A complete set of equipment for preparing liquefied consolidated soil from waste slag soil and its construction method

Abstract

The present invention discloses a complete set of equipment for preparing liquefied consolidated soil from waste slag soil and a construction method thereof, comprising a screening device, a batching and conveying device, a material storage device, a material conveying device, a stirring device, a finished material temporary storage bin, a pumping device, a finished material conveying pump and a control device, wherein the discharge end of the screening device is connected to the feed end of the batching and conveying device, the discharge ends of the batching and conveying device and the pumping device are both connected to the feed end of the stirring device, the discharge end of the stirring device is connected to the feed port of the finished material temporary storage bin, the discharge port of the material storage device is connected to the feed port of the material conveying device, the discharge port of the material conveying device is connected to the batching and conveying device, the finished material conveying pump is connected to the discharge port of the finished material temporary storage bin through a pipeline, and the screening device and the batching and conveying device are radially offset; in general, the present invention has the advantages of convenient use, accurate and stable metering, low operation difficulty, fast construction period and good construction quality.

Description

Technical Field

[0001] The invention relates to the technical field of consolidated soil preparation, and in particular to a complete set of equipment for preparing liquefied consolidated soil from waste slag soil and a construction method thereof. Background Art

[0002] In recent years, in the backfill construction of various engineering foundation pits, fertilizer troughs, pipe culverts, and tailings cavities, we often encounter problems such as narrow foundation pit backfill space, heterogeneous backfill cross-section, large backfill depth, high quality requirements, and unsuitable backfilling equipment. In the current urban construction, road base backfill projects, and building foundation reinforcement projects, there are more and more deep foundation pit support projects. Due to the loose backfill soil, the building's scattered water, pipelines, access roads and other parts have sunk and damaged, and accidents of loss of use function have occurred from time to time. At the same time, the foundation pit backfill is limited by backfill conditions, space and other factors and cannot be backfilled densely. This situation poses a hazard to the seismic performance of high-rise buildings. Traditional backfilling processes mostly use plain soil or gray soil in layers using small compaction equipment for construction, which is difficult to construct and has a long backfilling period. The quality of backfill is still difficult to control, so most projects have to use plain concrete for backfilling to ensure the quality of backfill. The use of plain concrete backfilling is expensive and has high strength, which brings difficulties to secondary excavation for later maintenance. Liquefied consolidation soil is mainly soil, with cementitious materials and water added and stirred to form a highly liquefied pumpable reinforcement material. At present, domestic liquefied consolidation soil is produced using complete station equipment for producing concrete or mortar. However, the complete station equipment for preparing concrete or mortar from liquefied soil is not suitable for the current large, medium and small-volume, scattered backfill engineering conditions, and leads to multiple transportation of waste soil. Therefore, in order to solve the above problems, a complete set of equipment for preparing liquefied consolidation soil from waste soil and a construction method thereof are needed. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention provides a complete set of equipment and a construction method for preparing liquefied consolidated soil from waste slag soil, which is easy to use, has accurate and stable measurement, low operating difficulty, fast construction period and good construction quality.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a complete set of equipment for preparing liquefied consolidated soil from waste soil, comprising a screening device, a batching and conveying device, a material storage device, a material conveying device, a stirring device, a finished material temporary storage bin, a pumping device, a finished material conveying pump and a control device, the discharge end of the screening device is connected to the feed end of the batching and conveying device, the discharge ends of the batching and conveying device and the pumping device are both connected to the feed end of the stirring device, the discharge end of the stirring device is connected to the feed port of the finished material temporary storage bin, the discharge port of the material storage device is connected to the feed port of the material conveying device, the discharge port of the material conveying device is connected to the batching and conveying device, the finished material conveying pump is connected to the discharge port of the finished material temporary storage bin through a pipeline, and the screening device is radially offset relative to the batching and conveying device; the screening device, the material conveying device, the batching and conveying device, the stirring device, the finished material conveying pump and the pumping device are all electrically connected to the control device.

[0005] The screening device includes a screening frame and a drum screen. A feed hopper is provided at the upper end of the screening frame. A feeding device is connected to the discharge port of the feed hopper. The discharge end of the feeding device is connected to the feed port of the drum screen. The discharge port of the feed hopper is offset to achieve a radial offset setting of the screening device relative to the batching and conveying device.

[0006] The drum screen includes a screen body fixing frame, at least one arc-shaped screen, a rotating shaft, a bearing, a transmission mechanism, and a driving device. The arc-shaped screen is detachably connected to the screen body fixing frame, and the screen body fixing frame is fixedly connected to the rotating shaft. Both ends of the rotating shaft are supported on the screening frame through the bearings, and one end is connected to the driving device fixedly connected to the screening frame through the transmission mechanism. The driving device is electrically connected to a control device, and the feeding device adopts a belt conveyor.

