A spray dust suppression system for a long tunnel and its working method

Abstract

The present invention discloses a long and large tunnel spray dust reduction system and its working method. The spray dust removal system includes a front-end atomizing dust removal system arranged on an excavation trolley at a set distance from the face and multiple full-section atomizing dust removal systems arranged at intervals on the tunnel primary branch along the direction of polluted air discharge. The atomizing dust removal system includes multiple high-pressure atomizing nozzles arranged at intervals, which are all connected to the main pipe. The main pipe is connected to the high-pressure air supply pipe and the high-pressure water supply pipe respectively through a three-way pipe. The high-pressure air supply pipe and the high-pressure water supply pipe are both provided with wireless control gate valves. Multiple high-pressure atomizing nozzles are arranged in the direction of tunnel excavation and form a water curtain in the tunnel surface to achieve rapid dust removal. The present invention uses water mist to effectively fuse the dust and ammonium nitrate suspended in the air, so that the water mist gathers to form water droplets that quickly fall to the ground, so that the dust concentration in the construction tunnel meets the national standard requirements, and achieves the purpose of rapid dust reduction and improving air quality.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and more specifically, to a spray dust reduction system for a long tunnel and a working method thereof. Background Art

[0002] At present, most construction tunnels use mechanical ventilation to dilute the dust concentration, but the dust pollutes the entire tunnel under the action of wind flow. As the face continues to advance, fresh air needs to be introduced from the outside of the tunnel thousands of meters away, which requires high energy consumption and large ventilation resistance, making it difficult to achieve rapid dust reduction and dust removal. Field investigations have found that the purification effect of using simple ventilation technology is not obvious, and the dust in the construction tunnel has not been effectively controlled. Therefore, purification and dust removal in the construction tunnel, improving air quality, and optimizing the construction environment have become problems that need to be solved urgently. Summary of the invention

[0003] One object of the present invention is to provide a long and large tunnel spray dust reduction system and a working method thereof. A spray dust reduction system is used in the construction of a long and large tunnel. During tunnel blasting or shotcrete construction, water mist is used to effectively fuse dust and ammonium nitrate suspended in the air, so that the water mist gathers to form water droplets that quickly fall to the ground, aiming to make the dust concentration in the construction tunnel meet national standards, achieve the purpose of rapid dust reduction and improve air quality, and at the same time prevent and reduce the occurrence of occupational diseases.

[0004] In order to solve the above technical problems, the present invention provides a spray dust reduction system for a long tunnel, including a front-end atomizing dust removal system arranged on an excavation trolley at a set distance from the heading face and a plurality of full-section atomizing dust removal systems arranged at intervals on the primary branch of the tunnel along the direction of polluted air discharge. The atomizing dust removal systems each include a plurality of high-pressure atomizing nozzles arranged at intervals, which are all connected to a main pipe, and the main pipe is respectively connected to a high-pressure air supply pipe and a high-pressure water supply pipe through a tee. The high-pressure air supply pipe and the high-pressure water supply pipe are both provided with wireless control gate valves. The plurality of high-pressure atomizing nozzles are arranged in the direction of tunnel excavation and form a water curtain on the tunnel surface to achieve rapid dust removal.

[0005] Preferably, it also includes an automatic tunnel air quality monitoring system and an intelligent control system arranged on the tunnel wall, wherein one automatic tunnel air quality monitoring system is arranged corresponding to each atomizing dust removal system, and the automatic tunnel air quality monitoring system is used to monitor the tunnel air quality parameters in real time. The intelligent control system includes a parameter acquisition module, a storage module, a comparison module and a control module. The parameter acquisition module acquires the tunnel air quality parameters monitored by the automatic tunnel air quality monitoring system in real time, and the storage module stores the air quality design parameters. The comparison module is used to compare the monitored tunnel air quality parameters with the air quality design parameters, and send the comparison results to the control module. The control module controls the opening and closing and the opening size of the wireless control gate valves arranged on the high-pressure air supply pipe and the high-pressure water supply pipe according to the comparison results.

