Rapid treatment device and method for over-wet impurity-containing roadbed filler

Abstract

The invention relates to a rapid treatment device and method for over-wet impurity-containing roadbed filler, the rapid treatment device comprises a linear vibrating screen device, a hot air generator, an electric turner and a feeding mechanism, the linear vibrating screen device comprises a closed screen box and a vibrating mechanism for driving the screen box to vibrate, and a second screen is arranged in the screen box; the second screen divides the interior of the screen box into a material screening area on the upper side and a blowing and drying channel on the lower side, a stirring and drying area is arranged at the discharging end of the blowing and drying channel, and the filler discharging opening is formed in the bottom of the stirring and drying area. A feeding port of the linear vibrating screen device is connected with a discharging port of the feeding mechanism through a feeding conveying belt, a plurality of sets of electric turning and stirring machines are arranged in the turning and stirring drying area of the screen box, a plurality of air inlets are further formed in the portion, on the side wall of the blowing and drying channel, of the screen box, and the air inlets communicate with an air outlet of a hot air generator through pipelines. According to the invention, turning and drying, impurity removal and improvement are integrated, rapid treatment of the impurity-containing over-wet soil can be realized, the utilization rate and the construction efficiency of the impurity-containing over-wet soil can be greatly improved, the construction period is shortened, and the manufacturing cost is saved.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed engineering, and in particular to a device and method for quickly processing an over-wet impurity-containing roadbed filler. Background Art

[0002] When building highway embankments in rainy areas and riverside wetland areas, the filling materials along the embankments are often in an over-wet state (water content is greater than the compaction control water content of 6% or more), especially clay soil or soil with a large fine particle content (soil with a particle size of ≤0.075mm and a mass greater than or equal to 50% of the total mass), which makes it difficult to compact the roadbed during construction. Appropriate technical measures must be taken to treat it before it can be compacted to the specified compaction degree. The soil in the riverside wetland area has a high natural moisture content due to the influence of surface water, and there are often widespread vegetation with developed root systems such as reeds and water candles in the area, resulting in impurities such as tree roots, humus, and turf mixed in the soil. In order to ensure that the embankment does not form a sliding surface or produce a large subsidence in the future, it must also be treated before construction. The roadbed directly filled with these over-wet poor soils is prone to humidification and expansion during the operation period, which reduces the dry density of the roadbed soil, the bearing capacity and stiffness of the roadbed, and then induces early damage to the road surface.

[0003] Chemical improvement or soil replacement and backfilling are commonly used at home and abroad to treat over-wet soil fillers. Chemical improvement is to add lime or cement to over-wet soil to quickly reduce the moisture content of over-wet soil to meet the requirements of roadbed compaction. However, in actual engineering, this technology has high requirements for mechanical equipment and construction technology, its engineering cost is high, and the carbon emissions generated are large, which is not economical and environmentally friendly. The soil replacement and backfilling technology is to replace the over-wet soil in the roadbed range with soil whose moisture content basically meets the compaction requirements from other places. This technology will produce a large amount of borrowed soil and waste, causing soil and water loss along the line and occupying a large amount of arable land. At the same time, the replacement and backfilling method is labor-intensive and time-consuming, and the engineering cost is greatly increased. This method has high construction costs and inconvenient operation, and it is easy to cause great waste of land resources and serious soil and water loss.

[0004] At present, for highway subgrade construction in areas with poor soil distribution with high natural moisture content and poor water stability, the subgrade filler is usually turned or aired on non-rainy days to reduce the moisture content of the filler to near the compaction control moisture content. This process generally takes 2 to 3 days. This method is time-consuming and easy to delay the construction period. In addition, when construction is carried out in rainy seasons, the frequency of rainfall is high, the amount of precipitation is large, and the rainfall time is long. The drying time of the subgrade filler cannot be guaranteed, which seriously affects the progress of the project. Therefore, how to control the moisture content of over-wet poor fillers in riverside wetland areas is the main technical problem currently faced.

[0005] At the same time, for the treatment of embankment fillers containing tree roots, grass roots and other plant roots in the soil, manual removal is often used in engineering projects. This method is costly and time-consuming. If mechanical equipment is used for treatment, the entanglement of plant roots can easily cause damage to the loosening machine, which is inefficient and requires a lot of maintenance costs. Therefore, in order to use high-quality embankment fillers for construction while ensuring the improvement of construction efficiency and economic and environmental protection, it is another technical problem faced by over-wet poor fillers in riverside wetland areas.

