Spiral tunnel dead angle ventilation and dust reduction device

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a spiral tunnel dead angle ventilation and dust fall device which comprises a ventilator, the ventilator is installed on a fixing frame, a first inserting pipe and a second inserting pipe are fixedly arranged on the annular face of the ventilator, and the outer end of the first inserting pipe is connected with an air outlet pipe of an arc-shaped structure in a sealed mode. Water storage pipes of an arc-shaped structure are arranged on the rear side of the air outlet pipe side by side and connected with the air outlet pipe through multiple sets of connecting pipes, spraying heads are installed at the ends, located in the air outlet pipe, of the connecting pipes in a sealed mode, and multiple sets of nozzles used for air outlet are evenly installed at the bottom of the annular face of the air outlet pipe. The outer end of the bent pipe is connected with a conical flow guide cover, and the outer side of the flow guide cover is fixedly connected with an air bellow. Fresh air is introduced through the ventilator, ventilation is conducted from the top and the bottom of the tunnel through the air outlet pipe and the air bellow respectively, air flow is effectively guided, and unsmooth air flow and dead angle areas possibly occurring in an original ventilation mode are avoided.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and more specifically, to a spiral tunnel dead-angle ventilation and dust reduction device. Background Technology

[0002] Due to their unique shape, spiral tunnels present different challenges in construction techniques, ventilation, and fire prevention compared to straight tunnels. Ventilation is particularly difficult; the curved shape of a spiral tunnel increases airflow resistance and losses, significantly complicating ventilation compared to a straight tunnel. Furthermore, the presence of toxic gases and dust pollutants in tunnels under construction creates a harsh occupational health environment during construction. Ventilation is the only effective method to ensure clean air within the tunnel and is crucial for the safety of workers.

[0003] Currently, post-blast ventilation in tunnels primarily relies on forced ventilation, a method that mechanically forces fresh air into underground chambers or mines to improve the working environment and protect the health of workers. This method utilizes ventilation machinery located outside the tunnel to deliver fresh air to the working face through ducts, while simultaneously expelling polluted air to the surface, thus diluting and removing harmful gases. However, under forced ventilation conditions, certain areas of the ventilation ducts, especially at the top and corners, experience poor airflow, leading to dust accumulation and significant dust retention. This makes it difficult to quickly and effectively reduce dust concentration inside the tunnel after blasting, limiting tunnel construction efficiency, endangering the occupational health of workers, and increasing the probability of construction accidents. Therefore, a device capable of ventilating and reducing dust in the dead zones of spiral tunnels is needed to address these issues. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a spiral tunnel dead-angle ventilation and dust suppression device, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A spiral tunnel dead-angle ventilation and dust suppression device includes a ventilation duct and a fixing frame. The ventilation duct is installed on the fixing frame, which is used to fix the ventilation duct to the inner wall of the tunnel. A first insertion pipe and a second insertion pipe are fixedly provided on the circumferential surface of the ventilation duct. An arc-shaped air outlet pipe is sealed to the outer end of the first insertion pipe. An arc-shaped water storage pipe is arranged in parallel on the rear side of the air outlet pipe. The water storage pipe is connected to the air outlet pipe through multiple sets of connecting pipes. A spray head is sealed to one end of the connecting pipe inside the air outlet pipe. Multiple sets of nozzles for air outlet are evenly installed at the bottom of the circumferential surface of the air outlet pipe. An obtuse-angled bend is sealed to the second insertion pipe. A conical guide shroud is connected to the outer end of the bend. An air box is fixedly connected to the outside of the guide shroud.

[0007] Furthermore, flanges for connecting external ventilation ducts are fixed at both the front and rear ends of the ventilation duct.

[0008] Furthermore, both the air outlet pipe and the water storage pipe are provided with arc-shaped support plates at their bottoms. The air outlet pipe and the water storage pipe are fixed to the support plates by hoops. Multiple sets of hanging rods for fixing are fixed at the front and rear edges of the upper surface of the support plate.

[0009] Furthermore, an external water pipe is connected to the upper side of the water storage pipe.

[0010] Furthermore, the fixing frame consists of a support plate, a base frame, and crossbars. The base frame is equipped with two sets of arc-shaped support plates for supporting the ventilation cylinder. Two sets of crossbars are horizontally arranged inside the base frame, and the right end of the crossbars is fixed to the inner wall of the tunnel by expansion bolts.

[0011] Furthermore, a side baffle for supporting the bellows is fixed on the left side of the base frame.

[0012] Furthermore, multiple sets of flow equalization plates are uniformly fixed inside the air box.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model introduces fresh air through a ventilation duct and ventilates from the top and bottom of the tunnel through an air outlet pipe and an air box, effectively guiding airflow and avoiding the poor airflow and dead zones that may occur in the original ventilation method.

[0015] 2. In this invention, a water storage pipe installed at the rear of the air outlet duct sprays water into the duct via a connecting pipe and a spray head, forming a water mist. The water mist combines with dust particles in the air and settles, effectively reducing the dust concentration in the air. This dust suppression method is both environmentally friendly and efficient, providing a healthier working environment for tunnel construction workers. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model from another angle.

