Mud-water separation device and method for mud generated by shield machine excavation operation

Abstract

The present invention proposes a novel mud-water separation device and method for shield machine mud. Since a sand washing machine washing process is added at the bottom of the first-stage cyclone, the clay component can be separated from the sand and gravel, which well overcomes the shortcomings of the existing mud and water treatment process, specifically including: first, the mud content and water content of the sand and gravel screened by the two-stage dewatering screen are greatly reduced, reaching the standard of sand and gravel for construction, so that the slag that was originally discarded in large quantities can be recycled and reused as qualified concrete materials, which not only creates economic benefits but also protects resources from being wasted; second, the discharge of waste slag is reduced, the transportation cost is reduced, the occupation of land by waste slag is saved, and the environmental pollution caused by spillage and stacking during transportation is effectively reduced; third, since the material falling on the vibrating screen does not contain clay mud, the screen is not easily blocked, the screening efficiency is improved, and the safe and stable operation of construction production is guaranteed.

Description

Technical Field

[0001] The invention relates to mud-water separation equipment and method for mud generated by shield machine excavation operation, belonging to the field of mud-water treatment. Technical Background

[0002] In the traditional mud water treatment process, such as Figure 1 As shown, the slurry (containing clay blocks, gravel, sand, clay, etc.) discharged from the shield machine first enters the decompression box 102 for decompression, and then enters the pre-screen 101. The material on the screen is the material with a particle size greater than 4 mm, and enters the slag yard for stacking; the material with a particle size less than 4 mm passes through the screen and enters the A slurry storage tank 1013 and the B slurry storage tank 1012 connected thereto, and is pumped into the primary cyclone 104 by the 1# slurry pump 1011. The overflow fine particle slurry of the primary cyclone 104 enters the C slurry storage tank 1010 for secondary separation or returns to the B slurry storage tank 1012 for recycling or enters the sedimentation tank 109; the bottom flow coarse particle slurry of the primary cyclone 104 is injected into the primary dewatering vibrating screen 103, and the material on the screen is 2~ 4mm materials enter the slag yard for stacking; materials with a particle size of less than 2mm pass through the screen and enter the B slurry storage tank 1011 for recycling, or enter the C slurry storage tank 1010 through the connecting pipe 105 between the B slurry storage tank and the C slurry storage tank, and are pumped into the secondary cyclone 107 by the 2# slurry pump 108. The overflow fine particle slurry of the secondary cyclone 107 enters the sedimentation tank 109 or returns to the C slurry storage tank 1010 for recycling, and the underflow slurry of the secondary cyclone 107 enters the secondary dewatering vibrating screen 106. The material on the screen is 0.074-2mm and enters the slag yard for stacking; the fine particle material passing through the secondary dewatering screen 106 enters the C slurry storage tank 1010 for recycling or is discharged into the sedimentation tank 109. Summary of the invention

[0003] According to one aspect of the present invention, there is provided a mud-water separation device for mud generated by shield machine excavation operation, which is characterized by comprising:

[0004] The first slurry storage tank and the second slurry storage tank are interconnected,

[0005] A first slurry pump and a primary cyclone, the material in the second slurry storage tank is pumped into the primary cyclone by the first slurry pump;

[0006] The third slurry storage tank and the sedimentation tank, the overflow fine particle slurry of the primary cyclone enters the third slurry storage tank for secondary separation or is returned to the second slurry storage tank for recycling or enters the sedimentation tank;

[0007] Sand washing machine and primary dewatering vibrating screen. The coarse particle slurry from the bottom flow of the primary cyclone enters the sand washing machine. After being washed with water in the sand washing machine, the washed clay slurry overflows to the second slurry storage tank and enters the next cycle. The sand and stone materials without clay after washing enter the primary dewatering vibrating screen; the screened materials of the primary dewatering vibrating screen are sent to the slag yard for stacking; the materials that pass through the screen of the primary dewatering vibrating screen enter the second slurry storage tank;

[0008] The second slurry pump and the secondary hydrocyclone, the material in the third slurry storage tank is pumped into the secondary hydrocyclone by the second slurry pump, and the overflow fine particle slurry of the secondary hydrocyclone is discharged into the sedimentation tank or returned to the third slurry storage tank for recycling;

[0009] Secondary dewatering vibrating screen, the bottom flow slurry of the secondary cyclone enters the secondary dewatering vibrating screen, and the screen material of the secondary dewatering vibrating screen is sent to the slag yard for stacking; the fine particle material passing through the secondary dewatering screen enters the third slurry storage tank for recycling and / or is discharged into the sedimentation tank.