[0007] The batching conveying device is a metering belt conveyor, which includes a foldable frame, a metering roller group and a belt. The metering roller group is movably connected to the foldable frame and is close to the lower surface of the upper part of the belt. The discharge port of the material conveying device is located on one side of the weighing area where the metering roller group is located. The foldable frame is divided into two sections, which are connected by a hinge.

[0008] The metering roller group includes a floating roller and a first weighing sensor, two ends of the floating roller are respectively provided with connecting plates, one end of the connecting plate away from the floating roller is fixedly connected to the rotating shaft, and the two ends of the rotating shaft are respectively rotatably connected to the foldable frame; the floating roller is closely attached to the lower surface of the upper part of the belt, the first weighing sensor is fixedly connected to the foldable frame, the floating roller is pressed against the surface of the first weighing sensor, and the first weighing sensor is electrically connected to the control device.

[0009] The metering belt conveyor also includes an upper roller, and the upper roller and the floating roller have the same structure; the floating roller includes a roller frame, a side roller support plate, a middle roller support plate, a side roller and a middle roller, the side roller support plate and the middle roller support plate are respectively fixedly connected to the two sides of the roller frame, the side rollers are detachably connected to the side roller support plates, the middle rollers are detachably connected to the middle roller support plates, and the side rollers and the middle rollers are offset.

[0010] A roller shaft is connected to the foldable frame near the metering roller group through a bearing, a speed measuring roller is fixedly connected to the roller shaft, an encoder is provided after one end of the roller shaft extends out of the bearing, the encoder is fixedly connected to the foldable frame, and the speed measuring roller is in close contact with the inner surface of the belt.

[0011] The material storage device includes a base frame, a second weighing sensor is fixedly connected to the base frame, a material storage part is fixedly connected to the upper end of the second weighing sensor, the material storage part includes a first material storage part and a second material storage part, the second material storage part is detachably connected to the upper end of the first material storage part, the disassembled second material storage part can be rotated 180 degrees and can be sleeved in the first material storage part, the discharge port of the first material storage part is connected to the material conveying device, the material conveying device adopts a screw conveyor, and the second weighing sensor is electrically connected to the control device.

[0012] The pumping device includes a mounting frame, a water storage bin, a water pump, an electromagnetic flowmeter for water metering, an admixture storage bin, an electromagnetic flowmeter for admixture metering and an admixture pump. The water storage bin and the admixture storage bin are both fixedly connected to the mounting frame. The water storage bin, the water pump and the electromagnetic flowmeter for water metering are connected via a pipeline. The admixture storage bin, the admixture pump and the electromagnetic flowmeter for admixture metering are connected via a pipeline. The water pump, the electromagnetic flowmeter for water metering, the admixture pump and the electromagnetic flowmeter for admixture metering are all electrically connected to a control device.

[0013] The stirring device is a twin-horizontal shaft vibrating mixer, and the stirring blades of the twin-horizontal shaft vibrating mixer are spiral-ribbon type or spaced blades arranged in a spiral-ribbon shape; the upper part of the twin-horizontal shaft vibrating mixer is provided with an upper cover, a first mudguard, and a second mudguard, and the batching and conveying device extends into the feed port of the upper cover, the first mudguard is located at the lower part of the portion of the batching and conveying device extending into the feed port of the upper cover and is fixed on the twin-horizontal shaft vibrating mixer, and the front part of the portion of the batching and conveying device extending into the feed port of the upper cover is provided with the second mudguard.

[0014] A construction method of a complete set of equipment for preparing liquefied consolidated soil from waste slag soil comprises the following steps:

[0015] 1. Take samples of the excavated and abandoned soil at the construction site according to the sampling standards to test the soil performance parameters, and design the aggregate mix ratio based on the measured data and construction requirements;

[0016] 2. Start the equipment and set the aggregate mix ratio, aggregate feeding sequence, feeding time, mixing time and other parameters on the control device;

