CN104534167B - The drag reduction method of thixotropic slurry - Google Patents
The drag reduction method of thixotropic slurry Download PDFInfo
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- CN104534167B CN104534167B CN201410741416.9A CN201410741416A CN104534167B CN 104534167 B CN104534167 B CN 104534167B CN 201410741416 A CN201410741416 A CN 201410741416A CN 104534167 B CN104534167 B CN 104534167B
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- grouting
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- thixotropic slurry
- drag reduction
- injected hole
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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
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- 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 present invention discloses the drag reduction method of a kind of thixotropic slurry, belongs to technical field of civil engineering.First the method prepares the thixotropic slurry of drag reduction, and this thixotropic slurry is made up of sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and appropriate admixture；The thixotropic slurry being stirred is put in slurry can, arranges injected hole and connect grouting pipe, then carrying out grouting pressure calculating, selecting grouting pump, finally carry out slip casting.The inventive method reduces the frictional resistance of tubing and soil by grouting process, use grouting process lubrication, apex distance can be made after drag reduction to improve 40% 70%, the resistance in push pipe work can be effectively reduced, the push pipe that can make heavy caliber distance constantly extends, the inventive method has low cost, technology is easily implemented, and drag reduction efficiency is high.
Description
Technical field:
The invention belongs to technical field of civil engineering, be specifically related to the drag reduction method of a kind of thixotropic slurry, the method be applied to push pipe,
In the construction of the trenchless engineering such as open caisson, boring, realize Gu Bi, lubrication, to reduce the soil body by injecting thixotropic slurry
Frictional resistance, improves work efficiency.
Background technology:
Along with the continuous propelling of China's Urbanization Construction process, no-excavation construction method is applied to city integrated the most more and more widely
In the middle of the construction projects such as pipe network push pipe, open caisson, boring, owing to the frictional resistance by the soil body is affected, constrain to a certain extent
Speed of application, even causes construction to cannot be carried out down.How to reduce the frictional resistance of the soil body, improve trenchless engineering construction work
Effect, becomes for the important technical barrier of this technical field.
Affecting work efficiency problem because of the frictional resistance of the soil body for solving trenchless engineering, vast engineers and technicians pass through year in year out
Technical research and practice of innovation, slip casing by pressure technology creates, and many thixotropic slurry material mixture ratios are also born, thixotropic slurry
Drag reduction method is thus arisen at the historic moment.
In the trenchless engineering constructions such as push pipe, open caisson, boring, the drag reduction method mechanism of thixotropic slurry primarily serves the purpose of: one is
Playing the effect of the supporting & stablizing soil body, two has been the effect of lubrication drag reduction.The trenchless engineering construction got up as a kind of new development is auxiliary
Helping technology, its outstanding support is approved by vast unit in charge of construction the most more and more with drag-reduction effect and promotes the use of, and has wide
Development prospect.
Summary of the invention:
The present invention is directed to the technical problem that thixotropic slurry resistance present in existing jacking construction is bigger, it is provided that a kind of thixotropic slurry
Drag reduction method, the method specifically comprises the following steps that
(1) preparation drag reduction thixotropic slurry:
Thixotropic slurry is made up of sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and appropriate admixture, described tactile
Become the mud mass percent that respectively forms into sodium bentonite 10～20%, carboxymethyl cellulose 0.3～0.5%, sodium carbonate 0.2～
0.4%, clean water and appropriate admixture 80～90%；Dispensing is carried out, so according to the composition mass percent of described thixotropic slurry
The described thixotropic slurry being stirred is put into standing 12h～24h in slurry can by rear employing blender after being stirred；Prepared
Drag reduction thixotropic slurry main performance be: density 1.1～1.17g/cm3, viscosity 30～80s, gel strength 80～120Pa, loses
Water yield ＜ 25cm3/ 30min, pH value ＜ 10.
(2) arrange injected hole and connect grouting pipe:
Push-bench afterbody, by the concrete tube coupling of jacking on reserved 3～5 injected holes, described injected hole is distributed evenly in
Pipeline, described injected hole has degassing function, and each injected hole is respectively provided with faucet control valves door, prevents serosity reflux,
Each injected hole is provided with check valve；Grouting pipe is made up of with supervisor arm, described arm and the faucet control valves of each injected hole
After door connects, then receiving on supervisor, described supervisor connects on grouting pump, and one end of described grouting pump is connected on slurry can.
(3) grouting pressure calculates:
Grouting pressure P can be by formula PA≤P≤PA+ 30kPa calculates, in formula:
When power arch is unloaded in existence:
PAThe water pressure at mud sleeve top and active earth pressure (kPa)；
Density (the kN/m of γ soil3)；
γWForce density (the kN/m of water3)；
The external diameter (m) of D pipeline；
The thickness (m) of the above overlying soil in H pipeline top；
The internal friction angle of soil layer residing for pipeline；
h0Unload the height (m) of power arch；
H1Soil face or power of unloading encircle above water-column (m)；
The cohesiveness (kPa) of C soil.