[0006] Chinese invention patent CN111945501B discloses an intelligent stone avoidance device for turning and drying over-wet poor fillers of embankments and its use method, which stirs the fillers through a hollow spiral drill bit while blowing out hot air through the small holes of the drill bit to dry the fillers, and sprays quicklime along the hot air flow to absorb water efficiently for deep fillers, but the device can only turn and dry the fillers and avoid stones, and cannot achieve uniform turning and drying and impurity removal. Invention patent CN205934631U discloses a rapid dehumidification device for over-wet soil roadbed, which uses a turning wheel to stir the fillers, uses a wind temperature and wind speed control mechanism to dry the fillers, and uses a drum paving device to spread a tarpaulin on the turned and dried fillers, but cannot remove impurities and improve the fillers. Invention patent CN218880498U discloses an over-wet soil roadbed compaction device, which uses a rear roller to roll the road surface, and uses a blower mechanism to heat and dry the fillers before, after and during rolling, but cannot remove impurities, turn and dry, and improve the fillers. Invention patent CN106120507B discloses a rapid construction method for an over-wet soil roadbed, which uses the equipment described in invention patent CN205934631U and adopts different spreading, dehumidification and compaction processes for fillers with different permeability coefficients and air intake values ​​of soil-water characteristic curves. However, it also does not involve impurity removal and filler improvement. Summary of the invention

[0007] In order to solve the above problems, the present invention provides a device and method for quickly processing over-wet and impure roadbed fillers, which integrate soil screening, soil turning, drying and automatic root removal. It has a reasonable structure, convenient operation and low cost. It can screen and turn over the over-wet soil containing plant roots and other impurities, and can quickly reduce the moisture content of the over-wet soil to achieve the compaction control moisture content. At the same time, it can also improve the embankment filler so that the treated filler meets the construction requirements of different layers of the embankment.

[0008] To achieve the above object, the present invention adopts the following technical solution: The present invention discloses a rapid processing device for over-wet and impure roadbed filler, comprising a linear vibrating screen device, a hot air generator, an electric turning mixer and a feeding mechanism, wherein the linear vibrating screen device comprises a closed screen box and a vibrating mechanism for driving the screen box to vibrate, a second screen is arranged in the screen box, the second screen divides the screen box into an upper material screening area and a lower blowing and drying channel, a turning and drying area is arranged at the discharge end of the blowing and drying channel, a feeding port and a mixing port are arranged on one side of the screen box, a miscellaneous material discharge port and a filler discharge port are arranged on the other side, and the filler discharge port is arranged at the bottom of the turning and drying area; the feeding port of the linear vibrating screen device is connected with the discharging port of the feeding mechanism through a feeding conveyor belt, a plurality of groups of electric turning mixers are arranged in the turning and drying area of ​​the screen box, a plurality of air inlets are also arranged on the side wall of the blowing and drying channel of the screen box, and the air inlets are connected with the air outlet of the hot air generator through pipelines.

[0009] In this embodiment, a primary vibrating screen is provided in the feeding mechanism, a hopper is provided above the primary vibrating screen, the discharge port of the hopper is connected to the feed port of the primary vibrating screen, and the discharge port of the primary vibrating screen is connected to the feed port of the loading conveyor belt through a feeding channel.

[0010] In this embodiment, a first sieve is provided in the primary vibrating screen machine, the sieve hole diameter of the first sieve is 10-25 cm, and the sieve hole diameter of the second sieve is 2-10 cm.

[0011] In this embodiment, the output wind speed of the hot air generator is 15m / s~25m / s, and the output wind temperature is 60℃~75℃.

[0012] In this embodiment, a dust removal device is also installed on the screen box. The air inlet of the dust removal device is connected to the top of the screen box through a pipeline, and the air outlet of the dust removal device exchanges heat with the cold air at the air inlet of the hot air generator through a heat exchanger.

[0013] In this embodiment, the dust removal device is a filter bag dust removal device.

[0014] In this embodiment, a feeding device is installed on the material adding port of the screen box, one end of the feeding pipe is installed on the material adding port, and the other end is connected to the outlet of the material storage box.

[0015] In this embodiment, the screen box is provided with a plurality of sampling hatches on the side wall where the drying and blowing channel is located.

