Slurry shield mud efficient green zero-discharge construction method

Abstract

The application provides a kind of slurry shield mud high-efficiency green zero-discharge construction method, relating to slurry shield technology field, and the construction method includes slurry bucket groove construction, high-quality mud mixing, slurry separation treatment, new slurry preparation, slurry emergency treatment, by screening treatment to waste mud, solid particles in mud can be separated, treated mud can be recycled, effectively avoiding the generation of waste mud; geotextile tube can handle waste mud when slurry treatment equipment fails or runs overload, when shield machine passes through risk source, ensure continuous tunneling of shield machine and rapid passing, improve the reliability of shield; by adopting assembled bucket groove structure, construction is convenient and material can be reused, avoiding the risk of slurry leakage; the application realizes efficient continuous uninterrupted tunneling of slurry shield in complex environment by combining module bucket groove structure + slurry green treatment process + geotextile tube treatment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of slurry shield, in particular to a slurry shield slurry efficient green zero-emission construction method. BACKGROUND

[0002] In the process of slurry balance shield construction, excellent bentonite slurry is needed to maintain the stability of the excavation surface, thus a large amount of waste slurry is produced. If the waste slurry is not properly treated, not only the resources will be wasted and the cost of shield will be increased, but also the surrounding ecological environment will be endangered. The green and environmentally friendly slurry treatment equipment supporting technology and waste slurry green and environmentally friendly treatment process have become the key factors to ensure green construction and high-speed shield tunneling. SUMMARY

[0003] The present application aims at the above problems, and provides a slurry shield slurry efficient green zero-emission construction method, which comprises the following steps:

[0004] Slurry bucket groove construction: a plurality of arc-shaped plates are spliced respectively, sealing materials are arranged between every two adjacent arc-shaped plates in each group, and a sedimentation tank, a liquid storage tank, a new slurry tank and a preparation tank are obtained;

[0005] High-quality slurry mixing: high-quality slurry is mixed by using environmentally friendly slurry preparation agent, bentonite and water, and the high-quality slurry is transported into a shield machine;

[0006] Slurry separation treatment: waste slurry discharged from the shield machine is screened by a slurry treatment equipment, and first slurry and first particles are obtained, and the first slurry and the first particles are discharged into the sedimentation tank and a residue field respectively; after the first slurry in the sedimentation tank is statically deposited, the upper clear liquid is transported into the preparation tank;

[0007] New slurry preparation: bentonite slurry is prepared and transported into the preparation tank, new slurry is prepared in the preparation tank and transported into the shield machine;

[0008] Slurry emergency treatment: if the slurry treatment equipment fails or operates under overload, or the specific gravity of the waste slurry exceeds a first set value, the waste slurry is transported into a geotextile tube bag, the waste slurry is filtered by the geotextile tube bag, and clear water is obtained and transported into the liquid storage tank.

[0009] According to the technical scheme provided by some embodiments of the present application, the construction method further comprises:

[0010] If the specific gravity of the first slurry in the sedimentation tank exceeds a second set value, the first slurry is concentrated to obtain slurry, clear water, residue soil and mud cake; the slurry and the clear water are transported into the liquid storage tank, and the residue soil and the mud cake are discharged into the residue field.

[0011] According to the technical scheme provided by some embodiments of the present application, the waste mud discharged by the shield machine is screened by the mud treatment equipment, and first mud and first particles are obtained, and the first mud and the first particles are discharged into the sedimentation tank and the residue field respectively, comprising:

[0012] The waste mud is vibrated and screened to obtain primary screening mud and particles with a particle size greater than 2 mm, and the particles with a particle size greater than 2 mm are discharged into the residue field;

[0013] The primary screening mud is centrifuged to obtain the first mud and particles with a particle size of 20 μm-2 mm, and the first mud is conveyed into the sedimentation tank;

[0014] The particles with a particle size of 20 μm-2 mm are dewatered and discharged into the residue field.

[0015] According to the technical scheme provided by some embodiments of the present application, the first mud is concentrated to obtain slurry, clean water, residue soil and mud cake, comprising:

[0016] A flocculating agent is added to the first mud, and after the first mud is stratified, the first mud in the upper layer is centrifuged to obtain the slurry and the residue soil, and the first mud in the lower layer is pressure filtered to obtain clean water and the mud cake.

