Rapid dehydration treatment and recycling system for shield slurry

Abstract

The utility model discloses a system for rapid dehydration treatment and recycling of shield slurry, which relates to the technical field of slurry treatment, and is characterized in that a slurry pool, a stirring pool, a storage pool and the like are arranged on a shield construction site, the slurry is dewatered and changed into muck through the steps of pumping water by a slurry pump, adding a gel breaker for stirring and the like, and then the muck is transported to a stacking yard for fermentation; 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. The system can quickly reduce the water content of the slurry, effectively remove pathogenic bacteria and peculiar smell, realize refined dehydration and efficient resource utilization, reduce the transportation cost, reasonably utilize the site, and better meet the requirements of shield slurry treatment and resource utilization in projects such as subway construction.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of slurry treatment, especially to a system for rapid dewatering and resource utilization of shield slurry. BACKGROUND

[0002] With the rapid development of urban construction, subway construction is widely carried out in major cities. A large amount of shield slurry is generated during the construction of subways. The treatment of shield slurry has become an important problem to be solved, and it faces many difficulties.

[0003] On the one hand, the characteristics of shield slurry itself make it difficult to treat. The water content of shield slurry is as high as 80%, and it is in a liquid state. This high water content and liquid state make the transportation cost high, and the mud truck is usually used to transport the mud and water together, increasing the transportation burden.

[0004] On the other hand, the existing slurry treatment method has many drawbacks. In the early stage of slurry treatment, the key is rapid dewatering, but due to the limited operation site, the slurry generated in a day usually needs to be treated and transported to the designated storage yard within 24 hours. The conventional treatment method is to set up a storage pool outside the construction site, and the slurry is poured into the storage pool for sedimentation and dewatering. After the surface water is drained, further dewatering is carried out by digging and piling up for drying. After a long time of natural dewatering, the water content can be reduced to a certain extent for backfilling. Alternatively, a belt filter is set up in the storage yard, and the slurry is filtered to produce mud cake, reducing the water 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 reagents during shield construction and pressure filtration, the treated residue forms foam soil, which is difficult to dry and compact, and the pathogenic bacteria and odor in the residue are not effectively treated, which greatly hinders the subsequent resource utilization and makes it difficult to achieve true resource utilization.

[0005] In addition, the key problems of shield slurry treatment also lie in the rapid dewatering and resource utilization at the construction site. If the liquid slurry cannot be quickly converted to solid residue and transported by truck in time at the construction site, only relying on the storage yard for treatment, due to the long treatment time, it is impossible to absorb a large amount of generated slurry. Moreover, in the resource utilization link, the shield slurry treated by flocculating agent forms bubble soil (also called repair soil at the construction site), which has the characteristics of forming small cell structure in soil, not easy to dry and compact, which becomes a bottleneck for subsequent resource utilization, and the pathogenic bacteria and odor carried by bubble soil also have adverse effects on the surrounding environment.

[0006] In summary, the existing shield mud treatment technology has many deficiencies in rapid dewatering and resource utilization, and it is difficult to meet the demand of efficient treatment and resource utilization of a large amount of shield mud in subway construction and other projects. Utility model content

[0007] The utility model discloses a kind of shield mud rapid dewatering treatment and resource systems, to solve the problems existing in the prior art described above, improve the efficiency of shield mud dewatering treatment and resource.

[0008] To achieve the above object, the utility model provides the following scheme:

[0009] The utility model provides a kind of shield mud rapid dewatering treatment and resource systems, comprising:

[0010] Mud pool, mixing pool and storage pool are sequentially arranged at shield construction site;

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

[0012] Stacking yard, mudstone separator, first belt conveyor, screening device, second belt conveyor, batching machine, lifting device and mixer are sequentially arranged outside shield construction site, the first belt conveyor is used to transport the spoil separated by the mudstone separator into the screening device, the second belt conveyor is used to transport the spoil meeting the requirements screened by the screening device into the batching machine, and the lifting device is used to transport the discharge of the batching machine into the mixer;

[0013] Medicine tank is arranged outside shield construction site, and the discharge port of the medicine tank is communicated with the feeding port of the mixer.

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

[0015] Preferably, the lifting device adopts bucket elevator.

[0016] Preferably, the mud pool and the storage pool are respectively adjacent to the mixing pool.