[0016] In this embodiment, a plurality of groups of electric stirrers are sequentially arranged in the blowing and drying channel of the screen box between the feed inlet and the discharge outlet.

[0017] The present invention also includes a method for quickly treating an over-wet impure roadbed filler, using the above-mentioned device for quickly treating an over-wet impure roadbed filler, specifically comprising the following steps: S1. Turn on the hot air generator to pass hot air into the screen box, and monitor the average wind speed of the screen box in real time through the wind speed and temperature measuring meter installed in the screen box. v and average temperature T , the wind speed and temperature measuring meter monitoring is connected to the hot air generator through the controller, and the wind speed and temperature are controlled by the controller; S2, start the feeding mechanism, feeding conveyor belt, linear vibrating screen device and electric mixer, pour the over-wet and impure poor filler excavated at the construction site into the feeding mechanism, and the feeding mechanism controls the discharge of the material; S3, the feeding conveyor conveys the filler to the linear vibrating screen device for vibrating, screening and drying, wherein the amplitude of the linear vibrating screen device is controlled to be 4-6 mm, the inclination angle of the screen surface is controlled to be 0-7°, the speed of the electric turning mixer is controlled to be 40-60 r / min, and the wind speed of the hot air generator entering the screen box is controlled to be 15m / s-25m / s and the temperature is controlled to be 60℃-75℃; S4. Control the moisture content of the filler by controlling the residence time of the filler in the screen box: Set the moisture content standard of the filler discharge to w , unit: %, the initial moisture content of the filler before entering the screen box is w i , unit: %, the packing stays in the screen box for t , unit: h, filler soil particle size is D , unit: cm; the thickness of the filler in the mixing and drying area of ​​the screen box is H , unit: cm; average ambient temperature in the screen box T , unit: °C; the average wind speed in the screen box is v , unit: m / s; thus the following formula (1) is obtained: (1) According to the actual required filler moisture content w and the average wind speed measured by the wind speed and temperature meter v and average temperature T , use formula (1) to calculate the residence time of the filler in the screen box t ; S5, time the filler passes through the screen box t After that, the hot air generator is turned off, and the improved material is transported to the inside of the screen box of the linear vibrating screen device through the feeding device, and the improved material and the filler are evenly mixed by an electric stirring machine, wherein the improved material is cement or slag powder or fly ash; S6. The filler is discharged through the filler discharge port.

[0018] Through the above In summary, compared with the prior art, the present invention has the following beneficial effects: 1) The poor roadbed filler that has been initially filtered and initially crushed by the primary screening vibrator is subjected to secondary screening by a linear vibrating device, and smaller debris in the filler is filtered out for the secondary screening. The filler after the secondary screening falls into the screen box of the linear vibrating device, which greatly improves the utilization rate of the poor roadbed filler containing debris such as vegetation roots, avoids the occupation of a large amount of fertile farmland and soil erosion caused by the abandoned soil replacement method, and reduces the project cost at the same time.

[0019] 2) The hot air generators installed on the left and right sides of the screen box are used to heat and dry the filtered poor roadbed fillers. Combined with the electric mixer embedded in the screen box, the roadbed fillers can be turned and dried in one, so that the embankment fillers can be evenly and quickly dehumidified from the natural moisture content to the compacted controlled moisture content, effectively shortening the drying time of the roadbed fillers and ensuring the progress of the project.

[0020] 3) The present invention reduces humidity and removes impurities from the over-wet filler to meet the requirements for use as the lower road filler. At the same time, the present invention improves the filler economically and conveniently by providing a feeding device, thereby meeting the requirements for over-wet soil to be used as filler in the roadbed working area. The feeding device is also equipped with an airflow device, which is very convenient for adding the improved material to the filler for uniform mixing. The process is simple and the improvement effect is improved.

[0021] 4) Most of the existing technologies place the filler in the roadbed work area and then process the filler, which makes it difficult to effectively remove impurities, turn over and dry, and improve the filler. The present invention uses a complete set of equipment to process the over-wet and impure filler. It is a more industrialized processing equipment with better processing effect and higher efficiency.

[0022] In summary, the present invention integrates turning, drying, impurity removal and improvement into one, which can achieve rapid dehumidification of over-wet soil containing impurities such as plant roots. At the same time, the improved turning and mixing device is used to improve the filler for use as filler in the roadbed working area, which can greatly improve the utilization rate of over-wet soil containing impurities and the construction efficiency, shorten the construction period and save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 It is a top view of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the linear vibrating screen device of the present invention.

