CN110340112B - Method and system for comprehensively treating and ecologically utilizing soil pressure balance shield muck and resources - Google Patents
Method and system for comprehensively treating and ecologically utilizing soil pressure balance shield muck and resources Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000002689 soil Substances 0.000 title claims abstract description 36
- 239000002002 slurry Substances 0.000 claims abstract description 156
- 238000003860 storage Methods 0.000 claims abstract description 93
- 239000004576 sand Substances 0.000 claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 50
- 239000002893 slag Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000008719 thickening Effects 0.000 claims abstract description 27
- 238000012216 screening Methods 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 37
- 238000000926 separation method Methods 0.000 claims description 36
- 238000011065 in-situ storage Methods 0.000 claims description 29
- 238000004064 recycling Methods 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 19
- 238000007711 solidification Methods 0.000 claims description 17
- 230000008023 solidification Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 13
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 9
- 238000005187 foaming Methods 0.000 claims description 7
- 238000004537 pulping Methods 0.000 claims description 7
- 239000002969 artificial stone Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 229910010293 ceramic material Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 208000005156 Dehydration Diseases 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a comprehensive treatment and resource ecological utilization method and a system for earth pressure balance shield muck. The system of the resource treatment method comprises: the pre-screening screen is connected with the storage bin through a conveying belt; the undersize of the pre-sieve is connected with a slurry pond, the slurry pond is connected with a slurry separating device, the slurry separating device is connected with a spiral sand washer, the screen of the spiral sand washer is connected with a third storage bin, the spiral sand washer is connected with the slurry separating device, the slurry separating device is connected with a thickening device, the thickening device is connected with a flocculating agent preparation device, the thickening device is connected with a slurry making machine, the slurry making machine is connected with a curing agent storage tank, and the slurry making machine is connected with a curing pond; the overflow port of the thickening device is connected with the clean water tank. According to different slag soil conditions, different treatment schemes are provided, and targeted treatment of the slag soil is realized.
Description
Technical Field
The invention relates to the field of slurry treatment, in particular to a method and a system suitable for comprehensive treatment of earth pressure balance shield muck and ecological resource utilization.
Background
As the soil pressure shield residue soil contains the surfactant, the soil pressure shield residue soil is difficult to dry and has high fluidity, the occupied area of the soil is gradually increased along with the increase of the urban shield residue soil, and the open-air stacking is still the main aspect. If the shield slag soil enters the receiving field without environmental protection treatment, a large amount of foam can be generated once the contained foaming agent enters the water body, so that normal production and life are affected, and meanwhile, adverse effects are caused on microorganisms in the water. The untreated mine is directly filled or piled up in large quantities, and potential geological disasters can be caused. In the prior art, a scheme of adopting cyclone screening and solid-liquid separation to carry out outward of mud cakes is also adopted, for example, a method and equipment for environmental protection regeneration treatment of earth pressure balance shield muck are described in China patent document CN 104858048A, multistage cyclone screening and filter pressing dehydration treatment are adopted, but the method does not fully consider the adaptability of different strata of the earth pressure shield muck, if the whole section of the standard section is clay or silt stratum, no sand and stones can be screened by adopting the method, and a mode of adopting a filter press as solid-liquid separation is uneconomical and large in occupied area, and engineering construction requirements cannot be met.
Chinese patent document CN 103752074a describes a three-dimensional space integrated slurry purification device, which comprises a combination of a plurality of standard-sized functional frames, wherein a pre-screening frame is arranged above a primary slurry storage tank frame, and a total slurry inlet frame is arranged above the pre-screening frame; a secondary slurry storage tank frame is arranged on one side of the primary slurry storage tank frame, a dewatering screen frame is arranged above the secondary slurry storage tank frame, and a cyclone frame is arranged above the dewatering screen frame; the functional frames are connected through a pipe valve system. Each functional frame is the size of a standard container. Chinese patent document CN206613225U describes an anti-hardening thickener, comprising a box body, wherein the bottom of the box body is provided with an inverted trapezoid bucket, the bottom of the inverted trapezoid bucket is provided with an auger device, and the discharge opening of the auger device is provided with a flashboard; the bottom of the inverted trapezoid bucket is open, the position where the top of the auger device is connected with the bottom of the inverted trapezoid bucket is provided with an open top, the open top is connected with the bottom of the inverted trapezoid bucket, and the spiral blade part of the auger device is positioned in the bottom space of the inverted trapezoid bucket. The device can be used for treating mud, but the water content of the mud after the existing treatment is higher, the mud is unfavorable and transported outwards, the mud is further pressed and dehydrated into mud cakes by adopting a filter press and transported outwards, the treatment efficiency of the filter press is too low, the occupied area is larger, the use is more inconvenient, and the device cannot adapt to the existing shield construction working condition. In addition, the slurry treatment process in the prior art does not fully consider the recycling of related resources, the environmental protection pressure is high, moreover, the treatment of the externally transported muck is improper, and geological disasters such as landslide and the like are easy to occur.