[0017] According to the technical scheme provided by some embodiments of the present application, the mud treatment equipment comprises:

[0018] A pre-screening device, the liquid inlet of the pre-screening device is connected to the shield machine, and the pre-screening device is used to screen out particles with a particle size greater than 2 mm in the waste mud;

[0019] A slurry storage device, the input end of the slurry storage device is connected to the liquid outlet of the pre-screening device, and the slurry storage device is used to receive and store the mud treated by the pre-screening device;

[0020] A cyclone device, the input end of the cyclone device is connected to the output end of the slurry storage device, and the cyclone device is used to centrifugally separate the mud in the slurry storage device to obtain the first mud and particles with a particle size of 20 μm-2 mm;

[0021] A dewatering device, the input end of the dewatering device is connected to the overflow port of the cyclone device, and the dewatering device is used to dewater the particles with a particle size of 20 μm-2 mm.

[0022] According to the technical scheme provided by some embodiments of the present application, the earthwork pipe bags are arranged in multiple groups, and the multiple groups of earthwork pipe bags are arranged on the drainage layer, and each group of multiple earthwork pipe bags is arranged in a vertical stack.

[0023] According to the technical scheme provided by some embodiments of the present application,

[0024] The slurry storage device comprises a first slurry storage tank and a second slurry storage tank, and the first slurry storage tank is connected to the liquid outlet of the pre-screening device.

[0025] The cyclone device comprises a first cyclone and a second cyclone, the liquid inlet of the first cyclone is connected to the first slurry storage tank through a third slurry pump, the first cyclone is used for separating particles with a particle size of 45 μm-2 mm in the slurry in the first slurry storage tank and discharging the particles from the underflow outlet of the first cyclone, the overflow outlet of the first cyclone is connected to the second slurry storage tank, the liquid inlet of the second cyclone is connected to the second slurry storage tank through a fourth slurry pump, the second cyclone is used for separating particles with a particle size of 20 μm-45 μm in the slurry in the second slurry storage tank and discharging the particles from the underflow outlet of the second cyclone, and the overflow outlet of the second cyclone is connected to the sedimentation tank.

[0026] According to the technical scheme provided by some embodiments of the present application, the dewatering device comprises:

[0027] The first vibrating screen is arranged corresponding to the underflow outlet of the first cyclone, and the first vibrating screen is used for screening out water in the particles discharged from the underflow outlet of the first cyclone.

[0028] The second vibrating screen is arranged corresponding to the underflow outlet of the second cyclone, and the second vibrating screen is used for screening out water in the particles discharged from the underflow outlet of the second cyclone.

[0029] Compared with the prior art, the present application has the beneficial effects: the present application provides a high-efficiency green zero-discharge construction method for slurry shield mud, which comprises slurry bucket groove construction, high-quality mud mixing, slurry separation treatment, new slurry preparation, and slurry emergency treatment. Through screening treatment of the waste slurry generated by the shield machine, the solid particles in the slurry can be separated, the treated slurry can be recycled to prepare new slurry, and the solid particles can be discharged to the residue field after dehydration and can be classified according to particle size for reuse. Through the above operation, the generation of waste slurry can be effectively avoided, not only preventing resource waste, but also saving shield cost. At the same time, the geotextile tube can handle the slurry discharged by the shield machine when the slurry treatment equipment fails or operates under overload, and can ensure the continuous tunneling and rapid passing of the shield machine when the shield machine passes through the risk source, thereby reducing the construction risk and improving the reliability of the shield. Through the use of the assembled bucket groove structure, the construction is convenient and the materials can be reused, and the leakage risk of the traditional slurry pool structure is avoided, realizing green construction. Through the use of the assembled arc-shaped plate to build the sedimentation tank, the liquid storage tank, the new slurry tank, and the preparation tank, and the division of the slurry treatment process into clear functional modules such as "slurry separation", "new slurry preparation", and "emergency treatment", a fine, integrated, and modular slurry treatment system with risk response capability is constructed by using specific combination sequence, hierarchical screening, and directional return path of treated materials. Most slurry shields are used in clay strata, and the slurry specific gravity is large, which may cause pumping failure. At this time, slurry separation treatment can be avoided, and the waste slurry generated by shield tunneling can be directly discharged to the geotextile tube to realize the separation of mud and water by the gravity of mud and the pressure of the slurry itself. The present application realizes the efficient continuous uninterrupted tunneling of the slurry shield in complex environments through the combination of the modular bucket groove structure, the green slurry treatment process, and the geotextile tube treatment.