[0010] According to another aspect of the present invention, a method for separating mud and water from mud generated by shield machine excavation operation is provided, which is characterized by comprising:

[0011] Using the first slurry pump to pump the material from the second slurry storage tank into the primary cyclone;

[0012] The overflow fine particle slurry of the primary cyclone enters the third slurry storage tank for secondary separation or returns to the second slurry storage tank for recycling or enters the sedimentation tank;

[0013] The coarse particle slurry at the bottom flow of the primary cyclone enters the sand washer, and the clay slurry washed out by the sand washer overflows to the second slurry storage tank to enter the next cycle, so that the sand and stone materials without clay washed by the sand washer enter the primary dewatering vibrating screen;

[0014] Send out the material on the first-stage dewatering vibrating screen;

[0015] The material passing through the screen of the primary dewatering vibrating screen is sent to the second slurry storage tank;

[0016] The material in the third slurry storage tank is pumped into the secondary cyclone by the second slurry pump.

[0017] The overflow fine particle slurry of the secondary cyclone is discharged into the sedimentation tank or returned to the third slurry storage tank for recycling.

[0018] The bottom flow slurry of the secondary cyclone enters the secondary dewatering vibrating screen.

[0019] Discharge the screen material of the secondary dehydration vibrating screen.

[0020] The fine particles passing through the secondary dewatering screen are sent to the third slurry storage tank for recycling and / or discharged into the sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the mud water treatment process of the prior art.

[0022] Figure 2 It is a schematic diagram of a mud-water separation scheme for shield machine mud according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram of three slurry storage tanks connected to each other in a mud-water separation scheme for a shield machine slurry according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The inventors have found in engineering practice that when a shield machine excavates a tunnel in a stratum containing sand, stone and clay, the slag it discharges contains a large amount of viscous mud components. Figure 1 When the process flow of the prior art solution shown is used to separate the slag from the mud and water, due to the coexistence of sand, stone and clay components in the upper and lower materials of the two-stage dewatering screen, this will lead to the following three adverse consequences. First, since the mud content in the upper material exceeds the standard, it cannot be recycled as a concrete raw material for civil engineering projects, resulting in a waste of precious sand and gravel resources; second, even if it is discharged as waste slag, it will be difficult to dehydrate the slag due to the influence of clay, resulting in excessive water content in the slag, which is easy to be spilled during external transportation, polluting the road surface and the surrounding environment; third, clay can easily clog the vibrating screen, affecting the normal production.

[0025] In order to overcome the shortcomings of the above-mentioned mud and water treatment process, the inventors have proposed a novel mud and water separation device and method for shield machine mud after repeated research, wherein a sand washer is added at the bottom of the first-stage cyclone.

[0026] like Figure 2As shown, in the mud-water separation device of the shield machine mud according to an embodiment of the present invention, the mud (including clay blocks, gravel, sand, clay, etc.) discharged from the shield machine first enters the decompression box 202 for decompression, and then enters the pre-screen 201. The material on the screen is the material with a particle size greater than 4 mm, which is sent to the slag yard for stacking; the material with a particle size less than 4 mm passes through the screen of the pre-screen 201 and enters the A slurry tank 2014 and the B slurry tank 2013 connected thereto in turn, and is then pumped into the primary cyclone 205 by the 1# slurry pump 2012; the overflow fine particle slurry of the primary cyclone 205 enters the C slurry tank 2011 for secondary separation or returns to the B slurry tank 2013 for recycling or enters the sedimentation tank 201 0; the coarse particle slurry of the bottom flow of the primary cyclone 205 enters the sand washer 204, and after being fully washed by water in the sand washer 204, the washed clay slurry overflows to the B slurry storage tank 2013 to enter the next cycle, and the sand and stone materials without clay after washing enter the primary dewatering vibrating screen 203; the materials on the screen of the primary dewatering vibrating screen 203 are 2-4 mm, which are sent to the slag yard for stacking; the materials with a particle size of less than 2 mm pass through the screen of the primary dewatering vibrating screen 203 and enter the B slurry storage tank 2013; the materials entering the B slurry storage tank 2013 are recycled, or enter the C slurry storage tank 2011 through the connecting pipe 206 between the B slurry storage tank and the C slurry storage tank, and are pumped into the secondary cyclone 208 by the 2# slurry pump 209. The overflow fine particle slurry of the secondary cyclone 208 enters the sedimentation tank 2010 for discharge or returns to the C slurry storage tank 2011 for recycling. The underflow slurry of the secondary cyclone 208 enters the secondary dewatering vibrating screen 207. The screened material of the secondary dewatering vibrating screen 207 is 0.074-2 mm material, which is sent to the slag yard for stacking; the fine particle material passing through the secondary dewatering screen 207 enters the C slurry storage tank 2011 for recycling or is discharged into the sedimentation tank 2010.

