CN113105897A - Universal muck modifier for earth pressure balance shield and muck modification method - Google Patents
Universal muck modifier for earth pressure balance shield and muck modification method Download PDFInfo
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- CN113105897A CN113105897A CN202110359948.6A CN202110359948A CN113105897A CN 113105897 A CN113105897 A CN 113105897A CN 202110359948 A CN202110359948 A CN 202110359948A CN 113105897 A CN113105897 A CN 113105897A
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- anionic polyacrylamide
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- 239000003607 modifier Substances 0.000 title claims abstract description 84
- 238000002715 modification method Methods 0.000 title description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 45
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims abstract description 42
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims abstract description 40
- 239000002689 soil Substances 0.000 claims abstract description 38
- 125000000129 anionic group Chemical group 0.000 claims abstract description 36
- 230000006872 improvement Effects 0.000 claims abstract description 27
- 239000011550 stock solution Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 71
- 238000002347 injection Methods 0.000 claims description 27
- 239000007924 injection Substances 0.000 claims description 27
- 239000004576 sand Substances 0.000 claims description 22
- 230000015572 biosynthetic process Effects 0.000 claims description 18
- 239000004927 clay Substances 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 abstract description 7
- 239000007864 aqueous solution Substances 0.000 abstract description 6
- 229920003023 plastic Polymers 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 9
- 239000006260 foam Substances 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229920002125 Sokalan® Polymers 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000004584 polyacrylic acid Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- -1 mudstone Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0642—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield having means for additional processing at the front end
- E21D9/0678—Adding additives, e.g. chemical compositions, to the slurry or the cuttings
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Soil Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a general muck modifier for a soil pressure balance shield and an improvement method thereof, wherein the modifier is a muck modifier stock solution formed by mixing high-molecular-weight anionic polyacrylamide, low-molecular-weight sodium polyacrylate and water; wherein: the molecular weight of the anionic polyacrylamide is 1000-1600 ten thousand, and the molecular weight of the sodium polyacrylate is 3000-5000. The muck modifier is diluted into a low-concentration aqueous solution and is injected into the front of the cutter head and/or the soil cabin, the modified fluid plastic muck cannot be diluted by external water, the internal water is not easy to lose, and the muck particles are not easy to bond. The muck improvement system adopts variable frequency control, the adding amount and the concentration can be controlled in real time, the improved muck is not easy to gush and cake, and meanwhile, the muck improvement cost is low, so that the muck improvement system is worthy of popularization and application in the national range.
Description
Technical Field
The invention relates to muck improvement of an earth pressure balance shield, in particular to a universal muck modifier for the earth pressure balance shield and a muck improvement method.
Background
The shield method is widely applied to the subways of various big cities by virtue of the advantages of safety, reliability, rapidness, economy, environmental protection and the like. Earth pressure balance shields are increasingly being used in urban subway tunnel construction.
The improvement of the earth pressure balance shield muck plays an important role in shield construction. The existing slag soil improvement materials mainly comprise foam, bentonite slurry, polymer aqueous solution, water and the like. The foam plays an important role in improving the muck of the earth pressure balance shield due to multiple advantages of high foaming rate, good lubricity, low cost, convenient operation and the like, and is widely applied to various geotechnical strata such as silt stratum, mudstone stratum, sand layer, sand-gravel stratum and the like.
At present, two kinds of muck-improving materials are generally selected for comprehensive muck improvement, for example, a sandy gravel stratum is selected from foam and bentonite slurry, a mudstone stratum is selected from foam and water, a sand layer rich in water is selected from foam and polymer water solution, and the like. However, in the actual construction of the shield, the mud cake or the gushing often occurs, the mud cake can also occur when the polymer is added after the gushing, and the mud cake is difficult to be foamed by adopting the dispersing agent after the mud cake is formed.
