CN104534167A - Drag reduction method of thixotropic slurry - Google Patents

Drag reduction method of thixotropic slurry Download PDF

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Publication number
CN104534167A
CN104534167A CN201410741416.9A CN201410741416A CN104534167A CN 104534167 A CN104534167 A CN 104534167A CN 201410741416 A CN201410741416 A CN 201410741416A CN 104534167 A CN104534167 A CN 104534167A
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Prior art keywords
grouting
slurry
thixotropic slurry
drag reduction
pipeline
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CN201410741416.9A
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CN104534167B (en
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黄忠
周如明
黄超
肖来兵
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China MCC17 Group Co Ltd
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China MCC17 Group Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
    • F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention discloses a drag reduction method of thixotropic slurry, and belongs to the technical field of civil engineering. The method includes the steps: firstly, preparing the thixotropic slurry for drag reduction; secondly, placing stirred thixotropic slurry into a slurry storage tank, forming a grouting hole and connecting a grouting pipeline; thirdly, calculating grouting pressure and selecting a grouting pump; finally, performing grouting. The thixotropic slurry comprises sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and an appropriate amount of admixture. Frictional drag of a pipe and soil is decreased by a grouting process, the vertex distance can be increased by 40%-70% after lubrication and drag reduction by the grouting process, drag of a top pipe in work can be effectively reduced, the top pipe with a large caliber and a long distance can continuously extend, and the drag reduction method has the advantages of low cost, easiness in technical implementation and high drag reduction efficiency.