Disclosure of Invention
The invention aims to solve the technical problems of providing a method and a system for comprehensively treating and ecologically utilizing the earth pressure balance shield muck, providing different treatment schemes according to geological conditions of the earth pressure shield muck, realizing targeted treatment of muck, recycling resources and improving economic benefits of muck treatment.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for comprehensively treating and ecologically utilizing soil pressure balance shield slag soil comprises the following steps:
s1, detecting the sand content of the slag soil of the earth pressure balance shield;
S2, adopting a recycling treatment method for the slag soil with the sand content being larger than the limit value, and adopting an in-situ solidification treatment method for the slag soil with the sand content being smaller than the limit value.
In the preferable scheme, the limit value of the sand content is 50% -70%.
In a preferred embodiment, the limit value for the sand content is 60%.
In a preferred embodiment, the recycling treatment method includes the following steps:
S21, mixing the dregs and clear water together to form dregs slurry;
S22, delivering the slurry into a pre-sieve for pre-separation, and delivering sand materials of each layer on the pre-sieve to a second conveyer belt and a third conveyer belt respectively, and delivering particles with different particle diameters to a first storage bin and a second storage bin after sand washing;
The particles with the particle size of 3-20mm are conveyed to the first storage bin by the pre-sieve, and the particles with the particle size of more than 15mm are conveyed to the second storage bin by the pre-sieve;
s23, temporarily storing the undersize slurry in a slurry tank, and conveying the slurry in the slurry tank to a slurry storage tank;
S24, conveying the slurry to a cyclone separation device by a slurry pump, conveying supernatant to an overflow box, conveying lower slurry to a slurry screen, conveying on-screen slag of the slurry screen to a spiral sand washer by a first conveying belt, conveying on-screen particles of the spiral sand washer to a third storage bin, and conveying undersize slurry of the spiral sand washer to a slurry storage pool;
The spiral sand washer is used for conveying particles with the particle diameter of more than 74um to a third storage bin;
s25, delivering the slurry overflowed by the overflow box into a slurry tank, and returning the slag before overflow in the overflow box to the slurry storage tank;
the slurry pump is an adjustable flow pump, and the flow of the slurry pump is controlled according to the flow of the slurry at the lower part of the cyclone separation device;
The mud in the mud pit is sent into a thickening device to be mixed with flocculant; the mixed thick slurry is sent into a pulping machine to be mixed with a curing agent, and the cured slurry is transported out or recycled;
and sending overflow liquid of the thickening device into a clean water tank for recycling.
In the preferred scheme, the in-situ solidification treatment method is that the muck is placed in an in-situ solidification pool, the solidifying agent prepared by the solidifying agent preparation device is conveyed to an in-situ solidification machine, and the solidifying agent is conveyed into the in-situ solidification pool by the in-situ solidification machine and stirred, so that solidification, transportation or recycling of the muck is realized.
