Atmospheric dust removal device for subway tunnel construction

Abstract

The invention discloses an atmosphere dust removal device for subway tunnel construction, belongs to the technical field of tunnel safety devices, and particularly relates to a dust falling and removing related device during subway tunnel construction. The device comprises a base and a water curtain mechanism and further comprises a rotary lifting mechanism, the water curtain mechanism is rotatably arranged on the base in a lifting mode through the rotary lifting mechanism, a water curtain recycling mechanism, a sewage filtering mechanism and a sewage purifying mechanism are arranged on the base, and the water curtain recycling mechanism recycles a water curtain and is used for filtering of the sewage filtering mechanism and purifying of the sewage purifying mechanism. And the purified water enters the water curtain mechanism again. According to the device, a water curtain is formed by directly spraying water, the capturing efficiency of dust in the atmosphere is improved, meanwhile, a recycling device is arranged, part of sprayed water can be recycled for secondary utilization, water source waste is reduced, and the concentration of haze in the tunnel can be controlled and reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel safety devices, in particular to a dust removal device for subway tunnel construction. BACKGROUND

[0002] The prior art generally uses a shield machine to excavate a subway tunnel, and the accumulated soil at the rear during the tunneling process is excavated by the excavator into a transport vehicle and transported to an external space. A large amount of dust is generated during the above process, and since the tunnel is a closed space, the large amount of dust is difficult to effectively disperse in the atmosphere of the subway tunnel, which can cause serious safety hazards to the health of the subway construction personnel.

[0003] The existing dust removal device includes a spray head installed on the side wall or fence of the subway tunnel, which captures dust by water mist, but as the shield machine continuously advances, new spray heads need to be installed behind the shield machine, which is a large amount of work. Meanwhile, a fog machine is also used for dust removal, but both the fog machine and the spray head have a common problem that the water mist is directly sprayed into the tunnel space, which can increase the humidity of the air in the tunnel for a long time, form fog in a closed space, reduce the visibility in the tunnel, easily cause water damage to the construction equipment, and make the construction site slippery, causing safety accidents. Water cannot be recycled, which can cause serious waste of water resources, and the spray dust removal is not efficient. SUMMARY

[0004] The purpose of the present application is to provide an atmospheric dust removal device for subway tunnel construction, which forms a water curtain by directly spraying water to improve the capture efficiency of dust in the atmosphere, and is provided with a recycling device to recycle part of the sprayed water for secondary use, reduce water waste, and the water curtain with splash-proof measures will not form fog in the atmosphere like spray. The device can switch between water spraying and fog recycling, which can solve the problem of fog reducing the visibility in the tunnel and easily causing water damage to the construction equipment. At the same time, the device can adjust the height of the water curtain and the direction of the rotating water curtain according to the needs, and improve the dust removal effect. The specific scheme is as follows: An atmospheric dust removal device for subway tunnel construction, comprising a base and a water curtain mechanism, further comprising a rotating and lifting mechanism, the water curtain mechanism being rotatably and liftably arranged on the base by the rotating and lifting mechanism, the base being provided with a water curtain recycling mechanism, a sewage filtering mechanism and a sewage purification mechanism, the water curtain recycling mechanism recycling the water curtain, the sewage filtering mechanism filtering and the sewage purification mechanism purifying, the purified water re-entering the water curtain mechanism; The water curtain mechanism comprises a vertical section in the shape of a "U" The spray pipe is provided with a base at the bottom, a plurality of nozzles are arranged on the side wall of the spray pipe facing the base, the nozzles are in the shape of a venturi, the plurality of nozzles spray water to the water curtain recycling mechanism to form a water curtain, and the spray pipe is connected to the pumping device through the first water pipe. The water curtain recycling mechanism comprises a water hole arranged on the base, and the water curtain flows to the sewage filtering mechanism through the water hole.

[0005] Further, the rotating and lifting mechanism comprises a double-shaft motor, a rotating disc and a screw rod, a ring hole is arranged on the end wall of the base facing the spray pipe, the end wall part in the ring hole constitutes the rotating disc, an electromagnetic clutch assembly one and an electromagnetic clutch assembly two are arranged on the motor shaft one of the double-shaft motor, the electromagnetic clutch assembly one is provided with a driving gear one, the driving gear one is connected to a driven gear one on each side thereof through a transmission belt one, the driven gear one is provided with a screw rod one, the screw rod one passes through the rotating disc, the spray pipe is arranged on the screw rod one in a lifting manner, the electromagnetic clutch assembly two is arranged at the central axial hole of the rotating disc, an electromagnetic clutch assembly three is arranged on the motor shaft two of the double-shaft motor, and the electromagnetic clutch assembly three is arranged at the central axial hole of the circular filter screen.

[0006] Further, the motor shaft two is provided with an electromagnetic clutch assembly four after passing through the filter screen, the electromagnetic clutch assembly four is provided with a driving gear two, the driving gear two is connected to a driven gear two on each side thereof through a transmission belt two, the driven gear two is provided with a screw rod two, the screw rod two is arranged on the base after passing through the sewage purification mechanism, the screw rod two is provided with a screw block, and the screw block is arranged between the screw rod two and the purification layer.

[0007] Further, the haze extraction mechanism comprises an electromagnetic valve-controlled air pump, an air inlet pipe, an air passage one, an air passage two and an air outlet pipe, one end of the air inlet pipe is connected to one air inlet of the air pump, the other end of the air inlet pipe is communicated with the spray pipe, the other air inlet of the air pump is communicated with the air passage, the air passage one and the air passage two are arranged through the side wall of the base, the air passage one is located between the filter screen and the rotating disc, the air passage two is located at the side wall of the base, the air outlet of the air pump is connected to one end of the air outlet pipe, and the air outlet pipe is communicated with the water accumulation part of the base through the air passage two.

[0008] Further, the pumping device comprises an electrically-controlled double-path water outlet water pump, and the other water outlet of the water pump is connected to a second water pipe.

[0009] Further, the air outlet pipe is fixedly arranged on the sewage purification mechanism at the air outlet thereof after passing through the air passage two, and is located between the sewage filtering mechanism and the sewage purification mechanism.

[0010] Further, the rotating disc is provided with a splash-proof layer, a water delivery pipe is connected to the side wall corresponding to the water accumulation part of the base, a roller is arranged at the bottom of the device, a push handle is arranged on the side wall of the device, the base is a hollow cylinder, and an annular flange is formed on the edge of the upper end surface of the base, which is used to block the splashing water, The spray pipe is arranged along the radial direction of the rotating disc.