[0027] like Figure 3 As shown, in the configuration of the slurry storage tanks according to one embodiment of the present invention, the A slurry storage tank 301 and the B slurry storage tank 303 are directly connected via a sealing gasket 302, and the elastic sealing gasket 302 is sandwiched between the two tanks to prevent slurry leakage, the B slurry storage tank 303 and the C slurry storage tank 305 are connected via a connecting pipe 304, and the three slurry storage tanks are installed together on a base 306.

[0028] In one embodiment of the present invention, Figure 2 The slurry storage tanks 2014, 2013, and 2011 correspond to Figure 3 The slurry storage tanks 301, 303, 305 in.

[0029] The advantages of the shield machine mud water separation device and method according to the present invention include: due to the addition of a sand washer washing process at the bottom of the primary cyclone, a large amount of clay components can be separated from the sand and stone materials, which well overcomes the shortcomings of the existing mud water treatment process, specifically including:

[0030] First, the mud and water content of the gravel on the two-stage dewatering screen is greatly reduced, reaching the standard of gravel for construction, so that the slag that was originally discarded in large quantities can be recycled and reused as qualified concrete materials, which not only creates considerable economic benefits, but also protects national resources from being wasted;

[0031] Second, it greatly reduces the amount of waste soil discharged, which not only reduces transportation costs, but also saves the waste soil from occupying land around the city, and effectively reduces the environmental pollution caused by spillage and stacking during transportation;

[0032] Third, since the material falling onto the vibrating screen does not contain clay mud, the screen is not easily blocked, which improves the screening efficiency and ensures the safe and stable operation of construction production.

Claims

1. Mud-water separation equipment for mud generated by shield machine excavation operation, characterized in that include: The pre-screen (201) is used to screen the slurry from the pressure reducing box (202). The screened material of the pre-screen (201) is sent to the slag yard for storage. The material that passes through the screen of the pre-screen (201) enters the first slurry storage tank (2014) and the second slurry storage tank (2013) in sequence. A first slurry storage tank (2014) and a second slurry storage tank (2013) are interconnected, A first slurry pump (2012) and a primary cyclone (205), wherein the material in the second slurry storage tank (2013) is pumped into the primary cyclone (205) by the first slurry pump (2012); The third slurry storage tank (2011) and the sedimentation tank (2010), the overflow fine particle slurry of the primary cyclone (205) enters the third slurry storage tank (2011) for secondary separation or is returned to the second slurry storage tank (2013) for recycling or enters the sedimentation tank (2010); The sand washer (204) and the primary dewatering vibrating screen (203), the bottom flow coarse particle slurry of the primary cyclone (205) enters the sand washer (204), after being washed with water in the sand washer (204), the washed clay slurry overflows to the second slurry storage tank (2013) and enters the next cycle, and the sand and stone materials without clay after washing enter the primary dewatering vibrating screen (203); the screened materials of the primary dewatering vibrating screen (203) are sent to the slag yard for stacking; the materials passing through the screen of the primary dewatering vibrating screen (203) enter the second slurry storage tank (2013); A second slurry pump (209) and a secondary cyclone (208), the material in the third slurry storage tank (2011) is pumped into the secondary cyclone (208) by the second slurry pump (209), and the overflow fine particle slurry of the secondary cyclone (208) is discharged into the sedimentation tank (2010) or returned to the third slurry storage tank (2011) for recycling; The bottom flow slurry of the secondary dewatering vibrating screen (207) and the secondary cyclone (208) enters the secondary dewatering vibrating screen (207), and the screen material of the secondary dewatering vibrating screen (207) is sent to the slag yard for stacking; the fine particle material passing through the secondary dewatering vibrating screen (207) enters the third slurry storage tank (2011) for recycling and / or is discharged into the sedimentation tank (2010).

