CN115124683B - Double-component sodium silicate solution composite polyurethane foam material and grouting application - Google Patents
Double-component sodium silicate solution composite polyurethane foam material and grouting application Download PDFInfo
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- CN115124683B CN115124683B CN202210693561.9A CN202210693561A CN115124683B CN 115124683 B CN115124683 B CN 115124683B CN 202210693561 A CN202210693561 A CN 202210693561A CN 115124683 B CN115124683 B CN 115124683B
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- polyether polyol
- water
- grouting
- sodium silicate
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- 239000000463 material Substances 0.000 title claims abstract description 31
- 239000004115 Sodium Silicate Substances 0.000 title claims abstract description 28
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052911 sodium silicate Inorganic materials 0.000 title claims abstract description 28
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 229920005830 Polyurethane Foam Polymers 0.000 title description 4
- 239000011496 polyurethane foam Substances 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 45
- 229920000570 polyether Polymers 0.000 claims abstract description 45
- 229920005862 polyol Polymers 0.000 claims abstract description 42
- 150000003077 polyols Chemical class 0.000 claims abstract description 42
- 238000005187 foaming Methods 0.000 claims abstract description 28
- 239000002689 soil Substances 0.000 claims abstract description 20
- 239000006260 foam Substances 0.000 claims abstract description 16
- 239000004814 polyurethane Substances 0.000 claims abstract description 13
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003063 flame retardant Substances 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 11
- 229920002635 polyurethane Polymers 0.000 claims abstract description 11
- 239000004576 sand Substances 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 239000003381 stabilizer Substances 0.000 claims abstract description 6
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 27
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- -1 polyoxyethylene tridecyl ether Polymers 0.000 claims description 11
- 150000001412 amines Chemical class 0.000 claims description 8
- 239000000693 micelle Substances 0.000 claims description 8
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical compound ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 6
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- VONWDASPFIQPDY-UHFFFAOYSA-N dimethyl methylphosphonate Chemical compound COP(C)(=O)OC VONWDASPFIQPDY-UHFFFAOYSA-N 0.000 claims description 4
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- HHDUMDVQUCBCEY-UHFFFAOYSA-N 4-[10,15,20-tris(4-carboxyphenyl)-21,23-dihydroporphyrin-5-yl]benzoic acid Chemical compound OC(=O)c1ccc(cc1)-c1c2ccc(n2)c(-c2ccc(cc2)C(O)=O)c2ccc([nH]2)c(-c2ccc(cc2)C(O)=O)c2ccc(n2)c(-c2ccc(cc2)C(O)=O)c2ccc1[nH]2 HHDUMDVQUCBCEY-UHFFFAOYSA-N 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- DJOWTWWHMWQATC-KYHIUUMWSA-N Karpoxanthin Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1(O)C(C)(C)CC(O)CC1(C)O)C=CC=C(/C)C=CC2=C(C)CC(O)CC2(C)C DJOWTWWHMWQATC-KYHIUUMWSA-N 0.000 claims description 3
- PZBFGYYEXUXCOF-UHFFFAOYSA-N TCEP Chemical compound OC(=O)CCP(CCC(O)=O)CCC(O)=O PZBFGYYEXUXCOF-UHFFFAOYSA-N 0.000 claims description 3
- 239000004359 castor oil Substances 0.000 claims description 3
- 235000019438 castor oil Nutrition 0.000 claims description 3
- 150000002170 ethers Chemical class 0.000 claims description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 150000003138 primary alcohols Chemical class 0.000 claims description 3
- 150000003333 secondary alcohols Chemical class 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 3
- 239000006261 foam material Substances 0.000 claims 2
- 230000002787 reinforcement Effects 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 28
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 20
- 239000002002 slurry Substances 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 229920002396 Polyurea Polymers 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229920003226 polyurethane urea Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 description 1
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- HQUQLFOMPYWACS-UHFFFAOYSA-N tris(2-chloroethyl) phosphate Chemical compound ClCCOP(=O)(OCCCl)OCCCl HQUQLFOMPYWACS-UHFFFAOYSA-N 0.000 description 1
- GTRSAMFYSUBAGN-UHFFFAOYSA-N tris(2-chloropropyl) phosphate Chemical compound CC(Cl)COP(=O)(OCC(C)Cl)OCC(C)Cl GTRSAMFYSUBAGN-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0028—Use of organic additives containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
- E21D9/002—Injection methods characterised by the chemical composition used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2101/00—Manufacture of cellular products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
- C08J2375/08—Polyurethanes from polyethers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Emergency Medicine (AREA)
- General Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a bi-component sodium silicate solution composite polyurethane foaming material, which comprises the following components in volume ratio of 1:1 and a B component, the a component comprising: 85-95% of sodium silicate solution by mass percent; 4-14% of polyether polyol composite catalyst; 0.1 to 1 percent of surfactant. The component B comprises the following components: 83-90% by mass of a polymeric MDI prepolymerized with a polyether polyol; 8-15% of organic flame retardant; 1 to 2 percent of organic silicon foam stabilizer. The application of the foaming material in grouting reinforcement of the water-rich sand soil layer of the tunnel face of the subway shield tunnel is also provided. The two components are mixed and then quickly foamed and expanded to remove water in the cavity, so that the water in the cavity is not dispersed, diluted or dissolved by the water, and meanwhile, the foam has low foaming rate and high bearing strength, effectively extrudes soft sandy soil layers around the tunnel face, and seals seepage of water in the water-rich sandy soil layer.