[0011] Further, the sewage purification mechanism comprises a laminated purification layer arranged in the base below the filter screen, the purification layer comprises a coarse filter interception layer for intercepting silt particles and fiber impurities not smaller than 20 microns, a magnetic flocculation layer for adsorbing iron-containing magnetic particles and strengthening colloidal coagulation, an ultra-fine filter layer for intercepting fine dust and colloids with a size of 1-20 microns, an antibacterial disinfection layer, an oil stain adsorption and odor removal and partial heavy metal adsorption purification layer, and a slow-release scale inhibition layer for preventing calcium and magnesium ion scale.

[0012] Further, a plurality of Venturi-shaped nozzles are arranged on the other side wall of the spray pipe, and an electromagnetic valve is arranged on each nozzle, the electromagnetic valve, the pumping device, the air pump, the electromagnetic clutch assembly and the double-shaft motor are connected to the PLC.

[0013] Further, the device further comprises a dust concentration sensor, a haze particle sensor, a spray pipe water accumulation sensor, and water level sensors one and two arranged at different heights of the water accumulation part and connected to the PLC, the dust concentration sensor detects the dust concentration of the tunnel atmosphere in real time, the haze particle sensor detects the haze particle concentration in real time, and the spray pipe water accumulation sensor detects whether the spray pipe is accumulated with water.

[0014] Compared with the prior art, the present application has at least one of the following technical effects: 1. The device of the present application forms a water curtain by directly spraying water, improves the dust capture efficiency in the atmosphere, and at the same time, the recycling device can recycle part of the sprayed water for secondary use, reduces the waste of water source, reduces the harm of wet and slippery caused by tunnel water accumulation, and the water curtain combined with the splash-proof measure will not cause the rapid formation of haze in the atmosphere like spraying, the device can switch between water spraying and haze recycling, and can solve the problem of reducing the visibility in the tunnel caused by haze, and the problem of water stain damage to construction equipment; 2. The device of the present application adjusts the height of the water curtain and the direction of the rotating water curtain according to the dust distribution and flow direction, controls the opening number and opening mode of the nozzles as needed, is flexible and improves the dust removal effect, and the water curtain dust removal is more efficient; 3. The spray cylinder and the base of the present application can be used to form negative pressure to extract haze, one device can realize the functions of water curtain spraying and haze extraction, and the number of devices in the tunnel is reduced; 4. Based on the data detection results, the present invention designs a backwashing purification layer structure, which can realize purification while backwashing. If the wastewater detection data exceeds a predetermined threshold, the purification effect can be improved by backwashing when the purification layer has not reached the point where it needs to be disassembled for maintenance. 5. The present invention designs a structure in which the second water pipe is controlled by PLC to pump the accumulated water into the space between the filter screen and the purification layer. It can repeat the purification in real time based on the data detection results of the water accumulation section, thereby improving the purification effect. 6. The smog extracted by this invention can be recycled into the water collection section for secondary use, and the gas is discharged after being purified by the purification layer, which can improve the air quality in the tunnel. 7. Through structural design, this invention can effectively recycle the extracted smog; 8. The filter screen of this invention can rotate, effectively preventing the mesh from clogging; 9. The purification layer of the present invention can filter mud and sand particles, fiber impurities, fine dust and colloids. It can also adsorb ferromagnetic particles and enhance colloidal coagulation, antibacterial disinfection, adsorb oil stains, remove odors, and release scale inhibitors to prevent metal ions from scaling on metal spray nozzles. It fully considers the multiple purification factors of subway dust, with comprehensive functions and synergistic effects to improve the purification effect. 10. Set a disc-shaped rotating disk, and set " " along the radial direction of the rotating disk. The water sprayed from the shaped nozzle has a larger recovery area, and the two rotate synchronously, working in conjunction with the annular flange to ensure that the rotating disk rotates to every angle. The water sprayed from the nozzle can be effectively recycled. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front sectional view of the atmospheric dust removal device for subway tunnel construction in this application, viewed radially along the rotating disk; Figure 2 This is a side view of the atmospheric dust removal device for subway tunnel construction in this application; Figure 3 This is a top view of the atmospheric dust removal device for subway tunnel construction in this application; Figure 4 This is a schematic diagram of the stacked structure of the purification layer in this application; Figure 5 This is a connection diagram of the automatic control system of this application. Attached Figure Description

[0017] 1-base; 2-nozzle; 3-first water pipe; 4-nozzle; 5-water hole; 6-annular flange; 7-filter screen; 8-double shaft motor; 9-rotary disc; 10-annular hole; 11-motor shaft one; 12-electromagnetic clutch assembly one; 13-electromagnetic clutch assembly two; 14-driving gear one; 15-transmission belt one; 16-driven gear one; 17-screw one; 18-motor shaft two; 19-electromagnetic clutch assembly three; 20-PLC; 21-electromagnetic clutch assembly four; 22-driving gear two; 23-transmission belt two; 24-driven gear two; 25-screw two; 26-purification layer; 27-screw block; 28-anti-splashing layer; 29-water delivery pipe; 30-pumping device; 31-second water pipe; 32-air pump; 33-air inlet pipe; 34-air passage one; 35-air passage two; 36-air outlet pipe; 37-dust concentration sensor; 38-fog particle sensor; 39-accumulated water sensor; 40-laser particle size sensor; 41-laser turbidimeter one; 42-differential pressure sensor group; 43-magnetic particle counter group; 44-electromagnetic pulse generator; 45-Zeta potential instrument; 46-TOC sensor; 47-fluorescent biological sensor; 48-conductivity sensor; 49-laser turbidimeter two; 50-residual chlorine sensor; 51-water level sensor one; 52-water level sensor two; 53-coarse filtration interception layer; 54-magnetic flocculation layer; 55-ultra-fine filtration layer; 56-antibacterial disinfection layer; 57-adsorption purification layer; 58-delayed release scale inhibition layer; 59-roller; 60-solenoid valve. DETAILED DESCRIPTION

[0018] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, technologies, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0019] It is to be understood that the terminology "includes", "has", "holds", "contains" and / or "comprising", when used in this specification and in the following claims, indicates the presence of the described features, integers, steps, operations, elements, and / or components but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] It is also to be understood that the terminology "and / or" when used in this specification and in the following claims, refers to at least one of the items, or any combination of one or more of the items, and includes all possible combinations of the items.