[0030] It should be understood that the description of technical features, technical solutions, beneficial effects or similar language in the present application does not imply that all features and advantages can be achieved in any single embodiment. On the contrary, it can be understood that the description of a feature or a beneficial effect means that the specific technical feature, technical solution or beneficial effect is included in at least one embodiment. Therefore, the description of technical features, technical solutions or beneficial effects in the specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and beneficial effects described in the embodiments of the present application can be combined in any appropriate manner. Those skilled in the art will understand that the embodiments can be implemented without one or more specific technical features, technical solutions or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects can be identified in specific embodiments that do not embody all embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without any creative effort based on these drawings.

[0032] Figure 1 A flowchart of a slurry shield slurry efficient green zero-discharge construction method provided by the embodiment of the present application;

[0033] Figure 2 A structural diagram of a slurry treatment device and a slurry concentration device in a slurry shield slurry efficient green zero-discharge construction method provided by the embodiment of the present application;

[0034] Figure 3 A structural diagram of an emergency module in a slurry shield slurry efficient green zero-discharge construction method provided by the embodiment of the present application;

[0035] Figure 4 A structural diagram of a geotube stacking in a slurry shield slurry efficient green zero-discharge construction method provided by the embodiment of the present application.

[0036] The text annotations in the figure represent:

[0037] 1, slurry treatment device; 2, slurry concentration device; 3, shield machine; 4, drainage layer; 5, geotube; 6, liquid inlet pipe; 7, liquid outlet pipe; 11, pre-sieving device; 12, first slurry storage tank; 13, second slurry storage tank; 14, first cyclone; 15, second cyclone; 16, first vibrating screen; 17, second vibrating screen; 21, centrifuge; 22, filter press; 31, sedimentation tank; 32, liquid storage tank; 33, new slurry tank; 34, conditioning tank. DETAILED DESCRIPTION

[0038] In order to make those skilled in the art better understand the technical solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the present application. Specifically, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should belong to the protection scope of the present application.

[0039] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatuses.

[0040] It should be noted that a slurry-balanced shield tunneling machine is a tunnel boring machine that uses pressurized slurry (usually a mixture of bentonite and water) to support the excavation face, maintain the stability of the tunnel working face, and simultaneously discharge the excavated soil in fluid form. It injects slurry under certain pressure into a sealed chamber in front of the support ring, so that the slurry forms a mud film on the excavation face to support the soil on the front. Then, the cutterhead installed at the front of the shield cuts the mud film on the surface of the soil. The excavated soil mixes with the working slurry to form a high-density slurry (i.e., waste slurry), which is discharged from the shield machine. Because the waste slurry carries a large number of solid particles, it can easily cause serious harm to the environment and therefore must be properly disposed of.

[0041] Please refer to Figure 1 This is a schematic diagram of a high-efficiency, green, zero-discharge construction method for slurry shield tunneling provided by an embodiment of the present invention. The construction method includes:

[0042] Construction of mud and water tank: Multiple sets of arc-shaped plates are spliced ​​together, and sealing material is placed between two adjacent arc-shaped plates in each set to obtain sedimentation tank, liquid storage tank, new slurry tank and preparation tank;

[0043] Specifically, the sedimentation tank 31, storage tank 32, new slurry tank 33, and preparation tank 34 have the same structure, each including multiple arc-shaped plates connected in sequence, with sealing material between adjacent arc-shaped plates. The sedimentation tank 31, storage tank 32, new slurry tank 33, and preparation tank 34 are all located in the mud tank area. The ground of the mud tank area is hardened with C30 ground as the foundation, and circular steel plates are laid underneath for the tank construction. Each tank is composed of arc-shaped plates, which are connected by expansion bolts. The joints between adjacent arc-shaped plates are treated to prevent water seepage by embedding sealant and rubber gaskets. Multiple sedimentation tanks 31 are located at the top of the mud tank area, and the sedimentation tanks 31 are connected in sequence. The preparation tank 34 is located at the bottom of the mud tank area, and each preparation tank 34 is equipped with a stirrer.

[0044] High-quality mud mixing: High-quality mud is prepared by mixing environmentally friendly mud-making agents, bentonite and water, and then transported into the tunnel boring machine.

[0045] Specifically, during construction, in order to reduce the environmental pollution caused by mud, a new type of biodegradable shield tunneling special slurry agent and bentonite can be used to replace the traditional mud mixing scheme of bentonite, soda ash and CMC, which saves bentonite and also reduces environmental pollution.