[0018] Figure 3 This is a schematic diagram of the support plate in this utility model.

[0019] Figure 4 This is a schematic diagram of the bottom structure of the support plate in this utility model.

[0020] Figure 5 This is a partial cross-sectional view of the support plate in this utility model.

[0021] Figure 6 This is a schematic diagram of the ventilation duct in this utility model.

[0022] Figure 7 This is a schematic diagram of the ventilation duct from another angle in this utility model.

[0023] Figure 8 This is a schematic diagram of the structure of the fixing frame in this utility model.

[0024] In the diagram: 1. Support plate; 2. External water pipe; 3. Fixing frame; 31. Support plate; 32. Side baffle; 33. Base frame; 34. Crossbar; 4. Ventilation duct; 5. Air outlet duct; 6. Water storage pipe; 7. Hanging rod; 8. Nozzle; 9. Connecting pipe; 10. Spray head; 11. First insertion pipe; 12. Flange; 13. Air box; 14. Flow distribution plate; 15. Second insertion pipe; 16. Bend; 17. Flow guide. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0026] Example:

[0027] like Figures 1 to 8As shown, a spiral tunnel dead-angle ventilation and dust suppression device includes a ventilation duct 4 and a fixing frame 3. The ventilation duct 4 is installed on the fixing frame 3, which is used to fix the ventilation duct 4 to the inner wall of the tunnel. The ventilation duct 4 is used to connect to an external ventilation duct to introduce fresh air into the exhaust pipe 5. A first insertion pipe 11 and a second insertion pipe 15 are fixedly provided on the circumferential surface of the ventilation duct 4. The outer end of the first insertion pipe 11 is sealed and connected to an arc-shaped exhaust pipe 5. The exhaust pipe 5 is located near the top of the tunnel and is responsible for blowing the air in the ventilation duct 4 out from the top and distributing it evenly into the tunnel, thereby preventing the accumulation of polluted air at the top of the tunnel. An arc-shaped water storage pipe 6 is arranged in parallel behind the exhaust pipe 5. The water storage pipe 6 is connected to the exhaust pipe 5 through multiple sets of connecting pipes 9. A spray head 10 is sealed and installed at one end of the connecting pipe 9 inside the exhaust pipe 5. The spray head 10 sprays water into the exhaust pipe 5, forming a water mist through the wind pressure in the exhaust pipe 5, spraying water while ventilating. The mist, after combining with dust, causes it to settle, effectively reducing the dust concentration in the air. Multiple sets of nozzles 8 are evenly installed at the bottom of the circumferential surface of the air outlet duct 5 for air outlet. The nozzles 8 are used to blow fresh air out of the air outlet duct 5 to achieve ventilation. The second insertion pipe 15 is sealed with a bend 16 with an obtuse angle structure. The outer end of the bend 16 is connected to a conical guide shroud 17. An air box 13 is fixedly connected to the outside of the guide shroud 17. The air box 13 is located on the lower side of the air outlet duct 5, which can provide ventilation from near the bottom of the tunnel, helping to guide airflow and improve ventilation efficiency. This design solves the problem that under forced ventilation conditions, dust easily accumulates in certain areas of the ventilation duct, especially at the top and corners, due to poor airflow, resulting in obvious dust retention. This makes it difficult to quickly and effectively reduce the dust concentration in the tunnel after blasting. This not only limits the tunnel construction efficiency but also endangers the occupational health of construction workers and increases the probability of construction accidents.

[0028] In this embodiment, flanges 12 for connecting to external ventilation ducts are fixed at both the front and rear ends of the ventilation duct 4. As a standard connecting component, the flange 12 is designed to allow the ventilation duct 4 to be easily connected to the external ventilation duct. This connection method is not only simple and quick, but also ensures the stability and sealing of the connection.

[0029] In this embodiment, both the air outlet pipe 5 and the water storage pipe 6 are equipped with arc-shaped support plates 1 at their bottoms. The air outlet pipe 5 and the water storage pipe 6 are fixed to the support plates 1 by hoops. Multiple sets of hanging rods 7 are fixed to the front and rear edges of the upper surface of the support plate 1 for fixation. The arc-shaped support plate 1 can closely fit the bottom curves of the air outlet pipe 5 and the water storage pipe 6, providing uniform support force and effectively preventing the pipes from deforming or shifting due to their own weight or external forces. The use of hoops further strengthens the connection between the pipes and the support plate 1, ensuring the stability of the pipes. The hanging rods 7 can be easily connected to the tunnel ceiling, allowing the air outlet pipe 5 and the water storage pipe 6 to be securely suspended in the air without occupying ground space.

[0030] In this embodiment, an external water pipe 2 is connected to the upper side of the water storage pipe 6. The external water pipe 2 is used to connect to an external water pump, ensuring that the water storage pipe 6 can continuously and stably receive water.