[0021] As used in the description of the application and the appended claims, the term "if' can be interpreted to mean "when" or "upon" or "in response to determining" or "in response to detecting" depending on the context. Similarly, the phrase "if it is determined" or "if [a described condition or event] is detected" can be interpreted to mean "upon determining" or "in response to determining" or "upon detecting [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0022] In addition, in the description of the application and the appended claims, the terms "first", "second", "third", etc. are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0023] Reference in the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", etc. in various places in the specification are not necessarily all referring to the same embodiment, unless otherwise specifically stated. The terms "comprising", "including", "having" and their variants mean "including but not limited to", unless otherwise specifically stated.

[0024] The application discloses a subway tunnel construction atmospheric dust removal device, referring to the attached Figures 1-5 , comprising a base 1 and a water curtain mechanism, further comprising a rotating lifting mechanism, the water curtain mechanism is rotatably arranged on the base 1 through the rotating lifting mechanism, the base 1 is provided with a water curtain recovery mechanism, a sewage filtering mechanism and a sewage purification mechanism, the water curtain recovery mechanism recovers the water curtain, is used for filtering of the sewage filtering mechanism and purification of the sewage purification mechanism, and the purified water reenters the water curtain mechanism. The water curtain mechanism forms a water curtain to achieve the effect of dust removal, the water curtain recovery mechanism recovers the water curtain, alleviates the problems that the water or the spray cannot be recovered in the prior art, causes the subway tunnel to be wet and slippery due to long-time water accumulation, the water is difficult to handle, haze is formed and water resources are wasted, and the purified water reenters the water curtain mechanism to form a water curtain again, and is reused. The water curtain mechanism is used for raising or lowering the water curtain through the rotating lifting mechanism, or rotates the water curtain vertically towards the moving direction of the dust to achieve a better dust removal effect. The device is provided with a roller 59 at the bottom, and a push handle is arranged on the side wall, so that the device can be manually pushed to a tunnel area with more dust, and a driving device can also be added.

[0025] Specifically, the water curtain mechanism comprises a "U"-shaped vertical cross section The system consists of a square-shaped nozzle 2, a pumping device 30, and a first water pipe 3. A base 1 is located at the bottom of the nozzle 2. Multiple nozzles 4, shaped like venturi tubes, are located on one side wall of the nozzle 2 facing the base 1. These nozzles spray water towards a water curtain recovery mechanism, forming a water curtain. The nozzle 2 is connected to the pumping device 30 via the first water pipe 3. The pumping device 30 is used to pump the water recovered from the base 1 back into the nozzle 2 for secondary use. The "shape" structural design causes the nozzle 2 to face one side wall of the base 1 (" The nozzles 4 (with a horizontal sidewall of a "-shaped" structure, parallel to the upper surface of the base 1) allow water to flow vertically downwards onto the base 1, forming a vertical water curtain. The spacing between adjacent nozzles 4 is reasonable, and the sprayed water overlaps to form the water curtain. (See attached diagram.) Figures 1-2 The cross-section is square, which facilitates the arrangement of multiple rows of nozzles 4 side by side on the side wall facing the base 1. Each row of nozzles 4 can be arranged relatively parallel or staggered, so that the vertical water curtain forms a gap that dust cannot penetrate. At the same time, nozzles 4 can also be opened on the side of the side wall facing away from the base 1, which can effectively capture the dust above the nozzle 2. Nozzles 4 are also provided on the two vertical sidewalls of the "shaped" nozzle 2, and can be provided on both the inner and outer sides. The two inner nozzles 4 spray water curtains that overlap perpendicularly with the horizontal sidewalls, improving the dust removal effect. The water curtains fall onto the water curtain recovery mechanism and can be effectively recovered. The water curtains sprayed by the outer nozzles 4 are used to remove dust. The dust in the tunnels on both sides of the "shaped" structure is removed. All nozzles 4 are venturi tubes to increase the water jet rate. All nozzles 4 are equipped with solenoid valves 60, which are connected to PLC 20. They can selectively open all or some nozzles 4 according to the dust distribution, for example, giving priority to opening recyclable nozzles 4.

[0026] See appendix Figure 1 and attached Figure 3 The water curtain recycling mechanism includes water holes 5 opened on the base 1. The base 1 is a hollow cylindrical shape. The water holes 5 are set through the upper wall of the base 1. The edge of the upper surface of the water hole 5 is raised to form an annular flange 6, which is used to block splashing water. Water flows into the sewage filtration mechanism inside the base 1 through the water holes 5. The sewage filtration mechanism includes a circular filter screen 7 set in the base 1, which plays the role of filtering large particles. The water passing through the filter screen 7 flows to the sewage purification mechanism below it.

[0027] The sewage purification mechanism comprises a laminated purification layer 26 arranged in the base 1 below the filter screen 7, and the purification layer 26 comprises a coarse filter interception layer 53 for intercepting silt particles and fiber impurities not less than 20 μm, a magnetic flocculation layer 54 for adsorbing iron-containing magnetic particles and strengthening colloidal coagulation, an ultra-fine filter layer 55 for intercepting fine dust and colloids of 1-20 μm, an antibacterial disinfection layer 56, an adsorption purification layer 57 for adsorbing oil stains, removing odors and part of heavy metals, and a slow-release scale inhibition layer 58 for releasing scale inhibitors and preventing calcium and magnesium ion scale. The above-mentioned functional layers are in the form of a disc, and can be integrally formed in a contact type from top to bottom, and are separated by a stainless steel support plate with flow guide holes, the plate thickness is 5 mm, the hole diameter is 10 mm, the edge is provided with a plastic sealing ring with a smooth surface, and the inner wall of the base 1 is sealed to prevent sewage bypassing and short circuiting. The sealing ring can slide up and down along the base 1, or the layers can be arranged in an interval from top to bottom, and if arranged in an interval, each layer can be reinforced by a porous stainless steel or the like.

