Precipitation method for changing permeable rate of mucky soil in filling area

Abstract

The invention relates to the technical field of precipitation devices and equipment, and discloses a precipitation method for changing the permeable rate of mucky soil in a filling area, which comprises the following steps: transporting solid waste, namely coal cinder, generated after coal combustion to a solid waste company for refining and screening, and screening the coal cinder; water in the filling area is drained and pumped out through a water pumping device, the part of sludge at the bottom is exposed, then the coal cinder in the first step is laid on mucky soil, and the coal cinder and the mucky soil are evenly stirred according to the volume ratio not smaller than 1: 3; by stirring coal cinder and sludge and adopting the principle of combining a blind pipe and a pneumatic precipitation device, the bearing capacity of a mixture foundation is enhanced by increasing the permeable rate of the mixture, absorbing a large amount of water in the mixture and solidifying the mixture in a water-deficient manner, and the design requirement is met; power is provided through pressure, damage caused by fine sand and corrosive water to the water pump can be effectively avoided, the service life of the device is prolonged, and the blind pipe is made of degradable materials and cannot pollute the environment.

Description

Technical Field

[0001] The invention relates to the technical field of precipitation device equipment, in particular to a precipitation method for changing the water permeability of silt soil in a fill area. Background Art

[0002] The silt soil in the fill area needs to be treated. If a pump is used directly to pump water, the water in the silt will be difficult to be sucked out. In this case, not only will a large amount of silt clog the filter screen and cause drainage difficulties, but if a large amount of silt is sucked out, fine sand smaller than the diameter of the filter screen can enter the negative pressure chamber and eventually enter the water pump, which will cause damage to the seals or rotating structures of the water pump. Moreover, the water in the saline-alkali land is corrosive. Even if the most advanced graphene seals are used, the water pump can only be used for 2-3 months when working 24 hours a day, and the stainless steel impeller can only be used for 7-9 months, which will cause corrosion or damage to the water pump. The water pump needs to be replaced frequently, resulting in increased costs.

[0003] Document CN202410297777 discloses a drainage well device that uses positive and negative pressure to address suction range limitations. The device includes a hollow water-permeable pipe, a water-collecting negative pressure tank, a compressed air storage tank, and a positive- and negative-pressure drainage all-in-one. The hollow water-permeable pipe contains a vertical outlet pipe and an explosion-proof air pipe a. The positive- and negative-pressure drainage all-in-one includes a centrifugal drainage pump, an oil-free air compressor head, and a negative-pressure explosion-proof pipe. The hollow water-permeable pipe is provided with water holes, and a water-permeable filter is provided on the periphery of the hollow water-permeable pipe. This structure makes it difficult to extract water from the silt when pumping water from a silt environment. Long-term use not only damages the device but also reduces its service life.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] In order to solve the above problems, the present invention discloses a precipitation method for changing the permeability of silt soil in the backfill area. The method mixes coal slag and silt, adopts the principle of combining blind pipes with pneumatic precipitation devices, increases the permeability of the mixture, absorbs a large amount of water from the mixture, and solidifies the mixture due to lack of water, thereby enhancing the bearing capacity of the mixture foundation and meeting the design requirements. The use of pressure to provide power can effectively avoid damage caused by fine sand and corrosive water, and extend the service life of the device. The blind pipe is made of degradable material and will not cause pollution to the environment.