[0006] Preferably, a result classification unit and a plurality of control units are provided in the control module, the result classification unit is used to divide the comparison results into a plurality of groups corresponding to a plurality of control units respectively, the opening size of the wireless control gate valve has a plurality of gears, and the plurality of control units respectively control the opening and closing and opening of the wireless control gate valve at different gears.

[0007] Preferably, the high-pressure atomizing nozzle is directed toward the direction of polluted air discharge at an angle of 45° to 60° to the tunnel axis.

[0008] Preferably, the front-end atomizing dust removal system is no more than 100m away from the tunnel face, and the full-section atomizing dust removal system is spaced 350m to 400m apart.

[0009] Preferably, the multiple high-pressure atomizing nozzles corresponding to the front-end atomizing dust removal system are evenly spaced along the side and front of the excavation trolley, with a spacing of 0.8m to 1m; the multiple high-pressure atomizing nozzles corresponding to the full-section atomizing dust removal system are evenly spaced along the circumference of the tunnel primary branch, with a spacing of 0.8m to 1m.

[0010] Preferably, several embedded parts are pre-embedded on the primary support of the tunnel in advance, and the multiple embedded parts that are arranged at intervals along the tunnel contour in the circumferential direction and along the axial direction of the tunnel are located in the same straight line. Rebars are used to make multiple reinforced arch skeletons along the tunnel contour, and the multiple reinforced arch skeletons are connected to the embedded parts through multiple connecting pieces according to the set installation position of the full-section atomizing dust removal system. The main pipe equipped with multiple high-pressure atomizing nozzles is fixed to the reinforced skeleton to complete the installation of the high-pressure atomizing nozzles. The bottom of the embedded part is embedded and fixed in the primary support of the tunnel, and the top of the embedded part is located outside the primary support of the tunnel. The top of the embedded part is a rotatably connected annular part, and the connecting part is a rod-shaped structure, at least one end of which is just inserted into the annular part at the top of the embedded part along the axial direction of the tunnel, and the reinforced arch skeleton is fixedly connected to multiple connecting pieces.

[0011] Preferably, the connecting member is a screw rod, on which a nut is threadedly provided, the outer circumference of the nut is a truncated cone, and the connecting member is locked in the annular member through the outer circumference of the nut.

[0012] The present invention also provides a working method of a long tunnel spray dust reduction system, comprising the following steps:

[0013] Step 1: Install and lay out the corresponding long tunnel spray dust suppression system at the corresponding position in the tunnel according to the structure of the long tunnel spray dust suppression system;

[0014] Step 2: During the tunnel construction process, the automatic air quality monitoring system of each tunnel transmits the real-time monitored tunnel air quality parameters to the intelligent control system in real time. The intelligent control system controls the atomization dust removal system in the corresponding section to perform atomization dust removal. When the air pollutant content in the tunnel exceeds the specified value, the intelligent control system sends an opening signal to the wireless control gate valve. At this time, high-pressure water and high-pressure wind are supplied to the high-pressure atomization nozzle, and the high-pressure atomization nozzle starts to spray dust reduction, so that the air quality in the tunnel meets the specified requirements; when the air pollutant content in the tunnel is lower than the specified value, the intelligent control system sends a closing signal to the wireless control gate valve. At this time, high-pressure water and high-pressure wind stop being supplied to the high-pressure atomization nozzle, and the high-pressure atomization nozzle stops spraying dust reduction.

[0015] Preferably, the specific method of controlling the intelligent control system is:

[0016] First, the parameter acquisition module acquires the tunnel air quality parameters monitored by the tunnel air quality automatic monitoring system in real time and transmits them to the comparison module;

[0017] Secondly, the comparison module compares the monitored tunnel air quality parameters with the air quality design parameters stored in the storage module, and sends the comparison results to the control module;

[0018] Finally, the control module divides the comparison results into multiple groups through the result classification unit therein. The comparison results are divided into multiple step ranges according to the numerical values ​​to form multiple groups, and multiple control controls are used to correspond to the multiple groups of comparison results, and the corresponding wireless control gate valve is opened and closed and opened at different gears.