Description

The drag reduction method of thixotropic slurry
Technical field
The invention belongs to technical field of civil engineering, be specifically related to a kind of drag reduction method of thixotropic slurry, the method is applied in the trenchless engineering constructions such as push pipe, open caisson, boring, realizes Gu Bi, lubrication by injecting thixotropic slurry, to reduce the surface friction drag of the soil body, improve work efficiency.
Background technique
Along with the continuous propelling of China's Urbanization Construction process, no-excavation construction method is applied in the middle of the construction projects such as city integrated pipe network push pipe, open caisson, boring just more and more widely, owing to being subject to the surface friction drag impact of the soil body, constrain speed of application to a certain extent, even cause construction to go on.How to reduce the surface friction drag of the soil body, improve trenchless engineering construction efficiency, just become the technical barrier that this technical field is important.
Work efficiency problem is affected because of the surface friction drag of the soil body for solving trenchless engineering, vast engineers and technicians are by technical research year in year out and practice of innovation, slip casing by pressure technology creates, and many thixotropic slurry material mixture ratios have also been born, and the drag reduction method of thixotropic slurry has been arisen at the historic moment thus.
In the construction of the trenchless engineering such as push pipe, open caisson, boring, the drag reduction method mechanism Main Function of thixotropic slurry is: one has been the effect of the supporting & stablizing soil body, and two has been effects of lubrication drag reduction.As the trenchless engineering construction ancillary technique that a kind of new development is got up, its outstanding support and drag-reduction effect are approved by vast unit in charge of construction more and more and are promoted the use of, and have vast potential for future development.
Summary of the invention
The present invention is directed to the technical problem that the thixotropic slurry resistance that exists in existing jacking construction is larger, provide a kind of drag reduction method of thixotropic slurry, the method concrete steps are as follows:
1, the drag reduction method of thixotropic slurry, is characterized in that the method concrete steps are as follows:
(1) drag reduction thixotropic slurry is prepared:
Thixotropic slurry is made up of sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and appropriate admixture, the mass percent that described thixotropic slurry respectively forms is: sodium bentonite 10 ~ 20%, carboxymethyl cellulose 0.3 ~ 0.5%, sodium carbonate 0.2 ~ 0.4%, clean water and appropriate admixture 80 ~ 90%; Prepare burden according to the composition mass percent of described thixotropic slurry, after then adopting stirrer to stir, the described thixotropic slurry be stirred is put into slurry can and leave standstill 12h ~ 24h; The drag reduction thixotropic slurry main performance prepared be: density 1.1 ~ 1.17g/cm 3, viscosity 30 ~ 80s, gel strength 80 ~ 120Pa, fluid loss < 25cm 3/ 30min, pH value < 10.
(2) arrange injected hole and connect grouting pipe:
At push-bench afterbody, by 3 ~ 5 injected holes reserved on the concrete tube coupling of jacking, described injected hole is distributed in pipeline equably, and described injected hole has degassing function, and each injected hole all arranges faucet control valves door, prevent slurries reflux, in each injected hole, be provided with one-way valve; Grouting pipe is made up of arm and supervisor, after described arm is connected with the faucet control valves door of each injected hole, then receives on supervisor, and described supervisor connects on mudjack, and one end of described grouting pump is connected on slurry can.
(3) grouting pressure calculates:
Grouting pressure P can by formula P a≤ P≤P a+ 30kPa calculates, in formula:
When power arch is unloaded in existence: P a=γ wh 1+ γ h 0;
P a---the water pressure at mud sleeve top and active earth pressure (kPa);
γ---the density (kN/m of soil 3);
γ w---the force density (kN/m of water 3);
The external diameter (m) of D---pipeline;
H---the thickness (m) of the above overlying soil in pipeline top;
---the angle of internal friction of soil layer residing for pipeline;
H 0---unload the height (m) of power arch;
H 1---native face or the power of unloading encircle above water-column (m);
C---the cohesive force (kPa) of soil.
(4) select grouting pump: the screw pump that grouting pump selects pulsation little, flow and move speed match.
(5) slip casting:
A: when tube coupling jacking, open mudjack, implement synchronous grouting, guarantee when push-bench forward time, the space formed after push-bench immediately by described thixotropic slurry filling, thus forms complete mud sleeve.
B: in jack-in process, answer certain interval of time to carry out tracking and mend slurry, supplementary portion divides the slurries be lost in soil layer.
C: grouting amount should control 2 times into the theoretical void volume of pipeline outer wall, grouting pressure outline launching stress above Ground, control between 0.02MPa ~ 0.15MPa, along with the increase of push pipe distance, pressure also must increase thereupon, and the Stress control of mudjack is at 20 ~ 50kPa.
D: after jacking terminates, adopts the appropriate slurries of pulverized fuel ash slurry to mud sleeve of slush fusion to replace, removes grouting pipeline, and change stifle by injected hole shutoff after the condensation of mud jacking body.
The thixotropic slurry main material of drag reduction is bentonite clay and water.After bentonite clay mixes with water, because water is mixed in people's bentonite clay, bentonite clay swollen weight in water can reach 600%-700% of bentonite origin weight.Storing in solidifying shape through stirring, having in flowing state under External Force Acting, this material note is clipped between pipe shell and soil, greatly can reduce the frictional resistance that tube coupling advances.Time static, mud has good stability.For making swelling slurries have good performance, some auxiliary materials to be added in right amount in pulping process: as soda ash, cellulose CMC, retarding agent etc.Bentonite clay is divided into again calcium-base bentonite and sodium bentonite, and what absorption calcium ion was many is calcium base, and what absorption sodium ion was many is sodium bentonite, selects different formulas according to different soil properties.Found by construction summarize: in sand soil, sodium bentonite drag-reduction effect is more obvious.
The inventive method reduces the surface friction drag of tubing and soil by grouting process.Adopt grouting process lubrication, apex distance can be made after drag reduction to improve 40% one 70%.Effectively can reduce the resistance in push pipe work, the push pipe of the long distance of heavy caliber can be made constantly to extend, and cost is low, technology is easily implemented, drag reduction efficiency is high.
Embodiment
The invention provides a kind of drag reduction method of thixotropic slurry, the concrete implementation step of the method is as follows:
(1) thixotropic slurry of drag reduction is prepared:
Thixotropic slurry is by sodium bentonite, carboxymethyl cellulose (CMC), sodium carbonate (Na 2cO 3), clean water and appropriate admixture composition, the mass percent that described thixotropic slurry respectively forms is: sodium bentonite 10 ~ 20%, carboxymethyl cellulose 0.3 ~ 0.5%, sodium carbonate 0.2 ~ 0.4%, clean water and appropriate admixture 80 ~ 90%; Prepare burden according to the composition mass percent of described thixotropic slurry, after then adopting stirrer to stir, the described thixotropic slurry be stirred is put into slurry can and leave standstill 12h ~ 24h, bentonite clay particle is fully absorbed water, expand into colloid; The drag reduction thixotropic slurry main performance prepared be: density 1.1 ~ 1.17g/cm 3, viscosity 30 ~ 80s (measuring with funnel viscometer), gel strength 80 ~ 120Pa, fluid loss < 25cm 3/ 30min, pH value < 10.
(2) arrange injected hole and connect grouting pipe:
At push-bench afterbody, by 3 ~ 5 injected holes reserved on the concrete tube coupling of jacking, described injected hole is distributed in pipeline equably, described injected hole has degassing function, each injected hole all arranges faucet control valves door, prevent slurries reflux, in each injected hole, be provided with one-way valve, make the mud outside pipe can not pour in down a chimney and block injected hole, thus affect slip casting effect; Grouting pipe is made up of arm and supervisor, arm diameter selects the rubber pipe of 25 ~ 30mm, supervisor selects diameter to be the steel pipe of 40 ~ 50mm, after described arm is connected with the faucet control valves door of each injected hole, receive again on supervisor, described supervisor connects on mudjack, and one end of described grouting pump is connected on slurry can.
(3) grouting pressure calculates
Grouting pressure P can by formula P a≤ P≤P a+ 30kPa calculates, in formula:
When power arch is unloaded in existence: P a=γ wh 1+ γ h 0;
P a---the water pressure at mud sleeve top and active earth pressure (kPa);
γ---the density (kN/m of soil 3);
γ w---the force density (kN/m of water 3);
The external diameter (m) of D---pipeline;
H---the thickness (m) of the above overlying soil in pipeline top;
---the angle of internal friction of soil layer residing for pipeline;
H 0---unload the height (m) of power arch;
H 1---native face or the power of unloading encircle above water-column (m);
C---the cohesive force (kPa) of soil.
(4) select grouting pump: the screw pump that grouting pump selects pulsation little, flow and move speed match.
(5) slip casting:
After the thixotropic slurry stirred answers static certain hour (12 ~ 24h), perfusion can be started; Before slip casting, reply note equipment, pipeline etc. check, confirm that device systems can start perfusion after working properly; Grouting mode is based on synchronous grouting, and it is auxiliary for mending slurry, in jack-in process, needs the slurries formational situation checking each propelling section.
A: when tube coupling jacking, open mudjack, implement synchronous grouting, guarantee when push-bench forward time, the space formed after push-bench immediately by described thixotropic slurry filling, thus forms complete mud sleeve;
B: in jack-in process, answer certain interval of time to carry out tracking and mend slurry, supplementary portion divides the slurries be lost in soil layer;
C: grouting amount should control 2 times into the theoretical void volume of pipeline outer wall, grouting pressure outline launching stress above Ground, control between 0.02MPa ~ 0.15MPa, along with the increase of push pipe distance, pressure also must increase thereupon, and the Stress control of mudjack is at 20 ~ 50kPa;
D: after jacking terminates, adopts the appropriate slurries of pulverized fuel ash slurry to mud sleeve of slush fusion to replace, after the condensation of mud jacking body (generally more than 24 hours) can grouting pipeline be removed, and change stifle by injected hole shutoff.