[0017] Preferably, the aperture of the screen hole of the drum screen is 5mm.

[0018] The utility model also provides a kind of shield mud rapid dewatering treatment and resource method, based on the above shield mud rapid dewatering treatment and resource system, comprising the following steps:

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

[0020] S2, the excavator is used for transporting the shield mud after dewatering in the mud pool to the stirring pool, then the breaker is added in the stirring pool, and the shield mud and the breaker in the stirring pool are stirred, so that the shield mud in the stirring pool becomes the spoil;

[0021] S3, the excavator is used for transporting the spoil in the stirring pool to the storage pool;

[0022] S4, the spoil in the storage pool is transported to the stacking field by the truck, and the spoil in the stacking field is mixed with the microbial agent and the sterilization and deodorization agent, and is stacked, and then is placed for 7 days to ferment;

[0023] S5, the spoil after fermentation in the stacking field is placed in the mudstone separator by the forklift, the sand and stone with a particle size greater than 50mm in the spoil are separated out, and are stacked separately;

[0024] S6, the spoil separated out by the mudstone separator is transported to the screening device by the first belt conveyor, the sand and stone with a particle size greater than 5mm are separated out by the screening device, and are stacked separately;

[0025] S7, the spoil screened out by the screening device is transported to the batching machine by the second belt conveyor, and the spoil in the batching machine is mixed with the aggregate to form the required raw material according to the requirement of resource utilization;

[0026] S8, the raw material formed in the batching machine is transported to the mixer by the lifting device;

[0027] S9, the required agent is transported to the mixer by the agent tank, and then the raw material and the required agent are stirred and mixed by the mixer to form the solidified material.

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

[0029] Preferably, in step S7, the proportion of the spoil in the batching machine and the aggregate is determined according to the type of the required raw material.

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

[0031] Preferably, in step S9, the proportion of the raw material and the required agent in the mixer is determined according to the type of the required solidified material.

[0032] The utility model discloses the following technical effects are obtained relative to prior art:

[0033] The system for rapid dewatering treatment and resource utilization of shield mud improves the efficiency of dewatering treatment and resource utilization of shield mud.

[0034] Further, the mud pool, the stirring pool and the storage pool are arranged at the shield construction site, the surface water of the mud in the mud pool is first pumped out by the mud pump, the preliminary precipitation operation is realized, the water content of the mud can be quickly reduced, compared with the method of simply relying on natural sedimentation or the belt filter machine in the conventional treatment mode, which may need a long time to achieve a certain dewatering effect, the dewatering process is effectively accelerated in the early stage of treatment.

[0035] Further, the breaker is added in the stirring pool and stirred to change the mud into the slag, which further changes the state of the mud and changes it from the flow state to the solid slag form which is easier to handle, which is more favorable for subsequent transportation, stacking and further dewatering treatment and other operations, and is more efficient and direct in realizing the solidification of the mud compared with the traditional treatment mode.

[0036] Further, in the subsequent treatment process outside the shield construction site, the mud-stone separator, the screening device (such as the drum screen) and other equipment are arranged, the large particle sandstone with a particle size greater than 50mm is separated out in the mud-stone separator, and then the sandstone with a particle size greater than 5mm is separated out through the screening device, and the large particle sandstone in the slag is gradually removed, so that the composition of the slag is more uniform.

[0037] Further, in the stacking field, the slag is mixed with the microbial agent and the sterilization and deodorization agent and subjected to fermentation treatment for 7 days, which can effectively treat the pathogenic bacteria and odor carried by the slag, compared with the slag treated by the existing treatment method, the pathogenic bacteria and odor are not effectively treated, which hinders the resource utilization, and the present application greatly improves the feasibility of subsequent resource utilization of the slag.

[0038] Further, the screened slag is mixed with the aggregate to form the raw material, and is mixed with the required agent in the stirrer to form the consolidated material, so that the treated slag can be processed into the material meeting the specific requirements according to the requirements of resource utilization, realizes the transformation from the originally difficult-to-use shield mud to the consolidated material with certain engineering application value, and effectively expands the way of resource utilization of the shield mud.