Due to the fact that the special polymer and the dispersing agent for the shield in the market are high in cost, the special polymer and the dispersing agent are only used when problems occur in shield project construction, and the phenomenon that soil pressure balance shield construction is subjected to mud cake forming or gushing often occurs. The existing method is urgently needed to find a low-cost and general muck modifier, which can not form mud cakes and gush and can improve the construction progress by injecting the muck modifier in the shield tunneling process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a general muck modifier for a soil pressure balance shield and a muck modification method. Except adopting foam improvement, the low-concentration polyacrylamide and aqueous solution of sodium polyacrylate are injected into different positions to comprehensively improve the muck, so that the muck reaches a flow plastic state that external water cannot invade, internal water cannot easily run off, particles cannot easily bond, and the muck and water cannot easily separate (namely mud cakes cannot easily be formed and gushes cannot easily).
The purpose of the invention is realized by the following technical scheme:
a general muck modifier for a soil pressure balance shield is prepared by mixing high molecular weight anionic polyacrylamide, low molecular weight sodium polyacrylate and water to form a muck modifier stock solution; wherein: the molecular weight of the anionic polyacrylamide is 1000-1600 ten thousand, and the molecular weight of the sodium polyacrylate is 3000-5000.
As a preferable mode, the muck modifier is prepared by adopting different anionic polyacrylamide, sodium polyacrylate and water mixing ratios in different stratums.
Preferably, the general-purpose muck improver stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1600 ten thousand molecular weight anionic polyacrylamide: sodium polyacrylate with a molecular weight of 5000: the mass ratio of water is 5:2: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:2: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 4:4: 1000;
clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 4:5: 1000.
Preferably, the general-purpose muck improver stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1400 million molecular weight anionic polyacrylamide: sodium polyacrylate of 4000 molecular weight: the mass ratio of water is 6:3: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 6:3: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:5: 1000;
clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:6: 1000.
Preferably, the general-purpose muck improver stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1000 million molecular weight anionic polyacrylamide: 3000 molecular weight poly (sodium acrylate): the mass ratio of water is 7:4: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 7:4: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 6:6: 1000; clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:7: 1000.
A method for improving muck of a soil pressure balance shield is realized by a muck improvement system, wherein the muck improvement system comprises a muck modifier mixing unit and a muck modifier injecting unit;
the muck modifier injection unit comprises injection equipment, the injection equipment is connected with the muck modifier mixing unit, and an outlet of the injection equipment is communicated with the front of the cutter head and/or the soil cabin;
high-pressure water and the original solution of the muck modifier are mixed and then enter the mixing box through the first one-way valve, and the muck modifier mixed solution in the mixing box can be sprayed to the front of the cutter head and/or the soil cabin through injection equipment.
Preferably, the muck modifier injection unit is composed of three sets of injection devices, and each set of injection device comprises a second stop valve, a second variable frequency screw pump, a second safety overflow valve, a third liquid flow sensor, a pressure gauge, a pressure sensor, a second one-way valve, a third stop valve, a relevant pipeline and other parts.
Preferably, outlets of the three sets of equipment are respectively connected to the front of the center of the cutter head, the center of the soil cabin and the upper part of the soil cabin.
As a preferred mode, the working flow of the muck modifier mixing unit is as follows:
the stock solution tank is filled with a general-purpose muck modifier stock solution. When the third liquid level sensor shows that the third liquid level sensor is empty (the mixing box is about to be empty), the electric switch is automatically turned on, high-pressure water enters the pipeline from the water inlet, the second liquid flow sensor shows the water flow, the theoretical original liquid flow of the muck modifier is calculated according to the concentration (such as 1%) of the original liquid of the general muck modifier input by a shield driver in the water, the first variable-frequency screw pump is started to pump the original liquid of the muck modifier into the pipeline to be mixed with the high-pressure water entering the water inlet, the flow measured by the second liquid flow sensor is compared with the calculated original liquid flow of the theoretical muck modifier, and the rotating speed of the first variable-frequency screw is adjusted in real time, so that the purpose that the actual flow is consistent with the theoretical.
