agent in the present invention has the advantages such as foaming efficiency is high, froth stability good and biological degradability is good.For balancing earth-pressure shielding machine tunneling construction, in cabin, inject foam to shield engine excavation face, soil pressure, can effectively improve plasticity of soil, solve pressure tank obturation in Shield Construction Method Used, soil solidifying or the dumper common technique difficult problem such as gush, reach and stablize the excavation face soil body, improvement soil body stream plasticity energy, reduce cutterhead moment of torsion, slow down tool wear, improve and tunnel and unearthed efficiency.
Passed through in Guangzhou, the use of the shielded construction unit such as Shenzhen, Chengdu, Changsha and Nanchang proves, this product is good to the sediment improvement impact of performance, indices all can meet shielded construction requirement, reaches advanced world standards.Can fully solve the construction difficult problem such as " mud lining ", " gushing ", guarantee that shield structure reaches the best effect that advances, reduce construction cost, improve operating efficiency.
Embodiment
Embodiment mono-
Balancing earth-pressure shielding machine special-purpose foaming agent in the present embodiment, count by weight percentage, formed by following composition: the sodium lauryl sulphate (K12) 7% that plays foaming effect, play thickening, foaming, the OP-10 4% of steady bubble effect, play foaming, negatively charged ion Gemini surface active agent α-sulfonation Uniphat A60 Gemini surface active agent 3% of steady bubble effect, play foaming, the polyoxyethylene nonylphenol ether 2% of emulsion dispersion effect, play the isothiazolinone 0.2% of preservative activity, play the disodium ethylene diamine tetraacetate 0.1% of water quality stabilizer effect, above each component is indispensable, surplus is for being deionized water 83.7%.
At normal temperatures by the agent of each component mixing and stirring producing foamed, the product physical and chemical index of this whipping agent is as following table:
| Project | Physical and chemical index |
| Outward appearance | Colourless or micro-yellow transparent liquid |
| Density (25 DEG C), g/ml | 1.05±0.05 |
| PH value | 6.5~7.5 |
| Water-soluble | Any than dissolving each other with water |
| Environmental-protecting performance | Asepsis environment-protecting product |
Embodiment bis-
In the present embodiment, the agent of balancing earth-pressure shielding machine special-purpose foaming, counts by weight percentage, and is made up of following composition: play the polyoxyethylenated alcohol sodium sulfate 7% of foaming effect, play the C of thickening, foaming, steady bubble effect
12~ C
14alkyl monoglycosides 3%, play the dodecanamide propyl amine oxide 3% of foaming, steady bubble effect, play the sodium alkyl sulfate 3% of foaming, emulsion dispersion effect, play the different imidazolone 0.2% of methyl chloride of preservative activity, play the ethylene diamine tetra methylene phosphonic acid sodium 0.1% of water quality stabilizer effect, deionized water 83.7%.
Whipping agent physical and chemical index prepared by this example is identical with embodiment mono-.
Embodiment tri-
Balancing earth-pressure shielding machine special-purpose foaming agent in the present embodiment, count by weight percentage, formed by following composition: the cocamidopropyl betaine (CAB) 10% that plays foaming effect, play the NP-10 4% of thickening, foaming, steady bubble effect, play the dimethyl dodecyl amine oxide 3% of foaming, steady bubble effect, play the polyoxyethylene nonylphenol ether 2% of foaming, emulsion dispersion effect, play the isothiazolinone 0.2% of preservative activity, play the disodium ethylene diamine tetraacetate 0.1% of water quality stabilizer effect, above each component is indispensable, and surplus is for being deionized water 80.7%.
The physical and chemical index of mixed whipping agent is identical with embodiment's mono-.
