CN103362522B - A kind of dry-type synchronization slip casting construction technology - Google Patents

A kind of dry-type synchronization slip casting construction technology Download PDF

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Publication number
CN103362522B
CN103362522B CN201310283260.XA CN201310283260A CN103362522B CN 103362522 B CN103362522 B CN 103362522B CN 201310283260 A CN201310283260 A CN 201310283260A CN 103362522 B CN103362522 B CN 103362522B
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dry
slurries
type
mixture
synchronous grouting
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CN103362522A (en
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覃爽
徐亚玲
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SHANGHAI URBAN CONSTRUCTION MATERIALS CO Ltd
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SHANGHAI URBAN CONSTRUCTION MATERIALS CO Ltd
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Abstract

The invention discloses a kind of dry-type synchronization slip casting construction technology, comprise the following steps: manufacture dry-type synchronous grouting dedicated mortar; The slurries mixing of synchronous grouting job site; Slurries automation is delivered to shield machine head; Shield driving synchronous grouting is carried out in tunnel construction space; Clean stock line and shield grouting equipment. Owing to adopting dry powder and mortar construction, slurries as " running water " with get with, easy to operate, the slurries slump is immediately adjustable, can make required slurries according to different operating modes, construction quality is improved; And stock line integrated arrangement, has realized slurries and has carried automation; Solve well transport, storage and the quality problems of wet pulp, break through geological restraint, be suitable for promoting in nationwide and even wider scope.

Description

A kind of dry-type synchronization slip casting construction technology
Technical field
The present invention relates to a kind of construction method, espespecially a kind of dry-type synchronization slip casting construction technology.
Background technology
Synchronous grouting refers in Shield Tunneling process, synchronizes and carries out, by note with shield drivingSlurry is filled shield tail space, to prevent a kind of construction technology of tunnel upward floating. As shield method tunnel constructionImportant step in process, synchronous grouting is for the moulding of controlling tunnel duct piece with stable, and opposing is soil aroundBody deformability, the aspects such as the water resistance in raising tunnel play very important effect.
At home and abroad all kinds of synchronization slip casting construction technologies of application respectively have pluses and minuses at present, and effect differs, butBe wet pulp grouting process. Wet pulp mostly is building-site mixing, and technological process is multifarious, mixing slurriesQuality is uneven, and the construction accident causing thus emerges in an endless stream especially, the control effect of later stage tunnel upward floatingFruit is also troubling; And wet pulp needs memory device, uses inconvenience. If adopt the construction technology of premixing wet pulp,Cost of transportation is high.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, a kind of dry-type synchronization slip casting construction technology be provided,Adopt dry powder and mortar, easy to operate, slurries as " running water " with getting with use, the slurries slump is instantAdjustable, can make required slurries according to different operating modes, uniform and stable, construction quality also can be improved,And silo grout outlet, to the stock line integrated arrangement of shield machine head, has been realized the automation that slurries are carried,Easy and simple to handle; This external enwergy solves transport, storage and the quality problems of wet pulp well, can break through region limitSystem, is suitable for promoting in nationwide and even wider scope.
In order to realize foregoing invention object, the technical solution adopted in the present invention is:
A kind of dry-type synchronization slip casting construction technology, is characterized in that: comprise the following steps:
A, manufacture dry-type synchronous grouting dedicated mortar step;
The slurries mixing step of B, synchronous grouting job site;
C, slurries automation are delivered to shield machine head step;
D, shield driving synchronous grouting step is carried out in tunnel construction space;
E, cleaning stock line and shield grouting device step.