[0026] Figure 4 It is a structural schematic diagram of the hot air generator of the present invention.

[0027] Figure 5 It is a structural schematic diagram of the feeding mechanism of the present invention.

[0028] Figure 6It is a structural schematic diagram of the electric stirring machine of the present invention.

[0029] Figure 7 It is a schematic structural diagram of the conveying device of the present invention.

[0030] In the figure, 1. linear vibrating screen device; 2. hot air generator; 3. electric stirring machine; 4. debris discharge port; 5. filler discharge port; 6. vibration motor; 7. feeding conveyor belt; 8. primary vibrating screen machine; 9. hopper; 10. independent motor; 11. transmission mechanism; 12. feeding device; 13. sampling hatch; 14. dust removal device; 15. screen box; 16. second screen; 17. stirring and drying area; 18. feeding mechanism; 20. feeding pipe; 21. trumpet-shaped pipe; 22. dump truck; 23. slag discharge port; 24. feeding port; 25. crushing device; 26. axial flow fan; 27. wind speed and temperature measuring meter; 28. spiral air flow device; 29. ​​stirring blade. DETAILED DESCRIPTION

[0031] The following is a detailed description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-3 The present invention is a rapid processing device for over-wet and impure roadbed filler, comprising a linear vibrating screen device 1, a hot air generator 2, an electric stirring machine 3, a feeding conveyor belt 7 and, the linear vibrating screen device 1 comprises a closed screen box 15 and a vibrating mechanism for driving the screen box 15 to vibrate, the screen box 15 is provided with a second screen 16, the second screen 16 divides the screen box 15 into an upper material screening area and a lower blowing and drying channel, the discharge end of the blowing and drying channel is provided with a stirring and drying area 17, the screen box 15 is provided with a heat-insulating layer on the side walls of the blowing and drying channel and the stirring and drying area 17, one side of the screen box 15 is provided with a feed port 24 and a mixing port, and the other side is provided with a debris discharge port 4 and a filler discharge port 5, the feed port 24 is communicated with the material screening area, the debris discharge port 4 is communicated with the discharge end of the material screening area, the admixture port is communicated with the blowing and drying channel, the filler discharge port 5 is arranged at the bottom of the turning and drying area 17, and a valve is arranged on the filler discharge port 5, and the residence time of the filler in the screen box 15 is controlled by the valve; the feed port 24 of the linear vibrating screen device 1 is connected to the feeding mechanism 18 through the feeding conveyor belt 7, and multiple groups of electric turning machines 3 are arranged in the screen box 15, in the blowing and drying channel and the turning and drying area 17, and the screen box 15 is also provided with multiple air inlets on the side wall of the blowing and drying channel, and the air inlets are communicated with the air outlet of the hot air generator 2 through a pipeline; The distance between the second screen 16 and the top plate of the screen box 15 is greater than the distance between the second screen 16 and the bottom plate of the screen box 15, so that the height of the blowing and drying channel is greater than the height of the material screening area. The aperture of the second screen 16 is 2-10 cm, and 5 cm is further preferred. A crushing device 25 is also installed in the feed port 24 of the screen box 15, and the crushing device 25 can perform preliminary crushing on the filler entering the screen box 15. The vibration mechanism of the linear vibrating screen device 1 includes a transmission mechanism 11 and a vibration motor 6, and the vibration motor 6 is connected to the screen box 15 through the transmission mechanism. Accordingly, the over-wet and impure filler that has been preliminarily screened and preliminarily crushed is vibrated, blown, and heated in the screen box 15, and falls into the blowing and drying channel of the screen box 15 through the second screen 16, and finally enters the mixing and drying area 17 through vibration, and is mixed by the electric mixing machine 3. The filler with larger particle size and the relatively dry root system above the second screen 16 are vibrated to the debris discharge port 4 and discharged therefrom. When the filler needs to be improved, the improved material is added into the screen box 15 through the mixing port 1, and falls to the bottom plate of the screen box 15 through the second screen 16, and is fully and evenly flipped by the flap mechanism and the filler, and then discharged from the filler discharge port 5.