[0017] 3. Start the equipment. The excavator or forklift adds the waste soil into the screening device. The waste soil is screened by the screening device to remove the oversized soil and light materials in the soil. After screening, the waste soil with qualified particle size is transported to the mixing device through the batching and conveying device. When the waste soil transported by the batching and conveying device reaches the set value of the control device, the batching and conveying device and the screening device stop at the same time; while the waste soil is being transported, the material conveying device starts to transport the material in the material storage device to the waste soil on the batching and conveying device. When the material transported by the material conveying device reaches the preset value of the control device, the material conveying device stops; pumping The device transports water and liquid additives to the mixing device through pipelines. When the water and liquid additives reach the preset values, the pumping device stops; after all aggregates are added to the mixing device, the mixing device starts mixing. After the mixing time set by the control device is reached, the warning light sounds, the mixing device unloading door opens, and the warning light stops sounding, and the finished liquefied consolidated soil enters the finished material temporary storage bin; then the above process is repeated, and the equipment performs batching and mixing production again. At the same time, the finished material conveying pump transports the finished material to the working surface through the pipeline for backfill pouring or pumps it to the concrete tanker for transportation to the work site for working surface pouring.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention can be used directly on the construction site, and the automatic control of the entire preparation process can be realized through the control device, the operation is highly intelligent and easy to operate; when in use, the finished material can be directly prepared and the prepared finished material can be quickly used, and the construction period is fast; the use of metering each material and using a double-horizontal-shaft vibrating mixer not only has a forced stirring effect on the mixed material, but also has a vibration effect, so that each material is in a flutter state, the movement speed of each material is accelerated, the number of effective collisions is increased, the diffusion speed of the hydration products on the surface of each material to the liquid phase is accelerated, the interface bonding strength is enhanced, and it has a significant effect on the improvement of the microstructure and the enhancement of the strength, so that the finished material is mixed more evenly, the quality is better, and the construction quality is improved;

[0020] 2. The screening device and the batching conveying device of the present invention are radially offset to ensure that the screened materials fall at the center of the batching conveying device, avoiding the accumulation of materials on one side; the batching conveying device adopts a metering belt conveyor, which can effectively prevent the belt from running off and reduce the equipment failure rate;

[0021] 3. The arc-shaped screen of the drum screen of the present invention is detachably connected to the screen body fixing frame, which is convenient for replacing the arc-shaped screen and cleaning the residue, and is very convenient to use;

[0022] 4. The metering roller group of the present invention comprises a floating roller and a weighing sensor. The floating roller is fixedly connected to the rotating shaft through a connecting plate. Both ends of the rotating shaft are rotatably connected to the foldable frame. The floating roller contacts the top of the weighing sensor, which can avoid the situation that one end of the floating roller deflects during weighing, causing uneven force on the floating roller and the weighing sensor, thereby ensuring the accuracy and stability of measurement.

[0023] 5. The side rollers and the middle rollers of the floating rollers of the present invention are offset and not collinear, which can effectively reduce the overall height of the floating rollers and make the overall structure more compact;

[0024] 6. The roller shaft of the present invention is fixedly connected with a speed measuring roller, and an encoder is sleeved on the roller shaft, which is used together with the metering roller group. When the control device detects the encoder signal and the weighing signal of the metering roller group at the same time, the metering roller group starts to measure, which can further ensure the accuracy and stability of measurement;

[0025] 7. The material storage device of the present invention comprises a first material storage part and a second material storage part, and the first material storage part and the second material storage part are detachably connected. After detachment, the second material storage part can be rotated 180 degrees and then inserted into the first material storage part, which is very convenient to use and greatly saves transportation space and transportation costs;

[0026] 8. The discharge port of the material conveying device of the present invention is connected to the batching conveying device to achieve premixing of powder and soil, thereby improving the mixing efficiency and quality; the discharge port of the material conveying device is located on one side of the belt section where the metering roller group is located, thereby reducing the influence of the material output by the material conveying device on the metering when the material is discharged, thereby making the metering more stable and accurate;

[0027] 9. The construction method of the present invention overcomes the drawback of the current traditional method of layered backfilling that is not dense, refines the raw materials, and improves the performance of the aggregate; pre-mixes the materials to improve production efficiency; adopts vibration stirring and uses directional vibration energy to realize that the soil particles in the liquefied state form a continuous interlocking structure with the multi-scale microparticles of the curing agent to ensure full homogenization, and cooperates with the functional components of the curing agent to effectively reduce the water consumption, so that the materials are mixed more evenly; at the same time, the construction method of the present invention is convenient for on-site preparation and on-site construction, with a short construction period and good construction quality;

[0028] 10. The liquefied consolidated soil prepared by the present invention has the characteristics of self-compacting and vibration-free, does not require compaction technology, and has adjustable strength. It is particularly suitable for filling narrow spaces such as pipeline corridor foundation trenches, deep foundation pits of buildings, municipal pipelines, and backrests of transportation engineering projects. The present invention not only makes full use of waste soil and engineering mud, but also has better uniformity of consolidated soil, reduced water consumption, significantly improved strength and volume stability, and has multiple advantages such as low permeability and corrosion resistance at the same material cost. It can also prepare lightweight, self-hydrophobic consolidated soil materials according to engineering needs. In general, the present invention has the advantages of easy use, accurate and stable measurement, low operation difficulty, fast construction period, and good construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 and Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 3 It is a schematic structural diagram of the screening device of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the feed hopper offset arrangement of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the drum screen of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the batching conveying device of the present invention;