The manufacture dry-type synchronous grouting dedicated mortar step of above-mentioned steps A, further comprises:
(1) determine dry powder synchronous grouting dedicated mortar fit quality percentage;
Flyash 18%-21%, calcium-base bentonite 3.5-4.0%, calcium hydroxide 2.5-5.0%, special dry-typeAdditive 0.12%-0.18%, sand 70%-76%; All material is pulverulent material;
Wherein the fit quality percentage of special dry-type additive is: methyl cellulose ether 0.9%~1.3%,Naphthalene water reducer 29.2%~39.2%, Escin 0.5%~0.9%, sodium bentonite 29%~45%;Calcium hydroxide 22~32%; All material is pulverulent material;
Described methyl cellulose ether is 20000-60000 viscosity, mainly plays water retention, can greatly improveThe pumpability of slurries and work persistence;
Described naphthalene water reducer, for having surface-active effect, can reduce water consumption, improve serum densityAnd then improve its water proofing property;
Wherein the mass ratio of methyl cellulose ether and naphthalene water reducer is 1:30-1:35, both mixing bothMixing there is stack humidification, can effectively strengthen water-retaining property, workability, glutinous poly-property, pumpabilityWith work persistence;
Described Escin is air entraining agent, and it is cheap, and bleed is even, can improve the mobility of slurriesAnd pumpability, but volume should allly control, cross conference the performance such as density, intensity of slurries is had unfavorableImpact;
Described sodium bentonite fineness≤20%, has good pulping performance, can improve calcium-base bentoniteProperties, it mixes the effect of mainly playing lubricant and thixotropic agent, increase slurries mobility andPumpability, improves its workability; In addition can also play the effect of thickener, improve the denseness of slurries and enterAnd improve its anti-shearing yield strength;
Described calcium hydroxide, its (CaO+MgO) content >=60%, specific area >=400m2/ Kg. DisappearLime mix the activity that can excite grey matter material in volcano in mortar, make slurries obtain certain mechanical property;
(2) with sand, dry powder and mortar stirring system relevant device is cleaned one time, guarantee free from admixture, especially notCan there is cement;
(3) above-mentioned various raw material stoving to moisture content is less than to 1%;
(4) screen cloth that is 5mm by sand by sieve diameter, screens out particle more than 5mm;
(5) preparation of special dry-type additive, its step is as follows
(5.1) various raw material stoving to moisture content is less than to 1%;
(5.2) take respectively methyl cellulose ether and Escin by formula, adopt agravic formula stirring sideFormula stirs and obtains the first mixture;
(5.3) take naphthalene water reducer by formula, mix in the first mixture that step (5.2) obtains,Adopt agravic formula agitating mode to stir and obtain the second mixture;
(5.4) take respectively sodium bentonite and calcium hydroxide by formula, adopt agravic formula agitating mode to stirMix and evenly obtain the 3rd mixture;
(5.5) the second mixture step (5.3) being obtained mixes the 3rd mixing that step (5.4) obtainsIn thing, adopt agravic formula agitating mode to stir and obtain 4 mixture;
(5.6) finally use sealing bag the 4 mixture of step (5.5) gained dress bag, described in obtainingThe special dry-type additive of synchronous grouting;
(6) take respectively calcium-base bentonite, calcium hydroxide, special dry-type additive by formula, adopt nothingThe stirring of gravity type agitating mode obtains first in 10 seconds-15 seconds and stirs the mixture;
(7) then take flyash by formula, what be added into that step (6) obtains first stirs the mixtureIn, adopt agravic formula agitating mode stirring to obtain second in 10 seconds-15 seconds and stir the mixture;
(8) finally take sand by formula, what be added into that step (7) obtains second stirs the mixture,Adopt agravic formula agitating mode to stir 20 seconds-30 seconds, obtain described dry-type synchronous grouting dedicated mortar.
The slurries mixing step of above-mentioned steps B synchronous grouting job site, further comprises:
(1) on the ground of shield synchronization slip casting job site, place the special cylinder of being with metering agitating deviceStorehouse, and connect water power;
(2) be transported to job site with powder material tank handlebar dry-type synchronous grouting dedicated mortar, and be pumped toIn silo;
(3), according to construction stage, soil layer geological condition, choose the slump of synchronous grouting slurries used;
(4) require the slump according to slurries, set initial water amount;
The slurries slump requires at 120mm-200mm, and water consumption is generally the 15-18% of siccative, collapsesSpend every increase 20mm, the mass percent calculating that initial water amount setting value increases 1%(presses dry mash);
(5) open silo blanking switch and send taps, silo agitating device to start to stir;
(6) open silo pulp switch, slurries are carried out to the slump, the test of pressure bleeding quantity;
When slump value and required value difference are in ± 20mm, when pressure bleeding quantity < 30ml, sustainableSpice; Otherwise regulating capacity setting value meets the demands slurries, can continue spice discharging.