[0006] The technical solution of the present invention is: a precipitation method for changing the water permeability of silt soil in a fill area, comprising the following steps: Step 1: transport the solid waste generated after coal combustion, namely coal slag, to the solid waste company for screening and treatment; Step 2: Drain the surface water in the fill area through a pumping device to remove the bottom silt, and then lay the coal slag in step 1 on the silty soil, wherein the coal slag and silty soil are mixed evenly at a volume ratio of not less than 1:3; Step 3: An opening is provided at the bottom of the vertical water pumping pipe of the pumping device, and the vertical water pumping pipe is placed in a degradable water-permeable blind pipe. A degradable water-permeable filter is wrapped around the outside of the degradable water-permeable blind pipe. The bottom and the connection are tied tightly with wire, and a sealing clay layer is added to the pre-buried outlet of the vertical water pumping pipe; Step 4: bury the vertical water pumping pipe with the degradable water-permeable blind pipe and the degradable water-permeable filter in the mixture of silt and coal slag to the pre-buried depth required for precipitation, with the top of the vertical water pumping pipe exposed above the ground; Step 5: Connect the part of the vertical water pipe exposed above the ground to the horizontal water collecting pipe and then to the water inlet of the negative pressure tank; Step 6: Install a one-way valve between the negative pressure chamber and the drainage chamber. The oil-free vacuum unit starts working. The negative pressure generated passes through the three-way pneumatic ball valve and is connected to one end of the negative pressure chamber to continuously extract the negative pressure, pumping the water in the light well point dewatering well into the negative pressure chamber. When the water level in the negative pressure chamber reaches the upper limit position of the electric contact switch, the electric contact switch sends a signal to the control box, which sends a signal to the three-way pneumatic ball valve to switch the air circuit of the three-way pneumatic ball valve to the drainage chamber. Step 7: When the water level in the drainage chamber reaches the upper limit of the electric contact switch, the electric contact switch sends a signal to the control box, which sends a signal to the three-way pneumatic ball valve, which switches the air circuit to the negative pressure chamber again; Step 8: After the control box completes the switching action of the three-way pneumatic ball valve, it delays 4-6 seconds to open the two-way pneumatic ball valve, injecting the compressed air in the compressed air storage tank into the drainage tank, and draining the accumulated water in the drainage tank into the designated drainage ditch or sedimentation tank through the drain pipe; Step 9: When the accumulated water in the drainage tank is drained to the lower limit of the electric contact switch, the two-way pneumatic ball valve is closed and the drainage is stopped. When the compressed air pressure in the compressed air storage tank is lower than 0.6Mpa, the oil-free air compressor unit will automatically start to supply compressed air to the compressed air storage tank until it automatically stops at 0.8Mpa to ensure that there is sufficient pressure in the compressed air storage tank to drive the pneumatic ball valve and the drainage action; Step 10: When the drainage operation is being carried out in the drainage chamber, the negative pressure chamber is also absorbing water at the same time, and the operation is carried out in a cycle to ensure that the water in the light well point precipitation well is continuously pumped out.

[0007] Preferably, the particle size of the coal slag is 1-3 mm. After the coal slag and sludge are stirred, the permeability coefficient of the coal slag and sludge is increased from the original <0.001 m / day to not less than 0.01 m / day.

[0008] By adopting the above technical solution, the coal slag is broken into small particles, which are just mixed with the sludge. The coal slag absorbs a large amount of water in the sludge, making it convenient for drainage in the later stage.

[0009] Preferably, the depth of the opening at the bottom of the vertical pumping pipe is 0.7-0.9 m, and the thickness of the sealing clay layer is more than 1 meter.

[0010] By adopting the above technical solution and providing a sealing clay layer on the top of the vertical pumping pipe, the sealing performance of the entire vertical pipeline can be increased, thereby improving the overall drainage efficiency.

[0011] Preferably, the pre-buried depth is more than 2 meters, and the height of the vertical pumping pipe exposed above the ground is 0.2-0.4m.

[0012] By adopting the above technical solution, the part of the vertical water pumping pipe exposed above the ground can be connected to the horizontal water collecting pipe.

[0013] Preferably, in step seven, the three-way pneumatic ball valve switches the air circuit back to the negative pressure chamber, and the accumulated water in the negative pressure chamber is transferred to the drainage chamber.

[0014] Preferably, the drainage tank and the electric contact switch are both located inside the unit, the three-way pneumatic ball valve is respectively connected to the drainage tank, the negative pressure tank and the oil-free vacuum head group, the drainage tank is connected to the compressed air storage tank through the two-way pneumatic ball valve, and an oil-free air compressor unit is provided under the compressed air storage tank.

[0015] Preferably, a one-way valve is provided at the bottom between the negative pressure chamber and the drainage chamber, and the bottom of the drainage chamber is connected to a drainage pipe through the drainage pipe one-way valve, and the drainage pipe is located at the bottom of the entire unit.

[0016] By adopting the above technical solution, the one-way valve and the drain pipe one-way valve can effectively prevent water from flowing back, so that the water in the unit can only be discharged toward the drain pipe.

[0017] Preferably, a control electrical box is provided on one side of the oil-free air compressor unit, and a cooling fan is also provided on one side of the unit for cooling the unit.