A system for the soil pressure balance shield slag soil comprehensive treatment and resource ecological utilization method comprises the following steps:
The outlet of the mud decomposing machine is connected with a pre-sieve, and the sieve of the pre-sieve is connected with a storage bin through a conveying belt;
The under screen of the pre-screen is connected with a slurry pond, the slurry pond is connected with a slurry separating device, the screen of a slurry screen in the slurry separating device is connected with a spiral sand washer through a conveying belt, the screen of the spiral sand washer is connected with a third storage bin, the under screen of the spiral sand washer is connected with the slurry separating device, a discharge port of the slurry separating device is connected with a feed port of a thickening device, the feed port of the thickening device is also connected with a flocculant preparation device, the discharge port of the thickening device is connected with a feed port of a slurry machine, the feed port of the slurry machine is also connected with an outlet of a curing agent storage tank, and the outlet of the slurry machine is connected with the curing pond;
the overflow port of the thickening device is connected with the clean water tank.
In a preferred embodiment, the curing tank is connected to one or more of a foaming material production device, a baking-free ceramic material production device and a artificial stone production device.
In the preferred scheme, a stirring shaft which is horizontally arranged is arranged in the mud decomposing machine and is connected with a motor;
the device is characterized by further comprising a muck temporary storage pool, wherein a lifting machine is arranged in the muck temporary storage pool, an outlet of the lifting machine is positioned above the mud remover, the upper part of the mud remover is also connected with an outlet of a clear water pump, and an inlet of the clear water pump is connected with a clear water pool;
the pre-screening is multi-stage, and the screens of all stages of pre-screening are respectively corresponding to a conveyer belt; each conveyer belt corresponds to a storage bin.
In a preferred scheme, the structure of the mud separating device is as follows: an inlet of the slurry storage tank is connected with an outlet of the spiral sand washer, an inlet of the slurry storage tank is also connected with an outlet of the slurry tank, the slurry storage tank is connected with an inlet of the cyclone separation device through a slurry pump, a supernatant outlet of the cyclone separation device is connected with an inlet of an overflow box, an overflow plate is arranged in the overflow box, an outlet of the overflow box before overflow is connected with the slurry storage tank, and an outlet of the overflow box after overflow is connected with the slurry tank;
the slag outlet of the cyclone separating device is connected with the inlet of the slurry sieve, the outlet of the slurry sieve is connected with a slurry storage tank, and a liquid level control device is arranged in the slurry storage tank.
In the preferred scheme, the structure of curing agent storage tank be, the jar body bottom of curing agent storage tank is equipped with weighing screw conveyer, weighing screw conveyer's export is located the top of pulping machine.
According to the soil pressure balance shield muck comprehensive treatment and resource ecological utilization technology, the method and the system, different treatment schemes are provided for different soil pressure shield muck geological conditions, mainly sand content, so that the muck is treated pertinently, resources can be recycled for reuse, and the economic benefit of muck treatment is improved. Through carrying out the optimization combination with each mud treatment facility and technology, realized the promotion by a wide margin of mud treatment effeciency, can also carry out the classification to the particulate matter of different particle diameters in the handling process between each equipment moreover, realize concrete aggregate grading, improve economic benefits, especially can also be made building component and recycle through the mud after solidifying to geological disasters such as landslide can also be avoided appearing in the mud after solidifying and recycling.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of a recycling system according to the present invention.
FIG. 2 is a schematic diagram of an in-situ curing treatment system according to the present invention.
In the figure: the system comprises a lifting machine 1, a mud remover 2, a stirring shaft 201, a motor 202, a pre-screening 3, a mud separating device 4, a cyclone separating device 41, an overflow box 42, a mud screen 43, a mud storage tank 44, a liquid level control device 45, a slurry pump 46, a spiral sand washer 5, a mud tank 6, a first conveying pump 7, a thickening device 8, a box 81, a spiral conveying device 82, a flocculant preparation device 9, a curing agent storage tank 10, a weighing spiral conveyor 11, a pulping machine 12, a curing tank 13, a foaming material production device 14, a baking-free ceramic material production device 15, an artificial stone production device 16, a second conveying pump 17, a third conveying pump 18, a first conveying belt 19, a second conveying belt 20, a third conveying belt 21, a first storage bin 22, a second storage bin 23, a clean water pump 24, a clean water tank 25, a third storage bin 26, a slag temporary storage tank 29, a curing agent storage tank 291, a water tank 293, a first pump 293, a first curing agent stirring tank 296, a second pump 296, a curing agent tank 296, an in-situ curing device 30 and an in-situ curing machine.