The automation of above-mentioned steps C slurries is delivered to shield machine head step, further comprises:
(1) start to shield machine head from silo grout outlet, arrange the slurries conveyance conduit of drive;
Silo grout outlet, to active well ground segment, arranges horizontal pipe, and pipeline initial end need settle pumping to push awayMotion device, promotes power and determines according to the distance of grout outlet and active well;
Active well ground, to underground section, arranges vertical pipe or tilted tube, if vertical pipe is set, groundThe every 30 meters of need of the lower degree of depth arrange one section of horizontal pipe;
Active well ground, down to shield machine head section, arranges horizontal pipe along tunnel trend, at the beginning of active well is undergroundPumping propulsion plant need be settled in top, promotes power and determines according to the distance of active well and shield machine head;
(2) with tap water, stock line is lubricated;
Pour water from grout outlet end pipeline opening, to shield machine head end pipeline opening water outlet 5min, stop pouring water; (3)
Respectively pipe ends mouth is connected to silo grout outlet, shield machine grouting equipment;
(4) open pipeline pumping propulsion plant, mortar is transported to the shield machine head under active well, for executingWork is used.
The obvious advantage of implementing after this technology with effect is: compared with existing synchronous grouting technique, and the present inventionOwing to having adopted dry powder and mortar, easy to operate, slurries as " running water " with getting with use, and evenly steadyFixed, there is good mobility, fillibility, water-retaining property, slump retaining and anti-shearing yield strength, depositingIn storage and course of conveying, have good lasting workability, workability is better; And the slurries slump is instantAdjustable, can meet each in the construction demand of the shield synchronization slip casting under different operating modes, in time reply constructionPlant unusual condition, thereby more effectively prevent the floating in tunnel; Pipe from silo grout outlet to shield machine headRoad one is arranged, has realized the automation that slurries are carried, easy and simple to handle; In addition, the present invention can be wellThe transport and the production capacity problem that solve wet pulp, broken through regional limits, is suitable for inside and outside Shanghai City and even the whole nationThe popularization of scope.
Detailed description of the invention
Below in conjunction with instantiation, the present invention is further described:
The subway tunnel of certain shield-tunneling construction adopts dry-type synchronization slip casting construction technology of the present invention, adopt asLower step:
1. first, produce dry-type synchronous grouting dedicated mortar;
1.1 determine dry powder synchronous grouting dedicated mortar match ratio;
Flyash 20%, calcium-base bentonite 3.85%, calcium hydroxide 3.0%, special dry-type additive 0.15%,Sand 73%.
All material is pulverulent material, by percentage to the quality;
Wherein the fit quality percentage of special dry-type additive is: methyl cellulose ether 1.1%, naphthalene systemWater reducer 33.2%, Escin 0.7%, sodium bentonite 35%, calcium hydroxide 30%;
Methyl cellulose ether used is CMC ether, viscosity 40000;
Naphthalene water reducer used is technical grade;
Wherein the mass ratio of methyl cellulose ether and naphthalene water reducer is 1:30.2;
Escin used is technical grade;
The fineness of sodium bentonite used is 18%;
Slaked lime powder used, (CaO+MgO) % is 68%, specific area 420m2/Kg。
1.2 use sand clean dry powder and mortar stirring system relevant device;
1.3 are less than 1% by above-mentioned various raw material stoving to moisture content;
1.4 screen clothes that are 5mm by sand by sieve diameter, screen out particle more than 5mm;
The preparation of 1.5 special dry-type additives, its step is as follows:
1.5.1 take respectively 1 ton of methyl cellulose ether and soap that special dry-type additive is required by formulaChitin, adopts agravic formula agitating mode to stir and obtains the first mixture;
1.5.2 taking 1 ton of required naphthalene of the special dry-type additive of synchronous grouting by formula is diminishingAgent, mixes in the first mixture that step (1.5.1) obtains, and adopts agravic formula agitating mode to stir allEven second mixture that obtains;
1.5.3 take respectively the required sodium base of 1 ton of special dry-type additive of synchronous grouting by formula swollenProfit soil and calcium hydroxide, adopt agravic formula agitating mode to stir and obtain the 3rd mixture;
1.5.4 it is the 3rd mixed that the second mixture step (1.5.2) being obtained mixes that step (1.5.3) obtainsIn compound, adopt agravic formula agitating mode to stir and obtain 4 mixture;
(1.5.5) finally use sealing bag the 4 mixture of above-mentioned steps (1.5.4) gained by 40Kg/Every packed bag, obtains the described special dry-type additive of tunnel synchronous grouting.
