A kind of recyclable slag drainage pool structure and slag drainage method

Abstract

The invention discloses a recyclable slag drainage pool structure and a slag drainage method. The slag drainage pool structure includes a drainage pool and an electro-osmosis controller. The drainage pool uses a steel pipe pile continuous wall as the side wall of the drainage pool. The inner side wall of the drainage pool is fixed with a plurality of vertically arranged plastic drainage boards. The bottom plate of the drainage pool includes a flexible water-permeable resin sand filter layer, a galvanized wire mesh layer, a drainage board layer and a solidified soil layer in order from top to bottom. The plastic drainage board is connected to the drainage blind ditch through the drainage board layer. A plurality of steel pipe piles on the side wall of the drainage pool are hollowed out as a water collection well, which is connected to the drainage blind ditch. The water collection well is connected to a high-power vacuum pump and a water pump through a pipeline. The anode of the electro-osmosis controller is connected to a hollow iron ball suspended on the slag surface in the drainage pool, and the cathode is connected to the steel pipe pile continuous wall and the galvanized wire mesh layer. The equipment of the invention is simple, recyclable and reusable, has low operating cost, high slag drainage efficiency, and can greatly reduce the transportation and treatment costs of slag.

Description

Technical Field

[0001] The invention belongs to the technical field of slag treatment, and in particular relates to a recyclable slag drainage pool structure and a slag drainage method. Background Art

[0002] Rail transit construction has promoted the development of the urban economy, solved the problem of urban traffic congestion, and improved people's travel conditions, but it has also brought a series of environmental and safety problems. Among them, waste disposal is the most prominent problem faced in the subway construction process.

[0003] Studies have shown that shield tunneling waste can save at least 44% of treatment costs after dehydration.

[0004] At present, many types of dehydration equipment have been developed in China, such as plate and frame filter press, belt filter press, horizontal screw centrifuge, vacuum belt filter press, drum dryer, infrared dryer, etc. The use of these equipment to treat slag has a certain effect, but there are also many problems:

[0005] 1. High investment cost. Both centrifuges and filter presses are large-scale equipment with high initial investment cost and operating expenses.

[0006] 2. The equipment occupies a large area. The starting point and slag outlet of shield construction are generally set at subway stations, which are generally located near road intersections. The construction site is limited and there is usually no space to place the entire set of equipment.

[0007] 3. The processing efficiency is low. Even if a 1000m2 filter press is used, only a dozen cubic meters of dry soil can be processed per hour. When the shield machine is in normal construction, it can excavate one ring every half an hour, generating 60m3 of slag. Therefore, when a filter press is used for processing, a large amount of slag will be accumulated.

[0008] In short, the existing slag dewatering technology has low processing efficiency and high on-site processing costs, and the speed of transporting the accumulated slag has become an important factor restricting the construction speed of shield projects. Summary of the invention

[0009] In order to solve the above technical problems, the present invention provides a recyclable slag drainage pool structure and a slag drainage method which have a simple and compact structure, small footprint, low cost, high efficiency in slag dehydration treatment, low impact on the environment, and equipment that can be recycled and reused.

[0010] The technical solution adopted by the present invention is: a recyclable slag drainage pool structure, including a drainage pool and an electric osmosis controller;

[0011] The drainage pool adopts a steel pipe pile continuous wall as the side wall of the drainage pool, and a number of vertically arranged plastic drainage boards are fixed on the inner wall of the drainage pool. The bottom plate of the drainage pool includes a flexible resin sand filter layer, a galvanized wire mesh layer, a drainage board layer and a solidified soil layer from top to bottom; a drainage blind ditch interconnected with the drainage board is provided on the upper part of the solidified soil layer.

[0012] Several steel pipe piles on the side wall of the drainage pool are hollowed out to serve as water collection wells. Water holes are provided on the side wall of the water collection wells, and the water holes connect the water collection wells with the drainage blind ditch. The water collection wells are connected to vacuum pumps and pumping machines through pipelines.

[0013] The anode of the electric osmosis controller is connected to a hollow iron ball suspended on the slag surface in the central area of ​​the drainage pool, while the cathode is connected to the steel pipe pile continuous wall and the galvanized wire mesh layer.

