CN104844129A - Modified thixotropic slurry and preparation method thereof - Google Patents
Modified thixotropic slurry and preparation method thereof Download PDFInfo
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- CN104844129A CN104844129A CN201510207784.XA CN201510207784A CN104844129A CN 104844129 A CN104844129 A CN 104844129A CN 201510207784 A CN201510207784 A CN 201510207784A CN 104844129 A CN104844129 A CN 104844129A
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Abstract
The invention provides a modified thixotropic slurry. The slurry comprises components of, by mass, 100 bentonite, 80 to 110 water, 8 to 15 sodium carbonate, 60 to 100 white plaster, 0.5 to 2 parts of flocculant and 0.2 to 0.4 of emulgator. The invention further provides a preparation method of the modified thixotropic slurry. The modified thixotropic slurry is provided with resistance reduction thixotropy and solidification properties and good consistence and can form outstanding slurry sleeves to produce certain support, and accordingly, the safety and the reliability of the soil mass on the upper portion during jacking of jacking pipes can be guaranteed, and soil mass collapse and road surface sinking are prevented.
Description
Technical field
The present invention relates to a kind of thixotropic slurry, particularly relate to a kind of modification thixotropic slurry and compound method thereof.
Background technology
Slurry Balanced Pipe Jacking Construction is one of important method in no-excavation construction method, is traditional operating technique, due to the uniqueness that its technology has, still in each engineering field, plays huge effect so far.The construction of mire water equilibrium tube trenchless technology is generally applied in city construction engineering construction, along with the development of urban construction, the quickening of especially reconstruction of the old city town, sewage disposal upgrading, the quality of jacking construction directly affects the stable of earth's surface and ground structures.In Slurry Balanced Pipe Jacking Construction, because the geologic condition on stratum is different, part push pipe needs the space to its tube wall by location, unconsolidated formation carries out backfill grouting, its effect is stable push pipe, improve its strained condition, prevent tube wall side Zhou Tuti from caving in and causing the unstability of ground settlement or Surface structure.
Some road is major trunk roads, vehicle flowrate is large, neighbouring building site is many, heavy vehicle walking is frequent, geology soil easily caves in for silt, jacking construction under this road surface, under vehicle to run dynamic load, this type of soil more easily caves in, and some urban road is that newly-built road does not allow excavation to destroy, grouting and reinforcing cannot be carried out along the line in advance to pipeline in working-yard, in jacking construction, the Stability Control of the soil body is just seemed most important, mud off and push pipe is directly affected on the quality of soil solidifying effect the soil body whether can be avoided to cave in, successfully run through under the prerequisite of road surface subsidence, in this case common thixotropic slurry cannot be competent at.
Publication number is vacuum grouting cement slurry and the manufacture method thereof that CN102432250A provides a kind of high solidity, belongs to prestress engineering technical field.Manufacture (1) according to the following steps and prepare raw material by following component and weight content: silicate cement 300 parts; Poly carboxylic acid series water reducer 2.7 ~ 3.9 parts; Polycarboxylic acid series retardant 1.5 ~ 2.4 parts; 93 ~ 99 parts, water; Slurry thixotropic agent 3 ~ 6 parts; (2) first water is injected slurry stirred pot, add poly carboxylic acid series water reducer and polycarboxylic acid series retardant simultaneously and mix; (3) add cement while stirring, within 4 ~ 6 minutes, obtain slow setting slurry containing the blanking time interior stirring altogether; (4) slurry hold tank slow setting slurry being placed in belt stirrer leaves standstill 1 hour; (5) start agitator to stir, add slurry thixotropic agent while stirring, continue stirring 15 ~ 30s after adding slurry thixotropic agent and obtain thixotroping slurry.This thixotroping slurry can once grouting complete bending larger pipeline, substantially increases working efficiency and construction quality.Publication number be CN102250597B patent discloses a kind of grouting slurry for unconsolidated strata, this grouting slurry for unconsolidated strata comprises following component: wilkinite 10.8-66kg/m