[0046] Slurry separation treatment: The waste slurry discharged from the tunnel boring machine is screened and treated by slurry treatment equipment to obtain the first slurry and the first particles. The first slurry and the first particles are discharged to the sedimentation tank and the slag yard respectively. After the first slurry in the sedimentation tank settles, the clear liquid on the top layer is transported to the conditioning tank.

[0047] Specifically, a sludge discharge pipeline connects the sludge treatment equipment 1 and the tunnel boring machine 3. Driven by a sludge discharge pump, the waste sludge enters the sludge treatment equipment 1 through the sludge discharge pipeline for treatment. The sludge treatment equipment 1 can perform multi-stage screening of the waste sludge according to different soil particle diameters, forming large-particle soil and sand and sludge containing small particles, namely the aforementioned first particles and first sludge. The first particles are particles with a diameter of 20μm-300mm, and the first sludge is the waste sludge after removing particles with a diameter of 20μm-300mm. The first output end of the sludge treatment equipment 1 is connected to the inlet of the sedimentation tank 31. The first sludge enters the sedimentation tank 31 through the first output end for sedimentation. The overflow port of the sedimentation tank 31 is connected to the conditioning tank 34, and the clear liquid above the sedimented first sludge enters the conditioning tank 34. The first particles are discharged to the slag yard through the second output end and can be directly transported by a transport vehicle.

[0048] New slurry preparation: Prepare bentonite slurry and transport it to the preparation tank, prepare new slurry in the preparation tank and transport it into the tunnel boring machine;

[0049] Specifically, the storage tank 32 is used to store clean water. The outlet of the storage tank 32 is connected to the new slurry tank 33 and the conditioning tank 34 through the first clean water pump and the second clean water pump, respectively. The new slurry tank 33 is also equipped with a stirrer for preparing bentonite slurry by using bentonite and clean water. The new slurry tank 33 is also connected to the conditioning tank 34 through the first delivery pump. The bentonite slurry is stirred together with clean water and the upper clear liquid after the first mud sedimentation in the conditioning tank 34 to prepare new slurry, and then transported to the tunnel boring machine 3.

[0050] Emergency treatment of mud: If the mud and water treatment equipment malfunctions or is overloaded, or if the specific gravity of the waste mud exceeds the first set value, the waste mud is transported to the geotextile bag, and the waste mud is filtered through the geotextile bag to obtain clean water, which is then transported to the storage tank.

[0051] Furthermore, multiple sets of geotextile bags 5 are provided, and multiple sets of geotextile bags 5 are arranged on the drainage layer 4, with multiple geotextile bags 5 in each set stacked vertically.

[0052] For details, please refer toFigure 3 and Figure 4 When the specific gravity of the waste mud exceeds 1.3 t / m³ 3 When the shield tunneling muck is difficult to remove (i.e., the first set value mentioned above), or the slurry treatment equipment 1 malfunctions and the slurry treatment capacity cannot meet the requirements of the shield tunneling slurry, or when the shield tunneling needs to continue tunneling without stopping when passing through a risk source, the waste slurry generated during shield tunneling can be directly discharged to the geotextile bag 5 area for dehydration and solidification; a drainage layer 4 is formed by laying pebbles, and multiple sets of geotextile bags 5 are laid on the drainage layer 4. Each set of multiple geotextile bags 5 is stacked, with the upper geotextile bag 5 being 2m smaller on each side than the lower geotextile bag 5 to ensure that the bag is filled. The structure is stable; the geotextile tube 5 is connected to the tunnel boring machine 3 through the liquid inlet pipe 6. The liquid inlet pipe 6 is equipped with a gate valve and a distributor to allow multiple geotextile tubes 5 to be filled simultaneously. When the mud generated by the tunnel boring machine is discharged into the geotextile tube 5, the filtration structure formed by the woven form of the geotextile tube 5 and the liquid pressure inside the bag cause the mud to be completely solidified in the geotextile tube 5. The clean water filtered by the geotextile tube 5 is transported to the storage tank 32 through the drain pipe 7 and can be reused without mud leakage. Compared with the traditional dewatering method, it has the advantages of fast dewatering speed, small space occupation, and no secondary pollution.