Detailed Description
Example 1:
A method for comprehensively treating and ecologically utilizing soil pressure balance shield slag soil comprises the following steps:
S1, detecting the sand content of the slag soil of the earth pressure balance shield; the detection method can be carried out by using the mud separating device 4 for test separation. The method comprises the steps of weighing a certain amount of muck, sending the muck into a slurry separation device 4, and weighing the separated particles, wherein the percentages between the weight of the particles and the weight of the muck are the sand content of the muck.
S2, adopting a recycling treatment method for the slag soil with the sand content being larger than the limit value, and adopting an in-situ solidification treatment method for the slag soil with the sand content being smaller than the limit value.
In the preferable scheme, the limit value of the sand content is 50% -70%.
In a preferred embodiment, the limit value for the sand content is 60%.
In the preferred scheme, the whole tunneling section is detected in a segmented mode, and different treatment methods are adopted for the slag soil meeting different conditions.
In a preferred embodiment, the recycling treatment method includes the following steps:
S21, mixing the dregs and clear water together to form dregs slurry;
S22, delivering the slurry into a pre-sieve 3 for pre-separation, and delivering sand materials of each layer on the pre-sieve 3 to a second conveying belt 20 and a third conveying belt 21 respectively, and delivering particles with different particle diameters to a first storage bin 22 and a second storage bin 23 after sand washing;
The pre-screening 3 is conveyed to the first storage bin 22 to be particles with the particle size of 3-20mm, and the pre-screening 3 is conveyed to the second storage bin 23 to be particles with the particle size of more than 15 mm;
S23, temporarily storing the undersize slurry of the pre-screen 3 in a slurry tank 28, and conveying the slurry in the slurry tank 28 to a slurry storage tank 44;
S24, conveying the slurry to a cyclone separation device 41 by a slurry pump 46, conveying the supernatant to an overflow box 42, conveying the lower slurry to a slurry screen 43, conveying the on-screen slag of the slurry screen 43 to a spiral sand washer 5 through a first conveying belt 19, conveying the on-screen particles of the spiral sand washer 5 to a third storage bin 26, and conveying the undersize slurry of the spiral sand washer 5 to a slurry storage tank 44;
The spiral sand washer 5 is used for conveying particles with the particle diameter of more than 74um to the third storage bin 26; i.e. d50 > 74. Mu.m. The method has the core that the particles are separated from the slurry so as to offset part or all of the slurry treatment cost, simultaneously, the treatment capacity among the working procedures is matched with each other as much as possible, the grading upgrading of the recycled aggregate can be realized, the subsequent screening working procedures are reduced, and the aim is achieved, and the optimal particle size setting, namely the setting of the screen surface meshes, is very critical. Through measurement and calculation, the optimal balance among efficiency, income and grading requirements can be realized by adopting the setting parameters.
S25, delivering the slurry overflowed by the overflow tank 42 into a slurry tank 6, and returning the slag before overflow in the overflow tank 42 to a slurry storage tank 44;
The slurry pump 46 is an adjustable flow pump, and the flow of the slurry pump 46 is controlled according to the lower slurry flow of the cyclone separation device 41; with this arrangement, the processing efficiency is ensured, and the processing quality is ensured.
The mud in the mud pit 6 is sent into a thickening device 8 to be mixed with flocculant; the mixed thick slurry is sent into a pulping machine 12 to be mixed with a curing agent, and the cured slurry is transported out or recycled;
The overflow liquid of the thickening device 8 is sent into a clean water tank 25 for recycling.
In a preferred scheme, the in-situ solidification treatment method is that the muck is placed in an in-situ solidification pool 302, the solidifying agent prepared by a solidifying agent preparation device 29 is conveyed to an in-situ solidification machine 301, and the solidifying agent is conveyed into the in-situ solidification pool 302 by the in-situ solidification machine 301 and stirred, so that solidification, transportation or recycling of the muck is realized.