Preferably, when the first liquid level sensor displays empty (no original liquid of the soil improver in the original liquid tank), the first variable-frequency screw pump is not allowed to be started;
when the original hydraulic pressure of the muck modifier pumped out by the first variable-frequency screw pump is higher than the overflow pressure of the first safety overflow valve, the first safety overflow valve is opened, and the original muck modifier overflows back to the original liquid tank to protect the first variable-frequency screw pump.
The invention has the beneficial effects that: the invention provides a general muck modifier for a soil pressure balance shield and a muck modification method. The improved residue soil is not easy to gush and cake, and the residue soil improvement cost is low, so the method is worthy of popularization and application across the country.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a muck reclamation system according to an embodiment of the invention;
in the figure, 1-a raw liquid tank, 2-a first stop valve, 3-a first liquid level sensor, 4-a first variable frequency screw pump, 5-a first safety overflow valve, 6-a first liquid flow sensor, 7-a second liquid flow sensor, 8-an electric switch, 9-a first one-way valve, 10-a mixing box, 11-a second liquid level sensor, 12-a third liquid level sensor, 13-a fourth liquid level sensor, 14-a second stop valve, 15-a second variable frequency screw pump, 16-a second safety overflow valve, 17-a third liquid flow sensor, 18-a pressure gauge, 19-a pressure sensor, 20-a second one-way valve and 21-a third stop valve.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "fixed" should be construed broadly and include, for example, fixed connections, detachable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the presence of a first feature above or below a second feature may encompass both the first and second features being in direct contact, and also may encompass both the first and second features being in contact, not being in direct contact, but rather being in contact with another feature therebetween. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. Including a first feature being directly below and obliquely below a second feature, or simply indicating that the first feature is at a lesser elevation than the second feature, if present below, under or below the second feature.
Example one
A general muck modifier for a soil pressure balance shield is prepared by mixing high molecular weight anionic polyacrylamide, low molecular weight sodium polyacrylate and water to form a muck modifier stock solution; wherein: the molecular weight of the anionic polyacrylamide is 1000-1600 ten thousand, and the molecular weight of the sodium polyacrylate is 3000-5000.
The general muck modifier is used for a soil pressure balance shield, the muck modifier is diluted into a low-concentration aqueous solution and is injected into the front of a cutter head and/or a soil cabin, the modified plastic muck cannot be diluted by external water, the internal water is not easy to run off, the muck particles are not easy to bond, and the muck and the water are not easy to separate. The improved residue soil is not easy to gush and cake, and the residue soil improvement cost is low, so the method is worthy of popularization and application across the country.
Example two
In order to achieve a better effect, the muck modifier is prepared from different ground layers by adopting different mixing ratios of anionic polyacrylamide, sodium polyacrylate and water.
The general-purpose muck modifier stock solution is mainly formed by mixing polyacrylamide, sodium polyacrylate and water, wherein the larger the stratum particles (such as sand pebbles, sand and the like) are, the higher the polyacrylamide concentration is, the lower the sodium polyacrylate concentration is, the smaller the stratum particles (such as mudstone, clay and the like) are, the lower the polyacrylamide concentration is, and the higher the sodium polyacrylate concentration is.
By utilizing the characteristic that the polyacrylamide aqueous solution has a net structure, the improved muck has the characteristics that external water cannot invade into the muck and internal water cannot leave out. The polyacrylic acid sodium aqueous solution is utilized to form an electric double layer structure on the surface of the muck particles, so that the improved muck particles have the characteristics of being far away due to electrostatic repulsion and not easy to bond.
EXAMPLE III
The addition of polyacrylamide and sodium polyacrylate can be properly adjusted according to the actual conditions of stratum water content and the like by the general muck modifier stock solution. Adjusting principle: 0.6 or less of anionic polyacrylamide: the polyacrylic acid sodium is less than or equal to 3.
The general muck modifier stock solution has the following formula:
example four
The general muck modifier stock solution has the following formula:
EXAMPLE five
The general muck modifier stock solution has the following formula:
EXAMPLE six
A method for improving muck of a soil pressure balance shield is realized by a muck improvement system, wherein the muck improvement system comprises a muck modifier mixing unit and a muck modifier injecting unit;
the muck modifier injection unit comprises injection equipment, the injection equipment is connected with the muck modifier mixing unit, and an outlet of the injection equipment is communicated with the front of the cutter head and/or the soil cabin.
