Urban shield slag treatment system and treatment method

Abstract

The present invention relates to an urban shield slag treatment system and a treatment method thereof. The system comprises a gravity-type back filter, a three-way material distribution valve, a dewatering screen, a gravity-type extrusion solid-liquid separation device, a clarifier, a centrifugal dewatering machine, and a water purification device. The treatment method is applied to the above-mentioned urban shield slag treatment system. The system can effectively reduce the amount of shield slag, treat harmful compounds such as foaming agents in the shield slag, and realize resource utilization of the shield slag. The system has the characteristics of wide application range, reduced transportation and treatment and disposal costs of shield slag, low operating costs, and high work efficiency. The system is applicable to shield slag and other slag generated in tunnel projects such as subway tunnel construction, highway traffic tunnel construction, railway traffic tunnel construction, and other underground engineering construction. The pretreatment tank can realize slurrying, sand removal and reduction of the shield slag, obtain resource-utilizable sand and gravel aggregates and smaller-volume fine-particle slurry, reduce subsequent processing volume and facilitate subsequent processing.

Description

Technical Field

[0001] The invention relates to the technical field of shield slurry treatment, in particular to an urban shield slag treatment system and a treatment method thereof. Background Art

[0002] When slurry shield construction is carried out in muddy siltstone formations, a large amount of slurry is generated. Since municipal tunnel construction is restricted by various factors such as urban transportation, buildings, and environmental protection, the construction site is generally very compact. Therefore, the waste slurry generated during the excavation process must be handled in a timely and effective manner. At the same time, the shield waste slurry has the characteristics of high specific gravity, many fine particles, strong viscosity, and difficulty in sedimentation. Direct discharge will block sewage pipes, pollute water bodies, and affect the natural environment.

[0003] Traditional shield slurry treatment is to select one or more methods for treatment within a limited range of treatment measures. Relatively more is to directly use mud-water separation equipment for screening, directly discard high-concentration overflow slurry, or add lime, flocculants and other agents for precipitation and separation after entering the sedimentation tank, or use filter press equipment to re-separate the overflow slurry.

[0004] For example, the patent application document with Chinese invention patent application number CN201911281072.7 discloses a shield machine towed solid-liquid separation system and separation method, including a trolley frame arranged behind the shield system, and a solid-liquid separation system is provided on the trolley frame; the structure of the solid-liquid separation system is as follows: the underscreen of the pre-screen is connected to the inlet of the cyclone, the heavy phase outlet of the cyclone is connected to the dewatering screen, and the underscreen of the dewatering screen is connected to the slurry storage tank; the slurry storage tank is connected to the inlet of the cyclone; the supernatant outlet of the cyclone is connected to the overflow box, and the overflow port of the overflow box is connected to the clean slurry tank, and the clean slurry tank is provided with a second sewage pump to return the clean slurry to the shield system; the overscreen of the pre-screen and the dewatering screen is transported to a slag bucket car, and the separation method is in a pipeline near the sludge pump.

[0005] An online viscosity sensor is provided to switch the machine-towed solid-liquid separation system and the ground mud and water treatment system. The present invention can follow the tunneling of the shield system and perform mud solid-liquid separation at any time to reduce the amount of sand and gravel discharged.

[0006] The above-mentioned prior art discloses a shield machine towed solid-liquid separation system and separation method. In actual application, the above-mentioned prior art has the problem of incomplete solid-liquid separation, and the separated liquid phase cannot directly enter the shield machine for reuse. Summary of the Invention

[0007] In view of this, the present invention aims to propose an urban shield tunneling slag treatment system and a treatment method thereof, so as to overcome the deficiencies of the existing technology and solve the above-mentioned problems.

[0008] To achieve the above-mentioned purpose, the present invention proposes a technical solution: an urban shield slag treatment system, which includes:

[0009] Gravity filter 1 is used to reduce the water content in shield tunneling debris, and obtain large-particle debris, clay particle debris and underflow debris after treatment;

[0010] Three-way material distribution valve 2 is used to arrange large-particle slag, clay-particle slag and underflow slag into the corresponding treatment system;

[0011] Dewatering screen 3, used for dewatering large particles of soil;

[0012] Gravity-type extrusion solid-liquid separation equipment 4, used for solid-liquid separation of clay particles and slag;

[0013] The clarifier 5 is used for solid-liquid clarification and separation of the underflow slag obtained by the gravity filter 1, the gravity extrusion solid-liquid separation equipment 4 and the dewatering screen 3;

[0014] A centrifugal dehydrator 6 is used to separate the solid and liquid from the underflow soil obtained from the clarifier 5;

[0015] The water purification equipment 7 is used to purify the water produced in the centrifugal dehydrator 6 and discharge the purified water through the clean water pump 8 or use it for equipment water.