[0034] Figure 7 It is a schematic diagram of the weighing area of ​​the present invention;

[0035] Figure 8 It is a structural schematic diagram of the metering roller group of the present invention;

[0036] Fig. 9 It is a structural schematic diagram of the floating roller of the present invention;

[0037] Fig.10 It is a structural schematic diagram of the speed measuring roller and the encoder of the present invention;

[0038] Fig.11 It is a structural schematic diagram of the material storage device and the material conveying device of the present invention;

[0039] Fig.12 This is a schematic diagram of the structure of the second material storage part after being inverted;

[0040] Fig.13 It is a schematic diagram of the installation of the first fender and the second fender of the present invention;

[0041] Fig.14 It is a construction method flow chart of the construction method of the present invention;

[0042] In the figure: 1. Screening device; 11. Screening frame; 12. Drum screen; 121. Screen body fixing frame; 122. Curved screen; 123. Rotating shaft; 124. Bearing; 125. Transmission mechanism; 126. Driving device; 127. Drum screen; 13. Feed hopper; 14. Feeding device; 2. Batching conveying device; 21. Foldable frame; 22. Belt; 23. Measuring roller group; 231. Floating roller; 2311. Roller frame; 2312. Side roller support plate; 2313. Middle roller support plate; 2314. Side roller ; 2315, middle roller; 232, weighing sensor; 233, connecting plate; 234 rotating shaft; 24 upper roller; 25 roller shaft; 26 speed measuring roller; 27 encoder; 3, material storage device; 31, base frame; 32, material weighing sensor; 33, material storage section; 331, first material storage section; 332, second material storage section; 4, material conveying device; 5, stirring device; 51, upper cover; 52, first mudguard; 53, second mudguard; 6, finished material temporary storage bin; 7, pumping device; 8, finished material conveying pump; 9, control device. DETAILED DESCRIPTION

[0043] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0044] Embodiment 1:

[0045] like Figure 1 or Figure 2As shown, in order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a complete set of equipment for preparing liquefied consolidated soil from waste slag soil, comprising a screening device 1, a batching and conveying device 2, a material storage device 3, a material conveying device 4, a stirring device 5, a finished material temporary storage bin 6, a pumping device 7, a finished material conveying pump 8 and a control device 9, the screening device 1 is a rotary screening device, the discharge end of the screening device 1 is connected to the feed end of the batching and conveying device 2, the discharge ends of the batching and conveying device 2 and the pumping device 7 are both connected to the feed end of the stirring device 5, the discharge end of the stirring device 5 is connected to the feed port of the finished material temporary storage bin 6, the discharge port of the material storage device 3 is connected to the feed port of the material conveying device 4, the discharge port of the material conveying device 4 is connected to the batching and conveying device 2, and the finished material conveying pump 8 is connected to the discharge port of the finished material temporary storage bin 6 through a pipeline; the screening device 1 and the batching and conveying device 2 are radially offset , the radial offset setting can be achieved by offsetting the screening device 1 and the batching and conveying device 2 by a certain distance during installation, so as to ensure that the screened material falls at the center of the batching and conveying device 2, avoid the material piling up on one side, and reduce the equipment failure rate; the screening device 1, the batching and conveying device 2, the material conveying device 4, the stirring device 5, the pumping device 7 and the finished material conveying pump 8 are all electrically connected to the control device 9; for the construction working surface within the pumping range of the finished material conveying pump 8 centered on the equipment and the construction conditions where the pumping pipeline is laid without obstacles, the finished material conveying pump 8 is used to directly pump the liquefied consolidated soil to the construction working surface through the pipeline, or the liquefied consolidated soil is pumped to the construction working surface by "pipeline + chute"; for other working conditions, "finished material conveying pump 8 + concrete tanker" or "finished material conveying pump 8 + concrete tanker + chute" can be used to cast the working surface.

[0046] like Figure 3 , Figure 4 As shown, the screening device 1 includes a screening frame 11 and a drum screen 12. A feed hopper 13 is provided at the upper end of the screening frame 11. The discharge port of the feed hopper 13 is connected to a feeding device 14, and the discharge end of the feeding device 14 is connected to the feed port of the drum screen 12. The discharge port of the feed hopper 13 is offset relative to the center line of the feed hopper along the direction of the feeding device 14, so as to realize the radial offset setting of the screening device 1 and the batching and conveying device 2. At this time, the material coming out of the discharge port of the feed hopper 13 will be offset by a certain distance relative to the feeding device 14 and the drum screen 12. When the drum screen 12 rotates to discharge the material, the discharge rotation direction of the drum screen 12 can ensure that the screened material falls at the center of the batching and conveying device 2 according to actual needs. The batching and conveying device 2 is a metering belt conveyor, and at this time, the belt 22 can be effectively prevented from running off, thereby reducing the equipment failure rate.