Example 2:
As shown in fig. 1, a system for the above-mentioned soil pressure balance shield slag soil comprehensive treatment and resource ecological utilization method:
the outlet of the mud decomposing machine 2 is connected with a pre-sieve 3, and the sieve of the pre-sieve 3 is connected with a storage bin through a conveying belt;
In a preferred scheme, in the mud decomposing machine 2, a stirring shaft 201 which is horizontally arranged is arranged, and the stirring shaft 201 is connected with a motor 202;
The device is also provided with a muck temporary storage tank 27, the muck temporary storage tank 27 is provided with a lifting machine 1, an outlet of the lifting machine 1 is positioned above the mud remover 2, the upper part of the mud remover 2 is also connected with an outlet of a clean water pump 24, and an inlet of the clean water pump 24 is connected with a clean water tank 25; the mud decomposing machine 2 is arranged to mix the dregs with proper water content so as to facilitate the further treatment of subsequent mud treatment equipment, and the structure is one of key points for improving the mud treatment efficiency.
The undersize of the pre-screen 3 is connected with a slurry pond 28, the slurry pond 28 is connected with a slurry separation device 4, the screen of a slurry screen 43 in the slurry separation device 4 is connected with a spiral sand washer 5 through a conveying belt, the screen of the spiral sand washer 5 is connected with a third storage bin 26, the undersize of the spiral sand washer 5 is connected with the slurry separation device 4, the discharge port of the slurry separation device 4 is connected with the feed port of a thickening device 8, the feed port of the thickening device 8 is also connected with a flocculant preparation device 9, the discharge port of the thickening device 8 is connected with the feed port of a slurry machine 12, the feed port of the slurry machine 12 is also connected with the outlet of a curing agent storage tank 10, and the outlet of the slurry machine 12 is connected with a curing pool 13;
the overflow port of the thickening device 8 is connected with a clean water tank 25. The particles with the particle size of more than 74um in the slurry are basically separated through a combined separation mode and used as aggregate, and when the sand content in the slag soil is more than 50% along with the price increase of the aggregate, the slurry treatment cost can be recovered only by recycling the aggregate. The thickener 8 is an anti-hardening thickener described in chinese patent document CN 206613225U.
In a preferred embodiment, the curing tank 13 is connected to one or more of the foaming material producing device 14, the baking-free ceramic material producing device 15 and the artificial stone producing device 16. The slurry after curing in the curing tank 13 is made into a foaming material, such as a foaming block, a ceramic surface material, such as a ceramic tile decorative material by high-pressure pressing. The polymer is blended and pressed into artificial stone for decoration, such as cultural stone. For example, patent document CN107021778a discloses a plant-growing water-permeable concrete system for realizing sludge recycling treatment and a preparation method thereof.
The pre-screening 3 is multi-stage, and the screens of each stage of pre-screening 3 are respectively corresponding to a conveyer belt; each conveyer belt corresponds to a storage bin. In this example, there are two stages, one stage corresponds to particles with a diameter of 3-20mm of the circumscribed circle, and the other stage corresponds to particles with a diameter of more than 15mm of the circumscribed circle. By adopting the parameter, the subsequent slurry treatment efficiency can be greatly improved, and meanwhile, the particles can be graded, so that the concrete aggregate grading is facilitated.
In a preferred embodiment, the slurry separation device 4 has the following structure: an inlet of the slurry storage tank 44 is connected with an outlet of the spiral sand washer 5, an inlet of the slurry storage tank 44 is also connected with an outlet of the slurry tank 28, the slurry storage tank 44 is connected with an inlet of the cyclone separation device 41 through a slurry pump 46, a supernatant outlet of the cyclone separation device 41 is connected with an inlet of an overflow tank 42, an overflow plate is arranged in the overflow tank 42, an outlet of the overflow tank 42 before overflow is connected with the slurry storage tank 44, and an outlet of the overflow tank 42 after overflow is connected with the slurry tank 6; particles above 74um in overflow mud are basically removed, so that the subsequent recovery and reuse of mud are facilitated.
The slag outlet of the cyclone separation device 41 is connected with the inlet of a mud screen 43, the outlet of the mud screen 43 is connected with a mud storage tank 44, and a liquid level control device 45 is arranged in the mud storage tank 44. The liquid level control device 45 can avoid overflow caused by too high liquid level in the slurry storage tank 44, control the load of the whole slurry treatment system in a proper range and prevent damage to the slurry pump 46 caused by too low liquid level.