[0014] In the above-mentioned recyclable slag drainage pool structure, the flexible resin sand water filter layer is cast or paved, and its thickness is 0.5-2.0cm; the galvanized wire mesh layer is electrically connected to the steel pipe piles on the side wall of the drainage pool; the upper end of the plastic drainage board is 3-5cm lower than the top surface of the drainage pool, and the lower end is fixed between the flexible resin sand water filter layer and the galvanized wire mesh layer; a permeable pipe is provided in the drainage blind ditch.

[0015] The above-mentioned recyclable slag drainage pool structure includes two rectangular drainage pools, which share a side wall; the steel pipe piles at the four corners of the drainage pool are hollowed out to serve as water collection wells, and the depth of the water collection well is greater than the depth of the drainage pool; there is a sealing cover on the top of the water collection well, and solidified soil is poured on the top of the sealing cover. There are also exhaust pipes and water pumping pipes in the water collection well, and the upper ends of the exhaust pipes and water pumping pipes pass through the sealing cover and are connected to the vacuum pump and the water pump.

[0016] In the above-mentioned recyclable slag drainage pool structure, the bottom of the water collection well is sealed with cement mortar or solidified soil, and the depth of the water collection well is 1.5-2 times the depth of the drainage pool.

[0017] In the above-mentioned recyclable slag drainage pool structure, a gantry crane track is provided on both sides of the drainage pool, and the gantry crane track is arranged along the long side of the drainage pool; the side wall of the long side of the drainage pool adopts a double-row steel pipe pile structure, and the number of steel pipe piles in the rear row is less than that in the front row.

[0018] In the above-mentioned recyclable slag drainage pool structure, the length of the steel pipe piles in the steel pipe pile continuous wall is 6.0~10.0m, and the diameter of the steel pipe piles is 0.6~1.0m; two adjacent steel pipe piles are connected by a mother buckle and a sub-buckle; the mother buckle is installed on one of the two adjacent steel pipe piles, and the sub-buckle is installed on the other of the two adjacent steel pipe piles through the sub-buckle connecting plate; the mother buckle is provided with a circular groove and a circular water-stop cavity, the water-stop cavity is located outside the groove, and the sub-buckle is a circular tubular structure, which is inserted into a groove of the mother buckle.

[0019] A method for draining slag using the above-mentioned recyclable slag drainage pool structure comprises the following steps:

[0020] 1) Build a slag drainage pool structure, install a vacuum pump and a water pump at the water collection well, and install a water level sensor in the water collection well to automatically extract air and water from the closed water collection well through pipelines:

[0021] 2) Load the shield muck that needs to be dehydrated into a drainage pool in the muck drainage pool structure;

[0022] 3) When the slag is leveled or covers the entire bottom of the drainage pool, turn on the vacuum pump (preferably a high-power vacuum pump with a vacuum volume of 50 liters / second), continue to load the slag, and drain the water under vacuum negative pressure;

[0023] 4) When the drainage pool is more than half loaded with slag, place a hollow iron ball connected to the anode of the electric osmosis controller in the center of the slag pool, connect the cathode of the electric osmosis controller to the steel pipe pile, turn on the electric osmosis controller, and continue to load the slag until it is full and keep the hollow iron ball above the slag surface;

[0024] 5) When the water level sensor gives a signal, that is, the water level in the drainage blind ditch is about to be full, the vacuum pump is automatically turned off and the pump is turned on to pump water from the water collection well; after the pumping is completed, the pump is automatically turned off and the vacuum pump is turned on again to pump air;

[0025] 6) When the surface soil moisture content in the soil pit is close to the plastic limit of the soil or the soil has sufficient bearing capacity, use a frog-type rammer, a tamping machine or a hammer to vibrate and load the soil;

[0026] 7) Keep the electric osmosis controller turned on until the slag enters the hard plastic state;

[0027] 8) Turn off the vacuum pump, water pump and electro-osmosis controller and discharge the slag at the same time, and use a high-pressure water gun to rinse the inner surface of the slag drainage pool.

[0028] 9) Repeat the above steps 2) to 8) for the other drainage pool of the slag drainage pool structure, and keep the two drainage pools in a continuous slag loading and slag discharging state.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The side walls and bottom plates of conventional shield slag pits are made of waterproof reinforced concrete structures, which are difficult to recycle after use, and even if they are recycled, their value is not great; the slag pit of the present invention not only has all the functions of a traditional slag pit, but also can achieve drainage and dehydration during loading and unloading, reducing the transportation cost of the slag and the treatment cost of the transported slag.