[0018] By adopting the above technical solution and the cooling fan, the operating temperature of the entire unit is adjusted, effectively extending the service life of the unit.

[0019] The benefits of the present invention are as follows: 1. The present invention adds small-particle coal slag to the silt to mix the coal slag and the silt. The coal slag can absorb the moisture in the silt, making it convenient for the pumping device to drain the water, so that the mixture is solidified due to lack of water, thereby enhancing the bearing capacity of the mixture foundation, meeting the design requirements, greatly improving the permeability of the silt soil, reducing the cost of silt treatment, and achieving the construction standards of normal soil through strong compaction and dynamic consolidation construction.

[0020] 2. The present invention solves the problem that the sealing ring and blades produced by the previous water pump are easily damaged. It uses positive and negative pressure air sources as the power source, has no rotating structure, no mechanical seal, simple structure, and is not easy to damage. When used in saline-alkali areas, even if the water is corrosive, it will not be damaged.

[0021] 3. The application of the oil-free vacuum unit in the present invention makes the equipment run stably with extremely low failure rate, eliminates the equipment maintenance cost and is energy-efficient and efficient, saving more than 60% of electricity consumption compared with traditional vacuum pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the water pumping pipe of the present invention; Figure 2 This is a schematic structural diagram of the vertical water pumping pipe of the present invention; Figure 3 It is a structural schematic diagram of the present invention.

[0023] Among them: 1. Vertical pumping pipe, 2. Sealing clay layer, 3. Degradable water-permeable blind pipe, 4. Degradable water-permeable filter, 5. Horizontal water collection pipe, 6. Tie wire, 7. Negative pressure chamber water inlet, 701, electric contact switch, 8. Negative pressure chamber, 9. Drain chamber, 10. Three-way pneumatic ball valve, 11. Two-way pneumatic ball valve, 12. Compressed air storage tank, 13. Oil-free air compressor unit, 14. One-way valve, 15. Drain pipe one-way valve, 16. Drain pipe, 17. Oil-free vacuum head unit, 18. Control electrical box, 19. Cooling fan, DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] like Figure 1-3 As shown, a precipitation method for changing the water permeability of silt soil in a fill area includes the following steps: Step 1: transport the solid waste generated after coal combustion, namely coal slag, to the solid waste company for screening and treatment; Step 2: Drain the surface water in the fill area through a pumping device to remove the bottom silt, and then lay the coal slag in step 1 on the silty soil, wherein the coal slag and silty soil are mixed evenly at a volume ratio of not less than 1:3; Step 3: An opening is provided at the bottom of the vertical water pumping pipe 1 of the pumping device, and the vertical water pumping pipe 1 is placed in the degradable water-permeable blind pipe 3. The degradable water-permeable filter 4 is wrapped around the outside of the degradable water-permeable blind pipe 3. The bottom and the connection are tied with a wire 6. A sealing clay layer 2 is added to the pre-buried outlet of the vertical water pumping pipe 1; Step 4: bury the vertical water pumping pipe with the degradable water-permeable blind pipe 3 and the degradable water-permeable filter 4 in the mixture of silt and coal slag to the pre-buried depth required for precipitation, with the top of the vertical water pumping pipe 1 exposed above the ground; Step 5: Connect the part of the vertical water pumping pipe 1 exposed above the ground to the horizontal water collecting pipe 5 and then connect it to the water inlet of the negative pressure tank 8; Step 6: A one-way valve 14 is installed between the negative pressure chamber 8 and the drainage chamber 9. The oil-free vacuum unit 17 starts working. The negative pressure generated passes through the three-way pneumatic ball valve 10, which is connected to one end of the negative pressure chamber 8 to continuously extract the negative pressure, and pump the water in the light well point dewatering well into the negative pressure chamber 8. When the water level in the negative pressure chamber 8 reaches the upper limit position of the electric contact switch 701, the electric contact switch 701 sends a signal to the control box 18, and the control box 18 sends a signal to the three-way pneumatic ball valve 10, switching the air circuit of the three-way pneumatic ball valve 10 to the drainage chamber 9; Step 7: When the water level in the drainage chamber 9 reaches the upper limit of the electric contact switch 701, the electric contact switch 701 sends a signal to the control circuit 18, and the control circuit 18 sends a signal to the three-way pneumatic ball valve 10, and the three-way pneumatic ball valve 10 switches the air circuit to the negative pressure chamber 8 again; Step 8: After the control box 18 completes the switching action of the three-way pneumatic ball valve 10, it delays 4-6 seconds to open the two-way pneumatic ball valve 11, injecting the compressed air in the compressed air storage tank 12 into the drainage chamber 9, and draining the accumulated water in the drainage chamber 9 to the designated drainage ditch or sedimentation tank through the drainage pipe 16; Step 9: When the accumulated water in the drainage chamber 9 is drained to the lower limit of the electric contact switch 701, the two-way pneumatic ball valve 11 is closed and the drainage is stopped. When the compressed air pressure in the compressed air storage tank 12 is lower than 0.6 MPa, the oil-free air compressor unit 13 will automatically start to supply compressed air to the compressed air storage tank 12 until it automatically stops at 0.8 MPa, ensuring that there is sufficient pressure in the compressed air storage tank 12 to drive the pneumatic ball valve and the drainage action; Step 10: When the drainage chamber 9 is draining, the negative pressure chamber 8 is also absorbing water at the same time, and the operation is circulated to ensure that the water in the light well point precipitation well is continuously pumped out.