[0053] By screening the waste slurry generated by the tunnel boring machine (TBM) 3, solid particles can be separated from the slurry. The treated slurry can be recycled to prepare new slurry. The solid particles, after dewatering, are discharged to the slag yard and can be graded according to particle size for reuse. This process effectively avoids the generation of waste slurry, preventing resource waste and saving on tunnel boring machine (TBM) costs. Simultaneously, the geotextile bag 5 can handle the slurry discharged from the TBM 3 when the slurry treatment equipment 1 malfunctions or is overloaded. When the TBM 3 passes through a risk source, it can ensure continuous and rapid tunneling, reducing construction risks and improving efficiency. The reliability of the tunnel boring machine is improved; by adopting a modular tank structure, construction is convenient and materials can be reused, while avoiding the leakage risk of traditional mud pit structures, thus achieving green construction; by using modular arc plates to construct sedimentation tank 31, liquid storage tank 32, fresh mud tank 33, and conditioning tank 34, and dividing the mud treatment process into clear functional modules such as "mud-water separation", "fresh mud conditioning", and "emergency treatment", a refined, integrated, modular mud treatment system with risk response capabilities is constructed by using a specific combination sequence, graded screening, and directional return path of treated materials.

[0054] Furthermore, to address the difficulties in transporting and disposing of construction waste from slurry balance shield tunnels in urban areas, a waste particle size classification and utilization technology is adopted. Large-particle waste can be used for engineering materials; fine-particle waste can be combined with epoxy resin, initiator, silica nano-ions, and other inorganic components to produce a highly concentrated, environmentally friendly, and high-strength curing agent. It can also be applied to the self-compacting backfilling technology of fluidized solidified soil foundation trenches, or to the manufacture of non-fired paving bricks, thereby realizing the resource utilization of construction waste from slurry balance shield tunnels.

[0055] In a preferred embodiment, the construction method further includes:

[0056] If the specific gravity of the first slurry in the sedimentation tank 31 exceeds the second set value, the first slurry is concentrated to obtain slurry, clear water, slag and mud cake; the slurry and clear water are transported to the storage tank 32, and the slag and mud cake are discharged to the slag yard.

[0057] Specifically, when the specific gravity of the first slurry in sedimentation tank 31 exceeds 1.2 t / m³ 3 When the second set value is reached (i.e., the above-mentioned second set value), the first mud in the sedimentation tank 31 is concentrated by the mud-water thickening device 2. The clear water and slurry obtained after the treatment are transported to the storage tank 32 for the preparation of new slurry, and the resulting slag and mud cake are discharged to the slag yard.

[0058] Furthermore, the mud-water thickening equipment 2 includes a centrifuge 21 and a filter press 22. The inlet of the centrifuge 21 is connected to the sedimentation tank 31 through a first slurry pump for centrifugal separation of the first mud to obtain slurry and slag. The inlet of the filter press 22 is connected to the sedimentation tank 31 through a second slurry pump for filter pressing of the first mud to obtain clear water and mud cake.

[0059] Specifically, as the number of tunneling rings increases, the specific gravity and viscosity of the first slurry in the settling tank 31 will increase. When the specific gravity or viscosity of the first slurry does not meet the construction requirements, a centrifuge 21 and a filter press 22 are used for further treatment. A mobile slurry pump is installed in the settling tank 31. When the specific gravity of the first slurry in the settling tank 31 exceeds 1.2 t / m 3When the viscosity exceeds 24s, the first slurry is pumped to the storage tank of the slurry thickening device 2 using a mobile slurry pump. Then, a flocculant (polyacrylamide (PAM)) at a ratio of 3-5‰ is added to the storage tank and thoroughly stirred. After the flocculant settles, the first slurry in the storage tank separates into layers. The upper layer of slurry with a lower specific gravity is processed by centrifuge 21, while the lower layer of slurry with a higher specific gravity is processed by filter press 22. To improve the processing efficiency of centrifuge 21 and filter press 22, different methods are needed to adjust the viscosity, pH value, and other indicators of the first slurry according to different situations. The slurry viscosity has a significant impact on the tunnel boring speed and slurry treatment. The conventional method is to add water to dilute the slurry with higher viscosity. When there are many clay particles in the slurry and they are finely dispersed, calcium can be added. Dilute with lime-tannin alkali solution or fresh slurry and water (provided the water loss is permissible); when high temperature causes viscosity to increase, a high-temperature diluent (such as iron-chromium salts) can be added; when the slurry specific gravity is high and causes viscosity to increase, sodium tannate can be added; when the pH value of the slurry is controlled within a suitable range, the slurry shear stress is low, the water loss is low, and the performance is relatively stable. At the same time, the pH value has a significant flocculation effect on the slurry, so controlling the pH value is very important for slurry treatment. When the pH value is too high, tannic acid, tannin powder, or lignite powder can be added; when too much tannic acid causes the slurry pH value to decrease, a high-alkali ratio coal alkali solution can be added; when the slurry viscosity is high, caustic soda solution or a high-alkali ratio sodium tannate can be added; when the slurry water loss is high, a small amount of CMC can be added.