[0028] The coarse filter interception layer 53 has a thickness of preferably 60 mm, comprises a honeycomb polyurethane foam, the pore size is preferably 20-50 μm, and the foam surface is compounded with an anti-adhesion easy-rebound polytetrafluoroethylene coating. The magnetic flocculation layer 54 comprises a permanent magnetic grid composed of neodymium-iron-boron magnets, has a thickness of 40 mm, and the neodymium-iron-boron magnets in the form of rods are arranged in parallel to form the grid, the distance between adjacent neodymium-iron-boron magnets in the same column and between adjacent neodymium-iron-boron magnets in adjacent columns is 5 mm, and the neodymium-iron-boron magnets are filled with magnetic ceramsite with a particle size of 3-5 mm. This layer mainly adsorbs ferromagnetic impurities (such as shield machine wear iron powder) that may be contained in, for example, construction dust, and grinding dust of underground metal impurities. The ultra-fine filtration layer 55 has a thickness of preferably 50 mm, comprises a gradient pore size glass fiber membrane, the pore size of the upper layer is preferably 10-20 μm, the pore size of the lower layer is preferably 1-10 μm, the membrane substrate is impregnated with nano-ZnO, has antibacterial properties, prevents biological slime from blocking, and traps 1-20 μm fine dust and colloids. The antibacterial disinfection layer 56 has a thickness of 50 mm, comprises three upper, middle and lower layers, wherein the upper layer comprises a porous ceramic plate loaded with silver ions, the pore size is 5 μm, and the silver ion content is 0.1%, the middle layer comprises an ultraviolet light catalytic net, which comprises a titanium net loaded with TiO2, and a low-pressure ultraviolet lamp is arranged on the titanium net, and the lower layer is a slow-release type chlorine tablet carrier, which comprises a polyvinyl chloride grid plate, and a chlorine-containing disinfection tablet is built in the polyvinyl chloride grid plate. The chlorine-containing disinfection tablet dissolves and releases effective chlorine components at a mass of 0.5 grams per hour in water. Silver ions destroy bacterial cell membranes, have long-acting bacteriostatic properties, ultraviolet light (wavelength 254 nm) + TiO2 photocatalysis, and oxidize and inactivate bacteria and viruses. The slow-release chlorine tablet releases low-concentration hypochlorous acid to strengthen disinfection, and adopts the triple synergistic antibacterial method of "metal ions + photocatalysis + chemical slow release" to solve the problems of "incomplete bacteriostasis and short duration" of a single method. The adsorption purification layer 57 has a thickness of 30 mm, comprises a mesoporous activated carbon and a bamboo fiber composite felt, and the two are arranged in layers. The bamboo fiber composite felt has a porosity of 85%, can adsorb oil stains, remove odors and part of heavy metals, has natural hydrophilicity, improves water flux, and the activated carbon loaded with nano-MnO2 can oxidize and decompose part of organic oil stains. The slow-release scale inhibition layer 58 has a thickness of 20 mm, comprises porous calcium carbonate ceramsite loaded with phosphonate, has a particle size of 2-3 mm, releases scale inhibitors, prevents calcium and magnesium ion scaling, and the ceramsite pores are wrapped with slow-release phosphonate to continuously inhibit the formation of scale in circulating water and protect the nozzle 4.

[0029] The sewage after capturing dust by the water curtain is first filtered by the upper filter screen 7, and then enters the filter layer to realize a hierarchical purification mechanism: the coarse filtration and interception layer 53 physically intercepts silt particles and construction fibers through the three-dimensional network structure of the honeycomb foam, and the polytetrafluoroethylene coating reduces the adhesion of particles, facilitating backwashing regeneration; the magnetic flocculation layer 54 utilizes the magnetic field generated by the permanent magnet to adsorb the ferromagnetic particles (such as iron powder generated by the shield machine wear) in the sewage by the magnetic ceramic, and at the same time, the magnetic field promotes the coagulation of colloidal particles (such as clay particles) into large particles, improving the subsequent filtration efficiency; the gradient glass fiber membrane of the ultra-fine filtration layer 55 is designed to avoid the rapid clogging of single-pore membranes through the design of "upper layer coarse interception and lower layer fine interception", and the nano ZnO component inhibits the breeding of bacteria (construction sewage is prone to breed microorganisms); the antibacterial and disinfecting layer 56 adopts a triple synergistic antibacterial principle, the first heavy metal ion long-acting antibacterial, the silver ion ceramic plate on the upper layer of the antibacterial and disinfecting layer 56 continuously releases Ag⁺ (concentration 0.05-0.1 mg / L) through ion exchange, Ag⁺ penetrates the bacterial cell membrane and combines with DNA to inhibit its replication, the 24h antibacterial rate of Escherichia coli and mold is ≥99%, and the silver ion has high stability and can be continuously released for more than 3 months, the second ultraviolet light catalytic inactivation, the middle layer ultraviolet lamp tube (power 10-15 W) emits 254 nm ultraviolet light to directly damage the nucleic acid structure of bacteria and viruses; at the same time, TiO2 generates hydroxyl radicals (·OH) under ultraviolet light excitation to oxidize and decompose the bacterial cell membrane, and the two work synergistically to inactivate viruses (such as influenza viruses) at a rate of ≥99.9%, and there is no secondary pollution, the third chemical slow-release strengthening, the lower layer chlorine-containing disinfecting sheet (effective chlorine content 50%) slowly dissolves to release hypochlorous acid (HClO) to deeply disinfect the residual microorganisms treated by the previous two processes, ensuring that the total number of bacteria in the effluent is ≤10 CFU / mL (meeting the standard for domestic miscellaneous water), and by controlling the dissolution rate (0.5 g / h), the corrosion of equipment or odor caused by excessive residual chlorine is avoided; the adsorption and purification layer 57 adsorbs oil stains (such as lubricating oil dripping from construction machinery) through mesoporous activated carbon, and bamboo fiber enhances hydrophilicity to solve the problem of "slow water absorption and easy to be cemented" of traditional activated carbon. The ceramic of the slow-release scale inhibition layer 58 releases phosphonate to inhibit the formation of calcium and magnesium ions in the circulating water to avoid clogging the water curtain nozzle 4 (traditional filtration does not consider scale inhibition, and long-term use is prone to scale formation). The sewage is filtered by the coarse filtration and interception layer 53 (to remove large particles) → the magnetic flocculation layer 54 (to coagulate fine particles) → the ultra-fine filtration layer 55 (to intercept particles below 1 μm + to preliminarily inhibit bacteria) → the antibacterial and disinfecting layer 56 (to synergistically inactivate microorganisms) → the adsorption and purification layer 57 (to remove oil stains + to adsorb disinfection by-products) → the slow-release scale inhibition layer 58 (to prevent scale formation), for example, to control the final effluent turbidity ≤5 NTU, the total number of bacteria ≤10 CFU / mL, etc., which can be safely reused for the water curtain mechanism.

