CN112960942B - Thixotropic slurry for earth pressure balance jacking pipe in anhydrous sand layer, preparation method thereof, grouting method and slurry replacement method - Google Patents
Thixotropic slurry for earth pressure balance jacking pipe in anhydrous sand layer, preparation method thereof, grouting method and slurry replacement method Download PDFInfo
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- 239000002002 slurry Substances 0.000 title claims abstract description 167
- 230000009974 thixotropic effect Effects 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 46
- 239000004576 sand Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 239000002689 soil Substances 0.000 claims abstract description 44
- 239000004568 cement Substances 0.000 claims description 28
- 239000011440 grout Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 46
- 239000000440 bentonite Substances 0.000 abstract description 24
- 229910000278 bentonite Inorganic materials 0.000 abstract description 24
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 24
- 229910001868 water Inorganic materials 0.000 abstract description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 23
- 235000017550 sodium carbonate Nutrition 0.000 abstract description 23
- 238000010276 construction Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 7
- 239000011734 sodium Substances 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 5
- 229940092782 bentonite Drugs 0.000 description 22
- 238000003756 stirring Methods 0.000 description 22
- 230000003068 static effect Effects 0.000 description 8
- 239000004615 ingredient Substances 0.000 description 6
- 239000001768 carboxy methyl cellulose Substances 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
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- 238000006467 substitution reaction Methods 0.000 description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical group [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 125000002057 carboxymethyl group Chemical group [H]OC(=O)C([H])([H])[*] 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 3
- 238000007569 slipcasting Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 230000005641 tunneling Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 2
- 229940106681 chloroacetic acid Drugs 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
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- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 125000002353 D-glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229940080314 sodium bentonite Drugs 0.000 description 1
- 229910000280 sodium bentonite Inorganic materials 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses thixotropic slurry for a soil pressure balance jacking pipe in an anhydrous sand layer, a preparation method, a grouting method and a slurry replacement method thereof, wherein the thixotropic slurry comprises water, bentonite, sodium carbonate (Na 2CO 3) and an admixture which are mixed and stirred; wherein the weight ratio of each component is as follows: water: bentonite: soda ash (Na 2CO 3): admixture = 400-450; the thixotropic slurry can effectively reduce the jacking force required in the jacking process of the jacking pipe, effectively control ground settlement and maintain the stability of soil mass around the pipe; the grouting method and the slurry replacement method can greatly reduce the jacking force during jacking construction in the anhydrous sand layer, effectively control ground settlement and maintain the stability of the soil body around the pipe, and have positive significance for the development of pipe jacking engineering.
Description
Technical Field
The invention belongs to the technical field of pipe jacking construction drag reduction, and particularly relates to thixotropic slurry for a soil pressure balance pipe jacking in an anhydrous sand layer, a preparation method, a grouting method and a slurry replacement method thereof.
Background
With the rapid development of the domestic urbanization process, underground spaces are widely developed and utilized due to the limitation of the above-ground spaces, and underground pipelines, underground passages and the like become important components of complex network systems of modern cities. The construction of urban underground pipe networks and underground traffic lines usually adopts open cut construction and underground construction. Open cut construction usually causes urban road surface destruction, traffic jam to cause various environmental problems such as urban ground environmental pollution and construction noise pollution, cause serious influence to urban resident's daily life. Underground construction is divided into a roadway method, a pipe jacking method, a shield method and the like, wherein the pipe jacking method has the advantages of economy, safety, high efficiency, simplicity and convenience and the like, and is widely applied to development and utilization of urban underground space.
According to different working principles, the push bench is divided into mud water balance, earth pressure balance, air pressure balance, rock push bench and the like. Among various pipe jacking machine types, the soil pressure balance pipe jacking machine has relatively wide adaptability, can be used for various complex strata such as cohesive or non-cohesive, water or non-water, soft soil or soft rock, conglomerate or round gravel and the like, can effectively control ground surface settlement, and is generally applied to jacking construction of sandy soil layers. With the improvement and development of the push bench and the auxiliary function, such as the adoption of a mud adding modifier system, the application of an anti-gushing function system and a pressure-maintaining slag pressing device and the like, the earth pressure balance push bench has complete functions and advanced technical performance, the construction efficiency and the safety are greatly improved, but certain risks and challenges still exist when the earth pressure balance push bench is applied to the jacking construction of sandy soil layers.