[0060] The slurry with a lower specific gravity at the top is pumped into centrifuge 21 by the first slurry pump. When the pusher of centrifuge 21 rotates, the slurry with a lower specific gravity is dispersed into the drum from the feed port. The coarse particles in the slurry settle on the inner surface of the drum. The blades of the pusher rotate continuously, pushing the slag formed by the particles toward the solid material outlet. The drum generates high centrifugal force, causing the slurry to form a slurry pool inside the drum. The free liquid and finer particles flow to the other end of centrifuge 21 and are discharged as slurry through the overflow weir. Particles with a diameter of 5µm or more in the slurry are separated and fall into the slag yard. Its moisture content is less than 40%, and it can be directly loaded onto trucks for slag discharge. The separated slurry is transported to the mixing tank 34 for remixing new slurry.

[0061] The heavier slurry at the bottom is pumped into the storage tank of the filter press 22 by the second slurry pump. After being stirred in the storage tank, it enters the filter chamber of the filter press 22. The solids in the slurry are intercepted by the filter cloth and particles, and the liquid is discharged. Then, the diaphragm pressing is carried out to reduce the moisture content. The filtered solids form a mud cake with a moisture content of less than 25%, which can also be directly loaded onto trucks for slag discharge. The separated clear water is transported to the conditioning tank 34 for remixing new slurry.

[0062] Furthermore, the storage tank 32 includes a clear water tank and a centrifuge feeding tank. The clear water tank is used to store clear water, and the centrifuge feeding tank is used to store the slurry produced by the centrifuge 21. The new slurry tank 33 is used to store sewage during the initial shield tunneling and is used to mix bentonite slurry after the shield tunneling begins. The conditioning tank 34 serves as a mud conditioning zone, used to neutralize the bentonite slurry and the slurry produced by the centrifuge 21 to make new slurry, which is then transported into the shield machine 3. A storage tank and a chemical dosing tank are also provided. The storage tank is used to store bentonite. The bentonite and the clear water in the clear water tank enter the new slurry tank 33 together and are stirred to form bentonite slurry. The chemical dosing tank is used to add a regulator to neutralize the slurry produced by the centrifuge 21.

[0063] In a preferred embodiment, the mud and water treatment device 1 includes:

[0064] The pre-screening device 11 has its inlet connected to the tunnel boring machine 3. The pre-screening device 11 is used to screen out particles with a diameter greater than 2 mm in the waste mud.

[0065] The slurry storage device has its input end connected to the outlet of the pre-screening device 11. The slurry storage device is used to receive and store the slurry processed by the pre-screening device 11.

[0066] The cyclone device has its input end connected to the output end of the slurry storage device. The cyclone device is used to centrifuge the slurry in the slurry storage device to obtain the first slurry and particles with a particle size of 20μm-2mm.

[0067] The dewatering device has its input end connected to the overflow port of the cyclone device and is used to dewater particles with a particle size of 20μm-2mm.

[0068] Furthermore,

[0069] The slurry storage device includes a first slurry storage tank 12 and a second slurry storage tank 13. The first slurry storage tank 12 is connected to the outlet of the pre-screening device 11.

[0070] The hydrocyclone device includes a first hydrocyclone 14 and a second hydrocyclone 15. The inlet of the first hydrocyclone 14 is connected to the first slurry storage tank 12 via a third slurry pump. The first hydrocyclone 14 is used to separate particles with a diameter of 45μm-2mm in the slurry in the first slurry storage tank 12 and discharge them through the underflow port of the first hydrocyclone 14. The overflow port of the first hydrocyclone 14 is connected to the second slurry storage tank 13. The inlet of the second hydrocyclone 15 is connected to the second slurry storage tank 13 via a fourth slurry pump. The second hydrocyclone 15 is used to separate particles with a diameter of 20μm-45μm in the slurry in the second slurry storage tank 13 and discharge them through the underflow port of the second hydrocyclone 15. The overflow port of the second hydrocyclone 15 is connected to the sedimentation tank 31.