3, soda ash 3-6kg/m
3, cement 27-28kg/m
3, water glass 17-39kg/m
3, flyash 30-38kg/m
3, fine sand 100-161kg/m
3, water reducer feero-chromo-lignosulfonate 6.5-12kg/m
3, linking agent Tai-Ace S 150 or sodium sulfate 2.5-4kg/m
3, hydro-polyacrylamide 0.15-0.24kg/m
3, hydrolyzed polyacrylonitrile 1.4-3.2kg/m
3and the water of equal amount.This mud can change geologic framework, ensure under scall geologic condition, complete the pipe level directional drilling of the long distance of heavy caliber, but this mud can not form the mud skin of high-quality to support the soil body, can not solidify voluntarily and effectively be combined with surrounding soil, the soil body therefore cannot be avoided to cave in road surface subsidence.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of modification thixotropic slurry, existing drag reduction thixotropy has curability again, also there is good denseness and can form the certain supportive of premium mud cover generation, the safety of the soil body above it and stable can be ensured in push pipe jack-in process, avoids the soil body to cave in road surface subsidence.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
A kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Wilkinite 100
Water 800-1100
Sodium carbonate 8-15
Lime cream 60-100
Flocculation agent 0.5-2
Retardant 0.5-2
Emulsifying agent 0.2-0.4
Wilkinite is the topmost composition of thixotropic slurry, has very high activity, very large swelling property, water-absorbent, plasticity index gene swapping ability, and its main component is silicon-dioxide, and the main component of lime cream is Ca (OH)
2, it and silicon-dioxide generation chemical reaction combine: 5SiO
2+ 5Ca (OH)
2﹦ 5CaO.5SiO
2.H
2o+H
2o, generates hard Calucium Silicate powder, and hard Calucium Silicate powder can solidify in the presence of water voluntarily, therefore is hydraulic material, also can accelerate sclerosis while temperature improves, modification thixotropic slurry can be solidified voluntarily.
Sodium carbonate Na
2cO
3be one of thixotropic slurry main component, its effect is to provide ion, impels ion-exchange, changes wilkinite surface adsorption, impels Granular composite, thus controls all technical of modification thixotropic slurry.Na
2cO
3in Na ion can with the active SiO in wilkinite
2phase chemical combination, forms Na
2siO
3.H
2o and water glass, this is also the reason that colloid is formed, and therefore the consumption of sodium carbonate is larger, and the denseness of mud is larger.
Lime cream Ca (OH)
2mud can be made after mixing bentonite slurry to solidify voluntarily, and very fast through field test mud setting rate, therefore the present invention suitably adds retardant, ensures that mud keeps rheological in jack-in process.
Modification thixotropic slurry denseness can be large many relative to regular mud, can bring the trouble of plug pipe, therefore present invention adds appropriate emulsifying agent, ensure the mobility of modification thixotropic slurry to slip casting.
Preferably, wilkinite of the present invention is sodium bentonite.Wilkinite is divided into calcium-base bentonite and sodium bentonite, what absorption calcium ion was many is calcium base, what absorption sodium ion was many is sodium bentonite, in powder sandy soil, sodium bentonite drag-reduction effect is more obvious, its containing one deck very thin silicate more than calcium-base bentonite, easily pore structure is formed during montmorillonite small-particle in wilkinite is combined, thus make the bloating tendency increase of slurries, good fluidity after thixotroping, staticly get off to have gelling and solidified nature, therefore the present invention selects sodium bentonite as the wilkinite of push pipe.
Preferably, flocculation agent of the present invention be polyacrylamide,
calcium polyacrylate (CPA), methacrylic acid, bodied ferric sulfate, poly-silicic acid iron sulfate, aluminum chloride, one or more in iron(ic) chloride.Adsorption is of great significance mud tool, alta-mud modification, configures dissimilar mud, regulates and improve the performance etc. of mud, is to the adsorption of chemical processing agent and change bentonite clay particle surface property and realize by wilkinite.
Preferably, described flocculation agent is polyacrylamide, poly-silicic acid iron sulfate and aluminum chloride, and its ratio is 2:2:1.