Description
Technical Field
The invention relates to a bi-component sodium silicate solution composite polyurethane foam material and a grouting reinforcement technology of a water-rich sandy soil layer of a tunnel face of a subway shield tunnel by utilizing the material, in particular to a grouting reinforcement technology of a sandy soil layer of a tunnel face of a construction area of a subway shield tunnel in a water-rich environment.
Background
The shield tunneling is a high-efficiency and safe high-end equipment technology widely adopted in the construction of urban subways at home and abroad at present, and the shield tunneling is a recognized difficult problem in the field of subway construction under the geological condition of a water-rich sandy soil layer.
The excavation of tunnel makes the surrounding rock that supports the tunnel cave body excavated, faces (refer to the working face of tunnel, well, ore deposit etc.) the back and appears face (blade disc place ahead cavity), and surrounding rock stress redistribution leads to the surrounding rock to the tunnel clearance direction deformation. When encountering water-rich sandy soil stratum, the sandy soil collapses under the soaking in water or mechanical disturbance due to the abundant urban groundwater and poor water retention property, and meanwhile, a certain gap exists between the shield and the sandy soil layer, so that seepage of water-sand mixture in front of the face of the cutterhead cannot be sealed.
In the urban subway construction of China in recent years, a few very serious stratum collapse accidents continuously occur, and huge economic loss and casualties are caused. The root cause is that the stratum collapse with larger volume is gradually caused by slow loss of water and sand in front of the palm face of the cutter head of the shield machine when the shield machine is stopped for maintenance, the cutters are replaced and the tunnel entrance (vertical shaft) is accessed.
This phenomenon has attracted considerable attention from the engineering community, and several solutions have been developed in succession to solve the above-mentioned technical problems.
The method for filling the cavity in front of the cutterhead by pouring concrete or mortar from the ground and filling water-flow-resistant dispersible mortar or bentonite composite material and the like has the scheme that the cavity in front of the cutterhead is difficult to solidify in rich water environment, the cavity in front of the cutterhead is difficult to fill, and meanwhile, serious side effects such as solidifying the cutterhead, a cutter or a shield can be generated.
A large amount of polyurethane grouting material is poured, and the foaming property of the polyurethane grouting material is utilized to fill the cavity in front of the cutterhead, but the traditional polyurethane grouting material is easy to disperse and run off by water flow in water; the foaming multiple is higher (more than 10 times or more than 15 times), and the bearing strength is basically absent; there are side effects of adhering cutterhead, cutter or shield; the foam body is inflammable, and the ignition accident and the like are easy to happen in mechanical overhaul in a hole, so the scheme has very limited application reliability.