1.6 take respectively calcium-base bentonite, calcium hydroxide, special dry-type additive by formula, adopt without heavyThe stirring of power formula agitating mode obtains first for 12 seconds and stirs the mixture;
Then 1.7 take flyash by formula, and what be added into that step 1.6 obtains first stirs the mixture,Adopting agravic formula agitating mode stirring within 12 seconds, to obtain second stirs the mixture;
1.8 finally take sand by formula, and what be added into that step 1.7 obtains second stirs the mixture, and adoptsAgravic formula agitating mode stirs 25 seconds, obtains described dry-type synchronous grouting dedicated mortar;
2. the slurries mixing of then, carrying out in synchronous grouting job site;
2.1 place the special silo of band metering agitating device on ground, building site, and connect water power;
2.2 use powder material tank handlebar dry-type synchronous grouting dedicated mortars are transported to job site, and are pumped to cylinderIn storehouse;
2.3 according to construction stage, soil layer geological condition, and the slump of choosing synchronous grouting slurries used is160mm;
2.4 require the slump according to slurries, and setting initial water amount is 16%;
2.5 open silo blanking switch and send taps, silo agitating device to start to stir;
2.6 open silo pulp switch, and slurries are detected, and the slump is 170mm, pressure bleeding quantityFor 22ml, size performance meets the requirements, and sustainable spice, therefore fixing water consumption setting value.
3. then, slurries automation is delivered to shield machine head;
3.1 start to shield machine head from silo grout outlet, arrange the slurries conveyance conduit of drive;
Silo grout outlet, to active well ground segment, arranges 5 meters of horizontal pipes, and settles in pipeline initial endPump motor, power of motor 15kw;
Active well ground, to underground section, arranges 12 meters of vertical pipes;
Active well ground, down to shield machine head section, arranges 20 meters of horizontal pipes along tunnel trend, active well groundLower initial end is settled pump motor, power of motor 20kw;
3.2 use tap waters are lubricated stock line, fill with running water, to shield from grout outlet end pipeline openingStructure head end pipeline opening water outlet 5min, stops pouring water;
3.3 are connected to silo grout outlet, shield machine grouting equipment pipe ends mouth respectively;
3.4 open pipeline pumping propulsion plant, mortar are transported to the shield machine head under active well, for constructionUse.
4. then, shield driving synchronous grouting is carried out in tunnel construction space, slip casting process is smooth, without stifledPlug, interruption situation occur;
5. last, after this time slip casting finishes, clean stock line and shield grouting equipment.
Adopt the constructing tunnel of dry-type synchronization slip casting construction technology of the present invention smooth, effect is good,See and can control preferably tunnel upward floating distortion from Ground Subsidence Monitoring data.
It is as follows that synchronous grouting dedicated mortar specifically detects index:
1, the initial slump is 210mm ± 5mm, and 2 hours slumps are 200mm ± 5mm, within 4 hours, collapseDegree of falling is 190mm ± 5mm, (it is 5mm that slump value changes least unit)
2, slurry apparent density is 2.0-2.1g/cm3
3, pressure bleeding value is 15ml---between 35ml
4,20 hours shear yield strengths are 900---1600Pa.