Polyacrylamide, poly-silicic acid iron sulfate and aluminum chloride are added in mud, first with wilkinite generation adsorption, then can be adsorbed in mire water equilibrium tube process on soil mass crack or pore wall, and polyacrylamide can also play the effect of antifriction resistance.Polyacrylamide stability is higher, can with ionogen and promoting agent compatible, the effect of dispersion can also be played, make the solid dispersal particle in suspension fully wetting and dispersed by liquid phase, between particle because of electrostatic repulsion away from, reach good dispersion effect.In addition, polyacrylamide, poly-silicic acid iron sulfate and aluminum chloride can produce multipoint adsorption in soil body surface, and can form finer and close adsorption film in soil body surface, the free water that slowed down is to the speed of soil body penetration.
Preferably, retardant of the present invention is glucose.Glucose C
6h
12o
6it is a kind of cement setting retarder, be applicable to the bentonite slurry mixing lime, can not solidify in such modification thixotropic slurry short period of time, after jacking is complete, can solidify voluntarily after pipeline meets water, also can urge it in time to solidify, pipe ends be closed and passes into steam, can solidify in the short period of time when 50 DEG C.In addition, can mix at the mud injected before in the end pipeline section jacking and add setting accelerator, after pipeline jacking is completed, mud quick solidification.
Preferably, emulsifying agent of the present invention is sodium abietate.Sodium abietate is hgh-performance emulsified dose, effectively can improve the mobility of mud after mixing mud.
In addition, bentonitic colloid index is very large to the performance impact of mud, the present invention is before preparation modification thixotroping mud, first determine bentonitic colloid index, then proportioning is determined according to colloid index, colloid index is divided into level Four: 60-70,70-80,80-90,90-100, determines four kinds of proportionings of modification thixotropic slurry according to different colloid index.
Preferably, a kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 90-100
Water 1100
Sodium carbonate 8
Lime cream 100
Polyacrylamide 0.8
Silicic acid iron sulfate 0.8
Aluminum chloride 0.4
Glucose 2
Sodium abietate 0.4.
Preferably, a kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 80-90
Water 980
Sodium carbonate 9.5
Lime cream 90
Polyacrylamide 0.6
Silicic acid iron sulfate 0.6
Aluminum chloride 0.3
Glucose 1.6
Sodium abietate 0.3.
Preferably, a kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 70-80
Water 920
Sodium carbonate 12.5
Lime cream 75
Polyacrylamide 0.4
Silicic acid iron sulfate 0.4
Aluminum chloride 0.2
Glucose 1.0
Sodium abietate 0.25.
Preferably, a kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 60-70
Water 800
Sodium carbonate 15
Lime cream 60
Polyacrylamide 0.2
Silicic acid iron sulfate 0.2
Aluminum chloride 0.1
Glucose 0.5
Sodium abietate 0.2.
Another technical problem that the present invention will solve is to provide the compound method of above-mentioned modification thixotropic slurry.
For solving the problems of the technologies described above, technical scheme is:
A compound method for modification thixotropic slurry, the method includes the steps of:
(1) be, by moisture three parts, a part adds in agitation vat; Second section is used for dissolving sodium carbonate, and Part III is for dissolving retardant;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with the second section water described in step (1) sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by the Part III water dissolution of retardant described in step (1), after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
Preferably, in described step (1), the weight ratio of dissolving sodium carbonate water used and sodium carbonate is 2-5:1.
Preferably, in described step (1), the weight ratio of dissolving retardant water used and retardant is 2-8:1.