When the earth pressure balance pipe jacking method is applied to building underground pipelines and underground passages in sandy soil layers, the soil bodies have the characteristics of small cohesive force, large internal friction angle, poor arching effect, short self-stabilization time, easy formation of small-range collapse of the soil bodies above pipe joints and the like, so that the friction force between the pipe wall and the soil bodies is large in the jacking process of the pipe jacking, the required jacking force is large, the phenomenon of 'soil back' is easy to generate, and the stability of the soil bodies above the pipe joints is difficult to maintain. The thixotropic slurry grouting drag reduction technology has the advantages that the application of the functions of stabilizing and supporting a soil body, preventing collapse, reducing jacking friction resistance and the like in the jacking construction process is very important, the quality of the performance is the key for determining whether the construction can be smoothly carried out, and the requirements of different stratums on the performance and the use of the thixotropic slurry are different. At present, no prior art data of the proportion and the resistance reduction method of the thixotropic slurry for the jacking pipe in the anhydrous sand layer is disclosed, the proportion used for construction is completely determined by experience, and no test data support exists.
Disclosure of Invention
The invention provides thixotropic slurry for a soil pressure balance jacking pipe in an anhydrous sand layer, a preparation method, a grouting method and a slurry replacement method thereof.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention firstly provides thixotropic slurry for a soil pressure balance jacking pipe in an anhydrous sand layer, wherein the thixotropic slurry comprises water, bentonite, sodium carbonate (Na 2CO 3) and an admixture which are mixed and stirred; wherein the weight ratio of each component is as follows: water: bentonite: soda ash (Na 2CO 3): admixture = 400-450.
It is also preferred that the pH of the water is 7 or more. To prevent corrosion of the pipe.
The invention further provides a preparation method of the thixotropic slurry for the soil pressure balance pipe jacking in the anhydrous sand layer, which comprises the following steps,
adding clear water into the stirring barrel;
starting a stirring device in the stirring barrel, adding the bentonite, the soda ash and the admixture during stirring, and enabling the weight ratio of each component to be as follows: water: bentonite: soda ash: admixture = 400-450;
and after the ingredients comprising the bentonite, the soda ash and the admixture are mixed, continuously stirring for a preset time to finish the preparation of the thixotropic slurry.
It is also preferable that after the ingredients including the bentonite, the soda ash and the admixture are mixed, the opening of the stirring barrel is covered with a preservative film, and then the stirring is continued.
The invention provides the grouting method of the thixotropic slurry for the earth pressure balance jacking pipe in the anhydrous sand layer again, which comprises the following steps,
connecting grouting equipment with a grouting pipe;
pouring the thixotropic slurry into the grouting pipe;
pressing the thixotropic slurry in the grouting pipe through the grouting equipment, and then jacking the pressed thixotropic slurry;
the press-in operation and the top-fixing operation are repeated.
It is also preferable that a check valve is installed at the grouting hole at the end of the grouting pipe.
It may also be preferred to set the thixotropic slurry grouting pressure greater than the static earth pressure.
It is also preferable that the static soil pressure is an upper limit of a calculated value of the soil cabin pressure during excavation.
The invention finally provides a slurry replacement method of the thixotropic slurry for the earth pressure balance pipe jacking in the anhydrous sand layer, which comprises the following steps,
grouting and slurry replacement: sequentially injecting cement slurry from one end of the grouting pipe, replacing the thixotropic slurry with the cement slurry, sequentially opening a grouting hole and a slurry discharge hole in the grouting pipe, and performing circulating operation;
in the early stage of replacement grouting, the thixotropic slurry flows out;
along with the progress of displacement grouting and the injection of the cement paste, when the pure cement paste begins to flow out, the slurry discharge hole is closed;
and after the grouting body is condensed, removing the grouting pipe, and plugging the grouting hole by adopting a plug.
Preferably, during grouting and slurry replacement grouting, a grouting pump is started first, a grouting valve is closed, a slurry return valve is opened, after the operation is circulated for a set time, a grouting pipe valve is opened, a slurry discharge valve of a slurry discharge pipe section is opened simultaneously, slurry is sequentially discharged from the bottom upwards, thixotropic slurry is discharged at the early stage, and the discharged slurry is changed into the slurry along with the injection of the slurry; and after the replacement is finished, closing the slurry discharge valve, and after the grouting is carried out for a set time, starting the grouting and slurry replacement operation of the next cycle period.