In a preferred embodiment, the curing agent storage tank 10 is structured such that a weighing screw conveyor 11 is disposed at the bottom of the tank body of the curing agent storage tank 10, and an outlet of the weighing screw conveyor 11 is located above the pulping machine 12. In the pulper 12, the concentrated slurry is thoroughly mixed with the curing agent to prepare for the next recycling process. The curing agent is correspondingly different according to the difference of the subsequent recycling scheme, namely, the difference of the foaming material production device 14, the baking-free ceramic material production device 15 and the artificial stone production device 16.
Example 3:
The inventor finds that the traditional treatment process of the invention 1 has the following two defects when in-situ solidification of the dregs:
Firstly, when curing agent powder is conveyed by a medicament feeding device, the lift is too large, and adverse environmental effects are caused on more concentrated construction sites of a building;
secondly, the mixing between the curing agent powder and the earth pressure shield slag is insufficient, the reaction time is long, and the curing effect is not ideal.
In order to overcome the defects of the traditional process, the inventor researches and provides a curing agent water aqua preparation method. As shown in fig. 2, a curing agent storage tank 291 is connected with a first curing agent stirring tank 294 through an auger, a water tank 292 is connected with the first curing agent stirring tank 294 through a first pump 293 and is used for preparing a curing agent aqua, the first curing agent stirring tank 294 is connected with an in-situ curing machine 301 in an in-situ curing device 30, a stirring roller is arranged at the free end of a mechanical arm of the in-situ curing machine 301, and in operation, the stirring roller is arranged in an in-situ curing tank 302 and is used for injecting the curing agent aqua into the in-situ curing tank 302 while stirring, so that in-situ curing of dregs is realized. In a preferred embodiment, a second curing agent stirring tank 296 is further provided, the volume of the second curing agent stirring tank 296 is larger than the volume of the first curing agent stirring tank 294, the first curing agent stirring tank 294 is connected to the second curing agent stirring tank 296 by a second pump 295, and the water tank 292 is connected to the second curing agent stirring tank 296 by a first pump 293. The scheme improves the solidification effect of the earth pressure shield slag soil and can reduce dust. The in-situ curing device is similar to the device in patent document CN203546709U, and the curing agent is a curing agent recorded in a river and lake sludge recycling method, such as CN 108249713A.
The invention has the technical advantages that:
1) The method has the advantages that the composition of the earth pressure shield muck under different geological conditions is different, the adopted treatment process is different, the treatment requirements of the earth pressure shield muck under different geological conditions can be met to the maximum extent, the adaptability is wide, and the operability is strong.
2) The invention can realize the recycling of modified slurry according to the requirements of users and the recycling of discharged filtrate clean water.
3) The invention can realize whole-course automatic control and on-line monitoring, has high degree of automation and is convenient to overhaul and maintain;
4) The invention adopts integrated and modularized design, is convenient to install and disassemble, has small occupied area and is easy to realize repeated transition and recycling of different sites;
5) The process technology is mature, the equipment is safe and reliable, and the method is applicable to suspension liquid with high slag compressibility or nearly incompressible slag compressibility and has wide application range;
6) Through the conversion from fluid muck to solid muck, the problem of muck emission supervision is solved from the source, and a series of environmental pollution and secondary disaster problems caused by muck direct discharge are avoided;
7) The water content of a condensate formed by the mud processed by the system is low (sand layer is less than or equal to 20 percent and mud layer is less than or equal to 30 percent), so that the phenomenon that slag is leaked in the outward transportation process to influence urban environmental sanitation is avoided, or the condensate can be conveniently manufactured into a needed building material component; meanwhile, the separated clear water can be directly discharged to a sewage pipe network and can be recycled, the discharged waste water reaches the standard of GB8978-1996 integrated sewage discharge standard, and the recycling rate is up to 85%.