Claims (1)

1. the drag reduction method of thixotropic slurry, is characterized in that the method concrete steps are as follows:
(1) drag reduction thixotropic slurry is prepared:
Thixotropic slurry is made up of sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and appropriate admixture, the mass percent that described thixotropic slurry respectively forms is: sodium bentonite 10 ~ 20%, carboxymethyl cellulose 0.3 ~ 0.5%, sodium carbonate 0.2 ~ 0.4%, clean water and appropriate admixture 80 ~ 90%; Prepare burden according to the composition mass percent of described thixotropic slurry, after then adopting stirrer to stir, the described thixotropic slurry be stirred is put into slurry can and leave standstill 12h ~ 24h; The drag reduction thixotropic slurry main performance prepared be: density 1.1 ~ 1.17g/cm 3, viscosity 30 ~ 80s, gel strength 80 ~ 120Pa, fluid loss < 25cm 3/ 30min, pH value < 10;
(2) arrange injected hole and connect grouting pipe:
At push-bench afterbody, by 3 ~ 5 injected holes reserved on the concrete tube coupling of jacking, described injected hole is distributed in pipeline equably, and described injected hole has degassing function, and each injected hole all arranges faucet control valves door, prevent slurries reflux, in each injected hole, be provided with one-way valve; Grouting pipe is made up of arm and supervisor, after described arm is connected with the faucet control valves door of each injected hole, then receives on supervisor, and described supervisor connects on mudjack, and one end of described grouting pump is connected on slurry can;
(3) grouting pressure calculates:
Grouting pressure P can by formula P a≤ P≤P a+ 30kPa calculates, in formula:
When power arch is unloaded in existence: P a=γ wh 1+ γ h 0;
P a---the water pressure at mud sleeve top and active earth pressure (kPa);
γ---the density (kN/m of soil 3);
γ w---the force density (kN/m of water 3);
The external diameter (m) of D---pipeline;
H---the thickness (m) of the above overlying soil in pipeline top;
---the angle of internal friction of soil layer residing for pipeline;
H 0---unload the height (m) of power arch;
H 1---native face or the power of unloading encircle above water-column (m);
C---the cohesive force (kPa) of soil;
(4) select grouting pump: the screw pump that grouting pump selects pulsation little, flow and move speed match;
(5) slip casting:
A: when tube coupling jacking, open mudjack, implement synchronous grouting, guarantee when push-bench forward time, the space formed after push-bench immediately by described thixotropic slurry filling, thus forms complete mud sleeve;
B: in jack-in process, answer certain interval of time to carry out tracking and mend slurry, supplementary portion divides the slurries be lost in soil layer;
C: grouting amount should control 2 times into the theoretical void volume of pipeline outer wall, grouting pressure outline launching stress above Ground, control between 0.02MPa ~ 0.15MPa, along with the increase of push pipe distance, pressure also must increase thereupon, and the Stress control of mudjack is at 20 ~ 50kPa;
D: after jacking terminates, adopts the appropriate slurries of pulverized fuel ash slurry to mud sleeve of slush fusion to replace, removes grouting pipeline, and change stifle by injected hole shutoff after the condensation of mud jacking body.
CN201410741416.9A 2014-12-08 2014-12-08 The drag reduction method of thixotropic slurry Active CN104534167B (en)