5, sedimentation value is 5mm-9mm.

Claims (7)

1. a dry-type synchronization slip casting construction technology, is characterized in that: comprise the following steps:
A. manufacture dry-type synchronous grouting dedicated mortar step;
B. the slurries mixing step of synchronous grouting job site;
C. slurries automation is delivered to shield machine head step;
D. shield driving synchronous grouting step is carried out in tunnel construction space;
E. clean stock line and shield grouting device step;
Wherein, described manufacture dry-type synchronous grouting dedicated mortar step, further comprises as followsStep:
(1) determine that dry powder synchronous grouting dedicated mortar match ratio is: flyash 18%-21%, calcium-base bentonite3.5-4.0%, calcium hydroxide 2.5-5.0%, special dry-type additive 0.12%-0.18%, sand 70%-76%;All material is pulverulent material, by percentage to the quality;
Wherein, special dry-type additive match ratio is:: methyl cellulose ether 0.9%~1.3%, naphthalene systemWater reducer 29.2%~39.2%, Escin 0.5%~0.9%, sodium bentonite 29%~45%; Calcium hydroxide 22~32%; All material is pulverulent material, by percentage to the quality;
Described methyl cellulose ether is 20000-60000 viscosity;
Described sodium bentonite fineness≤20%;
Described calcium hydroxide, content >=60% of its CaO+MgO, specific area >=400m2/Kg;
(2) with sand, dry powder and mortar stirring system relevant device is cleaned one time, guarantee free from admixture, Bu NengyouCement;
(3) above-mentioned various raw material stoving to moisture content is less than to 1%;
(4) screen cloth that is 5mm by sand by sieve diameter, screens out particle more than 5mm;
(5) prepare special dry-type additive, its step is as follows:
(5.1) various raw material stoving to the moisture content of special dry powder additive is less than to 1%;
(5.2) take respectively methyl cellulose ether and Escin by formula, adopt agravic formula stirring sideFormula stirs and obtains the first mixture;
(5.3) take naphthalene water reducer by formula, mix in the first mixture that step (5.2) obtains,Adopt agravic formula agitating mode to stir and obtain the second mixture;
(5.4) take respectively sodium bentonite and calcium hydroxide by formula, adopt agravic formula agitating mode to stirMix and evenly obtain the 3rd mixture;
(5.5) it is the 3rd mixed that the second mixture step (5.3) being obtained mixes that step (5.4) obtainsIn compound, adopt agravic formula agitating mode to stir and obtain 4 mixture;
(5.6) finally use sealing bag the 4 mixture of step (5.5) gained dress bag, described in obtainingThe special dry-type additive of synchronous grouting;
(6) take respectively calcium-base bentonite, calcium hydroxide, special dry-type additive by formula, adopt nothingThe stirring of gravity type agitating mode obtains first in 10 seconds-15 seconds and stirs the mixture;
(7) then take flyash by formula, what be added into that step (6) obtains first stirs the mixture,Adopting agravic formula agitating mode stirring to obtain second in 10 seconds-15 seconds stirs the mixture;
(8) finally take sand by formula, what be added into that step (7) obtains second stirs the mixture, and adoptsWith agravic formula agitating mode stirring 20 seconds-30 seconds, obtain described dry-type synchronous grouting dedicated mortar.
2. a kind of dry-type synchronization slip casting construction technology according to claim 1, is characterized in that:Described special dry-type additive, wherein the mass ratio of methyl cellulose ether and naphthalene water reducer is1:30-1:35。
3. a kind of dry-type synchronization slip casting construction technology according to claim 1, is characterized in that:The slurries mixing step of described synchronous grouting job site, further comprises the steps:
(1) on the ground of shield synchronization slip casting job site, place the special cylinder of being with metering agitating deviceStorehouse, and connect water power;
(2) be transported to job site with powder material tank handlebar dry-type synchronous grouting dedicated mortar, and be pumped toIn silo;
(3), according to construction stage, soil layer geological condition, choose the slump of synchronous grouting slurries used;
(4) require the slump according to slurries, set initial water amount;
(5) open silo blanking switch and send taps, silo agitating device to start to stir;
(6) open silo pulp switch, slurries are carried out to the slump, the test of pressure bleeding quantity, to determineSlurries quality and water consumption setting value.