[0031] 2. All equipment used to construct the drainage pool of the present invention can be recycled and reused.

[0032] 3. The inner cavity bottom plate of the slag drainage pool of the present invention is assembled and assembled with recyclable permeable materials, and the bottom surface layer is a permeable flexible resin sand layer, which is prepared by hydrophilic resin, flexible resin and fine-grained silica sand, so that the hydrophilicity and crack resistance of the permeable structure are greatly improved, thereby ensuring that the surface of the permeable structure is dense, permeable and less blocked. On the surface of the permeable structure, the surface tension of water molecules is destroyed by the hydrophilicity of the resin, and the permeability effect is enhanced.

[0033] 4. The side walls of the slag drainage pool of the present invention are provided with relatively dense plastic drainage boards. When the drainage system generates negative pressure drainage after the vacuum pump and the water pump pump water, it is beneficial to drain the slag in the horizontal direction.

[0034] 5. The present invention uses an electric osmosis controller to form a pulse electromagnetic field in the drainage system and the slag in the pool cavity. Under the action of the electromagnetic field, the ionosphere on the surface of the slag particles is damaged to a certain extent, part of the bound water is transformed into free water, and the polar water molecules will actively move toward the permeable structure layer of the drainage system, while the adhesion of the slag particles to the permeable structure surface is weakened, thereby improving the drainage efficiency.

[0035] 6. The present invention adopts hollowed-out supporting structure steel pipe piles as water collection wells, realizing dual uses of one pile and reducing the workload of setting up water collection wells. At the same time, a double-row pile supporting structure is adopted in the long side direction of the drainage pool, and the gantry crane track is arranged on the double-row pile structure. The double-row pile structure and the soil are combined into a composite pile foundation to provide sufficient foundation bearing capacity for the gantry crane track and is beneficial to the stability of the side wall of the drainage pool.

[0036] 7. The side wall of the slag pool of the present invention also has a water-stopping function. By injecting a low-strength and high-viscosity water-soluble polymer aqueous solution into the water-stopping cavity of the steel pipe pile female fastener, the water-stopping function of the steel pipe pile continuous wall can be achieved.

[0037] 8. The moisture content of the slag obtained by the present invention can be reduced to below the plastic limit, which can greatly reduce the transportation cost. Sandy slag can be directly screened to obtain valuable sand and clay; sticky slag can be used as roadbed filler or used to make clay bricks, etc., realizing the recycling of slag resources.

[0038] 9. The present invention also has the advantages of simple structure, convenient implementation, low one-time investment and subsequent maintenance and operation costs, and high efficiency in waste soil treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a partial top view of the side wall of the recyclable slag drainage pool structure of the present invention.

[0040] Figure 2 It is a top view of the recoverable muck drainage pool structure of the present invention.

[0041] Figure 3 yes Figure 2 AA cross-sectional view in.

[0042] Figure 4 yes Figure 2 Cross-sectional view of BB in FIG.

[0043] In the figure: 1—water collection well; 2—steel pipe pile; 3—fastener connecting plate; 4—fastener; 5—female fastener; 6—water stop cavity; 7—drainage blind ditch; 8—gantry crane track; 9—plastic drainage board; 10—water collection well sealing cover; 11—solidified soil layer; 12—vacuum pump exhaust pipe of water collection well; 13—water pump suction pipe of water collection well; 14—foundation soil layer; 15—shield slag; 16—flexible resin sand filter layer; 17—galvanized wire mesh layer; 18—drainage storage and drainage board; 19—permeable pipe; 20—elevation line of the top surface of the drainage tank bottom plate. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] like Figure 1-4 As shown, the recyclable soil drainage pool structure of the present invention includes two rectangular drainage pools and an electro-osmosis controller. The two drainage pools share a side wall to form a sun-shaped arrangement structure. The drainage pool uses a steel pipe pile continuous wall as the side wall of the drainage pool. The length of the steel pipe pile in the steel pipe pile continuous wall is 6.0~10.0m, and the diameter of the steel pipe pile is 0.6~1.0m. The two adjacent steel pipe piles are connected by a mother buckle 5 and a sub-buckle 4; the mother buckle 5 is installed on one of the two adjacent steel pipe piles, and the sub-buckle 4 is installed on the other of the two adjacent steel pipe piles through the sub-buckle connecting plate 3. The mother buckle 5 is provided with a circular groove and a circular water-stopping cavity 6, and the water-stopping cavity 6 is located outside the groove. The sub-buckle 4 is a circular tubular structure, and the sub-buckle 4 is inserted into the groove of the mother buckle 5 to achieve the connection of the two adjacent steel pipe piles.