The above embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the technical features described in the present invention can be combined with each other without collision. The protection scope of the present invention is defined by the claims, and the protection scope includes equivalent alternatives to the technical features of the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (6)
1. The comprehensive treatment method of the earth pressure balance shield slag soil is characterized by comprising the following steps:
s1, detecting the sand content of the slag soil of the earth pressure balance shield;
S2, adopting a recycling treatment method for the slag soil with the sand content being larger than a limit value, and adopting an in-situ solidification treatment method for the slag soil with the sand content being smaller than the limit value;
The in-situ curing treatment method is that the muck is placed in an in-situ curing pool (302), a curing agent is prepared by a curing agent preparation device (29) and is conveyed to an in-situ curing machine (301), the curing agent is conveyed into the in-situ curing pool (302) by the in-situ curing machine (301) and is stirred, and the muck is solidified, transported out or recycled;
The sand content limiting value is 50% -70%;
the recycling treatment method comprises the following steps:
S21, mixing the dregs and clear water together to form dregs slurry;
s22, an outlet of the mud decomposing machine (2) is connected with a pre-sieve (3), and a sieve of the pre-sieve (3) is connected with a first storage bin (22) and a second storage bin (23) through a conveying belt;
The undersize of the pre-sieve (3) is connected with a slurry tank (28), the slurry tank (28) is connected with a slurry separation device (4), the screen of a slurry sieve (43) in the slurry separation device (4) is connected with a spiral sand washer (5) through a conveying belt, the screen of the spiral sand washer (5) is connected with a third storage bin (26), the undersize of the spiral sand washer (5) is connected with the slurry separation device (4), the discharge port of the slurry separation device (4) is connected with the feed port of a thickening device (8), the feed port of the thickening device (8) is also connected with a flocculant preparation device (9), the feed port of the thickening device (8) is also connected with the feed port of a curing agent storage tank (10), and the outlet of the curing agent storage tank (12) is also connected with the outlet of the curing agent storage tank (13);
The overflow port of the thickening device (8) is connected with a clean water tank (25);
The mud separating device (4) has the structure that: an inlet of a slurry storage tank (44) is connected with an outlet of a spiral sand washer (5), an inlet of the slurry storage tank (44) is also connected with an outlet of a slurry tank (28), the slurry storage tank (44) is connected with an inlet of a cyclone separation device (41) through a slurry pump (46), a supernatant outlet of the cyclone separation device (41) is connected with an inlet of an overflow tank (42), an overflow plate is arranged in the overflow tank (42), an outlet of the overflow tank (42) before overflow is connected with the slurry storage tank (44), and an outlet of the overflow tank (42) after overflow is connected with a slurry tank (6);
The slag outlet of the cyclone separation device (41) is connected with the inlet of a mud sieve (43), the outlet of the mud sieve (43) is connected with a mud storage tank (44), and a liquid level control device (45) is arranged in the mud storage tank (44);
The slurry is sent into a pre-sieve (3) for pre-separation, sand materials of each layer on the pre-sieve (3) are respectively sent to a second conveying belt (20) and a third conveying belt (21), and particles with different particle diameters are sent to a first storage bin (22) and a second storage bin (23) after sand washing;
The particle with the particle diameter of 3-20mm is conveyed to a first storage bin (22) by a pre-sieve (3), and the particle with the particle diameter of more than 15mm is conveyed to a second storage bin (23) by the pre-sieve (3);
s23, temporarily storing undersize slurry in a slurry tank (28) by a pre-screen (3), and conveying the slurry in the slurry tank (28) to a slurry storage tank (44);
S24, conveying the slurry to a cyclone separation device (41) by a slurry pump (46), conveying the supernatant of the cyclone separation device (41) to an overflow box (42), conveying the lower slurry to a slurry screen (43), conveying the on-screen slag of the slurry screen (43) to a spiral sand washer (5) through a first conveying belt (19), conveying the on-screen particles of the spiral sand washer (5) to a third storage bin (26), and conveying the undersize slurry of the spiral sand washer (5) to a slurry storage pool (44);
The spiral sand washer (5) conveys particles with the diameter of more than 74um to a third storage bin (26);
s25, delivering the slurry overflowed by the overflow box (42) into a slurry tank (6), and returning the slag before overflowing in the overflow box (42) to a slurry storage tank (44);
the slurry pump (46) is an adjustable flow pump, and the flow of the slurry pump (46) is controlled according to the lower slurry flow of the cyclone separation device (41);
The mud in the mud pit (6) is sent into a thickening device (8) to be mixed with flocculant; the mixed thick slurry is sent into a pulping machine (12) to be mixed with a curing agent, and the cured slurry is transported out or recycled;
the overflow liquid of the thickening device (8) is sent into a clean water tank (25) for recycling.