Disclosure of Invention
First, the technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides the bi-component sodium silicate solution composite polyurethane foam material which is used for grouting construction of a water-rich sandy soil layer on a tunnel face of a subway shield tunnel, and an efficient grouting technology is adopted to fill and grouting cavities of the water-rich sandy soil layer on the tunnel face, so that secondary disaster accidents such as fire combustion or high-temperature smoke production endangering surrounding environment personal health and the like can be effectively prevented when the water-rich sandy soil layer is mechanically overhauled, a cutter head is replaced and the like during shutdown of the shield machine and the tunnel entering and exiting period, the water-sandy soil layer is prevented from losing and collapsing under the softening of the water-rich environment for a longer period, and the stratum is seriously collapsed, and meanwhile, the material has the advantages of high flame retardant level, high-temperature smoke production safety and the like; meanwhile, the material can not bond a cutter head, a cutter and a shield body in the consolidation process, and the risk of normal tunneling production of the shield machine can not be influenced.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
a bi-component sodium silicate solution composite polyurethane grouting material comprises the following components in volume ratio of 1:1 and a B component, the a component comprising: 85-95% of sodium silicate solution by mass percent; 4-14% of polyether polyol composite catalyst; 0.1 to 1 percent of surfactant.
The component B comprises the following components: 83-90% by mass of a polymeric MDI prepolymerized with a polyether polyol; 8-15% of organic flame retardant; 1 to 2 percent of organic silicon foam stabilizer.
After the component A and the component B are mixed, the foaming multiple is 7-10 times, and the bearing strength of the foaming body is 0.5-1 MPa.
In the component A, the polyether polyol composite catalyst is a mixture of polyether polyol and imidazole or modified amine solution, the polyether polyol is one or more of triol, tetrol and/or pentatomic alcohol, and the mass ratio of the polyether polyol to the imidazole or modified amine solution is 1:1-1:10.
In the component A, the surfactant is any one or a mixture of a plurality of primary alcohol, secondary alcohol, dodecyl trimethyl ammonium chloride, polyoxyethylene tridecyl ether or castor oil polyoxyethylene ether esters.
In the component B, the polyether polyol is polyoxyethylene or polyoxypropylene polyether polyol with a difunctional degree and a molecular weight of 1000-3000 in the polymerized MDI (diphenylmethane diisocyanate) which is prepolymerized by the polyether polyol.
In the component B, the mass percent of polyether polyol in the polymeric MDI is 10-30%, the mass percent of the polymeric MDI is 70-90%, and the prepolymer reaction is realized by standing for 6 hours at normal temperature after the polyether polyol and the polymeric MDI are mixed in proportion.
In the component B, the organic flame retardant is one or a mixture of TCEP, TCPP, TEP, DMMP.
After the component A and the component B are mixed, the foaming multiple is 7-10 times, and the bearing strength of the foaming body is 0.5-1 MPa.
The invention also provides application of the foaming material in grouting reinforcement of the water-rich sand layer of the tunnel face of the subway shield tunnel. The component A and the component B of the foaming material are fed into a cavity from grouting matched in a shield to the front of a shield cutter head through a grouting pump and a grouting gun with a fixed volume ratio of 1:1, and are rapidly solidified and filled in the cavity.
(III) beneficial effects
The invention has the technical effects that: the bi-component sodium silicate solution composite polyurethane grouting material is injected into muddy water and sandy soil environment with complex conditions, then the water in the cavity is drained and squeezed out by rapid foaming expansion, and meanwhile, the liquid density is high (1.4 g/cm) 3 Left and right) and the inorganic/organic complex is injected into the rich water environment and cannot be dispersed, diluted or dissolved by water.
The foaming body is expanded to integrally fill the cavity in front of the face of the blocking shield cutter head, and meanwhile, the foaming multiple is low, the expansion body has certain bearing strength, can effectively squeeze soft sand soil layers around the face, seals seepage of water in the water-rich sand soil layer, and avoids serious potential safety hazards that surrounding rocks of nearby urban strata collapse are caused by seepage of water in the water-rich sand soil layer.
Meanwhile, the grouting material foaming expansion concretion body is difficult to bond the shield machine cutterhead and the shield steel body due to the fact that the grouting material foaming expansion concretion body contains inorganic silicic acid gel and sodium carbonate components with higher components (more than 60% by weight) and is different from the traditional chemical grouting foaming material (pure organic polymer material) which is easy to bond the shield machine cutterhead, the cutter or the shield steel body strongly, and normal production and operation of the shield machine are affected. Meanwhile, the pollution to the underground water is less when the water is injected into the rich water environment, and the nontoxic and harmful substances are dissolved or volatilized into the environment water. Meanwhile, the inorganic silicate foaming consolidated material has high flame retardant level which reaches more than B1 level and oxygen index which reaches more than 30%, and serious secondary disaster accidents of ignition caused by spontaneous combustion of the material due to equipment maintenance fire or other conditions in a hole can be avoided. Meanwhile, the material has small toxicity and good safety in high-temperature smoke production, and can not cause secondary disaster accidents such as harm to the personal health of surrounding environments due to high-temperature smoke production under complex conditions.