[0046] The steel pipe piles at the four corners of each drainage pool are hollowed out to serve as a water collection well 1. The bottom of the water collection well 1 is sealed with cement mortar or solidified soil, and the top of the water collection well 1 is provided with a sealing cover 10, and solidified soil is poured on the top of the sealing cover 10. An air extraction pipe 12 and a water extraction pipe 13 are provided in the water collection well 1, and the upper ends of the air extraction pipe 12 and the water extraction pipe 13 pass through the sealing cover 10 and are respectively connected to the vacuum pump and the water pump outside the drainage pool. The depth of the water collection well 1 is 1.5-2 times the depth of the drainage pool.

[0047] In order to reduce the workload of earth excavation and precipitation, the top of the side wall of the drainage pool is about 1.0m above the ground; in order to facilitate slag loading and discharging, gantry crane tracks 8 are arranged on both sides of the drainage pool along the long side direction of the drainage pool. To ensure the stability of the side wall of the drainage pool, the foundation of the gantry crane track 8 has sufficient foundation bearing capacity. The side wall of the drainage pool in the long side direction adopts a double-row pile structure, and the number of steel pipe piles 2 in the rear row is less than that in the front row, and the pile top elevation is about 1.0m lower than the pile top elevation of the front row of steel pipe piles 2.

[0048] Under the bottom plate of the drainage pool is the foundation soil layer 14. From bottom to top, the bottom plate of the drainage pool is a solidified soil layer 11 with a thickness of 0.8m, a drainage plate 18, a galvanized wire mesh layer 17 and a flexible resin sand filter layer 16. The upper part of the solidified soil layer 11 is provided with a grid-shaped drainage blind ditch 7. The cross-sectional size of the drainage blind ditch 7 is 0.5m×0.5m. A permeable pipe 19 is buried in the drainage blind ditch 7, and the space around the permeable pipe 19 and the drainage blind ditch 7 is filled with coarse sand.

[0049] The galvanized wire mesh layer 17 is spot welded to the steel pipe piles at the periphery. A number of plastic drainage boards 9 are vertically fixed to the surface of the steel pipe piles on the inner side wall of the drainage pool, with an average of 1-2 for each steel pipe pile. The upper end of the plastic drainage board 9 is fixed 3-5 cm below the top surface of the drainage pool, and the lower end is fixed between the flexible resin sand filter layer 16 and the galvanized wire mesh layer 17.

[0050] The flexible resin sand filter layer 16 is made of a mixture of fine sand and resin, and the fine sand is preferably silica sand with a particle size of 0.07mm-1.5mm. The resin used is a mixture of ME-2 type water-based epoxy resin, polyurethane modified epoxy resin and polysulfone modified epoxy resin. The flexible resin sand filter layer 16 is cast on site by taking a mixture of resin, curing agent TX-5501 and silica sand in a certain weight ratio, or it can be prefabricated and then paved on site, and its thickness is preferably 0.5-2.0cm. If the on-site casting method is adopted, a layer of geotextile filter cloth should be laid before casting.

[0051] The anode connection of the electro-osmosis controller is placed on the slag surface in the center of the drainage pool, and its cathode is connected to the steel pipe pile 2 in the side wall of the drainage pool.

[0052] The method for draining slag soil of the present invention comprises the following steps:

[0053] 1) Construct a recyclable soil drainage pool structure, install a vacuum pump and a water pump at the water collection well, and install an electric osmosis controller; the construction process of the soil drainage pool structure is:

[0054] A. Level the site and draw the outline of the drainage pool layout according to the design drawings;

[0055] B. Drive steel pipe pile component units in sequence along the plan layout outline of the muck drainage pool to form a steel pipe pile continuous wall. The top surface of the steel pipe pile continuous wall is 1.0m above the ground. The top surface elevation of the rear row of steel pipe piles 2 and their connecting plates 3 in the double-row pile part is flush with the ground;

[0056] C. Excavate the soil inside the drainage pool, with the over-excavation depth being 0.9m. If necessary, measures can be taken to lower the groundwater level;