2. The mud-water separation equipment according to claim 1, characterized in that: The material on the first-stage dewatering vibration screen (203) is 2 to 4 mm in size. The material passing through the screen of the primary dewatering vibration screen (203) is a material with a particle size less than 2 mm. The material on the secondary dewatering vibration screen (207) is 0.074-2 mm in size.

3. The mud-water separation equipment according to claim 1, characterized in that Further including: The decompression box (202) is used to decompress the mud.

4. The mud-water separation equipment according to claim 3 is characterized in that: The material on the pre-screen (201) is sent to the slag yard for stacking; the material passing through the screen of the pre-screen (201) is sequentially sent to the first slurry storage tank (2014) and the second slurry storage tank (2013) connected thereto.

5. The mud-water separation equipment according to any one of claims 1 to 4, characterized in that: The first slurry storage tank is directly connected to the second slurry storage tank via a sealing gasket (302). The elastic sealing gasket (302) is sandwiched between the first slurry storage tank and the second slurry storage tank to prevent slurry leakage. The second slurry storage tank is connected to the third slurry storage tank via a connecting pipe (206, 304); The first slurry reservoir, the second slurry reservoir and the third slurry reservoir are mounted on a common base (306).

6. A method for separating mud and water from mud produced by shield machine excavation, characterized in that include: The slurry from the pressure reducing box (202) is screened by the pre-screen (201), the screened material of the pre-screen (201) is sent to the slag yard for stacking, and the material passing through the screen of the pre-screen (201) is sequentially entered into the first slurry storage tank (2014) and the second slurry storage tank (2013) connected to the first slurry storage tank (2014), Using a first slurry pump (2012) to pump material from the second slurry storage tank (2013) into the primary cyclone (205); The overflow fine particle slurry of the primary cyclone (205) enters the third slurry storage tank (2011) for secondary separation or returns to the second slurry storage tank (2013) for recycling or enters the sedimentation tank (2010); The coarse particle slurry of the bottom flow of the primary cyclone (205) enters the sand washer (204), the clay slurry washed out by the sand washer (204) with water overflows to the second slurry storage tank (2013) to enter the next cycle, and the sand and stone material without clay after being washed by the sand washer (204) with water enters the primary dewatering vibration screen (203); Sending out the screened material of the primary dewatering vibration screen (203); The material passing through the screen of the primary dewatering vibrating screen (203) is sent to the second slurry storage tank (2013); The material in the third slurry storage tank (2011) is pumped into the secondary cyclone (208) by the second slurry pump (209). The overflow fine particle slurry of the secondary cyclone (208) enters the sedimentation tank (2010) for discharge or returns to the third slurry storage tank (2011) for recycling. The bottom flow slurry of the secondary cyclone (208) enters the secondary dewatering vibrating screen (207), The oversize material of the secondary dewatering vibrating screen (207) is discharged, The fine particle material passing through the secondary dewatering vibrating screen (207) is sent to the third slurry storage tank (2011) for recycling and / or discharged into the sedimentation tank (2010).

7. The mud-water separation method according to claim 6, characterized in that: The material on the first-stage dewatering vibration screen (203) is 2 to 4 mm in size. The material passing through the screen of the primary dewatering vibration screen (203) is a material with a particle size less than 2 mm. The material on the secondary dewatering vibration screen (207) is 0.074-2 mm in size.

8. The mud-water separation method according to claim 6, characterized in that Further including: The slurry is decompressed using a decompression tank (202).

9. The mud-water separation method according to claim 8, characterized in that: The material on the pre-screen (201) is a material with a particle size greater than 4 mm and is sent to the slag yard for storage; the material with a particle size less than 4 mm passes through the screen of the pre-screen (201) and enters the first slurry storage tank (2014) and the second slurry storage tank (2013) connected thereto in sequence.

10. The mud-water separation method according to any one of claims 6 to 9, characterized in that: The first slurry storage tank is directly connected to the second slurry storage tank via a sealing gasket (302). The elastic sealing gasket (302) is sandwiched between the first slurry storage tank and the second slurry storage tank to prevent slurry leakage. The second slurry storage tank is connected to the third slurry storage tank via a connecting pipe (206, 304); The first slurry reservoir, the second slurry reservoir and the third slurry reservoir are mounted on a common base (306).

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