[0019] The present invention has at least the following beneficial effects:

[0020] 1. Reduce ventilation pressure and effectively improve the dust reduction efficiency of the tunnel: A high-pressure pneumatic atomizing nozzle is set on the side of the excavation trolley and about 100m away from the tunnel face. The existing high-pressure water in the tunnel is integrated into the high-pressure gas to form two dust removal water curtains, and a full-range water mist is formed within 100m of the tunnel face, which can effectively prevent the dust and harmful gases after blasting from moving backwards, and effectively integrate with dust and ammonium nitrate to achieve the purpose of rapid dust reduction and air purification. Compared with the previous solution, the single dust removal efficiency is improved by about 10min.

[0021] 2. Improve the working environment of workers and improve work efficiency: According to the comparison of air quality detection after on-site blasting, the air quality in the tunnel invert, secondary lining and other areas has been significantly improved compared with before implementation in the same period of time, which effectively reduces the construction quality of various areas during tunnel blasting and shotcrete spraying, helps to improve the working environment of workers, protect workers' health, and improve work efficiency, with obvious economic and social benefits.

[0022] 3. Wide scope of application: The overall structure is simple, the construction is convenient, and the process is highly operable. It can be widely used in various long tunnels. The layout position can be reasonably selected according to the tunnel ventilation method to achieve the purpose of automatic start and stop, automatic spraying, and intelligent control.

[0023] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The plan view of the tunnel spray dust suppression system of the present invention;

[0025] Figure 2 It is a schematic elevation view of the front-end atomization dust removal system of the present invention;

[0026] Figure 3 It is a schematic elevation diagram of the full-section atomizing dust removal system of the present invention;

[0027] Figure 4 This is a schematic diagram of the tunnel plane structure of the present invention;

[0028] Figure 5 It is an enlarged view of the structure of the embedded part of the present invention.

[0029] Description of reference numerals:

[0030] 1. Front-end atomization dust removal system, 2. Full-section atomization dust removal system, 3. Intelligent control system, 4. High-pressure atomization nozzle, 5. Excavation trolley, 6. Tunnel primary support, 7. Tunnel air quality automatic monitoring system, 8. Wireless control gate valve, 9. High-pressure water supply pipe, 10. High-pressure air supply pipe, 11. Embedded parts, 12. Steel arch frame, 13. Connectors, 14. Nuts, 15. Ring parts. DETAILED DESCRIPTION

[0031] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] like Figures 1 to 3 As shown, the present invention provides a spray dust reduction system for a long tunnel, including a front-end atomizing dust removal system 1 arranged on an excavation trolley 5 at a set distance from the heading face, and a plurality of full-section atomizing dust removal systems 2 arranged at intervals on the tunnel primary branch 6 along the direction of polluted air discharge, the atomizing dust removal systems each include a plurality of high-pressure atomizing nozzles 4 arranged at intervals, all of which are connected to a main pipe, the main pipe is respectively connected to a high-pressure air supply pipe 10 and a high-pressure water supply pipe 9 through a tee, the high-pressure air supply pipe 10 and the high-pressure water supply pipe 9 are both provided with a wireless control gate valve 8, the plurality of high-pressure atomizing nozzles 4 are arranged toward the tunnel excavation direction and form a water curtain in the tunnel surface to achieve rapid dust removal.

[0034] The present application forms a dust removal water curtain by setting up a front-end atomizing dust removal system 1 near the excavation face. During tunnel blasting or shotcrete spraying construction, water mist is used to effectively fuse the dust and ammonium nitrate suspended in the air, so that the water mist gathers to form water droplets that quickly fall to the ground. At the same time, multiple full-section atomizing dust removal systems 2 are arranged at intervals along the direction of polluted air discharge to reduce a large amount of high-concentration dust and other pollutants generated by drilling, blasting, slag transportation and shotcrete spraying during drilling and blasting excavation, reduce the harm of smoke and toxic and harmful gases to the human body, meet the occupational health standards of construction sites, protect the physical and mental health of construction personnel, accelerate the safe and efficient production of enterprises, and reduce the dust concentration in the construction process to within the standard limit.