[0030] The magnetic ceramsite comprises 25-30 parts of ferroferric oxide magnetic powder, 35-40 parts of clay, 15-20 parts of fly ash, 8-10 parts of perlite, 2-3 parts of zinc oxide and 3-5 parts of sodium silicate by weight. The 25-30 parts of ferroferric oxide magnetic powder endows the ceramsite with residual magnetism (weak magnetism to medium magnetism), so that it can be adsorbed or guided by the strong magnetic field of neodymium iron boron and at the same time the capture ability to magnetic particles in water is enhanced, that is, the magnetic ceramsite is provided with magnetism and responds to the external magnetic field. The 35-40 parts of clay provides the basic framework for the ceramsite and forms a hard shell after high-temperature sintering to ensure the structural strength. The 15-20 parts of fly ash is an industrial waste for recycling, which reduces the cost and at the same time forms a porous structure in the sintering process due to the combustion of carbon components, thereby enhancing the adsorption property. The 8-10 parts of perlite expands to produce pores at high temperature, so that the density of the ceramsite is reduced (beneficial to water flow penetration) and the porosity is increased to 30%-50%. The 2-3 parts of zinc oxide serves as an antibacterial agent to inhibit the reproduction of bacteria on the surface of the ceramsite and avoid secondary pollution, aiming at the bacteria that may breed in the subway sewage (such as microorganisms in sweat of construction personnel and soil). The 3-5 parts of sodium silicate serves as a binder to improve the stability of the raw material forming and avoid cracking during sintering.

[0031] The porous calcium carbonate ceramsite comprises, by weight fraction, 60-70 parts of light calcium carbonate, 15-20 parts of fly ash, 5-10 parts of bentonite, 3-5 parts of HEDP phosphonate, and 2-3 parts of sodium bicarbonate. The light calcium carbonate provides a main skeleton as a scale inhibitor carrier; it can adjust the calcium hardness in water by dissolving itself, inhibit scale crystallization, and has a high specific surface area, which facilitates adsorption and loading of scale inhibitors. The light calcium carbonate with a particle size of 1-5 μm can slowly dissolve in water to release Ca²⁺, which inhibits the combination of excess Ca²⁺ and Mg²⁺ in water with carbonate to form scale (CaCO3, MgCO3) through the "common ion effect", thereby reducing the generation of scale from the source. The fly ash introduces a glass phase and a porous structure, reduces the density of the ceramsite, and improves the porosity (promotes slow release of scale inhibitors). The industrial waste (containing SiO2, Al2O3, etc.) has low cost and has the activity of volcanic ash, and reacts with calcium carbonate to form a glass phase during sintering, thereby enhancing the strength of the ceramsite. The micropores on the surface of the particles are retained after sintering, and together with the pores produced by the foaming agent, they form a through porous structure to provide a channel for the slow release of scale inhibitors. The bentonite contains clay minerals such as montmorillonite, which can improve the plasticity of the raw materials after swelling in water, form a stable porous structure during sintering, and facilitate granulation and molding (ensure that the particle size of the ceramsite is uniform and controlled at 2-3 mm). The HEDP phosphonate is used as a slow-release scale inhibitor and is loaded in the pores of the ceramsite, slowly released to inhibit the scaling of calcium and magnesium ions in water, and is loaded in the pores of the ceramsite through physical adsorption or chemical combination. The porous structure of the ceramsite can control the dissolution rate of the scale inhibitor (such as 0.05-0.1 g / m² per hour), continuously interfere with the growth of scale crystals, and avoid nozzle 4 and pipe scaling and blockage. Sodium bicarbonate is used as a foaming agent. Sodium bicarbonate (NaHCO3) decomposes into CO2 during sintering at 600-800°C, forming uniformly distributed pores in the ceramsite, so that the porosity reaches 40%-60%. The pore size is controlled by the amount of foaming agent, for example, 2%-3% when the pore size is 50-200 μm, which improves the slow release efficiency, ensures that the scale inhibitor can slowly seep out, and avoids rapid loss.

[0032] See the attached Figure 1The rotating lifting mechanism comprises a double-shaft motor 8, a rotating disc 9 and a screw rod. A ring hole 10 is formed on an end wall of the base 1 facing the spray pipe 2. The end wall part in the ring hole 10 constitutes the rotating disc 9. The ring hole 10 is used for avoiding blocking the rotation of the rotating disc 9. The motor shaft one 11 of the double-shaft motor 8 is provided with an electromagnetic clutch assembly one 12 and an electromagnetic clutch assembly two 13. The electromagnetic clutch assembly one 12 is provided with a driving gear one 14. The driving gear one 14 is connected with a driven gear one 16 on each side thereof through a transmission belt one 15. The driven gear one 16 is provided with a screw rod one 17. The screw rod one 17 penetrates through the rotating disc 9. The electromagnetic clutch assembly two 13 is arranged at the middle shaft hole of the rotating disc 9. The motor shaft two 18 of the double-shaft motor 8 is further provided with an electromagnetic clutch assembly three 19. The electromagnetic clutch assembly three 19 is arranged at the middle shaft hole of the circular filter screen 7. The double-shaft motor 8 drives the filter screen 7 to rotate, so that the filter screen 7 can be prevented from being blocked. The double-shaft motor 8, the electromagnetic clutch assemblies one to three of the application are controlled by a PLC 20. The PLC 20 can selectively control the start and stop of the electromagnetic clutch assemblies one to three, so as to control the rotation start and stop of the components arranged in cooperation with the electromagnetic clutch assemblies, that is, to control the components to synchronously rotate with the motor shaft or not to synchronously rotate with the motor shaft, to keep a non-rotation state and not to be affected by the rotation of the motor shaft. The detailed connection arrangement mode of the electromagnetic clutch assemblies, the motor shaft and the components connected with the electromagnetic clutch assemblies outside, whether other auxiliary parts are used or not, all belong to the prior art in the field. The application will not be described here.

