System and method for rapid dehydration treatment and recycling of shield slurry

Abstract

The invention discloses a system and method for rapid dehydration treatment and recycling of shield slurry, and relates to the technical field of slurry treatment.The method comprises the steps that a slurry pond, a stirring pond, a storage pond and the like are arranged on a shield construction site, the slurry is dewatered and changed into muck through the steps of pumping water through a slurry pump, adding a gel breaker, stirring and the like, and then the muck is transported to a stacking yard to be fermented; and treating by a mud-stone separator, a screening device and the like, mixing with aggregate, adding a medicament, and stirring to form a consolidated material. According to the system and the method, the water content of the slurry can be quickly reduced, pathogenic bacteria and peculiar smell can be effectively removed, refined dehydration and efficient resource utilization are realized, the transportation cost can be reduced, a site can be reasonably utilized, and the shield slurry treatment and resource requirements in projects such as subway construction and the like can be well met.

Description

Technical Field

[0001] The invention relates to the technical field of mud treatment, and in particular to a system and method for rapid dehydration treatment and resource utilization of shield mud. Background Art

[0002] With the rapid development of urban construction, subway construction is widely carried out in major cities. During the construction of subways, a large amount of shield mud will be generated. The treatment of shield mud has become an important issue that needs to be solved urgently, and it faces many difficulties.

[0003] On the one hand, the characteristics of shield mud make it difficult to handle. The water content of shield mud is extremely high, up to 80%, and it is in a fluid state. This high water content and fluidity make its transportation cost high. Usually, mud trucks are used to transport the mud and water together, which increases the transportation burden.

[0004] On the other hand, the existing mud treatment methods have many disadvantages. In the early stage of mud treatment, the key is to quickly dehydrate, but due to the limited work site, the mud produced on the day is generally required to be promptly treated and transported to the designated yard within 24 hours. At present, the conventional treatment method is to set up a yard outside the construction site, first pour the mud into the mud storage tank by the mud truck for sedimentation and dehydration, and then further dehydrate it by digging out and piling it up for drying after draining the surface water. After a long period of natural dehydration, the moisture content can be reduced to a certain extent for backfilling; or a belt filter press is set up in the yard, and the mud can produce mud cake after filtration, reducing the moisture content to about 50%, and further treatment can reduce it to about 40% for backfilling. However, these conventional treatment methods have serious problems. After adding agents during shield and filtration, the treated slag will form foam soil, which is difficult to dry and compact, and the pathogens and odors in the slag are not effectively treated, which brings great obstacles to the subsequent resource utilization and makes it difficult to achieve real resource utilization.

[0005] In addition, the key issues of shield mud treatment are also reflected in the rapid dehydration and resource utilization of the construction site. At the construction site, if the fluid mud cannot be quickly transformed into solid slag and transported out by truck in time, it will be impossible to absorb the large amount of mud produced due to the long processing time if it is only treated by the yard. Moreover, in the resource utilization link, the shield mud treated with flocculants will form bubble soil (also called slope repair soil at the construction site), which has the characteristics of forming fine cell structures in the soil and is not easy to dry and compact. This has become a bottleneck for subsequent resource utilization. At the same time, the pathogens and odors carried by the bubble soil will also have an adverse effect on the surrounding environment.

[0006] In summary, the existing shield mud treatment technology has many shortcomings in rapid dehydration and resource utilization, and it is difficult to meet the needs of efficient treatment and resource utilization of large amounts of shield mud in projects such as subway construction. Summary of the invention

[0007] The purpose of the present invention is to provide a system and method for rapid dehydration and resource utilization of shield mud, so as to solve the problems existing in the above-mentioned prior art and improve the efficiency of dehydration and resource utilization of shield mud.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The present invention provides a system for rapid dehydration treatment and resource utilization of shield mud, comprising:

[0010] The mud pool, mixing pool and storage pool are set up in sequence at the shield construction site;