[0035] In another technical solution, it also includes a tunnel air quality automatic monitoring system 7 and an intelligent control system 3 arranged on the tunnel wall, wherein the tunnel air quality automatic monitoring system 7 is arranged one for each atomization dust removal system, and the tunnel air quality automatic monitoring system 7 is used to monitor the tunnel air quality parameters in real time, and the intelligent control system 3 includes a parameter acquisition module, a storage module, a comparison module and a control module, wherein the parameter acquisition module acquires the tunnel air quality parameters monitored by the tunnel air quality automatic monitoring system 7 in real time, and the storage module stores the air quality design parameters, and the comparison module is used to compare the monitored tunnel air quality parameters with the air quality design parameters, and send the comparison results to the control module, and the control module controls the opening and closing and opening size of the wireless control gate valve 8 arranged on the high-pressure air supply pipe 10 and the high-pressure water supply pipe 9 according to the comparison results. The control module is provided with a result classification unit and a plurality of control units, wherein the result classification unit is used to divide the comparison results into a plurality of groups corresponding to a plurality of control units respectively, and the opening size of the wireless control gate valve 8 has a plurality of gears, and the plurality of control units respectively control the opening and closing and opening of the wireless control gate valve 8 at different gears.

[0036] By using the existing tunnel air quality automatic monitoring system 7, the start and stop of the atomizing nozzle and the injection pressure (i.e., the opening size) are automatically adjusted through the intelligent control system 3 according to the changes in air quality, thereby achieving the purpose of automatic start and stop, automatic spraying, and intelligent management and control. The tunnel air quality automatic monitoring system 7 is set up one for each atomizing dust removal system, and the intelligent control system 3 is set up one for simultaneously controlling multiple atomizing dust removal systems in multiple sections.

[0037] In another technical solution, the high-pressure atomizing nozzle 4 is at an angle of 45° to 60° to the tunnel axis in the direction of the polluted air discharge. The front-end atomizing dust removal system 1 is no more than 100m away from the face, and the multiple high-pressure atomizing nozzles 4 corresponding to the front-end atomizing dust removal system 1 are evenly spaced along the side and front of the excavation trolley 5, with a spacing of 0.8m to 1m. The full-section atomizing dust removal system 2 is spaced 350m to 400m apart, and the multiple high-pressure atomizing nozzles 4 corresponding to the full-section atomizing dust removal system 2 are evenly spaced along the primary branch 6 of the tunnel, with a spacing of 0.8m to 1m.

[0038] Within 100m from the tunnel face, a front-end atomizing dust removal system 1 is installed on the excavation trolley 5; along the direction of polluted air discharge in the tunnel, an intermittent full-section atomizing dust removal system 2 is added at intervals of 400m; the front-end atomizing dust removal system 1 is arranged on the excavation trolley 5, and consists of a high-pressure atomizing nozzle 4, an automatic tunnel air quality monitoring system 7, a wireless control gate valve 8, a high-pressure water supply pipe 9, and a high-pressure air supply pipe 10; the high-pressure atomizing nozzle 4 in the front-end atomizing dust removal system 1 is arranged at intervals of 1m along the contour of the excavation trolley 5, and the angle between the high-pressure atomizing nozzle 4 in the polluted air discharge direction and the tunnel axis direction is 45° to 60°. The intermittent full-section atomizing dust removal system 2 is arranged on the tunnel primary branch 6, and is composed of a high-pressure atomizing nozzle 4, a tunnel air quality automatic monitoring system 7, a wireless control gate valve 8, a high-pressure water supply pipe 9, and a high-pressure air supply pipe 10; the high-pressure atomizing nozzle 4 in the intermittent full-section atomizing dust removal system 2 is arranged at intervals of 1m along the contour of the tunnel primary branch 6, and the angle between the high-pressure atomizing nozzle 4 and the tunnel axis direction in the direction of polluted air discharge is 45° to 60°.

[0039] The setting size of the 4 angles of the high-pressure atomizing nozzle is based on the empirical value of the field test, as well as through calculation and practical verification. It is mainly to ensure the dust reduction effect (forming a curtain) on the one hand, and to avoid loss of smoke exhaust speed on the other hand. If the 4-angle vertical spray of the high-pressure atomizing nozzle has a greater impact on the smoke exhaust speed, dust accumulation and slow smoke exhaust speed will occur; if the 4-angle spray of the high-pressure atomizing nozzle is along the axis of the tunnel, the dust reduction effect is not very obvious, but the overall smoke exhaust speed is not affected. Therefore, it is necessary to reasonably set the 4 angles and spacing of the high-pressure atomizing nozzle.