[0047] like Figure 5As shown, the drum screen 12 includes a screen body fixing frame 121, at least one arc-shaped screen 122, a rotating shaft 123, a bearing 124, a transmission mechanism 125, and a driving device 126. The arc-shaped screen 122 is detachably connected to the screen body fixing frame 121, and the screen body fixing frame 121 is fixedly connected to the rotating shaft 123. Both ends of the rotating shaft 123 are supported on the screening frame 11 through bearings 124, and one end is connected to the driving device 126 fixedly connected to the screening frame 11 through the transmission mechanism 125. The driving device 126 is driven by a motor, and the driving device 126 is electrically connected to the control device 9. The feeding device 14 is a belt conveyor, and the transmission mechanism 125 is a chain drive. The arc-shaped screen 122 can be removed from the screen body fixing frame 121, which is convenient for maintenance and replacement, and it is also convenient to clean up the debris remaining in the arc-shaped screen 122.

[0048] like Figure 6 , Figure 7 As shown, the batching conveying device 2 is a metering belt conveyor, which includes a foldable frame 21, a belt 22 and a metering roller group 23. The metering roller group 23 is movably connected to the foldable frame 21 and is close to the lower surface of the upper part of the belt 22. The upper part of the belt of the metering belt conveyor is supported by an upper roller 24, which is divided into a plurality of belt sections by two adjacent upper rollers 24. The discharge port of the material conveying device 4 is located on one side of the belt section where the metering roller group 23 is located. The belt section between the two upper rollers 24 where the metering roller group 23 is located is a weighing area, that is, the discharge port of the material conveying device 4 cannot be located in the weighing area where the metering roller group 23 is located, so as to reduce the influence of the material output by the material conveying device 4 on the metering when unloading. The foldable frame 21 is divided into two sections, which are connected by a hinge to realize the foldable function and facilitate the transportation of the metering belt conveyor.

[0049] like Figure 8 As shown, the metering roller group 23 includes a floating roller 231 and a first weighing sensor 232. Connecting plates 233 are respectively provided at both ends of the floating roller 231. One end of the connecting plate 233 away from the floating roller 231 is fixedly connected to a rotating shaft 234. Both ends of the rotating shaft 234 are respectively rotatably connected to the foldable frame 21. The floating roller 231 is closely attached to the lower surface of the upper part of the belt 22. The first weighing sensor 232 is fixedly connected to the foldable frame 21. The floating roller 231 is pressed on the upper surface of the first weighing sensor 232. The first weighing sensor 232 is electrically connected to the control device.

[0050] like Fig. 9As shown, the metering belt conveyor also includes an upper roller 24, which has the same structure as the floating roller 231; the floating roller 231 is a trough-type roller group, including a roller frame 2311, a side roller support plate 2312, a middle roller support plate 2313, a side roller 2314 and a middle roller 2315, the side roller support plate 2312 and the middle roller support plate 2313 are respectively fixed to the two sides of the roller frame 2311, the side roller 2314 is detachably connected to the side roller support plate 2312, and the middle roller 2315 is detachably connected to the middle roller support plate 2313; the side roller 2314 and the middle roller 2315 are offset and not colinear, which can effectively reduce the overall height of the floating roller 231 and make the structure more compact.

[0051] like Fig.10 As shown, a roller shaft 25 is connected to the foldable frame 21 near the metering roller group 23 through a bearing, a speed measuring roller 26 is fixedly connected to the roller shaft 25, one end of the roller shaft 25 extends out of the bearing and is sleeved with an encoder 27, the encoder 27 is fixedly connected to the foldable frame 21, the speed measuring roller 26 is close to the inner surface of the belt 22, the encoder 27 is used in conjunction with the metering roller group 23, and when the control device 9 simultaneously detects the signal of the encoder 27 and the weighing signal of the first weighing sensor 232 in the metering roller group 23, the metering roller group 23 performs metering, that is, the metering belt conveyor performs metering only when it is working, so as to avoid the first weighing sensor 232 being disturbed and performing metering when the metering belt conveyor is not working, thereby further ensuring the accuracy and stability of the measurement.