[0071] For details, please refer to Figure 2The sludge treatment equipment 1 is installed on a sludge treatment platform, which is a three-layer steel structure. Multiple first hydrocyclones 14 and multiple second hydrocyclones 15 are integrated and installed on the top layer. A pre-screening device 11 and a dewatering device are installed on the middle layer, with the dewatering device located below the first hydrocyclones 14 and multiple second hydrocyclones 15. A first slurry storage tank 12 and a second slurry storage tank 13 are installed on the bottom layer, with the first slurry storage tank 12 located below the pre-screening device 11 and the second slurry storage tank 13 located below the dewatering device. The waste sludge discharged from the tunnel boring machine 3... Driven by the slurry pump, the slurry first enters the buffer tank for decompression through the sludge discharge pipeline, and then enters the pre-screening device 11. After the waste slurry is vibrated and screened, particles with a diameter of 2mm or larger are screened out and placed in the slag yard. The moisture content of the particles after vibrating screening is less than 25%, and they can be directly transported by vehicle. The screened waste slurry enters the first slurry storage tank 12. The screen size of the pre-screening device 11 can be selected according to the particle content of the stratum. The geological conditions of the tunnel boring machine 3 excavation section are detected to clarify the slag composition of the tunnel boring stratum. Then, based on the size of the slag particles to be screened, select the appropriate screen mesh size, wire diameter, aperture, diameter, material, and effective screen surface, etc., to meet the screening requirements. The slurry in the first storage tank 12 enters the first hydrocyclone 14 under the drive of the third slurry pump. The first hydrocyclone 14 separates the waste slurry and particles with a diameter of 45μm-2mm through centrifugal action. The waste slurry flows from the overflow port of the first hydrocyclone 14 into the second storage tank 13, while the particles with a diameter of 45μm-2mm flow from the underflow port of the first hydrocyclone 14 into the dewatering device. The slurry is dewatered and then discharged to the slag yard, with a moisture content of less than 25%. The slurry in the second storage tank 13 is driven by the fourth slurry pump into the second hydrocyclone 15. The second hydrocyclone 15 separates the waste slurry and particles with a particle size of 20μm-45μm. After separation, the first slurry enters the sedimentation tank 31 through the overflow port of the second hydrocyclone 15, while the particles with a particle size of 45μm-2mm enter the dewatering device through the underflow port of the second hydrocyclone 15 for dewatering treatment and then discharged to the slag yard, with a moisture content of less than 25%.

[0072] Furthermore, the dehydration device includes:

[0073] The first vibrating screen 16 is set to correspond to the underflow port of the first hydrocyclone 14. The first vibrating screen 16 is used to screen out the moisture in the particles discharged from the underflow port of the first hydrocyclone 14.

[0074] The second vibrating screen 17 is set to correspond to the underflow port of the second hydrocyclone 15. The second vibrating screen 17 is used to screen out the moisture in the particles discharged from the underflow port of the second hydrocyclone 15.

[0075] Specifically, the first vibrating screen 16 and the second vibrating screen 17 are both set at the bottom of the mud and water treatment platform. The first vibrating screen 16 is set with multiple first hydrocyclones 14, and the second vibrating screen 17 is set with multiple second hydrocyclones 15. The first vibrating screen 16 and the second vibrating screen 17 can process particles with a diameter of 20µm or more, which are used to dewater the particles and discharge them to the slag yard so that they meet the standard for direct transportation.

[0076] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A slurry shield mud high-efficiency green zero-discharge construction method, characterized in that, The application relates to a construction method of a shield tunneling machine, which comprises the following steps: Mud bucket groove construction: C30 concrete is used to pour the foundation in the mud bucket groove area, circular steel plates are laid in the lower part, a bucket groove is erected, a plurality of arc-shaped plates are spliced, expansion bolts are used to connect the arc-shaped plates, sealing glue and rubber gaskets are embedded between every two adjacent arc-shaped plates, and a sedimentation tank, a liquid storage tank, a new slurry tank and a preparation tank are obtained; High-quality mud mixing: environment-friendly mud preparation agents, bentonite and water are used to mix high-quality mud, and the high-quality mud is transported into a shield machine; Mud-water separation treatment: waste mud discharged from the shield machine is screened by a mud-water treatment device, first mud and first particles are obtained, and the first mud and the first particles are discharged into the sedimentation tank and a residue field respectively; after the first mud in the sedimentation tank is statically deposited, the upper clear liquid is transported into the preparation tank; New slurry preparation: bentonite slurry is prepared and transported into the preparation tank, new slurry is prepared in the preparation tank and transported into the shield machine; Mud emergency treatment: if the mud-water treatment device fails or operates under overload, or the specific gravity of the waste mud exceeds a first set value, the waste mud is transported into a geotube, the waste mud is filtered by the geotube, clear water is obtained and transported into the liquid storage tank; the geotube is provided with a plurality of groups, the plurality of groups of geotubes are arranged on a drainage layer, and each group of geotubes is arranged in a vertical direction; the upper geotube in each group of geotubes is smaller than the lower geotube by 2m on each side, so that the filled bag body is stable.