[0040] When the construction excavation has been going on for a period of time, when the distance between the front-end atomizing dust removal system 1 and the adjacent full-section atomizing dust removal system 2 exceeds the set distance, or when the air quality controlled by the intelligent control system 3 cannot meet the specification requirements, a full-section atomizing dust removal system 2 of another section is added. The air quality parameter is mainly inhalable particulate matter.

[0041] In another technical solution, Figure 4As shown, several embedded parts 11 are pre-embedded on the tunnel primary support 6, and the multiple embedded parts 11 arranged at intervals along the tunnel contour and along the axial direction of the tunnel are located on the same straight line. Rebars are used to make multiple reinforced arch skeletons 12 along the tunnel contour, and the multiple reinforced arch skeletons 12 are connected to the embedded parts 11 through multiple connecting members 13 according to the set installation position of the full-section atomizing dust removal system. The main pipe provided with multiple high-pressure atomizing nozzles is fixed on the reinforced skeleton to complete the installation of the high-pressure atomizing nozzles. The bottom of the embedded part 11 is embedded and fixed in the tunnel primary support 6, and the top of the embedded part 11 is located outside the tunnel primary support 6. The top of the embedded part 11 is a rotatably connected annular part 15, and the connecting member 13 is a rod-shaped structure, at least one end of which is just inserted into the annular part 15 at the top of the embedded part 11 along the axial direction of the tunnel, and the reinforced arch skeleton 12 is fixedly connected to the multiple connecting members 13.

[0042] The steel arch frame 12 is made on site along the tunnel contour using steel bars, and then the main pipe connected with the high-pressure air supply pipe and the high-pressure water supply pipe and the high-pressure atomizing nozzle thereon are fixed on the steel arch frame 12. The embedded parts 11 only need to be in the same straight line along the tunnel axis, and no special requirements are made on whether they are in the same annular direction along the tunnel ring direction, so as to ensure more convenient embedded construction. The setting of the embedded parts 11 can make the installation of the steel arch frame 12 simpler and faster, and there is no need to drill holes or other operations on the tunnel primary support 6 again. Each steel arch frame 12 is provided with a plurality of connecting pieces 13 spaced circumferentially. When the position of the steel arch frame 12 is far from the embedded parts 11 on both sides, the two ends of the connecting piece 13 are respectively inserted into the ring pieces 15 at the top of the embedded parts 11 on both sides to achieve positioning and fixing, and then the steel arch frame 12 is fixed to the connecting piece 13 by welding or other fixing methods; when the position of the steel arch frame 12 is close to the embedded parts 11 on one side, one end of the connecting piece 13 is inserted into the ring piece 15 at the top of the embedded part 11 that is closer to the distance, and then the steel arch frame 12 is fixed to the connecting piece 13 by welding or other fixing methods. The embedded parts 11 along the tunnel axis will not be able to be accurately in the same straight line during construction, so the ring piece 15 on the embedded part 11 is set to rotate to adapt to the linear connecting piece 13 can be inserted into it to better adapt to the installation of the steel arch frame 12.

[0043] In another technical solution, Figure 5 As shown, the connecting member 13 is a screw rod, on which a nut 14 is provided with a threaded fit, and the outer periphery of the nut 14 is truncated, and the connecting member 13 is locked in the ring member 15 through the outer periphery of the nut 14. In order to fix the position of the connecting member 13, after the connecting member 13 is inserted into the ring member 15, the outer peripheral inclined surface of the nut 14 is rotated to lock it in the ring member 15 to fix the position of the connecting member 13.