Detailed Description
The present invention will be described in detail with reference to specific embodiments thereof for better explaining the present invention.
The embodiment of the invention provides a bi-component sodium silicate solution composite polyurethane grouting material, which comprises a component A and a component B in a volume ratio of 1:1.
The component A comprises the following components: 85-95% of sodium silicate solution by mass percent; 1-15% of polyether polyol composite catalyst; 0.1-1% of surfactant;
the component B comprises the following components: 50-90% by mass of a polymeric MDI prepolymerized with a polyether polyol; 5-15% of organic flame retardant; 1 to 2 percent of organic silicon foam stabilizer.
The component A and the component B are mixed outside a shield through a double-liquid grouting device, are injected into a cavity in front of a shield cutter head within five meters, quickly foam and expand for about 20 seconds to squeeze water out of the cavity, and are integrally filled in the cavity. The viscosity of the bi-component slurry is rapidly increased to 1000-3000 Pa.s within 10 seconds after the bi-component slurry is mixed in a grouting gun, the mixed slurry is poured under a grouting pump pressure for 10 seconds and then is poured into a water-rich cavity of a tunnel face of a cutter head of a shield machine, the slurry is not easy to disperse and dilute by water, directly sinks into the bottom of the water-rich cavity, is rapidly foamed, expanded and solidified, and is used for draining water and flowing sandy soil in the environment and effectively solidifying in sandy soil gaps or gaps; the foaming multiple is controlled to be 7-10 times, and the bearing strength reaches 0.5-1 MPa.
The aqueous solution of sodium silicate is compounded with polyurethane grouting material system, the reaction process is relatively complex, including three kinds of chemical reaction processes:
1) The water in the sodium silicate solution reacts with isocyanate groups in the polymeric MDI to produce organic amines and carbon dioxide:
mH 2 O+R 1 -[N＝C＝O] n →[N＝C＝O] n-m -R 1 -[NH 2 ] m +mCO 2 ↑
2) The organic amine generated in the first step reacts with isocyanate in the polymeric MDI to generate a polyurethane or polyurea resin network type structure with a complex structure:
3) The carbon dioxide generated in the first step reacts with sodium silicate gel of sodium silicate aqueous solution to generate an inorganic sodium carbonate and inorganic silicon gel type network structure:
CO 2 +Na 2 O·xSiO 2 ·yH 2 O→Na 2 CO 3 +(SiO 2 )x(H 2 O)y
in the reaction system, the balance cooperativity of each reaction is realized by controlling the concentration of the nano silicate solution of the component A and selecting the content of isocyanate functional groups in the polymeric MDI of the component B, the generation amount of carbon dioxide is controlled, and the state and the level of the polyurethane/polyurea resin body type structure are controlled, so that the special performances of the foaming multiple and the strength of the nano sodium silicate solution composite polyurethane grouting material are realized.
In the component A, the polyether polyol composite catalyst is a mixture of polyether polyol and imidazole or modified amine solution, the polyether polyol is one or more of triol, tetrol and/or pentatomic alcohol, and the mass ratio of the polyether polyol to the imidazole or modified amine solution is 1:1-1:10.
In the component A, the surfactant is any one or a mixture of a plurality of primary alcohol, secondary alcohol, dodecyl trimethyl ammonium chloride, polyoxyethylene tridecyl ether or castor oil polyoxyethylene ether esters. The surfactant is favorable for stabilizing micelle particles of the nano silicate solution, stabilizing the viscosity of the solution, dispersing and dissolving the catalyst and also favorable for the reaction activity of the nano micelle sodium silicate solution.