[0033] See also Figure 5 The feeding mechanism 18 is further provided with a primary vibrating screen machine 8 driven by an independent motor 10. The sieve hole of the primary vibrating screen machine 8 is 10-25 cm, preferably 15 cm. A hopper 9 is provided above the primary vibrating screen machine 8. The discharge port of the hopper 9 is connected with the feed port of the primary vibrating screen machine 8. The hopper 9 is a bell-shaped mouth with a feed port larger than the discharge port. The primary vibrating screen machine 8 is provided with a slag discharge port 23 above the first screen and a discharge port below the first screen. The discharge port of the primary vibrating screen machine 8 is connected with the feed port 24 of the loading conveyor belt 7 through a feeding channel.

[0034] By using the above structure, the present invention performs vibration screening and impurity removal on the over-wet and impure filler of the embankment according to the following method: The dump truck 22 pours the over-wet and impure filler into the hopper 9 of the feeding mechanism 18. The primary vibrating screen 8 is driven by the independent motor 10 to filter the over-wet and impure filler. The screened impurities are discharged and cleaned through the slag discharge port 23. The pre-screened filler is discharged through the feeding channel below the primary vibrating screen 8, and part of the water in the pre-screened filler is also discharged. The pre-screened filler discharged from the discharge port of the primary vibrating screen 8 is transported to the feed port 24 of the linear vibrating screen device 1 through the feeding conveyor belt 7. The second screen 16 of the linear vibrating screen device 1 is moved between the vibration motor 6 and the transmission mechanism. The filler entering from the feed port 24 is placed on the second screen 16 for secondary vibration screening. The aperture of the second screen 16 is smaller than that of the first screen, and the debris is further discharged through the debris discharge port 4. The processed filler falls into the blowing and drying channel and enters the turning and drying area 17 through the blowing and drying channel. The moisture content is controlled by the dual effects of the electric turning machine 3 in the turning and drying area 17 and the hot air of the hot air generator 2. After the moisture content reaches the standard, it is discharged through the filler discharge port 5, and a dump truck 22 is used to receive the processed filler below the filler discharge port 5.

[0035] See also Figure 6 The electric stirring machine 3 includes a plurality of stirring blades 29, which are driven by a power machine to make forward and reverse movements in a circular direction. A plurality of electric stirring machines 3 are evenly distributed in the screen box 15 of the linear vibrating screen device 1 to stir the filler that falls into the bottom of the screen box 15, that is, the blowing and drying channel and the stirring and drying area 17 after screening.

[0036] See also Figure 4 The air outlet of the hot air generator 2 is connected to the inside of the screen box 15, the output wind speed of the hot air generator 2 is 15m / s~25m / s, and the output wind temperature is 60℃~75℃.

[0037] The device described in the present invention dehumidifies and turns over the over-moist and impure poor fillers of the embankment according to the following process: the fillers after the second vibration screening pass through the second screen 16 and fall into the screen box 15 of the linear vibration screening device 1, and the hot air generator 2 sucks the room temperature air into the screen box 15, and heats the room temperature air by electric energy to form hot air, the hot air speed is 15m / s~25m / s, and the air temperature is 60℃~75℃, and the hot air is blown into the screen box 15 of the linear vibration screening device 1 from the air outlet to heat the initially screened fillers; at the same time, the electric stirring machine 3 under the screen stirs the initially screened fillers, and the stirring blades 29 rotate to stir the fillers at a speed of 40-60r / min. During the stirring process, the fillers are dried by the hot air to achieve dehumidification and turning over and drying of the fillers.

[0038] See also Figure 7The feeding device 12 includes a feeding pipe 20, two groups of trumpet-shaped pipes 21 and a storage box. The storage box is connected to the feeding pipe 20 through a group of trumpet-shaped pipes 21. The feeding pipe 20 is connected to the inside of the screen box 15 through another group of trumpet-shaped pipes 21. The improved material in the storage box passes through the trumpet-shaped pipes 21, the feeding pipe 20 and the trumpet-shaped pipes 21 in sequence and enters the inside of the screen box 15.

[0039] As a supplement to the feeding device 12, an airflow feeding device is also installed in the feeding pipe 20 of the feeding device 12. The airflow feeding device is a spiral airflow device 28. The spiral airflow device 28 is driven by a motor to blow the improved material entering the feeding pipe 20 to the inside of the screen box 15, so that the improved material is evenly sprayed in the filler; under the stirring action of the electric stirring machine 3, the improved material and the filler are evenly stirred, and the filler improvement is efficiently achieved.