[0016] Furthermore, the system also includes:

[0017] The spiral feeding mechanism 9 is used to transport clay particles and slag;

[0018] The slag silo 10 is used to store the clay granules and slag delivered by the spiral feeding mechanism 9;

[0019] The belt conveyor 11 is used to gradually transport the clay particles and slag in the slag silo 10 to the gravity-type extrusion solid-liquid separation equipment 4 .

[0020] Furthermore, a dry powder flocculation preparation unit 12 is provided between the clarification tank 5 and the centrifugal dehydrator 6 , and the dry powder flocculation preparation unit 12 is used to accelerate the solid-liquid separation process of the underflow slag in the centrifugal dehydrator 6 .

[0021] Furthermore, the dry powder flocculation preparation unit 12 mixes the flocculant with the underflow soil through the pipeline mixer 13 and then feeds the mixture into the centrifugal dehydrator 6 .

[0022] Furthermore, the liquid outlets of the clarification tank 5 and the dry powder flocculation preparation unit 12 are both provided with a screw pump 14 and a flow meter 15 .

[0023] Furthermore, when the clean water pump 8 pumps the water to be used for equipment water, the water is transported to the centrifugal dehydrator 6 and / or the dry powder flocculation preparation unit 12 through the delivery pipe 16 .

[0024] To achieve the above object, another technical solution proposed by the present invention is: a method for treating urban shield slag, which is applied to the above-mentioned urban shield slag treatment system, and comprises:

[0025] S1, using an excavator 17 to place urban shield debris into a gravity filter 1 for moisture content treatment, to obtain large-particle debris, clay particle debris and underflow debris;

[0026] S2, arrange the large particle slag, clay particle slag and underflow slag into the corresponding treatment system through the three-way distribution valve 2;

[0027] S3, large particles of soil are dehydrated in the dehydration screen 3;

[0028] S4, the clay particles and slag are subjected to solid-liquid separation in the gravity-type extrusion solid-liquid separation equipment 4;

[0029] S5, the underflow slag obtained by the gravity filter 1, the gravity extrusion solid-liquid separation device 4 and the dewatering screen 3 is subjected to solid-liquid clarification and separation in the clarifier 5;

[0030] S6, the underflow slag obtained from the clarifier 5 is subjected to solid-liquid separation in the centrifugal dehydrator 6;

[0031] S7, the water produced in the centrifugal dehydrator 6 is purified in the water purification equipment 7, and the purified water is discharged through the clean water pump 8 or used as water for equipment.

[0032] Furthermore, the dry powder flocculation preparation unit 12 mixes the flocculant with the underflow soil through the pipeline mixer 13 and then feeds the mixture into the centrifugal dehydrator 6 , thereby accelerating the solid-liquid separation process of the underflow soil in the centrifugal dehydrator 6 .

[0033] Furthermore, when the clean water pump 8 pumps the water to be used for equipment water, the water is transported to the centrifugal dehydrator 6 and / or the dry powder flocculation preparation unit 12 through the delivery pipe 16 .

[0034] Furthermore, the supernatant in the clarifier tank 5 is discharged through a pipeline or reused.

[0035] The beneficial effects of the present invention are:

[0036] It can effectively reduce the amount of shield slag, treat harmful compounds such as foaming agents in shield slag, and realize the resource utilization of shield slag. It has the characteristics of wide application range, reduced transportation and disposal costs of shield slag, low operating cost, high work efficiency, and no secondary pollution. It is applicable to tunnel projects such as subway tunnel construction, highway traffic tunnel construction, railway traffic tunnel construction, and shield slag and other slag generated in other underground engineering construction; the pretreatment tank can realize the slurrying, sand removal and reduction of shield slag, and obtain resource-usable sand and gravel aggregates and smaller fine-particle slurry, which can reduce the subsequent processing volume and facilitate subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the structure of the urban shield slag treatment system in Example 1 of the present invention;

[0038] Figure 1 , the reference numerals include:

[0039] 1. Gravity filter; 2. Three-way feed valve; 3. Dewatering screen; 4. Gravity extrusion solid-liquid separation equipment; 5. Clarifier; 6. Centrifugal dehydrator; 7. Water purification equipment; 8. Clean water pump; 9. Screw feed mechanism; 10. Slag silo; 11. Belt conveyor; 12. Dry powder flocculation preparation unit; 13. Pipeline mixer; 14. Screw pump; 15. Flow meter; 16. Delivery pipe; 17. Excavator DETAILED DESCRIPTION