[0044] The present invention also provides a working method of a long tunnel spray dust reduction system, comprising the following steps:

[0045] Step 1: Install and lay out the corresponding long tunnel spray dust suppression system at the corresponding position in the tunnel according to the structure of the long tunnel spray dust suppression system;

[0046] Step 2: During the tunnel construction process, the automatic air quality monitoring system 7 of each tunnel transmits the real-time monitored tunnel air quality parameters to the intelligent control system 3 in real time. The atomization dust removal system in the corresponding section is controlled by the intelligent control system 3 to perform atomization dust removal. When the content of air pollutants in the tunnel exceeds the specified value, the intelligent control system 3 sends an opening signal to the wireless control gate valve 8. At this time, high-pressure water and high-pressure wind are supplied to the high-pressure atomization nozzle 4, and the high-pressure atomization nozzle 4 starts to spray dust reduction, so that the air quality in the tunnel meets the specified requirements; when the content of air pollutants in the tunnel is lower than the specified value, the intelligent control system 3 sends a closing signal to the wireless control gate valve 8, and the high-pressure water and high-pressure wind stop being supplied to the high-pressure atomization nozzle 4, and the high-pressure atomization nozzle 4 stops spraying dust reduction.

[0047] The specific control method of the intelligent control system 3 is:

[0048] First, the parameter acquisition module acquires the tunnel air quality parameters monitored by the tunnel air quality automatic monitoring system 7 in real time and transmits them to the comparison module;

[0049] Secondly, the comparison module compares the monitored tunnel air quality parameters with the air quality design parameters stored in the storage module, and sends the comparison results to the control module;

[0050] Finally, the control module divides the comparison results into multiple groups through the result classification unit therein, and the comparison results are divided into multiple step ranges according to the numerical values ​​to form multiple groups, and multiple control controls are used to correspond to the multiple groups of comparison results, and the wireless control gate valve 8 is correspondingly controlled to open and close and open different gears. For example, the comparison result has multiple nodes, and the numerical values ​​are A, B, C, and D from large to small, and the gears of the wireless control gate valve 8 are fully open, first gear, second gear, third gear, and closed from large to small. If the comparison result is greater than A, the wireless control gate valve 8 is fully open; if the comparison result is within the range of AB, the wireless control gate valve 8 is opened in the first gear; if the comparison result is within the range of BC, the wireless control gate valve 8 is opened in the second gear; if the comparison result is within the range of CD, the wireless control gate valve 8 is opened in the third gear; if the comparison result is less than D, the wireless control gate valve 8 is closed.

[0051] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily implemented, so without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A long tunnel spray dust suppression system, characterized in that: It includes a front-end atomizing dust removal system arranged on an excavation trolley at a set distance from the tunnel face and multiple full-section atomizing dust removal systems arranged at intervals on the primary branch of the tunnel along the direction of polluted air discharge. The atomizing dust removal systems include multiple high-pressure atomizing nozzles arranged at intervals, which are all connected to the main pipe. The main pipe is respectively connected to the high-pressure air supply pipe and the high-pressure water supply pipe through a tee. The high-pressure air supply pipe and the high-pressure water supply pipe are both provided with wireless control gate valves. Multiple high-pressure atomizing nozzles are arranged in the direction of tunnel excavation and form a water curtain in the tunnel face to achieve rapid dust removal; It also includes a tunnel air quality automatic monitoring system and an intelligent control system arranged on the tunnel wall, wherein one tunnel air quality automatic monitoring system is arranged corresponding to each atomizing dust removal system, and the tunnel air quality automatic monitoring system is used to monitor tunnel air quality parameters in real time. The intelligent control system includes a parameter acquisition module, a storage module, a comparison module and a control module, wherein the parameter acquisition module acquires tunnel air quality parameters monitored by the tunnel air quality automatic monitoring system in real time, and the storage module stores air quality design parameters, and the comparison module is used to compare the monitored tunnel air quality parameters with the air quality design parameters, and send the comparison results to the control module, and the control module controls the opening and closing and the opening size of the wireless control gate valves arranged on the high-pressure air supply pipe and the high-pressure water supply pipe according to the comparison results; The control module is provided with a result classification unit and a plurality of control units, the result classification unit is used to classify the comparison results into a plurality of groups corresponding to a plurality of control units respectively, the opening size of the wireless control gate valve has a plurality of gears, and the plurality of control units respectively control the opening and closing and opening of the wireless control gate valve to different gears; The multiple high-pressure atomizing nozzles corresponding to the front-end atomizing dust removal system are evenly spaced along the side and front of the excavation trolley, with a spacing of 0.8m~1m; the multiple high-pressure atomizing nozzles corresponding to the full-section atomizing dust removal system are evenly spaced along the primary branch of the tunnel, with a spacing of 0.8m~1m; Several embedded parts are pre-embedded on the primary support of the tunnel in advance, and the multiple embedded parts arranged along the tunnel contour in an annular direction and arranged along the axial direction of the tunnel are located on the same straight line. Rebars are used to make multiple reinforced arch skeletons along the tunnel contour. According to the set installation position of the full-section atomization dust removal system, the multiple reinforced arch skeletons are connected to the embedded parts through multiple connecting pieces. The main pipe provided with multiple high-pressure atomization nozzles is fixed on the reinforced skeleton to complete the installation of the high-pressure atomization nozzles. The bottom of the embedded part is pre-embedded and fixed in the primary support of the tunnel, and the top of the embedded part is located outside the primary support of the tunnel. The top of the embedded part is a rotatably connected annular part, and the connecting part is a rod-shaped structure, at least one end of which is just inserted into the annular part at the top of the embedded part along the axial direction of the tunnel, and the reinforced arch skeleton is fixedly connected to the multiple connecting pieces; Each steel arch frame is provided with a plurality of circumferentially spaced connecting parts. When the position where the steel arch frame is provided is far away from the embedded parts on both sides, the two ends of the connecting parts are respectively inserted into the ring parts on the top of the embedded parts on both sides to achieve positioning and fixing, and then the steel arch frame is fixed to the connecting parts by welding; when the position where the steel arch frame is provided is close to the embedded parts on one side, the positioning and fixing is achieved by inserting one end of the connecting parts into the ring part on the top of the embedded parts that are closer, and then the steel arch frame is fixed to the connecting parts by welding.