[0040] The gas inlet of the filter bag dust removal device 14 is connected to the inside of the screen box 15. During the process of turning and drying the filler, the filter bag dust removal device 14 works synchronously to discharge the hot air, wet air and dust generated during the turning and drying process out of the linear vibrating screen device screen box 15. The filtered air collected by the filter bag dust removal device 14 is discharged through the gas outlet, and the dust is discharged from the dust outlet. Of course, the gas discharged from the filter bag dust removal device 14 can also be passed into the heat exchanger, and the heat exchanger then performs heat exchange with the pipeline of the air inlet of the hot air generator 2 to further improve the energy utilization rate.

[0041] The screen box 15 is also provided with a sampling hatch 13, which can take out the filler to determine the moisture content of the filler. There are at least two sampling hatches 13, which are arranged at different positions on the side wall of the screen box 15, so that the sampling is random.

[0042] In this embodiment, the motor power of the linear vibrating screen device 1 is 3×2kW, and the screening area is 6m 2 , the amplitude is 4-6mm, the screen surface inclination is 0-7°, the second screen 16 has three layers, and the screen hole size of the second screen 16 is 2-10cm; the feeding mechanism 18 is an electromagnetic vibrating feeder, the motor power of the electromagnetic vibrating feeder is 2×0.55kW, and the double amplitude is 3-5mm; there are two debris discharge ports 4, each of which is connected to a discharge belt conveyor, and the filler discharge port 5 is connected to a discharge belt conveyor.

[0043] The method for quickly treating the over-wet and impure filler in the embankment of this embodiment is specifically carried out in the following steps: 1) Turn on the hot air generator 2 to preheat the residual air inside the screen box 15; 2) The feeding mechanism 18 is turned on, and the dump truck 22 pours the over-wet and impure fillers excavated from the construction site into the hopper 9 of the feeding mechanism 18. After the feeding is completed, the dump truck 22 drives to the filler discharge port 5 to wait for discharge. The primary vibrating screen 8 inside the feeding mechanism 18 drives the first screen to perform a preliminary screening of the over-wet and impure fillers to remove the longer plant roots in the fillers. After the preliminary screening, it falls through the feeding channel to the feeding conveyor belt 7, and the debris on the first screen is discharged through the debris discharge port 4; 3) The feeding conveyor belt 7 transports the initially screened filler to the screen box 15 through the feed port 24 for vibrating, screening and turning. The filler enters from the feed port 24 and falls onto the second screen 16 for secondary vibrating. The smaller debris screened out on the second screen 16 is discharged through the debris discharge port 4. The filler after the secondary vibration and screening passes through the second screen 16 with a pore size of 5 cm and falls into the preheated screen box 15. The hot air generator 2 blows hot air with a wind speed of 15m / s~25m / s and a wind temperature of 60℃~75℃ into the screen box 15 of the linear vibrating screen device 1, and then the electric stirring machine 3 at the bottom of the second screen 16 stirs the filler to achieve filling turning and baking; 4) During the process of turning and drying the filler, the filter bag dust removal device 14 works synchronously to discharge the hot air, wet air and dust generated during the turning and drying process out of the screen box 15. The filter bag dust removal device 14 ensures the discharge of clean air and filtered dust.

[0044] 5) Control the moisture content of the filler by controlling the residence time of the filler in the screen box: Set the moisture content standard of the filler discharge to w , unit: %, the initial moisture content of the filler before entering the screen box is w i , unit: %, the packing stays in the screen box for t , unit: h, filler soil particle size is D , unit: cm; the thickness of the filler in the mixing and drying area of ​​the screen box is H , unit: cm; average ambient temperature in the screen box T , unit: °C; the average wind speed in the screen box is v , unit: m / s; thus the following formula (1) is obtained: (1) According to the actual required filler moisture content w and the average wind speed measured by the wind speed and temperature meter v and average temperature T , use formula (1) to calculate the residence time of the filler in the screen box t ; Filler passing time in screen box t Afterwards, the hot air generator is turned off and sampling is carried out through the sampling cabin door 13.

[0045] 6) After the moisture content of the filler reaches the standard, the improved material is conveyed to the inside of the screen box 15 by the conveying device 12, and the improved material is sprayed on the filler after the secondary vibration screening under the impetus of the airflow by the conveying device. The electric stirring machine 3 stirs the improved material and the filler at the same time to achieve the mixing of the filler and the improved material. Finally, the filler that meets the standard is conveyed to the dump truck 22 through the filler discharge port, and the dump truck 22 transports the filler to the construction site.