[0040] The following, combined with the accompanying drawings, provides a clear and complete description of the technical solutions in the embodiments of the present invention, including the in-liner alignment mechanism, alignment device system, and pipeline welding method. Obviously, the described embodiments represent only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are considered within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1As shown, the urban shield slag processing system includes:

[0044] Gravity filter 1 is used to reduce the water content in shield tunneling debris, and obtain large-particle debris, clay particle debris and underflow debris after treatment;

[0045] Three-way material distribution valve 2 is used to arrange large-particle slag, clay-particle slag and underflow slag into the corresponding treatment system;

[0046] Dewatering screen 3, used for dewatering large particles of soil;

[0047] Gravity-type extrusion solid-liquid separation equipment 4, used for solid-liquid separation of clay particles and slag;

[0048] The clarifier 5 is used for solid-liquid clarification and separation of the underflow slag obtained by the gravity filter 1, the gravity extrusion solid-liquid separation equipment 4 and the dewatering screen 3;

[0049] A centrifugal dehydrator 6 is used to separate the solid and liquid from the underflow soil obtained from the clarifier 5;

[0050] The water purification equipment 7 is used to purify the water produced in the centrifugal dehydrator 6 and discharge the purified water through the clean water pump 8 or use it for equipment water.

[0051] Furthermore, the system also includes:

[0052] The spiral feeding mechanism 9 is used to transport clay particles and slag;

[0053] The slag silo 10 is used to store the clay granules and slag delivered by the spiral feeding mechanism 9;

[0054] The belt conveyor 11 is used to gradually transport the clay particles and slag in the slag silo 10 to the gravity-type extrusion solid-liquid separation equipment 4 .

[0055] Furthermore, a dry powder flocculation preparation unit 12 is provided between the clarification tank 5 and the centrifugal dehydrator 6 , and the dry powder flocculation preparation unit 12 is used to accelerate the solid-liquid separation process of the underflow slag in the centrifugal dehydrator 6 .

[0056] Furthermore, the dry powder flocculation preparation unit 12 mixes the flocculant with the underflow soil through the pipeline mixer 13 and then feeds the mixture into the centrifugal dehydrator 6 .

[0057] Furthermore, the liquid outlets of the clarification tank 5 and the dry powder flocculation preparation unit 12 are both provided with a screw pump 14 and a flow meter 15 .

[0058] Furthermore, when the clean water pump 8 pumps the water to be used for equipment water, the water is transported to the centrifugal dehydrator 6 and / or the dry powder flocculation preparation unit 12 through the delivery pipe 16 .

[0059] It can effectively reduce the amount of shield slag, treat harmful compounds such as foaming agents in shield slag, and realize the resource utilization of shield slag. It has the characteristics of wide application range, reduced transportation and disposal costs of shield slag, low operating cost, high work efficiency, and no secondary pollution. It is applicable to tunnel projects such as subway tunnel construction, highway traffic tunnel construction, railway traffic tunnel construction, and shield slag and other slag generated in other underground engineering construction; the pretreatment tank can realize the slurrying, sand removal and reduction of shield slag, and obtain resource-usable sand and gravel aggregates and smaller fine-particle slurry, which can reduce the subsequent processing volume and facilitate subsequent processing.

[0060] Example 2

[0061] A method for treating urban shield slag is applied to the urban shield slag treatment system described in the above embodiment 1, and includes:

[0062] S1, using an excavator 17 to place urban shield debris into a gravity filter 1 for moisture content treatment, to obtain large-particle debris, clay particle debris and underflow debris;

[0063] S2, arrange the large particle slag, clay particle slag and underflow slag into the corresponding treatment system through the three-way distribution valve 2;

[0064] S3, large particles of soil are dehydrated in the dehydration screen 3;

[0065] S4, the clay particles and slag are subjected to solid-liquid separation in the gravity-type extrusion solid-liquid separation equipment 4;

[0066] S5, the underflow slag obtained by the gravity filter 1, the gravity extrusion solid-liquid separation device 4 and the dewatering screen 3 is subjected to solid-liquid clarification and separation in the clarifier 5;

[0067] S6, the underflow slag obtained from the clarifier 5 is subjected to solid-liquid separation in the centrifugal dehydrator 6;

[0068] S7, the water produced in the centrifugal dehydrator 6 is purified in the water purification equipment 7, and the purified water is discharged through the clean water pump 8 or used as water for equipment.