[0026] The particle size of coal slag is 1-3mm. After the coal slag and silt are mixed, the permeability coefficient of the coal slag and silt is increased from the original <0.001 m / day to not less than 0.01 m / day. The coal slag is beaten into small particles and mixed with the silt. The coal slag absorbs a large amount of water in the silt, which is convenient for drainage in the later stage.

[0027] The depth of the opening at the bottom of the vertical pumping pipe 1 is 0.7-0.9m, the thickness of the sealing clay layer 1 is more than 1 meter, and a sealing clay layer 2 is provided on the top of the vertical pumping pipe 1, which can increase the sealing of the entire vertical pipeline, improve the overall drainage efficiency, and effectively improve the precipitation effect of silt soil. During the precipitation process, the water in the permeable blind pipe can be quickly discharged and negative pressure can be formed in the permeable blind pipe, accelerating the groundwater to converge and discharge to the bottom of the vertical pumping pipe, greatly improving the precipitation effect. The permeable blind pipe 3 and permeable filter 4 used are made of environmentally friendly and degradable materials. In theory, they can be degraded in 6-8 months and will not cause construction pollution.

[0028] The pre-buried depth is more than 2 meters, and the height of the vertical pumping pipe 1 exposed to the ground is 0.2-0.4m. The part of the vertical pumping pipe 1 exposed to the ground can just be connected to the horizontal water collecting pipe 5.

[0029] In step seven, the three-way pneumatic ball valve 10 switches the air path back to the negative pressure chamber 8 , and the accumulated water in the negative pressure chamber 8 is transferred to the drainage chamber 9 .

[0030] The drainage chamber 9 and the electric contact switch 701 are both located inside the unit. The three-way pneumatic ball valve 10 is respectively connected to the drainage chamber 9, the negative pressure chamber 8 and the oil-free vacuum head group 17. The drainage chamber 9 is connected to the compressed air storage tank 12 through the two-way pneumatic ball valve 11. An oil-free air compressor group 13 is provided under the compressed air storage tank 12.

[0031] A one-way valve 14 is provided at the bottom between the negative pressure chamber 8 and the drainage chamber 9. The bottom of the drainage chamber 9 is connected to a drain pipe 16 through a drain pipe one-way valve 15. The drain pipe 16 is located at the bottom of the entire unit. The one-way valve 14 and the drain pipe one-way valve 15 can effectively prevent water backflow, so that the water in the unit can only be discharged toward the drain pipe 16.

[0032] A control electrical box is provided on one side of the oil-free air compressor unit 13, and a cooling fan is also provided on one side of the unit for cooling the unit. The cooling fan 19 regulates the operating temperature of the entire unit and effectively extends the service life of the unit.