High-pressure water and the original solution of the muck modifier are mixed and then enter the mixing box 10 through the first one-way valve 9, and the muck modifier mixed solution in the mixing box 10 can be sprayed to the front of the cutter head and/or the soil cabin through injection equipment.
The embodiment mainly embodies that the muck modifier mixed solution is injected in front of the cutter head and/or in the soil cabin to realize muck modification.
EXAMPLE seven
In order to improve the muck better, the modifier is injected into the muck where the muck is easy to form mud cakes or main parts, so that the improvement effect is optimized.
As shown in fig. 1, the muck modifier injection unit is composed of three sets of injection devices, each set of injection device comprises a second stop valve 14, a second variable frequency screw pump 15, a second safety overflow valve 16, a third liquid flow sensor 17, a pressure gauge 18, a pressure sensor 19, a second check valve 20, a third stop valve 21, related pipelines and other parts.
The outlets of the three sets of equipment are respectively connected to the front of the center of the cutter head, the center of the soil cabin and the upper part of the soil cabin.
A second stop valve 14, a second variable frequency screw pump 15, a third liquid flow sensor 17, a pressure gauge 18, a pressure sensor 19, a second check valve 20 and a third stop valve 21 are sequentially arranged on a pipeline between the mixing box 10 and the cutter head, and a second safety overflow valve 16 is connected with the second variable frequency screw pump 15 in parallel through a pipeline.
Example eight
A second liquid level sensor 11, a third liquid level sensor 12 and a fourth liquid level sensor 13 are mounted on the mixing tank 10, wherein the third liquid level sensor 12 is arranged on the fourth liquid level sensor 13, and the second liquid level sensor 11 is arranged on the third liquid level sensor 12.
The working process of the muck modifier mixing unit is as follows:
the stock solution tank 1 is filled with a general-purpose muck modifier stock solution. When the third liquid level sensor 12 is empty or no liquid level signal is detected (the mixing box 10 is empty), the electric switch 8 is automatically opened, high-pressure water enters the pipeline from the water inlet, the second liquid flow sensor 7 displays water flow, the theoretical original liquid flow of the muck improver is calculated according to the concentration (such as 1%) of the universal original liquid of the muck improver input by a shield driver in the water, the first variable-frequency screw pump 4 is started, the original liquid of the muck improver is pumped into the pipeline to be mixed with the high-pressure water entering the water inlet, the flow measured by the second liquid flow sensor 7 is compared with the calculated original liquid flow of the theoretical muck improver, and the rotating speed of the first variable-frequency screw is adjusted in real time, so that the purpose that the actual flow is infinitely close to the theoretical flow (the error is not more than 5%). The muck improvement system adopts frequency conversion control, and the adding amount and the concentration can be controlled in real time.
Example nine
The slag modifying agent mixing unit comprises a raw liquid tank 1, a first stop valve 2, a first liquid level sensor 3, a first variable frequency screw pump 4, a first safety overflow valve 5, a first liquid flow sensor 6, a second liquid flow sensor 7, an electric switch 8, a first check valve 9 and a mixing box 10. As shown in fig. 1, a first stop valve 2 is connected with a raw liquid tank 1 through a pipeline, the rear end of the first stop valve 2 is connected with a first safety overflow valve 5, two ends of the first safety overflow valve 5 are connected with a pipeline in parallel, and a first liquid level sensor 3, a first variable frequency screw pump 4 and a first liquid flow sensor 6 are arranged on the pipeline. The first safety overflow valve 5 is connected with the mixing box 10 through a first pipeline, a one-way valve is installed on the first pipeline, a water inlet pipeline is communicated with the first pipeline, a water inlet is formed in the end portion of the water inlet pipeline, and a second liquid flow sensor 7 and an electric switch 8 are installed on the water inlet pipeline.