Embodiment tetra-
Balancing earth-pressure shielding machine special-purpose foaming agent in the present embodiment, count by weight percentage, formed by following composition: play the cocamidopropyl betaine (CAB) of foaming effect and the mixture 10% of sodium lauryl sulphate (K12) 1:1, play the C of thickening, foaming, steady bubble effect
12~ C
14alkyl monoglycosides 4%, play negatively charged ion Gemini surface active agent α-sulfonation Uniphat A60 Gemini surface active agent 3% of foaming, steady bubble effect, play the polyoxyethylene nonylphenol ether 4% of foaming, emulsion dispersion effect, play the different imidazolone 0.3% of methyl chloride of preservative activity, play the disodium ethylene diamine tetraacetate 0.2% of water quality stabilizer effect, deionized water 78.5%.
The physical and chemical index of mixed whipping agent is identical with embodiment's mono-.
Embodiment five
Balancing earth-pressure shielding machine special-purpose foaming agent in the present embodiment, count by weight percentage, formed by following composition: play the polyoxyethylenated alcohol sodium sulfate of foaming effect and the mixture 10% of cocamidopropyl betaine (CAB) 1:1, play the C of thickening, foaming, steady bubble effect
12~ C
14alkyl monoglycosides 4%, play negatively charged ion Gemini surface active agent α-sulfonation Uniphat A60 Gemini surface active agent 3% of foaming, steady bubble effect, play the polyoxyethylene nonylphenol ether 4% of foaming, emulsion dispersion effect, play the different imidazolone 0.3% of methyl chloride of preservative activity, play the disodium ethylene diamine tetraacetate 0.2% of water quality stabilizer effect, deionized water 78.5%.
The physical and chemical index of mixed whipping agent is identical with embodiment's mono-.
Embodiment six
Balancing earth-pressure shielding machine special-purpose foaming agent in the present embodiment, count by weight percentage, formed by following composition: play the polyoxyethylenated alcohol sodium sulfate of foaming effect and the mixture 10% of sodium lauryl sulphate (K12) 1:1, play the OP-10 4% of thickening, foaming, steady bubble effect, play the dimethyl dodecyl amine oxide 4% of foaming, steady bubble effect, play the sodium alkyl sulfate 4% of foaming, emulsion dispersion effect, play the isothiazolinone 0.3% of preservative activity, play the disodium ethylene diamine tetraacetate 0.2% of water quality stabilizer effect, deionized water 77.5%.
The physical and chemical index of mixed whipping agent is identical with embodiment's mono-.
Whipping agent in the present invention has the following advantages:
1, fine and smooth abundant, stable, the long half time of foam, a kind of gluey protective membrane of the outer formation of this foam, foam stabilization is difficult for breaking; Foam lubricating effect excellence, can make foam obtain good oilness at the soil body and cutterhead, thereby reduce to excavate the internal friction angle of the soil body, reduces the moment of torsion of cutterhead, has improved the stream plasticity of excavating native slag, has improved shield engine job parameter; Foam perviousness is high, can make foam rapid permeability to the soil body and backactor working-surface, its hypertonicity and then the wettability of foam, dispersiveness are not fully exerted.
2, permeability resistance is strong, makes whole shield engine driving power even, and face pressure fluctuation is little, is conducive to adjust support pressure, ensures shield engine driving attitude, controls ground settlement.
3, can significantly reduce sticky scholar's viscosity, clay is not easy to stick on pressure bulkhead and cutterhead, the soil body is not easy to form the phenomenon of molding, reach and improve the compactness of the soil body, the mobility of the raising soil body, thereby make its whole spaces that are easily full of Tu Cang and spiral conveyer, excavation face is carried out to sealing to maintain the stability of excavation face.
4, reduce slag scholar's water-permeable, inject foam and can effectively reduce slag scholar's perviousness, effectively prevent the generation of gushing in driving.
5, adjust Plastic flow of soil mobility in native storehouse, the dregs after cutting has good plastic fluidity, effectively prevents from, in native storehouse, " mud cake ", " obstruction " phenomenon occur, and not only can make excavation face maintain good supporting pressure, and guarantee casting is carried out smoothly.
6, environmental protection, biological degradability is good, pollution-free to edatope.