[0057] D. pouring a 0.8m thick premixed fluidized solidified soil, i.e., solidified soil layer 11, at the bottom of the slag drainage pool. The premixed fluidized solidified soil is a solidified mixture made of soil obtained locally as the main material, ordinary silicate cement and water glass as the soil solidifying agent as the secondary materials, and water and foaming agent required for fluidity and hydration reaction process, after stirring;

[0058] E. Dig a drainage blind ditch 7 with a cross-section of 0.5×0.5m at the position indicated in the design drawing, and put in a permeable pipe 19, which is a bridge-type water filter pipe with an outer diameter of 0.40m; remove the soil in the inner cavity of the steel pipe pile 2 serving as the water collection well 1, and use the above-mentioned premixed fluidized solidified soil to seal the bottom, with a thickness of 0.5m, and then open a hole at the position corresponding to the bridge-type water filter pipe in the drainage blind ditch 7, with a diameter of 0.4m, to connect and dock with the permeable pipe 19;

[0059] F. Fill and compact the blind drainage ditch 7 with coarse sand and gravel, lay permeable concave-convex plastic drainage board 18, and then lay galvanized wire mesh upwards. The periphery of the galvanized wire mesh is fixed to the steel pipe pile 2 or the connecting plate 3 by spot welding;

[0060] G. Install and fix the plastic drainage board 9 on the steel pipe pile 2 or the surface of the connecting plate 3 on the side wall of the drainage pool, and fix its lower end on the galvanized wire mesh;

[0061] H. Laying or pouring a flexible resin sand filter layer16.

[0062] I. Install a vacuum pump, a water pump, an air extraction pipe 12 and a water extraction pipe 13. The lower end of the water extraction pipe 13 is 0.2m higher than the top surface of the bottom sealing solidified soil layer, and a water level sensor is installed near the water inlet on the inner wall of the water collection well.

[0063] J. Pour an anti-seepage high molecular polymer aqueous solution into the water stop cavity 6 of the steel pipe pile female buckle 5 on the side wall of the drainage pool. The polymer aqueous solution is obtained by mixing high molecular sodium polyacrylate and water at a weight ratio of 1:1000.

[0064] K. Lay the cushion layer and track of the gantry crane track 8 on the double-row steel pipe pile structure.

[0065] 2) Load the shield muck that needs to be dehydrated into a row of drainage pools;

[0066] 3) When the slag is leveled or covers the entire bottom of the drainage pool, turn on the vacuum pump and continue to load the slag while draining the water under vacuum;

[0067] 4) When the drainage pool is more than half loaded with slag, a hollow iron ball connected to the anode of the electric osmosis controller is placed in the center of the slag pool, the cathode of the electric osmosis controller is connected to the steel pipe pile, the electric osmosis controller is turned on, and the slag is continuously loaded until it is full and the hollow iron ball is always above the slag surface;

[0068] 5) When the water level sensor gives a signal, that is, the water level in the drainage blind ditch 19 is about to be full, the vacuum pump is automatically turned off and the water pump is turned on to pump water from the water collection well 1; after the water pumping is completed, the water pump is automatically turned off and the vacuum pump is turned on again to pump air.

[0069] 6) When the surface soil moisture content in the soil pit is close to the plastic limit of the soil or the soil has sufficient bearing capacity, use a frog-type rammer or a tamping machine or a hammer to vibrate and load the soil;

[0070] 7) Keep the electro-osmosis controller in the on state until the slag enters a hard plastic state with only a small amount of bound water and no free water; control the slag discharge time by adjusting the output voltage of the electro-osmosis controller and the slag vibration loading power until it meets the design requirements.

[0071] 8) Turn off the vacuum pump, water pump and electro-osmosis controller and discharge the slag at the same time, and use a high-pressure water gun to rinse the inner surface of the slag drainage pool.

[0072] 9) Load the shield slag that needs to be dehydrated into another drainage pool, and repeat the above steps 3)-8) to keep the two drainage pools in a continuous slag loading and discharging state.