(4) grouting pump is selected: grouting pump selects the screw pump that pulsation is little, and flow matches with move speed.
(5) slip casting:
A: when tube coupling jacking, open grouting pump, implement synchronous grouting, it is ensured that when push-bench forward time, shape after push-bench
The space become is immediately by described thixotropic slurry filling, thus forms complete mud sleeve.
B: in jack-in process, answers certain interval of time to be tracked mending slurry, and supplementary part is lost to the serosity in soil layer.
C: grouting amount should control 2 times for pipeline outer wall theory voidage, grouting pressure outline launching stress above Ground, control
System is between 0.02MPa～0.15MPa, and along with push pipe distance increase, pressure also must increase therewith, the Stress control of grouting pump
20～50kPa.
D: after jacking terminates, uses cement mortar to mix proper amount of pulverized fuel ash slurry and replaces the serosity of mud sleeve, wait to press
Slurry removes grouting pipeline after condensing, and changes boring cover by injected hole closure.
The thixotropic slurry main material of drag reduction is bentonite and water.After bentonite mixes with water, owing to water is mixed in people's bentonite,
Bentonite swollen weight in water can reach 600% the 700% of bentonite origin weight.Agitated storage is solidifying shape, outside having
In flow regime under power effect, this material note is clipped between pipe shell and soil, can be substantially reduced the frictional resistance that tube coupling advances.
Time static, mud has good stability.For making swelling serosity have good performance, pulping process to add some auxiliary in right amount
Raw material: such as soda, cellulose CMC, retarder etc..Bentonite is divided into again calcium-base bentonite and sodium bentonite, absorbs calcium
Ion many for calcio, absorb sodium ion many for sodium bentonite, select different formula according to different soil properties.By executing
Work is summed up and is found: in sand soil, sodium bentonite drag-reduction effect is more apparent.
The inventive method reduces the frictional resistance of tubing and soil by grouting process.Can after using grouting process lubrication, drag reduction
So that apex distance improves 40% one 70%.The resistance in push pipe work can be effectively reduced, the push pipe of heavy caliber distance can be made not
Breaking and extend, and low cost, technology are easily implemented, drag reduction efficiency is high.
Detailed description of the invention:
The present invention provides the drag reduction method of a kind of thixotropic slurry, and it is as follows that the method is embodied as step:
(1) thixotropic slurry of preparation drag reduction:
Thixotropic slurry is by sodium bentonite, carboxymethyl cellulose (CMC), sodium carbonate (Na2CO3), clean water and mixing in right amount
Mixture form, 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%；Composition quality hundred according to described thixotropic slurry
Proportion by subtraction carries out dispensing, is put in slurry can by the described thixotropic slurry being stirred and stand after then using blender to be stirred
12h～24h, makes bentonite clay particle fully absorb water, expand into colloid；The drag reduction thixotropic slurry main performance prepared is:
Density 1.1～1.17g/cm3, viscosity 30～80s (measuring with funnel viscometer), gel strength 80～120Pa, fluid loss ＜
25cm3/ 30min, pH value ＜ 10.
(2) arrange injected hole and connect grouting pipe:
Push-bench afterbody, by the concrete tube coupling of jacking on reserved 3～5 injected holes, described injected hole is distributed evenly in
Pipeline, described injected hole has degassing function, and each injected hole is respectively provided with faucet control valves door, prevents serosity reflux,
Each injected hole is provided with check valve, makes the mud outside pipe can not pour in down a chimney and block injected hole, thus affect slip casting effect；Slip casting
Pipeline is made up of with supervisor arm, and arm diameter selects the rubber tube of 25～30mm, supervisor's selection a diameter of 40～the steel of 50mm
Pipe, after described arm is connected with the faucet control valves door of each injected hole, then receives on supervisor, and described supervisor connects on grouting pump,
One end of described grouting pump is connected on slurry can.
(3) grouting pressure calculates
Grouting pressure P can be by formula PA≤P≤PA+ 30kPa calculates, in formula:
When power arch is unloaded in existence:
PAThe water pressure at mud sleeve top and active earth pressure (kPa)；
Density (the kN/m of γ soil3)；
γWForce density (the kN/m of water3)；
The external diameter (m) of D pipeline；
The thickness (m) of the above overlying soil in H pipeline top；
The internal friction angle of soil layer residing for pipeline；
h0Unload the height (m) of power arch；
H1Soil face or power of unloading encircle above water-column (m)；
The cohesiveness (kPa) of C soil.
(4) grouting pump is selected: grouting pump selects the screw pump that pulsation is little, and flow matches with move speed.
(5) slip casting:
The thixotropic slurry stirred should can start perfusion after static certain time (12～24h)；Before slip casting, reply note
Equipment, pipeline etc. check, confirm that device systems can start perfusion after working properly；Grouting mode based on synchronous grouting,
It is auxiliary for mending slurry, in jack-in process, needs to check the serosity formational situation of each propelling section.