The component A is nano-micelle sodium silicate solution with higher Baume degree of about 49-55 DEG Be by adopting polyether polyol composite catalyst and special surfactant; the viscosity is less than 600mPa.s, and is very suitable for grouting process requirements. The particle size of the sodium silicate micelle in the sodium silicate solution is in the range of 50 nm-100 nm, the sodium silicate micelle is easy to be compatible with the component B and react faster, and the synergistic reaction of the small-scale molecular mixture and the organic/inorganic mutual transmission network is easy to realize. Therefore, the slurry is favorable for the rapid increase of the consistency after being mixed, thereby being not easy to be dispersed and diluted by water, and the reaction effect according to the expected design can be realized.
The particle size of the general sodium silicate solution micelle is about 500 μm or more, the lower viscosity characteristic under the high baume degree is difficult to realize, for example, the viscosity of the general sodium silicate solution with the baume degree of 49-55 DEG Be is at least about 1000mPa.s or more, the solution is in a turbid state, the solution is difficult to mix with other organic liquids, the expected effect of mutual transmission synergistic reaction with polymeric MDI at a small molecular scale is also difficult to realize, and the slurry consistency is also difficult to realize the instant synergistic reaction after mixing so as to quickly increase.
In the component B, the polyether polyol is polyoxyethylene or polyoxypropylene polyether polyol with a difunctional degree and a molecular weight of 1000-3000 in the polymerized MDI (diphenylmethane diisocyanate) which is prepolymerized by the polyether polyol.
In the component B, the mass percent of polyether polyol in the polymeric MDI is 10-30%, the mass percent of the polymeric MDI is 70-90%, and the prepolymer reaction is realized by standing for 6 hours at normal temperature after the polyether polyol and the polymeric MDI are mixed in proportion.
In the component B, the organic flame retardant is one or a mixture of more of TCEP (tri (2-chloroethyl) phosphate), TCPP (tri (2-chloropropyl) phosphate), TEP (triethyl phosphate) and DMMP (dimethyl methylphosphonate). The addition of the organic flame retardant further improves the flame retardant property of the foaming material.
In the component B, the organosilicon foam stabilizer is specifically an allyl ether or vinyl oxide ether modified organosilicon surfactant, can be stabilized in the solution of the polymeric MDI which is prepolymerized by polyether polyol, has good intersolubility, does not react for a long time and has stable performance, such as foam stabilizers of TEGOSTAB 8404, TEGOSTAB 8870, TEGOSTAB 8871 and the like produced by Yingchang solid Seisaku company; polyurethane aids 8875, 8876, etc. manufactured by Nanjibu corporation.
After the component A and the component B are mixed, the foaming multiple is 7-10 times, and the bearing strength of the foaming body is 0.5-1 MPa.
Example 1
Taking 85% by mass of sodium silicate solution, 14% by mass of polyether triol composite imidazole catalyst and 1% by mass of surfactant, and mixing and stirring to form a clear and transparent A-component homogeneous solution. Wherein the mass ratio of the polyether triol to the imidazole in the polyether triol composite imidazole catalyst is 1:5, and the surfactant is dodecyl trimethyl ammonium chloride.
Taking 85% by mass of polyether polyol prepolymerized polymeric MDI; 13 mass percent of organic flame retardant; and mixing and stirring the 2% by mass of the organic silicon foam stabilizer to form the B-component organic liquid. Wherein the polyoxyethylene polyether polyol with the difunctional molecular weight of 2000 is selected from the polymeric MDI with the polyether polyol prepolymer, and the mass ratio of the polyether polyol to the polymeric MDI is 2:8.
after mixing the a and B components, the viscosity increased rapidly to 2400mpa.s within 7 seconds, and after foaming stabilized to 8 times the original volume, the foam was tightly bonded and the foam was able to rapidly push away the water already in the space without being dispersed and diluted by water. Experiments on the bearing strength of the foam body show that the foam body can bear at least 1MPa without collapsing.
Combustion performance B of foamed consolidated body after mixing component A and component B 1 The oxygen index reaches 30% above, and the tobacco toxicity produced by the material at high temperature reaches ZA in a grading way 1 The above.
Description of grouting Process
The grouting material provided by the embodiment of the invention utilizes a double-liquid advanced grouting hole arranged in a shield machine in a subway shield tunnel, and the A component and the B component are injected into a water-rich cavity in front of a shield cutter head through a grouting pump and a grouting gun with a fixed volume ratio of 1:1.