[0069] Furthermore, the dry powder flocculation preparation unit 12 mixes the flocculant with the underflow soil through the pipeline mixer 13 and then feeds the mixture into the centrifugal dehydrator 6 , thereby accelerating the solid-liquid separation process of the underflow soil in the centrifugal dehydrator 6 .

[0070] Furthermore, when the clean water pump 8 pumps the water to be used for equipment water, the water is transported to the centrifugal dehydrator 6 and / or the dry powder flocculation preparation unit 12 through the delivery pipe 16 .

[0071] Furthermore, the supernatant in the clarifier tank 5 is discharged through a pipeline or reused.

[0072] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. Urban shield slag treatment system, characterized by: The system includes: A gravity filter (1) is used to reduce the water content in the shield slag, and after treatment, large-particle slag, clay-particle slag and underflow slag are obtained; A three-way distribution valve (2) is used to arrange large-particle slag, clay-particle slag and underflow slag into corresponding treatment systems; A dewatering screen (3) is used to dewater large particles of soil; Gravity-type extrusion solid-liquid separation equipment (4) for performing solid-liquid separation on clay particle slag; a clarifier (5) for performing solid-liquid clarification separation on the underflow slag obtained by the gravity filter (1), the gravity extrusion solid-liquid separation equipment (4) and the dewatering screen (3); a centrifugal dehydrator (6) for separating solids from liquids in the underflow slag obtained from the clarifier (5); A water purification device (7) is used to purify the water produced by the centrifugal dehydrator (6) and to discharge the purified water through a clean water pump (8) or use it for equipment water; A dry powder flocculation preparation unit (12) is provided between the clarifier (5) and the centrifugal dehydrator (6), and the dry powder flocculation preparation unit (12) is used to accelerate the solid-liquid separation process of the underflow slag in the centrifugal dehydrator (6); The dry powder flocculation preparation unit (12) mixes the flocculant with the underflow slag through the pipeline mixer (13) and then enters the mixture into the centrifugal dewatering machine (6), thereby accelerating the solid-liquid separation process of the underflow slag in the centrifugal dewatering machine (6).

2. The urban shield slag processing system according to claim 1, characterized in that: The system also includes: A spiral feeding mechanism (9) is used to transport clay particles and slag; The slag silo (10) is used to store the clay granules and slag delivered by the spiral feeding mechanism (9); The belt conveyor (11) is used to gradually transport the clay particles in the slag silo (10) to the gravity-type extrusion solid-liquid separation device (4).

3. The urban shield slag processing system according to claim 1, characterized in that: The liquid outlets of the clarification tank (5) and the dry powder flocculation preparation unit (12) are both provided with screw pumps (14) and flow meters (15).

4. The urban shield slag processing system according to claim 1, characterized in that: When the clean water pump (8) pumps the water to be used for equipment, the water is transported to the centrifugal dehydrator (6) and / or the dry powder flocculation preparation unit (12) through the delivery pipe (16).

5. Urban shield tunneling slag treatment method, characterized in that: The method is applied to the urban shield slag processing system according to any one of claims 1 to 4, and the method comprises: S1, placing urban shield slag into a gravity filter tank (1) by an excavator (17) for water content treatment, and obtaining large-particle slag, clay-particle slag and underflow slag after treatment; S2, arranging the large particle slag, clay particle slag and underflow slag into the corresponding treatment system through the three-way distribution valve (2); S3, large particles of slag are dehydrated in the dehydration screen (3); S4, the clay particles and slag are subjected to solid-liquid separation in a gravity-type extrusion solid-liquid separation device (4); S5, the underflow slag obtained by the gravity filter (1), the gravity extrusion solid-liquid separation equipment (4) and the dewatering screen (3) is subjected to solid-liquid clarification and separation in the clarifier (5); S6, separating the underflow sludge obtained from the clarifier (5) into solid-liquid in a centrifugal dehydrator (6); S7. The water produced in the centrifugal dehydrator (6) is purified in the water purification equipment (7), and the purified water is discharged through the clean water pump (8) or used for equipment water.

6. The urban shield tunneling slag treatment method according to claim 5, characterized in that: When the clean water pump (8) pumps the water to be used for equipment, the water is transported to the centrifugal dehydrator (6) and / or the dry powder flocculation preparation unit (12) through the delivery pipe (16).

7. The urban shield tunneling slag treatment method according to claim 5, characterized in that: The supernatant from the clarifier (5) is discharged through a pipeline or reused.

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