[0033] Those skilled in the art will understand that the embodiments of the present invention described above and shown in the accompanying drawings are intended to be illustrative only and are not intended to limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A precipitation method for changing the water permeability of muddy soil in a backfill area, characterized in that: The following steps are involved: Step 1: transport the solid waste generated after coal combustion, namely coal slag, to a solid waste company for screening and treatment; Step 2: drain the surface water in the filling area through a pumping device to remove the bottom silt, and then lay the coal slag in step 1 on the silty soil, wherein the coal slag and the silty soil are mixed evenly at a volume ratio of not less than 1:3; Step 3: An opening is provided at the bottom of the vertical water pumping pipe of the water pumping device, and the vertical water pumping pipe is placed in a degradable water-permeable blind pipe, and a degradable water-permeable filter is wrapped outside the degradable water-permeable blind pipe, and the bottom and the connection are fastened with a wire tie, and a sealing clay layer is added to the pre-buried outlet of the vertical water pumping pipe; Step 4: bury the vertical water pumping pipe with the degradable water-permeable blind pipe and the degradable water-permeable filter in the mixture of sludge and coal slag at the pre-buried depth required for precipitation, with the top of the vertical water pumping pipe exposed above the ground; Step 5: Connect the part of the vertical water pumping pipe exposed above the ground to the horizontal water collecting pipe and connect it to the water inlet of the negative pressure tank; Step 6: A one-way valve is installed between the negative pressure bin and the drainage bin. The oil-free vacuum unit starts to work. The negative pressure generated passes through the three-way pneumatic ball valve, connected to one end of the negative pressure bin to continuously extract the negative pressure, and the water in the light well point dewatering well is pumped into the negative pressure bin. When the water level in the negative pressure bin reaches the upper limit position of the electric contact switch, the electric contact switch sends a signal to the control box, and the control box sends a signal to the three-way pneumatic ball valve to switch the three-way pneumatic ball valve gas circuit to the drainage bin; Step 7: When the water level in the drainage bin reaches the upper limit of the electric contact switch, the electric contact switch sends a signal to the control box, and the control box sends a signal to the three-way pneumatic ball valve, and the three-way pneumatic ball valve switches the air circuit to the negative pressure bin again; Step 8: After the control box completes the switching action of the three-way pneumatic ball valve, it delays 4-6 seconds to open the two-way pneumatic ball valve, injects the compressed air in the compressed air storage tank into the drainage bin, and drains the accumulated water in the drainage bin to the designated drainage ditch or sedimentation tank through the drainage pipe; Step 9: When the accumulated water in the drainage bin is drained to the lower limit of the electric contact switch, the two-way pneumatic ball valve is closed to stop draining. When the compressed air pressure in the compressed air storage tank is lower than 0.6Mpa, the oil-free air compressor unit will automatically start to supply compressed air to the compressed air storage tank until it stops automatically at 0.8Mpa, ensuring that there is sufficient pressure in the compressed air storage tank to drive the pneumatic ball valve and drain the water; Step 10: While the drainage tank is draining water, the negative pressure tank is also absorbing water at the same time, and the operation is carried out in a cycle to ensure that the water in the light well point precipitation well is continuously pumped out.

2. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: The particle size of the coal slag is 1-3 mm. After the coal slag and sludge are stirred, the permeability coefficient of the coal slag and sludge is increased from the original <0.001 m / day to not less than 0.01 m / day.

3. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: The depth of the opening at the bottom of the vertical pumping pipe is 0.7-0.9 m, and the thickness of the sealing clay layer is more than 1 m.

4. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: The pre-buried depth is more than 2 meters, and the height of the vertical pumping pipe exposed above the ground is 0.2-0.4m.

5. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: In step 7, the three-way pneumatic ball valve switches the air circuit back to the negative pressure chamber (8), and the accumulated water in the negative pressure chamber is transferred to the drainage chamber.

6. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: The drainage bin and electric contact switch are both located inside the unit; the three-way pneumatic ball valve is respectively connected to the drainage bin, negative pressure bin and oil-free vacuum head group; the drainage bin is connected to a compressed air storage tank via a two-way pneumatic ball valve; an oil-free air compressor unit is provided below the compressed air storage tank.

7. A precipitation method for changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: A one-way valve is provided at the bottom between the negative pressure chamber and the drainage chamber. The bottom of the drainage chamber is connected to a drainage pipe through a drainage pipe one-way valve. The drainage pipe is located at the bottom of the entire unit.

8. The method for reducing water loss by changing the water permeability of muddy soil in a backfill area according to claim 1, characterized in that: A control electric box is provided on one side of the oil-free air compressor unit, and a cooling fan is also provided on one side of the unit for cooling the unit.

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