[0033] Referring to the drawings Figure 1The motor shaft two 18 passes through the filter screen 7, and an electromagnetic clutch assembly four 21 is arranged on the motor shaft two 18. The electromagnetic clutch assembly four 21 is provided with a driving gear two 22. The driving gear two 22 is connected with driven gears two 24 arranged on the two sides of the driving gear two 22 through a transmission belt two 23. The driven gears two 24 are provided with screw rods two 25. The screw rods two 25 pass through the purification layer 26 and are arranged on the base 1. The screw rods two 25 are provided with screw blocks 27. The screw blocks 27 are arranged between the screw rods two 25 and the purification layer 26. The electromagnetic clutch assembly four 21 is controlled by the PLC 20. The PLC 20 can selectively control the start and stop of the electromagnetic clutch assembly four 21, so as to control the rotation start and stop of the components arranged in cooperation with the electromagnetic clutch assembly. The PLC 20 controls the start of the double-shaft motor 8 and the electromagnetic clutch assembly four 21. The driving gear two 22 drives the rotation of the driven gears two 24 and the screw rods two 25 arranged on the driven gears two 24. The PLC 20 controls the periodic rotation of the motor shaft two 18 of the double-shaft motor 8 in the forward and reverse directions. The purification layer 26 moves up and down in the accumulated water along with the screw blocks 27 along the screw rods two 25 (only to a certain depth, or completely immersed, so as to avoid the influence of the accumulated water on the purification effect of the purification layer 26). Then, the purification layer 26 moves away from the accumulated water, that is, moves up and down in the accumulated water. The lower part of the accumulated water gives a large reverse upward impact force to the purification layer 26, so as to play a role of reverse washing of the purification layer 26. The filter residues deposited and adhered to the surface and gaps of the purification layer 26 are scattered, and the newly entered sewage is purified, so as to improve the purification effect of the subsequent sewage in real time. As described above, the purification layer 26 can be arranged in multiple layers in a spaced and separated manner. Each layer is connected with the screw rod through the screw block 27. The up-and-down movable sealing between the edge of the purification layer 26 and the base 1 adopts the prior art in the field, and will not be described in detail.

[0034] The spray pipe 2 is arranged on the screw rod one 17 in a liftable manner. The splash-proof layer 28 such as sponge is arranged on the rotating disc 9, so as to prevent the water splash from forming haze. The water inlet pipe 29 is connected to the side wall of the accumulated water part of the base 1, so as to supply water to the base 1 from outside. The pumping device 30 includes an electrically controlled double-way water outlet water pump. The other water outlet of the water pump is connected with the second water pipe 31. The water outlet of the second water pipe 31 is arranged between the sewage filtering mechanism and the sewage purification mechanism, so as to pump water to the place in the following.

[0035] Referring to Figure 1It also includes a haze extraction mechanism, which includes an electromagnetic valve 60 to control the air pump 32 of the double inlet, the air inlet pipe 33, the air duct one 34, the air duct two 35 and the air outlet pipe 36, one air inlet of the air pump 32 is connected with one end of the air inlet pipe 33, the other end of the air inlet pipe 33 is communicated with the nozzle 2, the other air inlet of the air pump 32 is communicated with the air duct, the air duct one 34 and the air duct two 35 are respectively arranged through the side wall of the base 1, the air duct one 34 is located between the filter screen 7 and the rotating disc 9, the air duct two 35 is located at the side wall corresponding to the water accumulation part of the base 1, the air outlet of the air pump 32 is connected with one end of the air outlet pipe 36, the other end of the air outlet pipe 36 is communicated with the air duct two 35. The device also includes a dust concentration sensor 37 and a haze particle sensor 38, which are respectively connected with the PLC 20, the dust concentration sensor 37 detects the dust concentration of the tunnel atmosphere in real time, when the PLC 20 determines that the concentration exceeds 50mg / m³, the PLC 20 controls the electrically controlled double-way water extraction pump to open, and water is supplied to the nozzle 2 through the first water pipe 3, the multiple nozzles 4 of the nozzle 2 spray water to the water curtain recovery mechanism, forming a water curtain, which has a dust reduction effect, when the haze particle sensor 38 detects the haze particle concentration in real time, when the PLC 20 determines that the haze particle concentration exceeds the threshold value (such as PM2.5>75μg / m³ and / or PM10>150μg / m³), the PLC 20 further determines whether the nozzle 2 is not spraying water (judged by detecting whether the nozzle 4 is opened) and has no water accumulation (detected by the water accumulation sensor 39 arranged in the nozzle 2), and then controls the air pump 32 to open, the nozzle 2 is sucked into negative pressure through the air inlet pipe 33, and the area above the water accumulation part of the base 1 is also sucked into negative pressure through the air duct two 35, the haze in the tunnel is sucked into the air pump 32 through the nozzle 2 and the base 1, and the extracted atmospheric haze is discharged into the water for filtration, the atmospheric water overflowing from the water is purified by the purification layer 26, and a certain amount of bactericidal disinfectant can be added to the water to improve the sterilization effect. As a more effective alternative, the air duct two 35 can be arranged between the filter screen 7 and the purification layer 26, and the air outlet pipe 36 enters the base 1 through the air duct two 35, the air outlet thereof is fixed on the purification layer 26 and can move up and down synchronously with the purification layer 26, when the haze is extracted, the purification layer 26 is first lowered to be immersed in the water, and the haze entering later is captured by the water and then purified by the purification layer 26 before entering the water accumulation part below the base 1.

[0036] The device also includes a laser particle sensor 40 for detecting particle concentration, a laser turbidity meter 41, and a PLC 20. The laser particle sensor 40 and the laser turbidity meter 41 are arranged between the filter screen 7 and the purification layer 26, and detect the impurity load of the raw water entering the purification layer 26 in real time and transmit it to the PLC 20. For example, when the PLC 20 determines that the particle concentration is greater than 5 mg / L or the turbidity is greater than 5 NTU, the control-controlled double-way water outlet pump is controlled to supply emergency water between the filter screen 7 and the purification layer 26 through the second water pipe 31, so as to reduce the purification load. This step is the pretreatment monitoring.

[0037] The device also includes a differential pressure sensor group 42 arranged on the upper and lower surfaces of the coarse filtration interception layer 53, for detecting the sewage pressure before and after the coarse filtration interception layer 53 filters in real time and transmitting it to the PLC 20. When the PLC 20 determines that the pressure difference is greater than 0.15 MPa, it is determined that the coarse filtration interception layer 53 is saturated, and the PLC 20 controls the purification layer 26 to move up and down in the accumulated water along the screw block 27 and the screw rod 2, which plays a role in reverse flushing the coarse filtration interception layer 53. This step is the purification layer performance monitoring.