[0052] like Fig.11 , Fig.12 As shown, the material storage device 3 includes a base frame 31, a second weighing sensor 32 is fixedly connected to the base frame 31, a storage part 33 is fixedly connected to the upper end of the second weighing sensor 32, the storage part 33 includes a first storage part 331 and a second storage part 332, the second storage part 332 is detachably connected to the upper end of the first storage part 331, the second storage part 332 and the first storage part 331 are connected by bolts, the disassembled second storage part 332 can be rotated 180 degrees and can be sleeved in the first storage part 331, the discharge port of the first storage part 331 is connected to the material conveying device 4, the material conveying device 4 adopts a screw conveyor, the second weighing sensor 32 is electrically connected to the control device, and the material of the material storage device 3 is measured; after disassembly, the second storage part 332 can be rotated 180 degrees and then inserted into the first storage part 331, which greatly saves transportation space and transportation cost, and the second storage part 332 can be used as a storage space during transportation, which is very convenient.

[0053] The pumping device 7 includes a mounting frame, a water storage bin, a water pump, an electromagnetic flowmeter for water metering, an admixture storage bin, an electromagnetic flowmeter for admixture metering and an admixture pump. The water storage bin and the admixture storage bin are both fixedly connected to the mounting frame. The water storage bin, the water pump and the electromagnetic flowmeter for water metering are connected by a pipeline. The admixture storage bin, the admixture pump and the electromagnetic flowmeter for admixture metering are connected by a pipeline. The water pump, the electromagnetic flowmeter for water metering, the admixture pump and the electromagnetic flowmeter for admixture metering are all electrically connected to the control device. The electromagnetic flowmeter for water metering meters the added water, and the electromagnetic flowmeter for admixture metering meters the added admixture. When adding admixture and water, the water pump and the admixture pump can be used to pump the water and the admixture into the stirring device 5 respectively, or the water pump and the admixture pump can be used to pump the water and the admixture into the same pipeline for premixing and then entering the stirring device 5.

[0054] like Fig.13 As shown, the stirring device 5 is a twin-shaft vibrating mixer, and the stirring blades of the twin-shaft vibrating mixer are spiral-ribbon type or spaced blades arranged in a spiral-ribbon shape, which are more suitable for stirring liquefied consolidated soil and have higher stirring efficiency; the twin-shaft vibrating mixer not only has a forced stirring effect on the mixture, but also has a vibration effect, so that each material is in a flutter state, the movement speed of each material is accelerated, the number of effective collisions is increased, the diffusion speed of the hydration products on the surface of each material to the liquid phase is accelerated, and the aggregate surface is purified, and the interface bonding strength is enhanced. It has a significant effect on improving the microstructure and enhancing the strength, and can make the stirred materials more uniform and consolidated. The effect is better, thereby making the quality of the finished material better; the upper part of the twin-horizontal shaft vibrating mixer is provided with an upper cover 51, a first mudguard 52, and a second mudguard 53, the batching and conveying device 2 extends into the feed port of the upper cover 51, and the front part of the batching and conveying device 2 extending into the feed port of the upper cover 51 is provided with a first mudguard 52, and the second mudguard 53 is located at the lower part of the batching and conveying device 2 extending into the feed port of the upper cover 51 and is fixed on the twin-horizontal shaft vibrating mixer. The first mudguard 52 and the second mudguard 53 can effectively prevent the stirring device 5 from splashing the stirring material onto the batching and conveying device 2 when the stirring device 5 is working, thereby reducing the impact on the batching and conveying device 2.

[0055] like Fig.14 As shown, a construction method of a complete set of equipment for preparing liquefied consolidated soil from waste slag soil comprises the following steps:

[0056] 1. Take samples of the excavated and abandoned soil at the construction site according to the sampling standards to test the soil performance parameters, and design the aggregate mix ratio based on the measured data and construction requirements;

[0057] 2. Start the equipment and set the aggregate mix ratio, aggregate feeding sequence, feeding time, mixing time and other parameters on the control device;

[0058] 3. All driving power sources of the whole set of equipment are started in sequence according to the set sequence. The excavator or forklift adds the waste soil into the feed hopper 13 of the screening device 1. The waste soil reaches the feeding device 14 through the discharge port of the feed hopper 13. The feeding device 14 transports the waste soil into the drum screen 12 for screening to remove the oversized soil and light materials in the soil. After screening, the waste soil with qualified particle size is measured by the metering roller group 23 on the metering belt conveyor and then transported to the double-horizontal shaft vibrating mixer. At the same time, the material conveying device 4 is started to transport the powder curing agent in the material storage device 3 to the waste soil on the circular conveyor belt of the metering belt conveyor. As the circular conveyor belt moves, the powder curing agent is evenly spread and pre-mixed on the waste soil. The pumping device 7 measures the water and liquid additives through their respective electromagnetic flowmeters and transports them to the double-horizontal shaft vibrating mixer. When the weighing sensor 232 on the metering roller group 23 accumulates and measures to the set value of the control device 9, The metering belt conveyor and the feeding device 14 stop at the same time, and after the material weighing sensor 32 on the material storage device 3 reduces and meters to the preset value of the control device 9, the material conveying device 4 stops, and when the electromagnetic flow meters in the water and liquid additive devices reach the preset value, the pumping device 7 stops; after each aggregate is added to the twin-shaft vibrating mixer, the twin-shaft vibrating mixer is stirred, and after the stirring time set by the control device 9 is reached, the warning light sounds, the unloading door of the twin-shaft vibrating mixer opens, and the warning light stops sounding at the same time, and the finished liquefied consolidated soil enters the finished material temporary storage bin 6; then the above process is repeated, and the equipment performs batching and mixing production again, and at the same time, the finished material conveying pump 8 conveys the finished material to the working surface through the pipeline for backfill pouring or pumps it to the concrete tank truck for transportation to the work site for working surface pouring, and the effective pumping time of the finished material conveying pump 8 is less than the sum of the batching and mixing production time of the liquefied consolidated soil raw materials in the equipment.