[0011] A mud pump, the mud pump is used to pump out surface water of the mud in the mud pool;

[0012] A storage yard, a mud-rock separator, a first belt conveyor, a screening device, a second belt conveyor, a batching machine, a lifting device and a mixer are sequentially arranged outside the shield construction site, wherein the first belt conveyor is used to transport the slag separated by the mud separator to the screening device, the second belt conveyor is used to transport the slag that meets the requirements screened by the screening device to the batching machine, and the lifting device is used to transport the output of the batching machine to the mixer;

[0013] A reagent tank is arranged outside the shield construction site, and the discharge port of the reagent tank is communicated with the feed port of the mixer.

[0014] Preferably, the screening device adopts a drum screen.

[0015] Preferably, the lifting device is a bucket elevator.

[0016] Preferably, the mud tank and the storage tank are respectively adjacent to the stirring tank.

[0017] Preferably, the diameter of the mesh of the drum screen is 5 mm.

[0018] The present invention also provides a method for rapid dehydration and resource utilization of shield mud. Based on the above-mentioned system for rapid dehydration and resource utilization of shield mud, the method comprises the following steps:

[0019] S1, placing the shield mud into the mud pool, and using the mud pump to pump out the surface water of the shield mud in the mud pool to dewater the shield mud in the mud pool;

[0020] S2, using an excavator to transport the shield mud after precipitation in the mud pool to the mixing pool, then adding a gel breaker into the mixing pool, and stirring the shield mud and the gel breaker in the mixing pool, so that the shield mud in the mixing pool becomes slag;

[0021] S3, using an excavator to transport the slag in the mixing tank to the storage tank;

[0022] S4, using a truck to transport the slag in the storage pool to the storage yard, and mixing the slag in the storage yard with a microbial agent and a sterilizing and deodorizing agent, piling them up, and then leaving them for 7 days for fermentation;

[0023] S5, using a forklift to place the fermented slag in the storage yard into the mud-stone separator, separating the sand and gravel with a particle size greater than 50 mm from the slag, and stacking them separately;

[0024] S6, using the first belt conveyor to convey the slag separated by the mud-stone separator to the screening device, using the screening device to separate the sand and gravel with a particle size greater than 5 mm, and stacking them separately;

[0025] S7, conveying the slag screened by the screening device to the batching machine through the second belt conveyor, and mixing the slag in the batching machine with aggregate to form the required raw materials according to the requirements of resource utilization;

[0026] S8, using the lifting device to transport the raw materials formed in the batching machine into the mixer;

[0027] S9, conveying the required reagents into the mixer through the reagent tank, and then utilizing the mixer to stir and mix the raw materials and the required reagents to form a solidified material.

[0028] Preferably, the surface water extracted in step S1 is clarified and then recycled.

[0029] Preferably, in step S7, the ratio of the slag to the aggregate in the batching machine is determined according to the type of the raw materials required to be obtained.

[0030] Preferably, the type of the required agent is determined according to the type of the solidification material to be obtained.

[0031] Preferably, in step S9, the ratio of the raw material to the required agent in the mixer is determined according to the type of the solidifying material to be obtained.

[0032] Compared with the prior art, the present invention has achieved the following technical effects:

[0033] The system and method for rapid shield mud dehydration and resource utilization of the present invention improve the efficiency of shield mud dehydration and resource utilization.

[0034] Furthermore, the present invention sets up facilities such as a mud pool, a mixing pool and a storage pool at the shield construction site, and first extracts the surface water of the mud in the mud pool through a mud pump, thereby realizing a preliminary precipitation operation, which can quickly reduce the water content of the mud. Compared with the existing conventional treatment methods that simply rely on natural sedimentation or belt filter presses, which may take a long time to achieve a certain dehydration effect, the dehydration process is effectively accelerated in the early stage of treatment.