When the first liquid level sensor 3 displays empty or does not detect a liquid level signal (no muck improver stock solution is in the stock solution tank), the first variable-frequency screw pump 4 is not allowed to be started;
when the original hydraulic pressure of the muck modifier pumped out by the first variable-frequency screw pump 4 is higher than the overflow pressure of the first safety overflow valve 5, the first safety overflow valve 5 is opened, and the original muck modifier overflows back to the original liquid tank 1 to protect the first variable-frequency screw pump 4.
Example ten
As shown in fig. 1, the operation flow of the muck modifier injection unit is controlled as follows: along with the shield tunneling, foam is injected in front of the cutter head to improve the muck, one set, two sets or three sets of muck modifier injection units are started, muck modifier mixed liquid enters an inlet of a second variable-frequency screw pump 15 through a second stop valve 14, high-pressure mixed liquid is pumped out of an outlet of the second variable-frequency screw pump 15 and enters a muck improvement part through a third liquid flow sensor 17, a pressure gauge 18, a pressure sensor 19, a second one-way valve 20 and a third stop valve 21.
According to the comparison between the required flow of the mixed liquid of each set of equipment input by a shield driver and the actual flow of the third liquid flow sensor 17, the rotating speed of the second variable-frequency screw pump 15 can be adjusted in real time so as to achieve the purpose of infinitely approaching the designed flow of the mixed liquid (the error is not more than 5%). The muck improvement system adopts frequency conversion control, and the adding amount and the concentration can be controlled in real time.
When the pressure of the mixed liquid of the muck modifier pumped out by the second variable-frequency screw pump 15 is higher than the overflow pressure of the second safety overflow valve 16, the second safety overflow valve 16 is opened, and the mixed liquid of the muck modifier overflows back to the mixing tank 10 to protect the second variable-frequency screw pump 15. When the fourth level sensor 13 indicates empty (the mixing tank 10 is empty), the second variable frequency screw pump 15 is not allowed to start.
EXAMPLE eleven
As shown in figure 1, the first one-way valve 9 and the second one-way valve 20 mainly prevent liquid from flowing backwards. The first stop valve 2, the second stop valve 14 and the third stop valve 21 mainly function to open and close pipelines, are in an open state during normal operation, and are in a closed state when maintenance is required. The pressure gauge 18 and the pressure sensor 19 can observe the pressure of the mixed liquid in the pipeline in real time, and accurately judge whether the pipe is blocked.
In order to ensure all-round improvement of the muck, mixed liquid is injected into the center in front of the cutter head, the center of the soil cabin and the upper part of the soil cabin.
The concentration of the general-purpose muck modifier stock solution in the mixed solution is generally set to be 0.5-1.5%. Excavating solid earth volume of 105.2m according to the excavation diameter of 8630mm and the excavation distance of 1800mm per ring3Adding 20m of mixed solution3(5 kg of polyacrylamide, 2kg of sodium polyacrylate and 1% of mixed solution concentration in each ton of stock solution), 1kg of polyacrylamide (1kg of 20 yuan) and 0.4kg of sodium polyacrylate (1kg of 20 yuan) are required for each ring, and the cost of the residue soil modifier for each ring is 28 yuan.
Through on-the-spot in-service use, when the foam is poured into in the construction of earth pressure balance shield, adopt low concentration polyacrylamide and polyacrylic acid to receive mixed liquid and pour into blade disc the place ahead center, soil cabin center and soil cabin top through dregs improvement system, carry out all-round improvement to the dregs that the cutter was cut off, the dregs after the improvement are difficult to gush promptly, also difficult to the cake that binds, be difficult to bond between the dregs granule simultaneously, the sediment water is difficult to separate, construction progress has been improved, construction cost has been reduced.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, it should be noted that any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a soil pressure balance shield constructs with general type dregs modifier which characterized in that: mixing high molecular weight anionic polyacrylamide, low molecular weight sodium polyacrylate and water to form a residue soil modifier stock solution; wherein: the molecular weight of the anionic polyacrylamide is 1000-1600 ten thousand, and the molecular weight of the sodium polyacrylate is 3000-5000.