Claims

1. A recyclable soil drainage pool structure, characterized by: Includes drainage tank and electroosmosis controller; The drainage pool adopts a steel pipe pile continuous wall as the side wall of the drainage pool, and a plurality of vertically arranged plastic drainage boards are fixed on the inner side wall of the drainage pool. The bottom plate of the drainage pool includes a flexible resin sand water filter layer, a galvanized wire mesh layer, a drainage board layer and a solidified soil layer from top to bottom; a drainage blind ditch interconnected with the drainage board is provided on the upper part of the solidified soil layer; the plastic drainage board is connected to the drainage blind ditch; Several steel pipe piles on the side wall of the drainage pool are hollowed out to serve as water collection wells. Water holes are provided on the side wall of the water collection well, and the water holes connect the water collection well with the drainage blind ditch. The anode of the electro-osmosis controller is connected to a hollow iron ball suspended on the surface of the slag in the central area of ​​the drainage pool, while the cathode is connected to the continuous wall of the steel pipe pile and the galvanized wire mesh layer; the electro-osmosis controller forms a pulsed electromagnetic field in the drainage system and the slag in the pool cavity; A gantry crane track is provided on each side of the drainage pool, and the gantry crane track is arranged along the long side of the drainage pool; the side wall of the long side of the drainage pool adopts a double-row steel pipe pile structure, and the number of steel pipe piles in the rear row is less than that in the front row; The length of the steel pipe piles in the steel pipe pile continuous wall is 6.0~10.0m, and the diameter of the steel pipe piles is 0.6~1.0m; two adjacent steel pipe piles are connected by a mother buckle and a sub-buckle; the mother buckle is installed on one of the two adjacent steel pipe piles, and the sub-buckle is installed on the other of the two adjacent steel pipe piles through a sub-buckle connecting plate; the mother buckle is provided with a circular groove and a circular water-stop cavity, the water-stop cavity is located outside the groove, and the sub-buckle is a circular tubular structure, and the sub-buckle is inserted into a groove of the mother buckle.

2. The recyclable soil drainage pool structure according to claim 1 is characterized by: The flexible resin sand filter layer is cast or paved, and its thickness is 0.5-2.0cm; the galvanized wire mesh layer is electrically connected to the steel pipe piles on the side wall of the drainage pool; the upper end of the plastic drainage board is 3-5cm lower than the top surface of the drainage pool, and the lower end is fixed between the flexible resin sand filter layer and the galvanized wire mesh layer; a permeable pipe is provided in the drainage blind ditch.

3. The recyclable soil drainage pool structure according to claim 1 is characterized by: It comprises two rectangular drainage pools which share one side wall. The steel pipe piles at the four corners of the drainage pools are hollowed out to serve as water collecting wells, the depth of which is greater than the depth of the drainage pools. A sealing cover is provided on the top of the water collecting well, and there are also air suction pipes and water pumping pipes in the water collecting well. The upper ends of the air suction pipes and water pumping pipes pass through the sealing cover and are connected to a vacuum pump and a water pump.

4. The recyclable soil drainage pool structure according to claim 3 is characterized by: The bottom of the water collection well is sealed with cement mortar or solidified soil, and the depth of the water collection well is 1.5-2 times the depth of the drainage pool.

5. A method for draining slag using the recyclable slag drainage pool structure according to any one of claims 1 to 4, comprising the following steps: 1) Construct a recyclable soil drainage pool structure, install a vacuum pump and a water pump at the water collection well, and install a water level sensor in the water collection well to automatically extract air and water from the closed water collection well through pipelines: 2) Load the shield muck that needs to be dehydrated into a drainage pool in the muck drainage pool structure; 3) When the slag is leveled or covers the entire bottom of the drainage pool, turn on the vacuum pump and continue to load the slag while draining the water under vacuum; 4) When the drainage pool is more than half loaded with slag, place a hollow iron ball connected to the anode of the electric osmosis controller in the center of the slag pool, connect the cathode of the electric osmosis controller to the steel pipe pile, turn on the electric osmosis controller, and continue to load the slag until it is full and keep the hollow iron ball above the slag surface; 5) When the water level sensor gives a signal, that is, the water level in the drainage blind ditch is about to be full, the vacuum pump is automatically turned off and the pump is turned on to pump water from the water collection well; after the pumping is completed, the pump is automatically turned off and the vacuum pump is turned on again to pump air; 6) When the surface soil moisture content in the soil pit is close to the plastic limit of the soil or the soil has sufficient bearing capacity, use a frog-type rammer, a tamping machine or a hammer to vibrate and load the soil; 7) Keep the electric osmosis controller turned on until the slag enters the hard plastic state; 8) Turn off the vacuum pump, water pump and electro-osmosis controller and discharge the slag at the same time, and use a high-pressure water gun to rinse the inner surface of the slag drainage pool.

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