2. The long tunnel spray dust suppression system according to claim 1, characterized in that: The angle between the high-pressure atomizing nozzle and the tunnel axis is 45° to 60° in the direction of polluted air discharge.

3. The long tunnel spray dust suppression system according to claim 1, characterized in that: The front-end atomizing dust removal system is no more than 100m away from the tunnel face, and the full-section atomizing dust removal system is spaced 350m~400m apart.

4. The long tunnel spray dust suppression system according to claim 1, characterized in that: The connecting piece is a screw rod, on which a nut is provided in threaded cooperation, the outer periphery of the nut is a truncated cone, and the connecting piece is locked in the annular piece through the outer periphery of the nut.

5. A method for operating a spray dust suppression system for a long tunnel according to any one of claims 1 to 4, characterized in that: The steps include: Step 1: Install and lay out the corresponding long tunnel spray dust suppression system at the corresponding position in the tunnel according to the structure of the long tunnel spray dust suppression system; Step 2: During the tunnel construction process, the automatic air quality monitoring system of each tunnel transmits the real-time monitored tunnel air quality parameters to the intelligent control system in real time. The intelligent control system controls the atomization dust removal system in the corresponding section to perform atomization dust removal. When the air pollutant content in the tunnel exceeds the specified value, the intelligent control system sends an opening signal to the wireless control gate valve. At this time, high-pressure water and high-pressure wind are supplied to the high-pressure atomization nozzle, and the high-pressure atomization nozzle starts to spray dust reduction, so that the air quality in the tunnel meets the specified requirements; when the air pollutant content in the tunnel is lower than the specified value, the intelligent control system sends a closing signal to the wireless control gate valve. At this time, high-pressure water and high-pressure wind stop being supplied to the high-pressure atomization nozzle, and the high-pressure atomization nozzle stops spraying dust reduction.

6. The working method of the long tunnel spray dust suppression system according to claim 5, characterized in that: The specific control method of the intelligent control system is: First, the parameter acquisition module acquires the tunnel air quality parameters monitored by the tunnel air quality automatic monitoring system in real time and transmits them to the comparison module; Secondly, the comparison module compares the monitored tunnel air quality parameters with the air quality design parameters stored in the storage module, and sends the comparison results to the control module; Finally, the control module divides the comparison results into multiple groups through the result classification unit therein. The comparison results are divided into multiple step ranges according to the numerical values ​​to form multiple groups, and the multiple groups of results are compared to control the opening and closing of the wireless control gate valve and the opening of different gears accordingly.

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