Therefore compared with prior art, the present invention has following beneficial effect:
1) maintain the lubrication drag reduction thixotropy of common thixotropic slurry, friction resistance during push pipe jacking can be reduced; The increase of denseness can form premium mud cover, has good filling up and retaining wall anti sloughing effectiveness, has certain temporary support to the soil body; Supporter can be solidify to form voluntarily after mud slip casting completes, there is good curability.During slip casting, the space produced between pipeline and the soil body when can fill up construction from the modification thixotropic slurry of grouting hole injection, suppresses the development of soil layer loss.After mud contacts with the soil body, under the effect of grouting pressure, the slurries injected will to soil layer infiltration and diffusion, moisture was to the hole infiltration between soil body particle before this, then be that mud is to the hole infiltration between soil body particle, when becoming gelinite in a short period of time after the depth of penetration that mud reaches possible, be full of the hole of the soil body, along with the continuous infiltration of mud, mud is just formed with the soil body and mixes closely knit soil structures (mud sleeve), mud sleeve can act on soil body particle grouting pressure, become effective stress compacted fill, what pipe hole was become is stable, can the soil body be effectively avoided to cave in.Silty sand ground push pipe head buries in jacking, the head top soil body can produce larger cavity due to disturbance, under grouting pressure, the thicker mud sleeve that modification thixotropic slurry is formed above pipeline, it is actual is that modification thixotropic slurry and the top soil body define the closely knit dome soil structures (as shown in Figure 1) of certain thickness, it has stronger supporting role to top silty strata under grouting pressure, and in such push pipe jacking, the stability of the top soil body is under control.Slip casting completes, after modification thixotropic slurry solidifies voluntarily, due to reducing of grout curing volume, how much small gap can be there is between mud layer and soil layer, but the dome structure that mud original shape becomes still plays the effect of support, it combines with the mud layer of solidification and to support very effectively the upper strata soil body, effectively prevent the soil body and caves in and road surface subsidence.
2) the present invention can keep the relatively stable of excavation surface, less on the impact of around soil layer, decrease the interruption of push pipe jacking, accelerate construction speed, after construction, land subsidence is minimum, larger land subsidence can not be caused and affect the safety of traffic and various utility line, security improves, effectively reduce the flour sand geology jacking construction soil body to cave in and cause the infringement on road surface, earth's surface and structures, effectively can ensure original ground and the good original state of structures, need not secondary reparation be carried out, save construction cost;
3) the present invention's construction is adopted, without the need to carrying out slip casting filling, displacement to space around tube wall and thixotropic slurry layer again after slip casting drag reduction, decrease the usage quantity of mud, the minimizing of operation makes construction cost effectively be reduced, operation is more simple, decreases material, manually, saves construction cost, accelerate speed of application, ensure that the construction period.
Accompanying drawing explanation
Fig. 1 is tube coupling soil body sectional view.
In figure, 1 is dome, and 2 is the soil body, and 3 is pipeline, and 4 is mud.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment 1
A kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 90-100
Water 1100
Sodium carbonate 8
Lime cream 100
Polyacrylamide 0.8
Silicic acid iron sulfate 0.8
Aluminum chloride 0.4
Glucose 2
Sodium abietate 0.4.
Following preparation is done according to the proportioning of above-mentioned modification thixotropic slurry:
(1), 1056 parts of water are added in agitation vat;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with 40 parts of water sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by retardant 4 parts of water dissolution, after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
Embodiment 2
A kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 80-90
Water 980
Sodium carbonate 9.5
Lime cream 90
Polyacrylamide 0.6
Silicic acid iron sulfate 0.6
Aluminum chloride 0.3
Glucose 1.6
Sodium abietate 0.3.
Following preparation is done according to the proportioning of above-mentioned modification thixotropic slurry:
(1), 953 parts of water are added in agitation vat;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with 19 parts of water sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by retardant 8 parts of water dissolution, after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
Embodiment 3
A kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 70-80
Water 920
Sodium carbonate 12.5
Lime cream 75
Polyacrylamide 0.4
Silicic acid iron sulfate 0.4
Aluminum chloride 0.2
Glucose 1.0
Sodium abietate 0.25.
Following preparation is done according to the proportioning of above-mentioned modification thixotropic slurry:
(1), 862 parts of water are added in agitation vat;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with 50 parts of water sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by retardant 8 parts of water dissolution, after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
Embodiment 4
A kind of modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 60-70
Water 800
Sodium carbonate 15
Lime cream 60
Polyacrylamide 0.2
Silicic acid iron sulfate 0.2
Aluminum chloride 0.1
Glucose 0.5
Sodium abietate 0.2.