The invention can achieve the following beneficial effects:
according to the thixotropic slurry for the soil pressure balance jacking pipe in the anhydrous sand layer, the preparation method, the grouting method and the slurry replacement method, the thixotropic slurry can effectively reduce the jacking force required in the jacking process of the jacking pipe, effectively control the ground settlement and maintain the stability of the soil body around the pipe; the grouting method and the slurry replacement method can greatly reduce the jacking force during jacking construction in the anhydrous sand layer, effectively control ground settlement and maintain the stability of the soil body around the pipe, and have positive significance for the development of pipe jacking engineering.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the grouting and grout replacement sequence of the grout replacement method of thixotropic slurry for earth pressure balance jacking pipes in an anhydrous sand layer.
FIG. 2 is another schematic view of the grouting and grout replacement sequence of the grout replacement method for thixotropic slurry for earth pressure balance jacking pipes in an anhydrous sand layer according to the present invention.
In the figure, 1 is a first section of grouting pipe, 2 is a second section of grouting pipe, 3 is a third section of grouting pipe, and 4 is a fourth section of grouting pipe. In fig. 1 and 2, the hollow solid arrows indicate the grouting sequence direction of each grouting pipe, the solid arrows indicate the grouting direction, and the solid dashed arrows indicate the grouting direction.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Thixotropic slurry for a soil pressure balance jacking pipe in an anhydrous sand layer, wherein the thixotropic slurry comprises water, bentonite, sodium carbonate (Na 2CO 3) and an admixture which are mixed and stirred; wherein the weight ratio of each component is as follows: water: bentonite: soda ash (Na 2CO 3): admixture = 400-450.
Example 2
The thixotropic slurry for the earth pressure balance jacking pipe in the anhydrous sand layer is prepared by the following components in percentage by weight as described in example 1: water: and (3) bentonite: soda ash (Na 2CO 3): admixture = 400.
Still further, the admixture is sodium carboxymethyl cellulose (CMC).
Further, the PH value of the water is more than or equal to 7. To prevent corrosion of the pipe.
Further, sodium bentonite can be adopted as the bentonite.
Further, the substitution degree of the sodium carboxymethyl cellulose is 0.7-1.2.
Example 3
The preparation method of the thixotropic slurry for the earth pressure balance pipe jacking in the anhydrous sand layer, which is described in the embodiment 1 or the embodiment 2, comprises the following steps,
adding clear water into the stirring barrel;
starting a stirring device in the stirring barrel, adding the bentonite, the soda ash and the admixture during stirring, and enabling the weight ratio of each component to be as follows: water: bentonite: soda ash: admixture = 400-450;
and after the ingredients including the bentonite, the soda ash and the admixture are mixed, continuously stirring for a preset time to finish the preparation of the thixotropic slurry.
Example 4
The method for preparing the thixotropic slurry for the earth pressure balance push pipe in the anhydrous sand layer, which is described in embodiment 3, may further specifically be that when clear water is added into the stirring barrel, the PH of the clear water is greater than or equal to 7.
In a further specific aspect, the stirring barrel and the stirring device inside the stirring barrel are configured as an electric stirring barrel.
And specifically, when the bentonite, the soda ash and the admixture are added into the clear water, the stirring speed is 550-600r/min.
Specifically, when the bentonite, the soda ash and the admixture are added into the clear water, the bentonite, the soda ash and the admixture are sequentially added in sequence.
Specifically, the bentonite, the soda ash and the admixture are added into the clear water, so that the weight ratio of the components is as follows: water: and (3) bentonite: soda ash: admixture = 400.
Specifically, after the ingredients including the bentonite, the soda ash and the admixture are mixed, the preset time for continuing stirring is 24 hours.
And specifically, after the ingredients comprising the bentonite, the soda ash and the admixture are mixed, the rotation speed of continuous stirring is 550-600r/min.
Specifically, after the ingredients including the bentonite, the soda ash and the admixture are mixed, the opening of the stirring barrel is covered with a preservative film, and then the stirring is continued.