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Cited By (19)

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CN104844129A (en) * 2015-04-28 2015-08-19 广东华恒建设工程有限公司 Modified thixotropic slurry and preparation method thereof
CN105154205A (en) * 2015-08-31 2015-12-16 江苏锐成机械有限公司 Lubricating material for pipe jacking construction
CN105781589A (en) * 2016-05-14 2016-07-20 中铁四局集团有限公司 Novel grouting process applicable to pipe jacking construction of desert region
CN105782564A (en) * 2016-05-05 2016-07-20 江西建工第三建筑有限责任公司 Physical touch resistance reducing method of top pipe mud
CN106007637A (en) * 2016-05-13 2016-10-12 中煤第三建设（集团）有限责任公司广州分公司 Plasticizer injected to rear portion of pipe joint wall of jacking pipe
CN108395172A (en) * 2018-03-14 2018-08-14 中南大学 One kind passing through the complete slurry wall of lakebed goaf extra long distance Large-diameter Steel push pipe
CN108487097A (en) * 2018-04-09 2018-09-04 大连久鼎祥瑞特种工程技术研究院有限公司 Horizontal seepage well or pipeline push pipe rapid constructing method
CN108531151A (en) * 2018-04-26 2018-09-14 中铁隧道集团二处有限公司 Push-bench anti-drag mud and preparation method thereof in one planting sand soil property
CN108547308A (en) * 2018-05-04 2018-09-18 中国建筑第四工程局有限公司 A kind of mud sleeve auxiliary Double-Wall Steel Boxed Cofferdam sinking construction method
CN108843328A (en) * 2018-06-25 2018-11-20 佳琳 A kind of Metro Connection Passage excavation construction support construction method
CN110185844A (en) * 2019-06-05 2019-08-30 中交一公局第三工程有限公司 Shallow earthing pipe-jacking with large diameter construction method
CN110864162A (en) * 2019-11-05 2020-03-06 国网浙江省电力有限公司宁波市镇海区供电公司 Construction process of argillaceous sandstone geological pipe jacking
CN111302710A (en) * 2020-03-03 2020-06-19 中国五冶集团有限公司 Large-diameter overlong punching slurry in dense pebble bed area
CN111691889A (en) * 2020-05-15 2020-09-22 中电建十一局工程有限公司 Pipe jacking engineering construction method
CN112901178A (en) * 2021-01-18 2021-06-04 中铁上海工程局集团第五工程有限公司 Thixotropic slurry anti-drag grouting system and grouting method for medium-long distance oversized-diameter jacking pipe
CN112960942A (en) * 2021-02-02 2021-06-15 中铁四局集团第三建设有限公司 Thixotropic slurry for earth pressure balance jacking pipe in anhydrous sand layer, preparation method thereof, grouting method and slurry replacement method
US11095102B2 (en) 2016-09-06 2021-08-17 Quanta Associates, L.P. Repurposing pipeline for electrical cable
CN113389563A (en) * 2021-08-04 2021-09-14 郑州亚欧交通职业学院 Subway tunnel construction push pipe pipeline thixotropic slurry device
CN113531207A (en) * 2020-04-17 2021-10-22 中建三局安装工程有限公司 Anti-drag and stone chip blocking grouting method suitable for long-distance rock pipe jacking engineering