Following preparation is done according to the proportioning of above-mentioned modification thixotropic slurry:
(1), 752 parts of water are added in agitation vat;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with 45 parts of water sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by retardant 3 parts of water dissolution, after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
After tested, the indices of modification thixotropic slurry that obtains of embodiment 1-4 is as shown in table 1.
The indices of table 1. modification thixotropic slurry
As seen from the above table, the mud that the present invention obtains has excellent degree of mobilization, multiviscosisty performance and curing performance.
A kind of modification the thixotropic slurry above embodiment of the present invention provided and compound method thereof, be described in detail, apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a modification thixotropic slurry, is characterized in that: described modification thixotropic slurry, comprises each composition of following mass fraction:
Wilkinite 100
Water 800-1100
Sodium carbonate 8-15
Lime cream 60-100
Flocculation agent 0.5-2
Retardant 0.5-2
Emulsifying agent 0.2-0.4.
2. a kind of modification thixotropic slurry according to claim 1, is characterized in that: described wilkinite is sodium bentonite; Described retardant is glucose; Described emulsifying agent is sodium abietate; Described flocculation agent is one or more in polyacrylamide, calcium polyacrylate (CPA), methacrylic acid, bodied ferric sulfate, poly-silicic acid iron sulfate, aluminum chloride, iron(ic) chloride.
3. a kind of modification thixotropic slurry according to claim 2, it is characterized in that described flocculation agent is polyacrylamide, poly-silicic acid iron sulfate and aluminum chloride, its ratio is 2:2:1.
4. a kind of modification thixotropic slurry according to claim 2, is characterized in that: modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 90-100
Water 1100
Sodium carbonate 8
Lime cream 100
Polyacrylamide 0.8
Silicic acid iron sulfate 0.8
Aluminum chloride 0.4
Glucose 2
Sodium abietate 0.4.
5. a kind of modification thixotropic slurry according to claim 2, is characterized in that: modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 80-90
Water 980
Sodium carbonate 9.5
Lime cream 90
Polyacrylamide 0.6
Silicic acid iron sulfate 0.6
Aluminum chloride 0.3
Glucose 1.6
Sodium abietate 0.3.
6. a kind of modification thixotropic slurry according to claim 2, is characterized in that: modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 70-80
Water 920
Sodium carbonate 12.5
Lime cream 75
Polyacrylamide 0.4
Silicic acid iron sulfate 0.4
Aluminum chloride 0.2
Glucose 1.0
Sodium abietate 0.25.
7. a kind of modification thixotropic slurry according to claim 2, is characterized in that: modification thixotropic slurry, comprises each composition of following mass fraction:
Colloid index is the sodium bentonite 100 of 60-70
Water 800
Sodium carbonate 15
Lime cream 60
Polyacrylamide 0.2
Silicic acid iron sulfate 0.2
Aluminum chloride 0.1
Glucose 0.5
Sodium abietate 0.2.
8. the compound method of a kind of modification thixotropic slurry according to claim 1 ~ 7 any one, is characterized in that: the method includes the steps of:
(1) be, by moisture three parts, a part adds in agitation vat; Second section is used for dissolving sodium carbonate, and Part III is for dissolving retardant;
(2), by wilkinite slowly add in agitation vat, stir;
(3), with the second section water described in step (1) sodium carbonate is dissolved, obtain sodium carbonate solution, then sodium carbonate solution is added in agitation vat, stir, then add flocculation agent and stir, obtain common thixotropic slurry;
(4), by the Part III water dissolution of retardant described in step (1), after stirring, retarder solution is obtained;
(5), by retarder solution add in lime cream, mix, obtain milk of lime;
(6), by emulsifying agent add in milk of lime, add in the common thixotropic slurry that stirring after stirring, continue to stir 5-10 minute, obtain modification thixotropic slurry.
9. the compound method of a kind of modification thixotropic slurry according to claim 8, is characterized in that: in described step (1), the weight ratio of dissolving sodium carbonate water used and sodium carbonate is 2-5:1.
10. the compound method of a kind of modification thixotropic slurry according to claim 8, is characterized in that: in described step (1), the weight ratio of dissolving retardant water used and retardant is 2-8:1.
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