The performance indexes of the prepared thixotropic slurry are as follows: the specific gravity is 1.1-1.16g/cm < 3 >, the static shear force is 100Pa, the funnel viscosity is more than 30s, the water loss is 10ml/30min, and the colloid rate is more than 96%.
Example 5
The method for grouting thixotropic slurry for a soil pressure balance pipe jacking in an anhydrous sand layer, which is described in embodiment 1 or embodiment 2, comprises the following steps,
connecting grouting equipment with a grouting pipe;
pouring the thixotropic slurry into the grouting pipe;
pressing the thixotropic slurry in the grouting pipe by the grouting equipment, and then jacking the pressed thixotropic slurry;
the press-in operation and the tack-up operation are repeated.
Example 6
The grouting method of thixotropic slurry for a soil pressure balance pipe jacking in an anhydrous sand layer described in embodiment 5 may further specifically be implemented by supplementing the thixotropic slurry into the grouting pipe when necessary.
Specifically, the progress of each pusher section in the slurry pipe may be checked.
Specifically, when the thixotropic slurry that has been pushed in is pushed in, the slurry formation in each advancing stage in the slurry pipe may be checked.
In a further specific aspect, a check valve is installed at a grouting hole at the end of the grouting pipe.
Specifically, the grouting amount of the thixotropic slurry can be calculated according to 2-3 times of the volume of an annular gap between the grouting pipe and a surrounding soil layer.
In the grouting process, the technological parameters of grouting flow and grouting pressure can be adjusted according to actual monitoring data of drag reduction and ground deformation control.
It may also be specific to set the thixotropic slurry grouting pressure to be greater than the static earth pressure.
Specifically, the upper limit of the calculated value of the soil bin pressure during tunneling is adopted as the static soil pressure.
Specifically, during tunneling, the range of the calculated value of the soil bin pressure is set to be from the active soil pressure to the static soil pressure.
Further specifically, the active earth pressure may be set to 0.06 MPa.
Specifically, the static soil pressure may be set to 0.08MPa.
Specifically, the calculated value of the soil bin pressure can be set to be 0.06-0.08MPa.
Further specifically, the thixotropic slurry grouting pressure is set to be 0.1-0.15MPa.
Specifically, the grouting equipment may be a grouting pump.
It may also be specific that the grouting pump is a hydraulic grouting pump.
The grouting method of the thixotropic slurry for the earth pressure balance pipe jacking in the anhydrous sand layer described in embodiment 5 or embodiment 6 is characterized in that the thixotropic slurry is prepared by the preparation method of the thixotropic slurry for the earth pressure balance pipe jacking in the anhydrous sand layer described in embodiment 3 or embodiment 4.
Example 7
Referring to fig. 1 and 2, the slurry replacement method of thixotropic slurry for earth pressure balance pipe jacking in an anhydrous sand layer in the embodiment 1 or 2 comprises the following steps,
grouting and slurry replacement: sequentially injecting cement slurry from one end of the grouting pipe, replacing the thixotropic slurry with the cement slurry, sequentially opening a grouting hole and a slurry discharge hole in the grouting pipe, and performing circulating operation;
in the early stage of replacement grouting, the thixotropic slurry flows out;
as the replacement grouting is carried out and the cement slurry is injected, closing the slurry discharge hole when the pure cement slurry begins to flow out;
and after the grouting body is condensed, removing the grouting pipe, and plugging the grouting hole by using a plug.
Example 8
The grout replacement method for thixotropic slurry for earth pressure balance jacking pipes in the anhydrous sand layer in embodiment 7 may further specifically be that during replacement grouting, grouting is performed once every cycle, and grouting is performed once every two sections of grouting pipes.
Specifically, during replacement grouting, the thixotropic slurry is injected from the grouting holes of the first section of the grouting pipe, and according to the slurry injection amount and the pressure condition, the grouting holes of the second section of the grouting pipe are opened to discharge the slurry, so that the slurry discharge is performed from the bottom to the top in sequence.
Specifically, when the pure cement slurry starts to flow out, after the slurry discharge hole is closed, the next cycle is started, and the grouting is started from the second section of the grouting pipe, and the slurry is discharged from the third section of the grouting pipe, and the cycle is sequentially started.