[0031] In this embodiment, the fixing frame 3 consists of a support plate 31, a base frame 33, and crossbars 34. The base frame 33 has two sets of arc-shaped support plates 31 for supporting the ventilation duct 4. This design allows for a close fit to the outer surface of the ventilation duct 4, providing stable support. The arc-shaped structure increases the contact area between the support plates 31 and the ventilation duct 4, resulting in a more even distribution and effectively preventing displacement or deformation of the ventilation duct 4 due to external forces or its own weight. Two sets of crossbars 34 are transversely arranged inside the base frame 33, with the right end of each crossbar 34 fixed to the tunnel wall using expansion bolts. The fixing frame 3 thus supports and fixes the ventilation duct 4, securely connecting it to the tunnel wall.

[0032] In this embodiment, a side baffle 32 for supporting the bellows 13 is fixed on the left side of the base frame 33. The main function of the side baffle 32 is to support the bellows 13 and ensure its stability.

[0033] In this embodiment, multiple sets of flow equalization plates 14 are uniformly fixed inside the air box 13. The main function of the flow equalization plates 14 is to change the airflow velocity distribution and direction, so as to make the gas flow uniform, which helps to achieve uniform distribution of airflow in the dead corner area of ​​the tunnel and improve the ventilation and dust reduction effect.

[0034] The working principle of this spiral tunnel dead-angle ventilation and dust suppression device:

[0035] Install the fixing frame 3 on the inner wall of the tunnel's dead corner area, and secure the crossbar 34 with expansion bolts to ensure the stability of the fixing frame 3. Install the ventilation duct 4 on the support plate 31 of the fixing frame 3, and connect it to the external ventilation duct through the flange 12. Install components such as the air outlet pipe 5, water storage pipe 6, bend 16, guide shroud 17, and air box 13, ensuring reliable sealing between each component. Fix the support plate 1 to the tunnel roof wall through the hanger 7, and use the support plate 1 to support and fix the air outlet pipe 5 and water storage pipe 6. Connect the external water pipe 2 to the external water pump to deliver water to the water storage pipe 6. Start the fan of the external ventilation duct, and fresh air is introduced into the ventilation duct 4 through the ventilation duct. Fresh air enters the air outlet pipe 5 and air box 13 through the ventilation duct 4, and is blown out evenly from the top and bottom of the tunnel. Start the external water pump, and send water into the water storage pipe 6 through the external water pipe 2. Water enters the spray head 10 through the connecting pipe 9 and forms a water mist in the air outlet pipe 5. The air outlet pipe 5 sprays fresh air and water mist downward through the nozzle 8. The water mist combines with the dust in the air and settles, effectively reducing the dust concentration in the air.

[0036] In summary, this spiral tunnel dead-angle ventilation and dust suppression device can effectively solve the problem of dust accumulation during tunnel construction, improve ventilation efficiency, reduce dust concentration, and provide a safer and healthier working environment for construction workers.

[0037] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A spiral tunnel dead-angle ventilation and dust suppression device, comprising a ventilation duct (4) and a fixing frame (3), characterized in that: The ventilation duct (4) is installed on the fixing frame (3), which is used to fix the ventilation duct (4) to the inner wall of the tunnel. The ventilation duct (4) is fixedly provided with a first insertion pipe (11) and a second insertion pipe (15) on its circumferential surface. The outer end of the first insertion pipe (11) is sealed with an arc-shaped air outlet pipe (5). An arc-shaped water storage pipe (6) is arranged in parallel on the rear side of the air outlet pipe (5). The water storage pipe (6) is connected to the air outlet pipe (5) through multiple sets of connecting pipes (9). A spray head (10) is sealed at one end of the connecting pipe (9) inside the air outlet pipe (5). Multiple sets of nozzles (8) for air outlet are evenly installed at the bottom of the circumferential surface of the air outlet pipe (5). An obtuse-angled bent pipe (16) is sealed on the second insertion pipe (15). A conical guide shroud (17) is connected to the outer end of the bent pipe (16). A wind box (13) is fixedly connected to the outer side of the guide shroud (17).

2. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 1, characterized in that: The ventilation duct (4) is fixed with flanges (12) at both the front and rear ends for connecting external ventilation ducts.

3. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 1, characterized in that: The bottom of the air outlet pipe (5) and the water storage pipe (6) are provided with an arc-shaped support plate (1). The air outlet pipe (5) and the water storage pipe (6) are fixed to the support plate (1) by a hoop. Multiple sets of hanging rods (7) for fixing are fixed at the front and rear edges of the upper surface of the support plate (1).

4. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 1, characterized in that: An external water pipe (2) is connected to the upper side of the water storage pipe (6).

5. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 1, characterized in that: The fixing frame (3) consists of a support plate (31), a base frame (33) and a crossbar (34). The base frame (33) is provided with two sets of arc-shaped support plates (31) for supporting the ventilation cylinder (4). Two sets of crossbars (34) are horizontally arranged inside the base frame (33). The right end of the crossbar (34) is fixed to the inner wall of the tunnel by expansion bolts.

6. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 5, characterized in that: The base frame (33) is fixed with a side baffle (32) for supporting the bellows (13) on the left side.

7. The spiral tunnel dead-angle ventilation and dust suppression device according to claim 1, characterized in that: Multiple sets of flow equalization plates (14) are uniformly fixed inside the air box (13).

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