2. The universal muck modifier for the earth pressure balance shield according to claim 1, which is characterized in that: the muck modifier is prepared from different anionic polyacrylamide, sodium polyacrylate and water according to different mixing ratios in different stratums.
3. The universal muck modifier for the earth pressure balance shield according to claim 2, wherein the universal muck modifier comprises:
the general muck modifier stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1600 ten thousand molecular weight anionic polyacrylamide: sodium polyacrylate with a molecular weight of 5000: the mass ratio of water is 5:2: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:2: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 4:4: 1000;
clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 4:5: 1000.
4. The universal muck modifier for the earth pressure balance shield according to claim 2, wherein the universal muck modifier comprises:
the general muck modifier stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1400 million molecular weight anionic polyacrylamide: sodium polyacrylate of 4000 molecular weight: the mass ratio of water is 6:3: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 6:3: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:5: 1000;
clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:6: 1000.
5. The universal muck modifier for the earth pressure balance shield according to claim 2, wherein the universal muck modifier comprises:
the general muck modifier stock solution comprises the following components in percentage by weight: the stratum comprises sand pebbles, sand, mudstone and clay stratum;
sandy gravel formation, 1000 million molecular weight anionic polyacrylamide: 3000 molecular weight poly (sodium acrylate): the mass ratio of water is 7:4: 1000;
sand layer: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 7:4: 1000;
a mudstone formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 6:6: 1000;
clay formation: anionic polyacrylamide: sodium polyacrylate: the mass ratio of water is 5:7: 1000.
6. The method is characterized in that the method is realized by a muck improvement system, and the muck improvement system comprises a muck improver mixing unit and a muck improver injection unit;
the muck modifier injection unit comprises injection equipment, the injection equipment is connected with the muck modifier mixing unit, and an outlet of the injection equipment is communicated with the front of the cutter head and/or the soil cabin;
high-pressure water and the original solution of the muck modifier are mixed and then enter the mixing box through the first one-way valve, and the muck modifier mixed solution in the mixing box can be sprayed to the front of the cutter head and/or the soil cabin through injection equipment.
7. The earth pressure balance shield muck improving method according to claim 6, wherein the earth pressure balance shield muck improving method comprises the following steps: the muck modifier injection unit consists of three sets of injection equipment, wherein each set of injection equipment comprises a second stop valve, a second variable frequency screw pump, a second safety overflow valve, a third liquid flow sensor, a pressure gauge, a pressure sensor, a second one-way valve, a third stop valve, related pipelines and the like.
8. The earth pressure balance shield muck improving method according to claim 7, characterized in that: the outlets of the three sets of equipment are respectively connected to the front of the center of the cutter head, the center of the soil cabin and the upper part of the soil cabin.
9. The soil pressure balance shield muck improving method according to claim 6, 7 or 8, wherein the working process of the muck modifier mixing unit is as follows:
when the third liquid level sensor shows that the water level is empty, the electric switch is automatically turned on, high-pressure water enters the pipeline from the water inlet, the second liquid flow sensor shows the water flow, the theoretical original liquid flow of the muck modifier is calculated according to the concentration of the universal original liquid of the muck modifier input by a shield driver in the water, the first variable-frequency screw pump is started to pump the original liquid of the muck modifier into the pipeline to be mixed with the high-pressure water entering the water inlet, the flow measured by the second liquid flow sensor is compared with the calculated original liquid flow of the theoretical muck modifier, and the rotating speed of the first variable-frequency screw is adjusted in real time.
10. The earth pressure balance shield muck improving method according to claim 6, 7 or 8, wherein:
when the first liquid level sensor displays empty, the first variable-frequency screw pump is not allowed to be started;
when the original hydraulic pressure of the muck modifier pumped out by the first variable-frequency screw pump is higher than the overflow pressure of the first safety overflow valve, the first safety overflow valve is opened, and the original muck modifier overflows back to the original liquid tank to protect the first variable-frequency screw pump.
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Application publication date: 20210713 |