In particular, the overflowed slurry can be treated in a centralized manner.
The grouting amount can be set to be 1.5-3 times of the gap between the wall of the grouting pipe and the soil body.
Specifically, the slurry is cement slurry.
Specifically, the cement slurry can be stirred into slurry.
Specifically, the cement slurry is stirred into slurry by a vertical stirrer.
Specifically, the cement slurry is stirred into slurry by a vertical stirrer, and then flows into a slurry pool to be placed for 30-40min for use.
Specifically, the water-cement ratio of the cement slurry is set to be 0.8.
Specifically, when the grout outside the pipeline is replaced through the grouting holes, the grouting pressure can be determined according to different water and soil pressures.
Specifically, the grouting pressure may be set to 0.5 to 1.0MPa.
And specifically, grouting by using a grouting machine.
In a further specific aspect, the grouting machine is a double-fluid grouting machine.
Specifically, during grouting and slurry replacement grouting, a grouting pump is started first, a grouting valve is closed, a slurry return valve is opened, after the operation is circulated for a set time, a grouting pipe valve is opened, a slurry discharge valve of a slurry discharge pipe section is opened simultaneously, slurry is sequentially discharged from the bottom upwards, thixotropic slurry is discharged at the early stage, and the discharged slurry is changed into the slurry along with the injection of the slurry; and after the replacement is finished, closing the slurry discharge valve, and after the grouting is carried out for a set time, starting the grouting and slurry replacement operation of the next cycle period.
Specifically, during grouting and grouting by slurry replacement, the grouting pump is started first, the grouting valve is closed, the grout return valve is opened, and the operation is circulated for 1-2min.
And specifically, after the replacement is finished, closing the slurry discharging valve, and then grouting for a set time of 1-2min.
And in the concrete, during grouting and slurry replacement, the heaving and sinking of the ground can be observed.
Specifically, the setting time of the grouting body is more than 24 hours.
And specifically, whether secondary slurry supplement is needed or not can be determined according to the grouting effect.
The slurry replacement method for thixotropic slurry for earth pressure balance pipe jacking in the anhydrous sand layer described in embodiment 7 or embodiment 8 is characterized in that the thixotropic slurry is prepared by the preparation method for thixotropic slurry for earth pressure balance pipe jacking in the anhydrous sand layer described in embodiment 3 or embodiment 4; the slurry replacement method of the thixotropic slurry for the earth pressure balance push pipe in the anhydrous sand layer described in embodiment 7 or embodiment 8 can be used for the slurry replacement in the grouting method of the thixotropic slurry for the earth pressure balance push pipe in the anhydrous sand layer described in embodiment 5 or embodiment 6.
Sodium carboxymethyl cellulose is a high polymer cellulose ether prepared by chemically modifying natural cellulose, and the structure of the sodium carboxymethyl cellulose is mainly formed by connecting D-glucose units through beta (1 → 4) glycosidic bonds. The main reaction is as follows: the natural cellulose firstly undergoes an alkalization reaction with NaOH, and with the addition of chloroacetic acid, hydrogen on a hydroxyl group on a glucose unit of the natural cellulose undergoes a substitution reaction with a carboxymethyl group in the chloroacetic acid. In particular, the structural formula is known, wherein each glucose unit has 3 hydroxyl groups, namely C2, C3 and C6 hydroxyl groups, and the degree of substitution of the hydrogen on the hydroxyl group of the glucose unit by the carboxymethyl is represented by the substitution degree; for example, the hydrogens on 3 hydroxyl groups on each unit are substituted with carboxymethyl groups, defined as a degree of substitution of 3.
In addition, the bentonite meets the relevant requirements of GB/T20973-2007, as shown in the table I.