[0039] Further, the whole treatment system and method can convert the shield mud into recyclable material more efficiently, avoid the waste phenomenon that a large amount of shield mud cannot be truly recycled due to the difficulty in processing foam soil and other conditions under the traditional processing mode, improve the utilization efficiency of shield mud resources in subway construction and other projects, and better meet the demand of resource recycling in engineering.

[0040] Further, the preliminary dewatering and solidification treatment of the mud at the construction site makes the transportation amount of the spoil transported to the storage site greatly reduced compared with the case of transporting mud with water under the traditional mode, reduces the transportation cost, and also relieves the transportation burden, because the transportation difficulty of the flow state mud is relatively large, and the transportation of the solid spoil is more convenient.

[0041] Further, in the subsequent processing process, the sand and other materials further separated through multi-stage screening and other operations can be separately stacked, which makes the transportation and subsequent processing of various materials more orderly, and avoids the inconvenience and additional cost that may be caused by mixed transportation and processing.

[0042] Further, the mud pool, mixing pool and storage pool and other facilities are reasonably arranged at the shield construction site, the space of the construction site is fully utilized for the preliminary mud processing operation, and the problem of insufficient site utilization caused by the full dependence on the storage site outside the construction site in the existing processing mode is avoided.

[0043] The storage site outside the construction site and the subsequent processing equipment are also arranged in an orderly manner, the spoil is gradually processed through different equipment, the utilization of the whole site is more reasonable and efficient, the processing capacity of the site is improved, and the processing demand of a large amount of shield mud in subway construction and other projects can be better met.

[0044] Further, the shield mud rapid dewatering treatment and resource system has achieved good technical effects in dewatering treatment, resource utilization, transportation and site utilization, effectively solves many deficiencies of the existing shield mud processing technology, and can better meet the efficient processing and resource demand of a large amount of shield mud in subway construction and other projects. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1This is a schematic structural diagram of a system for rapid dehydration and resource utilization of shield slurry according to the present invention;

[0047] Figure 2 This is 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 tank; 3. Storage tank; 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0050] The purpose of the utility model is to provide a system 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 implementation methods.

[0052] Example 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, mixing pool 2 and storage pool 3 are sequentially arranged at the shield construction site;

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

[0056] The storage yard 4, the debris separator 5, the first belt conveyor 6, the screening device 7, the second belt conveyor 8, the batching machine 9, the lifting device 10 and the mixer 11 are sequentially arranged outside the shield construction site. The first belt conveyor 6 is used to transport the debris separated by the debris separator to the screening device 7, the second belt conveyor 8 is used to transport the debris 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 alternative solution of this embodiment, preferably, the screening device 7 is a drum screen with a sieve hole diameter of 5 mm. The lifting device 10 is 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 the mud pool 1, the mixing pool 2 and the 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 relying entirely on the storage yard 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 large amount of shield mud processing needs in projects such as subway construction.

[0061] Example 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, including the following steps:

[0063] S1. Place the shield mud into the mud pool 1 and use 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. Use an excavator to transport the shield mud after dewatering in the mud pool 1 to the mixing pool 2, then add a gel breaker to the mixing pool 2, and stir 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. The slag in the storage tank 3 is transported to the storage yard 4 by truck, and the slag in the storage yard 4 is mixed with a microbial agent and a sterilizing and deodorizing agent, piled up, and then left for 7 days for fermentation;

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

[0068] S6, the sludge separated by the mudstone separator 5 is transported to the screening device 7 by the first belt conveyor 6, and the sand and stone with a particle size greater than 5 mm is separated by the screening device 7 and is separately stacked;

[0069] S7, the sludge separated by the screening device 7 is transported to the batching machine 9 by the second belt conveyor 8, and the sludge in the batching machine 9 is mixed with the aggregate to form the required raw material according to the requirements of resource utilization;

[0070] S8, the raw material formed by the batching machine 9 is transported to the mixer 11 by the lifting device 10;

[0071] S9, the required medicament is transported to the mixer 11 by the medicament tank 12, and then the raw material is stirred and mixed with the required medicament by the mixer 11 to form the consolidated material.

[0072] In the optional scheme of the embodiment, the surface water extracted in step S1 is preferably clarified and recycled.

[0073] In the embodiment: in step S7, the ratio of the sludge to the aggregate in the batching machine is determined according to the type of the required raw material; the type of the required medicament is determined according to the type of the required consolidated material; in step S9, the ratio of the raw material to the required medicament in the mixer is determined according to the type of the required consolidated material.