[0059] The expansion of the liquefied consolidation soil poured on the working surface is controlled at 160-350mm. When pouring backfill on a narrow working surface, pour symmetrically in layers according to the lateral pressure of the building. When the consolidation strength of the liquefied consolidation soil reaches the secondary pouring standard, pouring can be continued again. When the backfill working surface is relatively wide, the layered pouring thickness is ≥200mm. Regardless of the type of working surface, after pouring the last layer, when there is no water on the surface of the liquefied consolidation soil, use plastic film to cover and maintain it to prevent cracks. Other subsequent construction can only be carried out after the strength is formed.

[0060] In a backfill project, the excavated soil of the tunnel is placed on one side of the tunnel foundation pit. The tunnel backfill depth is about 16m, the width of the left and right working surfaces is about 1.7-1.9m, the 7d unconfined compressive strength is ≥0.6MPa, the 28d unconfined compressive strength is ≥0.8MPa, the layered pouring depth is 1m, and there is a partition of 50-100m. The expansion of the liquefied consolidated soil transported to the construction surface for pouring is maintained at 280±20mm. First, the excavated soil is sampled and tested. According to the test results and the requirements of the engineering construction, the original soil quality is used as the benchmark to design the mix ratio of the original soil, curing agent A, curing agent B, water, and liquid curing agent; the equipment and construction method of the present invention are used for preparation. 12h after pouring, the standard for pouring again is that people stand on the consolidated liquefied consolidated soil without leaving footprints. The quality is sampled once every 1000m³, and one set of data is shown in the following table:

[0061]

[0062] It can be seen from the data in the table that they all meet the engineering design requirements.

[0063] The above description is only a preferred embodiment of the present invention, but is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil, characterized in that: It comprises a screening device, a batching and conveying device, a material storage device, a material conveying device, a stirring device, a finished material temporary storage bin, a pumping device, a finished material conveying pump and a control device, wherein the discharge end of the screening device is connected to the feed end of the batching and conveying device, the discharge ends of the batching and conveying device and the pumping device are both connected to the stirring device, the discharge end of the stirring device is connected to the feed port of the finished material temporary storage bin, the discharge port of the material storage device is connected to the feed port of the material conveying device, the discharge port of the material conveying device is connected to the batching and conveying device, the finished material conveying pump is connected to the discharge port of the finished material temporary storage bin through a pipeline, and the screening device and the batching and conveying device are radially offset; the screening device, the material conveying device, the batching and conveying device, the stirring device, the finished material conveying pump and the pumping device are all electrically connected to the control device; The batching conveying device is a metering belt conveyor, which includes a foldable frame, a metering roller group and a belt. The metering roller group is movably connected to the foldable frame and is in close contact with the lower surface of the upper part of the belt. The discharge port of the material conveying device is located on one side of the belt section where the metering roller group is located. The foldable frame is divided into two sections, which are connected by a hinge. The metering roller group includes a floating roller and a weighing sensor, both ends of the floating roller are fixed with a connecting plate, one end of the connecting plate away from the floating roller is fixedly connected to a rotating shaft, and both ends of the rotating shaft are respectively rotatably connected to the foldable frame; the floating roller is closely attached to the lower surface of the upper part of the belt, the weighing sensor is fixedly connected to the foldable frame, the floating roller is pressed on the upper surface of the weighing sensor, and the weighing sensor is electrically connected to a control device; The metering belt conveyor also includes an upper roller, and the upper roller and the floating roller have the same structure; the floating roller includes a roller frame, a side roller support plate, a middle roller support plate, a side roller and a middle roller, the side roller support plate and the middle roller support plate are respectively fixedly connected to both sides of the roller frame, the side roller is detachably connected to the side roller support plate, the middle roller is detachably connected to the middle roller support plate, and the side roller and the middle roller are offset; The steps include:

1. Take samples of the excavated and abandoned soil at the construction site according to the sampling standards to test the soil performance parameters, and design the aggregate mix ratio based on the measured data and construction requirements; 2. Start the equipment and set the aggregate proportion, aggregate feeding sequence, feeding time and mixing time parameters on the control device; 3. Start the equipment. The excavator or forklift adds the waste soil into the screening device. The waste soil is screened by the screening device to remove the oversized soil and light materials in the soil. The waste soil with qualified particle size after screening is transported to the mixing device through the batching and conveying device. When the waste soil transported by the batching and conveying device reaches the set value of the control device, the batching and conveying device and the screening device stop at the same time. While the waste soil is being transported, the material conveying device starts to transport the material in the material storage device to the waste soil on the batching and conveying device. When the material transported by the material conveying device reaches the preset value of the control device, the material conveying device stops. The pumping device The device transports water and liquid additives to the mixing device through pipelines. When the water and liquid additives reach the preset values, the pumping device stops; after all aggregates are added to the mixing device, the mixing device starts mixing. After the mixing time set by the control device is reached, the warning light sounds, the mixing device unloading door opens, and the warning light stops sounding at the same time, and the finished product vibrated liquefied consolidated soil enters the finished product temporary storage bin; then the above process is repeated, and the equipment performs batching and mixing production again. At the same time, the finished material conveying pump transports the finished material to the working surface through the pipeline for backfill pouring or pumps it to the concrete tanker for transportation to the work site for working surface pouring.

2. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 1 is characterized by: The screening device includes a screening frame and a drum screen. A feed hopper is provided at the upper end of the screening frame. A feeding device is connected to the discharge port of the feed hopper. The discharge end of the feeding device is connected to the feed port of the drum screen. The discharge port of the feed hopper is offset relative to the feed hopper to achieve a radial offset between the screening device and the batching and conveying device.

3. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 2, characterized in that: The drum screen includes a screen body fixing frame, at least one arc-shaped screen, a rotating shaft, a bearing, a transmission mechanism, and a driving device. The arc-shaped screen is detachably connected to the screen body fixing frame, and the screen body fixing frame is fixedly connected to the rotating shaft. Both ends of the rotating shaft are supported on the screening frame through the bearings, and one end is connected to the driving device fixedly connected to the screening frame through the transmission mechanism. The driving device is electrically connected to a control device, and the feeding device adopts a belt conveyor.

4. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 1 is characterized by: A roller shaft is connected to the foldable frame near the metering roller group through a bearing, a speed measuring roller is fixedly connected to the roller shaft, an encoder is provided after one end of the roller shaft extends out of the bearing, the encoder is fixedly connected to the foldable frame, and the speed measuring roller is in close contact with the inner surface of the belt.

5. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 1, characterized in that: The material storage device includes a base frame, to which a material weighing sensor is fixedly connected, a material storage part is fixedly connected to the upper end of the material weighing sensor, the material storage part includes a first material storage part and a second material storage part, the second material storage part is detachably connected to the upper end of the first material storage part, the disassembled second material storage part can be mounted in the first material storage part after being rotated 180 degrees, the discharge port of the first material storage part is connected to the material conveying device, the material conveying device adopts a screw conveyor, and the material weighing sensor is electrically connected to the control device.

6. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 1, characterized in that: The pumping device includes a mounting frame, a water storage bin, a water pump, an electromagnetic flowmeter for water metering, an admixture storage bin, an electromagnetic flowmeter for admixture metering and an admixture pump. The water storage bin and the admixture storage bin are both fixedly connected to the mounting frame. The water storage bin, the water pump and the electromagnetic flowmeter for water metering are connected via a pipeline. The admixture storage bin, the admixture pump and the electromagnetic flowmeter for admixture metering are connected via a pipeline. The water pump, the electromagnetic flowmeter for water metering, the admixture pump and the electromagnetic flowmeter for admixture metering are all electrically connected to a control device.

7. The construction method of a complete set of equipment for preparing liquefied consolidated soil from waste soil according to claim 1, characterized in that: The stirring device is a twin-horizontal shaft vibrating mixer, and the stirring blades of the twin-horizontal shaft vibrating mixer are spiral-ribbon type or spaced blades arranged in a spiral-ribbon shape; the upper part of the twin-horizontal shaft vibrating mixer is provided with an upper cover, a first mudguard, and a second mudguard, and the batching and conveying device extends into the feed port of the upper cover, the first mudguard is located at the lower part of the portion of the batching and conveying device extending into the feed port of the upper cover and is fixed on the twin-horizontal shaft vibrating mixer, and the front part of the portion of the batching and conveying device extending into the feed port of the upper cover is provided with the second mudguard.

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