A: when tube coupling jacking, open grouting pump, implement synchronous grouting, it is ensured that when push-bench forward time, shape after push-bench
The space become is immediately by described thixotropic slurry filling, thus forms complete mud sleeve；
B: in jack-in process, answers certain interval of time to be tracked mending slurry, and supplementary part is lost to the serosity in soil layer；
C: grouting amount should control 2 times for pipeline outer wall theory voidage, grouting pressure outline launching stress above Ground, control
System is between 0.02MPa～0.15MPa, and along with push pipe distance increase, pressure also must increase therewith, the Stress control of grouting pump
20～50kPa；
D: after jacking terminates, uses cement mortar to mix proper amount of pulverized fuel ash slurry and replaces the serosity of mud sleeve, wait to press
After slurry condenses, (typically more than 24 hours) can remove grouting pipeline, and changes boring cover by injected hole closure.
Claims (1)
1. the drag reduction method of thixotropic slurry, it is characterised in that the method specifically comprises the following steps that
(1) preparation drag reduction thixotropic slurry:
Thixotropic slurry is made up of sodium bentonite, carboxymethyl cellulose, sodium carbonate, clean water and appropriate admixture, described tactile
Become the mud mass percent that respectively forms into sodium bentonite 10～20%, carboxymethyl cellulose 0.3～0.5%, sodium carbonate 0.2～
0.4%, clean water and appropriate admixture 80～90%；Dispensing is carried out, then according to the composition mass percent of described thixotropic slurry
After using blender to be stirred, the described thixotropic slurry being stirred is put into standing 12h～24h in slurry can；Prepared
Drag reduction thixotropic slurry main performance is: density 1.1～1.17g/cm3, viscosity 30～80s, gel strength 80～120Pa, dehydration
Amount ＜ 25cm3/ 30min, pH value ＜ 10；
(2) arrange injected hole and connect grouting pipe:
Push-bench afterbody, by the concrete tube coupling of jacking on reserved 3～5 injected holes, described injected hole is distributed evenly in pipe
Around road, described injected hole has degassing function, and each injected hole is respectively provided with faucet control valves door, prevents serosity reflux, often
Individual injected hole is provided with check valve；Grouting pipe is made up of with supervisor arm, described arm and the faucet control valves door of each injected hole
After connection, then receiving on supervisor, described supervisor connects on grouting pump, and one end of described grouting pump is connected on slurry can；
(3) grouting pressure calculates:
Grouting pressure P can be by formula PA≤P≤PA+ 30kPa calculates, in formula:
When power arch is unloaded in existence: PA=γWH1+γ●h0；
PAThe water pressure at mud sleeve top and active earth pressure (kPa)；
Density (the kN/m of γ soil3)；
γWForce density (the kN/m of water3)；
The external diameter (m) of D pipeline；
The thickness (m) of the above overlying soil in H pipeline top；
The internal friction angle of soil layer residing for pipeline；
h0Unload the height (m) of power arch；
H1Soil face or power of unloading encircle above water-column (m)；
The cohesiveness (kPa) of C soil；
(4) grouting pump is selected: grouting pump selects the screw pump that pulsation is little, and flow matches with move speed；
(5) slip casting:
A: when tube coupling jacking, open grouting pump, implement synchronous grouting, it is ensured that when push-bench forward time, after push-bench formed
Space immediately by described thixotropic slurry filling, thus form complete mud sleeve；
B: in jack-in process, answers certain interval of time to be tracked mending slurry, and supplementary part is lost to the serosity in soil layer；
C: grouting amount should control 2 times for pipeline outer wall theory voidage, grouting pressure outline launching stress above Ground, controls
Between 0.02MPa～0.15MPa, along with push pipe distance increase, pressure also must increase therewith, and the Stress control of grouting pump exists
20～50kPa；
D: after jacking terminates, uses cement mortar to mix proper amount of pulverized fuel ash slurry and replaces the serosity of mud sleeve, treat mud jacking
Body removes grouting pipeline after condensing, and changes boring cover by injected hole closure.
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| CN201410741416.9A CN104534167B (en) | 2014-12-08 | 2014-12-08 | The drag reduction method of thixotropic slurry |
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| CN201410741416.9A CN104534167B (en) | 2014-12-08 | 2014-12-08 | The drag reduction method of thixotropic slurry |
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| CN203685205U (en) * | 2013-12-26 | 2014-07-02 | 中铁工程装备集团有限公司 | Thixotropic mud injection device with replaceable one-way valve |
| CN104150822B (en) * | 2014-07-22 | 2016-01-20 | 中铁隧道集团有限公司 | Thixotropic slurry and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108843328A (en) * | 2018-06-25 | 2018-11-20 | 佳琳 | A kind of Metro Connection Passage excavation construction support construction method |
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