Claims (8)
1. a balancing earth-pressure shielding machine green-blowing agent, is characterized in that, counts by weight percentage, and is made up of following component: whipping agent 6 ~ 12%, thickening material 3 ~ 6%, suds-stabilizing agent 3 ~ 6%, emulsifying agent 4 ~ 5%, water quality stabilizer 0.1 ~ 0.2%, sanitas 0.2 ~ 0.3%, surplus is deionized water.
2. balancing earth-pressure shielding machine green-blowing agent according to claim 1, it is characterized in that, described whipping agent is: taking fatty alcohol-polyoxyethylene ether, oxo-alcohols Soxylat A 25-7, polyoxyethylene nonylphenol ether as representative nonionic surface active agent; Taking sodium lauryl sulphate (K12), Sodium dodecylbenzene sulfonate (LAS), sulfonated petro-leum, fatty alcohol polyoxyethylene ether sulfate (AES) as the anion surfactant of representative with taking the mixture of lauroyl amido CAB, one or more in the zwitterionics of representative of cocamidopropyl betaine (CAB).
3. balancing earth-pressure shielding machine green-blowing agent according to claim 1, it is characterized in that, described thickening material comprises that fatty diglycollic amide, alkyl glycoside (APG), OP-10, NP-10, tween-80, Arlacel-80 etc. itself have surface-active organic substance and at the sodium-chlor of implementing foaming agent thickening to increase water polarity, the mixture of one or more in the inorganic salt such as Repone K, ammonium chloride.
4. balancing earth-pressure shielding machine green-blowing agent according to claim 1, is characterized in that, described suds-stabilizing agent comprises polymer substance, as polyacrylamide, polyvinyl alcohol, albumen, polypeptide, starch, Mierocrystalline cellulose etc.; Nonionogenic tenside, as dimethyl dodecyl amine oxide, alkylol amide etc.; Negatively charged ion Gemini surface active agent, as α-sulfonation Uniphat A60 Gemini surface active agent; The mixture of one or more in fatty alcohol and fatty acid.
5. balancing earth-pressure shielding machine green-blowing agent according to claim 1, it is characterized in that, described emulsifying agent is: the mixture of one or more in polyoxyethylene nonylphenol ether, Ben-zylphenol Polyoxyethyl Ether, alkyl amine oxide, polyoxyethylene stearic acid ester, sylvic acid polyoxyethylene ester, phosphoric acid salt, phosphite, alkylammonium salt and tetrahydroglyoxaline ammonium salt.
6. balancing earth-pressure shielding machine green-blowing agent according to claim 1; it is characterized in that; described water quality stabilizer is: disodium ethylene diamine tetraacetate, Amino Trimethylene Phosphonic Acid, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, ethylene diamine tetra methylene phosphonic acid sodium, ethylene diamine tetra methylene phosphonic acid, diethylene triamine pentamethylene phosphonic, 2-phosphonic acids butane-1; one in 2,4-tricarboxylic acid, PAPE, 2-HPAA, hexanediamine four methylenephosphonic acids, poly (sodium aspartate) etc.
7. balancing earth-pressure shielding machine green-blowing agent according to claim 1, it is characterized in that, described sanitas is: the one in the different imidazolone of methyl chloride, isothiazolinone, phenylformic acid and its esters, Sorbic Acid and its esters, dehydroacetic acid (DHA) and sodium salt class, parabens.
8. balancing earth-pressure shielding machine green-blowing agent according to claim 1, its manufacturing condition is: at normal temperatures each component is joined successively in deionized water under agitation condition, and after stirring, to make outward appearance be water white water soluble liq, this liquid is that density at 25 DEG C is 1.05 ± 0.05g/ml in temperature, and pH value is between 6.5 ~ 7.5.
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| CN201410048684.2A CN103864334A (en) | 2014-02-12 | 2014-02-12 | Environment-friendly foaming agent for earth pressure balance shield tunneling machine |
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|---|---|---|---|
| CN201410048684.2A CN103864334A (en) | 2014-02-12 | 2014-02-12 | Environment-friendly foaming agent for earth pressure balance shield tunneling machine |
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Application publication date: 20140618 |