2. The slurry shield mud efficient green zero-discharge construction method according to claim 1, characterized in that, The construction method further comprises: If the specific gravity of the first mud in the sedimentation tank exceeds a second set value, the first mud is concentrated to obtain slurry, clear water, residue and mud cake; the slurry and the clear water are transported into the liquid storage tank, and the residue and the mud cake are discharged into the residue field.

3. The method according to claim 1, characterized in that, The mud-water treatment device screens the waste mud discharged from the shield machine, obtains first mud and first particles, and discharges the first mud and the first particles into the sedimentation tank and the residue field respectively, and the method comprises the following steps: The waste mud is vibrated and screened to obtain primary screening mud and particles with a particle size greater than 2mm, and the particles with a particle size greater than 2mm are discharged into the residue field; The primary screening mud is centrifuged to obtain the first mud and particles with a particle size of 20-2000 microns, and the first mud is transported into the sedimentation tank; The particles with a particle size of 20-2000 microns are dewatered and discharged into the residue field.

4. The slurry shield mud high-efficiency green zero-discharge construction method according to claim 2, characterized in that, The first mud is concentrated to obtain slurry, clear water, residue and mud cake, and the method comprises the following steps: A flocculating agent is added to the first mud, the first mud is layered, the upper first mud is centrifuged to obtain the slurry and the residue, and the lower first mud is pressure-filtered to obtain clear water and the mud cake.

5. The slurry shield mud high-efficiency green zero-discharge construction method according to claim 1, characterized in that, The mud-water treatment device (1) comprises: A pre-screening device (11) is connected to the shield tunneling machine (3) and used to screen out particles with a size greater than 2 mm in the waste mud; A mud storage device is connected to the outlet of the pre-screening device (11) and used to receive and store the mud treated by the pre-screening device (11); A cyclone device is connected to the output of the mud storage device and used to centrifugally separate the mud in the mud storage device to obtain the first mud and particles with a size of 20 μm-2 mm; A dewatering device is connected to the overflow of the cyclone device and used to dewater the particles with a size of 20 μm-2 mm.

6. The mud water shield tunneling mud efficient green zero discharge construction method according to claim 5, characterized in that, The mud storage device includes a first mud storage tank (12) and a second mud storage tank (13), and the first mud storage tank (12) is connected to the outlet of the pre-screening device (11); The cyclone device includes a first cyclone (14) and a second cyclone (15), the inlet of the first cyclone (14) is connected to the first mud storage tank (12) through a third slurry pump, the first cyclone (14) is used to separate particles with a size of 45 μm-2 mm in the mud in the first mud storage tank (12) and discharge them through the underflow outlet of the first cyclone (14), the overflow outlet of the first cyclone (14) is connected to the second mud storage tank (13), the inlet of the second cyclone (15) is connected to the second mud storage tank (13) through a fourth slurry pump, and the second cyclone (15) is used to separate particles with a size of 20 μm-45 μm in the mud in the second mud storage tank (13) and discharge them through the underflow outlet of the second cyclone (15), and the overflow outlet of the second cyclone (15) is connected to the sedimentation tank (31).

7. The slurry shield mud high-efficiency green zero-discharge construction method according to claim 6, characterized in that, The dewatering device includes: A first vibrating screen (16) is arranged corresponding to the underflow outlet of the first cyclone (14), and the first vibrating screen (16) is used to screen out water in the particles discharged through the underflow outlet of the first cyclone (14); A second vibrating screen (17) is arranged corresponding to the underflow outlet of the second cyclone (15), and the second vibrating screen (17) is used to screen out water in the particles discharged through the underflow outlet of the second cyclone (15).

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