[0035] Furthermore, adding a degumming agent into the mixing tank and stirring the mud to turn it into slag further changes the state of the mud from a fluid state to a more easily handled solid slag form, which is more beneficial for subsequent transportation, stacking and further dehydration operations. Compared with traditional treatment methods, it is more efficient and direct in achieving mud solidification.

[0036] Furthermore, in the subsequent processing process outside the shield construction site, equipment such as mud and stone separators and screening devices (such as drum screens) are set up. Through multi-stage screening operations, such as first separating sand and stone with a particle size greater than 50 mm in the mud and stone separator, and then separating sand and stone with a particle size greater than 5 mm through the screening device, the larger particles of sand and stone in the slag are gradually removed, making the composition of the slag more uniform.

[0037] Furthermore, in the dumping yard, the slag is mixed with microbial agents and sterilization and deodorization agents and fermented for 7 days. This operation can effectively deal with adverse factors such as pathogens and odors carried in the slag. Compared with the existing treatment methods, the treated slag still has pathogens and odors that are not effectively treated, thus hindering resource utilization. The present invention greatly improves the feasibility of subsequent resource utilization of the slag.

[0038] Furthermore, by subsequently mixing the screened slag with aggregate to form raw materials, and then mixing it with the required agents in a mixer to form a consolidation material, the treated slag can be processed into materials that meet specific needs according to the requirements of resource utilization, thereby realizing the transformation from the originally difficult-to-use shield mud to the consolidation material with certain engineering application value, and effectively expanding the ways to utilize shield mud as a resource.

[0039] Furthermore, the entire processing system and method of the present invention can more efficiently convert shield mud into resource-usable materials, avoiding the waste of a large amount of shield mud that cannot be truly recycled due to the formation of difficult-to-handle situations such as foam soil under traditional treatment methods, thereby improving the utilization efficiency of shield mud resources in projects such as subway construction and better meeting the project's demand for resource recycling.

[0040] Furthermore, by preliminarily dewatering and solidifying the mud at the construction site, the amount of debris transported to the storage yard is greatly reduced compared to the traditional method of transporting both mud and water, thereby reducing transportation costs and also alleviating the transportation burden, because the transportation of fluid mud is relatively difficult, while the transportation of solid debris is more convenient.

[0041] Furthermore, in the subsequent processing process, after multi-stage screening and other operations, the further separated sand and gravel can be piled up separately, which also makes the transportation and subsequent processing of various materials more orderly, avoiding the inconvenience and additional costs that may be caused by mixed transportation and processing.

[0042] Furthermore, the present invention reasonably sets up facilities such as mud pools, mixing pools and storage pools at the shield construction site, fully utilizing the space on the construction site for early mud treatment operations, and avoiding the problem of insufficient site utilization in existing treatment methods due to complete reliance on storage yards outside the construction site.

[0043] The setting up of the storage yard and subsequent processing equipment outside the construction site is also relatively orderly. The slag is gradually processed through different equipment, making the utilization of the entire site more reasonable and efficient, improving the site's processing capacity, and being able to better cope with the large amount of shield mud processing needs in projects such as subway construction.

[0044] Furthermore, the system and method for rapid dehydration and resource utilization of shield mud of the present invention have achieved good technical effects in dehydration, resource utilization, transportation and site utilization, effectively solving many shortcomings of existing shield mud treatment technology, and can better meet the needs of efficient treatment and resource utilization of large amounts of shield mud in projects such as subway construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a structural schematic diagram of the system for rapid dehydration treatment and resource utilization of shield mud of the present invention;

[0047] Figure 2 A flow chart of the method for rapid dehydration and resource utilization of shield mud of the present invention;

[0048] In the figure: 1. Mud pool; 2. Mixing pool; 3. Storage pool; 4. Stacking yard; 5. Mud and rock separator; 6. First belt conveyor; 7. Screening device; 8. Second belt conveyor; 9. Batching machine; 10. Lifting device; 11. Mixer; 12. Chemical tank. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The purpose of the present invention is to provide a system and method for rapid dehydration and resource utilization of shield mud, so as to solve the problems existing in the above-mentioned prior art and improve the efficiency of dehydration and resource utilization of shield mud.