2. The method for comprehensively treating the earth pressure balance shield muck, according to claim 1, is characterized in that: the sand content limit value is 60%.
3. A system for the earth pressure balance shield muck comprehensive treatment method according to any one of claims 1-2, characterized in that:
the outlet of the mud decomposing machine (2) is connected with a pre-sieve (3), and the sieve of the pre-sieve (3) is connected with a first storage bin (22) and a second storage bin (23) through a conveying belt;
The undersize of the pre-sieve (3) is connected with a slurry tank (28), the slurry tank (28) is connected with a slurry separation device (4), the screen of a slurry sieve (43) in the slurry separation device (4) is connected with a spiral sand washer (5) through a conveying belt, the screen of the spiral sand washer (5) is connected with a third storage bin (26), the undersize of the spiral sand washer (5) is connected with the slurry separation device (4), the discharge port of the slurry separation device (4) is connected with the feed port of a thickening device (8), the feed port of the thickening device (8) is also connected with a flocculant preparation device (9), the feed port of the thickening device (8) is also connected with the feed port of a curing agent storage tank (10), and the outlet of the curing agent storage tank (12) is also connected with the outlet of the curing agent storage tank (13);
the overflow port of the thickening device (8) is connected with a clean water tank (25).
4. A system for a method of comprehensively treating earth pressure balance shield muck according to claim 3, wherein: the curing tank (13) is connected with one or more of a foaming material production device (14), a baking-free ceramic material production device (15) and an artificial stone production device (16).
5. The system for the comprehensive treatment of the earth pressure balance shield muck and the ecological resource utilization method according to claim 3, which is characterized in that: in the mud decomposing machine (2), a stirring shaft (201) which is horizontally arranged is arranged, and the stirring shaft (201) is connected with a motor (202);
The device is also provided with a muck temporary storage pool (27), the muck temporary storage pool (27) is provided with a lifting machine (1), an outlet of the lifting machine (1) is positioned above the mud removing machine (2), the upper part of the mud removing machine (2) is also connected with an outlet of a clean water pump (24), and an inlet of the clean water pump (24) is connected with a clean water pool (25);
the pre-screening (3) has multiple stages.
6. The system for comprehensively treating and ecologically utilizing the soil pressure balance shield slag soil according to any one of claims 3-5, which is characterized in that: the structure of the curing agent storage tank (10) is that a weighing screw conveyor (11) is arranged at the bottom of the tank body of the curing agent storage tank (10), and an outlet of the weighing screw conveyor (11) is positioned above the pulping machine (12).
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| CN110695064A (en) * | 2019-11-12 | 2020-01-17 | 青岛恩普环保设备有限公司 | Shield muck zero-discharge treatment system and method |
| CN110902867B (en) * | 2019-12-10 | 2023-11-17 | 三川德青工程机械有限公司 | Pull-type solid-liquid separation system and method for shield tunneling machine |
| CN112138858B (en) * | 2020-08-17 | 2021-07-27 | 中铁南方投资集团有限公司 | Muck resource utilization system |
| CN112757470A (en) * | 2020-12-31 | 2021-05-07 | 中铁工程服务有限公司 | Brick-making recycling method for shield muck |
| CN112692981A (en) * | 2021-01-04 | 2021-04-23 | 武汉二航路桥特种工程有限责任公司 | Preparation system and preparation process of pumpable pouring backfill solidified soil |
| CN114506986B (en) * | 2022-03-18 | 2023-08-15 | 深圳宏业基岩土科技股份有限公司 | In-situ solidification and mixing construction method for waste mud and dregs |
| CN114942316B (en) * | 2022-05-30 | 2024-06-11 | 中铁工程服务有限公司 | Slag soil recycling detection method |
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