Further, sodium carbonate is of type I, meeting the requirements of GB210.1-2004, as shown in table two:
the thixotropic slurry for the earth pressure balance top pipe in the anhydrous sand layer has the slurry material ratio shown in the table III:
according to the grouting method of the thixotropic slurry for the earth pressure balance jacking pipe in the anhydrous sand layer, the grouting mode follows the principle of pressing first, then jacking, pressing along with jacking and timely slurry supplement, and synchronous grouting is mainly used and slurry supplement is used as an auxiliary. During the advancement, the progress of each advancement section is frequently checked for the formation of slurry. The grouting equipment and the grouting pipeline need to have good reliability, sufficient pressure resistance and good sealing performance. Set up a check valve in the slip casting hole, avoid the outer soil of thick liquid pipe to flow backward and block up the slip casting hole, avoid influencing the slip casting effect. The grouting amount of the thixotropic slurry can be estimated according to 2-3 times of the volume of an annular gap between the pipeline and the surrounding soil layer. In the grouting process, technological parameters such as grouting flow, grouting pressure and the like are adjusted in time according to actual monitoring data of resistance reduction and ground deformation control. According to the calculated value of the soil cabin pressure during tunneling, the pressure is 0.06-0.08MPa (active soil pressure-static soil pressure), the grouting pressure of the thixotropic slurry is greater than the static soil pressure by 0.08MPa, and according to the construction experience of rectangular pipe jacking, the pressure value is set to be 0.1-0.15MPa, so that the disturbance to the stratum is reduced while the thixotropic slurry is ensured to be injected. Thixotropic slurry injection may employ a hydraulic grouting pump that precisely regulates pressure and flow.
According to the slurry replacement method of thixotropic slurry for the earth pressure balance jacking pipe in the anhydrous sand layer, replacement grouting is sequentially carried out from one end, one pipe joint is poured and put in each cycle, and each two pipe joints are circulated once. And (3) injecting cement slurry from the grouting holes of the first section of pipe joint, opening the grouting holes of the second section according to the injection amount and pressure condition of the slurry, and sequentially performing slurry discharge from the bottom to the top. When the pure cement slurry liquid begins to flow out, the slurry discharge hole is closed, and the next circulation is started. Grouting is started from the grouting pipe of the second section of pipe joint, grouting is simultaneously discharged from the third section of pipe joint, and the like. And carrying out centralized treatment on the overflowed mud. The grouting amount is preferably 1.5-3 times of the gap between the pipe wall and the soil body. When the cement slurry is prepared, the cement slurry is selected from the cement slurry, the cement is stirred into the slurry by a vertical stirrer, and the slurry flows into a slurry tank to be placed for 30-40 minutes for use, so that the effective slurrying of the cement is ensured, and the viscosity of the cement slurry is moderate.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.
Claims (2)
1. A slurry replacement method of thixotropic slurry for a soil pressure balance pipe jacking in an anhydrous sand layer is characterized by comprising the following steps of,
grouting and slurry replacement: sequentially injecting cement grout from one end of the grouting pipe, replacing the thixotropic slurry with the cement grout, sequentially opening a grouting hole and a grout discharging hole in the grouting pipe, and performing cyclic operation;
in the early stage of replacement grouting, the thixotropic slurry flows out;
as the replacement grouting is carried out and the cement slurry is injected, closing the slurry discharge hole when the pure cement slurry begins to flow out;
when thixotropic slurry is replaced, discharging slurry once every cycle of grouting, and circulating once every two sections of grouting pipes; injecting the cement slurry from the grouting holes of the first section of the grouting pipe, and opening the grouting holes of the second section of the grouting pipe for grouting according to the grouting injection amount and pressure condition so that grouting is performed from the bottom to the top in sequence;
and after the grouting body is condensed, removing the grouting pipe, and plugging the grouting hole by using a plug.
2. The grout replacement method of thixotropic slurry for earth pressure balance pipe jacking in an anhydrous sand layer as claimed in claim 1, wherein during grouting and grout replacement grouting, the grouting pump is first opened, the grouting valve is closed, the grout return valve is opened, after the above operations are circulated for a set time, the valve of the grouting pipe is opened, the grout discharge valve of the grout discharge pipe section is simultaneously opened, grout is sequentially discharged from the bottom upwards, the thixotropic slurry is discharged at the early stage, and the discharged slurry is changed into the grout as the grout is injected; and after the replacement is finished, closing the slurry discharge valve, and after the grouting is carried out for a set time, starting the grouting and slurry replacement operation of the next cycle period.
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| ZA2021/09167A ZA202109167B (en) | 2021-02-02 | 2021-11-17 | Thixotropic mud for earth pressure balance jacking pipe in anhydrous sand layer, and preparation method, grouting method and slurry replacement method thereof |
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