[0038] The device also includes a ferromagnetic particle counter group 43 arranged between the magnetic flocculation layer 54 and the ultra-fine filtration layer 55, which detects the magnetic particle concentration in real time and transmits it to the PLC 20. When the PLC 20 determines that the magnetic particle concentration is greater than 2 mg / L, it is determined that the magnetic flocculation layer 54 needs to be maintained. An electromagnetic pulse generator 44 is arranged in the magnetic flocculation layer 54. When the electromagnetic pulse generator 44 is turned on, the magnetic ceramic is vibrated and desorbed by using a 1 Hz high-frequency pulse magnetic field. At the same time, the PLC 20 controls the purification layer 26 to move up and down in the accumulated water along the screw block 27 and the screw rod 2, which plays a role in reverse flushing the coarse filtration interception layer 53. This step is the purification layer performance monitoring.

[0039] The device also includes a Zeta potential instrument 45 and a TOC sensor 46 arranged between the ultra-fine filtration layer 55 and the antibacterial disinfection layer 56. The Zeta potential instrument 45 detects the colloidal residue in real time, and the TOC sensor 46 detects the total organic carbon concentration in real time, and transmits them to the PLC 20 in real time. When the PLC 20 determines that the absolute value of the colloidal Zeta potential is less than 20 mV or the TOC is greater than 3 mg / L, it is determined that the ultra-fine filtration layer 55 is saturated, and the PLC 20 controls the double-shaft motor 8 and the electromagnetic clutch assembly four 21 to be turned on. The driven gear two 24 and the screw rod two 25 thereon are rotated by the driving gear two 22. The PLC 20 sets the motor shaft two 18 of the double-shaft motor 8 to rotate periodically in forward and reverse directions. The purification layer 26 moves up and down in the accumulated water along the screw block 27 and the screw rod 2, which plays a role in reverse flushing the coarse filtration interception layer 53. This step is the purification layer performance monitoring.

[0040] The device further comprises a fluorescent biological sensor 47, an electric conductivity sensor 48, a laser turbidimeter 49 and a residual chlorine sensor 50 arranged in the water accumulation part, the fluorescent biological sensor 47 is used for detecting the total number of bacteria and virus titer, the residual chlorine sensor 50 is used for detecting the chlorine concentration in the water body, the electric conductivity sensor 48 is used for detecting the content of dissolved salts (such as calcium ions, magnesium ions, chloride ions, etc.) in the water, and the oil sensor is used for detecting the oil content in the water body. The above sensors are connected with the PLC 20. For example, if the total number of bacteria is less than 100 CFU / mL, the virus titer is less than 50 pfu / mL, the turbidity is less than 1 NTU, the oil concentration is less than 5 mg / L, and the electric conductivity is less than 500 μS / cm, it is determined that the water body is qualified. If one of them does not meet the requirement, the PLC 20 controls the second water pipe 31 to pump the water into the space between the filter screen 7 and the purification layer 26 for re-purification, and controls the first water pipe 3 to stop water output at the same time. When re-purification is performed, if the microbial indicators exceed the standard, the irradiation time of the ultraviolet lamp is controlled to be extended until the water meets the standard. In addition, if the chlorine concentration of 0.05-0.3 mg / L does not meet the requirement, it is determined that the chlorine-containing disinfecting sheet built in the polyvinyl chloride grid plate needs to be replaced. At the same time, when it is determined that the purified water body is unqualified, the step of moving the purification layer 26 along with the screw block 27 up and down in the water accumulation part along the second screw rod 25 for reverse flushing of the purification layer 26 is further included. The step is the final inspection before circulation.

[0041] The device further comprises a water level sensor one 51 and a water level sensor two 52 arranged at different heights in the water accumulation part, and the two sensors are respectively connected with the PLC 20. When the water level is lower than the water level sensor one 51, the PLC 20 opens the electromagnetic valve 60, and the external water pipe supplies water into the base 1. When the water level is higher than the water level sensor two 52, the PLC 20 closes the electromagnetic valve 60, and the external water pipe stops supplying water.

[0042] For the detection of the purification layer 26, the present scheme realizes the standard determination of recycled water after purification and the automatic treatment of unqualified water through multi-stage linkage detection + dynamic closed-loop adjustment mechanism. The core lies in upgrading the traditional single detection (only detecting the water quality after purification is completed) to the whole process management and control of “pre-treatment monitoring-purification layer efficiency monitoring-final inspection before circulation”, and combining the self-cleaning of the purification layer 26 with the hierarchical maintenance triggering logic to solve the pain point of “passive maintenance after the purification effect is out of control” caused by only detecting the water quality after purification in the prior art, that is, breaking through the passive mode of traditional “detection-alarm”, realizing the whole cycle management and control of “prevention-adjustment-maintenance” through three-stage detection and hierarchical treatment, and prolonging the service life of consumables by more than 30% through the self-cleaning of the purification layer 26 and the dynamic water replenishment mechanism.

[0043] All the PLCs 20 in the above-mentioned application are used for determining the threshold value of the standard, which is pre-stored in the PLC 20 and can also be manually inputted and modified.

[0044] The dust removal method of the device of the present application comprises the following steps: 1) Determine whether it is necessary to turn on the water curtain and / or remove smog based on the detection value. If both are required, turn on the water curtain first. 2) After the water curtain is turned on, during the pretreatment monitoring stage, the system will determine in real time whether the purification load needs to be reduced in the pretreatment monitoring step based on the detection value. If so, emergency water will be added between the filter screen 7 and the purification layer 26.

[0045] 3) During the purification layer performance monitoring stage, the working status of each layer in the purification layer 26 is judged in real time based on the detection value. If the status is abnormal, the backwashing mode is turned on, which can filter while backwashing, and at the same time and / or issue alarms such as inspection and repair materials. 4) During the final inspection stage before circulation, the purified water is judged in real time based on the test values. If it is not qualified, the microbial content is analyzed first. If so, the PLC20 controls the extension of the ultraviolet lamp irradiation time. 5) Based on step 4), the residual chlorine concentration in the accumulated water is analyzed to see if it meets the requirements. If it does not meet the requirements, it is determined that the chlorine disinfectant tablets built into the PVC mesh panel need to be replaced, and an alarm is issued. 6) Based on the completion of steps 4)-5), control the second water pipe 31 to pump the accumulated water into the space between the filter screen 7 and the purification layer 26 for re-purification, and at the same time control the stop of water output from the first water pipe 3; 7) Based on the start of step 6), the backwash mode is started simultaneously, which can filter while backwashing, thus improving the purification effect; 8) If the detection value indicates that smog extraction is needed, and it is detected that the water curtain is not turned on, first check whether there is water accumulation inside the spray nozzle; 9) If there is no water accumulation in the spray nozzle, turn on the fog extraction mode until the fog concentration meets the requirements or the water curtain needs to be turned on. 10) During the above steps, PLC20 ensures that the water level is within a reasonable range by using water level detection data.