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0052] Embodiment 1

[0053] like Figure 1 As shown, this embodiment provides a system for rapid dehydration and resource utilization of shield mud, including:

[0054] The mud pool 1, the mixing pool 2 and the storage pool 3 are sequentially arranged at the shield construction site;

[0055] A mud pump, the mud pump is used to pump out surface water of the mud in the mud pool 1;

[0056] A storage yard 4, a mud-rock separator 5, a first belt conveyor 6, a screening device 7, a second belt conveyor 8, a batching machine 9, a lifting device 10 and a mixer 11 are sequentially arranged outside the shield construction site. The first belt conveyor 6 is used to transport the slag separated by the mud separator to the screening device 7, the second belt conveyor 8 is used to transport the slag that meets the requirements screened by the screening device 7 to the batching machine 9, and the lifting device 10 is used to transport the discharge of the batching machine 9 to the mixer 11;

[0057] The reagent tank 12 is arranged outside the shield construction site, and the discharge port of the reagent tank 12 is communicated with the feed port of the mixer 11 .

[0058] In the optional scheme of this embodiment, it is more preferred that the screening device 7 adopts a drum screen, and the aperture of the screen hole of the drum screen is 5 mm. The lifting device 10 adopts a bucket elevator. The mud pool 1 and the storage pool 3 are respectively adjacent to the stirring pool 2.

[0059] This embodiment reasonably sets up facilities such as mud pool 1, mixing pool 2 and storage pool 3 at the shield construction site, fully utilizing the space of the construction site for early mud treatment operations, and avoiding the problem of insufficient site utilization in existing treatment methods due to full reliance on storage yards outside the construction site.

[0060] The setting up of the storage yard 4 and subsequent processing equipment outside the construction site is also relatively orderly. The slag is gradually processed through different equipment, making the utilization of the entire site more reasonable and efficient, improving the site's processing capacity, and being able to better cope with the processing needs of large amounts of shield mud in projects such as subway construction.

[0061] Embodiment 2

[0062] like Figure 2 As shown, this embodiment provides a method for rapid dehydration and resource utilization of shield mud. Based on the above-mentioned system for rapid dehydration and resource utilization of shield mud, the method includes the following steps:

[0063] S1, placing the shield mud into the mud pool 1, and using a mud pump to pump out the surface water of the shield mud in the mud pool 1 to dewater the shield mud in the mud pool 1;

[0064] S2, using an excavator to transport the shield mud after precipitation in the mud pool 1 to the mixing pool 2, then adding a gel breaker to the mixing pool 2, and stirring the shield mud and the gel breaker in the mixing pool 2, so that the shield mud in the mixing pool 2 becomes slag;

[0065] S3, using an excavator to transport the slag in the mixing tank 2 to the storage tank 3;

[0066] S4, using a truck to transport the slag in the storage pool 3 to the storage yard 4, and mix the slag in the storage yard 4 with the microbial agent and the sterilizing and deodorizing agent, pile them up, and then leave them for 7 days for fermentation;

[0067] S5, using a forklift to place the fermented slag in the storage yard 4 into a mud-stone separator 5, separating the sand and gravel with a particle size greater than 50 mm from the slag, and stacking them separately;

[0068] S6, using the first belt conveyor 6 to convey the slag separated by the mud-stone separator 5 to the screening device 7, using the screening device 7 to separate the sand and gravel with a particle size greater than 5 mm, and pile them up separately;

[0069] S7, conveying the slag screened by the screening device 7 to the batching machine 9 through the second belt conveyor 8, and mixing the slag in the batching machine 9 with aggregate to form the required raw materials according to the requirements of resource utilization;

[0070] S8, using the lifting device 10 to transport the raw materials formed by the batching machine 9 to the mixer 11;

[0071] S9. The required reagents are transported to the mixer 11 through the reagent tank 12, and then the mixer 11 is used to stir and mix the raw materials and the required reagents to form a solidified material.