[0046] Compared with the traditional roadbed construction method of natural sun drying and dehumidification, abandoned soil replacement and chemical dehumidification method, the advantages of the present invention are: 1) Greatly shortens the time it takes for over-wet soil to drop from its natural moisture content to the moisture content controlled by compaction.

[0047] The silt and silty sand formed by transportation and deposition in riverside wetlands have a high natural moisture content. If natural drying and dehumidification are used to achieve compaction and control of moisture content, it usually requires 1 to 3 consecutive non-rainy days. However, by using the device described in the present invention, by setting appropriate wind temperature and wind speed gears according to different over-wet soils, dehumidification can be completed within 5 minutes to 10 minutes, greatly improving construction efficiency.

[0048] 2) Greatly improves the utilization rate of over-wet soil containing plant roots and other debris.

[0049] When directly using over-wet soil to fill the roadbed, if the traditional natural drying construction method is used, it requires a long period of continuous non-rainy days. Over-wet soil is often difficult to compact and control the moisture content, and after compaction, it cannot meet the compaction requirements. Most projects have to use abandoned soil for replacement, resulting in a large amount of land occupation and soil and water loss due to abandoned soil, causing serious damage to the ecological environment. The device described in the present invention can achieve dehumidification and root removal of over-wet soil containing plant roots (over-wet impurities and poor fillers), and even in the rainy season, over-wet soil can be directly used to fill the roadbed.

[0050] 3) The heating drying method in the existing filler drying technology is inefficient and the drying is uneven. The device of the present invention not only dries the filler evenly, but also improves the filler conveniently and economically by using solid waste materials such as fly ash.

[0051] 4) It has good economic benefits. Compared with the traditional roadbed construction measures, the device of the present invention is less dependent on climate and environmental conditions and has significant economic benefits.

[0052] 5) Can effectively ensure the quality of the project.

[0053] If the traditional natural drying and dehumidification method is adopted, it is difficult for the over-wet soil to reach the compaction control moisture content. Due to the construction period limit, it is often rolled at a state higher than the compaction control moisture content, and it is difficult to meet the compaction requirements. In addition, the over-wet soil containing impurities such as plant roots that have not been cleaned up is used as roadbed filler. The decay and decomposition of the plant roots cause the over-wet soil roadbed to easily settle and deform after construction, thereby causing deformation and cracking of the road surface, seriously threatening traffic safety and increasing maintenance costs. The present invention can achieve rapid dehumidification of over-wet soil, and can strictly control the compaction of over-wet soil at the compaction control moisture content, so that the roadbed meets the requirements of compaction quality and bearing ratio, thereby ensuring the deformation and strength stability of the roadbed after construction, effectively avoiding roadbed settlement diseases, ensuring the road performance and driving safety, and reducing maintenance costs.

[0054] In summary, the device for rapidly processing over-wet impure fillers of embankments can rapidly reduce the moisture content of over-wet soil fillers to the compaction control moisture content of over-wet soil and remove impurities such as plant roots in the soil, while conveying the improved materials to the screen box 15 through a conveying device to improve the fillers. The present invention aims to solve the technical problem that over-wet soil in my country's riverside wetland areas is difficult to reach the compaction control moisture content within a specified time through turning over and drying due to its high moisture content. The present invention integrates turning over, drying, and automatic root removal into one device with a reasonable structure, convenient operation, and low cost, and can quickly reduce the moisture content of over-wet soil. At the same time, the embankment fillers are improved, and the utilization rate and construction efficiency of over-wet soil containing plant roots (over-wet impure fillers) are greatly improved, the construction period is shortened, the construction cost is saved, and the economic benefits are remarkable.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A device for quickly treating over-wet and impure roadbed filler, characterized by: It includes a linear vibrating screening device, a hot air generator, an electric turning mixer and a feeding mechanism. The linear vibrating screening device includes a closed screen box and a vibrating mechanism for driving the screen box to vibrate. A second screen is arranged in the screen box, and the second screen divides the screen box into an upper material screening area and a lower blowing and drying channel. A turning and drying area is arranged at the discharge end of the blowing and drying channel. A feeding port and a material addition port are arranged on one side of the screen box, and a sundries discharge port and a filler discharge port are arranged on the other side. The filler discharge port is arranged at the bottom of the turning and drying area. The feeding port of the linear vibrating screening device is connected with the discharge port of the feeding mechanism through a loading conveyor belt, and a plurality of electric turning mixers are arranged in the turning and drying area of ​​the screen box. The screen box is also provided with a plurality of air inlets on the side wall of the blowing and drying channel, and the air inlets are connected with the air outlet of the hot air generator through pipelines.