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CN104844129B (en) * 2015-04-28 2016-01-13 广东华恒建设工程有限公司 A kind of modification thixotropic slurry and compound method thereof
CN104844129A (en) * 2015-04-28 2015-08-19 广东华恒建设工程有限公司 Modified thixotropic slurry and preparation method thereof
CN105154205A (en) * 2015-08-31 2015-12-16 江苏锐成机械有限公司 Lubricating material for pipe jacking construction
CN105782564A (en) * 2016-05-05 2016-07-20 江西建工第三建筑有限责任公司 Physical touch resistance reducing method of top pipe mud
CN106007637A (en) * 2016-05-13 2016-10-12 中煤第三建设（集团）有限责任公司广州分公司 Plasticizer injected to rear portion of pipe joint wall of jacking pipe
CN105781589A (en) * 2016-05-14 2016-07-20 中铁四局集团有限公司 Novel grouting process applicable to pipe jacking construction of desert region
US11095102B2 (en) 2016-09-06 2021-08-17 Quanta Associates, L.P. Repurposing pipeline for electrical cable
US11095101B2 (en) 2016-09-06 2021-08-17 Quanta Associates, L.P. Repurposing pipeline for electrical cable
CN108395172A (en) * 2018-03-14 2018-08-14 中南大学 One kind passing through the complete slurry wall of lakebed goaf extra long distance Large-diameter Steel push pipe
CN108395172B (en) * 2018-03-14 2020-10-02 中南大学 Complete wall protection slurry for super-long-distance large-diameter steel roof pipe penetrating through lake bottom goaf
CN108487097A (en) * 2018-04-09 2018-09-04 大连久鼎祥瑞特种工程技术研究院有限公司 Horizontal seepage well or pipeline push pipe rapid constructing method
CN108531151A (en) * 2018-04-26 2018-09-14 中铁隧道集团二处有限公司 Push-bench anti-drag mud and preparation method thereof in one planting sand soil property
CN108547308A (en) * 2018-05-04 2018-09-18 中国建筑第四工程局有限公司 A kind of mud sleeve auxiliary Double-Wall Steel Boxed Cofferdam sinking construction method
CN108843328A (en) * 2018-06-25 2018-11-20 佳琳 A kind of Metro Connection Passage excavation construction support construction method
CN110185844A (en) * 2019-06-05 2019-08-30 中交一公局第三工程有限公司 Shallow earthing pipe-jacking with large diameter construction method
CN110864162A (en) * 2019-11-05 2020-03-06 国网浙江省电力有限公司宁波市镇海区供电公司 Construction process of argillaceous sandstone geological pipe jacking
CN110864162B (en) * 2019-11-05 2021-11-02 国网浙江省电力有限公司宁波市镇海区供电公司 Construction process of argillaceous sandstone geological pipe jacking
CN111302710A (en) * 2020-03-03 2020-06-19 中国五冶集团有限公司 Large-diameter overlong punching slurry in dense pebble bed area
CN113531207A (en) * 2020-04-17 2021-10-22 中建三局安装工程有限公司 Anti-drag and stone chip blocking grouting method suitable for long-distance rock pipe jacking engineering
CN113531207B (en) * 2020-04-17 2023-09-22 中建三局安装工程有限公司 Drag-reducing and stone chip-blocking grouting method suitable for long-distance rock jacking engineering
CN111691889A (en) * 2020-05-15 2020-09-22 中电建十一局工程有限公司 Pipe jacking engineering construction method
CN111691889B (en) * 2020-05-15 2022-04-12 中电建十一局工程有限公司 Pipe jacking engineering construction method
CN112901178A (en) * 2021-01-18 2021-06-04 中铁上海工程局集团第五工程有限公司 Thixotropic slurry anti-drag grouting system and grouting method for medium-long distance oversized-diameter jacking pipe
CN112901178B (en) * 2021-01-18 2023-03-24 中铁上海工程局集团第五工程有限公司 Thixotropic slurry anti-drag grouting system and grouting method for medium-long distance oversized-diameter jacking pipe
CN112960942A (en) * 2021-02-02 2021-06-15 中铁四局集团第三建设有限公司 Thixotropic slurry for earth pressure balance jacking pipe in anhydrous sand layer, preparation method thereof, grouting method and slurry replacement method
CN113389563A (en) * 2021-08-04 2021-09-14 郑州亚欧交通职业学院 Subway tunnel construction push pipe pipeline thixotropic slurry device
CN113389563B (en) * 2021-08-04 2023-04-11 郑州亚欧交通职业学院 Drilling equipment in tunnel push pipe thixotropic mud slip casting hole

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