[0072] In the optional scheme of this embodiment, it is more preferred to clarify the surface water extracted in step S1 and then recycle it.

[0073] In this embodiment: in step S7, the ratio of slag to aggregate in the batching machine is determined according to the type of raw materials to be obtained; the type of required reagent is determined according to the type of consolidation material to be obtained; in step S9, the ratio of the raw materials in the mixer to the required reagent is determined according to the type of consolidation material to be obtained.

[0074] It is worth noting that the slag screened out by the screening device 7 is mixed with aggregate (generally referring to sand and gravel) and then added with cementitious materials to be used to make backfill soil, roadbed soil, water-stabilized soil or as a raw material for unfired bricks, but the consolidation material in this embodiment can be but is not limited to backfill soil, roadbed soil, water-stabilized soil and as a raw material for unfired bricks.

[0075] This embodiment sets up facilities such as a mud pool 1, a mixing pool 2 and a storage pool 3 at the shield construction site, and first extracts the surface water of the mud in the mud pool 1 through a mud pump, realizing a preliminary precipitation operation, which can quickly reduce the water content of the mud. Compared with the existing conventional treatment methods that simply rely on natural sedimentation or belt filter presses, which may take a long time to achieve a certain dehydration effect, the dehydration process is effectively accelerated in the early stage of treatment. Adding a gel breaker to the mixing pool 2 and stirring to turn the mud into slag further changes the state of the mud, changing it from a fluid state to a more easily handled solid slag form, which is more beneficial for subsequent transportation, stacking and further dehydration treatment operations, and is more efficient and direct in achieving mud solidification than traditional treatment methods.

[0076] In the subsequent processing process outside the shield construction site, equipment such as a mud and stone separator 5 and a screening device 7 (such as a drum screen) are set up. Through multi-stage screening operations, such as first separating sand and stone with a particle size greater than 50 mm in the mud and stone separator 5, and then separating sand and stone with a particle size greater than 5 mm through the screening device 7, the larger particles of sand and stone in the slag are gradually removed, so that the composition of the slag is more uniform. In the storage yard 4, the slag is mixed with microbial agents and sterilizing and deodorizing agents and fermented for 7 days. This operation can effectively deal with pathogens and odors carried in the slag. Compared with the existing treatment method, the slag after treatment has pathogens and odors that are not effectively treated, thereby hindering resource utilization. This embodiment greatly improves the feasibility of subsequent resource utilization of the slag. By subsequently mixing the screened slag with aggregate to form raw materials, and mixing it with the required agents in the mixer 11 to form a consolidation material, the treated slag can be processed into materials that meet specific needs according to the requirements of resource utilization, thereby realizing the transformation from the originally difficult-to-use shield mud to the consolidation material with certain engineering application value, and effectively expanding the ways of resource utilization of shield mud.

[0077] The entire processing system and method of this embodiment can more efficiently convert shield mud into resource-usable materials, avoiding the waste of a large amount of shield mud that cannot be truly recycled due to the formation of difficult-to-handle situations such as foam soil under traditional treatment methods, improving the utilization efficiency of shield mud resources in projects such as subway construction, and better meeting the project's demand for resource recycling.

[0078] By preliminarily dewatering and solidifying the mud at the construction site, the amount of slag transported to the storage yard 4 is greatly reduced compared to the traditional method of transporting mud and water, which reduces the transportation cost and also reduces the transportation burden, because the transportation of fluid mud is relatively difficult, while the transportation of solid slag is more convenient. Tests have shown that this embodiment can convert shield mud with a water content of 80% into slag with a tax aluminum content of 20%. After deducting the cost of chemicals and human, mechanical and electrical equipment, it can still bring in rich income, and there is also an income from the resource treatment of slag.