[0074] It is worth noting that the sludge and aggregate (generally referred to as sand and stone) separated by the screening device 7 can be mixed with cementing materials to make backfill soil, roadbed soil, water-stable soil or as raw materials for non-burning bricks, but the consolidated material in the embodiment can be but is not limited to backfill soil, roadbed soil, water-stable soil and raw materials for non-burning bricks.

[0075] The embodiment sets mud pool 1, mixing pool 2 and storage pool 3 and other facilities at the shield construction site, and first extracts the surface water of the mud in the mud pool 1 by the mud pump, realizes the preliminary dewatering operation, can quickly reduce the water content of the mud, compared with the method of simply relying on natural sedimentation or belt filter press in the existing conventional treatment mode which may need a long time to achieve a certain dehydration effect, effectively accelerates the dehydration process in the early stage of treatment. The mud is changed into sludge by adding a breaker and stirring in the mixing pool 2, which further changes the state of the mud and makes it change from a flow state to a more easily handled solid sludge form, which is more advantageous for subsequent transportation, stacking and further dehydration treatment and other operations, and is more efficient and direct in realizing the solidification of the mud compared with the traditional treatment mode.

[0076] In the subsequent treatment process outside the shield construction site, a mudstone separator 5, a screening device 7 (such as a drum screen) and other equipment are arranged, and through multi-stage screening operations, such as first separating out sand and stones with a particle size greater than 50 mm in the mudstone separator 5, and then separating out sand and stones with a particle size greater than 5 mm through the screening device 7, the larger particles of sand and stones in the spoil are gradually removed, so that the composition of the spoil is more uniform. In the stacking field 4, the spoil is mixed with microbial agents and sterilization and deodorization agents and subjected to 7-day fermentation treatment. This operation can effectively treat the pathogenic bacteria and odors and other adverse factors carried in the spoil, compared with the spoil treated by the existing treatment method, which has not been effectively treated, thereby hindering the resource utilization. The embodiment greatly improves the feasibility of subsequent resource utilization of the spoil. Through subsequent mixing of the screened spoil with aggregates to form raw materials, and mixing with the required agents in the mixer 11 to form consolidated materials, the treated spoil can be processed into materials meeting specific requirements according to the requirements of resource utilization, realizing the transformation from the originally difficult-to-utilize shield mud to consolidated materials with certain engineering application value, and effectively expanding the resource utilization approach of the shield mud.

[0077] The entire treatment system and method of the embodiment can more efficiently convert the shield mud into resource-utilizable materials, avoid the waste phenomenon that a large amount of shield mud cannot be truly resource-utilized due to the difficulty in treating the foamed soil and the like under the traditional treatment mode, improve the utilization efficiency of the shield mud resources in the engineering such as subway construction, and better meet the demand of the engineering for resource recycling.

[0078] Through the preliminary dewatering and solidification treatment of the mud at the construction site, the transportation amount of the spoil transported to the stacking field 4 is greatly reduced compared with the case of transporting the mud with water under the traditional mode, the transportation cost is reduced, and the transportation burden is also reduced. Because the transportation of the flow state mud is relatively difficult, the transportation of the solid state spoil is more convenient. Experiments show that the embodiment can convert the shield mud with a water content of 80% into spoil with a water content of 20%, and still bring rich income after deducting the cost of agents and man-machine-electricity, and the spoil resource treatment also has an income.

[0079] In the subsequent treatment process, the sand and stones and the like further separated through multi-stage screening operations can be separately stacked, which makes the transportation and subsequent treatment of various materials more orderly, and avoids the inconvenience and additional cost that may be caused by mixed transportation and treatment.

[0080] The principle and implementation mode of the utility model are described by applying specific examples, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A system for rapid dehydration and resource utilization of shield mud, characterized by: 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 being used to pump out surface water of the mud in the mud pool; A storage yard, a debris 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. The first belt conveyor is used to transport the debris separated by the debris separator to the screening device. The second belt conveyor is used to transport the debris that meets the requirements screened by the screening device to the batching machine. 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 connected to the feed port of the mixer.

2. The shield slurry rapid dehydration treatment and resource recovery system according to claim 1 is characterized by: The screening device adopts a drum screen.

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

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

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

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