4. a kind of dry-type synchronization slip casting construction technology according to claim 3, is characterized in that:Described requires the slump according to slurries, sets initial water amount and refers to: the slurries slump requires120mm-200mm, the 15-18% that water consumption is siccative, the every increase of slump 20mm, by the quality of dry mashPercentage calculation initial water amount setting value increases by 1%.
5. a kind of dry-type synchronization slip casting construction technology according to claim 3, is characterized in that:After described slurry agitation, before construction, need carry out the test of the slump, pressure bleeding quantity to slurries and refer to: whenSlump value and required value difference in ± 20mm, when pressure bleeding quantity < 30ml, sustainable spice; No, regulating capacity setting value meets the demands slurries, can continue spice discharging.
6. a kind of dry-type synchronization slip casting construction technology according to claim 1, is characterized in that:Described slurries automation is delivered to shield machine head step, also further comprises the steps:
(1) start to shield machine head from silo grout outlet, arrange the slurries conveyance conduit of drive;
(2) with tap water, stock line is lubricated;
Pour water from grout outlet end pipeline opening, to shield machine head end pipeline opening water outlet 5min, stop pouring water;
(3) respectively pipe ends mouth is connected to silo grout outlet, shield machine grouting equipment;
(4) open pipeline pumping propulsion plant, mortar is transported to the shield machine head under active well, for executingWork is used.
7. a kind of dry-type synchronization slip casting construction technology according to claim 6, is characterized in that:Described starts to shield machine head from silo grout outlet, arranges the slurries conveyance conduit of drive, specifically wantsAsk as follows:
Silo grout outlet, to active well ground segment, arranges horizontal pipe, and pipeline initial end need settle pumping to push awayMotion device, promotes power and determines according to the distance of grout outlet and active well; Active well ground is to underground section,Vertical pipe or tilted tube are set, if vertical pipe is set, the every 30 meters of need of the underground degree of depth arrange one section of waterFlat pipeline;
Active well ground, down to shield machine head section, arranges horizontal pipe along tunnel trend, at the beginning of active well is undergroundPumping propulsion plant need be settled in top, promotes power and determines according to the distance of active well and shield machine head.
CN201310283260.XA 2013-07-08 2013-07-08 A kind of dry-type synchronization slip casting construction technology Active CN103362522B (en)

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Publication number Priority date Publication date Assignee Title
CN107151122A (en) * 2017-05-25 2017-09-12 上海隧道工程有限公司 Dry powder and mortar mixing method for shield grouting
CN107939630A (en) * 2017-12-14 2018-04-20 中交第二公路勘察设计研究院有限公司 One kind pumping bentonitic device of particle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0631538B2 (en) * 1988-02-08 1994-04-27 鹿島建設株式会社 Stabilizer used for shield method
CN101737064A (en) * 2008-11-20 2010-06-16 中铁十六局集团有限公司 Shield synchronous grouting serous fluid
CN102758641A (en) * 2012-08-01 2012-10-31 上海城建(集团)公司 Construction method for ultralarge-diameter shield synchronous grouting
CN103102129A (en) * 2013-02-25 2013-05-15 黑龙江省交通科学研究所 Air entrained concrete

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0631538B2 (en) * 1988-02-08 1994-04-27 鹿島建設株式会社 Stabilizer used for shield method
CN101737064A (en) * 2008-11-20 2010-06-16 中铁十六局集团有限公司 Shield synchronous grouting serous fluid
CN102758641A (en) * 2012-08-01 2012-10-31 上海城建(集团)公司 Construction method for ultralarge-diameter shield synchronous grouting
CN103102129A (en) * 2013-02-25 2013-05-15 黑龙江省交通科学研究所 Air entrained concrete

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