[0079] In the subsequent processing process, after multi-stage screening and other operations, the further separated sand and gravel can be piled up separately, which also makes the transportation and subsequent processing of various materials more orderly, avoiding the inconvenience and additional costs that may be caused by mixed transportation and processing.

[0080] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A system for rapid dehydration and resource utilization of shield mud, characterized in that: include: The mud pool, mixing pool and storage pool are set up in sequence at the shield construction site; A mud pump, the mud pump is used to pump out surface water of the mud in the mud pool; A storage yard, a mud-rock separator, a first belt conveyor, a screening device, a second belt conveyor, a batching machine, a lifting device and a mixer are sequentially arranged outside the shield construction site, wherein the first belt conveyor is used to transport the slag separated by the mud separator to the screening device, the second belt conveyor is used to transport the slag that meets the requirements screened by the screening device to the batching machine, and the lifting device is used to transport the output of the batching machine to the mixer; A reagent tank is arranged outside the shield construction site, and the discharge port of the reagent tank is communicated with the feed port of the mixer.

2. The system for rapid dehydration and resource utilization of shield mud according to claim 1 is characterized by: The screening device adopts a drum screen.

3. The system for rapid dehydration and resource utilization of shield slurry according to claim 1 is characterized by: The lifting device adopts a bucket elevator.

4. The system for rapid dehydration and resource utilization of shield slurry according to claim 1 is characterized by: The mud tank and the storage tank are respectively adjacent to the stirring tank.

5. The system for rapid dehydration and resource utilization of shield slurry according to claim 2 is characterized by: The diameter of the mesh of the drum screen is 5 mm.

6. A method for rapid dehydration and resource utilization of shield mud, characterized in that: The system for rapid dehydration and resource utilization of shield mud according to any one of claims 1 to 5 comprises the following steps: S1, placing the shield mud into the mud pool, and using the mud pump to pump out the surface water of the shield mud in the mud pool to dewater the shield mud in the mud pool; S2, using an excavator to transport the shield mud after precipitation in the mud pool to the mixing pool, then adding a gel breaker into the mixing pool, and stirring the shield mud and the gel breaker in the mixing pool, so that the shield mud in the mixing pool becomes slag; S3, using an excavator to transport the slag in the mixing tank to the storage tank; S4, using a truck to transport the slag in the storage pool to the storage yard, and mixing the slag in the storage yard with a microbial agent and a sterilizing and deodorizing agent, piling them up, and then leaving them for 7 days for fermentation; S5, using a forklift to place the fermented slag in the storage yard into the mud-stone separator, separating the sand and gravel with a particle size greater than 50 mm from the slag, and stacking them separately; S6, using the first belt conveyor to convey the slag separated by the mud-stone separator to the screening device, using the screening device to separate the sand and gravel with a particle size greater than 5 mm, and stacking them separately; S7, conveying the slag screened by the screening device to the batching machine through the second belt conveyor, and mixing the slag in the batching machine with aggregate to form the required raw materials according to the requirements of resource utilization; S8, using the lifting device to transport the raw materials formed in the batching machine into the mixer; S9, conveying the required reagents into the mixer through the reagent tank, and then utilizing the mixer to stir and mix the raw materials and the required reagents to form a solidified material.

7. The method for rapid dehydration and resource utilization of shield slurry according to claim 6, characterized in that: The surface water extracted in step S1 is clarified and then recycled.

8. The method for rapid dehydration and resource utilization of shield slurry according to claim 6, characterized in that: In step S7, the ratio of the slag to the aggregate in the batching machine is determined according to the type of the raw materials required.

9. The method for rapid dehydration and resource utilization of shield slurry according to claim 6, characterized in that: The type of the required agent is determined according to the type of the solidifying material to be obtained.

10. The method for rapid dehydration and resource utilization of shield slurry according to claim 6, characterized in that: In step S9, the ratio of the raw material to the required agent in the mixer is determined according to the type of the solidifying material to be obtained.

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