2. The device for rapidly treating over-wet impurity-containing roadbed filler according to claim 1 is characterized in that: A primary vibrating screen is provided in the feeding mechanism, a hopper is provided above the primary vibrating screen, a discharge port of the hopper is connected to a feed port of the primary vibrating screen, and the discharge port of the primary vibrating screen is connected to a feed port of a loading conveyor belt through a feeding channel.

3. The rapid treatment device for over-wet impurity-containing roadbed filler according to claim 2 is characterized by: The first screen is provided in the primary vibrating screen machine, the screen hole diameter of the first screen is 10-25 cm, and the screen hole diameter of the second screen is 2-10 cm.

4. The device for rapidly treating over-wet impure roadbed filler according to claim 1 is characterized in that: The output wind speed of the hot air generator is 15m / s to 25m / s, and the output wind temperature is 60°C to 75°C.

5. The rapid treatment device for over-wet impurity-containing roadbed filler according to claim 1 is characterized by: A dust removal device is also installed on the screen box. The air inlet of the dust removal device is connected to the top of the screen box through a pipeline, and the air outlet of the dust removal device exchanges heat with the cold air at the air inlet of the hot air generator through a heat exchanger.

6. The device for rapidly treating over-wet impurity-containing roadbed filler according to claim 5, characterized in that: The dust removal device is a filter bag dust removal device.

7. The rapid treatment device for over-wet impurity-containing roadbed filler according to claim 1 is characterized by: A feeding device is installed on the material adding port of the screen box, one end of the feeding pipe is installed on the material adding port, and the other end is communicated with the outlet of the material storage box.

8. The device for rapidly treating over-wet impure roadbed filler according to claim 1, characterized in that: The screen box is provided with a plurality of sampling hatches on the side wall where the blowing and drying channel is located.

9. The device for rapidly treating over-wet impure roadbed filler according to claim 1, characterized in that: In the blowing and drying channel of the screen box, a plurality of groups of electric stirrers are arranged in sequence between the feed inlet and the discharge outlet.

10. A method for rapidly treating over-wet impure roadbed filler, using the device for rapidly treating over-wet impure roadbed filler according to any one of claims 1 to 9, characterized in that: The specific steps include: S1. Turn on the hot air generator to pass hot air into the screen box, and monitor the average wind speed of the screen box in real time through the wind speed and temperature measuring meter installed in the screen box. v and average temperature T , the wind speed and temperature measuring meter monitoring is connected to the hot air generator through the controller, and the wind speed and temperature are controlled by the controller; S2, start the feeding mechanism, feeding conveyor belt, linear vibrating screen device and electric mixer, pour the over-wet and impure poor filler excavated at the construction site into the feeding mechanism, and the feeding mechanism controls the discharge of the material; S3, the feeding conveyor belt transports the filler to the linear vibrating screen device for vibrating, screening and drying, and controls the wind speed of the hot air generator entering the screen box to be 15m / s~25m / s and the temperature to be 60℃~75℃; S4. Control the moisture content of the filler by controlling the residence time of the filler in the screen box: Set the moisture content standard of the filler discharge to w , unit: %, the initial moisture content of the filler before entering the screen box is w i , unit: %, the packing stays in the screen box for t , unit: h, filler soil particle size is D , unit: cm; the thickness of the filler in the mixing and drying area of ​​the screen box is H , unit: cm; average ambient temperature in the screen box T , unit: °C; the average wind speed in the screen box is v , unit: m / s; thus the following formula (1) is obtained: （1） According to the actual required filler moisture content w and the average wind speed measured by the wind speed and temperature meter v and average temperature T , use formula (1) to calculate the residence time of the filler in the screen box t ; S5, time the filler passes through the screen box t After that, the hot air generator is turned off, and the improved material is transported to the inside of the screen box of the linear vibrating screen device through the feeding device, and the improved material and the filler are evenly mixed by an electric stirring machine, wherein the improved material is cement or slag powder or fly ash; S6. The filler is discharged through the filler discharge port.

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