The slurry at the tail of the shield machine flows out or not at any time, if the slurry at the tail flows out, the grouting can be properly stopped for about 10 seconds, and the grouting is continued after the flowing slurry is solidified.
And observing the grouting pressure of the grouting pump, and stopping grouting when the grouting pressure starts to rise and continuously reaches 5MPa or more, so that the cavity in front of the cutterhead is basically filled and solidified, and the expected effect is achieved.
When the grouting is stopped, the A, B component suction pipe of the grouting pump is inserted into a clean water bucket, and the clean water is used for grouting to wash the whole grouting pipeline, in particular to a grouting pipe fixed on a shield machine, so that the grouting pipe cannot be solidified by the slurry, and the grouting pipe can be used normally again when the next grouting is ensured.
After stopping grouting, the special grouting gun for grouting is disassembled, at least 50L of clean water is used for cleaning the systems such as a pump grouting cylinder, a grouting gun and the like, and the cleaned water is recovered and assembled and is uniformly treated on the ground.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A bi-component sodium silicate solution composite polyurethane foaming material comprises the following components in volume ratio of 1:1 and B, characterized in that,
the component A comprises the following components: 85-95% of sodium silicate solution by mass percent; 4-14% of polyether polyol composite catalyst; 0.1-1% of surfactant;
the component B comprises the following components: 83-90% by mass of a polymeric MDI prepolymerized with a polyether polyol; 8-15% of organic flame retardant; 1-2% of organic silicon foam stabilizer;
in the component A, the polyether polyol composite catalyst is a mixture of polyether polyol and imidazole or modified amine solution, and the polyether polyol is one or a mixture of more of triol, tetrol and/or pentatomic alcohol; the mass ratio of the polyether polyol to the imidazole or modified amine solution is 1:1-1:10;
in the component A, the surfactant is any one or a mixture of a plurality of primary alcohol, secondary alcohol, dodecyl trimethyl ammonium chloride, polyoxyethylene tridecyl ether or castor oil polyoxyethylene ether esters;
the component A is a nano-micelle sodium silicate solution, the viscosity is less than 600mPa.s, and the particle size of the nano-micelle sodium silicate is 50-100 nm.
2. The foam material according to claim 1, wherein the foaming ratio of the mixed A component and B component is 7-10 times, and the bearing strength of the foam is 0.5-1 MPa.
3. The foam according to claim 1 or 2, wherein in the B component,
in the polymeric MDI prepolymerized with polyether polyols, the polyether polyol is a polyoxyethylene-based or polyoxypropylene-based polyether polyol having a difunctional molecular weight of 1000 to 3000.
4. The foam material according to claim 1 or 2, wherein in the component B, the mass percentage of polyether polyol in the polymeric MDI which is prepolymerized by polyether polyol is 10-30%, the mass percentage of polymeric MDI is 70-90%, and the prepolymer reaction is realized by standing for 6 hours at normal temperature after the polyether polyol and the polymeric MDI are mixed by stirring in proportion.
5. The foam of claim 1 or 2, wherein the organic flame retardant in component B is a mixture of one or more of TCEP, TCPP, TEP, DMMP.
6. The grouting application of the foaming material in the water-rich sand soil layer of the tunnel face of the subway shield tunnel.
7. The grouting application of claim 6, wherein the A component and the B component of the foaming material are fed into a cavity in front of a shield cutter head from matched grouting arranged in a shield through a grouting pump and a grouting gun with a fixed volume ratio of 1:1, and are rapidly cured and filled in the cavity.
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| CN102718462A (en) * | 2012-07-09 | 2012-10-10 | 杭州国电大坝安全工程有限公司 | Chemical grouting material for reinforcing loose and broken bedrock |
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| CN104558514A (en) * | 2014-12-26 | 2015-04-29 | 北京瑞诺安科新能源技术有限公司 | High-strength polyurethane modified silicate grouting reinforcement material as well as preparation method and application thereof |
| JP2022038054A (en) * | 2020-08-26 | 2022-03-10 | 東ソー株式会社 | Grouting chemical composition for bedrock solidification |
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| CN102718462A (en) * | 2012-07-09 | 2012-10-10 | 杭州国电大坝安全工程有限公司 | Chemical grouting material for reinforcing loose and broken bedrock |
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