[0046] The above steps are programmed into the PLC20 to achieve automated mechanical control.

Claims

1. An atmospheric dust removal device for subway tunnel construction, comprising a base (1) and a water curtain mechanism, characterized in that, It also includes a rotating lifting mechanism, the water curtain mechanism is rotatably arranged on the base (1) through the rotating lifting mechanism, the base (1) is provided with a water curtain recovery mechanism, a sewage filtering mechanism and a sewage purification mechanism, the water curtain recovery mechanism recovers the water curtain, is used for filtering of the sewage filtering mechanism and purification of the sewage purification mechanism, and the purified water reenters the water curtain mechanism; The water curtain mechanism comprises a spray pipe (2) in the shape of a vertical section The water curtain mechanism comprises a spray pipe (2) in the shape of a vertical section The water curtain recovery mechanism comprises a water hole (5) formed in the base (1), and the water curtain flows to the sewage filtering mechanism through the water hole (5); and the sewage filtering mechanism comprises a filter screen (7) arranged in the base (1).

2. The atmospheric dust removing device for subway tunnel construction according to claim 1, wherein The rotating lifting mechanism comprises a double-shaft motor (8), a rotating disc (9) and a screw rod, an annular hole (10) is formed in an end wall of the base (1) facing the spray pipe (2), and an end wall portion in the annular hole (10) constitutes the rotating disc (9); a motor shaft one (11) of the double-shaft motor (8) is provided with an electromagnetic clutch assembly one (12) and an electromagnetic clutch assembly two (13); the electromagnetic clutch assembly one (12) is provided with a driving gear one (14); the driving gear one (14) is connected with driving gears one (16) located on both sides of the driving gear one (14) through a transmission belt one (15); the driving gears one (16) are provided with a screw rod one (17); the screw rod one (17) passes through the rotating disc (9); the spray pipe (2) is arranged on the screw rod one (17) in a lifting manner; the electromagnetic clutch assembly two (13) is arranged at a central axial hole of the rotating disc (9); a motor shaft two (18) of the double-shaft motor (8) is provided with an electromagnetic clutch assembly three (19); and the electromagnetic clutch assembly three (19) is arranged at a central axial hole of the circular filter screen (7).

3. The atmospheric dust removing device for subway tunnel construction according to claim 2, wherein After the motor shaft two (18) passes through the filter screen (7), the motor shaft two (18) is provided with an electromagnetic clutch assembly four (21); the electromagnetic clutch assembly four (21) is provided with a driving gear two (22); the driving gear two (22) is connected with driving gears two (24) located on both sides of the driving gear two (22) through a transmission belt two (23); the driving gears two (24) are provided with a screw rod two (25); the screw rod two (25) passes through the sewage purification mechanism and is arranged on the base (1); the screw rod two (25) is provided with a screw block (27); and the screw block (27) is arranged between the screw rod two (25) and a purification layer (26).

4. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 1, wherein The mist extraction mechanism comprises an electromagnetic valve (60) controlling a gas pump (32) with double air inlets, an air inlet pipe (33), an air passage one (34), an air passage two (35) and an air outlet pipe (36); one air inlet of the gas pump (32) is connected with one end of the air inlet pipe (33); the other end of the air inlet pipe (33) is communicated with the spray pipe (2); the other air inlet of the gas pump (32) is communicated with the air passages; the air passage one (34) and the air passage two (35) are arranged through the side walls of the base (1) respectively; the air passage one (34) is located between the filter screen (7) and the rotating disc (9); the air passage two (35) is located at the side wall of the base (1); the air outlet of the gas pump (32) is connected with one end of the air outlet pipe (36); and the air outlet pipe (36) is communicated with the water collecting part of the base (1) through the air passage two (35).

5. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 2, wherein The pumping device (30) comprises an electrically-controlled double-way water outlet water pump, and the other water outlet of the water pump is connected with the second water pipe (31), and the water outlet of the second water pipe (31) is arranged between the sewage filtering mechanism and the sewage purifying mechanism.

6. The atmospheric dust removing device for subway tunnel construction according to claim 4, wherein The air outlet pipe (36) is arranged on the sewage purifying mechanism and between the sewage filtering mechanism and the sewage purifying mechanism after penetrating through the air passage two (35).

7. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 1, wherein The rotating disc (9) is provided with a splash-proof layer (28), and a water delivery pipe (29) is connected to the side wall corresponding to the water accumulation part of the base (1). The device is provided with a roller (59) at the bottom and a push handle at the side wall. The base (1) is a hollow cylinder, and the edge of the upper end surface is protruded to form an annular flange (6) for blocking the splashing water. The "L"-shaped spray pipe (2) is arranged along the radial direction of the rotating disc (9).

8. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 1, wherein The sewage purifying mechanism comprises a laminated purifying layer (26) arranged in the base (1) below the filter screen (7), and the purifying layer (26) comprises a coarse filtering and intercepting layer (53) for intercepting silt particles and fiber impurities not less than 20 μm, a magnetic flocculation layer (54) for adsorbing iron-containing magnetic particles and strengthening colloid coagulation, an ultra-fine filtering layer (55) for intercepting 1-20 μm fine dust and colloid, an antibacterial and disinfecting layer (56), an adsorbing and purifying layer (57) for adsorbing oil stains, removing peculiar smell and part of heavy metals, and a slow-release and scale-inhibiting layer (58) for preventing calcium and magnesium ion scale.

9. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 1, wherein The other side wall of the spray pipe (2) is also provided with a plurality of nozzles (4) in the form of Venturi tubes, and each nozzle (4) is provided with an electromagnetic valve (60), and the electromagnetic valve (60), the pumping device (30), the air pump (32), the electromagnetic clutch assembly and the double-shaft motor (8) are connected with the PLC (20).

10. The atmospheric dust removing apparatus for subway tunnel construction as claimed in claim 8, wherein The device further comprises a dust concentration sensor (37), a haze particle sensor (38) and an accumulated water sensor (39), and further comprises a water level sensor one (51) and a water level sensor two (52) arranged at different heights of the accumulated water part and connected with the PLC (20) respectively, the dust concentration sensor (37) detects the dust concentration of the tunnel atmosphere in real time, the haze particle sensor (38) detects the haze particle concentration in real time, and the accumulated water sensor (39) detects whether there is accumulated water in the spray pipe (2).

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